/* ═══════════════════════════════════════
   TOKENS
   ═══════════════════════════════════════ */
:root {
  --bg: #080808;
  --card: #111111;
  --card2: #161616;
  --line: #1e1e1e;
  --line2: #2a2a2a;
  --t1: #f5f5f5;
  --t2: #888888;
  --t3: #444444;
  --human: #facc15;
  --human-dim: #facc1530;
  --ai: #818cf8;
  --ai-dim: #818cf830;
  --r: 20px;
  --r2: 28px;
  --ease: cubic-bezier(.22,1,.36,1);
  --spring: cubic-bezier(.34,1.56,.64,1);
  --font: 'DM Sans','Estedad',system-ui,sans-serif;
  --display: 'Syne','Estedad',sans-serif;
}
[data-theme="light"] {
  --bg: #f8f7f4;
  --card: #ffffff;
  --card2: #f1f0ed;
  --line: #e8e7e3;
  --line2: #d8d7d3;
  --t1: #111111;
  --t2: #666666;
  --t3: #aaaaaa;
  --human: #ca8a04;
  --human-dim: #ca8a0420;
  --ai: #6366f1;
  --ai-dim: #6366f120;
}

/* ═══════════════════════════════════════
   RESET
   ═══════════════════════════════════════ */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html,body{
  background:var(--bg);color:var(--t1);font-family:var(--font);
  font-size:15px;line-height:1.6;-webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  text-rendering:optimizeLegibility;
  font-feature-settings:"kern" 1,"liga" 1,"calt" 1;
  transition:background .6s var(--ease),color .6s var(--ease);
  overflow-x:hidden;scroll-behavior:smooth;
}

/* Persian-specific typography */
[dir="rtl"]{
  --font:'Estedad','DM Sans',system-ui,sans-serif;
  --display:'Estedad','Syne',sans-serif;
  font-feature-settings:"kern" 1,"liga" 1,"calt" 1,"ss01" 1,"ss02" 1;
  letter-spacing:0;
  word-spacing:-0.02em;
}
[dir="rtl"] body{line-height:1.8}
[dir="rtl"] .go-btn svg{transform:scaleX(-1)}

/* Numeric typography */
.meter-num,.prob-val,.output-info,.brand-ver,.download-badge,.foot-download{
  font-variant-numeric:tabular-nums lining-nums;
  font-feature-settings:"tnum" 1,"lnum" 1;
}
[dir="rtl"] .meter-num,[dir="rtl"] .prob-val,[dir="rtl"] .output-info{
  font-variant-numeric:tabular-nums lining-nums;
  font-feature-settings:"tnum" 1,"lnum" 1;
  letter-spacing:0.03em;
}

.meter-num,.prob-val{
  display:inline-block;
  vertical-align:baseline;
  line-height:1;
}

.meter-num small{
  vertical-align:baseline;
  font-size:0.65em;
  margin-inline-start:1px;
}

a{color:inherit;text-decoration:none}
button{font-family:inherit;cursor:pointer}

/* ═══════════════════════════════════════
   ATMOSPHERE
   ═══════════════════════════════════════ */
.grain{
  position:fixed;inset:0;pointer-events:none;z-index:9999;opacity:.04;mix-blend-mode:overlay;
  background:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='250' height='250'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='4' stitchTiles='stitch'/></filter><rect width='100%25' height='100%25' filter='url(%23n)'/></svg>");
}
.gradient-bg{
  position:fixed;inset:0;z-index:-1;pointer-events:none;
  background:
    radial-gradient(ellipse 60% 50% at 20% 10%,var(--ai-dim),transparent),
    radial-gradient(ellipse 50% 40% at 80% 90%,var(--human-dim),transparent);
  animation:drift 25s ease-in-out infinite alternate;
}
@keyframes drift{
  0%{transform:translate(0,0) scale(1)}
  100%{transform:translate(-30px,20px) scale(1.08)}
}
.vignette{
  position:fixed;inset:0;pointer-events:none;z-index:-1;
  background:radial-gradient(ellipse at center,transparent 40%,rgba(0,0,0,.3) 100%);
}
[data-theme="light"] .vignette{background:radial-gradient(ellipse at center,transparent 40%,rgba(0,0,0,.05) 100%)}

