/* =========================================================
   Yara Alotaibi — AI Engineer Portfolio
   Design tokens
   ========================================================= */
:root{
  --bg:            #0B0F1E;
  --bg-alt:        #10152C;
  --surface:       #161D3B;
  --surface-hover: #1C2448;
  --border:        rgba(140,158,255,0.14);
  --border-strong: rgba(140,158,255,0.28);
  --text:          #ECEFFB;
  --text-dim:      #8D96BF;
  --text-faint:    #5C6490;
  --blue:          #4E7FFF;
  --violet:        #8B6BFF;
  --gold:          #E7B25C;

  --font-display-en: 'Space Grotesk', sans-serif;
  --font-body-en:     'Inter', sans-serif;
  --font-ar:          'Tajawal', sans-serif;

  --radius: 14px;
  --radius-sm: 8px;
  --container: 1120px;
}

*{ box-sizing: border-box; margin:0; padding:0; }

html{ scroll-behavior: smooth; }

body{
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body-en);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}

body[dir="rtl"], body.lang-ar{
  font-family: var(--font-ar);
}

/* subtle grid texture on the whole site */
body::before{
  content:"";
  position: fixed; inset:0;
  background-image:
    radial-gradient(circle at 15% 10%, rgba(78,127,255,0.08), transparent 45%),
    radial-gradient(circle at 85% 30%, rgba(139,107,255,0.07), transparent 40%);
  pointer-events: none;
  z-index: 0;
}

a{ color: inherit; text-decoration: none; }
ul{ list-style: none; }
img{ max-width:100%; display:block; }

.container{
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 32px;
}

/* language visibility ----------------------------------
   track the active language, and a bare selector would match body
   too, setting the whole page to display:none. */
body .lang-en, body .lang-ar{ display:none; }
body.lang-en .lang-en{ display: initial; }
body.lang-ar .lang-ar{ display: initial; }
body.lang-en .lang-en.block,
body.lang-ar .lang-ar.block{ display:block; }
body.lang-en .lang-en.flex,
body.lang-ar .lang-ar.flex{ display:flex; }

body.lang-ar{ direction: rtl; }
body.lang-en{ direction: ltr; }

/* =========================================================
   Nav
   ========================================================= */
.site-nav{
  position: sticky; top:0; z-index: 100;
  background: rgba(11,15,30,0.82);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
}
.site-nav .container{
  display:flex; align-items:center; justify-content:space-between;
  height: 72px;
}
.nav-mark{
  display:flex; align-items:center; gap:10px;
  font-family: var(--font-display-en);
  font-weight:600; font-size:1.05rem; letter-spacing:0.02em;
}
.nav-mark svg{ width:30px; height:30px; }
.nav-links{
  display:flex; gap:28px; align-items:center;
}
.nav-links a{
  font-size:0.92rem; color: var(--text-dim);
  transition: color .2s ease;
  position:relative;
}
.nav-links a:hover, .nav-links a.active{ color: var(--text); }
.nav-links a.active::after{
  content:""; position:absolute; left:0; right:0; bottom:-22px;
  height:2px; background: linear-gradient(90deg,var(--blue),var(--violet));
}
.lang-toggle{
  display:flex; border:1px solid var(--border-strong); border-radius: 999px;
  overflow:hidden; font-size:0.8rem;
}
.lang-toggle button{
  background:none; border:none; color:var(--text-dim);
  padding:7px 14px; cursor:pointer; font-family: inherit;
  transition: all .2s ease;
}
.lang-toggle button.active{
  background: linear-gradient(90deg,var(--blue),var(--violet));
  color:#fff;
}
.nav-toggle-btn{ display:none; background:none;border:none;color:var(--text); font-size:1.5rem; cursor:pointer; }

/* groups the language toggle + mobile hamburger together on the right side
   of the nav bar */
.nav-right{ display:flex; align-items:center; gap:16px; }

