/* === variables.css === */
/* ============================================
   AI Era — CSS Custom Properties (Design Tokens)
   ============================================ */
:root{
  --bg:#030305;
  --surface:rgba(255,255,255,.035);
  --surface-2:rgba(8,8,16,.72);
  --border:rgba(255,255,255,.085);
  --text:#fff;
  --muted:#8a8a93;
  --indigo:#818cf8;
  --indigo-2:#a5b4fc;
  --cyan:#67e8f9;
  --purple:#c084fc;

  /* Spacing */
  --space-xs:8px;
  --space-sm:14px;
  --space-md:20px;
  --space-lg:28px;
  --space-xl:42px;

  /* Radii */
  --radius-sm:9px;
  --radius-md:18px;
  --radius-lg:20px;
  --radius-pill:999px;

  /* Fonts */
  --font-sans:"Plus Jakarta Sans",sans-serif;
  --font-mono:"JetBrains Mono",monospace;
}

:root[data-theme="light"],
[data-theme="light"]{
  /* Nền */
  --bg: #F6F7FB;
  --surface: #FFFFFF;
  --surface-2: #FFFFFF;
  --border: #E7E9F2;

  /* Chữ */
  --text: #161832;        /* navy đậm — dùng cho heading, không dùng đen thuần */
  --text-muted: #666B85;  /* xám ánh navy — dùng cho mô tả, label phụ */
  --muted: #666B85;

  /* Accent */
  --accent: #3D4FE0;      /* xanh điện — chấm bullet, số liệu, icon nhấn */
  --accent2: #8B5CF6;     /* tím — node, orbit, gradient heading */
  --indigo: #3D4FE0;
  --indigo-2: #8B5CF6;
  --cyan: #0284c7;
  --purple: #8B5CF6;

  /* Gradient dùng cho heading/logo chữ */
  --gradient-text: linear-gradient(150deg, #1B1D3D 0%, #2A2B57 45%, #4C3E8F 100%);
}


/* === base.css === */
/* ============================================
   AI Era — Base / Reset
   ============================================ */
*{box-sizing:border-box;margin:0;padding:0}

html{
  width:100%;
  min-height:100%;
  scroll-behavior:smooth;
}

body{
  width:100%;
  min-height:100%;
  overflow-x:hidden;
  overflow-y:auto;
  background:var(--bg);
  color:var(--text);
  font-family:var(--font-sans);
  -webkit-font-smoothing:antialiased;
  cursor:none;
  transition:background-color .35s ease, color .35s ease;
  background:
    radial-gradient(circle at 50% 42%, rgba(99,102,241,.075), transparent 28%),
    radial-gradient(circle at 50% 50%, #06060a 0%, #030305 58%, #020203 100%);
}

[data-theme="light"] body{
  background: #F6F7FB;
}

/* WebGL canvas container */
#webgl{position:fixed;inset:0;z-index:0}
#webgl canvas{display:block;width:100%;height:100%;touch-action:none}

/* Grain overlay */
.grain{
  position:fixed;inset:0;z-index:1;pointer-events:none;opacity:.045;mix-blend-mode:screen;
  background-image:url("data:image/svg+xml,%3Csvg viewBox='0 0 160 160' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.95' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.8'/%3E%3C/svg%3E");
}
[data-theme="light"] .grain{
  display:none;
}

/* Vignette overlay */
.vignette{
  position:fixed;inset:0;z-index:2;pointer-events:none;
  box-shadow:inset 0 0 180px rgba(0,0,0,.5);
  transition:box-shadow .35s ease;
}
[data-theme="light"] .vignette{
  display:none;
}


/* === typography.css === */
/* ============================================
   AI Era — Typography
   ============================================ */

/* ----- Intro Section ----- */
.intro h1{
  font-size:clamp(2.2rem,4.5vw,5rem);
  line-height:.97;
  letter-spacing:-.065em;
  font-weight:700;
  background:linear-gradient(180deg,#fff 24%,#8f8f9a 100%);
  -webkit-background-clip:text;
  background-clip:text;
  color:transparent;
}
.intro p{
  margin-top:18px;
  color:var(--muted);
  font-size:.88rem;
  line-height:1.7;
  max-width:335px;
}

/* ----- AI Era Core Label ----- */
.core-label{
  position:absolute;left:50%;top:50%;
  transform:translate(-50%,-50%);
  width:178px;height:178px;border-radius:50%;
  display:grid;place-items:center;text-align:center;
  pointer-events:none;transition:opacity .2s;
}

/* ★ UPGRADED: gradient 4 màu + glow multi-layer + animate chuyển màu 9s */
.core-label strong{
  display:block;
  font-family:var(--font-sans);
  font-weight:800;
  font-size:clamp(2.4rem, 6vw, 4.2rem);
  letter-spacing:-0.02em;
  line-height:1;

  background:linear-gradient(
    100deg,
    #ffffff 0%,
    #e4d9ff 22%,
    #c9b8ff 40%,
    #a5b4fc 58%,
    #818cf8 75%,
    #67e8f9 100%
  );
  background-size:220% 220%;
  -webkit-background-clip:text;
  background-clip:text;
  color:transparent;

  animation: aiEraGradientShift 9s ease-in-out infinite;

  /* multi-layer glow */
  filter:
    drop-shadow(0 0 6px rgba(255,255,255,.55))
    drop-shadow(0 0 18px rgba(129,140,248,.55))
    drop-shadow(0 0 36px rgba(103,232,249,.35))
    drop-shadow(0 0 60px rgba(192,132,252,.25));
}

.core-label span{
  display:block;margin-top:12px;color:#b9b9c6;
  font:500 .58rem var(--font-mono);
  letter-spacing:.23em;text-transform:uppercase;
  text-shadow:0 0 14px rgba(129,140,248,.8);
}

/* Light theme core label per light-mode-guide.md: gradient text, clean typography */
[data-theme="light"] .core-label strong{
  font-weight:700;
  letter-spacing:-0.025em;
  color: #161832;
  background: var(--gradient-text);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  filter: drop-shadow(0 14px 28px rgba(139, 92, 246, 0.25));
  animation:none;
}

[data-theme="light"] .core-label span{
  color: var(--accent);
  font-weight:700;
  letter-spacing:.25em;
  text-shadow:none;
  background: var(--surface);
  padding:3px 10px;
  border-radius:var(--radius-pill);
  display:inline-block;
  border:1px solid var(--border);
  box-shadow:0 8px 24px rgba(20, 20, 50, 0.06);
}

/* ----- Node Label Text ----- */
.node-label small{
  color:#555562;
  font:400 .58rem var(--font-mono);
  letter-spacing:.06em;
}

/* ----- Badge ----- */
.badge{
  display:inline-flex;align-items:center;gap:8px;
  padding:6px 12px;border-radius:var(--radius-pill);
  border:1px solid rgba(129,140,248,.28);
  background:rgba(129,140,248,.08);
  color:#a5b4fc;
  font:500 .68rem var(--font-mono);
  margin-bottom:18px;
}
.badge i{
  width:5px;height:5px;border-radius:50%;
  background:#a5b4fc;box-shadow:0 0 10px #818cf8;
}

