:root {
  --bg: #0b0b0d;
  --bg-2: #141418;
  --fg: #f4f4f2;
  --muted: #8a8a92;
  --line: #26262c;
  --accent: #d4ff3a;
  --sans: ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --pad: clamp(20px, 5vw, 72px);
  --ease: cubic-bezier(.2, .8, .2, 1);
  --skew: 0deg;           /* JS: theo vận tốc cuộn */
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--sans);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
h1, h2, h3, p { margin: 0; }
a { color: inherit; text-decoration: none; }
em { font-style: normal; color: var(--accent); }
.mono, code, pre { font-family: var(--mono); }
.smile-o { position: relative; }
.smile { display: inline-block; width: .74em; height: .74em; margin: 0 .03em; vertical-align: -.08em; overflow: visible; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
::selection { background: var(--accent); color: var(--bg); }

.eyebrow {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--accent);
  margin-bottom: 20px;
}
h2 {
  font-size: clamp(34px, 5.5vw, 72px);
  line-height: 1.05;
  letter-spacing: -.03em;
  font-weight: 700;
}

/* ---------- Tách chữ: mỗi ký tự chạy theo --sp (0 → 1) ---------- */
.word { display: inline-block; white-space: nowrap; }
.c {
  display: inline-block;
  --t: clamp(0, calc((var(--sp, 0) - var(--i) / var(--n) * .6) / .4), 1);
  opacity: var(--t);
  transform: translateY(calc((1 - var(--t)) * .7em)) rotate(calc((1 - var(--t)) * 14deg)) scale(calc(.6 + var(--t) * .4));
  filter: blur(calc((1 - var(--t)) * 5px));
  will-change: transform, opacity;
}

/* ---------- LOADER ---------- */
.loader {
  position: fixed; inset: 0; z-index: 100;
  display: grid; place-items: center;
  background: var(--bg);
  animation: loader-out .8s var(--ease) 1.5s forwards;
}
.loader svg { width: min(36vw, 220px); overflow: visible; }
.loader use {
  fill: transparent; stroke: var(--accent); stroke-width: 4;
  stroke-dasharray: 1; stroke-dashoffset: 1;
  animation: draw 1.1s var(--ease) forwards, fill-in .4s ease 1.05s forwards;
}
.loader use + use { animation-delay: .2s, 1.1s; }
@keyframes draw { to { stroke-dashoffset: 0; } }
@keyframes fill-in { to { fill: var(--fg); stroke: var(--fg); } }
@keyframes loader-out { to { transform: translateY(-100%); visibility: hidden; } }

/* ---------- PROGRESS + CURSOR ---------- */
.progress {
  position: fixed; top: 0; left: 0; right: 0; height: 2px; z-index: 60;
  background: var(--accent); transform-origin: left; transform: scaleX(0);
}

/* Arm = 13px line from shoulder (16,17). Offsets pin the gripping hand / shoulders to the rope end,
   which sits 32px below the thumb's centre (rig point 20,52). */
.sb { display: none; position: fixed; top: 80px; bottom: 64px; right: 22px; width: 6px; z-index: 60; pointer-events: none; mix-blend-mode: difference; }
.has-scroller { scrollbar-width: none; }
.has-scroller::-webkit-scrollbar { display: none; }
.has-scroller .sb { display: block; }
.sb::before { content: ''; position: absolute; inset: 0 2px; border-radius: 2px; background: var(--line); }
.sb__thumb {
  position: absolute; top: 0; left: 0; width: 6px; min-height: 40px;
  pointer-events: auto; touch-action: none; will-change: transform;
}
.sb__thumb::before { content: ''; position: absolute; inset: -14px -12px; }
.sb__pill { position: absolute; inset: 0; border-radius: 3px; background: var(--accent); }
.sb__fly { position: absolute; inset: 0; }
.sb__rig { position: absolute; left: -17px; top: calc(50% - 20px); width: 40px; height: 60px; overflow: visible; }
.sb__fill { fill: var(--accent); }
.sb__shine { fill: var(--bg); opacity: .3; }
.sb__string { fill: none; stroke: var(--fg); stroke-width: 1; }
.sb__balloon, .sb__chute { display: none; }
.sb__man {
  position: absolute; width: 40px; height: 56px; overflow: visible;
  fill: none; stroke: var(--fg); stroke-width: 2.4; stroke-linecap: round;
}
.sb__eye { fill: var(--fg); stroke: none; }
.sb__man line { transform-box: view-box; }
.sb__leg { transform-origin: 16px 32px; }
.sb__arm { transform-origin: 16px 17px; }

