/* ScrollTester.studio — shared styles v2
   Type: Inter (UI/body, matches the inspiration site's clean sans-serif)
         JetBrains Mono (live readouts — the "lab instrument" signature)
   Palette: light neutral surface, near-black text, indigo accent,
            dark glowing "readout panel" for live data (signature element)
*/

:root{
  --bg: #F6F7FB;
  --surface: #FFFFFF;
  --border: #E6E9F0;
  --text: #12141C;
  --muted: #6B7280;
  --accent: #3457FF;
  --accent-2: #7C5CFF;
  --accent-dark: #223CC7;
  --accent-soft: #EDF0FF;
  --good: #17A34A;
  --warn: #D97706;
  --bad: #DC2626;
  --panel-bg: #0B0E1A;
  --panel-bg-2: #131832;
  --panel-fg: #7CF4CB;
  --panel-fg-dim: #45577A;
  --panel-line: rgba(124,244,203,0.12);
  --radius: 14px;
  --radius-sm: 8px;
  --max: 1120px;
  --shadow-sm: 0 1px 2px rgba(16,24,40,.04), 0 1px 3px rgba(16,24,40,.06);
  --shadow-md: 0 4px 10px rgba(16,24,40,.06), 0 12px 28px -8px rgba(16,24,40,.10);
  --shadow-lg: 0 20px 45px -12px rgba(30,50,150,.22);
  --ease: cubic-bezier(.22,.61,.36,1);
}

*{ box-sizing: border-box; }
html{ scroll-behavior: smooth; }
body{
  margin:0;
  font-family: 'Inter', system-ui, -apple-system, "Segoe UI", sans-serif;
  color: var(--text);
  background:
    radial-gradient(900px 420px at 85% -10%, rgba(124,92,255,.10), transparent 60%),
    radial-gradient(700px 380px at 0% 0%, rgba(52,87,255,.08), transparent 55%),
    var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img{ max-width:100%; display:block; }
a{ color: var(--accent); text-decoration:none; }
a:hover{ text-decoration:underline; }
h1,h2,h3{ line-height:1.15; letter-spacing:-0.02em; font-weight:700; }
.mono{ font-family: 'JetBrains Mono', ui-monospace, Menlo, Consolas, monospace; }

.wrap{ max-width: var(--max); margin: 0 auto; padding: 0 20px; }

/* ---------- Top nav ---------- */
.site-header{
  background: rgba(255,255,255,.78);
  backdrop-filter: blur(10px) saturate(1.4);
  -webkit-backdrop-filter: blur(10px) saturate(1.4);
  border-bottom: 1px solid var(--border);
  position: sticky; top:0; z-index: 50;
}
.nav{ display:flex; align-items:center; justify-content:space-between; height: 66px; }
.brand{ display:flex; align-items:center; gap:9px; font-weight:800; font-size:1.08rem; color:var(--text); letter-spacing:-0.02em; }
.brand:hover{ text-decoration:none; }
.brand .dot{
  width:10px; height:10px; border-radius:50%;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  box-shadow:0 0 0 5px var(--accent-soft), 0 0 12px rgba(52,87,255,.5);
}
.nav-links{ display:flex; gap:2px; align-items:center; }
.nav-links a{
  color: var(--text); font-weight:600; font-size:.92rem;
  padding:9px 13px; border-radius:999px; transition: all .15s var(--ease);
}
.nav-links a:hover{ background: var(--accent-soft); text-decoration:none; color:var(--accent-dark); }
.nav-links a.active{ color:#fff; background: linear-gradient(135deg, var(--accent), var(--accent-dark)); box-shadow: var(--shadow-sm); }
.nav-links .nav-disabled{
  color: var(--text); opacity:.4; font-weight:600; font-size:.92rem;
  padding:9px 13px; border-radius:999px; cursor:not-allowed; user-select:none;
}
.nav-toggle{ display:none; background:none; border:1px solid var(--border); border-radius:8px; padding:8px 10px; cursor:pointer; }

