/* ===========================================================
   CalcHeure — Premium redesign
   Drop-in replacement for /assets/css/style.css
   Keeps every class name compatible with index.html.
   =========================================================== */

:root{
  /* Deep, layered dark base */
  --bg:#070a12;
  --bg-2:#0b1020;
  --surface:#0f1524;
  --surface-2:#131a2c;
  --card:#161e33;
  --card-2:#1c2540;
  --border:rgba(148,163,184,.14);
  --border-strong:rgba(148,163,184,.22);

  --accent:#6aa3ff;
  --accent-2:#8b7dff;
  --accent-3:#22d3ee;
  --success:#34d399;
  --warning:#fbbf24;
  --danger:#f87171;

  --text:#e7ecf5;
  --muted:#9aa6bd;
  --light:#ffffff;

  --grad-brand:linear-gradient(135deg,#6aa3ff 0%,#8b7dff 55%,#c084fc 100%);
  --grad-brand-soft:linear-gradient(135deg,rgba(106,163,255,.18),rgba(139,125,255,.16));
  --grad-bg:
    radial-gradient(1100px 600px at 80% -10%,rgba(139,125,255,.18),transparent 60%),
    radial-gradient(900px 520px at 0% 10%,rgba(34,211,238,.10),transparent 55%),
    radial-gradient(700px 400px at 50% 100%,rgba(106,163,255,.10),transparent 60%);

  --shadow-sm:0 1px 2px rgba(0,0,0,.35);
  --shadow:0 18px 50px rgba(2,6,23,.55), 0 2px 6px rgba(2,6,23,.35);
  --shadow-glow:0 0 0 1px rgba(106,163,255,.25), 0 30px 80px -20px rgba(106,163,255,.35);

  --radius:14px;
  --radius-lg:20px;
  --radius-xl:26px;

  --fh:'Space Grotesk',ui-sans-serif,system-ui,sans-serif;
  --fb:'Inter',ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
}

[data-theme="light"]{
  --bg:#f7f8fb;
  --bg-2:#eef1f7;
  --surface:#ffffff;
  --surface-2:#f6f8fc;
  --card:#f1f4fa;
  --card-2:#e9eef7;
  --border:rgba(15,23,42,.08);
  --border-strong:rgba(15,23,42,.14);
  --text:#0f172a;
  --muted:#5b6678;
  --light:#0b1220;
  --grad-bg:
    radial-gradient(1100px 600px at 80% -10%,rgba(139,125,255,.18),transparent 60%),
    radial-gradient(900px 520px at 0% 10%,rgba(34,211,238,.14),transparent 55%),
    radial-gradient(700px 400px at 50% 100%,rgba(106,163,255,.14),transparent 60%);
  --shadow:0 18px 50px rgba(15,23,42,.10), 0 2px 6px rgba(15,23,42,.06);
  --shadow-glow:0 0 0 1px rgba(106,163,255,.25), 0 30px 80px -20px rgba(106,163,255,.30);
}

/* ---------- Reset / base ---------- */
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  background:var(--bg);
  background-image:var(--grad-bg);
  background-attachment:fixed;
  color:var(--text);
  font-family:var(--fb);
  font-size:16px;
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  font-feature-settings:"ss01","cv11";
}
a{color:var(--accent);text-decoration:none;transition:color .2s}
a:hover{color:#a7c4ff;text-decoration:none}
img,svg{max-width:100%;height:auto;display:block}
::selection{background:rgba(139,125,255,.35);color:#fff}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:10px}

.skip-link{position:absolute;top:-48px;left:16px;background:var(--accent);color:#fff;padding:10px 14px;border-radius:10px;z-index:999}
.skip-link:focus{top:14px}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}

