/* =========================================================
   SOBHAN MAHMOUDI — living résumé
   Palette: void black / blood red / phosphor green / bone
========================================================= */
:root{
  --void:      #07080a;
  --void-2:    #0c0e11;
  --panel:     #101318;
  --line:      #1d2128;
  --bone:      #d9dde1;
  --dim:       #7c8590;
  --red:       #e0293f;
  --red-dim:   #7c1524;
  --red-glow:  rgba(224,41,63,0.35);
  --green:     #39d67e;
  --green-dim: #164a2f;
  --amber:     #e0a72f;

  --font-mono: 'JetBrains Mono', 'Vazirmatn', monospace;
  --font-fa:   'Vazirmatn', 'JetBrains Mono', sans-serif;
  --font-sans: 'Inter', 'Vazirmatn', sans-serif;

  --maxw: 1080px;
  --radius: 3px;
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--void);
  color:var(--bone);
  font-family:var(--font-sans);
  line-height:1.6;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}
html[data-lang="fa"] body{ font-family:var(--font-fa); }
::selection{ background:var(--red); color:var(--void); }

a{ color:inherit; text-decoration:none; }
button{ font-family:inherit; cursor:pointer; }
.mono{ font-family:var(--font-mono); letter-spacing:.02em; }
html[data-lang="fa"] .mono{ font-family:var(--font-fa); letter-spacing:0; }

@media (prefers-reduced-motion: reduce){
  *{ animation-duration:.001ms !important; animation-iteration-count:1 !important; transition-duration:.001ms !important; scroll-behavior:auto !important; }
}

/* ---------- background layers ---------- */
#scene{
  position:fixed; inset:0; width:100%; height:100%;
  z-index:0; display:block;
}
#scanlines{
  position:fixed; inset:0; z-index:1; pointer-events:none;
  background:repeating-linear-gradient(to bottom, rgba(255,255,255,0.025) 0px, rgba(255,255,255,0.025) 1px, transparent 1px, transparent 3px);
  mix-blend-mode:overlay;
}
#noise{
  position:fixed; inset:0; z-index:1; pointer-events:none; opacity:.035;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}
body::before{
  content:"";
  position:fixed; inset:0; z-index:1; pointer-events:none;
  background:radial-gradient(ellipse at 50% -10%, rgba(224,41,63,0.10), transparent 55%),
             radial-gradient(ellipse at 100% 110%, rgba(57,214,126,0.06), transparent 50%);
}

/* ---------- boot screen ---------- */
#boot-screen{
  position:fixed; inset:0; z-index:100; background:var(--void);
  display:flex; flex-direction:column; align-items:center; justify-content:center;
  gap:18px; padding:24px; transition:opacity .5s ease, visibility .5s;
}
#boot-screen.hidden{ opacity:0; visibility:hidden; pointer-events:none; }
#boot-log{
  font-family:var(--font-mono); color:var(--green); font-size:12.5px;
  white-space:pre-wrap; max-width:520px; width:90%; min-height:180px;
  margin:0; text-shadow:0 0 6px rgba(57,214,126,.4);
}
.boot-bar{ width:280px; height:2px; background:var(--line); }
.boot-bar-fill{ height:100%; width:0%; background:var(--red); box-shadow:0 0 8px var(--red-glow); transition:width .2s linear; }

/* ---------- topbar ---------- */
#topbar{
  position:fixed; top:0; left:0; right:0; z-index:40;
  display:flex; align-items:center; justify-content:space-between;
  padding:16px clamp(16px,4vw,40px);
  background:linear-gradient(to bottom, rgba(7,8,10,.92), rgba(7,8,10,0));
  backdrop-filter:blur(2px);
}
.brand{ display:flex; align-items:center; gap:8px; font-family:var(--font-mono); font-weight:700; letter-spacing:.06em; }
.brand-glyph{ color:var(--red); }
#primary-nav{ display:flex; gap:28px; font-family:var(--font-mono); font-size:13px; color:var(--dim); }
#primary-nav a{ position:relative; padding:4px 0; transition:color .2s; }
#primary-nav a:hover, #primary-nav a:focus-visible{ color:var(--bone); }
#primary-nav a::after{
  content:""; position:absolute; left:0; bottom:-2px; height:1px; width:0;
  background:var(--red); transition:width .25s ease;
}
#primary-nav a:hover::after{ width:100%; }
.topbar-controls{ display:flex; align-items:center; gap:10px; }