/* ----- Focus Panel Typography ----- */
.focus-kicker{
  color:#a5b4fc;
  font:500 .61rem var(--font-mono);
  letter-spacing:.08em;
}
.focus-panel h2{
  font-size:1.35rem;
  letter-spacing:-.04em;
  margin:9px 0 8px;
}
.focus-panel p{
  font-size:.78rem;
  line-height:1.65;
  color:var(--muted);
}

/* ----- HUD Typography ----- */
.hud-head b{font-size:.72rem;font-weight:600}
.hud-head em{
  font-style:normal;color:#777784;
  font:400 .58rem var(--font-mono);
}
.hud-row{
  display:flex;justify-content:space-between;
  margin-bottom:10px;
  font:400 .61rem var(--font-mono);
  color:#656572;
}
.hud-row span:last-child{color:#a5b4fc}
.hud-copy{
  padding-top:10px;
  border-top:1px solid rgba(255,255,255,.055);
  font-size:.72rem;color:#8a8a93;line-height:1.6;
}


/* === layout.css === */
/* ============================================
   AI Era — Layout
   ============================================ */

/* ----- Navigation ----- */
.site-nav{
  position:fixed;left:0;right:0;top:0;z-index:30;
  display:flex;align-items:center;justify-content:space-between;
  padding:22px var(--space-xl);
  border-bottom:1px solid var(--border);
  background:linear-gradient(180deg,rgba(3,3,5,.82),rgba(3,3,5,.48));
  backdrop-filter:blur(16px);
}
.logo{
  display:flex;align-items:center;gap:10px;
  font-weight:700;font-size:1.12rem;letter-spacing:-.45px;
}
.logo span{color:var(--indigo)}

.logo-img{
  width:32px;height:32px;object-fit:contain;display:block;
  filter:drop-shadow(0 0 10px rgba(168,85,247,.45));
  transition:transform .3s ease, filter .3s ease;
}
.logo:hover .logo-img{
  transform:scale(1.08) rotate(3deg);
  filter:drop-shadow(0 0 16px rgba(168,85,247,.75));
}

.logo-mark{
  width:22px;height:22px;
  border:1px solid rgba(165,180,252,.7);
  border-radius:7px;
  display:grid;place-items:center;position:relative;
  box-shadow:inset 0 0 14px rgba(129,140,248,.12),0 0 18px rgba(99,102,241,.09);
}
.logo-mark:before,.logo-mark:after{content:"";position:absolute;background:#a5b4fc}
.logo-mark:before{width:10px;height:1px}
.logo-mark:after{height:10px;width:1px}


.nav-status{
  font-family:var(--font-mono);font-size:.67rem;color:#a5b4fc;
  border:1px solid rgba(129,140,248,.22);
  background:rgba(129,140,248,.07);
  padding:7px 11px;border-radius:var(--radius-pill);
}

/* ----- Intro Section ----- */
.intro{
  position:fixed;left:var(--space-xl);top:112px;
  z-index:18;max-width:365px;pointer-events:none;
}

/* ----- Labels Container ----- */
#labels{position:fixed;inset:0;z-index:24;pointer-events:none}

/* ----- Controls bar ----- */
.controls{
  position:fixed;left:var(--space-xl);bottom:32px;z-index:20;
  display:flex;align-items:center;gap:9px;
}


/* === components.css === */
/* ============================================
   AI Era — Components
   ============================================ */

/* ----- Node Labels ----- */
.node-label{
  position:absolute;left:0;top:0;
  transform:translate(-50%,-50%);
  pointer-events:auto;cursor:none;white-space:nowrap;
  display:flex;align-items:center;gap:10px;
  padding:10px 13px;border-radius:11px;
  color:#dcdce2;font-size:.74rem;font-weight:600;
  border:1px solid rgba(255,255,255,.08);
  background:rgba(8,8,14,.64);
  backdrop-filter:blur(14px);
  box-shadow:0 12px 38px rgba(0,0,0,.22);
  transition:border-color .25s,background .25s,transform .25s,opacity .2s,color .25s;
  will-change:transform,left,top;
}
.node-label:before{
  content:"";width:5px;height:5px;border-radius:50%;
  background:var(--node-color,#a5b4fc);
  box-shadow:0 0 12px var(--node-color,#a5b4fc);
}
.node-label:hover,.node-label.active{
  color:#fff;
  border-color:color-mix(in srgb,var(--node-color) 55%,transparent);
  background:rgba(14,14,23,.84);
  transform:translate(-50%,-50%) scale(1.055);
}

/* ----- HUD Panel ----- */
.hud{
  position:fixed;right:var(--space-lg);top:105px;z-index:18;width:248px;
  border:1px solid var(--border);border-radius:var(--radius-md);
  background:rgba(7,7,12,.62);
  backdrop-filter:blur(18px);
  overflow:hidden;
  box-shadow:0 24px 70px rgba(0,0,0,.28);
}
.hud-head{
  padding:var(--space-sm) 16px;
  border-bottom:1px solid var(--border);
  display:flex;justify-content:space-between;align-items:center;
}
.hud-body{padding:15px 16px}

/* ----- Focus Panel (glassmorphism) ----- */
.focus-panel{
  position:fixed;right:var(--space-lg);bottom:var(--space-lg);z-index:26;
  width:min(380px,calc(100vw - 48px));
  border:1px solid rgba(255,255,255,0.12);
  background:rgba(12,14,24,0.85);
  backdrop-filter:blur(24px) saturate(180%);
  -webkit-backdrop-filter:blur(24px) saturate(180%);
  border-radius:var(--radius-lg);
  padding:22px 20px 20px;
  box-shadow:0 20px 48px -12px rgba(0,0,0,0.65), 0 0 0 1px rgba(255,255,255,0.06);
  transform:translateY(22px);opacity:0;pointer-events:none;
  transition:.35s cubic-bezier(.2,.8,.2,1);
}
.focus-panel.show{transform:none;opacity:1;pointer-events:auto}

/* Focus actions container */
.focus-actions{
  display:flex;
  flex-direction:column;
  gap:9px;
  margin-top:18px;
}

/* PRIMARY CTA: Focus detail link (Eye-catching, high-converting) */
.focus-detail-link{
  display:flex;
  align-items:center;
  justify-content:center;
  width:100%;
  box-sizing:border-box;
  padding:11px 18px;
  background:linear-gradient(135deg, #6366f1 0%, #3b82f6 50%, #06b6d4 100%);
  background-size:200% 200%;
  color:#ffffff !important;
  font-family:var(--font-sans);
  font-size:.82rem;
  font-weight:700;
  letter-spacing:.02em;
  text-decoration:none;
  border-radius:var(--radius-pill);
  border:1px solid rgba(255,255,255,0.25);
  box-shadow:0 4px 20px rgba(99,102,241,0.45), 0 0 14px rgba(6,182,212,0.3);
  cursor:none;
  transition:all .25s cubic-bezier(.2,.8,.2,1);
  position:relative;
  overflow:hidden;
}
.focus-detail-link::after{
  content:"→";
  display:inline-block;
  margin-left:7px;
  font-size:.92rem;
  transition:transform .2s ease;
}
.focus-detail-link:hover{
  background-position:100% 50%;
  color:#ffffff !important;
  transform:translateY(-2px);
  box-shadow:0 8px 28px rgba(99,102,241,0.65), 0 0 22px rgba(6,182,212,0.5);
  border-color:rgba(255,255,255,0.4);
}
.focus-detail-link:hover::after{
  transform:translateX(4px);
}
.focus-detail-link:active{
  transform:translateY(0) scale(.98);
}

