/* ============================================================
   AIT ALLIANCE — Design System
   AI Transformation Alliance · Modern Tech UI
   ============================================================ */

/* ---------- Design Tokens ---------- */
:root {
  /* Brand palette */
  --bg:           #070b18;
  --bg-2:         #0b1124;
  --surface:      #0f1730;
  --surface-2:    #141d3b;
  --line:         rgba(255,255,255,.08);
  --line-strong:  rgba(255,255,255,.14);

  --ink:          #eef2ff;
  --ink-soft:     #c2cae6;
  --ink-muted:    #8b95bd;

  --brand:        #4f7cff;   /* electric blue */
  --brand-2:      #00d2c6;   /* cyan/teal */
  --brand-3:      #9b6bff;   /* violet */
  --accent:       #ffb020;   /* gold accent */

  /* Sector colors */
  --sector-re:    #4f7cff;   /* Bất động sản */
  --sector-health:#00d2c6;   /* Y tế */
  --sector-edu:   #9b6bff;   /* Giáo dục */

  --grad-brand: linear-gradient(120deg, #4f7cff 0%, #00d2c6 60%, #9b6bff 100%);
  --grad-soft:  linear-gradient(135deg, rgba(79,124,255,.16), rgba(0,210,198,.10));

  --radius:   18px;
  --radius-sm:12px;
  --radius-lg:28px;
  --shadow:   0 24px 60px -22px rgba(0,0,0,.7);
  --shadow-sm:0 10px 30px -16px rgba(0,0,0,.6);

  --ff-sans: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --ff-display: "Space Grotesk", var(--ff-sans);

  --maxw: 1200px;
  --gut: clamp(20px, 5vw, 56px);
  --nav-h: 74px;
}

/* ---------- Reset ---------- */
*,*::before,*::after { box-sizing: border-box; }
* { margin: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--ff-sans);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.65;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
img,svg { display:block; max-width:100%; }
[hidden] { display: none !important; }   /* author .grid{display:grid} would otherwise beat the UA [hidden] rule */
a { color: inherit; text-decoration: none; }
ul { list-style: none; padding: 0; }
button { font: inherit; cursor: pointer; border: none; background: none; color: inherit; }
h1,h2,h3,h4 { font-family: var(--ff-display); font-weight: 600; line-height: 1.12; letter-spacing: -.02em; text-wrap: balance; }

/* ---------- Background ambience ---------- */
body::before {
  content:""; position: fixed; inset:0; z-index:-2;
  background:
    radial-gradient(900px 520px at 12% -8%, rgba(79,124,255,.22), transparent 60%),
    radial-gradient(760px 520px at 92% 4%, rgba(155,107,255,.18), transparent 60%),
    radial-gradient(700px 600px at 60% 110%, rgba(0,210,198,.12), transparent 60%),
    var(--bg);
}
body::after {
  content:""; position: fixed; inset:0; z-index:-1; opacity:.5;
  background-image:
    linear-gradient(rgba(255,255,255,.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.03) 1px, transparent 1px);
  background-size: 64px 64px;
  -webkit-mask-image: radial-gradient(circle at 50% 30%, #000 0%, transparent 75%);
          mask-image: radial-gradient(circle at 50% 30%, #000 0%, transparent 75%);
}

/* ---------- Layout helpers ---------- */
.wrap { width: 100%; max-width: var(--maxw); margin-inline: auto; padding-inline: var(--gut); }
.section { padding-block: clamp(64px, 9vw, 120px); position: relative; }
.section--tight { padding-block: clamp(48px, 6vw, 80px); }
.grid { display: grid; gap: clamp(18px, 2.4vw, 30px); }
.center { text-align: center; }
.muted { color: var(--ink-muted); }
.soft { color: var(--ink-soft); }

.eyebrow {
  display:inline-flex; align-items:center; gap:9px;
  font-family: var(--ff-display);
  font-size: .76rem; font-weight: 600; letter-spacing: .18em; text-transform: uppercase;
  color: var(--brand-2);
  padding: 7px 14px; border-radius: 999px;
  background: rgba(0,210,198,.08);
  border: 1px solid rgba(0,210,198,.22);
}
.eyebrow::before { content:""; width:7px; height:7px; border-radius:50%; background: var(--brand-2); box-shadow:0 0 12px var(--brand-2); }

.h-xl { font-size: clamp(2.4rem, 6vw, 4.3rem); }
.h-lg { font-size: clamp(2rem, 4.4vw, 3.1rem); }
.h-md { font-size: clamp(1.5rem, 3vw, 2.1rem); }
.lead { font-size: clamp(1.05rem, 1.7vw, 1.28rem); color: var(--ink-soft); max-width: 62ch; }

.gradient-text {
  background: var(--grad-brand);
  -webkit-background-clip: text; background-clip: text; color: transparent;
  white-space: nowrap;   /* highlighted phrase always stays on one line */
}
.section-head { max-width: 980px; margin-bottom: clamp(34px, 5vw, 60px); }
.section-head h2 { text-wrap: balance; }
.section-head p { max-width: 64ch; }
.section-head.center { margin-inline:auto; }
.section-head.center p { margin-inline:auto; }
.section-head .eyebrow { margin-bottom: 18px; }
.section-head p { margin-top: 16px; }