.sb--stand .sb__man { left: -30px; top: calc(100% - 48px); animation: sb-breathe 2.4s ease-in-out infinite; }
.sb--stand .sb__leg--a { transform: rotate(8deg); }
.sb--stand .sb__leg--b { transform: rotate(-8deg); }
.sb--stand .sb__arm--a { transform: rotate(14deg); }
.sb--stand .sb__arm--b { transform: rotate(-10deg); }

.sb--up .sb__pill, .sb--down .sb__pill { opacity: 0; }

.sb--up .sb__balloon { display: inline; }
.sb--up .sb__man {
  left: -6.5px; top: calc(50% + 26.26px);
  transform-origin: 9.5px 5.74px; animation: sb-dangle 2.2s ease-in-out infinite;
}
.sb--up .sb__arm--a { transform: rotate(150deg); }
.sb--up .sb__arm--b { animation: sb-wave .5s ease-in-out infinite alternate; }
.sb--up .sb__leg--a { animation: sb-leg-a 1.1s ease-in-out infinite alternate; }
.sb--up .sb__leg--b { animation: sb-leg-b 1.1s ease-in-out infinite alternate; }

.sb--down .sb__chute { display: inline; }
.sb--down .sb__fly { transform-origin: 3px calc(50% + 4px); animation: sb-glide 2.8s ease-in-out infinite; }
.sb--down .sb__man { left: -13px; top: calc(50% + 15px); }
.sb--down .sb__arm--a { transform: rotate(-78deg); }
.sb--down .sb__arm--b { transform: rotate(78deg); }
.sb--down .sb__leg--a { animation: sb-leg-a 1.4s ease-in-out infinite alternate; }
.sb--down .sb__leg--b { animation: sb-leg-b 1.4s ease-in-out infinite alternate; }

@keyframes sb-breathe { 50% { transform: translateY(-1px); } }
@keyframes sb-dangle { 0%, 100% { transform: rotate(9deg); } 50% { transform: rotate(21deg); } }
@keyframes sb-wave { from { transform: rotate(-110deg); } to { transform: rotate(-160deg); } }
@keyframes sb-leg-a { from { transform: rotate(6deg); } to { transform: rotate(-4deg); } }
@keyframes sb-leg-b { from { transform: rotate(-3deg); } to { transform: rotate(9deg); } }
@keyframes sb-glide { 0%, 100% { transform: rotate(-8deg); } 50% { transform: rotate(8deg); } }

.cursor { display: none; }
.has-cursor, .has-cursor a { cursor: none; }
.has-cursor .cursor { display: block; }
.cursor span {
  position: fixed; top: 0; left: 0; z-index: 90; pointer-events: none; border-radius: 50%;
  mix-blend-mode: difference;
}
.cursor__dot { width: 8px; height: 8px; margin: -4px 0 0 -4px; background: var(--fg); }
.cursor__ring {
  width: 40px; height: 40px; margin: -20px 0 0 -20px;
  border: 1px solid var(--fg);
  transition: width .3s var(--ease), height .3s var(--ease), margin .3s var(--ease), background .3s;
}
.cursor.is-hover .cursor__ring { width: 80px; height: 80px; margin: -40px 0 0 -40px; background: var(--fg); }