/* ---------- Header ---------- */
.site-header{
  position:sticky;top:0;z-index:200;
  background:color-mix(in oklab,var(--bg) 70%,transparent);
  backdrop-filter:saturate(160%) blur(18px);
  -webkit-backdrop-filter:saturate(160%) blur(18px);
  border-bottom:1px solid var(--border);
}
.nav-inner{max-width:1200px;margin:0 auto;display:flex;align-items:center;gap:16px;min-height:72px;padding:0 24px}
.logo{font-family:var(--fh);font-size:1.25rem;font-weight:800;letter-spacing:-.01em;white-space:nowrap;background:var(--grad-brand);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.logo a{color:inherit}
.desktop-nav{display:flex;align-items:center;gap:2px;flex:1;flex-wrap:wrap}
.desktop-nav a{
  position:relative;
  color:var(--muted);font-size:.9rem;font-weight:600;
  padding:9px 14px;border-radius:10px;letter-spacing:.005em;
  transition:color .2s,background .2s;
}
.desktop-nav a:hover{color:var(--text);background:color-mix(in oklab,var(--card) 80%,transparent)}
.desktop-nav a.active{color:var(--text)}
.desktop-nav a.active::after{
  content:"";position:absolute;left:14px;right:14px;bottom:4px;height:2px;border-radius:2px;
  background:var(--grad-brand);
}
.nav-cta{
  background:var(--grad-brand)!important;color:#fff!important;margin-left:auto;
  padding:10px 16px!important;font-weight:700!important;
  box-shadow:0 8px 22px -8px rgba(139,125,255,.6);
}
.nav-cta::after{display:none!important}
.nav-cta:hover{filter:brightness(1.08);transform:translateY(-1px)}
.theme-btn,.hamburger{
  background:color-mix(in oklab,var(--card) 80%,transparent);
  border:1px solid var(--border);color:var(--text);
  border-radius:11px;cursor:pointer;transition:background .2s,border-color .2s;
}
.theme-btn{padding:9px 12px;font-size:1rem}
.theme-btn:hover,.hamburger:hover{border-color:var(--border-strong)}
.hamburger{display:none;padding:9px}
.hamburger svg{width:22px;height:22px}
.mobile-nav{display:none;flex-direction:column;padding:14px 20px 20px;border-top:1px solid var(--border);background:color-mix(in oklab,var(--surface) 92%,transparent);backdrop-filter:blur(14px)}
.mobile-nav.open{display:flex}
.mobile-nav a{color:var(--muted);font-weight:600;padding:12px 12px;border-radius:10px}
.mobile-nav a:hover,.mobile-nav a.active{color:var(--text);background:var(--card)}

/* ---------- Hero ---------- */
.hero{
  position:relative;
  padding:96px 22px 64px;
  text-align:center;
  overflow:hidden;
}
.hero::before{
  content:"";position:absolute;inset:-1px;z-index:-1;
  background:
    radial-gradient(ellipse 70% 50% at 50% 0%,rgba(139,125,255,.28),transparent 65%),
    radial-gradient(ellipse 60% 40% at 80% 10%,rgba(34,211,238,.18),transparent 70%);
  pointer-events:none;
}
.hero::after{
  content:"";position:absolute;left:0;right:0;bottom:-1px;height:1px;
  background:linear-gradient(90deg,transparent,var(--border-strong),transparent);
}
.hero.narrow{padding-bottom:48px}
/* ===== Live clock ===== */
.live-clock {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--card);
  border: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.85rem;
  font-weight: 600;
  padding: 7px 16px;
  border-radius: 999px;
  margin-bottom: 28px;
}
.live-clock span:first-of-type { color: var(--text); letter-spacing: 0.04em; }
.live-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--success);
  box-shadow: 0 0 0 0 rgba(34,197,94,0.6);
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0%   { box-shadow: 0 0 0 0 rgba(34,197,94,0.6); }
  70%  { box-shadow: 0 0 0 8px rgba(34,197,94,0); }
  100% { box-shadow: 0 0 0 0 rgba(34,197,94,0); }
}

/* ===== Hero stats ===== */
.hero-stats {
  display: flex;
  gap: 36px;
  justify-content: center;
  margin-top: 44px;
  flex-wrap: wrap;
}
.hero-stat { text-align: center; }
.hero-stat strong {
  display: block;
  font-family: var(--fh);
  font-size: 1.7rem;
  font-weight: 700;
  background: linear-gradient(135deg, #60a5fa, #a78bfa);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero-stat span { color: var(--muted); font-size: 0.82rem; }

/* ===== Stats band ===== */
.stats-band { max-width: 1200px; margin: 0 auto; padding: 0 24px 8px; }
.stats-inner {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  background: linear-gradient(135deg, var(--surface), var(--bg-2));
  border: 1px solid var(--border);
  border-radius: 22px;
  padding: 28px 24px;
  box-shadow: 0 20px 50px rgba(0,0,0,0.18);
}
.stat-item {
  display: flex;
  align-items: center;
  gap: 14px;
  justify-content: center;
  color: #60a5fa;
}
.stat-item div { display: flex; flex-direction: column; }
.stat-item strong {
  font-family: var(--fh);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text);
  line-height: 1.1;
}
.stat-item span { color: var(--muted); font-size: 0.82rem; }
@media (max-width: 720px) {
  .stats-inner { grid-template-columns: repeat(2,1fr); gap: 22px 12px; }
}
@media (max-width: 420px) {
  .stats-inner { grid-template-columns: 1fr; }
}
.hero-eyebrow{
  display:inline-flex;gap:8px;align-items:center;
  background:color-mix(in oklab,var(--surface) 70%,transparent);
  border:1px solid var(--border-strong);
  color:#c7d3ee;font-size:.74rem;font-weight:700;letter-spacing:.14em;text-transform:uppercase;
  padding:7px 16px;border-radius:999px;margin-bottom:24px;
  backdrop-filter:blur(8px);
  box-shadow:0 1px 0 rgba(255,255,255,.04) inset, 0 10px 30px -15px rgba(139,125,255,.6);
}
.hero h1{
  font-family:var(--fh);
  font-size:clamp(2.1rem,5.4vw,4rem);
  line-height:1.04;
  font-weight:800;
  letter-spacing:-.025em;
  max-width:980px;margin:0 auto 20px;
  color:var(--light);
  text-align:center;
}
.hero h1 span{
  background:var(--grad-brand);
  -webkit-background-clip:text;
  background-clip:text;
  -webkit-text-fill-color:transparent;
  display:inline-block;
}
.hero p{max-width:740px;margin:0 auto;color:var(--muted);font-size:1.08rem}
.hero-actions{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;margin-top:32px}

