/* ══════════════════════════════════════════════════════════
   MEP Calculators v3 - DESIGN SYSTEM
══════════════════════════════════════════════════════════ */
:root{
  --blue:#0066FF;--blue-light:#3385FF;--blue-dark:#0047CC;--blue-dim:rgba(0,102,255,0.13);
  --navy:#0A0F2C;--navy-mid:#111936;--navy-card:#141B3A;--navy-border:#1E2B52;
  --muted:#8A9CC2;--text:#C8D4F0;
  --green:#00E676;--red:#FF3D57;--amber:#FFB300;--purple:#CE93D8;--teal:#00BCD4;
  --font:'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,'Helvetica Neue',Arial,sans-serif;--mono:'JetBrains Mono',monospace;
  --radius:14px;--radius-sm:8px;
  --shadow:0 8px 32px rgba(0,0,0,0.4);--glow:0 0 24px rgba(0,102,255,0.3);
  --tr:0.22s cubic-bezier(0.4,0,0.2,1);
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--font);background:var(--navy);color:var(--text);min-height:100vh;overflow-x:hidden}
button,input,select,textarea{font-family:var(--font)}
a{color:inherit;text-decoration:none}
::-webkit-scrollbar{width:5px;height:5px}
::-webkit-scrollbar-track{background:var(--navy-mid)}
::-webkit-scrollbar-thumb{background:var(--navy-border);border-radius:3px}
::-webkit-scrollbar-thumb:hover{background:var(--blue)}

/* ── NAV ── */
#nav{position:fixed;top:0;left:0;right:0;z-index:1000;background:rgba(10,15,44,0.96);
  backdrop-filter:blur(20px);border-bottom:1px solid var(--navy-border);
  display:flex;align-items:center;gap:12px;padding:0 22px;height:60px}
.logo{display:flex;align-items:center;gap:10px;flex-shrink:0;cursor:pointer}
.logo-icon{width:34px;height:34px;background:var(--blue);border-radius:9px;display:grid;
  place-items:center;font-size:16px;font-weight:700;color:#fff;box-shadow:var(--glow)}
.logo-text{display:flex;flex-direction:column;line-height:1}
.logo-name{font-size:17px;font-weight:700;color:#fff;letter-spacing:-0.5px}
.logo-tag{font-size:10px;color:var(--muted)}
.nav-badge{background:var(--blue-dim);border:1px solid var(--blue);color:var(--blue);
  font-size:10px;font-weight:700;padding:3px 8px;border-radius:20px;flex-shrink:0;white-space:nowrap}
.nav-spacer{flex:1}
#search-bar{display:flex;align-items:center;gap:8px;background:var(--navy-card);
  border:1px solid var(--navy-border);border-radius:10px;padding:0 12px;height:36px;
  width:230px;max-width:100%;
  transition:width 0.32s cubic-bezier(0.4,0,0.2,1),border-color 0.2s,box-shadow 0.2s;
  position:relative;z-index:200}
#search-bar:focus-within{width:480px;border-color:var(--blue);box-shadow:0 0 0 3px var(--blue-dim)}
#search-bar:focus-within svg{color:var(--blue)}
#search-bar svg{width:14px;height:14px;color:var(--muted);flex-shrink:0;transition:color 0.2s}
#search-input{background:none;border:none;outline:none;color:#fff;font-size:13px;width:100%;font-family:var(--font)}
#search-input::placeholder{color:var(--muted)}
#search-kbd{flex-shrink:0;font-size:9px;color:var(--muted);background:var(--navy-border);
  border-radius:4px;padding:2px 5px;font-family:var(--mono);white-space:nowrap;transition:opacity 0.2s}
#search-bar:focus-within #search-kbd{opacity:0;pointer-events:none}
#search-clear{display:none;width:18px;height:18px;border-radius:50%;background:var(--navy-border);
  border:none;color:var(--muted);cursor:pointer;font-size:11px;flex-shrink:0;
  align-items:center;justify-content:center;transition:0.2s;font-family:var(--font)}
#search-bar.has-value #search-clear{display:flex}
#search-clear:hover{background:var(--red);color:#fff}
@media(max-width:960px){
  #search-bar{width:140px}
  #search-bar:focus-within{width:200px}
  #search-kbd{display:none}
}
@media(max-width:580px){
  #search-bar{width:110px}
  #search-bar:focus-within{width:160px}
}
.unit-toggle{display:flex;background:var(--navy-card);border:1px solid var(--navy-border);border-radius:8px;overflow:hidden;flex-shrink:0}
.unit-btn{padding:5px 10px;font-size:11px;font-weight:600;cursor:pointer;border:none;background:none;color:var(--muted);transition:var(--tr)}
.unit-btn.active{background:var(--blue);color:#fff}
/* Hamburger */
#ham-btn{display:none;width:34px;height:34px;border-radius:8px;border:1px solid var(--navy-border);
  background:none;color:var(--muted);cursor:pointer;place-items:center;flex-direction:column;
  gap:4px;padding:8px;transition:var(--tr)}
#ham-btn.open{color:var(--blue);border-color:var(--blue)}
#ham-btn span{display:block;width:16px;height:2px;background:currentColor;border-radius:1px;transition:var(--tr)}

/* ── LAYOUT ── */
#app{padding-top:60px;display:flex;min-height:100vh;max-width:1320px;margin:0 auto;width:100%;box-sizing:border-box}
#sidebar{width:212px;flex-shrink:0;background:var(--navy-mid);border-right:1px solid var(--navy-border);
  padding:16px 0;position:sticky;top:60px;height:calc(100vh - 60px);overflow-y:auto;
  display:flex;flex-direction:column;gap:1px;transition:var(--tr)}
#main{flex:1;padding:20px 22px;min-width:0}

/* ── AD PLACEHOLDERS ── */
.ad-placeholder{background:var(--navy-card);border:1px dashed var(--navy-border);border-radius:var(--radius-sm);
  display:flex;align-items:center;justify-content:center;color:var(--muted);font-size:10px;letter-spacing:1px;text-transform:uppercase}
.ad-sidebar{width:calc(100% - 20px);height:75px;margin:10px 10px}
.ad-inline{width:100%;height:70px;margin:14px 0}

/* ── SIDEBAR ── */
.side-label{font-size:10px;font-weight:600;letter-spacing:1.5px;text-transform:uppercase;
  color:var(--muted);padding:8px 16px 3px}
.cat-btn{display:flex;align-items:center;gap:8px;padding:8px 16px;cursor:pointer;border:none;
  background:none;color:var(--muted);font-size:12.5px;font-weight:500;width:100%;text-align:left;
  transition:var(--tr);border-left:3px solid transparent}
.cat-btn:hover{color:#fff;background:var(--navy-card)}
.cat-btn.active{color:var(--blue);background:var(--blue-dim);border-left-color:var(--blue)}
.cat-dot{width:7px;height:7px;border-radius:50%;flex-shrink:0}
.cat-count{margin-left:auto;font-size:10px;background:var(--navy-border);border-radius:20px;padding:1px 6px;min-width:22px;text-align:center}
.fav-section{padding:8px 0 0;border-top:1px solid var(--navy-border);margin-top:4px}
.recent-section{padding:8px 0 0;border-top:1px solid var(--navy-border)}
.recent-item,.fav-item{display:flex;align-items:center;gap:7px;padding:5px 16px;cursor:pointer;
  font-size:11px;color:var(--muted);transition:var(--tr);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.recent-item:hover,.fav-item:hover{color:#fff}
.r-dot{width:5px;height:5px;background:var(--blue);border-radius:50%;flex-shrink:0}
.fav-dot{width:5px;height:5px;background:var(--amber);border-radius:50%;flex-shrink:0}

/* ── MOBILE PILLS ── */
#cat-pills{display:none;gap:7px;overflow-x:auto;padding:0 0 10px;scrollbar-width:none;flex-wrap:nowrap}
#cat-pills::-webkit-scrollbar{display:none}
.pill-btn{flex-shrink:0;padding:6px 13px;border-radius:20px;font-size:11px;font-weight:600;
  border:1px solid var(--navy-border);background:var(--navy-card);color:var(--muted);cursor:pointer;transition:var(--tr)}
.pill-btn.active{background:var(--blue);border-color:var(--blue);color:#fff}

/* ── SECTION HEADER ── */
.section-header{margin-bottom:0}
.section-head-row{display:flex;justify-content:space-between;align-items:flex-start;gap:16px;flex-wrap:wrap;margin-bottom:16px}
.results-indemand{font-size:12px;font-weight:800;letter-spacing:1px;text-transform:uppercase;color:var(--blue);display:flex;align-items:center;gap:6px}
.section-header h2{font-size:20px;font-weight:700;color:#fff;letter-spacing:-0.5px}
.section-header p{font-size:12px;color:var(--muted);margin-top:3px}
.results-meta{display:flex;flex-direction:column;align-items:flex-end;gap:4px;text-align:right;flex-shrink:0;padding-top:2px}
.results-count{font-size:11px;color:var(--muted)}
.results-meta{display:none!important}
.grid-sec{display:none!important}
.toggle-switch{position:relative;width:32px;height:17px}
.toggle-switch input{opacity:0;width:0;height:0}
.toggle-slider{position:absolute;inset:0;background:var(--navy-border);border-radius:10px;cursor:pointer;transition:var(--tr)}
.toggle-slider:before{content:'';position:absolute;width:11px;height:11px;left:3px;top:3px;
  background:#fff;border-radius:50%;transition:var(--tr)}
.toggle-switch input:checked+.toggle-slider{background:var(--blue)}
.toggle-switch input:checked+.toggle-slider:before{transform:translateX(15px)}

/* ── CARDS GRID ── */
#cards-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(268px,1fr));gap:13px}
.grid-sec{grid-column:1/-1;display:flex;align-items:center;gap:8px;font-size:12px;font-weight:800;letter-spacing:1px;text-transform:uppercase;color:var(--muted);padding:12px 2px 0;margin-top:8px;border-top:1px solid var(--navy-border)}
.grid-sec-top{color:var(--blue);border-top:none;margin-top:0;padding:2px 2px 0}
.calc-card{background:var(--navy-card);border:1px solid var(--navy-border);border-radius:var(--radius);
  padding:17px;cursor:pointer;transition:var(--tr);position:relative;overflow:hidden;
  opacity:0;transform:translateY(12px);animation:cardIn 0.38s forwards}
.calc-card::before{content:'';position:absolute;top:0;left:0;right:0;height:2px;
  background:var(--card-accent,var(--blue));opacity:0;transition:var(--tr)}
.calc-card:hover{border-color:var(--blue);transform:translateY(-2px);box-shadow:var(--shadow)}
.calc-card:hover::before{opacity:1}
@keyframes cardIn{to{opacity:1;transform:translateY(0)}}
.card-top{display:flex;align-items:flex-start;justify-content:space-between;margin-bottom:9px}
.card-header{display:flex;align-items:flex-start;gap:10px;flex:1}
.card-icon{width:38px;height:38px;border-radius:9px;display:grid;place-items:center;font-size:18px;flex-shrink:0;background:var(--card-bg,var(--blue-dim))}
.card-meta{flex:1}
.card-cat{font-size:10px;font-weight:600;letter-spacing:1px;text-transform:uppercase;color:var(--card-color,var(--blue));margin-bottom:2px}
.card-name{font-size:14px;font-weight:700;color:#fff;line-height:1.2}
/* Favorite star */
.fav-star{width:26px;height:26px;border:none;background:none;cursor:pointer;font-size:16px;
  color:var(--navy-border);transition:var(--tr);flex-shrink:0;line-height:1;display:grid;place-items:center;border-radius:6px}
.fav-star:hover{color:var(--amber)}
.fav-star.active{color:var(--amber)}
/* Usage counter */
.card-usage{font-size:10px;color:var(--muted);margin-bottom:7px}
.card-desc{font-size:11.5px;color:var(--muted);line-height:1.5;margin-bottom:10px}
.card-tags{display:flex;flex-wrap:wrap;gap:4px;margin-bottom:11px}
.tag{font-size:10px;padding:2px 7px;border-radius:4px;background:var(--navy-mid);border:1px solid var(--navy-border);color:var(--muted);font-weight:500}
.calc-btn{width:100%;padding:9px;border-radius:var(--radius-sm);border:none;background:var(--blue);
  color:#fff;font-size:12.5px;font-weight:600;cursor:pointer;transition:var(--tr);
  display:flex;align-items:center;justify-content:center;gap:5px}
.calc-btn:hover{background:var(--blue-light);box-shadow:var(--glow)}
.calc-btn svg{width:13px;height:13px}

