/* ============ XTQuantAI landing page ============ */
:root {
  --bg: #0a0e17;
  --bg-raise: #0e141f;
  --bg-card: #101724;
  --line: rgba(148, 170, 205, 0.14);
  --line-strong: rgba(148, 170, 205, 0.28);
  --ink: #e8edf6;
  --ink-dim: #9aa8bd;
  --ink-faint: #66758d;
  --accent: #ff7a1a;
  --radius: 14px;
  --font-display: "Space Grotesk", "Noto Sans SC", sans-serif;
  --font-body: "Noto Sans SC", -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, "SFMono-Regular", Consolas, monospace;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* language switching */
html[data-lang="zh"] .en { display: none !important; }
html[data-lang="en"] .zh { display: none !important; }

::selection { background: color-mix(in oklab, var(--accent) 40%, transparent); }

a { color: inherit; text-decoration: none; }

.wrap { max-width: 1120px; margin: 0 auto; padding: 0 32px; }

/* ---------- nav ---------- */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 50;
  border-bottom: 1px solid transparent;
  transition: background 0.3s, border-color 0.3s;
}
.nav.scrolled {
  background: color-mix(in oklab, var(--bg) 86%, transparent);
  backdrop-filter: blur(14px);
  border-bottom-color: var(--line);
}
.nav-inner {
  display: flex; align-items: center; gap: 28px;
  height: 64px;
}
.brand { display: flex; align-items: center; gap: 10px; font-family: var(--font-display); font-weight: 700; font-size: 17px; letter-spacing: 0.01em; }
.brand-mark {
  width: 26px; height: 26px; border-radius: 7px;
  background: linear-gradient(135deg, var(--accent), color-mix(in oklab, var(--accent) 55%, #ffd9b0));
  display: grid; place-items: center;
  color: #0a0e17; font-family: var(--font-mono); font-size: 13px; font-weight: 700;
}
.nav-links { display: flex; gap: 4px; margin-left: auto; }
.nav-links a {
  font-size: 14px; color: var(--ink-dim); padding: 6px 12px; border-radius: 8px;
  transition: color 0.2s, background 0.2s;
}
.nav-links a:hover { color: var(--ink); background: rgba(148, 170, 205, 0.08); }
.nav-actions { display: flex; align-items: center; gap: 10px; }

.lang-toggle {
  display: flex; border: 1px solid var(--line-strong); border-radius: 8px; overflow: hidden;
  font-size: 12.5px; font-family: var(--font-display);
}
.lang-toggle button {
  background: none; border: none; color: var(--ink-faint); padding: 5px 11px;
  cursor: pointer; font: inherit; transition: color 0.15s, background 0.15s;
}
.lang-toggle button.on { background: rgba(148, 170, 205, 0.12); color: var(--ink); }

.gh-btn {
  display: inline-flex; align-items: center; gap: 8px;
  border: 1px solid var(--line-strong); border-radius: 9px;
  padding: 7px 14px; font-size: 13.5px; color: var(--ink);
  transition: border-color 0.2s, background 0.2s;
}
.gh-btn:hover { border-color: var(--accent); background: color-mix(in oklab, var(--accent) 8%, transparent); }
.gh-btn svg { width: 16px; height: 16px; fill: currentColor; }

/* ---------- hero ---------- */
.hero {
  position: relative;
  padding: 150px 0 90px;
  overflow: hidden;
}
.hero::before {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background:
    radial-gradient(900px 480px at 78% -10%, color-mix(in oklab, var(--accent) 14%, transparent), transparent 65%),
    radial-gradient(700px 420px at 8% 10%, rgba(46, 110, 190, 0.12), transparent 60%);
}
.hero-grid-lines {
  position: absolute; inset: 0; pointer-events: none; opacity: 0.5;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, black 10%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, black 10%, transparent 75%);
}
.hero-inner { position: relative; display: grid; grid-template-columns: 1.05fr 0.95fr; gap: 64px; align-items: center; }