/* ---------- Buttons ---------- */
.btn{
  position:relative;
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  border-radius:12px;padding:13px 20px;
  font-weight:700;font-family:var(--fb);font-size:.95rem;letter-spacing:.005em;
  border:1px solid var(--border-strong);cursor:pointer;
  transition:transform .2s,box-shadow .2s,background .2s,border-color .2s;
}
.btn-primary{
  background:var(--grad-brand);color:#fff;border-color:transparent;
  box-shadow:0 10px 30px -10px rgba(139,125,255,.6), inset 0 1px 0 rgba(255,255,255,.18);
}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 18px 40px -12px rgba(139,125,255,.7), inset 0 1px 0 rgba(255,255,255,.22);color:#fff}
.btn-secondary{background:color-mix(in oklab,var(--surface) 70%,transparent);color:var(--text);backdrop-filter:blur(8px)}
.btn-secondary:hover{transform:translateY(-2px);border-color:var(--accent)}

/* ---------- Layout ---------- */
.container,section{max-width:1200px;margin:0 auto;padding:80px 22px}
.section-compact{padding-top:42px}
.section-divider{border:0;border-top:1px solid var(--border);max-width:1156px;margin:0 auto}
.section-head{text-align:center;margin-bottom:52px}
.section-head h2{
  font-family:var(--fh);
  font-size:clamp(1.7rem,3vw,2.5rem);
  line-height:1.15;margin-bottom:12px;
  letter-spacing:-.02em;color:var(--light);font-weight:800;
}
.section-head p{color:var(--muted);max-width:680px;margin:0 auto;font-size:1.02rem}

/* ---------- Grid + Cards ---------- */
.grid{display:grid;gap:22px}
.grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid-4{grid-template-columns:repeat(4,minmax(0,1fr))}

.card{
  position:relative;
  background:linear-gradient(180deg,color-mix(in oklab,var(--surface) 96%,transparent),color-mix(in oklab,var(--surface-2) 96%,transparent));
  border:1px solid var(--border);
  border-radius:var(--radius-lg);
  padding:26px;
  transition:transform .25s,border-color .25s,box-shadow .25s;
  isolation:isolate;
}
.card::before{
  content:"";position:absolute;inset:0;border-radius:inherit;padding:1px;
  background:linear-gradient(135deg,rgba(106,163,255,.0),rgba(139,125,255,.0));
  -webkit-mask:linear-gradient(#000 0 0) content-box,linear-gradient(#000 0 0);
  -webkit-mask-composite:xor;
  mask:linear-gradient(#000 0 0) content-box,linear-gradient(#000 0 0);
  mask-composite:exclude;
  pointer-events:none;transition:background .25s;
}
.card:hover{transform:translateY(-4px);border-color:var(--border-strong);box-shadow:var(--shadow)}
.card:hover::before{background:linear-gradient(135deg,rgba(106,163,255,.55),rgba(139,125,255,.45) 60%,rgba(34,211,238,.4))}
.card h3{font-family:var(--fh);font-size:1.08rem;line-height:1.3;margin-bottom:8px;letter-spacing:-.005em;color:var(--light)}
.card p,.card li{color:var(--muted);font-size:.95rem}
.card ul{padding-left:18px;margin-top:10px}

.icon-badge{
  width:52px;height:52px;border-radius:14px;
  background:var(--grad-brand-soft);
  border:1px solid var(--border-strong);
  display:flex;align-items:center;justify-content:center;
  font-size:1.5rem;margin-bottom:16px;
  box-shadow:inset 0 1px 0 rgba(255,255,255,.06);
}

.ad-slot{
  max-width:970px;min-height:96px;margin:36px auto 0;
  border:1px dashed var(--border-strong);border-radius:18px;
  background:color-mix(in oklab,var(--surface) 50%,transparent);
  display:flex;align-items:center;justify-content:center;text-align:center;
  color:var(--muted);font-size:.84rem;padding:16px;
}
.ad-slot small{display:block;color:var(--muted)}