/* ---------- Buttons ---------- */
.btn {
  display:inline-flex; align-items:center; gap:10px;
  padding: 14px 26px; border-radius: 999px;
  font-family: var(--ff-display); font-weight: 600; font-size: .98rem;
  transition: transform .25s, box-shadow .25s, background .25s, border-color .25s;
  white-space: nowrap;
}
.btn svg { width: 18px; height: 18px; }
.btn--primary { background: var(--grad-brand); color: #061025; box-shadow: 0 14px 34px -12px rgba(79,124,255,.7); }
.btn--primary:hover { transform: translateY(-3px); box-shadow: 0 22px 44px -12px rgba(79,124,255,.8); }
.btn--ghost { border: 1px solid var(--line-strong); color: var(--ink); background: rgba(255,255,255,.02); }
.btn--ghost:hover { border-color: var(--brand-2); background: rgba(0,210,198,.08); transform: translateY(-3px); }
.btn--sm { padding: 11px 20px; font-size: .9rem; }
.btn-row { display:flex; flex-wrap:wrap; gap:14px; }

.arrow-link { display:inline-flex; align-items:center; gap:8px; font-family:var(--ff-display); font-weight:600; color: var(--brand-2); transition:gap .25s; }
.arrow-link:hover { gap: 14px; }
.arrow-link svg { width:16px; height:16px; }

/* ---------- Cards ---------- */
.card {
  background: linear-gradient(180deg, var(--surface), var(--bg-2));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: clamp(22px, 2.6vw, 32px);
  position: relative;
  transition: transform .3s, border-color .3s, box-shadow .3s;
  overflow: hidden;
}
.card::after {
  content:""; position:absolute; inset:0; border-radius:inherit; padding:1px;
  background: var(--grad-brand);
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor; mask-composite: exclude;
  opacity:0; transition: opacity .3s;
}
.card:hover { transform: translateY(-6px); box-shadow: var(--shadow); }
.card:hover::after { opacity:.6; }
.card .ic {
  width: 52px; height: 52px; border-radius: 14px; display:grid; place-items:center;
  background: var(--grad-soft); border:1px solid var(--line-strong); margin-bottom: 18px;
  font-size: 1.5rem;
}
.card h3 { font-size: 1.2rem; margin-bottom: 10px; }
.card p { color: var(--ink-muted); font-size: .96rem; }
.card .tag { position:absolute; top:18px; right:18px; font-size:.66rem; font-weight:700; letter-spacing:.1em; text-transform:uppercase; padding:5px 10px; border-radius:999px; background:rgba(255,176,32,.12); color:var(--accent); border:1px solid rgba(255,176,32,.3); }

.cols-2 { grid-template-columns: repeat(2, 1fr); }
.cols-3 { grid-template-columns: repeat(3, 1fr); }
.cols-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 940px){ .cols-3,.cols-4{ grid-template-columns: repeat(2,1fr);} }
@media (max-width: 620px){ .cols-2,.cols-3,.cols-4{ grid-template-columns: 1fr;} }

/* ---------- Navbar ---------- */
.nav {
  position: sticky; top: 0; z-index: 100;
  height: var(--nav-h);
  display:flex; align-items:center;
  backdrop-filter: blur(16px);
  background: rgba(7,11,24,.72);
  border-bottom: 1px solid transparent;
  transition: background .3s, border-color .3s;
}
.nav.scrolled { background: rgba(7,11,24,.92); border-bottom-color: var(--line); }
.nav .wrap { display:flex; align-items:center; gap: 14px; max-width: 1460px; padding-inline: 26px; }
.brand { flex:none; display:flex; align-items:center; gap: 10px; font-family: var(--ff-display); font-weight:700; font-size:1.02rem; letter-spacing:-.01em; }
.brand .logo {
  width: 40px; height: 40px; border-radius: 11px; display:grid; place-items:center;
  background: var(--grad-brand); color:#061025; font-weight:800; font-size:1rem;
  box-shadow: 0 8px 22px -8px rgba(79,124,255,.8);
}
.brand small { display:block; font-family:var(--ff-sans); font-weight:500; font-size:.62rem; letter-spacing:.16em; text-transform:uppercase; color:var(--ink-muted); }

/* nav-menu is the flex row holding links (left) + CTA (pushed fully right) */
.nav-menu { flex:1; display:flex; align-items:center; gap: 12px; min-width:0; }
.nav-links { display:flex; align-items:center; gap: 0; flex-wrap:nowrap; }
.nav-links > li > a {
  display:inline-flex; align-items:center; gap:4px;
  padding: 8px 8px; border-radius: 9px; font-size: .82rem; font-weight:500;
  color: var(--ink-soft); white-space:nowrap; transition: color .2s, background .2s;
}
.nav-links > li > a:hover, .nav-links > li.active > a { color: var(--ink); background: rgba(255,255,255,.05); }
.nav-links > li > a .cv { font-size:.62rem; opacity:.65; transition: transform .25s; }
.has-menu:hover > a .cv { transform: rotate(180deg); }