/* SECONDARY BUTTON: Return to AI Era core (Subtle ghost button) */
.focus-panel button,
.focus-back-btn{
  display:flex;
  align-items:center;
  justify-content:center;
  width:100%;
  box-sizing:border-box;
  margin-top:0;
  border:1px solid rgba(255,255,255,0.12);
  border-radius:var(--radius-pill);
  padding:8px 14px;
  background:rgba(255,255,255,0.04);
  color:rgba(255,255,255,0.62);
  font-family:var(--font-sans);
  font-weight:500;
  font-size:.73rem;
  letter-spacing:.01em;
  cursor:none;
  transition:all .2s ease;
}
.focus-panel button::before,
.focus-back-btn::before{
  content:"←";
  display:inline-block;
  margin-right:6px;
  font-size:.82rem;
  opacity:.65;
  transition:transform .2s ease, opacity .2s ease;
}
.focus-panel button:hover,
.focus-back-btn:hover{
  background:rgba(255,255,255,0.09);
  color:#ffffff;
  border-color:rgba(255,255,255,0.25);
  transform:translateY(-1px);
}
.focus-panel button:hover::before,
.focus-back-btn:hover::before{
  opacity:1;
  transform:translateX(-3px);
}
.focus-panel button:active,
.focus-back-btn:active{
  transform:translateY(0);
}

/* ----- Control Buttons ----- */
.control{
  border:1px solid var(--border);
  background:rgba(255,255,255,.028);color:#90909c;
  font:500 .61rem var(--font-mono);
  padding:8px 10px;border-radius:var(--radius-sm);
  backdrop-filter:blur(12px);
}
button.control{cursor:none;transition:.25s}
button.control:hover{
  color:#fff;
  border-color:rgba(129,140,248,.38);
  background:rgba(129,140,248,.08);
}

/* ----- HUD Controls ----- */
.hud-controls{
  display:flex;
  flex-wrap:wrap;
  gap:5px;
  margin-top:10px;
  padding-top:10px;
  border-top:1px solid rgba(255,255,255,.055);
}
.hud-controls .control{
  font-size:.56rem;
  padding:5px 7px;
  letter-spacing:.02em;
  flex:1 1 auto;
  text-align:center;
}
.hud-controls #resetBtn{
  width:100%;
  flex:1 1 100%;
  margin-top:2px;
  background:rgba(129,140,248,.12);
  border-color:rgba(129,140,248,.3);
  color:#c7d2fe;
}
.hud-controls #resetBtn:hover{
  background:rgba(129,140,248,.25);
  color:#fff;
  border-color:rgba(129,140,248,.55);
}

/* ----- 3D Holographic Contact CTA Button ----- */
.contact-cta-btn{
  position:relative;
  display:inline-flex;align-items:center;gap:12px;
  padding:7px 20px 7px 9px;
  border-radius:var(--radius-pill);
  border:1px solid rgba(129,140,248,.38);
  background:linear-gradient(135deg, rgba(16,16,32,.88) 0%, rgba(8,8,18,.95) 100%);
  backdrop-filter:blur(24px) saturate(180%);
  -webkit-backdrop-filter:blur(24px) saturate(180%);
  box-shadow:0 10px 30px rgba(0,0,0,.45), 0 0 25px rgba(99,102,241,.24), inset 0 1px 0 rgba(255,255,255,.18);
  text-decoration:none;
  cursor:none;
  transition:transform .35s cubic-bezier(.2,.8,.2,1), border-color .3s, box-shadow .35s;
  overflow:hidden;
}
.contact-cta-btn:hover{
  transform:translateY(-3px) scale(1.04);
  border-color:rgba(103,232,249,.7);
  box-shadow:0 16px 42px rgba(0,0,0,.55), 0 0 35px rgba(129,140,248,.5), 0 0 20px rgba(103,232,249,.4), inset 0 1px 0 rgba(255,255,255,.35);
}
.contact-cta-canvas-wrap{
  width:50px;height:50px;min-width:50px;
  position:relative;border-radius:50%;
  display:flex;align-items:center;justify-content:center;
  background:radial-gradient(circle, rgba(129,140,248,.25) 0%, rgba(10,10,24,0) 70%);
}
#contactBtnCanvas{
  width:50px;height:50px;display:block;
  border-radius:50%;pointer-events:none;
}
.contact-cta-halo{
  position:absolute;inset:-3px;border-radius:50%;
  border:1px solid rgba(103,232,249,.35);
  animation:cta-halo-pulse 2.4s infinite ease-in-out;
  pointer-events:none;
}
.contact-cta-text{
  display:flex;flex-direction:column;gap:2px;
  text-align:left;
}
.contact-cta-badge{
  display:inline-flex;align-items:center;gap:5px;
  font:600 .58rem var(--font-mono);color:#a5b4fc;
  letter-spacing:.08em;text-transform:uppercase;
}
.contact-cta-dot{
  width:6px;height:6px;border-radius:50%;
  background:#4ade80;
  box-shadow:0 0 8px #4ade80, 0 0 16px rgba(74,222,128,.6);
  animation:cta-dot-blink 1.8s infinite ease-in-out;
}
.contact-cta-title{
  display:inline-flex;align-items:center;gap:7px;
  font:700 .92rem var(--font-sans);color:#fff;
  letter-spacing:.025em;line-height:1.2;
}
.contact-cta-arrow{
  color:#67e8f9;
  animation:cta-arrow-drift 1.5s infinite ease-in-out;
}
@keyframes cta-halo-pulse{
  0%,100%{transform:scale(.95);opacity:.35;border-color:rgba(103,232,249,.3)}
  50%{transform:scale(1.18);opacity:.85;border-color:rgba(192,132,252,.65)}
}
@keyframes cta-dot-blink{
  0%,100%{opacity:.5;transform:scale(.85)}
  50%{opacity:1;transform:scale(1.25)}
}
@keyframes cta-arrow-drift{
  0%,100%{transform:translateY(0)}
  50%{transform:translateY(4px)}
}

/* ----- Custom Cursor ----- */
.cursor-dot,.cursor-outline{
  position:fixed;left:0;top:0;border-radius:50%;
  pointer-events:none;z-index:10000;
  transform:translate(-50%,-50%);
  will-change:transform;
}
.cursor-dot{
  width:5px;height:5px;background:#fff;
  box-shadow:0 0 10px rgba(255,255,255,.55);
}
.cursor-outline{
  width:34px;height:34px;
  border:1px solid rgba(255,255,255,.34);
  background:rgba(255,255,255,.018);
  backdrop-filter:blur(1px);
  transition:width .18s,height .18s,border-color .18s,background .18s;
}
body.hovering .cursor-outline{
  width:46px;height:46px;
  border-color:rgba(129,140,248,.65);
  background:rgba(129,140,248,.06);
}
body.dragging .cursor-outline{
  width:58px;height:58px;
  border-color:rgba(103,232,249,.65);
}