.pill-btn{
  display:flex; align-items:center; gap:8px;
  background:rgba(16,19,24,.8); border:1px solid var(--line); color:var(--bone);
  padding:8px 14px; border-radius:999px; font-family:var(--font-mono); font-size:12px;
  transition:border-color .2s, box-shadow .2s;
}
.pill-btn:hover{ border-color:var(--red-dim); box-shadow:0 0 14px rgba(224,41,63,.15); }
.pill-btn.ghost{ padding:8px 12px; }
.pill-btn .dot{ width:7px; height:7px; border-radius:50%; background:var(--dim); box-shadow:0 0 6px transparent; }
.pill-btn[aria-pressed="true"] .dot{ background:var(--green); box-shadow:0 0 8px var(--green); animation:pulse 1.4s infinite; }
@keyframes pulse{ 0%,100%{opacity:1;} 50%{opacity:.4;} }

.icon-btn{
  width:34px; height:34px; display:flex; align-items:center; justify-content:center;
  background:transparent; border:1px solid var(--line); border-radius:50%; color:var(--bone);
}
#menu-toggle{ display:none; flex-direction:column; gap:4px; }
#menu-toggle span{ width:16px; height:1px; background:var(--bone); }

#mobile-nav{
  position:fixed; top:64px; left:16px; right:16px; z-index:39;
  background:var(--panel); border:1px solid var(--line); border-radius:var(--radius);
  display:flex; flex-direction:column; padding:8px;
}
#mobile-nav a{ padding:12px 14px; font-family:var(--font-mono); font-size:14px; color:var(--dim); border-radius:2px; }
#mobile-nav a:hover{ background:var(--void-2); color:var(--bone); }

/* ---------- vision HUD ---------- */
#vision-hud{
  position:fixed; bottom:18px; z-index:45;
  inset-inline-end:18px;
  width:220px; background:var(--panel); border:1px solid var(--red-dim); border-radius:var(--radius);
  overflow:hidden; box-shadow:0 0 30px rgba(224,41,63,.15);
}
#webcam{ width:100%; height:150px; object-fit:cover; display:block; transform:scaleX(-1); background:#000; }
#hud-canvas{ position:absolute; top:0; inset-inline-start:0; width:220px; height:150px; transform:scaleX(-1); pointer-events:none; }
#vision-status{ padding:8px 10px; font-family:var(--font-mono); font-size:10.5px; color:var(--dim); }
.vs-row{ display:flex; justify-content:space-between; padding:2px 0; }
.vs-val{ color:var(--green); }
#vision-close{ position:absolute; top:6px; inset-inline-end:6px; width:24px; height:24px; background:rgba(7,8,10,.7); border-color:var(--line); }

#cursor-ring{
  position:fixed; top:0; left:0; width:34px; height:34px; z-index:200;
  border:2px solid var(--red); border-radius:50%; pointer-events:none;
  transform:translate(-50%,-50%); opacity:0; transition:opacity .2s, border-color .15s, transform .05s linear;
  box-shadow:0 0 16px var(--red-glow);
}
#cursor-ring.active{ opacity:1; }
#cursor-ring.grab{ border-color:var(--green); box-shadow:0 0 16px rgba(57,214,126,.4); transform:translate(-50%,-50%) scale(.6); }

/* ---------- layout shell ---------- */
#content{ position:relative; z-index:5; }
.section{ max-width:var(--maxw); margin:0 auto; padding:120px 24px; }
.section-head{ margin-bottom:48px; }
.tag{ display:inline-block; color:var(--red); font-size:12px; margin-bottom:14px; }
.section-head h2{ font-size:clamp(26px,3.4vw,38px); margin:0; font-weight:700; letter-spacing:-.01em; }