/* Dropdown (cấp 2) */
.has-menu { position: relative; }
.submenu {
  position:absolute; top: calc(100% + 10px); left: 0;
  min-width: 312px; padding: 10px;
  background: var(--surface); border:1px solid var(--line-strong); border-radius: 16px;
  box-shadow: var(--shadow);
  opacity:0; visibility:hidden; transform: translateY(8px);
  transition: opacity .2s, transform .2s, visibility .2s;
}
.has-menu:hover > .submenu { opacity:1; visibility:visible; transform: none; }
.submenu li { position: relative; }
.submenu > li > a, .subsub a {
  display:flex; align-items:center; justify-content:space-between; gap:14px;
  padding:10px 12px; border-radius: 10px; font-size:.875rem; color: var(--ink-soft);
  transition: background .2s, color .2s;
}
.submenu > li > a:hover, .subsub a:hover { background: rgba(79,124,255,.12); color: var(--ink); }
.submenu .ov { color: var(--brand-2); font-weight:600; font-family:var(--ff-display); }
.submenu .cv2 { font-size:.72rem; color: var(--brand-2); flex:none; }
.has-sub:hover > a { background: rgba(79,124,255,.12); color: var(--ink); }

/* Nested (cấp 3) */
.subsub {
  position:absolute; left: calc(100% + 8px); top: -10px;
  min-width: 300px; padding: 10px;
  background: var(--surface); border:1px solid var(--line-strong); border-radius:16px;
  box-shadow: var(--shadow);
  opacity:0; visibility:hidden; transform: translateX(-6px);
  transition: opacity .2s, transform .2s, visibility .2s;
}
.has-sub:hover > .subsub { opacity:1; visibility:visible; transform:none; }
.subsub .sub-head { font-size:.66rem; letter-spacing:.12em; text-transform:uppercase; color:var(--ink-muted); padding:6px 12px 8px; }

/* right-align dropdowns for the last items so they don't overflow the viewport */
.nav-links > li:nth-last-child(-n+3) > .submenu { left:auto; right:0; }

.nav-cta { margin-left:auto; flex:none; display:flex; align-items:center; gap: 12px; }
.lang-toggle { display:flex; gap:2px; padding:3px; border-radius:999px; border:1px solid var(--line); background:rgba(255,255,255,.03); }
.lang-toggle button { padding:5px 11px; border-radius:999px; font-size:.78rem; font-weight:600; color:var(--ink-muted); transition: all .2s;}
.lang-toggle button.on { background: var(--grad-brand); color:#061025; }

.nav-toggle { display:none; width:44px; height:44px; border-radius:11px; border:1px solid var(--line-strong); place-items:center; flex:none; }
.nav-toggle span, .nav-toggle span::before, .nav-toggle span::after { content:""; display:block; width:20px; height:2px; background:var(--ink); border-radius:2px; transition: transform .3s, opacity .3s; position:relative; }
.nav-toggle span::before { position:absolute; top:-6px; } .nav-toggle span::after { position:absolute; top:6px; }
.nav-toggle.open span { background: transparent; }
.nav-toggle.open span::before { transform: translateY(6px) rotate(45deg); }
.nav-toggle.open span::after { transform: translateY(-6px) rotate(-45deg); }

@media (max-width: 1440px){
  .nav-toggle { display:grid; }
  .nav-menu {
    position: fixed; inset: var(--nav-h) 0 auto 0;
    background: var(--bg-2); border-bottom:1px solid var(--line);
    padding: 16px var(--gut) 28px; flex-direction: column; align-items: stretch; gap: 2px;
    max-height: calc(100vh - var(--nav-h)); overflow-y:auto;
    transform: translateY(-12px); opacity:0; visibility:hidden; transition: all .28s;
  }
  .nav-menu.open { transform: translateY(0); opacity:1; visibility:visible; }
  .nav-links { flex-direction: column; align-items: stretch; gap:2px; }
  .nav-links > li > a { padding: 13px; font-size:1rem; justify-content:space-between; }
  .has-menu > a .cv { transition: transform .25s; }
  .has-menu.open-sub > a .cv { transform: rotate(180deg); }
  /* cấp 2 + cấp 3 inline-expand on mobile */
  .submenu { position:static; opacity:1; visibility:visible; transform:none; box-shadow:none;
    min-width:0; background:rgba(255,255,255,.025); border:1px solid var(--line);
    margin:2px 0 8px 10px; padding:6px; display:none; }
  .has-menu.open-sub > .submenu { display:block; }
  .nav-links > li:nth-last-child(-n+3) > .submenu { right:auto; }
  .subsub { position:static; opacity:1; visibility:visible; transform:none; box-shadow:none;
    min-width:0; background:transparent; border:none; border-left:2px solid var(--line);
    margin:2px 0 4px 12px; padding:2px 0 2px 8px; border-radius:0; display:none; }
  .has-sub.open-sub > .subsub { display:block; }
  .nav-cta { margin:14px 0 0; flex-direction: column; align-items: stretch; }
  .nav-cta .btn { justify-content:center; }
}