@media(max-width:820px){
  .nav-links{
    position:fixed; top:72px; left:0; right:0;
    background: var(--bg-alt); border-bottom:1px solid var(--border);
    flex-direction:column; padding:20px 32px; gap:18px;
    transform: translateY(-150%); transition: transform .25s ease;
  }
  .nav-links.open{ transform: translateY(0); }
  .nav-toggle-btn{ display:block; }
}

/* =========================================================
   Buttons / chips
   ========================================================= */
.btn{
  display:inline-flex; align-items:center; gap:8px;
  padding: 13px 26px; border-radius: 999px;
  font-size:0.92rem; font-weight:600;
  border:1px solid var(--border-strong);
  transition: all .2s ease;
  cursor:pointer;
}
.btn-primary{
  background: linear-gradient(90deg,var(--blue),var(--violet));
  border:none; color:#fff;
}
.btn-primary:hover{ filter:brightness(1.1); transform: translateY(-1px); }
.btn-ghost{ background: transparent; color: var(--text); }
.btn-ghost:hover{ border-color: var(--gold); color: var(--gold); }

.chip{
  display:inline-block; padding:7px 15px; border-radius:999px;
  background: var(--surface); border:1px solid var(--border);
  font-size:0.82rem; color: var(--text-dim);
}

.eyebrow{
  font-size:0.78rem; letter-spacing:0.14em; text-transform:uppercase;
  color: var(--gold); font-weight:600; margin-bottom:14px; display:block;
}

/* =========================================================
   Hero (index)
   ========================================================= */
.hero{
  position:relative;
  min-height: 92vh;
  display:flex; align-items:center;
  padding: 60px 0;
  overflow:hidden;
}
#neuro-canvas{
  position:absolute; inset:0; z-index:0;
  width:100%; height:100%;
}
.hero-content{
  position:relative; z-index:2;
  max-width: 720px;
}
.hero h1{
  font-family: var(--font-display-en);
  font-size: clamp(2.6rem, 6vw, 4.4rem);
  font-weight:600; line-height:1.05; letter-spacing:-0.01em;
  margin-bottom: 18px;
}
body.lang-ar .hero h1{ font-family: var(--font-ar); font-weight:700; }
.hero h1 .accent{
  background: linear-gradient(90deg,var(--blue),var(--violet));
  -webkit-background-clip:text; background-clip:text; color:transparent;
}
.hero .sub{
  font-size:1.05rem; color: var(--text-dim); margin-bottom:30px; max-width:560px;
}
.hero .roles{
  display:flex; flex-wrap:wrap; gap:10px; margin-bottom:38px;
}
.hero-actions{ display:flex; gap:14px; flex-wrap:wrap; }

.identity-layout{ display:block; }
#identity-canvas{ display:none; }
@media(min-width:1050px){
  .identity-layout{ display:flex; align-items:center; gap:48px; }
  #identity-canvas{
    display:block; flex-shrink:0;
    width:380px; height:270px;
  }
  .identity-layout .hero-content{ flex:1; min-width:0; max-width:600px; }
}

.scroll-hint{
  position:absolute; bottom:36px; left:32px; z-index:2;
  font-size:0.78rem; color:var(--text-faint);
  display:flex; align-items:center; gap:8px;
}
body.lang-ar .scroll-hint{ left:auto; right:32px; }
.scroll-hint .line{
  width:1px; height:30px; background: linear-gradient(var(--blue),transparent);
  display:block;
}

/* =========================================================
   Sections
   ========================================================= */
.section{ padding: 100px 0; position:relative; z-index:1; }
.section-head{ max-width: 640px; margin-bottom: 56px; }
.section-head h2{
  font-family: var(--font-display-en);
  font-size: clamp(1.8rem,3.4vw,2.6rem);
  font-weight:600; margin-bottom:14px;
}
body.lang-ar .section-head h2{ font-family: var(--font-ar); font-weight:700; }
.section-head p{ color: var(--text-dim); }
.section-alt{ background: var(--bg-alt); }