/* ---------- hero ---------- */
#hero{
  min-height:100vh; display:flex; flex-direction:column; align-items:flex-start; justify-content:center;
  max-width:var(--maxw); margin:0 auto; padding:120px 24px 60px; position:relative;
}
.eyebrow{ color:var(--green); font-size:13px; margin:0 0 18px; }
.glitch{
  font-family:var(--font-mono); font-weight:800; font-size:clamp(38px,7.4vw,92px);
  line-height:1.02; margin:0 0 18px; letter-spacing:-.01em; position:relative; color:var(--bone);
}
.glitch::before,.glitch::after{
  content:attr(data-text); position:absolute; top:0; left:0; width:100%; overflow:hidden;
  clip-path:inset(0 0 0 0);
}
.glitch::before{ color:var(--red); transform:translate(2px,0); mix-blend-mode:screen; animation:glitch-1 4.5s infinite steps(1); }
.glitch::after{ color:var(--green); transform:translate(-2px,0); mix-blend-mode:screen; animation:glitch-2 5.2s infinite steps(1); }
@keyframes glitch-1{
  0%,92%,100%{ clip-path:inset(0 0 0 0); transform:translate(0,0); opacity:0; }
  93%{ clip-path:inset(10% 0 60% 0); transform:translate(3px,-2px); opacity:.85; }
  95%{ clip-path:inset(60% 0 5% 0); transform:translate(-3px,1px); opacity:.85; }
  97%{ clip-path:inset(30% 0 40% 0); transform:translate(2px,0); opacity:.7; }
}
@keyframes glitch-2{
  0%,90%,100%{ clip-path:inset(0 0 0 0); transform:translate(0,0); opacity:0; }
  91%{ clip-path:inset(70% 0 5% 0); transform:translate(-3px,2px); opacity:.8; }
  94%{ clip-path:inset(15% 0 55% 0); transform:translate(3px,-1px); opacity:.8; }
  98%{ clip-path:inset(45% 0 20% 0); transform:translate(-2px,0); opacity:.6; }
}
.hero-role{ color:var(--dim); font-size:15px; margin:0 0 22px; }
.hero-desc{ max-width:560px; color:var(--bone); font-size:16px; margin:0 0 32px; opacity:.9; }
.hero-actions{ display:flex; gap:16px; flex-wrap:wrap; margin-bottom:28px; }
.btn{
  padding:13px 26px; border-radius:2px; font-family:var(--font-mono); font-size:13px;
  border:1px solid var(--line); background:transparent; color:var(--bone);
  transition:all .2s ease; display:inline-flex; align-items:center; gap:8px;
}
.btn.primary{ background:var(--red); border-color:var(--red); color:#0a0405; font-weight:700; }
.btn.primary:hover{ box-shadow:0 0 24px var(--red-glow); transform:translateY(-1px); }
.btn.ghost:hover{ border-color:var(--bone); }
.hero-meta{ display:flex; gap:10px; color:var(--dim); font-size:12.5px; }
.hero-meta .sep{ color:var(--red-dim); }
.hero-hint{
  position:absolute; bottom:28px; left:24px; right:24px; text-align:center;
  opacity:.75;
}
.hero-hint button{
  background:transparent; border:1px solid var(--line); color:var(--dim);
  font-family:var(--font-mono); font-size:11.5px; padding:8px 16px; border-radius:999px;
  transition:border-color .2s, color .2s;
}
html[data-lang="fa"] .hero-hint button{ font-family:var(--font-fa); }
.hero-hint button:hover{ border-color:var(--red-dim); color:var(--bone); }

/* ---------- gesture guide ---------- */
.guide-box{ width:min(600px,100%); }
.guide-intro{ color:var(--dim); font-size:13.5px; margin:0 0 22px; }
.guide-list{ list-style:none; margin:0 0 26px; padding:0; display:flex; flex-direction:column; gap:16px; }
.guide-list li{ display:flex; gap:16px; align-items:flex-start; }
.guide-icon{ flex:none; color:var(--red); font-size:12px; padding-top:2px; opacity:.8; }
.guide-list strong{ display:block; font-size:14.5px; margin-bottom:3px; }
.guide-list p{ margin:0; color:var(--dim); font-size:13px; line-height:1.5; }
#vision-help{ position:absolute; top:11px; inset-inline-end:46px; width:22px; height:22px; background:rgba(7,8,10,.7); border-color:var(--line); font-family:var(--font-mono); font-size:11px; }