/* ── MODAL ── MEPQD-RESTYLE */
#modal-overlay{display:none;position:fixed;inset:0;z-index:2000;
  background:rgba(5,8,20,0.9);backdrop-filter:blur(12px);
  align-items:flex-start;justify-content:center;padding:16px;overflow-y:auto}
#modal-overlay.open{display:flex}
#modal{background:var(--navy-mid);border:1px solid var(--navy-border);border-radius:18px;max-width:1380px;width:96%;
  width:100%;max-width:1020px;margin:auto;overflow:hidden;
  box-shadow:0 32px 80px rgba(0,0,0,0.7);
  animation:modalIn 0.26s cubic-bezier(0.34,1.56,0.64,1)}
@keyframes modalIn{from{opacity:0;transform:scale(0.93) translateY(14px)}to{opacity:1;transform:scale(1)}}

/* header band */
.modal-header{display:flex;align-items:center;gap:12px;padding:16px 20px;
  background:linear-gradient(135deg,rgba(0,102,255,0.18),rgba(0,102,255,0.04));
  border-bottom:1px solid var(--navy-border)}
.modal-icon{width:38px;height:38px;border-radius:10px;display:grid;place-items:center;
  font-size:19px;flex-shrink:0;background:var(--blue-dim);border:1px solid rgba(0,102,255,0.32)}
.modal-title-wrap{flex:1;min-width:0}
.modal-title{font-size:16.5px;font-weight:700;color:#fff;letter-spacing:-0.2px;line-height:1.25}
.modal-ref{font-size:11px;color:var(--muted);margin-top:3px}
.modal-actions{display:flex;gap:6px;align-items:center}
.icon-btn{width:31px;height:31px;border-radius:8px;border:1px solid var(--navy-border);background:none;
  color:var(--muted);cursor:pointer;display:grid;place-items:center;transition:var(--tr)}
.icon-btn:hover{color:#fff;border-color:var(--blue);background:var(--blue-dim)}
.icon-btn svg{width:13px;height:13px}
.pdf-btn{display:flex;align-items:center;gap:5px;padding:6px 11px;border-radius:8px;
  border:1px solid var(--blue);background:var(--blue-dim);color:var(--blue);
  font-size:11px;font-weight:600;cursor:pointer;transition:var(--tr);white-space:nowrap}
.pdf-btn:hover{background:var(--blue);color:#fff}
.pdf-btn svg{width:12px;height:12px}
.close-btn{width:30px;height:30px;border-radius:8px;border:none;background:none;color:var(--muted);
  cursor:pointer;display:grid;place-items:center;transition:var(--tr);font-size:17px}
.close-btn:hover{color:var(--red);background:rgba(255,61,87,0.1)}

/* description strip + category pill */
.modal-desc{display:flex;align-items:center;gap:14px;padding:11px 20px;
  background:var(--blue-dim);border-bottom:1px solid var(--navy-border);
  font-size:12.5px;color:var(--text);line-height:1.55}
.modal-desc.hide{display:none}
.modal-desc-text{flex:1;min-width:0}
.modal-cat-pill{display:inline-flex;align-items:center;gap:5px;padding:5px 12px;border-radius:20px;
  font-size:10px;font-weight:700;letter-spacing:0.7px;text-transform:uppercase;flex-shrink:0;
  background:rgba(0,102,255,0.2);color:var(--blue-light);
  border:1px solid rgba(0,102,255,0.4);white-space:nowrap}
.modal-cat-pill.hide{display:none}

/* body: two cards on a recessed surface */
.modal-body{display:flex;gap:16px;padding:16px;align-items:flex-start;
  min-height:0;background:var(--navy)}
.modal-inputs{flex:1;min-width:0;padding:16px 18px;overflow-y:auto;max-height:70vh;
  background:var(--navy-mid);border:1px solid var(--navy-border);border-radius:12px}
.modal-results{width:352px;flex-shrink:0;padding:16px;overflow-y:auto;max-height:70vh;
  background:var(--navy-mid);border:1px solid var(--navy-border);border-radius:12px;
  display:flex;flex-direction:column;gap:9px}

/* panel label */
.panel-label{display:flex;align-items:center;gap:8px;font-size:10.5px;font-weight:700;
  letter-spacing:1.4px;text-transform:uppercase;color:var(--muted);
  margin-bottom:13px;padding-bottom:10px;border-bottom:1px solid var(--navy-border)}
.panel-label::before{content:'';width:3px;height:13px;border-radius:2px;background:var(--blue)}

/* ── INPUTS ── */
.input-group{margin-bottom:14px}
.input-label{display:flex;align-items:center;justify-content:space-between;gap:8px;
  font-size:11.5px;font-weight:600;color:var(--text);margin-bottom:6px}
.unit-badge{font-family:var(--mono);font-size:10px;font-weight:600;color:var(--blue-light);
  background:var(--blue-dim);border:1px solid rgba(0,102,255,0.28);
  padding:2px 7px;border-radius:5px;flex-shrink:0;white-space:nowrap}
.inp{width:100%;background:var(--navy-card);border:1px solid var(--navy-border);
  border-radius:9px;padding:10px 12px;color:#fff;font-size:13.5px;
  font-family:inherit;outline:none;transition:var(--tr)}
.inp::placeholder{color:#5A6B94;font-style:italic}
.inp:hover{border-color:#2A3A66}
.inp:focus{border-color:var(--blue);box-shadow:0 0 0 3px var(--blue-dim);background:var(--navy)}
.inp.err{border-color:var(--red);box-shadow:0 0 0 3px rgba(255,61,87,0.15)}
.err-msg{font-size:10px;color:var(--red);margin-top:4px;display:none}
.err-msg.show{display:block}
select.inp option{background:var(--navy-card)}
.inp-row{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.inp-row-3{display:grid;grid-template-columns:1fr 1fr 1fr;gap:12px}
.section-div{font-size:10px;font-weight:700;color:var(--blue-light);letter-spacing:1.2px;
  text-transform:uppercase;margin:18px 0 10px;padding-bottom:6px;border-bottom:1px solid var(--navy-border)}

/* segmented pill toggle (replaces short selects) */
.seg-host{display:none!important}
.seg-group{display:flex;flex-wrap:wrap;gap:6px}
.seg-btn{flex:1 1 auto;min-width:70px;padding:9px 12px;border-radius:8px;
  border:1px solid var(--navy-border);background:var(--navy-card);color:var(--muted);
  font-family:inherit;font-size:12px;font-weight:600;cursor:pointer;
  transition:var(--tr);white-space:nowrap;text-align:center}
.seg-btn:hover{color:#fff;border-color:rgba(0,102,255,0.5)}
.seg-btn.active{background:var(--blue-dim);border-color:var(--blue);color:var(--blue-light)}

/* full-width calculate button */
.calc-run-btn{display:flex;align-items:center;justify-content:center;gap:9px;width:100%;
  margin-top:18px;padding:14px 18px;border:none;border-radius:11px;cursor:pointer;
  background:linear-gradient(135deg,var(--blue),var(--blue-dark));color:#fff;
  font-family:inherit;font-size:14px;font-weight:700;letter-spacing:0.2px;
  transition:var(--tr);box-shadow:0 6px 20px rgba(0,102,255,0.28)}
.calc-run-btn:hover{transform:translateY(-1px);box-shadow:0 10px 26px rgba(0,102,255,0.42)}
.calc-run-btn:active{transform:translateY(0)}

/* ── RESULTS ── */
.results-empty{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;
  gap:13px;padding:34px 20px;text-align:center;min-height:210px;
  border:1px dashed var(--navy-border);border-radius:11px}
.results-empty svg{width:42px;height:42px;color:var(--navy-border);stroke-width:1.5}
.results-empty p{font-size:12.5px;color:var(--muted);line-height:1.65;margin:0}
.results-empty b{color:var(--text);font-weight:600}
.result-card{background:var(--navy-card);border:1px solid var(--navy-border);
  border-radius:10px;padding:12px 14px}
.result-label{font-size:10px;font-weight:700;letter-spacing:1px;text-transform:uppercase;
  color:var(--muted);margin-bottom:4px}
.result-value{font-size:22px;font-weight:700;color:#fff;font-family:var(--mono);line-height:1.05}
.result-unit{font-size:10.5px;color:var(--muted);margin-top:3px}
.result-imperial{font-size:10px;color:var(--teal);margin-top:2px;display:none}
.result-imperial.show{display:block}
.result-badge{display:inline-flex;align-items:center;gap:4px;padding:3px 9px;border-radius:6px;
  font-size:10.5px;font-weight:700;margin-top:6px}
.badge-pass{background:rgba(0,230,118,0.15);color:var(--green);border:1px solid rgba(0,230,118,0.3)}
.badge-fail{background:rgba(255,61,87,0.15);color:var(--red);border:1px solid rgba(255,61,87,0.3)}
.badge-warn{background:rgba(255,179,0,0.15);color:var(--amber);border:1px solid rgba(255,179,0,0.3)}
.badge-info{background:var(--blue-dim);color:var(--blue);border:1px solid rgba(0,102,255,0.3)}
.formula-box{background:rgba(0,0,0,0.3);border:1px solid var(--navy-border);border-radius:10px;
  padding:12px 14px;font-family:var(--mono);font-size:11px;color:var(--muted);line-height:1.7}
.formula-box strong{color:var(--blue-light);font-family:var(--font);font-size:11.5px}
.formula-box .f-eq{color:#fff;font-size:11.5px;display:block;margin:4px 0}
.formula-box .f-step{color:var(--text);display:block}
/* ── DYNAMIC ROWS ── */
.load-header{display:grid;grid-template-columns:1.4fr 55px 45px 50px 78px 26px;gap:5px;
  font-size:10px;color:var(--muted);padding:0 0 3px;font-weight:600;text-transform:uppercase}
.load-row{display:grid;grid-template-columns:1.4fr 55px 45px 50px 78px 26px;gap:5px;align-items:center;margin-bottom:5px}
.load-row input,.load-row select{font-size:11px;padding:5px 7px}
.remove-row{width:24px;height:24px;border-radius:5px;border:1px solid var(--navy-border);
  background:none;color:var(--muted);cursor:pointer;display:grid;place-items:center;font-size:14px;transition:var(--tr)}
.remove-row:hover{color:var(--red);border-color:var(--red)}
.add-row-btn{display:flex;align-items:center;gap:5px;padding:7px 12px;background:var(--blue-dim);
  border:1px dashed var(--blue);border-radius:var(--radius-sm);color:var(--blue);font-size:11.5px;
  font-weight:600;cursor:pointer;transition:var(--tr);margin-top:4px;width:100%;justify-content:center}
.add-row-btn:hover{background:rgba(0,102,255,0.2)}