/* language switcher — reuses native <details> like the FAQ, no extra JS needed */
.lang-switch{ position:relative; margin-left:4px; }
.lang-switch summary{
  list-style:none; cursor:pointer; display:flex; align-items:center; gap:5px;
  border:1px solid var(--border); border-radius:999px; padding:7px 12px; font-size:.82rem; font-weight:600;
  color:var(--text); background:var(--surface); transition: border-color .15s var(--ease);
}
.lang-switch summary::-webkit-details-marker{ display:none; }
.lang-switch summary:hover{ border-color:var(--accent); }
.lang-switch summary::after{ content:'▾'; color:var(--muted); font-size:.7rem; }
.lang-switch .lang-menu{
  position:absolute; top:calc(100% + 6px); right:0; background:var(--surface); border:1px solid var(--border);
  border-radius:10px; box-shadow: var(--shadow-md); padding:6px; min-width:150px; z-index:60;
}
.lang-switch .lang-menu a{
  display:flex; align-items:center; gap:8px; padding:8px 10px; border-radius:8px; font-size:.87rem; color:var(--text); font-weight:500;
}
.lang-switch .lang-menu a:hover{ background:var(--accent-soft); text-decoration:none; }
.lang-switch .lang-menu a.current{ color:var(--accent-dark); font-weight:700; }
@media (max-width: 820px){ .lang-switch{ margin-left:0; margin-top:8px; align-self:flex-start; } }

@media (max-width: 820px){
  .nav-links{
    position:absolute; top:66px; left:0; right:0; background:var(--surface);
    border-bottom:1px solid var(--border); flex-direction:column; align-items:stretch;
    padding:10px; display:none; box-shadow: var(--shadow-md);
  }
  .nav-links.open{ display:flex; }
  .nav-links a{ padding:13px; border-radius:10px; }
  .nav-toggle{ display:inline-flex; }
}

/* ---------- Hero ---------- */
.hero{ padding: 56px 0 10px; position:relative; }
.eyebrow{
  display:inline-flex; align-items:center; gap:6px;
  color: var(--accent-dark); font-weight:700; font-size:.76rem; text-transform:uppercase; letter-spacing:.09em;
  background: var(--accent-soft); padding:5px 12px; border-radius:999px;
}
.hero h1{ font-size: clamp(1.9rem, 3.6vw, 2.9rem); margin:.4em 0 .32em; max-width:18ch; }
.hero p.lede{ color: var(--muted); font-size:1.08rem; max-width: 60ch; }

/* ---------- Tool stage ---------- */
.tool-card{
  background: var(--surface); border:1px solid var(--border); border-radius: var(--radius);
  padding: 24px; margin-top: 26px; box-shadow: var(--shadow-md);
  position:relative; overflow:hidden;
}
.tool-card::before{
  content:''; position:absolute; top:0; left:0; right:0; height:3px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
}
.tool-controls{ display:flex; flex-wrap:wrap; gap:8px; align-items:center; margin-bottom:16px; }
.duration-pill{
  border:1px solid var(--border); background:var(--bg); color:var(--text);
  padding:8px 15px; border-radius:999px; font-size:.85rem; cursor:pointer; font-family:inherit; font-weight:600;
  transition: all .15s var(--ease);
}
.duration-pill:hover{ border-color: var(--accent); }
.duration-pill.active{ background: linear-gradient(135deg, var(--accent), var(--accent-dark)); border-color: var(--accent); color:#fff; box-shadow: var(--shadow-sm); }
.btn{
  border:none; background: linear-gradient(135deg, var(--accent), var(--accent-dark)); color:#fff; padding:11px 20px; border-radius:10px;
  font-weight:700; cursor:pointer; font-size:.92rem; font-family:inherit;
  box-shadow: 0 6px 16px -6px rgba(52,87,255,.55);
  transition: transform .15s var(--ease), box-shadow .15s var(--ease), filter .15s var(--ease);
}
.btn:hover{ transform: translateY(-1px); filter:brightness(1.06); box-shadow: 0 10px 22px -6px rgba(52,87,255,.6); }
.btn:active{ transform: translateY(0); }
.btn.secondary{ background:transparent; color:var(--text); border:1px solid var(--border); box-shadow:none; }
.btn.secondary:hover{ background:var(--bg); filter:none; transform:none; }

.stage{
  margin-top:16px; border:2px dashed var(--border); border-radius: var(--radius);
  min-height: 230px; display:flex; align-items:center; justify-content:center;
  text-align:center; color:var(--muted); background:
    linear-gradient(180deg, #FBFCFF, #F3F5FA);
  cursor:pointer; user-select:none; position:relative; overflow:hidden;
  padding: 26px; transition: border-color .2s var(--ease), background .2s var(--ease);
}
.stage:hover{ border-color:#C9D0E6; }
.stage.active{
  border-style:solid; border-color: var(--accent);
  background: radial-gradient(420px 180px at 50% 30%, var(--accent-soft), #F3F5FA 70%);
  color:var(--accent-dark);
  box-shadow: inset 0 0 0 1px rgba(52,87,255,.15);
}
.stage .stage-hint{ font-size:.87rem; margin-top:8px; color: var(--muted); max-width:44ch; }
.stage .big{ font-size: 2.6rem; font-weight:800; font-family:'JetBrains Mono', monospace; letter-spacing:-0.02em; }