/* ---------- Calculator ---------- */
.calc-box{
  position:relative;
  max-width:920px;margin:0 auto;
  background:linear-gradient(180deg,color-mix(in oklab,var(--surface) 98%,transparent),color-mix(in oklab,var(--surface-2) 98%,transparent));
  border:1px solid var(--border-strong);
  border-radius:var(--radius-xl);
  box-shadow:var(--shadow);
  overflow:visible;
  padding:28px;
}
.calc-box::before{
  content:"";position:absolute;inset:0;border-radius:inherit;padding:1px;
  background:linear-gradient(135deg,rgba(106,163,255,.5),rgba(139,125,255,.3) 50%,rgba(34,211,238,.4));
  -webkit-mask:linear-gradient(#000 0 0) content-box,linear-gradient(#000 0 0);
  -webkit-mask-composite:xor;
  mask:linear-gradient(#000 0 0) content-box,linear-gradient(#000 0 0);
  mask-composite:exclude;pointer-events:none;opacity:.6;
}
.calc-box+.calc-box{margin-top:24px}

.calc-tabs{
  display:flex;overflow-x:auto;scrollbar-width:none;
  background:color-mix(in oklab,var(--bg-2) 70%,transparent);
  border-bottom:1px solid var(--border);
}
.calc-tabs::-webkit-scrollbar{display:none}
.calc-tab{
  position:relative;flex:1;min-width:160px;
  background:transparent;border:0;
  color:var(--muted);font-family:var(--fb);font-size:.9rem;font-weight:700;
  cursor:pointer;padding:18px 14px;white-space:nowrap;
  transition:color .2s,background .2s;
}
.calc-tab:hover{color:var(--text)}
.calc-tab.active{color:var(--light);background:transparent}
.calc-tab.active::after{
  content:"";position:absolute;left:18%;right:18%;bottom:0;height:2.5px;border-radius:2px;
  background:var(--grad-brand);box-shadow:0 0 18px rgba(139,125,255,.6);
}

.calc-panel{display:none;padding:44px 34px 34px}
.calc-panel.active{display:block;animation:fadeUp .3s ease}
.panel-title{font-family:var(--fh);font-size:1.15rem;font-weight:700;margin-bottom:22px;letter-spacing:-.005em;color:var(--light)}

.time-rows{display:flex;flex-direction:column;gap:14px;margin-bottom:20px}
.time-row{
  display:flex;align-items:center;gap:14px;
  background:color-mix(in oklab,var(--card) 70%,transparent);
  border:1px solid var(--border);
  border-radius:14px;padding:14px 16px;
  transition:border-color .2s,background .2s;
}
.time-row:focus-within{border-color:var(--accent);background:color-mix(in oklab,var(--card) 90%,transparent)}
.row-label{font-size:.7rem;color:var(--muted);font-weight:800;letter-spacing:.12em;text-transform:uppercase;width:74px;flex-shrink:0}

.time-inputs{display:flex;align-items:center;gap:8px;flex:1;flex-wrap:wrap}
.field-wrap{display:flex;flex-direction:column;align-items:center}

.time-inputs input,
.field-group input,
.field-group select,
.field-group textarea{
  background:color-mix(in oklab,var(--bg-2) 80%,transparent);
  border:1px solid var(--border);
  border-radius:11px;color:var(--text);
  font-family:var(--fh);font-weight:600;
  outline:none;
  transition:border-color .2s,box-shadow .2s,background .2s;
}
.time-inputs input{width:78px;padding:10px 8px;text-align:center;font-size:1.3rem;letter-spacing:-.01em}
.field-group input,.field-group select,.field-group textarea{width:100%;padding:14px 15px;font-size:1rem}
.field-group textarea{min-height:120px;resize:vertical;font-family:var(--fb);font-weight:500}

.time-inputs input:focus,
.field-group input:focus,
.field-group select:focus,
.field-group textarea:focus{
  border-color:var(--accent);
  box-shadow:0 0 0 4px rgba(106,163,255,.16);
  background:color-mix(in oklab,var(--bg-2) 95%,transparent);
}
.time-inputs input.invalid{border-color:var(--danger);box-shadow:0 0 0 4px rgba(248,113,113,.14)}

.sep{color:var(--muted);font-size:1.25rem;font-weight:800;opacity:.6}
.time-unit{font-size:.66rem;color:var(--muted);margin-top:4px;letter-spacing:.08em;text-transform:uppercase;font-weight:700}

.op-row{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:20px;flex-wrap:wrap}
.add-row-btn,.op-btn,.del-btn{font-family:var(--fb);border-radius:12px;cursor:pointer;font-weight:700;transition:all .2s}
.add-row-btn{
  background:color-mix(in oklab,var(--card) 60%,transparent);
  border:1px dashed var(--border-strong);
  color:var(--accent);padding:10px 16px;
}
.add-row-btn:hover{border-color:var(--accent);background:color-mix(in oklab,var(--accent) 12%,transparent);color:#fff}