/* ---------- Hero ---------- */
.hero { position: relative; padding-block: clamp(64px, 11vw, 130px) clamp(50px, 8vw, 96px); overflow:hidden; }
.hero-grid { display:grid; grid-template-columns: 1.05fr .95fr; gap: clamp(36px, 5vw, 70px); align-items: center; }
@media (max-width: 960px){ .hero-grid { grid-template-columns: 1fr; } }
.hero h1 { font-size: clamp(2.6rem, 6.4vw, 4.6rem); margin: 22px 0; }
.hero .lead { margin-bottom: 32px; }
.hero-stats { display:flex; flex-wrap:wrap; gap: clamp(20px,4vw,46px); margin-top: 44px; padding-top: 30px; border-top: 1px solid var(--line); }
.hero-stats .num { font-family: var(--ff-display); font-weight:700; font-size: clamp(1.7rem,3vw,2.3rem); }
.hero-stats .lbl { font-size:.82rem; color: var(--ink-muted); }

/* Hero visual — animated, clickable orbiting service satellites */
.hero-visual { position: relative; display:grid; place-items:center; min-height: 460px; }
.orbit {
  position:relative; width: min(440px, 94vw); aspect-ratio:1;
  display:grid; place-items:center;
}
/* decorative rings */
.orbit-ring { position:absolute; inset:0; border-radius:50%; border:1px solid var(--line-strong); }
.orbit-ring.r2 { inset:18%; border-style:dashed; border-color:rgba(255,255,255,.1); animation: spin 30s linear infinite; }
.orbit-ring.r3 { inset:34%; border-color:rgba(0,210,198,.22); animation: spin 22s linear infinite reverse; }

.orbit-core {
  position:relative; z-index:2;
  width: 34%; aspect-ratio:1; border-radius:50%;
  background: var(--grad-brand); box-shadow: 0 0 80px -10px rgba(79,124,255,.7);
  display:grid; place-items:center; font-family:var(--ff-display); font-weight:800; color:#06122b; font-size:1.4rem;
  animation: pulse 4s ease-in-out infinite;
}

/* JS-driven orbit: satellites revolve (positions set by site.js).
   On hover of any satellite, the whole orbit pauses + the hovered one is highlighted. */
.orbit-system { position:absolute; inset:0; z-index:3; }
.sat {
  position:absolute; top:50%; left:50%;            /* JS overrides left/top each frame */
  transform: translate(-50%,-50%);
  pointer-events:auto; cursor:pointer;
  transition: opacity .3s;
}
/* static fallback cross if JS doesn't run */
.sat:nth-child(1){ top:7%; }
.sat:nth-child(2){ left:93%; }
.sat:nth-child(3){ top:93%; }
.sat:nth-child(4){ left:7%; }

.chip-in {
  display:flex; align-items:center; gap:7px; white-space:nowrap;
  padding:11px 16px; border-radius:999px; font-size:.84rem; font-weight:600; color:var(--ink);
  background: var(--surface); border:1px solid var(--line-strong); box-shadow: var(--shadow-sm);
  backdrop-filter: blur(6px);
  transition: transform .25s, border-color .25s, box-shadow .25s, background .25s;
}
.chip-in i { font-style:normal; font-size:1rem; }

/* hovered satellite: scale + glow */
.orbit-system.paused .sat.active .chip-in,
.sat:hover .chip-in {
  transform: scale(1.2);
  border-color: var(--brand-2);
  background: var(--surface-2);
  box-shadow: 0 16px 40px -12px rgba(0,210,198,.6);
}
/* dim the non-hovered satellites while one is hovered */
.orbit-system.paused .sat:not(.active) { opacity:.4; }

@keyframes spin { to { transform: rotate(360deg); } }
@keyframes pulse { 0%,100%{ transform:scale(1);} 50%{ transform:scale(1.06);} }
@media (max-width:960px){ .hero-visual{ min-height: 380px; } }

/* ---------- Pillars / sectors strips ---------- */
.pillar { border-radius: var(--radius); padding: clamp(24px,3vw,34px); position:relative; overflow:hidden; }
.pillar .no { font-family:var(--ff-display); font-weight:700; font-size:.8rem; letter-spacing:.2em; color: var(--brand-2); }
.pillar h3 { font-size:1.35rem; margin:12px 0 12px; }
.pillar ul li { display:flex; gap:9px; align-items:flex-start; font-size:.92rem; color:var(--ink-soft); padding:5px 0; }
.pillar ul li::before { content:""; flex:none; width:7px; height:7px; margin-top:8px; border-radius:50%; background: var(--grad-brand); }