/* ----- Language Switch ----- */
.lang-switch{
  display:flex;align-items:center;gap:3px;
  padding:3px;border-radius:var(--radius-pill);
  border:1px solid var(--border);
  background:rgba(8,8,14,.58);
  backdrop-filter:blur(14px);
  box-shadow:0 4px 20px rgba(0,0,0,.18);
}
.lang-btn{
  border:none;outline:none;cursor:none;
  font:600 .62rem var(--font-mono);
  color:#8a8a93;letter-spacing:.06em;
  padding:6px 11px;border-radius:var(--radius-pill);
  background:transparent;
  transition:all .28s cubic-bezier(.2,.8,.2,1);
  position:relative;
}
.lang-btn:hover{
  color:#dcdce2;
  background:rgba(129,140,248,.08);
  transform:scale(1.06);
}
.lang-btn.active{
  color:#fff;
  background:linear-gradient(135deg,rgba(129,140,248,.32),rgba(103,232,249,.22));
  box-shadow:0 0 14px rgba(129,140,248,.18),inset 0 0 8px rgba(165,180,252,.08);
}
.lang-btn.active::after{
  content:"";position:absolute;inset:-1px;border-radius:inherit;
  background:linear-gradient(135deg,rgba(129,140,248,.25),rgba(103,232,249,.15));
  opacity:0;transition:opacity .25s;z-index:-1;
}
.lang-btn.active:hover::after{opacity:1}

/* ----- Theme Switch (Day / Night) — Hidden (Default Dark Mode) ----- */
.theme-switch{
  display:none !important;
}
.theme-btn{
  border:none;outline:none;cursor:none;
  width:28px;height:28px;border-radius:50%;
  display:grid;place-items:center;
  background:transparent;
  color:#8a8a93;
  transition:all .28s cubic-bezier(.2,.8,.2,1);
  padding:0;
}
.theme-btn svg{
  width:14px;height:14px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;
  transition:transform .3s,color .3s;
}
.theme-btn:hover{
  color:#dcdce2;
  background:rgba(129,140,248,.12);
  transform:scale(1.08);
}
.theme-btn.active{
  color:#fff;
  background:linear-gradient(135deg,rgba(129,140,248,.36),rgba(103,232,249,.24));
  box-shadow:0 0 12px rgba(129,140,248,.25);
}
.theme-btn.active svg{
  transform:rotate(12deg);
}

/* ----- Light Theme Overrides for Components (per light-mode-guide.md) ----- */
[data-theme="light"] nav{
  background: rgba(246, 247, 251, 0.85);
  border-bottom-color: var(--border);
}
[data-theme="light"] .nav-status{
  color: var(--accent);
  border-color: var(--border);
  background: var(--surface);
  box-shadow: 0 2px 8px rgba(20, 20, 50, 0.04);
}
[data-theme="light"] .logo{
  font-weight: 700;
  letter-spacing: 1.5px;
  color: #232645;
}
[data-theme="light"] .logo .logo-img{
  filter: none;
}
[data-theme="light"] .logo span{
  color: #A6ABC4;
  font-weight: 500;
}
[data-theme="light"] .badge{
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--accent);
  font-weight: 700;
  box-shadow: 0 4px 14px rgba(20, 20, 50, 0.05);
}
[data-theme="light"] .badge i{
  background: var(--accent);
  box-shadow: 0 0 8px rgba(61, 79, 224, 0.4);
}
[data-theme="light"] .intro h1{
  font-weight: 700;
  letter-spacing: -0.025em;
  color: var(--text);
  background: var(--gradient-text);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  filter: none;
}
[data-theme="light"] .intro p{
  color: var(--text-muted);
  font-weight: 500;
  background: var(--surface);
  padding: 14px 18px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  box-shadow: 0 8px 24px rgba(20, 20, 50, 0.06);
}
[data-theme="light"] .hud{
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  box-shadow: 0 8px 24px rgba(20, 20, 50, 0.06);
}
[data-theme="light"] .hud-head{
  border-color: var(--border);
  background: #FAFBFD;
}
[data-theme="light"] .hud-head b{
  color: var(--text);
  font-weight: 700;
}
[data-theme="light"] .hud-head em{
  color: var(--accent);
  background: rgba(61, 79, 224, 0.08);
  border: 1px solid rgba(61, 79, 224, 0.2);
  font-weight: 700;
}
[data-theme="light"] .hud-row{
  color: var(--text-muted);
  font-weight: 600;
  border-color: var(--border);
}
[data-theme="light"] .hud-row span:last-child{
  color: var(--text);
  font-weight: 700;
}
[data-theme="light"] .hud-copy{
  color: var(--text-muted);
  font-weight: 500;
  background: #FAFBFD;
  border: 1px solid var(--border);
  padding: 8px 10px;
  border-radius: var(--radius-sm);
  margin-top: 6px;
  line-height: 1.5;
}
[data-theme="light"] .control{
  color: var(--text);
  font-weight: 600;
  border: 1px solid var(--border);
  background: var(--surface);
  box-shadow: 0 2px 6px rgba(20, 20, 50, 0.04);
}
[data-theme="light"] .control:hover{
  color: var(--accent);
  background: #FAFBFD;
  border-color: var(--accent);
  box-shadow: 0 4px 12px rgba(61, 79, 224, 0.12);
}
[data-theme="light"] .hud-controls #resetBtn{
  background: var(--accent);
  border-color: var(--accent);
  color: #ffffff;
  font-weight: 700;
  box-shadow: 0 4px 12px rgba(61, 79, 224, 0.25);
}
[data-theme="light"] .hud-controls #resetBtn:hover{
  background: #2f3ec0;
  border-color: #2f3ec0;
  color: #ffffff;
}
[data-theme="light"] .contact-cta-btn{
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  box-shadow: 0 8px 24px rgba(20, 20, 50, 0.08);
}
[data-theme="light"] .contact-cta-btn:hover{
  border-color: var(--accent);
  box-shadow: 0 12px 30px rgba(61, 79, 224, 0.18);
}
[data-theme="light"] .contact-cta-btn .contact-cta-title{
  color: var(--text);
}
[data-theme="light"] .contact-cta-btn .contact-cta-badge{
  color: var(--accent);
  font-weight: 700;
}
[data-theme="light"] .contact-cta-btn .contact-cta-arrow{
  color: var(--accent);
}
[data-theme="light"] .contact-cta-canvas-wrap{
  background: radial-gradient(circle, rgba(61, 79, 224, 0.12) 0%, rgba(246, 247, 251, 0) 70%);
}
[data-theme="light"] .focus-panel{
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid rgba(0, 0, 0, 0.09);
  box-shadow: 0 16px 40px -10px rgba(20, 20, 50, 0.15), 0 0 0 1px rgba(0, 0, 0, 0.04);
}
[data-theme="light"] .focus-kicker{
  color: var(--accent);
  font-weight: 700;
}
[data-theme="light"] .focus-title{
  color: var(--text);
  font-weight: 800;
}
[data-theme="light"] .focus-desc{
  color: var(--text-muted);
  font-weight: 500;
  line-height: 1.65;
}
[data-theme="light"] .focus-detail-link{
  background: linear-gradient(135deg, #4f46e5 0%, #2563eb 50%, #0284c7 100%);
  color: #ffffff !important;
  border: 1px solid rgba(255, 255, 255, 0.3);
  box-shadow: 0 4px 18px rgba(79, 70, 229, 0.35), 0 2px 8px rgba(2, 132, 199, 0.25);
}
[data-theme="light"] .focus-detail-link:hover{
  box-shadow: 0 8px 25px rgba(79, 70, 229, 0.5), 0 4px 14px rgba(2, 132, 199, 0.35);
}
[data-theme="light"] .focus-panel button,
[data-theme="light"] .focus-back-btn{
  background: rgba(0, 0, 0, 0.03);
  color: #64748b;
  border: 1px solid rgba(0, 0, 0, 0.12);
}
[data-theme="light"] .focus-panel button:hover,
[data-theme="light"] .focus-back-btn:hover{
  background: rgba(0, 0, 0, 0.06);
  color: #0f172a;
  border-color: rgba(0, 0, 0, 0.22);
}
/* Node Cards per Section 3.3 */
[data-theme="light"] .node-label{
  color: var(--text);
  font-weight: 600;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  box-shadow: 0 8px 24px rgba(20, 20, 50, 0.06);
}
[data-theme="light"] .node-label::before{
  background: var(--accent);
  box-shadow: none;
}
[data-theme="light"] .node-label small{
  color: var(--text-muted);
  font-weight: 600;
}
[data-theme="light"] .node-label:hover, [data-theme="light"] .node-label.active{
  color: var(--text);
  background: var(--surface);
  border-color: var(--accent);
  box-shadow: 0 10px 28px rgba(61, 79, 224, 0.15);
}
[data-theme="light"] .lang-switch, [data-theme="light"] .theme-switch{
  background: var(--surface);
  border: 1px solid var(--border);
  box-shadow: 0 2px 10px rgba(20, 20, 50, 0.04);
}
[data-theme="light"] .lang-btn, [data-theme="light"] .theme-btn{
  color: var(--text-muted);
}
[data-theme="light"] .lang-btn:hover, [data-theme="light"] .theme-btn:hover{
  color: var(--text);
  background: #FAFBFD;
}
[data-theme="light"] .lang-btn.active{
  color: #ffffff;
  background: var(--accent);
  box-shadow: 0 2px 6px rgba(61, 79, 224, 0.25);
}
[data-theme="light"] .theme-btn.active{
  color: #ffffff;
  background: var(--accent);
  box-shadow: 0 2px 6px rgba(61, 79, 224, 0.25);
}
[data-theme="light"] .cursor-dot{
  background: var(--accent);
  box-shadow: 0 0 6px rgba(61, 79, 224, 0.4);
}
[data-theme="light"] .cursor-outline{
  border-color: rgba(61, 79, 224, 0.35);
}

