/* =========================================================
   Linhanh Systems — stylesheet
   No framework, no web fonts: system font stack only.
   ========================================================= */

:root {
  --bg: #05070f;
  --bg-alt: #080c18;
  --surface: #0b1020;
  --surface-2: #10172b;
  --border: rgba(148, 163, 255, 0.12);
  --border-strong: rgba(148, 163, 255, 0.24);
  --text: #e7eaf3;
  --muted: #9aa3b8;
  --cyan: #22d3ee;
  --violet: #8b5cf6;
  --green: #34d399;
  --red: #f87171;
  --grad: linear-gradient(120deg, var(--cyan), #60a5fa 45%, var(--violet));
  --radius: 18px;
  --header-h: 68px;
  --font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
  --mono: ui-monospace, "SF Mono", "Cascadia Code", "JetBrains Mono", Menlo, Consolas, monospace;
}

/* ---------- base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--header-h) + 12px); -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 400 17px/1.65 var(--font);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
/* faint technical grid behind everything */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(rgba(148, 163, 255, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(148, 163, 255, 0.045) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse at 50% 0%, #000 0%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse at 50% 0%, #000 0%, transparent 75%);
  pointer-events: none;
}
img, svg { display: block; max-width: 100%; }
a { color: var(--cyan); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3 { line-height: 1.15; margin: 0 0 0.6em; letter-spacing: -0.02em; }
h2 { font-size: clamp(1.8rem, 3.6vw, 2.7rem); }
h3 { font-size: 1.15rem; letter-spacing: -0.01em; }
p { margin: 0 0 1em; }
ul, ol { margin: 0; padding: 0; list-style: none; }
::selection { background: rgba(139, 92, 246, 0.45); }
:focus-visible { outline: 2px solid var(--cyan); outline-offset: 3px; border-radius: 6px; }

.container { width: 100%; max-width: 1180px; margin: 0 auto; padding: 0 20px; }
.grad {
  background: var(--grad);
  background-size: 200% 100%;
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  animation: shimmer 6s ease-in-out infinite alternate;
}
@keyframes shimmer { to { background-position: 100% 0; } }

.skip-link { position: absolute; left: -999px; top: 8px; z-index: 100; background: var(--surface); padding: 8px 14px; border-radius: 8px; }
.skip-link:focus { left: 8px; }

/* ---------- buttons ---------- */
.btn {
  --pad: 14px 24px;
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: var(--pad);
  border-radius: 999px;
  border: 1px solid transparent;
  font: 600 0.98rem/1 var(--font);
  color: var(--text);
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.25s ease, background-color 0.2s ease, border-color 0.2s ease;
  white-space: nowrap;
}
.btn:hover { text-decoration: none; transform: translateY(-2px); }
.btn-sm { --pad: 10px 18px; font-size: 0.9rem; }
.btn-primary {
  background: var(--grad);
  background-size: 160% 100%;
  color: #04121a;
  box-shadow: 0 8px 30px -10px rgba(34, 211, 238, 0.6);
}
.btn-primary:hover { background-position: 100% 0; box-shadow: 0 12px 40px -10px rgba(139, 92, 246, 0.75); }
.btn-ghost { border-color: var(--border-strong); background: rgba(255, 255, 255, 0.02); }
.btn-ghost:hover { border-color: var(--cyan); }
.btn[disabled] { opacity: 0.6; cursor: progress; transform: none; }