.sector-card { padding: clamp(24px,3vw,32px); border-radius: var(--radius); border:1px solid var(--line); background: var(--surface); position:relative; overflow:hidden; transition: transform .3s, box-shadow .3s; }
.sector-card:hover { transform: translateY(-6px); box-shadow: var(--shadow); }
.sector-card .bar { position:absolute; inset:0 auto 0 0; width:5px; }
.sector-card .ic { font-size:2rem; margin-bottom:14px; }
.sector-card h3 { font-size:1.3rem; margin-bottom:10px; }
.sector-card p { color:var(--ink-muted); font-size:.94rem; }
.sector-card .pts { margin-top:16px; display:grid; gap:8px; }
.sector-card .pts li { font-size:.86rem; color:var(--ink-soft); display:flex; gap:8px; }
.sector-card .pts li::before { content:"→"; color:var(--brand-2); }

/* ---------- Stats band ---------- */
.statband { display:grid; grid-template-columns: repeat(4,1fr); gap: 1px; background: var(--line); border:1px solid var(--line); border-radius: var(--radius); overflow:hidden; }
.statband > div { background: var(--bg-2); padding: clamp(24px,3vw,36px); text-align:center; }
.statband .num { font-family:var(--ff-display); font-weight:700; font-size: clamp(1.9rem,3.4vw,2.7rem); }
.statband .lbl { color: var(--ink-muted); font-size:.86rem; margin-top:6px; }
@media (max-width:820px){ .statband { grid-template-columns: repeat(2,1fr);} }

/* ---------- Process / timeline ---------- */
.steps { display:grid; gap: 18px; }
.step { display:grid; grid-template-columns: 64px 1fr; gap: 20px; align-items:start; }
.step .n { width:56px; height:56px; border-radius:16px; display:grid; place-items:center; font-family:var(--ff-display); font-weight:700; font-size:1.3rem; background: var(--grad-soft); border:1px solid var(--line-strong); color:var(--brand-2); }
.step h4 { font-size:1.12rem; margin-bottom:6px; }
.step p { color: var(--ink-muted); font-size:.94rem; }

/* ---------- Team ---------- */
.team-card { text-align:center; }
.team-card .avatar {
  width: 88px; height:88px; margin: 0 auto 16px; border-radius: 50%;
  display:grid; place-items:center; font-family:var(--ff-display); font-weight:700; font-size:1.7rem;
  color:#06122b; background: var(--grad-brand);
  border: 3px solid var(--surface); box-shadow: 0 0 0 1px var(--line-strong);
}
.team-card h3 { font-size:1.12rem; }
.team-card .role { color: var(--brand-2); font-size:.86rem; font-weight:600; font-family:var(--ff-display); margin: 4px 0 10px; }
.team-card p { font-size:.86rem; color: var(--ink-muted); }
.team-card .layer { display:inline-block; margin-top:12px; font-size:.68rem; letter-spacing:.1em; text-transform:uppercase; color:var(--ink-muted); padding:4px 10px; border-radius:999px; border:1px solid var(--line); }

/* ---------- Page hero (inner pages) ---------- */
.page-hero { padding-block: clamp(56px, 8vw, 96px) clamp(34px,5vw,54px); position:relative; }
.page-hero .eyebrow { margin-bottom: 18px; }
.page-hero h1 { font-size: clamp(2.2rem, 5vw, 3.6rem); margin-bottom: 18px; }
.breadcrumb { display:flex; gap:8px; align-items:center; font-size:.82rem; color: var(--ink-muted); margin-bottom: 22px; }
.breadcrumb a:hover { color: var(--brand-2); }
.breadcrumb span { opacity:.5; }

/* ---------- Feature list / checklist ---------- */
.checklist { display:grid; gap: 12px; }
.checklist li { display:flex; gap:12px; align-items:flex-start; }
.checklist li .ck { flex:none; width:24px; height:24px; border-radius:7px; display:grid; place-items:center; background:rgba(0,210,198,.12); border:1px solid rgba(0,210,198,.3); color:var(--brand-2); font-size:.8rem; margin-top:2px; }
.checklist li p { color: var(--ink-soft); font-size:.96rem; }
.checklist li strong { color: var(--ink); }

/* ---------- Split feature ---------- */
.split { display:grid; grid-template-columns: 1fr 1fr; gap: clamp(34px,5vw,64px); align-items:center; }
.split.flip > :first-child { order: 2; }
@media (max-width: 880px){ .split { grid-template-columns: 1fr; } .split.flip > :first-child { order: 0; } }

.panel { background: var(--surface); border:1px solid var(--line); border-radius: var(--radius-lg); padding: clamp(24px,3vw,38px); box-shadow: var(--shadow-sm); }
.code-card { font-family: "JetBrains Mono", ui-monospace, monospace; font-size:.82rem; background: #0a1124; border:1px solid var(--line-strong); border-radius: var(--radius); overflow:hidden; }
.code-card .bar { display:flex; gap:7px; padding:13px 16px; border-bottom:1px solid var(--line); }
.code-card .bar i { width:11px; height:11px; border-radius:50%; background:#33405f; }
.code-card .bar i:nth-child(1){ background:#ff5f57; } .code-card .bar i:nth-child(2){ background:#febc2e; } .code-card .bar i:nth-child(3){ background:#28c840; }
.code-card pre { padding:18px; overflow-x:auto; color:#c9d4f5; line-height:1.7; margin:0; }
.code-card .k { color:#9b6bff; } .code-card .s { color:#00d2c6; } .code-card .c { color:#5b6789; } .code-card .f { color:#4f7cff; }