/* ----- Service Grid & Cards (services.html) ----- */
.service-grid{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(300px,1fr));
  gap:16px;
  margin:28px 0 40px;
}
.service-card{
  display:flex;
  flex-direction:column;
  padding:22px;
  border-radius:var(--radius-md);
  border:1px solid var(--border);
  background:var(--surface);
  text-decoration:none;
  transition:all .28s cubic-bezier(.2,.8,.2,1);
}
.service-card:hover{
  border-color:rgba(129,140,248,.45);
  background:rgba(129,140,248,.06);
  transform:translateY(-3px);
  box-shadow:0 12px 28px rgba(0,0,0,.35);
}
[data-theme="light"] .service-card:hover{
  border-color:rgba(79,70,229,.45);
  background:rgba(79,70,229,.04);
  box-shadow:0 12px 28px rgba(79,70,229,.08);
}
.service-card h3{
  font-size:1.05rem;
  font-weight:700;
  color:var(--text);
  margin:0 0 8px 0;
  transition:color .25s ease;
}
.service-card:hover h3{
  color:var(--cyan);
}
[data-theme="light"] .service-card:hover h3{
  color:#0284c7;
}
.service-card p{
  font-size:.84rem;
  line-height:1.65;
  color:var(--muted);
  margin:0;
}

/* ----- Header Nav Links & Footer Links ----- */
.nav-links{
  display:flex;
  align-items:center;
  gap:20px;
}
.nav-link{
  font-size:.84rem;
  font-weight:600;
  color:var(--muted);
  text-decoration:none;
  position:relative;
  padding-left:14px;
  transition:color .2s ease;
}
.nav-link::before{
  content:"";
  position:absolute;
  left:0;
  top:50%;
  transform:translateY(-50%);
  width:5px;
  height:5px;
  border-radius:50%;
  background:var(--node-color, var(--indigo-2));
  box-shadow:0 0 8px var(--node-color, var(--indigo-2));
}
.nav-link:hover{
  color:var(--cyan);
}
[data-theme="light"] .nav-link:hover{
  color:#0f172a;
}
@media(max-width:640px){
  .nav-links{gap:12px;}
  .nav-link{font-size:.78rem;}
}

/* ----- Constellation Bar (thay thế .footer-links cũ) ----- */
.footer-links{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
  max-width:760px;
  margin:56px auto 0;
  padding:18px 20px;
  border-top:1px solid var(--border);
}
.footer-links a{
  display:inline-flex;
  align-items:center;
  gap:7px;
  padding:7px 13px;
  border-radius:var(--radius-pill);
  border:1px solid var(--border);
  background:rgba(255,255,255,.02);
  color:var(--muted);
  font-size:.72rem;
  font-weight:600;
  text-decoration:none;
  letter-spacing:.01em;
  transition:all .25s cubic-bezier(.2,.8,.2,1);
}
.footer-links a::before{
  content:"";
  width:5px;
  height:5px;
  border-radius:50%;
  background:var(--node-color, var(--indigo-2));
  box-shadow:0 0 6px var(--node-color, var(--indigo-2));
  flex-shrink:0;
}
.footer-links a:hover{
  color:#fff;
  border-color:color-mix(in srgb, var(--node-color, var(--indigo-2)) 55%, transparent);
  background:rgba(129,140,248,.06);
  transform:translateY(-2px);
}
[data-theme="light"] .footer-links a{
  background:#fff;
  color:var(--text-muted);
}

/* ----- Hamburger Menu & Dropdown Panel (Three.js 3D Icon) ----- */
.menu-toggle{
  display:none;
  align-items:center;
  justify-content:center;
  width:38px;
  height:38px;
  padding:0;
  border-radius:10px;
  border:1px solid rgba(255,255,255,.1);
  background:rgba(255,255,255,.04);
  backdrop-filter:blur(8px);
  cursor:pointer;
  position:relative;
  transition:border-color .25s ease, background-color .25s ease, transform .2s ease;
}
.menu-toggle:hover{
  border-color:rgba(129,140,248,.45);
  background:rgba(129,140,248,.08);
  transform:scale(1.04);
}
.menu-toggle:active{
  transform:scale(0.96);
}
[data-theme="light"] .menu-toggle{
  border-color:rgba(0,0,0,.1);
  background:rgba(0,0,0,.03);
}
[data-theme="light"] .menu-toggle:hover{
  border-color:rgba(99,102,241,.4);
  background:rgba(99,102,241,.06);
}

.menu-canvas-wrap{
  width:26px;
  height:26px;
  display:flex;
  flex-direction:column;
  align-items:center;
  justify-content:center;
  gap:4px;
  pointer-events:none;
  position:relative;
}
.menu-canvas-wrap::before,
.menu-canvas-wrap::after{
  content:"";
  display:block;
  width:16px;
  height:2px;
  background:#a5b4fc;
  border-radius:2px;
  box-shadow:0 0 4px rgba(165,180,252,0.6);
}
.menu-canvas-wrap canvas{
  position:absolute;
  top:0;
  left:0;
  display:block;
  width:26px;
  height:26px;
}