/* ---------- header ---------- */
.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 50;
  height: var(--header-h);
  transition: background-color 0.3s ease, border-color 0.3s ease;
  border-bottom: 1px solid transparent;
}
.site-header.scrolled {
  background: rgba(5, 7, 15, 0.78);
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  border-bottom-color: var(--border);
}
.nav { height: 100%; display: flex; align-items: center; gap: 24px; }
.brand { display: inline-flex; align-items: center; gap: 12px; color: var(--text); flex: none; }
.brand:hover { text-decoration: none; }
.brand img { width: 42px; height: 42px; transition: transform 0.4s cubic-bezier(.2,.7,.2,1), filter 0.4s ease; }
.brand:hover img { transform: rotate(-8deg) scale(1.06); filter: drop-shadow(0 0 12px rgba(34, 211, 238, 0.55)); }
.brand-name { font-weight: 800; font-size: 1.45rem; line-height: 1; letter-spacing: -0.03em; white-space: nowrap; }
.brand-name span {
  font-weight: 700;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.nav-links { display: flex; gap: 4px; margin-left: auto; }
.nav-links a {
  color: var(--muted);
  font-size: 0.93rem;
  padding: 8px 12px;
  border-radius: 999px;
  transition: color 0.2s ease, background-color 0.2s ease;
}
.nav-links a:hover, .nav-links a.active { color: var(--text); background: rgba(255, 255, 255, 0.05); text-decoration: none; }
.nav-actions { display: flex; align-items: center; gap: 12px; }
.lang-switch { display: flex; padding: 3px; border: 1px solid var(--border); border-radius: 999px; }
.lang-switch button {
  border: 0;
  background: none;
  color: var(--muted);
  font: 600 0.75rem/1 var(--font);
  letter-spacing: 0.04em;
  padding: 7px 9px;
  border-radius: 999px;
  cursor: pointer;
}
.lang-switch button[aria-pressed="true"] { background: var(--surface-2); color: var(--text); }
.nav-toggle { display: none; }

/* ---------- hero ---------- */
.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100svh;
  display: flex;
  align-items: center;
  padding: calc(var(--header-h) + 28px) 0 84px;
  overflow: hidden;
  isolation: isolate;
}
.hero-canvas { position: absolute; inset: 0; width: 100%; height: 100%; z-index: -1; }
.hero-glow {
  position: absolute;
  inset: -20%;
  z-index: -2;
  background:
    radial-gradient(40% 35% at 20% 30%, rgba(34, 211, 238, 0.16), transparent 70%),
    radial-gradient(45% 40% at 80% 60%, rgba(139, 92, 246, 0.2), transparent 70%);
  animation: drift 18s ease-in-out infinite alternate;
}
@keyframes drift { to { transform: translate3d(4%, -3%, 0) rotate(4deg); } }
.hero-inner { max-width: 1180px; }
.hero h1 { font-size: clamp(2.3rem, 6vw, 4.4rem); max-width: 15ch; margin-bottom: 0.4em; }
.lead { font-size: clamp(1.05rem, 1.6vw, 1.25rem); color: var(--muted); max-width: 60ch; }
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 6px 14px 6px 10px;
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  background: rgba(11, 16, 32, 0.6);
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 1.6em;
}
.dot-live { width: 8px; height: 8px; border-radius: 50%; background: var(--green); box-shadow: 0 0 0 0 rgba(52, 211, 153, 0.6); animation: ping 2s infinite; }
@keyframes ping { 70% { box-shadow: 0 0 0 10px rgba(52, 211, 153, 0); } 100% { box-shadow: 0 0 0 0 rgba(52, 211, 153, 0); } }

.typing {
  font: 500 clamp(0.92rem, 1.4vw, 1.05rem)/1.5 var(--mono);
  color: var(--muted);
  margin: 1.1em 0 1.6em;
  min-height: 1.5em;
}
.typing-prompt { color: var(--violet); }
.typing-text { color: var(--cyan); }
.caret {
  display: inline-block;
  width: 0.55em;
  height: 1.1em;
  margin-left: 2px;
  vertical-align: -0.18em;
  background: var(--cyan);
  animation: blink 1s steps(1) infinite;
}
@keyframes blink { 50% { opacity: 0; } }
.hero-ctas { display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: 1.8em; }
.hero-badges { display: flex; flex-wrap: wrap; gap: 10px 22px; font-size: 0.88rem; color: var(--muted); }
.hero-badges li { display: inline-flex; align-items: center; gap: 8px; }
.hero-badges li::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: var(--grad); }

.scroll-hint {
  position: absolute;
  left: 50%;
  bottom: 26px;
  width: 24px;
  height: 38px;
  margin-left: -12px;
  border: 2px solid var(--border-strong);
  border-radius: 14px;
}
.scroll-hint span { position: absolute; left: 50%; top: 7px; width: 4px; height: 8px; margin-left: -2px; border-radius: 2px; background: var(--cyan); animation: wheel 1.8s ease-in-out infinite; }
@keyframes wheel { 0% { opacity: 0; transform: translateY(0); } 30% { opacity: 1; } 100% { opacity: 0; transform: translateY(12px); } }