/* ---------- Accordion (FAQ) ---------- */
.accordion { display:grid; gap: 12px; }
.acc-item { border:1px solid var(--line); border-radius: var(--radius-sm); background: var(--surface); overflow:hidden; }
.acc-q { width:100%; text-align:left; display:flex; justify-content:space-between; align-items:center; gap:16px; padding: 18px 22px; font-family:var(--ff-display); font-weight:600; font-size:1.02rem; }
.acc-q .ic { flex:none; transition: transform .3s; color: var(--brand-2); }
.acc-item.open .acc-q .ic { transform: rotate(45deg); }
.acc-a { max-height:0; overflow:hidden; transition: max-height .35s ease; }
.acc-a p { padding: 0 22px 20px; color: var(--ink-muted); font-size:.95rem; }

/* ---------- Forms ---------- */
.form { display:grid; gap: 18px; }
.field { display:grid; gap:7px; }
.field label { font-size:.86rem; font-weight:600; color: var(--ink-soft); }
.field label .req { color: var(--accent); }
.field input, .field select, .field textarea {
  width:100%; padding: 13px 15px; border-radius: var(--radius-sm);
  background: var(--bg-2); border:1px solid var(--line-strong); color: var(--ink); font: inherit;
  transition: border-color .2s, box-shadow .2s;
}
.field input:focus, .field select:focus, .field textarea:focus { outline:none; border-color: var(--brand); box-shadow: 0 0 0 3px rgba(79,124,255,.18); }
.field textarea { resize: vertical; min-height: 120px; }
.field-row { display:grid; grid-template-columns:1fr 1fr; gap:18px; }
@media (max-width:560px){ .field-row { grid-template-columns:1fr; } }
.form-note { font-size:.82rem; color: var(--ink-muted); }
.form-success { display:none; padding:16px 18px; border-radius:var(--radius-sm); background:rgba(0,210,198,.1); border:1px solid rgba(0,210,198,.35); color:var(--brand-2); font-size:.92rem; }
.form-success.show { display:block; }

/* ---------- CTA band ---------- */
.cta-band { position:relative; border-radius: var(--radius-lg); padding: clamp(36px,5vw,64px); overflow:hidden; text-align:center;
  background: linear-gradient(120deg, rgba(79,124,255,.16), rgba(155,107,255,.14)); border:1px solid var(--line-strong); }
.cta-band::before { content:""; position:absolute; inset:0; background: radial-gradient(600px 300px at 50% -20%, rgba(0,210,198,.25), transparent 70%); }
.cta-band > * { position:relative; }
.cta-band h2 { margin-bottom: 16px; }
.cta-band .btn-row { justify-content:center; margin-top: 28px; }

/* ---------- Logo strip ---------- */
.logo-strip { display:flex; flex-wrap:wrap; gap: clamp(20px,4vw,56px); align-items:center; justify-content:center; opacity:.8; }
.logo-strip span { font-family:var(--ff-display); font-weight:700; font-size:1.05rem; color:var(--ink-muted); letter-spacing:.02em; }

/* ---------- Article / blog cards ---------- */
.post { display:flex; flex-direction:column; overflow:hidden; padding:0; }
.post .thumb { aspect-ratio: 16/9; background: var(--grad-soft); display:grid; place-items:center; font-size:2.4rem; border-bottom:1px solid var(--line); }
.post .body { padding: 22px; }
.post .meta { font-size:.76rem; color: var(--ink-muted); letter-spacing:.04em; text-transform:uppercase; margin-bottom:10px; }
.post h3 { font-size:1.1rem; margin-bottom:8px; }
.post p { font-size:.9rem; color:var(--ink-muted); }
.pill-tag { display:inline-block; font-size:.72rem; font-weight:600; padding:4px 11px; border-radius:999px; background:rgba(79,124,255,.12); color:var(--brand); border:1px solid rgba(79,124,255,.28); }

/* ---------- Footer ---------- */
.footer { border-top: 1px solid var(--line); margin-top: 40px; background: linear-gradient(180deg, transparent, rgba(10,16,36,.6)); }
.footer-top { display:grid; grid-template-columns: 1.5fr repeat(3, 1fr); gap: clamp(28px,4vw,50px); padding-block: clamp(48px,6vw,72px); }
@media (max-width: 860px){ .footer-top { grid-template-columns: 1fr 1fr; } }
@media (max-width: 520px){ .footer-top { grid-template-columns: 1fr; } }
.footer h4 { font-size:.82rem; letter-spacing:.12em; text-transform:uppercase; color: var(--ink-muted); margin-bottom: 16px; font-family:var(--ff-display); }
.footer ul li { margin-bottom: 10px; }
.footer ul a { font-size:.92rem; color: var(--ink-soft); transition: color .2s; }
.footer ul a:hover { color: var(--brand-2); }
.footer .about p { color: var(--ink-muted); font-size:.92rem; margin: 16px 0; max-width: 34ch; }
.socials { display:flex; gap:10px; }
.socials a { width:40px; height:40px; border-radius:11px; border:1px solid var(--line-strong); display:grid; place-items:center; transition: all .2s; }
.socials a:hover { border-color: var(--brand-2); background: rgba(0,210,198,.1); transform: translateY(-3px); }
.footer-bot { border-top:1px solid var(--line); padding-block: 22px; display:flex; flex-wrap:wrap; gap: 14px; justify-content:space-between; align-items:center; font-size:.84rem; color: var(--ink-muted); }
.footer-bot a:hover { color: var(--brand-2); }