/* =========================================================
   Page header (inner pages)
   ========================================================= */
.page-header{
  padding: 70px 0 50px;
  border-bottom:1px solid var(--border);
  position:relative; overflow:hidden;
}
.page-header h1{
  font-family: var(--font-display-en);
  font-size: clamp(2rem,4vw,3rem);
  font-weight:600;
}
body.lang-ar .page-header h1{ font-family: var(--font-ar); font-weight:700; }
.page-header p{ color: var(--text-dim); margin-top:12px; max-width:600px; }

/* =========================================================
   Cards — projects / grid
   ========================================================= */
.grid{ display:grid; gap:26px; }
.grid-2{ grid-template-columns: repeat(2,1fr); }
.grid-3{ grid-template-columns: repeat(3,1fr); }
@media(max-width:820px){ .grid-2,.grid-3{ grid-template-columns:1fr; } }

.card{
  background: var(--surface);
  border:1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  transition: border-color .2s ease, transform .2s ease;
}
.card:hover{ border-color: var(--border-strong); transform: translateY(-3px); }

.project-card{
  display:block; overflow:hidden; padding:0;
}
.project-card .thumb{
  height: 190px;
  background: linear-gradient(135deg, rgba(78,127,255,0.18), rgba(139,107,255,0.14));
  display:flex; align-items:center; justify-content:center;
  border-bottom:1px solid var(--border);
  position:relative;
}
.project-card .thumb .placeholder-label{
  font-size:0.78rem; color: var(--text-faint); border:1px dashed var(--border-strong);
  padding:8px 14px; border-radius:8px;
}
.project-card .body{ padding:24px; }
.project-card h3{
  font-family: var(--font-display-en); font-weight:600; font-size:1.2rem; margin-bottom:8px;
}
body.lang-ar .project-card h3{ font-family: var(--font-ar); font-weight:700; }
.project-card p{ color: var(--text-dim); font-size:0.92rem; margin-bottom:16px; }
.project-card .tags{ display:flex; flex-wrap:wrap; gap:8px; }

/* image / media placeholders you will replace later */
.media-placeholder{
  border:1.5px dashed var(--border-strong);
  border-radius: var(--radius);
  min-height: 220px;
  display:flex; align-items:center; justify-content:center;
  flex-direction:column; gap:8px;
  color: var(--text-faint); font-size:0.85rem;
  background: rgba(255,255,255,0.015);
  text-align:center; padding:20px;
}

/* =========================================================
   Timeline — experience / education
   ========================================================= */
.timeline{ display:flex; flex-direction:column; gap:0; }
.timeline-item{
  position:relative;
  padding: 0 0 46px 34px;
  border-left: 1px solid var(--border);
}
body.lang-ar .timeline-item{ border-left:none; border-right:1px solid var(--border); padding:0 34px 46px 0; }
.timeline-item:last-child{ padding-bottom:0; }


.timeline-item::before{
  content:""; position:absolute; left:-6px; top:4px;
  width:11px; height:11px; border-radius:50%;
  background: var(--bg); border:2px solid var(--blue);
}
body.lang-ar .timeline-item::before{ left:auto; right:-6px; }
.timeline-item .date{ font-size:0.8rem; color: var(--gold); font-weight:600; margin-bottom:6px; display:block; }

.timeline-item h3{ font-family: var(--font-display-en); font-size:1.15rem; font-weight:600; margin-bottom:4px; }
body.lang-ar .timeline-item h3{ font-family: var(--font-ar); font-weight:700; }
.timeline-item .org{ color: var(--text-dim); font-size:0.9rem; margin-bottom:14px; display:block; }

/* 
   Timeline logo */
.org-row{ display:flex; align-items:center; gap:10px; margin-bottom:14px; }
.org-row .org{ margin-bottom:0; }
.org-logo{
  width:40px; height:40px; flex-shrink:0; object-fit:contain;
  background:#ffffff00; border-radius:8px; border:1px solid var(--border); padding:4px;
}