/* ── HOW TO USE ── */
.how-btn{display:flex;align-items:center;gap:5px;font-size:11px;color:var(--muted);
  background:none;border:none;cursor:pointer;padding:3px 0;margin-bottom:9px;transition:var(--tr)}
.how-btn:hover{color:var(--blue)}
.how-panel{display:none;background:var(--blue-dim);border:1px solid rgba(0,102,255,0.3);
  border-radius:var(--radius-sm);padding:9px 12px;font-size:11.5px;color:var(--text);line-height:1.6;margin-bottom:11px}
.how-panel.show{display:block}

/* ── TOAST ── */
#toast{position:fixed;bottom:82px;right:22px;z-index:9999;background:var(--navy-card);
  border:1px solid var(--navy-border);border-radius:10px;padding:10px 15px;
  font-size:12.5px;color:#fff;transform:translateY(16px);opacity:0;
  transition:all 0.28s;pointer-events:none;max-width:250px;box-shadow:var(--shadow)}
#toast.show{transform:translateY(0);opacity:1}
#toast.success{border-color:var(--green);color:var(--green)}
#toast.error{border-color:var(--red);color:var(--red)}
#toast.warn{border-color:var(--amber);color:var(--amber)}

/* ── BACK TO TOP ── */
#back-top{position:fixed;bottom:82px;left:22px;z-index:900;width:40px;height:40px;
  border-radius:50%;background:var(--navy-card);border:1px solid var(--navy-border);
  color:var(--muted);cursor:pointer;display:grid;place-items:center;
  transition:var(--tr);opacity:0;pointer-events:none;box-shadow:var(--shadow)}
#back-top.show{opacity:1;pointer-events:all}
#back-top:hover{color:#fff;border-color:var(--blue);background:var(--blue)}
#back-top svg{width:16px;height:16px}

/* ── WA BUTTON ── */
#wa-btn{position:fixed;bottom:24px;right:22px;z-index:900;width:48px;height:48px;
  border-radius:50%;background:#25D366;display:grid;place-items:center;cursor:pointer;
  box-shadow:0 4px 20px rgba(37,211,102,0.4);transition:var(--tr);border:none}
#wa-btn:hover{transform:scale(1.1);box-shadow:0 6px 28px rgba(37,211,102,0.6)}
#wa-btn svg{width:23px;height:23px;fill:#fff}

/* ── CAT COLORS ── */
.cat-hvac{--card-accent:#00BCD4;--card-color:#00BCD4;--card-bg:rgba(0,188,212,0.1)}
.cat-elec{--card-accent:#FFB300;--card-color:#FFB300;--card-bg:rgba(255,179,0,0.1)}
.cat-plumb{--card-accent:#00E676;--card-color:#00E676;--card-bg:rgba(0,230,118,0.1)}
.cat-fire{--card-accent:#FF3D57;--card-color:#FF3D57;--card-bg:rgba(255,61,87,0.1)}
.cat-gas{--card-accent:#FF7043;--card-color:#FF7043;--card-bg:rgba(255,112,67,0.1)}
.cat-air{--card-accent:#CE93D8;--card-color:#CE93D8;--card-bg:rgba(206,147,216,0.1)}
.cat-mech{--card-accent:#80DEEA;--card-color:#80DEEA;--card-bg:rgba(128,222,234,0.1)}

/* ── ANIMATIONS ── */
@keyframes pulse{0%{opacity:0.5;transform:scale(0.98)}100%{opacity:1;transform:scale(1)}}
.pulse{animation:pulse 0.22s ease}

/* ── MOBILE SIDEBAR ── */
#mobile-backdrop{display:none;position:fixed;inset:0;z-index:998;background:rgba(0,0,0,0.6);backdrop-filter:blur(4px)}
.sb-mob-only{display:none}
@media(max-width:960px){
  .sb-mob-only{display:block}
  .sb-mob-auth{padding:12px 12px 8px;border-bottom:1px solid var(--navy-border)}
  .sb-mob-user{display:flex;align-items:center;gap:9px;padding:10px 12px;background:var(--navy-card);border:1px solid var(--navy-border);border-radius:10px;margin-bottom:6px}
  .sb-mob-nav{padding:4px 0 8px;border-bottom:1px solid var(--navy-border)}
  .sb-nav-link{display:flex;align-items:center;gap:9px;padding:9px 16px;color:var(--muted);font-size:12.5px;font-weight:500;text-decoration:none;transition:var(--tr);border-left:3px solid transparent}
  .sb-nav-link:hover{color:#fff;background:var(--navy-card)}
  .sb-nav-link.active{color:var(--blue);background:var(--blue-dim);border-left-color:var(--blue)}
  .sb-nav-link svg{width:14px;height:14px;flex-shrink:0;opacity:.75}
  .sb-auth-login{display:block;text-align:center;padding:8px;border-radius:8px;border:1px solid var(--navy-border);color:var(--muted);font-size:12px;font-weight:500;text-decoration:none;transition:var(--tr);margin-bottom:6px}
  .sb-auth-login:hover{border-color:var(--blue);color:#fff;background:var(--blue-dim)}
  .sb-auth-signup{display:block;text-align:center;padding:8px;border-radius:8px;background:var(--blue);color:#fff;font-size:12px;font-weight:600;text-decoration:none;transition:var(--tr)}
  .sb-auth-signup:hover{background:var(--blue-light)}
}


/* ── RESPONSIVE ── */
@media(max-width:960px){
  /* ── Top nav: clean & minimal ── */
  #nav{gap:10px;padding:0 14px;height:54px}
  #app{padding-top:54px}
  #sidebar{position:fixed;top:54px;left:-212px;z-index:999;height:calc(100vh - 54px);transition:var(--tr)}
  #sidebar.mobile-open{left:0}
  #mobile-backdrop.show{display:block}
  #cat-pills{display:flex}
  #main{padding:14px}
  .modal-body{flex-direction:column}
  .modal-inputs{max-height:none;width:100%}
  .modal-results{width:100%;max-height:none}
  .modal-body{padding:12px;gap:12px}
  #modal-inputs .related-section{display:none}
  .modal-related{display:block;padding:14px 16px 16px}
  .modal-related .related-section{margin-top:0;padding-top:0;border-top:none}
  .logo-tag{display:none}
  #ham-btn{display:grid}
  .nav-badge{display:none}
  .nav-auth{display:none}
  .nav-user-menu{display:none}
  #search-bar{display:none}
  .unit-toggle{display:flex;border-radius:20px;overflow:hidden}
  .unit-btn{padding:4px 10px;font-size:11px}
  .lang-code{display:none}
  .lang-btn{padding:4px 7px;gap:0;border-color:transparent;background:transparent}
  .lang-btn svg{display:none}
}
@media(max-width:580px){
  #nav{padding:0 12px;gap:8px}
  #cards-grid{grid-template-columns:1fr}
  .inp-row,.inp-row-3{grid-template-columns:1fr}
  .load-header,.load-row{grid-template-columns:1fr 50px 40px 46px 70px 24px}
  .pdf-btn span{display:none}
  .hide-sm{display:none}
  .modal-header{padding:12px 14px}
  .modal-inputs{padding:14px 15px}
  .modal-body{padding:10px;gap:10px}
  .seg-btn{min-width:60px;padding:8px 10px;font-size:11.5px}
  .calc-run-btn{padding:13px 16px;font-size:13px}
  .modal-actions{gap:4px}
  .save-calc-btn,.share-wa-btn,.quick-print-btn{padding:5px 7px;gap:0}
  .logo-name{font-size:15px}
  .unit-btn{padding:4px 8px;font-size:10px}
}
/* Defaults */
.btn-nav-register .reg-short{display:none}
.btn-nav-register .reg-text{display:inline}
/* Mobile search icon button */
#mobile-search-btn{
  display:none;width:34px;height:34px;border-radius:8px;
  border:1px solid var(--navy-border);background:none;color:var(--muted);
  cursor:pointer;place-items:center;flex-shrink:0;transition:var(--tr)
}
#mobile-search-btn:hover,#mobile-search-btn.active{color:#fff;border-color:var(--blue);background:var(--blue-dim)}
#mobile-search-btn svg{width:16px;height:16px}
/* Mobile search overlay */
#mobile-search-overlay{
  display:none;position:fixed;top:54px;left:0;right:0;z-index:1005;
  background:rgba(10,15,44,0.98);backdrop-filter:blur(20px);
  border-bottom:1px solid var(--navy-border);
  padding:12px 14px;
}
#mobile-search-overlay.open{display:block}
#mobile-search-overlay #mob-search-input{
  width:100%;background:var(--navy-card);border:1px solid var(--navy-border);
  border-radius:10px;padding:10px 14px 10px 38px;color:#fff;font-size:14px;
  font-family:var(--font);outline:none;
}
#mobile-search-overlay #mob-search-input:focus{border-color:var(--blue);box-shadow:0 0 0 3px var(--blue-dim)}
#mobile-search-overlay #mob-search-input::placeholder{color:var(--muted)}
.mob-search-icon{position:absolute;top:50%;left:26px;transform:translateY(-50%);
  width:16px;height:16px;color:var(--muted);pointer-events:none}
body.light-mode #mobile-search-overlay{background:rgba(240,244,255,0.98)}
body.light-mode #mob-search-input{background:#fff;color:var(--text);border-color:var(--navy-border)}
/* ══════════════════════════════════════
   V6 FEATURES - CSS
══════════════════════════════════════ */