/* ═══════════════════════════════════════
   HEADER
   ═══════════════════════════════════════ */
.header{
  position:sticky;top:0;z-index:100;
  background:color-mix(in srgb,var(--bg) 80%,transparent);
  backdrop-filter:blur(24px) saturate(1.4);
  -webkit-backdrop-filter:blur(24px) saturate(1.4);
  border-bottom:1px solid var(--line);
}
.header-top{
  display:flex;justify-content:space-between;align-items:center;
  padding:10px 32px;border-bottom:1px solid var(--line);
  font-size:12px;
}
.links-bar{display:flex;gap:18px;align-items:center}
.links-bar a{
  color:var(--t2);font-weight:500;
  position:relative;transition:color .25s;
}
.links-bar a::after{
  content:'';position:absolute;bottom:-2px;inset-inline-start:0;
  width:0;height:1px;background:var(--t1);transition:width .3s var(--ease);
}
.links-bar a:hover{color:var(--t1)}
.links-bar a:hover::after{width:100%}
.links-bar .sep{color:var(--t3)}

.header-actions{display:flex;gap:8px}
.pill-btn{
  height:32px;padding:0 14px;display:flex;align-items:center;justify-content:center;gap:6px;
  background:var(--card);border:1px solid var(--line);border-radius:99px;
  color:var(--t2);font-size:12px;font-weight:600;
  transition:all .25s var(--ease);
}
.pill-btn:hover{border-color:var(--line2);color:var(--t1);transform:translateY(-1px)}
[data-theme="dark"] .ico-sun{display:none}
[data-theme="light"] .ico-moon{display:none}

.brand{
  display:flex;align-items:center;gap:12px;
  padding:14px 32px;flex-wrap:wrap;
}
.brand-name{
  font-family:var(--display);font-size:15px;font-weight:700;
  letter-spacing:-.02em;color:var(--t1);
}
[dir="rtl"] .brand-name{letter-spacing:0;font-size:14px}
.brand-ver{
  font-size:10px;font-weight:600;color:var(--t3);
  padding:2px 7px;background:var(--card);border:1px solid var(--line);
  border-radius:5px;letter-spacing:.05em;
}
.download-badge{
  display:inline-flex;align-items:center;gap:5px;
  padding:4px 10px;
  background:var(--human-dim);
  border:1px solid color-mix(in srgb,var(--human) 35%,transparent);
  border-radius:99px;
  font-size:11px;font-weight:600;color:var(--human);
  letter-spacing:.02em;
}
.download-badge svg{flex-shrink:0}

/* ═══════════════════════════════════════
   LAYOUT
   ═══════════════════════════════════════ */
main{max-width:720px;margin:0 auto;padding:0 24px}

/* ═══════════════════════════════════════
   HERO
   ═══════════════════════════════════════ */
.hero{text-align:center;padding:90px 0 60px}
.hero>*{animation:rise .9s var(--ease) both}
.hero-tag{animation-delay:.05s}
.hero-h1{animation-delay:.15s}
.hero-p{animation-delay:.25s}

.hero-tag{
  display:inline-flex;align-items:center;gap:8px;
  padding:6px 16px 6px 12px;
  background:var(--card);border:1px solid var(--line);
  border-radius:99px;font-size:12px;font-weight:500;color:var(--t2);
  margin-bottom:28px;
}
.tag-dot{
  width:7px;height:7px;border-radius:50%;
  background:var(--human);box-shadow:0 0 10px var(--human);
  animation:blink 2.5s ease-in-out infinite;
}
@keyframes blink{0%,100%{opacity:1;transform:scale(1)}50%{opacity:.4;transform:scale(.7)}}

.hero-h1{
  font-family:var(--display);font-weight:800;
  font-size:clamp(44px,10vw,84px);line-height:1;
  letter-spacing:-.04em;margin-bottom:20px;
}
[dir="rtl"] .hero-h1{letter-spacing:0;line-height:1.15;font-size:clamp(40px,9vw,76px)}
.grad-text{
  background:linear-gradient(135deg,var(--human),var(--ai));
  -webkit-background-clip:text;-webkit-text-fill-color:transparent;
  background-clip:text;
  filter:drop-shadow(0 0 20px var(--human-dim));
}
.hero-p{font-size:17px;color:var(--t2);max-width:400px;margin:0 auto;font-weight:400}
[dir="rtl"] .hero-p{font-size:16px;line-height:1.9}