/* ---------- marquee ---------- */
.stack { padding: 34px 0; border-block: 1px solid var(--border); background: rgba(8, 12, 24, 0.7); }
.stack-title { text-align: center; font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.16em; color: var(--muted); margin-bottom: 18px; }
.marquee {
  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-track { display: flex; width: max-content; animation: marquee 48s linear infinite; }
.marquee:hover .marquee-track { animation-play-state: paused; }
.marquee ul { display: flex; gap: 12px; padding-right: 12px; }
.marquee li {
  white-space: nowrap;
  font: 500 0.9rem/1 var(--mono);
  color: #c5cbe0;
  padding: 10px 16px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
}
@keyframes marquee { to { transform: translateX(-50%); } }

/* ---------- sections ---------- */
.section { padding: clamp(80px, 11vw, 130px) 0; position: relative; }
.section-alt { background: linear-gradient(180deg, var(--bg-alt), var(--bg)); border-top: 1px solid var(--border); }
.section-head { max-width: 760px; margin-bottom: 56px; }
.section-sub { color: var(--muted); font-size: 1.08rem; }
.kicker { font: 500 0.85rem/1 var(--mono); color: var(--cyan); letter-spacing: 0.04em; margin-bottom: 1.2em; }

/* ---------- cards ---------- */
.grid { display: grid; gap: 20px; }
.services { grid-template-columns: repeat(3, 1fr); }
.card {
  position: relative;
  padding: 28px;
  border-radius: var(--radius);
  background: linear-gradient(180deg, var(--surface), rgba(11, 16, 32, 0.6));
  border: 1px solid var(--border);
  overflow: hidden;
  transition: transform 0.35s ease, border-color 0.35s ease, box-shadow 0.35s ease;
}
.card.glow::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(420px circle at var(--mx, 50%) var(--my, -20%), rgba(34, 211, 238, 0.12), transparent 45%);
  opacity: 0;
  transition: opacity 0.3s ease;
  pointer-events: none;
}
.card.glow:hover { border-color: var(--border-strong); transform: translateY(-4px); box-shadow: 0 20px 50px -25px rgba(139, 92, 246, 0.45); }
.card.glow:hover::before { opacity: 1; }
.card h3 { margin-top: 18px; }
.card p { color: var(--muted); font-size: 0.97rem; }
.card-icon {
  width: 48px;
  height: 48px;
  display: grid;
  place-items: center;
  border-radius: 14px;
  background: linear-gradient(var(--surface-2), var(--surface-2)) padding-box, var(--grad) border-box;
  border: 1px solid transparent;
  color: var(--cyan);
}
.card-icon svg { width: 24px; height: 24px; fill: none; stroke: currentColor; stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; }
.tags { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 16px; }
.tags li { font: 500 0.74rem/1 var(--mono); color: #b9c0d6; padding: 6px 9px; border-radius: 7px; background: rgba(148, 163, 255, 0.07); }

/* ---------- integration diagram ---------- */
.flow {
  position: relative;
  padding: 24px;
  border: 1px solid var(--border);
  border-radius: 24px;
  background: radial-gradient(60% 80% at 50% 50%, rgba(139, 92, 246, 0.08), transparent 70%), var(--surface);
}
.flow-svg { width: 100%; height: auto; overflow: visible; }
.flow-lines path {
  fill: none;
  stroke: url(#fg);
  stroke-width: 1.6;
  stroke-opacity: 0.55;
  stroke-dasharray: 6 8;
  animation: dash 1.1s linear infinite;
}
@keyframes dash { to { stroke-dashoffset: -28; } }
.packets circle { fill: var(--cyan); }
.packets circle.out { fill: #a78bfa; }
.nodes rect { fill: var(--bg-alt); stroke: var(--border-strong); stroke-width: 1; }
.nodes.out rect { stroke: rgba(139, 92, 246, 0.45); }
.nodes text { fill: var(--text); font: 500 15px var(--font); text-anchor: middle; }
.hub text { text-anchor: middle; fill: var(--text); }
.hub-title { font: 700 19px var(--font); }
.hub-sub { font: 500 10.5px var(--mono); fill: var(--muted) !important; }
.hub-core { fill: #0d1328; stroke: url(#fg); stroke-width: 2; }
.ring { fill: none; stroke: url(#fg); stroke-opacity: 0.6; transform-box: fill-box; transform-origin: center; }
.ring-1 { stroke-dasharray: 3 9; stroke-width: 2; animation: spin 24s linear infinite; }
.ring-2 { stroke-dasharray: 40 14 4 14; stroke-width: 1.5; animation: spin 14s linear infinite reverse; }
.hub-halo { transform-box: fill-box; transform-origin: center; animation: breathe 4s ease-in-out infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
@keyframes breathe { 50% { transform: scale(1.12); opacity: 0.6; } }