/* ── DASHBOARD MINIMIZE ── */


/* ── LIGHT MODE ── */
body.light-mode{
  --navy:#F0F4FF;--navy-mid:#E4EAF8;--navy-card:#FFFFFF;--navy-border:#C8D3E8;
  --text:#0F1929;--muted:#4A5A7A;--blue-dim:rgba(0,102,255,0.08);
  background:var(--navy);color:var(--text)
}
body.light-mode #nav{background:rgba(240,244,255,0.97);border-bottom-color:var(--navy-border)}
body.light-mode .logo-name{color:var(--text)}
body.light-mode .logo-tag{color:var(--muted)}
body.light-mode #search-bar{background:#fff;border-color:var(--navy-border)}
body.light-mode #search-input{color:var(--text)}
body.light-mode #search-input::placeholder{color:var(--muted)}
body.light-mode #search-kbd{background:var(--navy-border);color:var(--muted)}
body.light-mode #global-search-results{background:#fff;border-color:var(--navy-border);box-shadow:0 24px 64px rgba(0,0,0,0.12)}
body.light-mode .gsr-item:hover,.gsr-item.focused{background:#F4F7FF}
body.light-mode .gsr-item-name{color:var(--text)}
body.light-mode .gsr-item-type{background:var(--navy-border)}
body.light-mode .gsr-footer{border-top-color:var(--navy-border)}
body.light-mode .home-bottom-seo{background:#fff;border-color:var(--navy-border);box-shadow:0 2px 12px rgba(0,0,0,0.06)}
body.light-mode .calc-card{background:#fff;box-shadow:0 2px 12px rgba(0,0,0,0.07);border-color:var(--navy-border)}
body.light-mode .calc-card:hover{box-shadow:0 6px 24px rgba(0,102,255,0.12)}
body.light-mode .card-name{color:var(--text)}
body.light-mode .card-desc{color:var(--muted)}
body.light-mode .card-usage{color:var(--muted)}
body.light-mode .tag{color:var(--muted);background:#F0F4FF;border-color:var(--navy-border)}
body.light-mode .section-header h2{color:var(--text)}
body.light-mode .section-header p{color:var(--muted)}
body.light-mode .results-count{color:var(--muted)}
body.light-mode #sidebar{background:var(--navy-mid)}
body.light-mode .cat-btn{color:var(--muted)}
body.light-mode .cat-btn:hover{color:var(--text);background:var(--navy-card)}
body.light-mode .cat-btn.active{color:var(--blue);background:var(--blue-dim)}
body.light-mode .side-label{color:var(--muted)}
body.light-mode .recent-item,.body.light-mode .fav-item{color:var(--muted)}
body.light-mode .recent-item:hover,body.light-mode .fav-item:hover{color:var(--text)}
body.light-mode .pill-btn{background:#fff;color:var(--muted);border-color:var(--navy-border)}
body.light-mode .pill-btn.active{background:var(--blue);color:#fff}
body.light-mode #modal{background:#fff}
body.light-mode .modal-header{background:#fff;border-color:var(--navy-border)}
body.light-mode .modal-title{color:var(--text)}
body.light-mode .modal-ref{color:var(--muted)}
body.light-mode .modal-inputs{background:#fff}
body.light-mode .modal-results{background:#F4F7FF}
body.light-mode .icon-btn{color:var(--muted);border-color:var(--navy-border)}
body.light-mode .icon-btn:hover{color:var(--text)}
body.light-mode .close-btn{color:var(--muted)}
body.light-mode .inp{background:#F4F7FF;color:var(--text);border-color:var(--navy-border)}
body.light-mode .inp:focus{border-color:var(--blue)}
body.light-mode .input-label{color:var(--muted)}
body.light-mode select.inp option{background:#fff;color:var(--text)}
body.light-mode .result-card{background:#F4F7FF;border-color:var(--navy-border)}
body.light-mode .result-label{color:var(--muted)}
body.light-mode .result-value{color:var(--text)}
body.light-mode .result-unit{color:var(--muted)}
body.light-mode .formula-box{background:#EEF2FF;color:#3A4A6A;border-color:var(--navy-border)}
body.light-mode .formula-box .f-step{color:#1A2A4A}
body.light-mode .formula-box .f-eq{color:var(--blue)}
body.light-mode .section-div{color:var(--blue);border-bottom-color:var(--navy-border)}
body.light-mode #theme-btn{color:var(--muted);border-color:var(--navy-border)}
body.light-mode #theme-btn:hover{color:var(--text)}
body.light-mode .nav-uname{color:var(--text)}
body.light-mode .nav-user-btn{background:#fff;border-color:var(--navy-border)}
body.light-mode .user-dropdown{background:#fff;border-color:var(--navy-border)}
body.light-mode .user-dd-item{color:var(--text)}
body.light-mode .user-dd-item:hover{background:#F0F4FF}
body.light-mode .user-dd-sep{background:var(--navy-border)}
body.light-mode #dashboard,.body.light-mode .db2-wrap{background:#fff;border-color:var(--navy-border)}
body.light-mode .dash-header{background:#fff}
body.light-mode .dash-stat{background:#F4F7FF;border-color:var(--navy-border)}
body.light-mode .dash-stat-val{color:var(--text)}
body.light-mode .dash-stat-lbl{color:var(--muted)}
body.light-mode .dash-boq-chip{color:var(--blue);background:rgba(0,102,255,0.07)}
body.light-mode .filter-pill{background:#fff;color:var(--muted);border-color:var(--navy-border)}
body.light-mode .filter-pill.active{background:var(--blue);color:#fff}
body.light-mode .guide-card{background:#fff;border-color:var(--navy-border)}
body.light-mode .formula-card{background:#fff;border-color:var(--navy-border)}
body.light-mode .formula-name{color:var(--text)}
body.light-mode .formula-eq{color:var(--blue)}
body.light-mode #toast{background:#fff;border-color:var(--navy-border);color:var(--text)}
body.light-mode .add-row-btn{color:var(--blue)}
body.light-mode .how-panel{color:var(--text)}
body.light-mode #site-footer{background:var(--navy-mid);border-top-color:var(--navy-border)}
body.light-mode .footer-links a{color:var(--muted)}
body.light-mode .footer-links a:hover{color:var(--text)}
body.light-mode .footer-copy,.body.light-mode .footer-disclaimer{color:var(--muted)}
body.light-mode .lang-btn{background:#fff;border-color:var(--navy-border);color:var(--muted)}
body.light-mode .lang-btn:hover{color:var(--text)}
body.light-mode .lang-dropdown{background:#fff;border-color:var(--navy-border)}
body.light-mode .lang-item{color:var(--text)}
body.light-mode .lang-item:hover{background:#F0F4FF}
body.light-mode .lang-item.active{color:var(--blue)}
body.light-mode .mnt-tab{color:var(--muted)}
body.light-mode .mnt-tab:hover{color:var(--text);background:var(--navy-card)}
body.light-mode .mnt-tab.active{background:var(--blue);color:#fff}
body.light-mode .bc-item{color:var(--muted)}
body.light-mode .bc-current{color:var(--text)}
body.light-mode .btn-nav-login{color:var(--muted);border-color:var(--navy-border)}
body.light-mode .btn-nav-login:hover{color:var(--text)}
body.light-mode .ad-placeholder{background:#F4F7FF;border-color:var(--navy-border);color:var(--muted)}
body.light-mode .save-calc-btn{border-color:var(--green);color:var(--green)}
body.light-mode .load-row input,.body.light-mode .load-row select{background:#F4F7FF;color:var(--text);border-color:var(--navy-border)}
body.light-mode .section-page-header{background:#fff;border-color:var(--navy-border)}
body.light-mode .section-page-title{color:var(--text)}
body.light-mode .section-page-sub{color:var(--muted)}
body.light-mode .blog-card{background:#fff;border-color:var(--navy-border)}
body.light-mode .blog-title{color:var(--text)}
body.light-mode .blog-excerpt{color:var(--muted)}
body.light-mode .pdf-resource-card{background:#fff;border-color:var(--navy-border)}
body.light-mode .pdf-info h4{color:var(--text)}
body.light-mode .pdf-info p{color:var(--muted)}
body.light-mode .related-chip{background:var(--navy-mid);border-color:var(--navy-border);color:var(--text)}
body.light-mode .related-chip:hover{background:var(--blue-dim)}
body.light-mode #calc-notes{background:#F4F7FF;color:var(--text);border-color:var(--navy-border)}
body.light-mode .fotd-card{background:#fff;border-color:rgba(0,102,255,0.2)}
body.light-mode .fotd-name{color:var(--text)}
body.light-mode #pdf-popup{background:#fff}
body.light-mode .pdf-popup-body{background:#fff}
body.light-mode .pdf-field input,.body.light-mode .pdf-field select{background:#F4F7FF;color:var(--text);border-color:var(--navy-border)}
body.light-mode .pdf-divider{background:var(--navy-border)}
body.light-mode .pdf-option-row label{color:var(--text)}
body.light-mode ::-webkit-scrollbar-track{background:var(--navy-mid)}
body.light-mode ::-webkit-scrollbar-thumb{background:var(--navy-border)}

/* ── DARK MODE TOGGLE BTN ── */
#theme-btn{width:34px;height:34px;min-width:34px;padding:0;border-radius:8px;border:1px solid var(--navy-border);background:none;color:var(--muted);cursor:pointer;display:inline-flex;align-items:center;justify-content:center;transition:var(--tr);flex-shrink:0;font-size:16px;line-height:1}
#theme-btn:hover{color:#fff;border-color:var(--blue);background:var(--blue-dim)}

/* ── PROGRESS BAR ── */
.calc-progress{
  margin:0 0 10px;
}
.progress-label{display:flex;justify-content:space-between;align-items:center;margin-bottom:4px;font-size:10px;color:var(--muted)}
.progress-label span:last-child{font-weight:700}
.progress-track{height:4px;background:var(--navy-border);border-radius:2px;overflow:hidden}
.progress-fill{height:100%;border-radius:2px;transition:width 0.5s cubic-bezier(0.4,0,0.2,1);
  background:linear-gradient(90deg,var(--amber),var(--blue),var(--green));background-size:200% 100%;
  background-position:100%}
.progress-fill.high{background-position:0%;background:linear-gradient(90deg,var(--green),var(--teal))}

/* ── RELATED CALCULATORS ── */
.modal-related{display:none}
.related-section{
  margin-top:10px;padding-top:10px;border-top:1px solid var(--navy-border)
}
.related-label{font-size:10px;font-weight:700;color:var(--muted);letter-spacing:1px;text-transform:uppercase;margin-bottom:7px}
.related-chips{display:flex;flex-direction:column;gap:5px}
.related-chip{
  display:flex;align-items:center;gap:7px;padding:7px 9px;
  background:var(--navy-mid);border:1px solid var(--navy-border);
  border-radius:7px;cursor:pointer;transition:var(--tr);font-size:11px;color:var(--text)
}
.related-chip:hover{border-color:var(--blue);background:var(--blue-dim);color:#fff}
.related-chip .r-icon{font-size:14px;flex-shrink:0}
.related-chip .r-name{font-weight:600;flex:1}
.related-chip .r-cat{font-size:9px;color:var(--muted);background:var(--navy-border);padding:1px 5px;border-radius:3px}

/* ── NOTES FIELD ── */
.notes-section{
  margin-top:10px;padding-top:10px;border-top:1px solid var(--navy-border)
}
.notes-label{font-size:10px;font-weight:700;color:var(--muted);letter-spacing:1px;text-transform:uppercase;margin-bottom:5px;display:flex;align-items:center;gap:5px}
.notes-label svg{width:11px;height:11px}
#calc-notes{
  width:100%;background:var(--navy-card);border:1px solid var(--navy-border);
  border-radius:var(--radius-sm);padding:8px 10px;color:var(--text);
  font-size:11px;outline:none;resize:vertical;min-height:60px;max-height:120px;
  font-family:var(--font);line-height:1.5;transition:var(--tr)
}
#calc-notes:focus{border-color:var(--blue);box-shadow:0 0 0 3px var(--blue-dim)}
#calc-notes::placeholder{color:var(--muted)}
.notes-saved{font-size:10px;color:var(--green);margin-top:3px;opacity:0;transition:opacity 0.3s}
.notes-saved.show{opacity:1}

/* ── SHARE RESULT BTN ── */
.share-wa-btn{
  display:flex;align-items:center;gap:5px;padding:5px 11px;border-radius:7px;
  border:1px solid #25D366;background:rgba(37,211,102,0.1);color:#25D366;
  font-size:11px;font-weight:600;cursor:pointer;transition:var(--tr);white-space:nowrap;flex-shrink:0
}
.share-wa-btn:hover{background:#25D366;color:#fff}
.share-wa-btn svg{width:12px;height:12px}