.op-selector{display:flex;gap:8px}
.op-btn{
  padding:10px 22px;
  background:color-mix(in oklab,var(--card) 70%,transparent);
  border:1px solid var(--border);
  color:var(--muted);font-family:var(--fh);font-size:1.15rem;
}
.op-btn:hover{color:var(--text);border-color:var(--border-strong)}
.op-btn.active{
  background:var(--grad-brand);border-color:transparent;color:#fff;
  box-shadow:0 8px 22px -8px rgba(139,125,255,.65);
}

.del-btn{margin-left:auto;background:transparent;border:0;color:var(--muted);font-size:1rem;padding:8px}
.del-btn:hover{color:var(--danger)}

.calc-actions{display:flex;gap:12px;margin:24px 0 28px}
.btn-calc,.btn-reset{
  border-radius:14px;padding:16px;border:0;cursor:pointer;
  font-weight:800;font-family:var(--fh);font-size:1rem;letter-spacing:.005em;
  transition:transform .2s,box-shadow .2s,background .2s;
}
.btn-calc{
  flex:2;background:var(--grad-brand);color:#fff;
  box-shadow:0 14px 34px -12px rgba(139,125,255,.65), inset 0 1px 0 rgba(255,255,255,.2);
}
.btn-calc:hover{transform:translateY(-2px);box-shadow:0 20px 44px -12px rgba(139,125,255,.75), inset 0 1px 0 rgba(255,255,255,.25)}
.btn-reset{
  flex:1;background:color-mix(in oklab,var(--card) 70%,transparent);
  border:1px solid var(--border-strong);color:var(--muted);
}
.btn-reset:hover{color:var(--text);border-color:var(--border-strong)}
.btn-calc.loading{opacity:.7;pointer-events:none}

.result-box{
  display:none;position:relative;text-align:center;
  border:1px solid rgba(52,211,153,.35);
  background:
    radial-gradient(ellipse 80% 60% at 50% 0%,rgba(52,211,153,.18),transparent 70%),
    linear-gradient(135deg,rgba(52,211,153,.08),rgba(106,163,255,.08));
  border-radius:20px;padding:34px 22px;
  overflow:hidden;
}
.result-box::before{
  content:"";position:absolute;inset:0;border-radius:inherit;
  background:radial-gradient(ellipse 60% 40% at 50% 100%,rgba(106,163,255,.18),transparent 70%);
  pointer-events:none;
}
.result-box.show{display:block;animation:fadeUp .35s ease}
.result-label{font-size:.72rem;text-transform:uppercase;letter-spacing:.18em;color:var(--muted);font-weight:800;margin-bottom:10px}
.result-main{
  font-family:var(--fh);
  font-size:clamp(2.2rem,6vw,3.6rem);
  font-weight:800;color:var(--text);
  line-height:1.05;letter-spacing:-.02em;
  background:linear-gradient(135deg,#1b1f3b,#3a4a8c);
  -webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;
}
.result-sub{margin-top:12px;color:var(--muted);font-size:.95rem;position:relative}
.result-sub span{color:#a7c4ff;font-weight:800}
.result-main-timer{font-size:clamp(3rem,10vw,5.5rem)}
.copy-btn{
  position:absolute;top:14px;right:14px;
  background:color-mix(in oklab,var(--card) 80%,transparent);
  border:1px solid var(--border-strong);color:var(--text);
  border-radius:10px;padding:7px 12px;cursor:pointer;font-weight:700;font-size:.78rem;
  transition:background .2s,border-color .2s;
}
.copy-btn:hover{border-color:var(--accent);color:#fff;background:color-mix(in oklab,var(--accent) 18%,transparent)}

.convert-grid,.diff-cols,.form-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px;margin-bottom:20px}
.field-group label{display:block;color:var(--muted);font-size:.72rem;text-transform:uppercase;letter-spacing:.12em;font-weight:800;margin-bottom:10px}
.convert-results{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:14px}
.conv-item{
  background:color-mix(in oklab,var(--card) 75%,transparent);
  border:1px solid var(--border);
  border-radius:16px;text-align:center;padding:20px 14px;
  transition:transform .2s,border-color .2s;
}
.conv-item:hover{transform:translateY(-2px);border-color:var(--border-strong)}
.conv-val{font-family:var(--fh);font-size:1.55rem;font-weight:800;color:var(--light);word-break:break-word;letter-spacing:-.01em}
.conv-unit{font-size:.78rem;color:var(--muted);margin-top:4px;letter-spacing:.06em;text-transform:uppercase;font-weight:600}
.error-msg{display:none;color:#fda4af;font-size:.88rem;margin:0 0 10px}

/* ---------- Examples / steps ---------- */
.example-box{
  background:linear-gradient(180deg,color-mix(in oklab,var(--surface) 96%,transparent),color-mix(in oklab,var(--surface-2) 96%,transparent));
  border:1px solid var(--border);
  border-radius:var(--radius-lg);padding:24px;
}
.example-box h3{font-family:var(--fh);margin-bottom:14px;font-size:1.05rem;color:var(--light);letter-spacing:-.005em}
.example-list{display:grid;gap:10px;list-style:none}
.example-list li{
  list-style:none;
  background:color-mix(in oklab,var(--bg-2) 70%,transparent);
  border:1px solid var(--border);border-radius:12px;
  padding:13px 16px;color:var(--muted);font-size:.93rem;
}
.example-list strong{color:var(--text);font-weight:700}