/* ---------- about ---------- */
.about-grid{ display:grid; grid-template-columns:1.5fr 1fr; gap:56px; align-items:start; }
.about-text{ font-size:16px; color:var(--bone); opacity:.92; max-width:60ch; }
.about-facts{ list-style:none; margin:0; padding:0; border-top:1px solid var(--line); }
.about-facts li{ display:flex; justify-content:space-between; padding:14px 0; border-bottom:1px solid var(--line); font-size:12.5px; }
.about-facts li span:first-child{ color:var(--dim); }
.about-facts li span:last-child{ color:var(--green); text-align:right; }
html[dir="rtl"] .about-facts li span:last-child{ text-align:left; }

/* ---------- skills ---------- */
.skills-grid{ display:grid; grid-template-columns:repeat(auto-fit,minmax(230px,1fr)); gap:1px; background:var(--line); border:1px solid var(--line); }
.skill-card{ background:var(--void-2); padding:26px 22px; transition:background .2s; }
.skill-card:hover{ background:var(--panel); }
.skill-card .sk-icon{ color:var(--red); font-family:var(--font-mono); font-size:12px; margin-bottom:14px; opacity:.8; }
.skill-card h3{ margin:0 0 10px; font-size:16px; }
.skill-card p{ margin:0; color:var(--dim); font-size:13px; line-height:1.6; }
.skill-card .sk-tags{ margin-top:14px; display:flex; flex-wrap:wrap; gap:6px; }
.skill-card .sk-tags span{ font-family:var(--font-mono); font-size:10.5px; color:var(--green); border:1px solid var(--green-dim); padding:3px 8px; border-radius:999px; }

/* ---------- timeline ---------- */
.timeline{ position:relative; border-inline-start:1px solid var(--line); padding-inline-start:32px; }
.tl-item{ position:relative; padding-bottom:44px; }
.tl-item:last-child{ padding-bottom:0; }
.tl-item::before{
  content:""; position:absolute; inset-inline-start:-37px; top:4px; width:11px; height:11px;
  border-radius:50%; background:var(--void); border:2px solid var(--red);
}
.tl-date{ font-family:var(--font-mono); color:var(--red); font-size:12px; margin-bottom:6px; display:block; }
.tl-item h3{ margin:0 0 6px; font-size:17px; }
.tl-org{ color:var(--dim); font-size:13px; margin-bottom:10px; display:block; }
.tl-item p{ margin:0; color:var(--bone); opacity:.85; font-size:14px; max-width:65ch; }

/* ---------- research ---------- */
.research-grid{ display:grid; grid-template-columns:repeat(auto-fit,minmax(260px,1fr)); gap:20px; }
.rs-card{ border:1px solid var(--line); padding:24px; border-radius:var(--radius); position:relative; overflow:hidden; transition:border-color .2s, transform .2s; }
.rs-card:hover{ border-color:var(--red-dim); transform:translateY(-3px); }
.rs-card::before{ content:""; position:absolute; top:0; inset-inline-start:0; width:2px; height:100%; background:var(--red); opacity:.5; }
.rs-card .rs-severity{ font-family:var(--font-mono); font-size:10.5px; color:var(--amber); margin-bottom:10px; display:inline-block; }
.rs-card h3{ margin:0 0 10px; font-size:16px; }
.rs-card p{ margin:0; color:var(--dim); font-size:13px; }

/* ---------- resume download ---------- */
.resume-grid{ display:flex; flex-wrap:wrap; gap:32px; align-items:center; justify-content:space-between; }
.resume-text{ max-width:46ch; color:var(--bone); opacity:.9; margin:0; }
.resume-actions{ display:flex; gap:16px; flex-wrap:wrap; }
.resume-link{ position:relative; }
.resume-link.is-missing{ opacity:.45; pointer-events:none; }
.resume-note{ flex-basis:100%; color:var(--dim); font-size:12px; margin:0; }
.resume-note code{ color:var(--green); }