/* ---------- Full-page section scroll (WorldQuant-style, horizontal book-flip) ---------- */
html.fp-on, html.fp-on body { height: 100%; overflow: hidden; }
.fp-on .nav { position: fixed; left: 0; right: 0; top: 0; transition: transform .45s cubic-bezier(.4,0,.2,1), background .3s, border-color .3s; }
.fp-on .nav.nav-hide { transform: translateY(-100%); }

/* panels laid out in a horizontal row; navigation slides left↔right */
.fp-wrap {
  position: fixed; left: 0; right: 0; top: 0; height: 100vh;
  display: flex; flex-wrap: nowrap;
  will-change: transform;
  transition: transform .9s cubic-bezier(.76, 0, .24, 1);
}
.fp-panel {
  flex: 0 0 100vw; width: 100vw; height: 100vh;
  display: flex; flex-direction: column;
  overflow-y: auto; overflow-x: hidden; -webkit-overflow-scrolling: touch;
  position: relative;
  padding: var(--nav-h) 0 66px;            /* safe area: under top nav, above bottom bar */
  scrollbar-width: thin;
}
/* margin:auto centres content when it fits one screen, and lets it scroll (top reachable)
   when it is taller — avoids the flex-center clipping bug */
.fp-panel > * { width: 100%; flex: 0 0 auto; margin-block: auto; }
.fp-panel::-webkit-scrollbar { width: 6px; }
.fp-panel::-webkit-scrollbar-thumb { background: var(--surface-2); border-radius: 6px; }
/* last panel: content on top, footer pinned toward the bottom */
.fp-panel.fp-end { justify-content: space-between; padding-top: calc(var(--nav-h) + 1.5vh); padding-bottom: 60px; }
.fp-panel.fp-end > * { margin-block: 0; }
.fp-panel.fp-end .footer { margin-top: 0; }
.fp-panel.fp-end > .section { flex: 0 0 auto; padding-block: 0 !important; }
.fp-on .fp-end .footer-top { padding-block: clamp(20px, 3vh, 36px); }
.fp-on .fp-end .footer-bot { padding-block: 14px; }
.fp-on .fp-end .cta-band { padding: clamp(22px, 3vh, 36px); }
/* trim oversized section padding + heading spacing so content fits one screen */
.fp-on .section { padding-block: clamp(12px, 2.4vh, 40px) !important; }
.fp-on .section--tight { padding-block: clamp(10px, 1.8vh, 28px) !important; }
.fp-on .section-head { margin-bottom: clamp(18px, 2.6vh, 40px); }
.fp-on .section-head p { margin-top: 12px; }
.fp-on .grid { gap: clamp(13px, 1.5vw, 22px); }
.fp-on .card { padding: clamp(16px, 1.8vw, 26px); }
.fp-on .h-lg { font-size: clamp(1.55rem, 3vw, 2.4rem); }
.fp-on .h-md { font-size: clamp(1.3rem, 2.1vw, 1.7rem); }
.fp-on .lead { font-size: clamp(.97rem, 1.3vw, 1.1rem); line-height: 1.55; }
.fp-on .note-box { margin-top: 16px !important; padding: 13px 17px; }
.fp-on .post .body { padding: 18px; }
.fp-on .post .thumb { aspect-ratio: auto; height: clamp(64px, 9vh, 110px); font-size: 1.9rem; }

/* compact tall split panels (e.g. "Tàng Kinh Các" / SRA) for short screens */
.fp-on .split { gap: clamp(22px, 3.5vw, 52px); align-items: center; }
.fp-on .checklist { gap: clamp(8px, 1.2vh, 12px); }
.fp-on .code-card .bar { padding: 9px 14px; }
.fp-on .code-card pre { padding: 12px 15px; font-size: .73rem; line-height: 1.45; }
.fp-on .panel { padding: clamp(18px, 2.4vw, 30px); }

/* compact the final CTA + footer panel */
.fp-on .fp-end .cta-band { padding: clamp(18px, 2.4vh, 30px); }
.fp-on .fp-end .cta-band .lead { margin-bottom: 0; }
.fp-on .fp-end .footer-top { padding-block: clamp(12px, 1.8vh, 24px); gap: clamp(18px, 2.4vw, 36px); }
.fp-on .fp-end .footer .about p { margin: 9px 0; }
.fp-on .fp-end .footer-bot { padding-block: 11px; }
.fp-on .fp-end .socials a { width: 34px; height: 34px; }
.fp-on .fp-end .footer ul li { margin-bottom: 7px; }
.fp-on .fp-end .footer h4 { margin-bottom: 10px; }
.fp-on .hero { padding-block: 0 !important; }
.fp-on .footer { margin-top: 0; }