.steps{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:20px}
.step{
  background:linear-gradient(180deg,color-mix(in oklab,var(--surface) 96%,transparent),color-mix(in oklab,var(--surface-2) 96%,transparent));
  border:1px solid var(--border);border-radius:var(--radius-lg);padding:26px;
  transition:transform .2s,border-color .2s;
}
.step:hover{transform:translateY(-3px);border-color:var(--border-strong)}
.step-num{
  width:42px;height:42px;border-radius:12px;
  background:var(--grad-brand);
  display:flex;align-items:center;justify-content:center;
  font-family:var(--fh);font-weight:800;color:#fff;margin-bottom:14px;
  box-shadow:0 10px 24px -10px rgba(139,125,255,.65), inset 0 1px 0 rgba(255,255,255,.25);
}
.step h3{font-family:var(--fh);font-size:1.02rem;margin-bottom:6px;color:var(--light)}
.step p{color:var(--muted);font-size:.93rem}

/* ---------- FAQ ---------- */
.faq-list{max-width:840px;margin:0 auto;display:grid;gap:12px}
.faq-item{
  background:linear-gradient(180deg,color-mix(in oklab,var(--surface) 96%,transparent),color-mix(in oklab,var(--surface-2) 96%,transparent));
  border:1px solid var(--border);
  border-radius:16px;overflow:hidden;
  transition:border-color .2s;
}
.faq-item:hover{border-color:var(--border-strong)}
.faq-item.open{border-color:rgba(106,163,255,.4)}
.faq-q{
  width:100%;background:transparent;border:0;color:var(--text);
  display:flex;align-items:center;justify-content:space-between;gap:14px;
  padding:20px 22px;cursor:pointer;text-align:left;
  font-family:var(--fh);font-weight:700;font-size:1rem;letter-spacing:-.005em;
}
.faq-q:hover{color:var(--accent)}
.faq-chevron{color:var(--muted);transition:transform .25s}
.faq-item.open .faq-chevron{transform:rotate(180deg);color:var(--accent)}
.faq-a{display:none;padding:0 22px 20px;color:var(--muted);font-size:.95rem;line-height:1.75}
.faq-item.open .faq-a{display:block;animation:fadeUp .25s ease}

/* ---------- Blog / Tools ---------- */
.blog-grid,.tools-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(270px,1fr));gap:22px}
.blog-card,.tool-card{
  display:block;
  background:linear-gradient(180deg,color-mix(in oklab,var(--surface) 96%,transparent),color-mix(in oklab,var(--surface-2) 96%,transparent));
  border:1px solid var(--border);
  border-radius:20px;overflow:hidden;color:var(--text);
  transition:transform .25s,border-color .25s,box-shadow .25s;
}
.blog-card:hover,.tool-card:hover{transform:translateY(-4px);border-color:var(--border-strong);box-shadow:var(--shadow)}
.blog-thumb{
  height:140px;display:flex;align-items:center;justify-content:center;font-size:3rem;
  background:
    radial-gradient(ellipse at 30% 30%,rgba(106,163,255,.3),transparent 60%),
    radial-gradient(ellipse at 70% 70%,rgba(139,125,255,.28),transparent 60%),
    linear-gradient(135deg,rgba(106,163,255,.15),rgba(99,102,241,.15));
  border-bottom:1px solid var(--border);
}
.blog-body,.tool-card{padding:22px}
.blog-tag{font-size:.7rem;text-transform:uppercase;letter-spacing:.14em;color:var(--accent);font-weight:800;margin-bottom:10px}
.blog-body h3,.tool-card h3{font-family:var(--fh);font-size:1.08rem;line-height:1.3;margin-bottom:8px;color:var(--light);letter-spacing:-.005em}
.blog-body p,.tool-card p{color:var(--muted);font-size:.93rem}
.blog-meta{margin-top:14px;color:var(--muted);font-size:.8rem;opacity:.85}
.read-more{display:inline-block;margin-top:14px;font-size:.88rem;font-weight:700;color:var(--accent)}
.read-more::after{content:"";display:inline-block;margin-left:6px;transition:transform .2s}
.blog-card:hover .read-more::after{transform:translateX(3px)}
.tool-card{text-align:left}
.tool-icon{
  width:54px;height:54px;border-radius:14px;
  background:var(--grad-brand-soft);border:1px solid var(--border-strong);
  display:flex;align-items:center;justify-content:center;
  font-size:1.6rem;margin-bottom:14px;
}