/* Dropdown Menu Panel */
.site-menu-panel[hidden]{
  display:none !important;
}
.site-menu-panel{
  position:fixed;
  top:76px;
  right:var(--space-xl);
  width:280px;
  max-width:calc(100vw - 32px);
  background:rgba(8,8,16,.88);
  backdrop-filter:blur(24px) saturate(180%);
  -webkit-backdrop-filter:blur(24px) saturate(180%);
  border:1px solid rgba(255,255,255,.12);
  border-radius:16px;
  padding:12px;
  box-shadow:0 24px 60px rgba(0,0,0,.65), 0 0 0 1px rgba(255,255,255,.05);
  z-index:40;
  opacity:0;
  visibility:hidden;
  pointer-events:none;
  transform:translateY(-10px) scale(0.97);
  transform-origin:top right;
  transition:opacity .25s cubic-bezier(.2,.8,.2,1), transform .25s cubic-bezier(.2,.8,.2,1), visibility .25s ease;
}
.site-menu-panel.open{
  opacity:1;
  visibility:visible;
  pointer-events:auto;
  transform:translateY(0) scale(1);
}
[data-theme="light"] .site-menu-panel{
  background:rgba(255,255,255,.94);
  border-color:rgba(0,0,0,.08);
  box-shadow:0 20px 50px rgba(0,0,0,.15), 0 0 0 1px rgba(0,0,0,.04);
}

.site-menu-links{
  display:flex;
  flex-direction:column;
  gap:4px;
  list-style:none;
  padding:0;
  margin:0;
}
.site-menu-links a{
  display:flex;
  align-items:center;
  gap:10px;
  padding:10px 14px;
  border-radius:10px;
  color:var(--text);
  font-size:.84rem;
  font-weight:500;
  text-decoration:none;
  transition:background-color .2s ease, color .2s ease, transform .2s ease;
}
.site-menu-links a::before{
  content:"";
  width:6px;
  height:6px;
  border-radius:50%;
  background:var(--node-color, var(--indigo-2));
  box-shadow:0 0 8px var(--node-color, var(--indigo-2));
  flex-shrink:0;
}
.site-menu-links a:hover{
  background:rgba(129,140,248,.1);
  color:#fff;
  transform:translateX(3px);
}
[data-theme="light"] .site-menu-links a{
  color:var(--text);
}
[data-theme="light"] .site-menu-links a:hover{
  background:rgba(99,102,241,.08);
  color:var(--indigo);
}

@media(max-width:640px){
  .site-menu-panel{
    right:16px;
    left:16px;
    width:auto;
  }
}




/* === page-detail.css === */
/* ============================================
   AI Era — Page Detail Layout (shared across all sub-pages)
   Extracted from inline <style> blocks per design-system guide Mục 4
   ============================================ */

/* ----- Detail page body overrides ----- */
body.page-detail,
body:has(.page){
  cursor:auto;
  overflow:auto;
  min-height:100vh;
  padding:0;
  background:var(--bg);
  color:var(--text);
  transition:background-color .35s ease, color .35s ease;
}

/* ----- Page container ----- */
.page{
  max-width:760px;
  margin:0 auto;
  padding:104px 24px 60px;
}

/* ----- Page header (back-link + controls) ----- */
.page-header{
  display:flex;
  justify-content:space-between;
  align-items:center;
  margin-bottom:32px;
  gap:12px;
  flex-wrap:wrap;
}
.page-controls{
  display:flex;
  align-items:center;
  gap:8px;
}

/* ----- Page typography ----- */
.page h1{
  font-size:clamp(1.8rem,4vw,2.6rem);
  line-height:1.15;
  letter-spacing:-.04em;
  font-weight:800;
  margin-bottom:20px;
  background:linear-gradient(100deg,#fff 0%,#a5b4fc 50%,#67e8f9 100%);
  -webkit-background-clip:text;
  background-clip:text;
  color:transparent;
}
[data-theme="light"] .page h1{
  background:linear-gradient(100deg,#0f172a 0%,#4338ca 50%,#0284c7 100%);
  -webkit-background-clip:text;
  background-clip:text;
  color:transparent;
}
.page h2{
  font-size:1.2rem;
  font-weight:700;
  color:var(--indigo-2);
  margin:32px 0 12px;
  letter-spacing:-.02em;
}
[data-theme="light"] .page h2{
  color:#4f46e5;
}
.page h3{
  font-size:1rem;
  font-weight:600;
  color:var(--text);
  margin:20px 0 8px;
}
.page p,
.page li{
  font-size:.88rem;
  line-height:1.75;
  color:var(--muted);
}
[data-theme="light"] .page p,
[data-theme="light"] .page li{
  color:#334155;
}
.page ul{
  padding-left:20px;
  margin:8px 0;
}
.page em{
  color:#8a8a93;
  font-style:italic;
}
[data-theme="light"] .page em{
  color:#64748b;
}
.page a{
  color:var(--indigo-2);
  text-decoration:none;
}
.page a:hover{
  color:var(--cyan);
  text-decoration:underline;
}
[data-theme="light"] .page a{
  color:#4f46e5;
}
[data-theme="light"] .page a:hover{
  color:#0284c7;
}

/* ----- Back link ----- */
.back-link{
  display:inline-flex;
  align-items:center;
  gap:4px;
  color:var(--indigo-2);
  text-decoration:none;
  font-size:.78rem;
  font-weight:600;
  transition:color .2s ease;
}
.back-link::before{
  content:"← ";
}
[data-theme="light"] .back-link{
  color:#4f46e5;
}
.back-link:hover{
  color:var(--cyan);
}
[data-theme="light"] .back-link:hover{
  color:#0284c7;
}

/* ----- Blockquote (service pages) ----- */
.page blockquote{
  border-left:3px solid var(--indigo);
  padding:12px 16px;
  margin:24px 0;
  font-style:italic;
  color:var(--muted);
  background:var(--surface);
  border-radius:0 var(--radius-sm) var(--radius-sm) 0;
}
[data-theme="light"] .page blockquote{
  border-left-color:#4f46e5;
  background:#f8f9fc;
  color:#475569;
}

/* ----- Breadcrumb navigation ----- */
.breadcrumb{
  display:flex;
  align-items:center;
  gap:8px;
  font-size:.82rem;
  color:var(--muted);
  margin-bottom:20px;
}
.breadcrumb a{
  color:var(--indigo-2);
  text-decoration:none;
  transition:color .2s ease;
}
.breadcrumb a:hover{
  color:var(--cyan);
  text-decoration:underline;
}
.breadcrumb-sep{
  color:rgba(255,255,255,.3);
}
[data-theme="light"] .breadcrumb-sep{
  color:rgba(0,0,0,.3);
}
.breadcrumb span[aria-current="page"]{
  color:var(--text);
  font-weight:500;
}

/* ----- Related services section ----- */
.related-services{
  margin-top:48px;
  padding-top:32px;
  border-top:1px solid var(--border);
}
.related-services h2{
  font-size:1.15rem;
  margin-bottom:16px;
  color:var(--indigo-2);
}
.related-services ul{
  list-style:none;
  padding:0;
  margin:0;
  display:flex;
  flex-direction:column;
  gap:10px;
}
.related-services li{
  display:flex;
  align-items:center;
  gap:8px;
}
.related-services li::before{
  content:"→";
  color:var(--indigo-2);
  font-weight:bold;
}
.related-services a{
  color:var(--text);
  text-decoration:none;
  font-weight:500;
  transition:color .2s ease, transform .2s ease;
}
.related-services a:hover{
  color:var(--cyan);
  transform:translateX(4px);
}
[data-theme="light"] .related-services a{
  color:var(--text);
}
[data-theme="light"] .related-services a:hover{
  color:#0284c7;
}