/* ---------- NAV ---------- */
.nav {
  position: fixed; inset: 0 0 auto 0; z-index: 50;
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px var(--pad);
  transition: background .3s, border-color .3s;
  border-bottom: 1px solid transparent;
}
.nav.is-solid {
  background: rgba(11, 11, 13, .72);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-color: var(--line);
}
.nav__brand { display: flex; align-items: center; gap: 10px; font-weight: 700; letter-spacing: -.01em; }
.nav__brand > svg {
  width: 30px; height: 22px; fill: var(--fg);
  opacity: 0; transform: translateY(-6px) rotate(-90deg);
  transition: opacity .5s, transform .6s var(--ease);
}
.nav.is-solid .nav__brand > svg { opacity: 1; transform: none; }
.nav__links { display: flex; align-items: center; gap: 28px; font-size: 14px; color: var(--muted); }
.nav__links a { transition: color .2s; }
.nav__links a:hover { color: var(--fg); }
.nav__cta { color: var(--bg) !important; background: var(--accent); padding: 6px 14px; border-radius: 999px; font-weight: 600; }
.lang { display: flex; padding: 2px; border: 1px solid var(--line); border-radius: 999px; font-family: var(--mono); font-size: 12px; }
.lang a {
  padding: 4px 9px; border-radius: 999px;
  color: var(--muted); letter-spacing: .06em;
  transition: color .2s, background .2s;
}
.lang a:hover { color: var(--fg); }
.lang a[aria-current="page"] { background: var(--fg); color: var(--bg); }
[data-magnetic] { display: inline-block; transition: transform .4s var(--ease); }

/* ---------- 1. HERO ---------- */
.hero {
  --p: 0; --mx: 0; --my: 0;
  position: relative; width: 100%;
  height: 100vh; min-height: 560px;
  display: grid; place-items: center;
  overflow: hidden;
  perspective: 1000px;
}
.hero > * { grid-area: 1 / 1; }
.hero__grid {
  position: absolute; inset: -10%; grid-area: auto;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse at center, #000 10%, transparent 65%);
  -webkit-mask-image: radial-gradient(ellipse at center, #000 10%, transparent 65%);
  opacity: calc(.6 - var(--p) * .3);
  transform: rotateX(calc(var(--p) * 55deg)) translateY(calc(var(--p) * 20%)) scale(calc(1 + var(--p) * .6));
}
.glyphs { position: absolute; inset: 0; grid-area: auto; pointer-events: none; }
.glyphs span {
  position: absolute; left: var(--x); top: var(--y);
  font-family: var(--mono); font-size: calc(var(--z) * 22px);
  color: var(--muted); opacity: calc(.15 + var(--z) * .2);
  transform:
    translate(calc(var(--mx) * var(--z) * 40px), calc(var(--my) * var(--z) * 40px + var(--p) * var(--z) * -260px))
    rotate(calc(var(--p) * var(--z) * 90deg));
  animation: glyph-in 1s var(--ease) backwards, float 6s ease-in-out infinite;
  animation-delay: calc(1.8s + var(--z) * .3s), calc(var(--z) * -3s);
}
.glyphs span:nth-child(3n) { color: var(--accent); }
@keyframes glyph-in { from { opacity: 0; } }
@keyframes float { 50% { margin-top: -14px; } }