/* ---------- Article layout ---------- */
.article-layout{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:32px;align-items:start}
.article-content{
  background:linear-gradient(180deg,color-mix(in oklab,var(--surface) 96%,transparent),color-mix(in oklab,var(--surface-2) 96%,transparent));
  border:1px solid var(--border);
  border-radius:24px;padding:38px;
}
.article-content h2,.article-content h3{font-family:var(--fh);line-height:1.25;margin:32px 0 12px;color:var(--light);letter-spacing:-.01em}
.article-content h2:first-child,.article-content h3:first-child{margin-top:0}
.article-content p,.article-content li{color:var(--muted);margin-bottom:14px}
.article-content ul,.article-content ol{padding-left:24px}
.article-content .lead{font-size:1.1rem;color:var(--text);line-height:1.7}
.article-content table{width:100%;border-collapse:collapse;margin:22px 0;border-radius:14px;overflow:hidden;border:1px solid var(--border)}
.article-content th,.article-content td{border-bottom:1px solid var(--border);padding:14px;text-align:left}
.article-content th{background:color-mix(in oklab,var(--card) 70%,transparent);font-family:var(--fh);color:var(--light)}

.author-box{
  display:flex;gap:14px;align-items:center;
  background:color-mix(in oklab,var(--card) 75%,transparent);
  border:1px solid var(--border);border-radius:16px;
  padding:18px;margin-top:30px;
}
.author-avatar{
  width:50px;height:50px;border-radius:50%;
  display:flex;align-items:center;justify-content:center;
  background:var(--grad-brand);font-size:1.3rem;flex-shrink:0;color:#fff;
  box-shadow:inset 0 1px 0 rgba(255,255,255,.2);
}
.author-name{font-family:var(--fh);font-weight:800;color:var(--light)}
.author-role{color:var(--muted);font-size:.86rem}

.sidebar{position:sticky;top:96px;display:grid;gap:20px}
.sidebar-box{
  background:linear-gradient(180deg,color-mix(in oklab,var(--surface) 96%,transparent),color-mix(in oklab,var(--surface-2) 96%,transparent));
  border:1px solid var(--border);border-radius:20px;padding:22px;
}
.sidebar-box h3{font-family:var(--fh);font-size:1.02rem;margin-bottom:12px;color:var(--light)}
.sidebar-box ul{list-style:none;display:grid;gap:10px}
.sidebar-box a{color:var(--muted);font-weight:600;font-size:.92rem;transition:color .2s}
.sidebar-box a:hover{color:var(--accent)}

/* ---------- About / KPI / Tables ---------- */
.about-strip{
  background:
    radial-gradient(ellipse 60% 80% at 0% 50%,rgba(106,163,255,.18),transparent 70%),
    radial-gradient(ellipse 60% 80% at 100% 50%,rgba(139,125,255,.16),transparent 70%),
    color-mix(in oklab,var(--surface) 80%,transparent);
  border:1px solid var(--border-strong);
  border-radius:24px;padding:30px;
}
.kpi-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:18px}
.kpi{
  background:linear-gradient(180deg,color-mix(in oklab,var(--surface) 96%,transparent),color-mix(in oklab,var(--surface-2) 96%,transparent));
  border:1px solid var(--border);border-radius:18px;padding:22px;text-align:center;
  transition:transform .2s,border-color .2s;
}
.kpi:hover{transform:translateY(-3px);border-color:var(--border-strong)}
.kpi strong{
  display:block;font-family:var(--fh);font-size:1.9rem;color:var(--light);
  letter-spacing:-.02em;
  background:linear-gradient(135deg,#fff,#a7c4ff);
  -webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;
}
.kpi span{color:var(--muted);font-size:.86rem;margin-top:4px;display:block}

.table-wrap{overflow-x:auto;border-radius:18px;border:1px solid var(--border)}
.clean-table{width:100%;border-collapse:collapse;min-width:620px}
.clean-table th,.clean-table td{padding:14px 16px;border-bottom:1px solid var(--border);text-align:left}
.clean-table th{background:color-mix(in oklab,var(--card) 70%,transparent);font-family:var(--fh);color:var(--light)}
.clean-table td{color:var(--muted)}
.clean-table tr:last-child td{border-bottom:0}

/* ---------- Footer ---------- */
.site-footer{
  border-top:1px solid var(--border);
  background:color-mix(in oklab,var(--bg-2) 80%,transparent);
  padding:64px 22px 32px;margin-top:40px;
}
.footer-grid{max-width:1200px;margin:0 auto;display:grid;grid-template-columns:2fr repeat(3,1fr);gap:38px}
.footer-brand .logo{font-size:1.3rem}
.footer-brand p{max-width:320px;color:var(--muted);font-size:.92rem;margin-top:12px;line-height:1.7}
.footer-col h4{font-family:var(--fh);font-size:.76rem;text-transform:uppercase;letter-spacing:.14em;color:var(--text);margin-bottom:16px;font-weight:700}
.footer-col ul{list-style:none;display:grid;gap:10px}
.footer-col a{color:var(--muted);font-size:.9rem;transition:color .2s}
.footer-col a:hover{color:var(--accent)}
.footer-bottom{
  max-width:1200px;margin:38px auto 0;border-top:1px solid var(--border);
  padding-top:24px;display:flex;align-items:center;justify-content:space-between;
  gap:16px;flex-wrap:wrap;
}
.footer-bottom p,.footer-bottom a{color:var(--muted);font-size:.86rem}
.footer-links{display:flex;gap:18px;flex-wrap:wrap}