.flow-mobile { display: none; }
.chips { display: flex; flex-wrap: wrap; justify-content: center; gap: 8px; }
.chips li { font-size: 0.85rem; padding: 8px 12px; border: 1px solid var(--border-strong); border-radius: 10px; background: var(--bg-alt); }
.chips-out li { border-color: rgba(139, 92, 246, 0.45); }
.beam {
  width: 2px;
  height: 56px;
  margin: 12px auto;
  background: linear-gradient(180deg, transparent, var(--cyan), transparent) 0 0 / 100% 50% repeat-y;
  animation: beam 1.2s linear infinite;
}
@keyframes beam { to { background-position: 0 56px; } }
.hub-mobile {
  width: 132px;
  height: 132px;
  margin: 0 auto;
  border-radius: 50%;
  display: grid;
  place-content: center;
  text-align: center;
  background: linear-gradient(#0d1328, #0d1328) padding-box, var(--grad) border-box;
  border: 2px solid transparent;
  box-shadow: 0 0 60px -10px rgba(139, 92, 246, 0.6);
  animation: breathe-shadow 4s ease-in-out infinite;
}
.hub-mobile span { font: 500 0.66rem var(--mono); color: var(--muted); }
@keyframes breathe-shadow { 50% { box-shadow: 0 0 90px -5px rgba(34, 211, 238, 0.55); } }

/* ---------- method timeline ---------- */
.timeline {
  --progress: 0;
  position: relative;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  counter-reset: step;
}
.timeline::before, .timeline::after {
  content: "";
  position: absolute;
  top: 23px;
  left: 24px;
  right: 24px;
  height: 2px;
  background: var(--border);
}
.timeline::after {
  background: var(--grad);
  transform-origin: left;
  transform: scaleX(var(--progress));
  box-shadow: 0 0 12px rgba(34, 211, 238, 0.6);
  transition: transform 0.15s linear;
}
.step { position: relative; z-index: 1; }
.step-num {
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  margin-bottom: 22px;
  border-radius: 50%;
  border: 1px solid var(--border-strong);
  background: var(--bg);
  font: 600 0.9rem var(--mono);
  color: var(--muted);
  transition: all 0.4s ease;
}
.step.active .step-num { color: #04121a; background: var(--grad); border-color: transparent; box-shadow: 0 0 24px rgba(34, 211, 238, 0.55); }
.step p { color: var(--muted); font-size: 0.96rem; }
.step-meta { font: 500 0.78rem var(--mono); color: var(--cyan); padding: 5px 10px; border: 1px solid rgba(34, 211, 238, 0.3); border-radius: 999px; }

/* ---------- product ---------- */
.bridge { display: grid; grid-template-columns: 1fr 1.05fr; gap: 56px; align-items: center; }
.checks { margin: 8px 0 32px; display: grid; gap: 12px; }
.checks li { position: relative; padding-left: 34px; color: #cdd3e6; }
.checks li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 3px;
  width: 22px;
  height: 22px;
  border-radius: 7px;
  background: rgba(34, 211, 238, 0.12) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%2322d3ee' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M5 12.5l4.5 4.5L19 7.5'/%3E%3C/svg%3E") center / 14px no-repeat;
}
.terminal {
  border-radius: 16px;
  border: 1px solid var(--border-strong);
  background: #070a14;
  box-shadow: 0 40px 80px -40px rgba(34, 211, 238, 0.35), 0 0 0 1px rgba(139, 92, 246, 0.08) inset;
  overflow: hidden;
}
.terminal-bar { display: flex; align-items: center; gap: 7px; padding: 12px 16px; border-bottom: 1px solid var(--border); background: rgba(255, 255, 255, 0.02); }
.terminal-bar span { width: 11px; height: 11px; border-radius: 50%; background: #2a3150; }
.terminal-bar span:nth-child(1) { background: #f87171; }
.terminal-bar span:nth-child(2) { background: #fbbf24; }
.terminal-bar span:nth-child(3) { background: #34d399; }
.terminal-bar em { margin-left: 10px; font: 500 0.78rem var(--mono); font-style: normal; color: var(--muted); }
.terminal-body {
  margin: 0;
  padding: 20px;
  min-height: 330px;
  font: 400 0.84rem/1.75 var(--mono);
  color: #cdd3e6;
  white-space: pre-wrap;
  word-break: break-word;
}
.terminal-body .t-cmd { color: var(--text); }
.terminal-body .t-dim { color: #6b7591; }
.terminal-body .t-ok { color: var(--green); }
.terminal-body .t-acc { color: var(--cyan); }
.terminal-body .t-vio { color: #a78bfa; }
.terminal-body .t-caret { display: inline-block; width: 0.6em; height: 1.05em; vertical-align: -0.2em; background: var(--cyan); animation: blink 1s steps(1) infinite; }