.hero__mark {
  position: relative;
  width: min(62vw, 560px);
  fill: var(--fg);
  overflow: visible;
  transform:
    rotateY(calc(var(--mx) * 14deg)) rotateX(calc(var(--my) * -14deg))
    scale(calc(1 + var(--p) * .25));
  animation: intro 1.2s var(--ease) 1.6s backwards;
}
.hero__l, .hero__r { transform-box: fill-box; transform-origin: center; }
.hero__l {
  transform: translateX(calc(var(--p) * -120%)) rotate(calc(var(--p) * -14deg));
  opacity: calc(1 - var(--p) * .9);
}
.hero__r {
  transform: translateX(calc(var(--p) * 170%)) rotate(calc(var(--p) * 14deg));
  fill: color-mix(in srgb, var(--fg) calc(100% - var(--p) * 100%), var(--accent));
  opacity: calc(1 - var(--p) * .4);
}
.hero__copy { position: relative; text-align: center; padding: 0 var(--pad); }
.hero__title {
  --sp: clamp(0, calc((var(--p) - .25) / .6), 1);
  font-size: clamp(42px, 8vw, 116px);
  line-height: 1.02;
  letter-spacing: -.045em;
  font-weight: 800;
}
.hero__eyebrow, .hero__sub {
  opacity: clamp(0, calc((var(--p) - .6) * 3), 1);
  transform: translateY(calc((1 - var(--p)) * 30px));
}
.hero__sub { margin-top: 24px; color: var(--muted); font-family: var(--mono); font-size: 14px; }
.hero__cta {
  display: inline-block; margin-top: 28px;
  padding: 14px 28px; border-radius: 999px;
  background: var(--accent); color: var(--bg);
  font-weight: 700; font-size: 15px;
  opacity: clamp(0, calc((var(--p) - .6) * 3), 1);
  transform: translateY(calc((1 - var(--p)) * 30px));
  pointer-events: none;
}
.hero.is-open .hero__cta, .no-motion .hero__cta { pointer-events: auto; }
.no-motion .hero__cta, .hero__cta:focus-visible { opacity: 1; transform: none; }
.hero__hint {
  position: absolute; bottom: 32px; left: 50%; transform: translateX(-50%);
  display: flex; flex-direction: column; align-items: center; gap: 10px;
  font-family: var(--mono); font-size: 12px; color: var(--muted);
  opacity: calc(1 - var(--p) * 5);
  animation: glyph-in 1s 2.2s backwards;
}
.hero__hint > span:first-child {
  width: 1px; height: 40px; background: linear-gradient(var(--accent), transparent);
  animation: hint 1.8s ease-in-out infinite;
}
@keyframes intro { from { opacity: 0; transform: scale(.7) rotate(-20deg); filter: blur(10px); } }
@keyframes hint { 0%, 100% { transform: scaleY(.3); transform-origin: top; } 50% { transform: scaleY(1); } }

/* ---------- 2. MANIFESTO ---------- */
.manifesto {
  --p: 0;
  width: 100%; height: 100vh;
  display: grid; place-items: center;
  padding: 0 var(--pad);
}
.manifesto__text {
  max-width: 1100px;
  font-size: clamp(28px, 4.4vw, 60px);
  line-height: 1.18;
  letter-spacing: -.025em;
  font-weight: 600;
  transform: scale(calc(.92 + var(--p) * .08));
}
.manifesto__text .w {
  display: inline-block; color: #2e2e35;
  transform: translateY(.15em);
  transition: color .3s, transform .5s var(--ease);
}
.manifesto__text .w.on { color: var(--fg); transform: none; }
.manifesto__text .w.on.hl { color: var(--accent); }

/* ---------- 3. BUILD (terminal) ---------- */
.build {
  --p: 0;
  width: 100%; height: 100vh;
  display: grid; grid-template-columns: 1fr 1.25fr; gap: clamp(24px, 5vw, 80px);
  align-items: center;
  padding: 80px var(--pad) 40px;
  background: radial-gradient(circle at 75% 50%, rgba(212, 255, 58, calc(var(--p) * .08)), transparent 55%);
}
.build__phases { list-style: none; padding: 0; margin: 40px 0 0; display: grid; gap: 10px; font-family: var(--mono); font-size: 15px; }
.build__phases li { color: #3a3a42; display: flex; align-items: center; gap: 12px; transition: color .3s; }
.build__phases li::before { content: ""; width: 24px; height: 1px; background: currentColor; transition: width .4s var(--ease); }
.build__phases li.on { color: var(--fg); }
.build__phases li.on::before { width: 48px; background: var(--accent); }