/* readout panel — signature element: dark glowing "instrument" panel */
.readout-panel{
  margin-top:18px; background:
    linear-gradient(180deg, rgba(255,255,255,.03), transparent 40%),
    linear-gradient(135deg, var(--panel-bg-2), var(--panel-bg));
  border-radius: var(--radius);
  padding: 20px; display:grid; grid-template-columns: repeat(auto-fit,minmax(130px,1fr)); gap: 16px;
  box-shadow: var(--shadow-lg), inset 0 0 0 1px var(--panel-line);
  position:relative;
}
.readout{ padding: 4px 2px; border-left: 2px solid var(--panel-line); padding-left:12px; }
.readout .label{ color: var(--panel-fg-dim); font-size:.66rem; text-transform:uppercase; letter-spacing:.09em; font-family:'JetBrains Mono',monospace;}
.readout .value{
  color: var(--panel-fg); font-family:'JetBrains Mono',monospace; font-size:1.4rem; font-weight:700;
  text-shadow: 0 0 14px rgba(124,244,203,.35);
}

/* wave panel — live line-graph trace of input signal, same instrument family as readout-panel */
.wave-panel{
  margin-top:16px; background:
    linear-gradient(180deg, rgba(255,255,255,.03), transparent 40%),
    linear-gradient(135deg, var(--panel-bg-2), var(--panel-bg));
  border-radius: var(--radius); padding: 16px 18px 10px;
  box-shadow: var(--shadow-lg), inset 0 0 0 1px var(--panel-line);
}
.wave-panel-head{ display:flex; align-items:center; justify-content:space-between; margin-bottom:8px; }
.wave-title{ color: var(--panel-fg-dim); font-size:.68rem; text-transform:uppercase; letter-spacing:.09em; font-family:'JetBrains Mono',monospace; }
.wave-legend{ color: var(--panel-fg); font-size:.68rem; font-family:'JetBrains Mono',monospace; display:flex; align-items:center; gap:6px; }
.dot-legend{ width:7px; height:7px; border-radius:50%; background: var(--panel-fg); box-shadow:0 0 8px rgba(124,244,203,.7); display:inline-block; animation: pulse-dot 1.6s ease-in-out infinite; }
@keyframes pulse-dot{ 0%,100%{ opacity:1; } 50%{ opacity:.35; } }
#waveCanvas{ width:100%; height:160px; display:block; }

/* verdict */
.verdict{
  margin-top:18px; border-radius: var(--radius); padding:18px 20px; border:1px solid var(--border);
  background: var(--surface); box-shadow: var(--shadow-sm);
}
.verdict .tag{ display:inline-block; font-size:.72rem; font-weight:800; text-transform:uppercase; letter-spacing:.06em;
  padding:4px 11px; border-radius:999px; margin-bottom:9px; }
.tag.good{ background:#E7F8EE; color:var(--good); }
.tag.warn{ background:#FEF3E2; color:var(--warn); }
.tag.bad{ background:#FDEAEA; color:var(--bad); }

.ad-slot{
  margin: 26px 0; border:1px dashed var(--border); border-radius:var(--radius-sm); padding:16px;
  text-align:center; color: var(--muted); font-size:.72rem; letter-spacing:.08em; text-transform:uppercase;
  background: var(--surface);
}

/* ---------- Content sections ---------- */
.section{ padding: 54px 0; }
.section h2{ font-size:1.6rem; margin-bottom:.4em; }
.section > .wrap > p.lede{ color:var(--muted); margin-top:0; max-width:70ch; }

.steps{ display:grid; grid-template-columns: repeat(auto-fit,minmax(230px,1fr)); gap:18px; margin-top:22px; }
.step{
  background:var(--surface); border:1px solid var(--border); border-radius:var(--radius); padding:20px;
  box-shadow: var(--shadow-sm); transition: transform .18s var(--ease), box-shadow .18s var(--ease);
}
.step:hover{ transform: translateY(-3px); box-shadow: var(--shadow-md); }
.step .num{ font-family:'JetBrains Mono',monospace; color:var(--accent); font-weight:800; font-size:.85rem; }
.step h3{ margin:.5em 0 .3em; font-size:1.04rem; }
.step p{ color:var(--muted); font-size:.92rem; margin:0; }