@keyframes rise{from{opacity:0;transform:translateY(28px)}to{opacity:1;transform:translateY(0)}}

/* ═══════════════════════════════════════
   PANEL (DROPZONE)
   ═══════════════════════════════════════ */
.panel{
  position:relative;aspect-ratio:16/9;max-height:380px;
  background:var(--card);border:1px solid var(--line);
  border-radius:var(--r2);overflow:hidden;cursor:pointer;
  transition:border-color .4s,transform .4s var(--ease),box-shadow .4s;
}
.panel:hover{border-color:var(--line2);box-shadow:0 8px 32px rgba(0,0,0,.15)}
.panel.drag{border-color:var(--t3);transform:scale(1.008)}
.panel.has{cursor:default}

.panel-glow{
  position:absolute;inset:0;pointer-events:none;opacity:0;transition:opacity .4s;
  background:radial-gradient(500px circle at var(--mx,50%) var(--my,50%),rgba(255,255,255,.045),transparent 60%);
}
[data-theme="light"] .panel-glow{background:radial-gradient(500px circle at var(--mx,50%) var(--my,50%),rgba(0,0,0,.04),transparent 60%)}
.panel:hover .panel-glow{opacity:1}

.panel-empty,.panel-preview{
  position:absolute;inset:0;display:flex;flex-direction:column;
  align-items:center;justify-content:center;gap:12px;
  transition:opacity .35s var(--ease),transform .35s var(--ease);
}
[hidden]{display:none!important}

.upload-ring{
  width:60px;height:60px;border-radius:50%;
  border:1.5px dashed var(--line2);
  display:grid;place-items:center;color:var(--t3);
  transition:all .4s var(--spring);
}
.panel:hover .upload-ring{color:var(--t2);border-color:var(--t3);transform:translateY(-4px) scale(1.08)}
.upload-text{font-size:15px;font-weight:500;color:var(--t2)}
[dir="rtl"] .upload-text{font-size:14px}
.upload-sub{font-size:12px;color:var(--t3);letter-spacing:.08em;text-transform:uppercase}
[dir="rtl"] .upload-sub{letter-spacing:0;text-transform:none;font-size:11px}

.face-warning{
  display:flex;align-items:center;gap:6px;
  padding:7px 14px;margin-top:10px;
  background:var(--ai-dim);border:1px solid color-mix(in srgb,var(--ai) 40%,transparent);
  border-radius:99px;font-size:11px;font-weight:600;color:var(--ai);
  letter-spacing:.02em;
}
[dir="rtl"] .face-warning{font-size:10px;letter-spacing:0}

.panel-preview{background:var(--bg)}
.panel-preview img{max-width:100%;max-height:100%;object-fit:contain}

.x-btn{
  position:absolute;top:14px;inset-inline-end:14px;z-index:5;
  width:36px;height:36px;border-radius:50%;border:none;
  background:rgba(0,0,0,.55);backdrop-filter:blur(10px);
  color:#fff;display:grid;place-items:center;
  transition:all .25s var(--spring);
}
.x-btn:hover{background:rgba(255,255,255,.18);transform:scale(1.12) rotate(90deg)}

.scan{
  position:absolute;left:0;right:0;height:2px;top:0;
  background:linear-gradient(90deg,transparent 5%,var(--ai) 50%,transparent 95%);
  box-shadow:0 0 24px 4px var(--ai-dim);
  opacity:0;pointer-events:none;z-index:4;
}
.panel.scanning .scan{opacity:1;animation:scanMove 1.8s ease-in-out infinite}
@keyframes scanMove{0%{top:-2px;opacity:0}8%{opacity:1}92%{opacity:1}100%{top:100%;opacity:0}}