.term {
  border: 1px solid var(--line); border-radius: 16px; overflow: hidden;
  background: #0f0f12;
  box-shadow: 0 40px 120px -40px rgba(212, 255, 58, calc(var(--p) * .35));
  transform: perspective(1200px) rotateY(calc((1 - var(--p)) * -18deg)) rotateX(calc((1 - var(--p)) * 8deg));
}
.term__bar { display: flex; align-items: center; gap: 8px; padding: 14px 16px; border-bottom: 1px solid var(--line); }
.term__bar i { width: 11px; height: 11px; border-radius: 50%; background: #2a2a30; }
.term__bar i:first-child { background: #ff5f57; } .term__bar i:nth-child(2) { background: #febc2e; } .term__bar i:nth-child(3) { background: #28c840; }
.term__bar span { margin-left: 10px; font-family: var(--mono); font-size: 12px; color: var(--muted); }
.term__code { margin: 0; padding: 24px; font-size: clamp(11px, 1.15vw, 15px); line-height: 1.7; color: #d6d6dc; white-space: pre; overflow: hidden; }
.term__code .k { visibility: hidden; }
.term__code .k.on { visibility: visible; }
.term__code .k.caret { position: relative; }
.term__code .k.caret::after {
  content: ""; position: absolute; right: -2px; top: 10%; width: 2px; height: 80%;
  background: var(--accent); animation: blink 1s steps(1) infinite;
}
@keyframes blink { 50% { opacity: 0; } }
.term .kw { color: #c792ea; } .term .str { color: var(--accent); } .term .fn { color: #82aaff; } .term .cm { color: #5c5c66; }
.term__out { padding: 0 24px 24px; font-family: var(--mono); font-size: 13px; color: var(--muted); min-height: 90px; }
.term__out p { opacity: 0; transform: translateX(-10px); transition: opacity .3s, transform .3s var(--ease); }
.term__out p.on { opacity: 1; transform: none; }
.term__out .ok { color: var(--accent); }

/* ---------- 4. SERVICES (horizontal 3D) ---------- */
.services {
  width: 100%; height: 100vh;
  display: flex; flex-direction: column; justify-content: center;
  overflow: hidden;
  background: var(--bg-2);
  border-block: 1px solid var(--line);
}
.services__head { display: flex; justify-content: space-between; align-items: flex-end; gap: 24px; padding: 0 var(--pad); margin-bottom: 48px; }
.services__meta { display: grid; gap: 10px; justify-items: end; color: var(--muted); font-size: 14px; }
.services__meta b { color: var(--fg); font-weight: 600; }
.services__bar { width: 160px; height: 2px; background: var(--line); }
.services__bar i { display: block; height: 100%; background: var(--accent); transform-origin: left; transform: scaleX(var(--p, 0)); }
.services__track {
  display: flex; gap: 24px;
  padding: 0 var(--pad);
  width: max-content;
  will-change: transform;
  perspective: 1400px;
}
.card {
  --d: 0; --ad: 0;
  position: relative;
  width: clamp(280px, 32vw, 420px);
  min-height: 360px;
  padding: 32px;
  display: flex; flex-direction: column;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: var(--bg);
  transform:
    rotateY(calc(var(--d) * -28deg))
    translateZ(calc(var(--ad) * -120px))
    skewX(var(--skew));
  opacity: calc(1 - var(--ad) * .5);
  transition: border-color .3s;
}
.card:hover { border-color: var(--accent); }
.card__no { font-family: var(--mono); color: var(--muted); font-size: 13px; }
.card h3 { font-size: 28px; letter-spacing: -.02em; margin: auto 0 12px; }
.card p { color: var(--muted); margin-bottom: 24px; }
.card code { font-size: 12px; color: var(--accent); }
.card--accent { background: var(--accent); color: var(--bg); border-color: var(--accent); }
.card--accent p, .card--accent .card__no, .card--accent code { color: rgba(11, 11, 13, .7); }