.timeline-item ul{ display:flex; flex-direction:column; gap:8px; }
.timeline-item li{
  color: var(--text-dim); font-size:0.92rem; padding-left:18px; position:relative;
}
body.lang-ar .timeline-item li{ padding-left:0; padding-right:18px; }
.timeline-item li::before{
  content:"—"; position:absolute; left:0; color: var(--text-faint);
}
body.lang-ar .timeline-item li::before{ left:auto; right:0; }
.related-link{
  display:inline-flex; align-items:center; gap:6px; margin-top:12px;
  font-size:0.85rem; color: var(--blue);
}
.related-link:hover{ color: var(--gold); }



/* Publications —  zigzag timeline */
.pub-lede{
  font-size:1.05rem; font-weight:500; color: var(--text);
  border-left:3px solid var(--gold); padding-left:18px;
  margin: 4px 0 24px;
}
body.lang-ar .pub-lede{ border-left:none; border-right:3px solid var(--gold); padding-left:0; padding-right:18px; }

/* =========================================================
   Publications zigzag — (paper / conference / recognition)
   ========================================================= */
.pub-zigzag{ position:relative; max-width:900px; margin:0 auto; }
.pub-zigzag::before{
  content:""; position:absolute; left:50%; top:0; bottom:0;
  width:1px; background: var(--border); transform:translateX(-50%);
}
.zigzag-item{ position:relative; display:flex; margin-bottom:60px; }
.zigzag-item:last-child{ margin-bottom:0; }
.zigzag-item .card{ max-width:420px; width:100%; }
.zigzag-item .dot{
  position:absolute; top:34px; left:50%; transform:translateX(-50%);
  width:13px; height:13px; border-radius:50%;
  background: var(--bg); border:2px solid var(--gold); z-index:2;
}
/* odd items sit left of the line, even items sit right of it */
.zigzag-item:nth-child(odd){ justify-content:flex-end; padding-right:calc(50% + 30px); }
.zigzag-item:nth-child(even){ justify-content:flex-start; padding-left:calc(50% + 30px); }
/* mirrored for Arabic: odd goes right, even goes left */
body.lang-ar .zigzag-item:nth-child(odd){ justify-content:flex-start; padding-right:0; padding-left:calc(50% + 30px); }
body.lang-ar .zigzag-item:nth-child(even){ justify-content:flex-end; padding-left:0; padding-right:calc(50% + 30px); }

@media(max-width:820px){
  .pub-zigzag::before{ left:6px; transform:none; }
  .zigzag-item, body.lang-ar .zigzag-item{
    justify-content:flex-start !important;
    padding-left:34px !important; padding-right:0 !important;
  }
  .zigzag-item .dot{ left:6px; transform:none; }
  .zigzag-item .card{ max-width:none; }
}

/* keep Arabic text properly RTL inside each card even though the
   outer zigzag layout is forced ltr for consistent left/right positions */
body.lang-ar .pub-zigzag .card{ direction: rtl; }

@media(max-width:820px){
  .pub-zigzag::before{ left:20px; transform:none; }
  .zigzag-item{ width:100%; float:none; padding-left:44px; margin-bottom:40px; }
  .zigzag-item .dot{ left:14px; right:auto; }
}

/* Skills — ambient background canvas */
.skills-ambient-canvas{
  position: fixed; inset:0; z-index:0;
  width:100%; height:100%;
  opacity:0.28;
  pointer-events:none;
}

/* Skills — real-logo marquee */
.logo-marquee{
  position:relative; overflow:hidden;
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 10%, #000 90%, transparent);
          mask-image: linear-gradient(90deg, transparent, #000 10%, #000 90%, transparent);
}
.logo-marquee{
  position: relative;
  left: 50%;
  right: 50%;
  margin-left: -50vw;
  margin-right: -50vw;
  width: 100vw;
  direction: ltr;
}