/* ═══════════════════════════════════════
   GO BUTTON
   ═══════════════════════════════════════ */
.go-btn{
  width:100%;margin-top:20px;padding:18px 24px;
  display:flex;align-items:center;justify-content:center;gap:10px;
  background:var(--t1);color:var(--bg);border:none;
  border-radius:var(--r);font-size:16px;font-weight:600;
  position:relative;overflow:hidden;
  transition:all .35s var(--ease);
}
.go-btn::after{
  content:'';position:absolute;inset:0;
  background:linear-gradient(105deg,transparent 40%,rgba(255,255,255,.25) 50%,transparent 60%);
  transform:translateX(-120%);transition:none;
}
.go-btn:hover:not(:disabled)::after{transform:translateX(120%);transition:transform .7s}
.go-btn:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 16px 40px -12px rgba(0,0,0,.35)}
.go-btn:disabled{background:var(--card);color:var(--t3);cursor:not-allowed;transform:none;box-shadow:none}
.go-btn svg{transition:transform .3s var(--ease)}
.go-btn:hover:not(:disabled) svg{transform:translateX(4px)}
[dir="rtl"] .go-btn:hover:not(:disabled) svg{transform:scaleX(-1) translateX(4px)}

/* ═══════════════════════════════════════
   THINKING
   ═══════════════════════════════════════ */
.thinking{margin-top:40px;text-align:center;animation:rise .5s var(--ease) both}
.thinking-bar{
  width:160px;height:3px;margin:0 auto 14px;
  background:var(--line);border-radius:99px;overflow:hidden;
}
.thinking-fill{
  width:40%;height:100%;background:var(--t2);border-radius:99px;
  animation:slide 1.2s ease-in-out infinite;
}
@keyframes slide{0%{transform:translateX(-100%)}100%{transform:translateX(350%)}}
.thinking span{font-size:13px;color:var(--t3);font-weight:500}
[dir="rtl"] .thinking span{font-size:12px}

/* ═══════════════════════════════════════
   OUTPUT
   ═══════════════════════════════════════ */
.output{margin-top:48px;animation:rise .7s var(--ease) both}
.output-card{
  background:var(--card);border:1px solid var(--line);
  border-radius:var(--r2);padding:36px;
  position:relative;overflow:hidden;
}
.output-card::before{
  content:'';position:absolute;inset:-1px;border-radius:var(--r2);padding:1px;
  background:conic-gradient(from 180deg,var(--line),var(--ai-dim),var(--line),var(--human-dim),var(--line));
  -webkit-mask:linear-gradient(#fff 0 0) content-box,linear-gradient(#fff 0 0);
  -webkit-mask-composite:xor;mask-composite:exclude;
  pointer-events:none;opacity:.5;
  animation:borderSpin 8s linear infinite;
}
@keyframes borderSpin{to{transform:rotate(360deg)}}

.output-top{
  display:flex;justify-content:space-between;align-items:center;
  margin-bottom:36px;padding-bottom:16px;border-bottom:1px solid var(--line);
}
.output-tag{font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:.18em;color:var(--t3)}
[dir="rtl"] .output-tag{letter-spacing:.1em;font-size:10px}
.output-info{font-size:12px;color:var(--t3);font-variant-numeric:tabular-nums}

.output-verdict{
  font-family:var(--display);font-weight:800;
  font-size:clamp(52px,14vw,100px);line-height:1;
  letter-spacing:-.04em;
  margin-bottom:32px;
  min-height:120px;
  display:flex;
  align-items:center;
  justify-content:center;
  text-align:center;
  animation:pop .7s var(--spring) both;
}
[dir="rtl"] .output-verdict{letter-spacing:0;font-size:clamp(48px,13vw,92px);line-height:1.1}
.output-verdict.human{color:var(--human);text-shadow:0 0 40px var(--human-dim)}
.output-verdict.ai{color:var(--ai);text-shadow:0 0 40px var(--ai-dim)}
@keyframes pop{from{opacity:0;transform:scale(.88) translateY(30px);filter:blur(8px)}to{opacity:1;transform:none;filter:none}}

.output-meter{text-align:center;margin-bottom:32px}
.meter-track{
  width:100%;max-width:280px;height:5px;margin:0 auto 14px;
  background:var(--line);border-radius:99px;overflow:hidden;
}
.meter-fill{height:100%;width:0;border-radius:99px;transition:width 1.2s var(--ease)}
.meter-num{font-family:var(--display);font-size:22px;font-weight:700;color:var(--t2)}
.meter-num small{font-size:14px;font-weight:500;margin-inline-start:2px}