/* ---------- 5. PROCESS ---------- */
.process { padding: 160px var(--pad); }
.process__head { margin-bottom: 80px; }
.process__body { position: relative; max-width: 760px; margin-left: auto; }
.process__line {
  position: absolute; left: 7px; top: 8px; width: 4px; height: calc(100% - 16px);
  overflow: visible;
}
.process__line line {
  stroke: var(--accent); stroke-width: 2; vector-effect: non-scaling-stroke;
  stroke-dasharray: 1; stroke-dashoffset: var(--draw, 1);
}
.process__body::before {
  content: ""; position: absolute; left: 8px; top: 8px; bottom: 8px; width: 2px; background: var(--line);
}
.steps { list-style: none; margin: 0; padding: 0; }
.step {
  position: relative; padding: 0 0 90px 56px;
  opacity: .2; filter: blur(3px); transform: translateX(40px);
  transition: opacity .6s, transform .7s var(--ease), filter .6s;
}
.step:last-child { padding-bottom: 0; }
.step.is-active { opacity: 1; transform: none; filter: none; }
.step__dot {
  position: absolute; left: 0; top: 6px; width: 18px; height: 18px; border-radius: 50%;
  background: var(--bg); border: 2px solid var(--line); z-index: 1;
  transition: background .4s, border-color .4s, box-shadow .4s, transform .5s var(--ease);
}
.step.is-active .step__dot { background: var(--accent); border-color: var(--accent); box-shadow: 0 0 0 8px rgba(212, 255, 58, .15); transform: scale(1.2); }
.step__no { position: absolute; right: 0; top: -20px; font-size: 96px; font-weight: 800; line-height: 1; color: transparent; -webkit-text-stroke: 1px var(--line); }
.step h3 { font-size: clamp(24px, 3vw, 36px); letter-spacing: -.02em; margin-bottom: 8px; }
.step p { color: var(--muted); max-width: 520px; }

/* ---------- 6. BAND ---------- */
.band {
  --p: 0;
  padding: 60px 0; overflow: hidden;
  border-top: 1px solid var(--line);
}
.band__row {
  white-space: nowrap; width: max-content;
  font-size: clamp(64px, 14vw, 220px); font-weight: 900; letter-spacing: -.04em; line-height: .95;
  color: transparent; -webkit-text-stroke: 1.5px #3a3a42;
  transform: translateX(calc(var(--p) * -35%)) skewX(var(--skew));
}
.band__row--fill {
  color: var(--accent); -webkit-text-stroke: 0;
  transform: translateX(calc(-35% + var(--p) * 35%)) skewX(calc(var(--skew) * -1));
}

/* ---------- 7. STACK ---------- */
.stack { --p: 0; padding: 120px 0 160px; }
.stack__head { padding: 0 var(--pad); margin-bottom: 64px; }
.marquee {
  display: grid; gap: 16px; overflow: hidden;
  mask-image: linear-gradient(90deg, transparent, #000 10%, #000 90%, transparent);
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 10%, #000 90%, transparent);
}
.marquee__row { display: flex; gap: 16px; width: max-content; transform: translateX(calc(var(--p) * -30%)) skewX(var(--skew)); }
.marquee__row--rev { transform: translateX(calc(-30% + var(--p) * 30%)) skewX(var(--skew)); }
.marquee span {
  font-size: clamp(22px, 3vw, 40px); font-weight: 700; letter-spacing: -.02em;
  padding: 14px 28px; border: 1px solid var(--line); border-radius: 999px; white-space: nowrap;
  transition: background .3s, color .3s;
}
.marquee span.is-hl { color: var(--accent); border-color: rgba(212, 255, 58, .3); }
.marquee span:hover { background: var(--accent); color: var(--bg); }
.values {
  --sp: 0;
  display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 24px;
  padding: 0 var(--pad); margin-top: 96px;
  perspective: 1000px;
}
.value {
  --t: clamp(0, calc((var(--sp) - var(--k) * .2) / .6), 1);
  border-top: 1px solid var(--line); padding-top: 24px;
  opacity: var(--t);
  transform: translateY(calc((1 - var(--t)) * 120px)) rotateX(calc((1 - var(--t)) * -50deg));
  transform-origin: top;
}
.value__no { font-family: var(--mono); font-size: 13px; color: var(--accent); }
.value h3 { font-size: 22px; margin: 8px 0; }
.value p { color: var(--muted); }