.logo-track{
  display:flex; gap:14px; width:max-content; flex-shrink:0;
  animation: marquee-scroll 34s linear infinite;
}
.logo-marquee:hover .logo-track{ animation-play-state: paused; }
body.lang-ar .logo-track{ animation-direction: reverse; }
.logo-pill{
  display:flex; align-items:center; gap:10px; flex:0 0 auto;
  padding:11px 18px; border-radius:999px;
  background: var(--surface); border:1px solid var(--border);
  white-space:nowrap; transition: border-color .2s ease, transform .2s ease;
}
.logo-pill img{ width:22px; height:22px; flex-shrink:0; object-fit:contain; }
.logo-pill:hover{ border-color: var(--border-strong); transform: translateY(-2px); }
.logo-pill svg{ width:22px; height:22px; flex-shrink:0; }
.logo-pill b{ font-weight:600; font-size:0.9rem; color: var(--text); font-family: var(--font-body-en); }
.marquee-caption{
  text-align:center; color: var(--text-faint); font-size:0.82rem; margin-top:18px;
}
@keyframes marquee-scroll{
  from{ transform: translateX(0); }
  to{ transform: translateX(calc(-100% - 14px)); }
}

/* Skills — tag groups */
.skill-group{
  margin-bottom:22px; padding:26px 28px; border-radius: var(--radius);
  background: var(--surface); border:1px solid var(--border);
}
.skill-group h3{
  display:flex; align-items:center; gap:10px;
  font-family: var(--font-display-en); font-size:1rem; font-weight:600;
  color: var(--text); margin-bottom:16px; letter-spacing:0.02em;
}
.skill-group h3 .cat-icon{ width:20px; height:20px; flex-shrink:0; color: var(--blue); }
body.lang-ar .skill-group h3{ font-family: var(--font-ar); font-weight:700; }
.skill-tags{ display:flex; flex-wrap:wrap; gap:10px; }
.skill-tag{
  padding:9px 16px; border-radius:999px; font-size:0.88rem; color: var(--text-dim);
  cursor:default; transition: color .2s ease, background .2s ease, border-color .2s ease;
  border: 1px solid transparent;
  background:
    linear-gradient(var(--bg-alt), var(--bg-alt)) padding-box,
    linear-gradient(var(--border), var(--border)) border-box;
}
.skill-tag:hover{
  color:#fff;
  background:
    linear-gradient(var(--surface-hover), var(--surface-hover)) padding-box,
    linear-gradient(90deg, var(--blue), var(--violet)) border-box;
}

/* =========================================================
   Certifications — 3D coverflow carousel 
   ========================================================= */
.cert-carousel{ max-width:1100px; margin:0 auto; padding:0 32px; }
.cert-stage{
  position:relative;
  width:100%; min-height:360px;
  display:flex; align-items:center; justify-content:center;
  perspective:1400px;
  outline:none;
  overflow:hidden; 
}
/* matches the average aspect ratio across all certificate
   */
.cert-track{ position:relative; width:400px; height:258px; transform-style:preserve-3d; }
.cert-card-3d{
  position:absolute; left:50%; top:50%;
  width:400px; height:258px;
  border-radius: var(--radius);
  overflow:hidden;
  background: var(--surface);
  border:1px solid var(--border);
  cursor:pointer;
}
.cert-card-3d.is-active{
  border:2px solid var(--blue);
  box-shadow: 0 20px 50px rgba(78,127,255,0.35);
  cursor:default;
}
.cert-card-3d img{ width:100%; height:100%; object-fit:contain; display:block; }

.cert-caption{ text-align:center; margin-top:28px; }
.cert-caption strong{
  display:block; font-family: var(--font-display-en); font-size:1.1rem; font-weight:600; color: var(--text);
}
body.lang-ar .cert-caption strong{ font-family: var(--font-ar); font-weight:700; }
.cert-caption span{ display:block; font-size:0.85rem; color: var(--text-dim); margin-top:4px; }