.labs { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; margin-top: 64px; }
.labs h3 { margin-top: 14px; }
.badge { font: 600 0.7rem/1 var(--mono); text-transform: uppercase; letter-spacing: 0.1em; color: #a78bfa; padding: 6px 9px; border: 1px solid rgba(139, 92, 246, 0.4); border-radius: 999px; }

/* ---------- about ---------- */
.about { display: grid; grid-template-columns: 1.15fr 1fr; gap: 64px; align-items: start; }
.about p:not(.kicker) { color: var(--muted); }
.values { display: grid; gap: 14px; }
.values li {
  padding: 20px 22px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: var(--surface);
  position: relative;
}
.values li::before { content: ""; position: absolute; left: -1px; top: 14px; bottom: 14px; width: 3px; border-radius: 3px; background: var(--grad); }
.values h3 { margin-bottom: 0.3em; font-size: 1.05rem; }
.values p { margin: 0; color: var(--muted); font-size: 0.95rem; }

/* ---------- contact ---------- */
.contact { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: 56px; align-items: start; }
.contact-info { display: grid; gap: 14px; margin-top: 28px; }
.contact-info li { display: grid; gap: 2px; }
.contact-info span { font: 500 0.75rem var(--mono); text-transform: uppercase; letter-spacing: 0.1em; color: var(--muted); }
.form { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; padding: 32px; }
.field { display: grid; gap: 7px; }
.field-full { grid-column: 1 / -1; }
.field label { font-size: 0.86rem; font-weight: 600; color: #c5cbe0; }
.field input, .field select, .field textarea {
  width: 100%;
  font: inherit;
  font-size: 0.97rem;
  color: var(--text);
  background: var(--bg-alt);
  border: 1px solid var(--border-strong);
  border-radius: 12px;
  padding: 12px 14px;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}
.field select { appearance: none; background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%239aa3b8' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E"); background-repeat: no-repeat; background-position: right 12px center; background-size: 18px; padding-right: 40px; }
.field textarea { resize: vertical; min-height: 130px; }
.field input:focus, .field select:focus, .field textarea:focus { outline: none; border-color: var(--cyan); box-shadow: 0 0 0 4px rgba(34, 211, 238, 0.15); }
.field .invalid, .field input:user-invalid, .field textarea:user-invalid { border-color: var(--red); }
.hp { position: absolute; left: -10000px; width: 1px; height: 1px; overflow: hidden; }
.consent { display: flex; gap: 12px; align-items: flex-start; font-size: 0.88rem; color: var(--muted); cursor: pointer; }
.consent input { margin-top: 4px; width: 17px; height: 17px; accent-color: var(--cyan); flex: none; }
.form-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 18px; }
.form-status { margin: 0; font-size: 0.92rem; }
.form-status.ok { color: var(--green); }
.form-status.err { color: var(--red); }
.btn .spinner { width: 16px; height: 16px; border: 2px solid rgba(4, 18, 26, 0.3); border-top-color: #04121a; border-radius: 50%; animation: spin 0.8s linear infinite; }