.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 12.5px; font-family: var(--font-mono); color: var(--ink-dim);
  border: 1px solid var(--line-strong); border-radius: 99px; padding: 5px 14px;
  margin-bottom: 26px;
}
.hero-badge .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 8px var(--accent); }

.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(38px, 4.6vw, 56px);
  line-height: 1.16; font-weight: 700; letter-spacing: -0.015em;
  text-wrap: pretty;
}
.hero h1 .hl { color: var(--accent); }
.hero-sub {
  margin-top: 22px; font-size: 17px; color: var(--ink-dim); max-width: 480px;
  text-wrap: pretty;
}
.hero-ctas { margin-top: 36px; display: flex; flex-wrap: wrap; gap: 14px; align-items: center; }

.btn-primary {
  display: inline-flex; align-items: center; gap: 9px;
  background: var(--accent); color: #14181f;
  font-weight: 600; font-size: 15px;
  padding: 12px 24px; border-radius: 11px; border: none; cursor: pointer;
  transition: transform 0.15s, box-shadow 0.2s, filter 0.2s;
  box-shadow: 0 6px 24px color-mix(in oklab, var(--accent) 35%, transparent);
}
.btn-primary:hover { transform: translateY(-1px); filter: brightness(1.06); }
.btn-primary svg { width: 17px; height: 17px; fill: currentColor; }

.clone-pill {
  display: inline-flex; align-items: center; gap: 12px;
  font-family: var(--font-mono); font-size: 13px; color: var(--ink-dim);
  border: 1px solid var(--line-strong); border-radius: 11px;
  background: var(--bg-raise);
  padding: 11px 8px 11px 16px; cursor: pointer;
  transition: border-color 0.2s, color 0.2s;
  max-width: 100%;
}
.clone-pill:hover { border-color: var(--accent); color: var(--ink); }
.clone-pill code { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

.hero-stats { margin-top: 44px; display: flex; gap: 40px; }
.hero-stat .num { font-family: var(--font-display); font-size: 26px; font-weight: 700; color: var(--ink); }
.hero-stat .num em { color: var(--accent); font-style: normal; }
.hero-stat .lbl { font-size: 12.5px; color: var(--ink-faint); letter-spacing: 0.04em; }

/* hero chat mock */
.chat-card {
  position: relative;
  background: linear-gradient(180deg, var(--bg-card), color-mix(in oklab, var(--bg-card) 80%, black));
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.5);
  overflow: hidden;
}
.chat-head {
  display: flex; align-items: center; gap: 8px;
  padding: 13px 18px; border-bottom: 1px solid var(--line);
  font-family: var(--font-mono); font-size: 12px; color: var(--ink-faint);
}
.chat-head .dots { display: flex; gap: 6px; }
.chat-head .dots i { width: 10px; height: 10px; border-radius: 50%; background: rgba(148, 170, 205, 0.25); }
.chat-head .title { margin: 0 auto; }
.chat-body { padding: 22px; display: flex; flex-direction: column; gap: 14px; font-size: 13.5px; }
.msg { max-width: 88%; padding: 11px 15px; border-radius: 12px; line-height: 1.55; }
.msg.user {
  align-self: flex-end;
  background: color-mix(in oklab, var(--accent) 16%, var(--bg-card));
  border: 1px solid color-mix(in oklab, var(--accent) 35%, transparent);
}
.msg.ai { align-self: flex-start; background: rgba(148, 170, 205, 0.07); border: 1px solid var(--line); }
.skill-chip {
  display: inline-flex; align-items: center; gap: 7px;
  font-family: var(--font-mono); font-size: 12px;
  background: rgba(148, 170, 205, 0.08); border: 1px solid var(--line-strong);
  border-radius: 8px; padding: 6px 12px; color: var(--ink-dim);
  align-self: flex-start;
}
.skill-chip .pulse {
  width: 7px; height: 7px; border-radius: 50%; background: var(--accent);
}
.quote-mini {
  align-self: flex-start; width: 88%;
  border: 1px solid var(--line); border-radius: 10px; overflow: hidden;
  font-family: var(--font-mono); font-size: 12.5px;
}
.quote-mini .qrow { display: flex; justify-content: space-between; padding: 9px 14px; }
.quote-mini .qrow + .qrow { border-top: 1px solid var(--line); }
.quote-mini .up { color: #ff5a5a; }
.quote-mini .lbl { color: var(--ink-faint); }