.metric-grid{ display:grid; grid-template-columns: repeat(auto-fit,minmax(240px,1fr)); gap:16px; margin-top:22px; }
.metric-card{
  border:1px solid var(--border); border-radius:var(--radius); padding:18px; background:var(--surface);
  box-shadow: var(--shadow-sm); transition: transform .18s var(--ease), box-shadow .18s var(--ease);
}
.metric-card:hover{ transform: translateY(-3px); box-shadow: var(--shadow-md); }
.metric-card h3{ font-size:.96rem; margin:0 0 .4em; font-family:'JetBrains Mono',monospace; color:var(--accent-dark); }
.metric-card p{ margin:0; color:var(--muted); font-size:.89rem; }

table.use-table{ width:100%; border-collapse:collapse; margin-top:20px; font-size:.9rem; background:var(--surface); border-radius:var(--radius); overflow:hidden; box-shadow: var(--shadow-sm); }
table.use-table th, table.use-table td{ text-align:left; padding:12px 14px; border-bottom:1px solid var(--border); vertical-align:top; }
table.use-table th{ color:var(--muted); font-weight:700; font-size:.76rem; text-transform:uppercase; letter-spacing:.06em; background: var(--bg); }
table.use-table tr:last-child td{ border-bottom:none; }

.tools-grid{ display:grid; grid-template-columns: repeat(auto-fit,minmax(240px,1fr)); gap:16px; margin-top:22px; }
.tool-link{
  display:block; border:1px solid var(--border); border-radius:var(--radius); padding:18px; background:var(--surface);
  box-shadow: var(--shadow-sm); transition: transform .18s var(--ease), box-shadow .18s var(--ease), border-color .18s var(--ease);
}
.tool-link:hover{ border-color:var(--accent); text-decoration:none; transform: translateY(-3px); box-shadow: var(--shadow-md); }
.tool-link h3{ margin:0 0 .35em; font-size:1.02rem; color:var(--text); }
.tool-link p{ margin:0; color:var(--muted); font-size:.87rem; }

.faq details{ border-bottom:1px solid var(--border); padding:16px 0; }
.faq summary{ cursor:pointer; font-weight:700; list-style:none; display:flex; justify-content:space-between; gap:12px; }
.faq summary::-webkit-details-marker{ display:none; }
.faq summary::after{ content:'+'; color:var(--accent); font-size:1.3rem; line-height:1; transition: transform .15s var(--ease); }
.faq details[open] summary::after{ content:'\2212'; }
.faq p{ color:var(--muted); margin:.7em 0 0; font-size:.94rem; }

.site-footer{ border-top:1px solid var(--border); background:var(--surface); margin-top:50px; padding:38px 0; position:relative; }
.site-footer::before{ content:''; position:absolute; top:-1px; left:0; right:0; height:2px; background: linear-gradient(90deg, var(--accent), var(--accent-2)); }
.footer-grid{ display:flex; flex-wrap:wrap; gap:44px; justify-content:space-between; }
.footer-col h4{ font-size:.78rem; text-transform:uppercase; letter-spacing:.07em; color:var(--muted); margin:0 0 12px; }
.footer-col a{ display:block; color:var(--text); font-size:.9rem; padding:4px 0; }
.footer-col .footer-disabled{ display:block; color:var(--text); opacity:.4; font-size:.9rem; padding:4px 0; cursor:not-allowed; user-select:none; }
.footer-bottom{ margin-top:28px; padding-top:18px; border-top:1px solid var(--border); color:var(--muted); font-size:.82rem; }

@media (prefers-reduced-motion: reduce){ *{ animation:none !important; transition:none !important; } }

/* ---------- RTL support (Arabic) ---------- */
[dir="rtl"] .lang-switch{ margin-left:0; margin-right:4px; }
[dir="rtl"] .lang-switch .lang-menu{ right:auto; left:0; }
[dir="rtl"] .lang-switch summary::after{ content:'▾'; }
[dir="rtl"] table.use-table th, [dir="rtl"] table.use-table td{ text-align:right; }
[dir="rtl"] .step .num{ direction:ltr; display:inline-block; }
[dir="rtl"] .duration-pill, [dir="rtl"] .btn{ direction:ltr; }
[dir="rtl"] .readout, [dir="rtl"] .mono, [dir="rtl"] #waveCanvas{ direction:ltr; }
[dir="rtl"] .faq summary{ flex-direction:row-reverse; }
[dir="rtl"] .tool-controls{ flex-direction:row-reverse; justify-content:flex-end; }
[dir="rtl"] .tool-controls #startBtn{ margin-left:0 !important; margin-right:auto; }
[dir="rtl"] .footer-grid{ flex-direction:row-reverse; }