/* === animations.css === */
/* ============================================
   AI Era — Animations / Keyframes
   ============================================ */

/* AI Era gradient shift — 9s cycle, 4-color gradient panning */
@keyframes aiEraGradientShift{
  0%   { background-position: 0% 50%; }
  50%  { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

/* Reduced motion override */
@media (prefers-reduced-motion: reduce){
  .core-label strong{ animation:none; }
}


/* === theme.css === */
/* ============================================
   AI Era — Theme (Day/Night — future expansion)
   ============================================ */

/* Currently dark-only; light theme tokens can be added here under
   @media (prefers-color-scheme: light) or a [data-theme="light"] selector. */


/* === responsive.css === */
/* ============================================
   AI Era — Responsive / Touch
   ============================================ */

@media(max-width:900px){
  nav{padding:17px 18px}
  .nav-center{display:none}
  .intro{left:18px;top:90px;max-width:280px}
  .intro p{display:none}
  .hud{display:none}
  .controls{left:18px;bottom:18px}
  .node-label{font-size:.61rem;padding:8px 9px}
  .node-label small{display:none}
  .focus-panel{right:14px;bottom:62px;width:calc(100vw - 28px)}
  .lang-btn{padding:5px 8px;font-size:.56rem}
  .lang-switch{gap:2px;padding:2px}
}

@media(max-width:767px){
  .hud{font-size:.6rem}
  .contact-cta-btn{
    padding:5px 15px 5px 7px;
    gap:9px;
  }
  .contact-cta-canvas-wrap, #contactBtnCanvas{
    width:42px;height:42px;min-width:42px;
  }
  .contact-cta-title{
    font-size:.82rem;
  }
  .focus-panel{
    width:100%;
    right:0;
    bottom:0;
    top:auto;
    border-radius:var(--radius-lg) var(--radius-lg) 0 0;
  }
}

/* Touch devices — hide custom cursor */
@media(pointer:coarse){
  body{cursor:auto}
  .contact-cta-btn, .focus-detail-link, .focus-back-btn, .focus-panel button{cursor:pointer}
  .cursor-dot,.cursor-outline{display:none}
}


/* === contact-footer.css === */
/* ============================================
   AI Era — Contact Footer
   Three.js particle network + glassmorphism
   ============================================ */

/* ----- Footer Container ----- */
.contact-footer{
  position:relative;
  z-index:25;
  width:100%;
  min-height:340px;
  overflow:hidden;
  border-top:1px solid var(--border);
  background:linear-gradient(180deg,rgba(3,3,5,.92) 0%,rgba(6,6,14,.98) 100%);
}

/* Three.js canvas sits behind content */
.contact-footer__canvas{
  position:absolute;inset:0;z-index:0;
  pointer-events:none;
}
.contact-footer__canvas canvas{
  display:block;width:100%;height:100%;
}

/* Gradient overlay to blend top edge */
.contact-footer__fade{
  position:absolute;top:0;left:0;right:0;height:80px;z-index:1;
  background:linear-gradient(180deg,var(--bg) 0%,transparent 100%);
  pointer-events:none;
}

/* ----- Content Layer ----- */
.contact-footer__content{
  position:relative;z-index:2;
  max-width:900px;
  margin:0 auto;
  padding:52px 42px 40px;
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:32px;
}

/* Close (X) button — top-right corner */
.contact-footer__close{
  position:absolute;
  top:18px;right:18px;
  z-index:10;
  width:42px;height:42px;
  display:grid;place-items:center;
  border:1px solid rgba(129,140,248,.25);
  border-radius:50%;
  background:rgba(8,8,16,.65);
  backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
  color:#a5b4fc;
  font-size:1.1rem;
  font-weight:300;
  font-family:var(--font-mono);
  cursor:pointer;
  text-decoration:none;
  transition:all .3s cubic-bezier(.2,.8,.2,1);
  box-shadow:0 0 0 0 rgba(129,140,248,0);
  animation:closeButtonPulse 3s ease-in-out infinite;
}
.contact-footer__close:hover{
  color:#fff;
  border-color:rgba(129,140,248,.55);
  background:rgba(129,140,248,.18);
  transform:scale(1.12) rotate(90deg);
  box-shadow:
    0 0 20px rgba(129,140,248,.25),
    0 0 40px rgba(129,140,248,.08);
}
.contact-footer__close:active{
  transform:scale(.95) rotate(90deg);
}
@keyframes closeButtonPulse{
  0%,100%{box-shadow:0 0 0 0 rgba(129,140,248,0)}
  50%{box-shadow:0 0 0 8px rgba(129,140,248,.1)}
}

/* Section header */
.contact-footer__kicker{
  display:inline-flex;align-items:center;gap:8px;
  padding:6px 14px;border-radius:var(--radius-pill);
  border:1px solid rgba(129,140,248,.28);
  background:rgba(129,140,248,.08);
  color:#a5b4fc;
  font:500 .68rem var(--font-mono);
  letter-spacing:.08em;
  text-transform:uppercase;
}
.contact-footer__kicker i{
  width:5px;height:5px;border-radius:50%;
  background:#a5b4fc;
  box-shadow:0 0 10px #818cf8;
  animation:contactPulse 2s ease-in-out infinite;
}
@keyframes contactPulse{
  0%,100%{opacity:.6;transform:scale(.85)}
  50%{opacity:1;transform:scale(1.2)}
}

.contact-footer__title{
  font-size:clamp(1.4rem,3vw,2rem);
  font-weight:700;
  letter-spacing:-.04em;
  text-align:center;
  background:linear-gradient(115deg,#fff 10%,#d8ddff 35%,#818cf8 60%,#67e8f9 85%);
  background-size:220% 220%;
  -webkit-background-clip:text;background-clip:text;color:transparent;
  animation:aiEraGradientShift 6s ease-in-out infinite;
}

/* ----- Icon Grid ----- */
.contact-footer__grid{
  display:flex;
  flex-wrap:wrap;
  justify-content:center;
  gap:16px;
}

/* Each contact item — glassmorphism card */
.contact-item{
  display:flex;align-items:center;gap:12px;
  padding:14px 20px;
  border-radius:14px;
  border:1px solid rgba(255,255,255,.07);
  background:rgba(8,8,16,.55);
  backdrop-filter:blur(16px);
  -webkit-backdrop-filter:blur(16px);
  text-decoration:none;
  color:#dcdce2;
  font-size:.82rem;
  font-weight:500;
  cursor:pointer;
  transition:all .32s cubic-bezier(.2,.8,.2,1);
  position:relative;
  overflow:hidden;
}

/* Glow border on hover */
.contact-item::before{
  content:"";
  position:absolute;inset:-1px;
  border-radius:inherit;
  background:linear-gradient(135deg,var(--item-glow,rgba(129,140,248,.35)),transparent 60%);
  opacity:0;
  transition:opacity .35s;
  z-index:-1;
}
.contact-item:hover::before{opacity:1}