/* "View Credential"*/
.cert-caption .cert-verify{
  display:inline-block; margin-top:10px;
  font-size:0.85rem; font-weight:600; color: var(--blue);
}
.cert-caption .cert-verify:hover{ color: var(--gold); }

body.lang-ar .cert-caption strong{ font-family: var(--font-ar); font-weight:700; }
.cert-caption span{ display:block; font-size:0.85rem; color: var(--text-dim); margin-top:4px; }
.cert-caption a:hover strong{ color: var(--blue); }

.cert-nav{ display:flex; align-items:center; justify-content:center; gap:20px; margin-top:26px; }
.cert-arrow{
  width:40px; height:40px; border-radius:50%;
  background: var(--surface); border:1px solid var(--border-strong); color: var(--text);
  font-size:1.1rem; cursor:pointer; transition: border-color .2s ease, opacity .2s ease;
}
.cert-arrow:hover:not(:disabled){ border-color: var(--blue); }
.cert-arrow:disabled{ opacity:0.3; cursor:default; }
.cert-dots{ display:flex; align-items:center; gap:8px; }
.cert-dot{
  width:8px; height:8px; border-radius:50%; padding:0;
  background: var(--border-strong); border:none; cursor:pointer;
}
.cert-dot.is-active{ background: linear-gradient(90deg,var(--blue),var(--violet)); width:22px; border-radius:999px; }

@media(max-width:600px){
  .cert-stage{ min-height:250px; }
  .cert-track{ width:270px; height:174px; }
  .cert-card-3d{ width:270px; height:174px; }
}

/* =========================================================
   Contact
   ========================================================= */
.contact-links{ display:flex; flex-direction:column; gap:0; margin-top:30px; }
.contact-link{
  display:flex; align-items:center; justify-content:space-between;
  padding: 18px 0; border-bottom:1px solid var(--border);
  font-family: var(--font-display-en); font-size:1.15rem; font-weight:500;
  transition: color .2s ease;
}
body.lang-ar .contact-link{ font-family: var(--font-ar); }
.contact-link:hover{ color: var(--gold); }
.contact-link:hover .contact-icon{ border-color: var(--border-strong); transform: translateY(-2px); }
.contact-link small{ font-family: var(--font-body-en); font-size:0.8rem; color: var(--text-faint); font-weight:400; }
.contact-left{ display:flex; align-items:center; gap:16px; }
.contact-icon{
  display:flex; align-items:center; justify-content:center; flex-shrink:0;
  width:44px; height:44px; border-radius:12px;
  background: var(--bg-alt); border:1px solid var(--border);
  color: var(--blue); transition: border-color .2s ease, transform .2s ease;
}
.contact-icon svg{ width:20px; height:20px; }
.contact-arrow{ flex-shrink:0; margin-inline-start:12px; }

/* Contact — "signal" broadcast mark beside the page title */
.signal-mark{
  position:absolute; top:50%; right:60px; transform:translateY(-50%);
  width:120px; height:120px; display:none; pointer-events:none;
}
@media (min-width:1000px){ .signal-mark{ display:block; } }
body.lang-ar .signal-mark{ right:auto; left:60px; }
.signal-core{
  position:absolute; top:50%; left:50%; width:14px; height:14px;
  margin:-7px 0 0 -7px; border-radius:50%;
  background: linear-gradient(135deg, var(--blue), var(--violet));
  box-shadow: 0 0 16px rgba(78,127,255,0.6);
}
.signal-ring{
  position:absolute; top:50%; left:50%; width:14px; height:14px;
  margin:-7px 0 0 -7px; border-radius:50%;
  border:1.5px solid var(--blue);
  animation: signal-pulse 3s ease-out infinite;
}
.signal-ring:nth-child(2){ animation-delay: 1s; border-color: var(--violet); }
.signal-ring:nth-child(3){ animation-delay: 2s; border-color: var(--gold); }
@keyframes signal-pulse{
  from{ width:14px; height:14px; margin:-7px 0 0 -7px; opacity:0.8; }
  to{ width:120px; height:120px; margin:-60px 0 0 -60px; opacity:0; }
}