/* ── BREADCRUMB ── */
#breadcrumb{
  display:none;align-items:center;gap:5px;font-size:11px;color:var(--muted);
  padding:8px 20px 0;flex-wrap:wrap
}
#breadcrumb.show{display:flex}
.bc-item{cursor:pointer;transition:var(--tr)}
.bc-item:hover{color:var(--blue)}
.bc-sep{color:var(--navy-border);font-size:9px}
.bc-current{color:var(--text);font-weight:600;cursor:default}
#breadcrumb.show ~ .modal-body{/* no extra margin needed */}

/* ── PROJECT DASHBOARD ── */
#dashboard{background:var(--navy-card);border:1px solid var(--navy-border);border-radius:var(--radius);margin-bottom:18px;display:none}
.dash-header{display:flex;align-items:center;gap:8px;padding:10px 16px;cursor:pointer;user-select:none;border-bottom:1px solid var(--navy-border);background:rgba(0,102,255,0.05)}
.dash-header:hover{background:rgba(0,102,255,0.07)}
.dash-header-title{font-size:11px;font-weight:700;color:var(--muted);letter-spacing:1px;text-transform:uppercase;flex:1}
.dash-toggle-icon{font-size:13px;color:var(--blue);font-weight:700;transition:transform 0.2s}
#dashboard.dash-open .dash-toggle-icon{transform:rotate(180deg)}
.dash-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-bottom:12px}
.dash-stat{background:var(--navy-mid);border:1px solid var(--navy-border);border-radius:10px;padding:11px 13px;text-align:center}
.dash-stat-val{font-size:22px;font-weight:700;color:#fff;font-family:var(--mono);line-height:1}
.dash-stat-lbl{font-size:10px;color:var(--muted);margin-top:3px}
.dash-boq-section{border-top:1px solid var(--navy-border);padding-top:10px}
.dash-boq-label{font-size:10px;font-weight:600;color:var(--muted);letter-spacing:1px;text-transform:uppercase;margin-bottom:7px}
.dash-boq-chips{display:flex;gap:7px;flex-wrap:wrap}
.dash-boq-chip{display:flex;align-items:center;gap:5px;padding:6px 10px;background:var(--blue-dim);border:1px solid var(--blue);border-radius:7px;cursor:pointer;transition:var(--tr);font-size:11px;font-weight:600;color:var(--blue)}
.dash-boq-chip:hover{background:var(--blue);color:#fff}
/* ══════════════════════════════════════════════════════════
   V7 - PDF SYSTEM CSS
══════════════════════════════════════════════════════════ */

/* ── PDF REPORT POPUP ── */
#pdf-popup-overlay{
  display:none;position:fixed;inset:0;z-index:3000;
  background:rgba(5,8,20,0.92);backdrop-filter:blur(12px);
  align-items:center;justify-content:center;padding:20px
}
#pdf-popup-overlay.open{display:flex}
#pdf-popup{
  background:var(--navy-mid);border:1px solid var(--navy-border);
  border-radius:18px;width:100%;max-width:520px;
  box-shadow:0 32px 80px rgba(0,0,0,0.7);
  animation:modalIn 0.26s cubic-bezier(0.34,1.56,0.64,1)
}
.pdf-popup-header{
  background:linear-gradient(135deg,#0047CC,#0066FF);
  padding:16px 20px;border-radius:17px 17px 0 0;
  display:flex;align-items:center;gap:10px
}
.pdf-popup-header svg{width:20px;height:20px;color:#fff;flex-shrink:0}
.pdf-popup-title{color:#fff;font-size:15px;font-weight:700;flex:1}
.pdf-popup-subtitle{color:rgba(255,255,255,0.75);font-size:10px;margin-top:1px}
.pdf-popup-body{padding:18px 20px;max-height:70vh;overflow-y:auto}
.pdf-field-row{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-bottom:10px}
.pdf-field-row.single{grid-template-columns:1fr}
.pdf-field{display:flex;flex-direction:column;gap:4px}
.pdf-field label{font-size:10px;font-weight:600;color:var(--muted);text-transform:uppercase;letter-spacing:0.5px}
.pdf-field input,.pdf-field select{
  background:var(--navy-card);border:1px solid var(--navy-border);
  border-radius:var(--radius-sm);padding:8px 10px;color:#fff;
  font-size:12px;outline:none;transition:var(--tr)
}
.pdf-field input:focus,.pdf-field select:focus{border-color:var(--blue);box-shadow:0 0 0 3px var(--blue-dim)}
.pdf-field select option{background:var(--navy-card)}
.pdf-divider{height:1px;background:var(--navy-border);margin:14px 0}
.pdf-options-title{font-size:10px;font-weight:700;color:var(--muted);letter-spacing:1px;text-transform:uppercase;margin-bottom:8px}
.pdf-option-row{display:flex;align-items:center;gap:8px;padding:5px 0;cursor:pointer}
.pdf-option-row input[type=checkbox]{width:14px;height:14px;accent-color:var(--blue);cursor:pointer}
.pdf-option-row label{font-size:12px;color:var(--text);cursor:pointer}
.pdf-popup-footer{
  display:flex;gap:10px;padding:14px 20px;
  border-top:1px solid var(--navy-border)
}
.pdf-cancel-btn{
  flex:1;padding:10px;border-radius:9px;border:1px solid var(--navy-border);
  background:none;color:var(--muted);font-size:13px;font-weight:600;cursor:pointer;transition:var(--tr)
}
.pdf-cancel-btn:hover{border-color:var(--red);color:var(--red)}
.pdf-generate-btn{
  flex:2;padding:10px;border-radius:9px;border:none;
  background:var(--blue);color:#fff;font-size:13px;font-weight:700;cursor:pointer;
  transition:var(--tr);display:flex;align-items:center;justify-content:center;gap:7px
}
.pdf-generate-btn:hover{background:var(--blue-light);box-shadow:var(--glow)}
.pdf-generate-btn svg{width:15px;height:15px}

/* ── QUICK PRINT BTN ── */
.quick-print-btn{
  display:flex;align-items:center;gap:5px;padding:5px 11px;border-radius:7px;
  border:1px solid var(--navy-border);background:none;color:var(--muted);
  font-size:11px;font-weight:600;cursor:pointer;transition:var(--tr);white-space:nowrap
}
.quick-print-btn:hover{border-color:var(--blue);color:var(--blue);background:var(--blue-dim)}
.quick-print-btn svg{width:12px;height:12px}


/* ── LOADING SPINNER ── */
#pdf-loading{
  display:none;position:fixed;inset:0;z-index:4000;
  background:rgba(5,8,20,0.8);backdrop-filter:blur(8px);
  align-items:center;justify-content:center;flex-direction:column;gap:16px
}
#pdf-loading.show{display:flex}
.pdf-spinner{
  width:48px;height:48px;border:4px solid var(--navy-border);
  border-top-color:var(--blue);border-radius:50%;
  animation:spin 0.8s linear infinite
}
@keyframes spin{to{transform:rotate(360deg)}}
.pdf-loading-text{color:#fff;font-size:14px;font-weight:600}

/* ── PRINT CSS ── */
@media print{
  #nav,#sidebar,#mobile-backdrop,#back-top,#wa-btn,
  #pdf-popup-overlay,#pdf-loading,footer,
  .modal-actions,.modal-breadcrumb,.share-wa-btn,
  .pdf-btn,.quick-print-btn,.icon-btn,
  .ad-placeholder,.dashboard,.cat-pills,
  .calc-btn,.fav-star,.card-usage,
  #breadcrumb,#dashboard{display:none!important}
  body{background:#fff!important;color:#000!important}
  #modal-overlay{position:static!important;background:none!important;backdrop-filter:none!important;padding:0!important}
  #modal{box-shadow:none!important;border:none!important;max-width:100%!important;border-radius:0!important}
  .modal-body{flex-direction:column!important}
  .modal-inputs{border:none!important;max-height:none!important}
  .modal-results{width:100%!important;max-height:none!important;background:#fff!important}
  .result-card{background:#f8fafc!important;border:1px solid #cbd5e1!important;break-inside:avoid}
  .result-value{color:#0066FF!important}
  .formula-box{background:#f0f7ff!important;border:1px solid #cbd5e1!important}
  .inp{background:#fff!important;border:1px solid #ccc!important;color:#000!important}
  .print-header{display:block!important}
  @page{size:A4;margin:15mm}
}
.print-header{
  display:none;padding:10px 0 14px;border-bottom:2px solid #0066FF;margin-bottom:14px
}
.print-header h1{font-size:18px;color:#0066FF;font-weight:700}
.print-header p{font-size:10px;color:#666;margin-top:3px}

/* ══════════════════════════════════════════════════════════
   V8 - NAV TABS + SECTIONS CSS
══════════════════════════════════════════════════════════ */

/* ── Section switcher (views) ── */
.app-view{display:none}
.app-view.active{display:block}

/* ── Nav tabs ── */
.nav-tabs{display:flex;gap:2px;align-items:center;flex-shrink:0}
.nav-tab{padding:5px 11px;border-radius:7px;font-size:12px;font-weight:600;cursor:pointer;
  border:none;background:none;color:var(--muted);transition:var(--tr);white-space:nowrap}
.nav-tab:hover{color:#fff;background:var(--navy-card)}
.nav-tab.active{background:var(--blue);color:#fff}
@media(max-width:960px){.nav-tabs{display:none}}

/* ── Section page header ── */
.section-page{padding:20px 22px;min-height:calc(100vh - 60px)}
.section-page-header{margin-bottom:20px;padding-bottom:14px;border-bottom:1px solid var(--navy-border)}
.section-page-title{font-size:22px;font-weight:700;color:#fff;display:flex;align-items:center;gap:10px}
.section-page-sub{font-size:13px;color:var(--muted);margin-top:4px}
.section-search-bar{display:flex;align-items:center;gap:8px;background:var(--navy-card);
  border:1px solid var(--navy-border);border-radius:10px;padding:0 14px;height:40px;
  width:100%;max-width:400px;margin-top:12px;transition:var(--tr)}
.section-search-bar:focus-within{border-color:var(--blue);box-shadow:0 0 0 3px var(--blue-dim)}
.section-search-bar input{background:none;border:none;outline:none;color:#fff;font-size:13px;width:100%}
.section-search-bar input::placeholder{color:var(--muted)}
.section-search-bar svg{width:15px;height:15px;color:var(--muted);flex-shrink:0}
.filter-pills{display:flex;gap:6px;flex-wrap:wrap;margin-top:10px}
.filter-pill{padding:5px 12px;border-radius:20px;font-size:11px;font-weight:600;cursor:pointer;
  border:1px solid var(--navy-border);background:var(--navy-card);color:var(--muted);transition:var(--tr)}
.filter-pill.active{background:var(--blue);border-color:var(--blue);color:#fff}