/* ---------- sections ---------- */
section { padding: 96px 0; position: relative; }
.sec-head { max-width: 620px; margin-bottom: 56px; }
.sec-eyebrow {
  font-family: var(--font-mono); font-size: 12.5px; letter-spacing: 0.14em;
  color: var(--accent); text-transform: uppercase; margin-bottom: 14px;
  display: flex; align-items: center; gap: 10px;
}
.sec-eyebrow::before { content: ""; width: 22px; height: 1px; background: var(--accent); }
.sec-head h2 {
  font-family: var(--font-display); font-size: clamp(28px, 3.2vw, 38px);
  font-weight: 700; letter-spacing: -0.01em; line-height: 1.25; text-wrap: pretty;
}
.sec-head p { margin-top: 14px; color: var(--ink-dim); font-size: 16px; text-wrap: pretty; }

/* ---------- skills ---------- */
#skills { background: linear-gradient(180deg, transparent, rgba(148, 170, 205, 0.025) 20%, transparent); }
.skill-group { margin-bottom: 40px; }
.skill-group:last-child { margin-bottom: 0; }
.skill-group-label {
  display: flex; align-items: baseline; gap: 12px; margin-bottom: 18px;
}
.skill-group-label .zh-name, .skill-group-label .en-name { font-family: var(--font-display); font-size: 17px; font-weight: 600; }
.skill-group-label .count { font-family: var(--font-mono); font-size: 12px; color: var(--ink-faint); }
.skills-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.skills-grid.two { grid-template-columns: repeat(2, 1fr); }

.skill-card {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px 26px 24px;
  transition: transform 0.25s cubic-bezier(0.2, 0.7, 0.3, 1), border-color 0.25s, box-shadow 0.25s;
  overflow: hidden;
}
.skill-card::after {
  content: ""; position: absolute; inset: 0 0 auto 0; height: 2px;
  background: linear-gradient(90deg, var(--accent), transparent 70%);
  opacity: 0; transition: opacity 0.25s;
}
.skill-card:hover {
  transform: translateY(-4px);
  border-color: color-mix(in oklab, var(--accent) 38%, var(--line));
  box-shadow: 0 18px 44px rgba(0, 0, 0, 0.38);
}
.skill-card:hover::after { opacity: 1; }
.skill-icon {
  width: 40px; height: 40px; border-radius: 10px;
  display: grid; place-items: center; margin-bottom: 18px;
  background: color-mix(in oklab, var(--accent) 12%, transparent);
  border: 1px solid color-mix(in oklab, var(--accent) 25%, transparent);
  color: var(--accent);
}
.skill-icon svg { width: 20px; height: 20px; stroke: currentColor; fill: none; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; }
.skill-card h3 { font-size: 16.5px; font-weight: 600; margin-bottom: 6px; }
.skill-card .fn {
  font-family: var(--font-mono); font-size: 12px; color: var(--accent);
  opacity: 0.85; display: block; margin-bottom: 12px;
}
.skill-card p { font-size: 13.5px; color: var(--ink-dim); line-height: 1.65; }