/* compact the hero so it fits a single screen in full-page mode */
.fp-on .hero h1 { font-size: clamp(2rem, 4.4vw, 3.4rem); margin: 14px 0; }
.fp-on .hero .lead { font-size: clamp(1rem, 1.5vw, 1.15rem); margin-bottom: 22px; }
.fp-on .hero-stats { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); margin-top: 24px; padding-top: 20px; gap: clamp(10px, 1.4vw, 24px); }
.fp-on .hero-stats > div { min-width: 0; }
.fp-on .hero-stats .num { font-size: clamp(1.3rem, 2vw, 1.9rem); }
.fp-on .hero-stats .lbl { font-size: .72rem; line-height: 1.35; }
.fp-on .hero-visual { min-height: 0; }
.fp-on .orbit { width: min(380px, 78vw); }
.fp-on .hero .btn { padding-top: 12px; padding-bottom: 12px; }

/* bottom progress bar */
.fp-bar {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 150;
  height: 58px; display: flex; align-items: center; gap: clamp(12px, 2vw, 22px);
  padding: 0 clamp(16px, 4vw, 44px);
  background: linear-gradient(0deg, rgba(7,11,24,.94), rgba(7,11,24,0));
  backdrop-filter: blur(10px);
}
.fp-count { font-family: var(--ff-display); font-weight: 600; font-size: .78rem; color: var(--ink-muted); letter-spacing: .1em; white-space: nowrap; }
.fp-count b { color: var(--ink); }
.fp-segs { display: flex; flex: 1; gap: 7px; align-items: center; }
.fp-seg {
  flex: 1; height: 3px; border-radius: 3px; background: var(--line-strong);
  position: relative; overflow: hidden; cursor: pointer; border: none; padding: 0;
  transition: height .25s;
}
.fp-seg .sfill {
  position: absolute; inset: 0; background: var(--grad-brand);
  transform: scaleX(0); transform-origin: left; transition: transform .6s cubic-bezier(.7,0,.2,1);
  border-radius: inherit;
}
.fp-seg.done .sfill, .fp-seg.active .sfill { transform: scaleX(1); }
.fp-seg.active { height: 6px; }
.fp-seg:hover { height: 6px; }
.fp-label { font-family: var(--ff-display); font-weight: 600; font-size: .86rem; color: var(--ink); white-space: nowrap; max-width: 32vw; overflow: hidden; text-overflow: ellipsis; }
@media (max-width: 680px){ .fp-label { display: none; } .fp-bar { height: 50px; } }

/* ---------- Reveal animation (editorial rise + fade) ---------- */
.reveal { opacity:0; transform: translateY(42px); transition: opacity .9s cubic-bezier(.16,.84,.28,1), transform .9s cubic-bezier(.16,.84,.28,1); will-change: opacity, transform; }
.reveal.in { opacity:1; transform: none; }
.reveal[data-d="1"]{ transition-delay:.09s; } .reveal[data-d="2"]{ transition-delay:.18s; } .reveal[data-d="3"]{ transition-delay:.27s; } .reveal[data-d="4"]{ transition-delay:.36s; }
[data-parallax] { will-change: transform; }
/* Note: hero orbit + scroll momentum run even under reduced-motion because the user
   explicitly requested them; we only soften the decorative reveal distance here. */
@media (prefers-reduced-motion: reduce){ .reveal{ transition-duration:.5s; transform: translateY(18px); } }

/* ---------- Misc ---------- */
.divider { height:1px; background: var(--line); border:0; margin: 0; }
.badge-soft { display:inline-flex; gap:7px; align-items:center; font-size:.8rem; padding:6px 13px; border-radius:999px; background:rgba(255,255,255,.04); border:1px solid var(--line); color:var(--ink-soft); }
.note-box { border-left:3px solid var(--brand-2); background: rgba(0,210,198,.06); padding:16px 20px; border-radius: 0 var(--radius-sm) var(--radius-sm) 0; font-size:.92rem; color:var(--ink-soft); }
.kpi-table { width:100%; border-collapse: collapse; font-size:.92rem; }
.kpi-table th, .kpi-table td { text-align:left; padding: 14px 16px; border-bottom:1px solid var(--line); }
.kpi-table th { font-family:var(--ff-display); color: var(--ink-muted); font-weight:600; font-size:.82rem; text-transform:uppercase; letter-spacing:.06em; }
.kpi-table tbody tr:hover { background: rgba(255,255,255,.02); }
.scroll-x { overflow-x:auto; }

.contact-grid { display:grid; grid-template-columns: 1.3fr .9fr; gap: clamp(28px,4vw,56px); align-items:start; }
@media (max-width: 860px){ .contact-grid { grid-template-columns: 1fr; } }

::selection { background: rgba(79,124,255,.4); color:#fff; }
::-webkit-scrollbar { width:11px; height:11px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--surface-2); border-radius:10px; border:2px solid var(--bg); }
::-webkit-scrollbar-thumb:hover { background: #2a3868; }