/* =========================================================
   Footer
   ========================================================= */
.site-footer{
  border-top:1px solid var(--border);
  padding: 34px 0; text-align:center;
  color: var(--text-faint); font-size:0.82rem;
}

/* =========================================================
   Project detail pages (project-salam.html / project-seizable.html)
   — metric stat grid + interactive demo boxes
   ========================================================= */
.stat-grid{
  display:grid; grid-template-columns: repeat(auto-fit,minmax(140px,1fr));
  gap:18px; margin: 34px 0;
}
.stat-item{
  background: var(--surface); border:1px solid var(--border);
  border-radius: var(--radius-sm); padding:20px; text-align:center;
}
.stat-item .num{
  font-family: var(--font-display-en); font-size:1.7rem; font-weight:700;
  background: linear-gradient(90deg,var(--blue),var(--violet));
  -webkit-background-clip:text; background-clip:text; color:transparent;
  display:block; margin-bottom:6px;
}
.stat-item .label{ font-size:0.78rem; color: var(--text-dim); }

.demo-box{
  background: var(--surface); border:1px solid var(--border);
  border-radius: var(--radius); padding:28px; margin-top:10px;
}
.demo-note{
  font-size:0.78rem; color: var(--text-faint); margin-bottom:20px;
  display:flex; align-items:flex-start; gap:8px; line-height:1.5;
}
.demo-search-row{ display:flex; gap:10px; margin-bottom:16px; }
.demo-search-row input{
  flex:1; background: var(--bg-alt); border:1px solid var(--border-strong);
  border-radius:999px; padding:12px 18px; color:var(--text);
  font-family:inherit; font-size:0.92rem;
}
.demo-search-row input:focus{ outline:none; border-color:var(--blue); }
.demo-chips{ display:flex; flex-wrap:wrap; gap:8px; margin-bottom:22px; }
.demo-chip{
  background:none; border:1px solid var(--border-strong); color:var(--text-dim);
  border-radius:999px; padding:7px 14px; font-size:0.8rem; cursor:pointer;
  font-family:inherit; transition: all .2s ease;
}
.demo-chip:hover{ border-color:var(--blue); color:#fff; }
.demo-answer{
  background: var(--bg-alt); border:1px solid var(--border);
  border-radius: var(--radius-sm); padding:18px 20px; font-size:0.9rem;
  color: var(--text-dim); display:none;
}
.demo-answer.visible{ display:block; }
.demo-answer .citation{
  display:block; margin-top:10px; font-size:0.78rem; color:var(--gold);
}

.eeg-chart-wrap{
  background: var(--bg-alt); border:1px solid var(--border);
  border-radius: var(--radius-sm); min-height:320px; margin-bottom:18px;
}
.eeg-result{
  background: var(--bg-alt); border:1px solid var(--border);
  border-radius: var(--radius-sm); padding:16px 20px; font-size:0.9rem;
  color:var(--text-dim); display:none;
}
.eeg-result.visible{ display:block; }
.eeg-result strong{ color: var(--text); }

/* =========================================================
   Utility
   ========================================================= */
.text-center{ text-align:center; }
.mt-40{ margin-top:40px; }
[data-animate]{ opacity:0; transform: translateY(18px); transition: opacity .6s ease, transform .6s ease; }
[data-animate].in-view{ opacity:1; transform:none; }

@media (prefers-reduced-motion: reduce){
  [data-animate]{ opacity:1; transform:none; transition:none; }
  .logo-track{ animation: none; } 
    .signal-ring{ animation: none; opacity:0; }
}