.contact-item:hover{
  color:#fff;
  border-color:color-mix(in srgb,var(--item-glow,#818cf8) 45%,transparent);
  background:rgba(14,14,23,.78);
  transform:translateY(-3px) scale(1.03);
  box-shadow:
    0 8px 32px rgba(0,0,0,.28),
    0 0 20px color-mix(in srgb,var(--item-glow,#818cf8) 18%,transparent);
}

/* Icon container */
.contact-item__icon{
  width:36px;height:36px;
  display:grid;place-items:center;
  border-radius:10px;
  background:rgba(255,255,255,.04);
  border:1px solid rgba(255,255,255,.06);
  flex-shrink:0;
  transition:all .32s;
}
.contact-item:hover .contact-item__icon{
  background:rgba(129,140,248,.1);
  border-color:rgba(129,140,248,.22);
  box-shadow:0 0 14px color-mix(in srgb,var(--item-glow,#818cf8) 25%,transparent);
}

.contact-item__icon svg{
  width:20px;height:20px;
  fill:currentColor;
  transition:color .3s,filter .3s;
}
.contact-item:hover .contact-item__icon svg{
  filter:drop-shadow(0 0 6px color-mix(in srgb,var(--item-glow,#818cf8) 55%,transparent));
}

/* Text stack */
.contact-item__text{
  display:flex;flex-direction:column;gap:2px;
}
.contact-item__label{
  font:500 .58rem var(--font-mono);
  color:#555562;letter-spacing:.1em;
  text-transform:uppercase;
}
.contact-item__value{
  color:inherit;font-size:.82rem;font-weight:600;
}

/* Color variants */
.contact-item--zalo{--item-glow:#3b82f6}
.contact-item--zalo .contact-item__icon svg{color:#3b82f6}
.contact-item--telegram{--item-glow:#38bdf8}
.contact-item--telegram .contact-item__icon svg{color:#38bdf8}
.contact-item--whatsapp{--item-glow:#22c55e}
.contact-item--whatsapp .contact-item__icon svg{color:#22c55e}
.contact-item--messenger{--item-glow:#a855f7}
.contact-item--messenger .contact-item__icon svg{color:#a855f7}
.contact-item--linkedin{--item-glow:#0a66c2}
.contact-item--linkedin .contact-item__icon svg{color:#0a66c2}
.contact-item--phone{--item-glow:#a5b4fc}
.contact-item--phone .contact-item__icon svg{color:#a5b4fc}
.contact-item--email{--item-glow:#67e8f9}
.contact-item--email .contact-item__icon svg{color:#67e8f9}

/* ----- Footer Services Line (link tĩnh, tối giản cho SEO) ----- */
.contact-footer__services{display:flex;flex-wrap:wrap;align-items:center;justify-content:center;gap:5px 10px;padding-top:18px;width:100%;font:400 .62rem var(--font-mono);letter-spacing:.04em}
.contact-footer__services-label{color:#444450}
.contact-footer__services a{color:#5a5a68;text-decoration:none;transition:color .2s ease}
.contact-footer__services a:hover{color:var(--indigo-2)}

/* ----- Footer Bottom ----- */
.contact-footer__bottom{
  display:flex;align-items:center;gap:12px;
  padding-top:20px;
  border-top:1px solid rgba(255,255,255,.05);
  width:100%;
  justify-content:center;
}
.contact-footer__copyright{
  font:400 .62rem var(--font-mono);
  color:#444450;
  letter-spacing:.06em;
}
.contact-footer__dot{
  width:3px;height:3px;border-radius:50%;
  background:rgba(129,140,248,.35);
}
.spatial-hero{
  height:100vh;
  width:100%;
  pointer-events:none;
}
.contact-footer__back-top{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:4px 10px;
  border-radius:var(--radius-pill);
  border:1px solid rgba(129,140,248,.25);
  background:rgba(129,140,248,.07);
  color:var(--indigo-2);
  font:500 .62rem var(--font-mono);
  letter-spacing:.06em;
  text-decoration:none;
  transition:all .25s;
}
.contact-footer__back-top:hover{
  background:rgba(129,140,248,.18);
  border-color:rgba(129,140,248,.45);
  color:#fff;
  transform:translateY(-1px);
}

/* ----- Responsive ----- */
@media(max-width:900px){
  .contact-footer__content{padding:40px 18px 32px}
  .contact-footer__close{top:12px;right:12px;width:36px;height:36px;font-size:.95rem}
  .contact-footer__grid{gap:10px}
  .contact-item{padding:11px 14px;font-size:.76rem;gap:10px}
  .contact-item__icon{width:32px;height:32px}
  .contact-item__icon svg{width:17px;height:17px}
  .contact-item__label{font-size:.52rem}
  .contact-item__value{font-size:.76rem}
}

@media(max-width:480px){
  .contact-footer__grid{flex-direction:column;align-items:stretch}
  .contact-item{justify-content:flex-start}
  .contact-footer__title{font-size:1.2rem}
  .contact-footer{min-height:auto}
  .contact-footer__close{top:8px;right:8px;width:34px;height:34px}
}

/* Cursor override for footer on desktop */
@media(pointer:fine){
  .contact-item{cursor:none}
  .contact-footer__close{cursor:none}
}
@media(pointer:coarse){
  .contact-item{cursor:pointer}
  .contact-footer__close{cursor:pointer}
}

/* ----- Light Theme Overrides for Contact Footer (per light-mode-guide.md) ----- */
[data-theme="light"] .contact-footer{
  background: var(--bg);
  border-top-color: var(--border);
}
[data-theme="light"] .contact-footer__fade{
  background: linear-gradient(180deg, var(--bg) 0%, transparent 100%);
}
[data-theme="light"] .contact-footer__title{
  font-weight: 700;
  letter-spacing: -0.025em;
  color: var(--text);
  background: var(--gradient-text);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
[data-theme="light"] .contact-footer__kicker{
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--accent);
}
[data-theme="light"] .contact-footer__kicker i{
  background: var(--accent);
  box-shadow: 0 0 8px rgba(61, 79, 224, 0.4);
}
[data-theme="light"] .contact-footer__close{
  background: var(--surface);
  border-color: var(--border);
  color: var(--text-muted);
}
[data-theme="light"] .contact-footer__close:hover{
  background: var(--accent);
  color: #ffffff;
  border-color: var(--accent);
}
[data-theme="light"] .contact-item{
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 10px;
  box-shadow: 0 8px 24px rgba(20, 20, 50, 0.06);
}
[data-theme="light"] .contact-item:hover{
  background: var(--surface);
  color: var(--text);
  border-color: var(--accent);
  box-shadow: 0 10px 28px rgba(61, 79, 224, 0.15);
}
[data-theme="light"] .contact-item__label{
  color: var(--text-muted);
}
[data-theme="light"] .contact-item__icon{
  background: #FAFBFD;
  border-color: var(--border);
  color: var(--accent);
}
[data-theme="light"] .contact-footer__bottom{
  border-top-color: var(--border);
}
[data-theme="light"] .contact-footer__copyright{
  color: var(--text-muted);
}
[data-theme="light"] .contact-footer__back-top{
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--accent);
}
[data-theme="light"] .contact-footer__back-top:hover{
  background: var(--accent);
  border-color: var(--accent);
  color: #ffffff;
}