/* ═══════════════════════════════════
   FEATURE 1 - STAMP GENERATOR
═══════════════════════════════════ */
.stamp-layout{display:grid;grid-template-columns:1fr 360px;gap:20px;align-items:start}
@media(max-width:900px){.stamp-layout{grid-template-columns:1fr}}
.stamp-form-card{background:var(--navy-card);border:1px solid var(--navy-border);border-radius:var(--radius);padding:20px}
.stamp-preview-card{background:var(--navy-card);border:1px solid var(--navy-border);border-radius:var(--radius);padding:20px;position:sticky;top:80px}
.stamp-preview-title{font-size:11px;font-weight:700;color:var(--muted);letter-spacing:1px;text-transform:uppercase;margin-bottom:12px}
.stamp-canvas-wrap{display:flex;justify-content:center;margin-bottom:14px}
#stamp-canvas{border-radius:8px}
.stamp-style-grid{display:grid;grid-template-columns:1fr 1fr 1fr;gap:8px;margin-bottom:14px}
.stamp-style-opt{
  border:2px solid var(--navy-border);border-radius:9px;padding:10px 6px;text-align:center;
  cursor:pointer;transition:var(--tr);font-size:11px;font-weight:600;color:var(--muted)
}
.stamp-style-opt:hover{border-color:var(--blue);color:#fff}
.stamp-style-opt.active{border-color:var(--blue);background:var(--blue-dim);color:var(--blue)}
.stamp-style-icon{font-size:22px;display:block;margin-bottom:4px}
.stamp-color-row{display:flex;gap:10px;align-items:center;margin-bottom:14px}
.color-dot{width:24px;height:24px;border-radius:50%;cursor:pointer;border:3px solid transparent;transition:var(--tr)}
.color-dot.active{border-color:#fff;box-shadow:0 0 0 2px var(--blue)}
.stamp-actions-row{display:flex;gap:8px;flex-wrap:wrap}
.stamp-act-btn{flex:1;min-width:80px;padding:8px 6px;border-radius:7px;border:1px solid var(--navy-border);
  background:none;color:var(--muted);font-size:11px;font-weight:600;cursor:pointer;transition:var(--tr);text-align:center}
.stamp-act-btn:hover{border-color:var(--blue);color:var(--blue);background:var(--blue-dim)}
.stamp-act-btn.primary{background:var(--blue);border-color:var(--blue);color:#fff}
.stamp-act-btn.primary:hover{background:var(--blue-light)}
.saved-stamps-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(140px,1fr));gap:10px;margin-top:10px}
.saved-stamp-item{background:var(--navy-mid);border:1px solid var(--navy-border);border-radius:9px;
  padding:10px;text-align:center;cursor:pointer;transition:var(--tr)}
.saved-stamp-item:hover{border-color:var(--blue)}
.saved-stamp-item img{width:100px;height:100px;object-fit:contain;border-radius:6px}
.saved-stamp-name{font-size:11px;color:var(--muted);margin-top:5px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}

/* ═══════════════════════════════════
   FEATURE 2 - DESIGN GUIDES
═══════════════════════════════════ */
.guides-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:14px}
.guide-card{background:var(--navy-card);border:1px solid var(--navy-border);border-radius:var(--radius);
  padding:18px;cursor:pointer;transition:var(--tr);opacity:0;animation:cardIn 0.38s forwards}
.guide-card:hover{border-color:var(--blue);transform:translateY(-2px);box-shadow:var(--shadow)}
.guide-card-top{display:flex;align-items:flex-start;justify-content:space-between;margin-bottom:10px}
.guide-icon{width:40px;height:40px;border-radius:10px;display:grid;place-items:center;font-size:20px;flex-shrink:0}
.guide-bookmark{background:none;border:none;font-size:16px;cursor:pointer;color:var(--navy-border);transition:var(--tr)}
.guide-bookmark:hover,.guide-bookmark.active{color:var(--amber)}
.guide-cat-badge{font-size:9px;font-weight:700;letter-spacing:1px;text-transform:uppercase;padding:2px 7px;border-radius:4px;margin-bottom:5px;display:inline-block}
.guide-title{font-size:14px;font-weight:700;color:#fff;line-height:1.3;margin-bottom:6px}
.guide-desc{font-size:11.5px;color:var(--muted);line-height:1.5;margin-bottom:12px}
.guide-meta{display:flex;align-items:center;justify-content:space-between;font-size:10px;color:var(--muted)}
.guide-read-btn{width:100%;padding:9px;border-radius:var(--radius-sm);border:none;background:var(--blue);
  color:#fff;font-size:12.5px;font-weight:600;cursor:pointer;margin-top:10px;transition:var(--tr)}
.guide-read-btn:hover{background:var(--blue-light)}

/* Guide reader */
#guide-reader{display:none;position:fixed;inset:0;z-index:2500;background:var(--navy);overflow-y:auto}
#guide-reader.open{display:block}
.guide-reader-nav{position:sticky;top:0;z-index:10;background:rgba(10,15,44,0.95);
  backdrop-filter:blur(16px);border-bottom:1px solid var(--navy-border);
  padding:0 20px;height:52px;display:flex;align-items:center;gap:12px}
.guide-reader-back{background:none;border:1px solid var(--navy-border);border-radius:7px;
  padding:5px 11px;color:var(--muted);font-size:12px;font-weight:600;cursor:pointer;transition:var(--tr)}
.guide-reader-back:hover{color:#fff;border-color:var(--blue)}
.guide-reader-title{flex:1;font-size:14px;font-weight:700;color:#fff;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.guide-reader-progress{position:sticky;top:52px;height:3px;background:var(--navy-border);z-index:9}
.guide-reader-progress-fill{height:100%;background:var(--blue);width:0;transition:width 0.1s}
.guide-content{max-width:820px;margin:0 auto;padding:28px 20px 60px}
.guide-content h2{font-size:18px;font-weight:700;color:#fff;margin:24px 0 10px;padding-bottom:8px;border-bottom:1px solid var(--navy-border)}
.guide-content h3{font-size:14px;font-weight:700;color:var(--blue);margin:18px 0 8px}
.guide-content p{font-size:13px;color:var(--text);line-height:1.7;margin-bottom:10px}
.guide-content table{width:100%;border-collapse:collapse;margin:12px 0;font-size:12px}
.guide-content th{background:var(--blue);color:#fff;padding:7px 10px;text-align:left;font-weight:700}
.guide-content td{padding:6px 10px;border-bottom:1px solid var(--navy-border);color:var(--text)}
.guide-content tr:nth-child(even) td{background:var(--navy-mid)}
.guide-tip{background:rgba(0,230,118,0.08);border:1px solid rgba(0,230,118,0.3);border-left:3px solid var(--green);border-radius:6px;padding:10px 13px;margin:10px 0;font-size:12px;color:var(--text)}
.guide-warn{background:rgba(255,61,87,0.08);border:1px solid rgba(255,61,87,0.3);border-left:3px solid var(--red);border-radius:6px;padding:10px 13px;margin:10px 0;font-size:12px;color:var(--text)}
.guide-highlight{background:rgba(255,179,0,0.1);border:1px solid rgba(255,179,0,0.3);border-left:3px solid var(--amber);border-radius:6px;padding:10px 13px;margin:10px 0;font-size:12px;color:var(--text)}
.guide-calc-link{display:inline-flex;align-items:center;gap:5px;background:var(--blue-dim);border:1px solid var(--blue);
  border-radius:6px;padding:4px 10px;font-size:11px;font-weight:600;color:var(--blue);cursor:pointer;transition:var(--tr);margin:3px 3px 3px 0}
.guide-calc-link:hover{background:var(--blue);color:#fff}

/* ═══════════════════════════════════
   FEATURE 3 - FORMULA LIBRARY
═══════════════════════════════════ */
.formula-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(340px,1fr));gap:14px}
.formula-card{background:var(--navy-card);border:1px solid var(--navy-border);border-radius:var(--radius);
  overflow:hidden;transition:var(--tr)}
.formula-card:hover{border-color:var(--blue)}
.formula-card-header{display:flex;align-items:center;justify-content:space-between;padding:12px 14px;border-bottom:1px solid var(--navy-border)}
.formula-cat-tag{font-size:9px;font-weight:700;letter-spacing:1px;text-transform:uppercase;padding:2px 7px;border-radius:4px}
.formula-bookmark{background:none;border:none;font-size:15px;cursor:pointer;color:var(--navy-border);transition:var(--tr)}
.formula-bookmark:hover,.formula-bookmark.active{color:var(--amber)}
.formula-name{font-size:13px;font-weight:700;color:#fff;padding:10px 14px 4px}
.formula-box-main{
  background:rgba(0,0,0,0.3);border:1px solid var(--blue);border-radius:8px;
  margin:0 14px 10px;padding:12px 14px;font-family:var(--mono);font-size:13px;
  color:#fff;text-align:center;font-weight:700;letter-spacing:0.3px
}
.formula-vars{padding:0 14px 10px;font-size:11.5px;color:var(--muted);line-height:1.7}
.formula-vars span.var-name{color:var(--blue);font-family:var(--mono);font-weight:700}
.formula-expand-btn{width:100%;padding:8px 14px;background:none;border:none;border-top:1px solid var(--navy-border);
  color:var(--muted);font-size:11px;font-weight:600;cursor:pointer;text-align:left;display:flex;align-items:center;justify-content:space-between;transition:var(--tr)}
.formula-expand-btn:hover{background:var(--navy-mid);color:#fff}
.formula-expanded{display:none;padding:12px 14px;border-top:1px solid var(--navy-border);font-size:12px}
.formula-expanded.show{display:block}
.formula-section-title{font-size:10px;font-weight:700;color:var(--blue);letter-spacing:1px;text-transform:uppercase;margin:10px 0 5px}
.formula-example{background:var(--navy-mid);border-radius:6px;padding:10px;font-size:11.5px;color:var(--text);font-family:var(--mono);margin-bottom:8px}
.formula-mistake{color:var(--red);font-size:11.5px;margin:2px 0}
.formula-action-row{display:flex;gap:7px;padding:10px 14px;border-top:1px solid var(--navy-border);flex-wrap:wrap}
.formula-act-btn{flex:1;min-width:60px;padding:6px 8px;border-radius:6px;border:1px solid var(--navy-border);
  background:none;color:var(--muted);font-size:10.5px;font-weight:600;cursor:pointer;transition:var(--tr);text-align:center;white-space:nowrap}
.formula-act-btn:hover{border-color:var(--blue);color:var(--blue);background:var(--blue-dim)}
.formula-act-btn.use-calc{background:var(--blue);border-color:var(--blue);color:#fff}
.formula-act-btn.use-calc:hover{background:var(--blue-light)}

/* ── Formula of the Day (dashboard) ── */
.fotd-card{background:var(--navy-card);border:1px solid var(--blue);border-radius:var(--radius);padding:14px 16px;margin-bottom:14px}
.fotd-label{font-size:9px;font-weight:700;color:var(--blue);letter-spacing:1.5px;text-transform:uppercase;margin-bottom:6px}
.fotd-name{font-size:13px;font-weight:700;color:#fff;margin-bottom:6px}
.fotd-formula{background:rgba(0,0,0,0.3);border-radius:6px;padding:8px 12px;font-family:var(--mono);font-size:13px;color:var(--blue);font-weight:700;text-align:center;margin-bottom:8px}
.fotd-btn{font-size:11px;font-weight:600;color:var(--blue);background:none;border:none;cursor:pointer;padding:0}
.fotd-btn:hover{text-decoration:underline}