/* ---------- Toast ---------- */
.toast{
  position:fixed;bottom:28px;left:50%;
  transform:translateX(-50%) translateY(80px);
  background:color-mix(in oklab,var(--surface) 92%,transparent);
  backdrop-filter:blur(14px);
  border:1px solid rgba(52,211,153,.4);color:#34d399;
  padding:11px 20px;border-radius:999px;font-size:.88rem;font-weight:800;z-index:999;
  transition:transform .3s cubic-bezier(.2,.9,.3,1.2),opacity .25s;opacity:0;pointer-events:none;
  box-shadow:0 16px 40px -10px rgba(0,0,0,.4);
}
.toast.show{transform:translateX(-50%) translateY(0);opacity:1}

/* ---------- Pct field ---------- */
.pct-field-wrap{
  display:flex;align-items:center;
  background:color-mix(in oklab,var(--bg-2) 80%,transparent);
  border:1px solid var(--border);
  border-radius:11px;overflow:visible;
  transition:border-color .2s,box-shadow .2s;
}
.pct-field-wrap:focus-within{border-color:var(--accent);box-shadow:0 0 0 4px rgba(106,163,255,.16)}
.pct-field-wrap input{flex:1;min-width:0;padding:14px 10px 14px 15px;background:transparent;border:none;outline:none;color:var(--text);font-family:var(--fh);font-weight:600;font-size:1rem}
.pct-unit{padding:0 15px 0 6px;color:var(--muted);font-size:.86rem;white-space:nowrap;user-select:none;font-weight:600}

/* ---------- Animations ---------- */
@keyframes fadeUp{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:none}}
@keyframes shimmer{0%{background-position:-200% 0}100%{background-position:200% 0}}

/* ---------- Responsive ---------- */
@media (max-width:980px){
  .desktop-nav{display:none}
  .hamburger{display:block}
  .theme-btn{margin-left:auto}
  .article-layout{grid-template-columns:1fr}
  .sidebar{position:static}
  .footer-grid{grid-template-columns:1fr 1fr;gap:28px}
  .grid-4,.grid-3{grid-template-columns:repeat(2,minmax(0,1fr))}
  .kpi-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  section,.container{padding:64px 22px}
}
@media (max-width:620px){
  body{font-size:15px}
  .nav-inner{min-height:64px;padding:0 18px}
  .hero{padding:72px 18px 44px}
  .hero-actions{flex-direction:column}
  .btn{width:100%}
  .container,section{padding:52px 18px}
  .section-head{margin-bottom:36px}
  .calc-panel{padding:22px}
  .calc-box{border-radius:20px;padding:20px 18px}
  .calc-tab{min-width:108px;font-size:.76rem;padding:12px 6px;white-space:normal;line-height:1.25}
  .time-row{align-items:flex-start;flex-direction:column;gap:10px}
  .row-label{width:auto}
  .time-inputs input{width:64px;font-size:1.1rem}
  .calc-actions,.op-row{flex-direction:column;align-items:stretch}
  .btn-calc,.btn-reset{width:100%}
  .footer-grid{grid-template-columns:1fr}
  .footer-grid .footer-col:nth-of-type(5){display:none}
  .grid-2,.grid-3,.grid-4{grid-template-columns:1fr}
  .convert-grid,.diff-cols,.form-grid{grid-template-columns:1fr}
  .article-content{padding:24px}
}
/* ---------- Fallback for browsers without color-mix() ---------- */
@supports not (color:color-mix(in oklab,white 50%,transparent)) {
  .site-header,.mobile-nav,.desktop-nav a:hover,.theme-btn,.hamburger,.hero-eyebrow,
  .btn-secondary,.card,.ad-slot,.calc-box,.calc-tabs,.time-row,.time-row:focus-within,
  .time-inputs input,.field-group input,.field-group select,.field-group textarea,
  .add-row-btn,.op-btn,.btn-reset,.copy-btn,.author-box,.example-box,.example-list li,
  .step,.faq-item,.blog-card,.tool-card,.article-content,.sidebar-box,.about-strip,
  .clean-table th,.article-content th,.site-footer,.toast,.pct-field-wrap,.kpi,.conv-item{
    background-color:var(--surface);
    background-image:none;
  }
  .site-header{background-color:var(--bg)}
}
/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.01ms!important;transition-duration:.01ms!important;scroll-behavior:auto!important}
}