/* ---------- contact ---------- */
.contact-grid{ display:flex; flex-wrap:wrap; gap:40px; justify-content:space-between; align-items:flex-start; }
.contact-text{ max-width:44ch; color:var(--bone); opacity:.9; }
.contact-links{ display:flex; flex-direction:column; gap:10px; min-width:240px; }
.contact-links a{
  display:flex; justify-content:space-between; padding:12px 16px; border:1px solid var(--line);
  font-size:13px; transition:border-color .2s, color .2s;
}
.contact-links a:hover{ border-color:var(--red); color:var(--red); }

#site-footer{ text-align:center; padding:40px 24px 60px; color:var(--dim); font-size:12px; }

/* ---------- popup ---------- */
.popup-overlay{
  position:fixed; inset:0; z-index:80; background:rgba(4,4,5,.86); backdrop-filter:blur(4px);
  display:flex; align-items:center; justify-content:center; padding:20px;
  opacity:0; transition:opacity .35s ease;
}
.popup-overlay.show{ opacity:1; }
.popup-box{
  position:relative; width:min(560px,100%); background:var(--panel); border:1px solid var(--red-dim);
  border-radius:var(--radius); padding:32px; box-shadow:0 0 60px rgba(224,41,63,.18);
  transform:translateY(14px); transition:transform .35s ease;
}
.popup-overlay.show .popup-box{ transform:translateY(0); }
.popup-box h3{ margin:6px 0 18px; font-size:20px; }
.popup-video-wrap{ position:relative; width:100%; aspect-ratio:16/9; background:#000; border:1px solid var(--line); margin-bottom:20px; }
.popup-video-wrap video{ width:100%; height:100%; object-fit:cover; display:block; }
.popup-video-fallback{
  position:absolute; inset:0; display:flex; align-items:center; justify-content:center; text-align:center;
  padding:20px; color:var(--dim); font-size:12.5px; font-family:var(--font-mono);
}
.popup-video-fallback code{ color:var(--green); }
#popup-close{ position:absolute; top:14px; inset-inline-end:14px; }

/* ---------- toast ---------- */
.toast{
  position:fixed; bottom:20px; left:50%; transform:translateX(-50%); z-index:90;
  background:var(--panel); border:1px solid var(--red-dim); color:var(--bone); padding:12px 18px;
  border-radius:2px; font-family:var(--font-mono); font-size:12.5px; display:flex; align-items:center; gap:14px;
  max-width:90vw;
}

/* =========================================================
   [hidden] attribute enforcement — several elements below need
   `display:flex` when SHOWN, but that same rule was also beating
   the browser's default `[hidden]{display:none}` at equal
   specificity, so #mobile-nav / the popups / the toast were
   rendering (and, for the two full-screen popups, intercepting
   every click on the page) even while marked hidden. These rules
   have higher specificity than the ones above, so they always win
   while the hidden attribute is present.
========================================================= */
#mobile-nav[hidden],
.popup-overlay[hidden],
.toast[hidden]{ display:none; }

/* ---------- gesture click flash ---------- */
.gesture-flash{ outline:2px solid var(--green); outline-offset:3px; transition:outline-color .25s; }

/* ---------- RTL flip ---------- */
html[dir="rtl"] .timeline{ border-inline-start:1px solid var(--line); }
html[dir="rtl"] .rs-card::before{ inset-inline-start:auto; inset-inline-end:0; }

/* ---------- responsive ---------- */
@media (max-width:860px){
  #primary-nav{ display:none; }
  #menu-toggle{ display:flex; }
  .about-grid{ grid-template-columns:1fr; }
  #vision-hud{ width:150px; }
  #webcam,#hud-canvas{ height:100px; }
}
@media (max-width:700px){
  #vision-toggle span:last-child{ display:none; }
  #vision-hud{ display:none !important; }
  .hero-hint{ display:none; }
}
@media (max-width:520px){
  .section{ padding:80px 18px; }
  .hero-actions{ flex-direction:column; align-items:stretch; }
}