/* ── Global search results ── */
#global-search-results{
  display:none;position:fixed;z-index:1500;
  background:var(--navy-mid);border:1px solid var(--navy-border);
  border-radius:14px;width:500px;max-width:95vw;
  box-shadow:0 24px 64px rgba(0,0,0,0.6);max-height:72vh;overflow-y:auto;
  animation:gsrIn 0.18s ease
}
@keyframes gsrIn{from{opacity:0;transform:translateY(-8px)}to{opacity:1;transform:translateY(0)}}
#global-search-results.show{display:block}
.gsr-section{padding:6px 0}
.gsr-section+.gsr-section{border-top:1px solid var(--navy-border)}
.gsr-section-title{font-size:9px;font-weight:700;color:var(--muted);letter-spacing:1.5px;text-transform:uppercase;padding:6px 14px 4px}
.gsr-item{display:flex;align-items:center;gap:10px;padding:8px 14px;cursor:pointer;transition:var(--tr)}
.gsr-item:hover,.gsr-item.focused{background:var(--navy-card)}
.gsr-item-icon{width:32px;height:32px;border-radius:8px;display:grid;place-items:center;font-size:16px;flex-shrink:0;background:var(--blue-dim)}
.gsr-item-name{font-size:12.5px;font-weight:600;color:var(--text)}
.gsr-item-sub{font-size:10px;color:var(--muted)}
.gsr-item-type{font-size:9px;background:var(--navy-border);padding:2px 6px;border-radius:3px;color:var(--muted);margin-left:auto;flex-shrink:0}
.gsr-highlight{color:var(--blue);font-weight:700}
.gsr-empty{padding:20px;font-size:12px;color:var(--muted);text-align:center}
.gsr-footer{padding:8px 14px;font-size:10px;color:var(--muted);border-top:1px solid var(--navy-border);display:flex;align-items:center;gap:8px}
.gsr-kbd{background:var(--navy-border);border-radius:3px;padding:1px 5px;font-family:monospace;font-size:9px}

/* ── Quick stats bar ── */
.quick-stats-bar{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-bottom:16px}
.qs-item{background:var(--navy-card);border:1px solid var(--navy-border);border-radius:10px;padding:12px 14px;text-align:center;cursor:pointer;transition:var(--tr)}
.qs-item:hover{border-color:var(--blue)}
.qs-val{font-size:24px;font-weight:700;color:var(--blue);font-family:var(--mono);line-height:1}
.qs-lbl{font-size:10px;color:var(--muted);margin-top:3px}

/* ── Keyboard shortcuts hint ── */
.kb-hint{font-size:9px;color:var(--muted);padding:2px 5px;background:var(--navy-border);border-radius:3px;font-family:var(--mono)}

@media(max-width:580px){
  .stamp-style-grid{grid-template-columns:1fr 1fr 1fr}
  .formula-grid{grid-template-columns:1fr}
  .guides-grid{grid-template-columns:1fr}
  .quick-stats-bar{grid-template-columns:1fr 1fr 1fr}
}


/* ── LANGUAGE SWITCHER ── */
.lang-switcher{position:relative;flex-shrink:0}
.lang-btn{display:flex;align-items:center;gap:5px;padding:5px 9px;background:var(--navy-card);border:1px solid var(--navy-border);border-radius:8px;color:var(--muted);cursor:pointer;font-size:12px;font-weight:500;transition:var(--tr);white-space:nowrap}
.lang-btn:hover,.lang-btn.open{border-color:var(--blue);color:#fff}
.lang-btn svg{width:11px;height:11px;transition:transform 0.2s}
.lang-btn.open svg{transform:rotate(180deg)}
.lang-flag{font-size:13px;line-height:1}
.lang-code{font-weight:700;text-transform:uppercase;font-size:10px}
.lang-dropdown{position:absolute;top:calc(100% + 6px);right:0;background:var(--navy-card);border:1px solid var(--navy-border);border-radius:12px;box-shadow:0 16px 48px rgba(0,0,0,0.6);z-index:9999;min-width:210px;max-height:320px;overflow-y:auto;display:none;padding:5px}
.lang-dropdown.open{display:block;animation:dropIn 0.16s ease}
@keyframes dropIn{from{opacity:0;transform:translateY(-5px)}to{opacity:1;transform:translateY(0)}}
.lang-group-title{font-size:9px;font-weight:700;letter-spacing:1.5px;text-transform:uppercase;color:var(--muted);padding:6px 10px 3px}
.lang-item{display:flex;align-items:center;gap:8px;padding:6px 10px;border-radius:7px;cursor:pointer;transition:var(--tr);color:var(--text);font-size:12px;text-decoration:none}
.lang-item:hover{background:var(--blue-dim);color:#fff}
.lang-item.active{background:var(--blue-dim);color:var(--blue);font-weight:600}
.lang-item-flag{font-size:15px;width:20px;text-align:center}
.lang-item-name{flex:1}
.lang-item-native{font-size:10px;color:var(--muted)}
/* ── AUTH NAV ── */
.nav-auth{display:flex;align-items:center;gap:6px;flex-shrink:0}
.btn-nav-login{padding:5px 12px;border-radius:7px;border:1px solid var(--navy-border);background:none;color:var(--muted);font-size:12px;font-weight:500;cursor:pointer;transition:var(--tr);text-decoration:none;display:inline-flex;align-items:center}
.btn-nav-login:hover{border-color:var(--blue);color:#fff}
.btn-nav-register{padding:5px 12px;border-radius:7px;border:none;background:var(--blue);color:#fff;font-size:12px;font-weight:600;cursor:pointer;transition:var(--tr);text-decoration:none;display:inline-flex;align-items:center;gap:4px}
.btn-nav-register:hover{background:var(--blue-light)}
.nav-user-menu{position:relative;flex-shrink:0}
.nav-user-btn{display:flex;align-items:center;gap:7px;padding:4px 9px;background:var(--navy-card);border:1px solid var(--navy-border);border-radius:8px;cursor:pointer;transition:var(--tr)}
.nav-user-btn:hover{border-color:var(--blue)}
.nav-avatar{width:26px;height:26px;background:var(--blue);border-radius:50%;display:grid;place-items:center;font-size:11px;font-weight:700;color:#fff;flex-shrink:0}
.nav-uname{font-size:12px;color:#fff;max-width:80px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.nav-plan-badge{font-size:9px;padding:1px 5px;border-radius:3px;font-weight:700;text-transform:uppercase}
.badge-free{background:var(--navy-border);color:var(--muted)}
.badge-pro{background:rgba(255,179,0,0.2);color:var(--amber)}
.badge-team{background:rgba(0,230,118,0.15);color:var(--green)}
.user-dropdown{position:absolute;top:calc(100% + 6px);right:0;background:var(--navy-card);border:1px solid var(--navy-border);border-radius:12px;box-shadow:var(--shadow);z-index:9999;min-width:175px;padding:5px;display:none}
.user-dropdown.open{display:block;animation:dropIn 0.16s ease}
.user-dd-item{display:flex;align-items:center;gap:8px;padding:8px 11px;border-radius:7px;color:var(--text);font-size:12.5px;cursor:pointer;transition:var(--tr);text-decoration:none}
.user-dd-item:hover{background:var(--blue-dim);color:#fff}
.user-dd-item.danger:hover{background:rgba(255,61,87,0.1);color:var(--red)}
.user-dd-sep{height:1px;background:var(--navy-border);margin:4px 0}
.save-calc-btn{display:flex;align-items:center;gap:5px;padding:5px 10px;border-radius:7px;border:1px solid var(--green);background:rgba(0,230,118,0.08);color:var(--green);font-size:11px;font-weight:600;cursor:pointer;transition:var(--tr)}
.save-calc-btn:hover{background:var(--green);color:#000}
.save-calc-btn.saved{border-color:var(--amber);background:rgba(255,179,0,0.1);color:var(--amber)}
[dir="rtl"] #sidebar{border-right:none;border-left:1px solid var(--navy-border)}
[dir="rtl"] .cat-btn{border-left:none;border-right:3px solid transparent;text-align:right}
[dir="rtl"] .cat-btn.active{border-right-color:var(--blue)}
[dir="rtl"] .lang-dropdown,[dir="rtl"] .user-dropdown{right:auto;left:0}

/* ── MAIN NAV TABS ── */
.main-nav-tabs{display:flex;gap:2px;align-items:center;flex-shrink:0;margin:0 6px}
.mnt-tab{padding:6px 13px;border-radius:8px;font-size:12px;font-weight:600;cursor:pointer;
  border:none;background:none;color:var(--muted);transition:var(--tr);white-space:nowrap;
  display:flex;align-items:center;gap:5px}
.mnt-tab:hover{color:#fff;background:var(--navy-card)}
.mnt-tab.active{background:var(--blue);color:#fff}
.mnt-tab svg{width:13px;height:13px;flex-shrink:0}
@media(max-width:1100px){.mnt-tab span.tab-label{display:none}}
@media(max-width:900px){.main-nav-tabs{display:none}}

/* ── COLLAPSIBLE DASHBOARD ── */
#dashboard{background:var(--navy-card);border:1px solid var(--navy-border);
  border-radius:var(--radius);margin-bottom:18px;overflow:hidden;transition:var(--tr)}
.dash-header{display:flex;align-items:center;justify-content:space-between;
  padding:10px 16px;cursor:pointer;user-select:none;transition:var(--tr)}
.dash-header:hover{background:rgba(0,102,255,0.06)}
.dash-header-left{display:flex;align-items:center;gap:8px}
.dash-header-title{font-size:11px;font-weight:700;letter-spacing:1px;
  text-transform:uppercase;color:var(--muted)}
.dash-collapse-btn{width:24px;height:24px;border-radius:6px;border:1px solid var(--navy-border);
  background:none;color:var(--muted);cursor:pointer;display:grid;place-items:center;
  font-size:11px;transition:var(--tr);flex-shrink:0}
.dash-collapse-btn:hover{border-color:var(--blue);color:var(--blue)}
.dash-toggle-icon{display:inline-block;transition:transform 0.25s ease;font-size:11px;color:var(--muted)}

/* ── BLOGS VIEW ── */
#view-blogs{padding:0}
.blog-hero{background:linear-gradient(135deg,rgba(0,102,255,0.15),rgba(0,188,212,0.08));
  border:1px solid rgba(0,102,255,0.2);border-radius:var(--radius);padding:28px;
  margin-bottom:22px;text-align:center}
.blog-hero h2{font-size:22px;font-weight:700;color:#fff;margin-bottom:6px}
.blog-hero p{font-size:13px;color:var(--muted)}
.blog-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:14px;margin-bottom:22px}
.blog-card{background:var(--navy-card);border:1px solid var(--navy-border);border-radius:var(--radius);
  padding:20px;transition:var(--tr);cursor:pointer;position:relative;overflow:hidden}
.blog-card::before{content:'';position:absolute;top:0;left:0;right:0;height:2px;
  background:var(--card-accent,var(--blue));opacity:0;transition:var(--tr)}
.blog-card:hover{border-color:var(--blue);transform:translateY(-2px)}
.blog-card:hover::before{opacity:1}
.blog-cat{font-size:10px;font-weight:700;text-transform:uppercase;letter-spacing:1px;
  color:var(--blue);margin-bottom:8px}
.blog-title{font-size:15px;font-weight:700;color:#fff;margin-bottom:8px;line-height:1.3}
.blog-excerpt{font-size:12px;color:var(--muted);line-height:1.6;margin-bottom:12px}
.blog-meta{display:flex;align-items:center;gap:10px;font-size:10px;color:var(--muted)}
.blog-read-more{margin-left:auto;color:var(--blue);font-weight:600}
.blog-coming-soon{text-align:center;padding:40px 20px;color:var(--muted)}
.blog-coming-soon .emoji{font-size:40px;margin-bottom:12px}