.output-grid{
  display:grid;
  grid-template-columns:repeat(2, 1fr);
  gap:12px;
}
.prob{
  display:flex;
  justify-content:space-between;
  align-items:center;
  padding:16px 20px;
  background:var(--bg);
  border:1px solid var(--line);
  border-radius:var(--r);
  transition:all .3s var(--ease);
  animation:rise .5s var(--ease) both;
}
.prob:nth-child(2){animation-delay:.08s}
.prob:hover{border-color:var(--line2);transform:translateY(-2px)}
.prob-name{font-size:13px;color:var(--t2);font-weight:500}
[dir="rtl"] .prob-name{font-size:12px}
.prob-val{font-family:var(--display);font-size:15px;font-weight:700}

/* ═══════════════════════════════════════
   FOOTER
   ═══════════════════════════════════════ */
.foot{max-width:720px;margin:80px auto 0;padding:32px 24px 48px;border-top:1px solid var(--line)}
.foot-brand{
  margin-bottom:28px;padding-bottom:20px;
  border-bottom:1px solid var(--line);
}
.foot-brand-text{display:flex;flex-direction:column;gap:6px}
.foot-name-row{
  display:flex;align-items:center;gap:10px;flex-wrap:wrap;
}
.foot-model{
  font-family:var(--display);font-size:18px;font-weight:700;
  letter-spacing:-.02em;color:var(--t1);
  word-break:break-word;
}
[dir="rtl"] .foot-model{letter-spacing:0;font-size:16px}
.foot-download{
  display:inline-flex;align-items:center;gap:5px;
  padding:3px 10px;
  background:var(--human-dim);
  border:1px solid color-mix(in srgb,var(--human) 35%,transparent);
  border-radius:99px;
  font-size:11px;font-weight:600;color:var(--human);
  white-space:nowrap;
}
.foot-download svg{flex-shrink:0}
.foot-desc{font-size:13px;color:var(--t2);font-weight:400}
[dir="rtl"] .foot-desc{font-size:12px}

.foot-cols{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-bottom:20px}
.foot-cols div{display:flex;flex-direction:column;gap:6px}
.foot-cols small{font-size:10px;font-weight:700;text-transform:uppercase;letter-spacing:.18em;color:var(--t3)}
[dir="rtl"] .foot-cols small{letter-spacing:.1em}
.foot-cols span{font-size:14px;font-weight:500;color:var(--t2);display:flex;align-items:center;gap:8px}
.live-dot{width:7px;height:7px;border-radius:50%;background:var(--human);box-shadow:0 0 10px var(--human);animation:blink 2.5s infinite}
.foot-note{font-size:12px;color:var(--t3);line-height:1.7;max-width:380px}
[dir="rtl"] .foot-note{font-size:11px;line-height:1.9}

/* ═══════════════════════════════════════
   RESPONSIVE
   ═══════════════════════════════════════ */
@media(max-width:600px){
  .header-top{padding:10px 16px;flex-wrap:wrap;gap:10px;justify-content:center}
  .links-bar{gap:12px;flex-wrap:wrap;justify-content:center}
  .links-bar a{font-size:11px}
  .brand{padding:12px 16px;justify-content:center}
  .brand-name{font-size:13px;text-align:center}
  [dir="rtl"] .brand-name{font-size:12px}
  .brand-ver{display:none}
  .download-badge{font-size:10px;padding:3px 8px}
  main{padding:0 16px}
  .hero{padding:60px 0 40px}
  .hero-h1{font-size:40px}
  [dir="rtl"] .hero-h1{font-size:36px}
  .output-verdict{min-height:100px}
  .foot-brand{flex-direction:column;text-align:center;align-items:center}
  .foot-name-row{justify-content:center}
  .foot-cols{grid-template-columns:1fr;text-align:center}
  .foot-cols span{justify-content:center}
  .foot-note{text-align:center;margin:0 auto}
  .output-grid{grid-template-columns:1fr}
}