/* ---------- footer ---------- */
.site-footer { border-top: 1px solid var(--border); padding: 48px 0 40px; background: var(--bg); }
.footer { display: grid; grid-template-columns: 1fr auto; gap: 24px 40px; align-items: start; }
.footer-brand p { margin: 12px 0 0; color: var(--muted); font-size: 0.92rem; }
.footer-links { display: flex; flex-wrap: wrap; gap: 8px 24px; font-size: 0.92rem; }
.footer-links a { color: var(--muted); }
.footer-links a:hover { color: var(--text); }
.footer-fine { grid-column: 1 / -1; margin: 12px 0 0; padding-top: 22px; border-top: 1px solid var(--border); font-size: 0.8rem; color: #6b7591; }

/* ---------- legal pages ---------- */
.legal { padding: calc(var(--header-h) + 60px) 0 90px; }
.legal .container { max-width: 820px; }
.legal h1 { font-size: clamp(2rem, 4vw, 2.8rem); }
.legal h2 { font-size: 1.5rem; margin-top: 2.2em; padding-top: 1em; border-top: 1px solid var(--border); }
.legal h3 { margin-top: 1.6em; }
.legal p, .legal li { color: #c5cbe0; }
.legal ul { list-style: disc; padding-left: 1.3em; margin-bottom: 1em; }
.legal .todo { color: #fbbf24; font-family: var(--mono); font-size: 0.9em; }
[data-lang-block] { display: none; }
html[lang="en"] [data-lang-block="en"],
html[lang="fr"] [data-lang-block="fr"],
html[lang="vi"] [data-lang-block="vi"] { display: block; }

/* ---------- scroll reveal (only hidden when JS can reveal it) ---------- */
@media (scripting: enabled) {
  .reveal { opacity: 0; transform: translateY(26px); transition: opacity 0.8s cubic-bezier(.2,.7,.2,1), transform 0.8s cubic-bezier(.2,.7,.2,1); }
  .reveal.in { opacity: 1; transform: none; }
}

/* ---------- responsive ---------- */
@media (max-width: 1020px) {
  .services { grid-template-columns: repeat(2, 1fr); }
  .bridge, .about, .contact { grid-template-columns: 1fr; gap: 44px; }
}
@media (max-width: 1160px) {
  .nav-links {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 2px;
    padding: 14px 20px 22px;
    background: rgba(5, 7, 15, 0.97);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--border);
    transform: translateY(-12px);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.25s ease, transform 0.25s ease, visibility 0.25s;
  }
  .nav-links.open { opacity: 1; transform: none; visibility: visible; }
  .nav-links a { padding: 12px 14px; font-size: 1rem; }
  .nav-actions { margin-left: auto; }
  .nav-toggle {
    display: grid;
    gap: 6px;
    place-content: center;
    width: 42px;
    height: 42px;
    border: 1px solid var(--border);
    border-radius: 12px;
    background: none;
    cursor: pointer;
  }
  .nav-toggle span { width: 18px; height: 2px; background: var(--text); border-radius: 2px; transition: transform 0.25s ease; }
  .nav-toggle[aria-expanded="true"] span:first-child { transform: translateY(4px) rotate(45deg); }
  .nav-toggle[aria-expanded="true"] span:last-child { transform: translateY(-4px) rotate(-45deg); }
}
@media (max-width: 760px) {
  .flow-svg { display: none; }
  .flow-mobile { display: block; }
  .flow { padding: 28px 16px; }
  .timeline { grid-template-columns: 1fr; gap: 30px; padding-left: 0; }
  .timeline::before, .timeline::after { top: 24px; bottom: 24px; left: 23px; right: auto; width: 2px; height: auto; }
  .timeline::after { transform-origin: top; transform: scaleY(var(--progress)); }
  .step { padding-left: 72px; }
  .step-num { position: absolute; left: 0; top: -6px; }
  .labs { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  body { font-size: 16px; }
  .services { grid-template-columns: 1fr; }
  .nav-cta { display: none; }
  .form { grid-template-columns: 1fr; padding: 22px; }
  .footer { grid-template-columns: 1fr; }
  .terminal-body { font-size: 0.74rem; min-height: 290px; padding: 16px; }
  .brand { gap: 10px; }
  .brand img { width: 36px; height: 36px; }
  .brand-name { font-size: 1.18rem; }
  .lang-switch button { padding: 7px 7px; }
  .nav-actions { gap: 8px; }
}

/* ---------- reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; }
  .reveal { opacity: 1 !important; transform: none !important; }
  .packets { display: none; }
}