/* ---------- 8. CONTACT ---------- */
.contact {
  --p: 0; --in: 0;
  --dr: clamp(0, calc(var(--in) * .4 + var(--p) / .45 * .6), 1);  /* vẽ nét logo: bắt đầu khi section đang vào màn hình */
  --cr: clamp(0, calc((var(--p) - .4) / .4), 1);    /* vòng tròn lan */
  --sp: clamp(0, calc((var(--p) - .65) / .3), 1);   /* chữ hiện */
  position: relative; width: 100%; height: 100vh;
  display: grid; place-items: center; text-align: center;
  padding: 0 var(--pad); overflow: hidden;
}
.contact > * { grid-area: 1 / 1; }
.contact__bg {
  position: absolute; inset: 0; grid-area: auto;
  background: var(--accent);
  clip-path: circle(calc(var(--cr) * 75%) at 50% 50%);
}
.contact__mark {
  width: min(90vw, 900px);
  transform: scale(calc(.8 + var(--p) * .4)) rotate(calc((1 - var(--dr)) * -10deg));
  opacity: calc(.9 - var(--cr) * .75);
}
.contact__mark .draw {
  fill: transparent;
  stroke: color-mix(in srgb, var(--accent) calc(100% - var(--cr) * 100%), var(--bg));
  stroke-width: 3;
  stroke-dasharray: 1; stroke-dashoffset: calc(1 - var(--dr));
}
.contact__copy { position: relative; color: var(--bg); }
.contact__copy .eyebrow { color: var(--bg); opacity: var(--sp); }
.contact__copy h2 { font-size: clamp(40px, 7vw, 104px); }
.btn {
  margin-top: 40px;
  padding: 18px 34px; border-radius: 999px;
  background: var(--bg); color: var(--accent);
  font-weight: 700; font-size: 18px;
  opacity: clamp(0, calc((var(--sp) - .5) * 2), 1);
}
.btn:hover { box-shadow: 0 16px 40px rgba(11, 11, 13, .35); }

/* ---------- FOOTER ---------- */
.footer {
  display: flex; justify-content: space-between;
  padding: 28px var(--pad); border-top: 1px solid var(--line);
  color: var(--muted); font-size: 13px;
}

/* ---------- Mobile ---------- */
@media (max-width: 820px) {
  .nav__links > a:not(.nav__cta) { display: none; }
  .build { grid-template-columns: 1fr; align-content: center; gap: 28px; padding-top: 90px; }
  .build__phases { display: flex; flex-wrap: wrap; gap: 8px 16px; margin-top: 20px; font-size: 13px; }
  .build__phases li::before { width: 12px; }
  .build__phases li.on::before { width: 20px; }
  .term__code { padding: 16px; font-size: 11px; }
  .services__head { flex-direction: column; align-items: flex-start; }
  .services__meta { justify-items: start; }
  .card { min-height: 320px; padding: 24px; }
  .process { padding: 120px var(--pad); }
  .process__body { margin-left: 0; }
  .step__no { font-size: 64px; }
  .glyphs span:nth-child(n+7) { display: none; }
}

/* ---------- Không có hiệu ứng (reduced motion / JS lỗi) ---------- */
.no-motion .loader { display: none; }
.no-motion .hero { --p: 1; }
.no-motion .hero__l, .no-motion .hero__r { opacity: .1; }
.no-motion .hero__mark, .no-motion .glyphs span, .no-motion .hero__hint { animation: none; }
.no-motion .c { --t: 1; }
.no-motion .manifesto__text .w { color: var(--fg); transform: none; }
.no-motion .build, .no-motion .services, .no-motion .contact { height: auto; min-height: 100vh; padding-block: 120px; }
.no-motion .build { --p: 1; }
.no-motion .build__phases li { color: var(--fg); }
.no-motion .term__code .k, .no-motion .term__out p { visibility: visible; opacity: 1; transform: none; }
.no-motion .services__track { width: auto; overflow-x: auto; scroll-snap-type: x mandatory; padding-bottom: 16px; }
.no-motion .card { flex: 0 0 auto; scroll-snap-align: start; }
.no-motion .step { opacity: 1; transform: none; filter: none; }
.no-motion .process__line line { stroke-dashoffset: 0; }
.no-motion .values { --sp: 1; }
.no-motion .contact { --p: 1; }