/* ── PDF CONTENT VIEW ── */
#view-pdfs{padding:0}
.pdf-hero{background:linear-gradient(135deg,rgba(255,61,87,0.12),rgba(255,112,67,0.08));
  border:1px solid rgba(255,61,87,0.2);border-radius:var(--radius);padding:28px;
  margin-bottom:22px;text-align:center}
.pdf-hero h2{font-size:22px;font-weight:700;color:#fff;margin-bottom:6px}
.pdf-hero p{font-size:13px;color:var(--muted)}
.pdf-resources-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:14px}
.pdf-resource-card{background:var(--navy-card);border:1px solid var(--navy-border);
  border-radius:var(--radius);padding:18px;transition:var(--tr);display:flex;align-items:flex-start;gap:13px}
.pdf-resource-card:hover{border-color:var(--red);transform:translateY(-2px)}
.pdf-icon{width:42px;height:42px;border-radius:9px;background:rgba(255,61,87,0.1);
  display:grid;place-items:center;font-size:20px;flex-shrink:0}
.pdf-info h4{font-size:13px;font-weight:700;color:#fff;margin-bottom:4px}
.pdf-info p{font-size:11px;color:var(--muted);line-height:1.5;margin-bottom:10px}
.pdf-download-btn{display:inline-flex;align-items:center;gap:5px;padding:5px 12px;
  border-radius:6px;background:rgba(255,61,87,0.1);border:1px solid rgba(255,61,87,0.3);
  color:var(--red);font-size:11px;font-weight:600;cursor:pointer;transition:var(--tr);text-decoration:none}
.pdf-download-btn:hover{background:var(--red);color:#fff}

/* ── FOOTER ── */
#site-footer{background:var(--navy-mid);border-top:1px solid var(--navy-border);
  padding:32px 24px 20px;margin-top:32px}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:28px;max-width:1200px;
  margin:0 auto 24px}
.footer-brand .logo-name{font-size:18px;font-weight:700;color:#fff}
.footer-brand p{font-size:12px;color:var(--muted);margin-top:6px;line-height:1.6;max-width:240px}
.footer-col h4{font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:1px;
  color:var(--muted);margin-bottom:12px}
.footer-links{list-style:none;display:flex;flex-direction:column;gap:8px}
.footer-links a{font-size:12px;color:var(--muted);transition:var(--tr);text-decoration:none}
.footer-links a:hover{color:#fff}
.footer-bottom{max-width:1200px;margin:0 auto;padding-top:16px;
  border-top:1px solid var(--navy-border);display:flex;align-items:center;
  justify-content:space-between;flex-wrap:wrap;gap:8px}
.footer-copy{font-size:11px;color:var(--muted)}
.footer-disclaimer{font-size:10px;color:var(--muted);text-align:center;flex:1}
.footer-social{display:flex;gap:8px}
.footer-social a{width:30px;height:30px;border-radius:7px;border:1px solid var(--navy-border);
  display:grid;place-items:center;color:var(--muted);transition:var(--tr);font-size:14px}
.footer-social a:hover{border-color:var(--blue);color:#fff}
@media(max-width:768px){.footer-grid{grid-template-columns:1fr 1fr}.footer-bottom{flex-direction:column;text-align:center}}
@media(max-width:480px){.footer-grid{grid-template-columns:1fr}}

#dashboard{background:var(--navy-card);border:1px solid var(--navy-border);border-radius:var(--radius);margin-bottom:18px;overflow:hidden}
.dash-header{display:flex;align-items:center;justify-content:space-between;padding:11px 16px;cursor:pointer;user-select:none;transition:var(--tr);background:var(--navy-card)}
.dash-header:hover{background:rgba(0,102,255,0.07)}
.dash-body{display:none;padding:14px 16px 16px;border-top:1px solid var(--navy-border)}
#dashboard.dash-open .dash-body{display:block}

/* ═══ 3-SECTION MODAL SYSTEM ═══ */
#modal{max-width:1180px!important;width:96%!important}
.modal-body{display:flex!important;gap:14px!important;padding:16px 18px!important;align-items:flex-start!important;min-height:0;background:var(--navy)}
.modal-inputs{flex:1.05!important;min-width:280px!important;padding:16px 18px!important;overflow-y:auto!important;max-height:74vh!important;background:var(--navy-mid)!important;border:1px solid var(--navy-border)!important;border-radius:12px!important}
.mep-rescol{flex:0.95!important;width:auto!important;min-width:290px!important;max-width:380px!important;display:flex!important;flex-direction:column!important;max-height:74vh!important;overflow-y:auto!important;flex-shrink:0}
.mep-rescol .modal-results{width:100%!important;max-height:none!important;overflow:visible!important;padding:16px!important;background:var(--navy-mid)!important;border:1px solid var(--navy-border)!important;border-radius:12px!important;display:flex!important;flex-direction:column!important;gap:9px!important}
#modal-results .formula-box{display:none!important} /* Moved to Section 3: DETAILED CALCULATIONS */

/* 3rd Column: Engineering Intelligence */
.modal-intel-col{flex:1.25!important;min-width:330px!important;max-height:74vh!important;overflow-y:auto!important;background:var(--navy-mid)!important;border:1px solid var(--navy-border)!important;border-radius:12px!important;padding:16px!important;display:flex!important;flex-direction:column!important;gap:12px!important}

.intel-section{background:rgba(10,15,44,0.5);border:1px solid var(--navy-border);border-radius:10px;padding:12px 14px;display:flex;flex-direction:column;gap:9px}
body.light-mode .intel-section{background:#f8faff;border-color:var(--navy-border)}
.intel-sec-header{display:flex;align-items:center;justify-content:space-between;gap:8px;padding-bottom:7px;border-bottom:1px solid rgba(255,255,255,0.06)}
body.light-mode .intel-sec-header{border-bottom-color:rgba(0,0,0,0.08)}
.intel-sec-title{display:flex;align-items:center;gap:7px;font-size:11px;font-weight:700;letter-spacing:0.8px;text-transform:uppercase;color:var(--text)}
.intel-sec-icon{font-size:13px}
.intel-badge{font-size:9.5px;font-weight:700;padding:2px 8px;border-radius:10px;letter-spacing:0.5px}
.intel-badge.badge-pass{background:rgba(16,185,129,0.15);color:#10B981;border:1px solid rgba(16,185,129,0.35)}
.intel-badge.badge-warn{background:rgba(245,158,11,0.18);color:#F59E0B;border:1px solid rgba(245,158,11,0.4)}
.intel-badge.badge-ref{background:var(--blue-dim);color:var(--blue-light);border:1px solid rgba(0,102,255,0.35)}

.intel-alert-box.alert-pass{background:rgba(16,185,129,0.08);border:1px solid rgba(16,185,129,0.22);border-radius:8px;padding:9px 12px}
.intel-alert-box.alert-warning{background:rgba(245,158,11,0.1);border:1px solid rgba(245,158,11,0.35);border-radius:8px;padding:9px 12px}
.intel-alert-title{font-size:11.5px;font-weight:700;margin-bottom:3px;color:#10B981}
.intel-alert-box.alert-warning .intel-alert-title{color:#F59E0B}
.intel-alert-desc{font-size:11px;color:var(--text);line-height:1.45;margin:0}
.intel-alert-subtext{font-size:10px;color:var(--muted);margin-top:3px}
.intel-alert-list{margin:4px 0 5px;padding-left:17px;font-size:11px;color:var(--text);line-height:1.45}
.intel-alert-list li{margin:2px 0}
.intel-alert-tip{font-size:10px;color:#F59E0B;font-style:italic;margin-top:4px}
.intel-confidence-strip{display:flex;align-items:center;gap:6px;margin-top:6px;font-size:10px;color:var(--muted)}
.intel-confidence-strip .ic-dot{width:6px;height:6px;border-radius:50%;background:#10B981;flex-shrink:0}

.intel-eq-box{background:rgba(0,102,255,0.08);border:1px solid rgba(0,102,255,0.22);border-radius:8px;padding:9px 12px}
.intel-eq-label{font-size:9.5px;text-transform:uppercase;letter-spacing:0.6px;font-weight:700;color:var(--muted);margin-bottom:3px}
.intel-eq-code{font-family:var(--mono);font-size:11.5px;font-weight:600;color:var(--blue-light);line-height:1.45;white-space:pre-wrap;word-break:break-word}
.intel-eq-steps{margin-top:5px;padding-top:5px;border-top:1px dashed rgba(0,102,255,0.2)}
.intel-step-line{font-family:var(--mono);font-size:11px;color:var(--text);line-height:1.45}
.intel-inputs-summary{margin-top:7px;padding-top:7px;border-top:1px solid rgba(255,255,255,0.06)}
body.light-mode .intel-inputs-summary{border-top-color:rgba(0,0,0,0.08)}
.intel-inputs-title{font-size:10px;font-weight:600;color:var(--muted);margin-bottom:5px}
.intel-inputs-chips{display:flex;flex-wrap:wrap;gap:4px}
.intel-input-chip{font-size:10px;background:rgba(255,255,255,0.05);border:1px solid var(--navy-border);padding:2px 6px;border-radius:5px;color:var(--text)}
body.light-mode .intel-input-chip{background:#fff;border-color:#cbd5e1}

.intel-basis-desc{font-size:11px;color:var(--muted);line-height:1.45}
.intel-sub-title{font-size:10px;font-weight:700;letter-spacing:0.5px;text-transform:uppercase;color:var(--text);margin:5px 0 3px}
.intel-assumptions-list ul{margin:0;padding-left:16px;font-size:11px;color:var(--text);line-height:1.5}
.intel-assumptions-list li{margin:2px 0}
.intel-standards-chips{display:flex;flex-direction:column;gap:4px;margin-top:4px}
.intel-std-tag{font-size:10px;display:flex;align-items:baseline;gap:6px;background:rgba(0,102,255,0.07);border:1px solid rgba(0,102,255,0.2);border-radius:5px;padding:3px 7px}
.intel-std-tag strong{color:var(--blue-light);flex-shrink:0}
.intel-std-tag span{color:var(--muted);font-size:9.5px}
.intel-disclaimer-note{font-size:9.5px;color:var(--muted);line-height:1.35;margin-top:4px;padding-top:5px;border-top:1px solid rgba(255,255,255,0.05)}
.intel-placeholder{font-size:11px;color:var(--muted);font-style:italic;padding:4px}

body.light-mode .modal-intel-col{background:#fff!important;border-color:var(--navy-border)!important}

@media(max-width:1200px){
  .modal-body{flex-wrap:wrap!important}
  .modal-inputs{flex:1 1 48%!important;max-height:58vh!important}
  .mep-rescol{flex:1 1 48%!important;max-width:none!important;max-height:58vh!important}
  .modal-intel-col{flex:1 1 100%!important;max-height:45vh!important}
}
@media(max-width:768px){
  .modal-body{flex-direction:column!important}
  .modal-inputs,.mep-rescol,.modal-intel-col{flex:1 1 100%!important;width:100%!important;max-width:100%!important;max-height:none!important}
}
#modal-overlay{display:none!important}