/* ---------- how it works ---------- */
.flow {
  display: grid; grid-template-columns: 1fr auto 1fr auto 1fr auto 1fr;
  align-items: stretch; gap: 0;
}
.flow-node {
  background: var(--bg-card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 24px 22px; text-align: center;
  display: flex; flex-direction: column; gap: 6px; justify-content: center;
}
.flow-node.hot { border-color: color-mix(in oklab, var(--accent) 45%, var(--line)); background: color-mix(in oklab, var(--accent) 6%, var(--bg-card)); }
.flow-node .t { font-family: var(--font-display); font-weight: 600; font-size: 15.5px; }
.flow-node .d { font-size: 12.5px; color: var(--ink-dim); }
.flow-node .tag {
  font-family: var(--font-mono); font-size: 10.5px; letter-spacing: 0.1em;
  color: var(--accent); text-transform: uppercase; margin-bottom: 2px;
}
.flow-arrow {
  display: flex; align-items: center; padding: 0 10px;
  color: var(--ink-faint);
}
.flow-arrow svg { width: 22px; height: 22px; stroke: currentColor; fill: none; stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; }
.flow-notes { margin-top: 34px; display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.flow-note {
  border-left: 1px solid var(--line-strong);
  padding: 4px 0 4px 18px; font-size: 13.5px; color: var(--ink-dim);
}
.flow-note b { color: var(--ink); font-weight: 600; display: block; margin-bottom: 3px; font-size: 14px; }

/* ---------- one-click install banner ---------- */
.install-banner {
  display: grid; grid-template-columns: 0.85fr 1.15fr; gap: 28px; align-items: center;
  border: 1px solid color-mix(in oklab, var(--accent) 40%, var(--line));
  border-radius: var(--radius);
  background:
    radial-gradient(420px 200px at 0% 0%, color-mix(in oklab, var(--accent) 12%, transparent), transparent 70%),
    var(--bg-card);
  padding: 30px 32px;
  margin-bottom: 56px;
}
.ib-title {
  display: flex; align-items: center; gap: 10px;
  font-family: var(--font-display); font-size: 21px; font-weight: 700;
  margin-bottom: 8px;
}
.ib-title .bolt {
  width: 30px; height: 30px; border-radius: 8px; flex: none;
  display: grid; place-items: center;
  background: color-mix(in oklab, var(--accent) 16%, transparent);
  border: 1px solid color-mix(in oklab, var(--accent) 35%, transparent);
  color: var(--accent);
}
.ib-title .bolt svg { width: 15px; height: 15px; fill: currentColor; }
.install-banner p { font-size: 13.5px; color: var(--ink-dim); text-wrap: pretty; }
.install-banner .code-block { max-width: none; }
@media (max-width: 980px) { .install-banner { grid-template-columns: 1fr; gap: 18px; padding: 24px; } }

/* new skill chip */
.new-chip {
  position: absolute; top: 16px; right: 16px;
  font-family: var(--font-mono); font-size: 10px; font-weight: 700; letter-spacing: 0.12em;
  color: #14181f; background: var(--accent);
  border-radius: 6px; padding: 3px 8px;
}

.manual-label {
  display: flex; align-items: center; gap: 14px;
  font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.12em;
  color: var(--ink-faint); text-transform: uppercase;
  margin-bottom: 32px;
}
.manual-label::after { content: ""; flex: 1; height: 1px; background: var(--line); }

/* ---------- quick start ---------- */
#start { background: linear-gradient(180deg, transparent, rgba(148, 170, 205, 0.025) 20%, transparent); }
.steps { display: flex; flex-direction: column; gap: 0; max-width: 860px; }
.step { display: grid; grid-template-columns: 56px 1fr; gap: 0 22px; position: relative; padding-bottom: 44px; }
.step:last-child { padding-bottom: 0; }
.step::before {
  content: ""; position: absolute; left: 27px; top: 56px; bottom: 8px; width: 1px;
  background: var(--line-strong);
}
.step:last-child::before { display: none; }
.step-num {
  width: 56px; height: 56px; border-radius: 16px;
  border: 1px solid var(--line-strong); background: var(--bg-card);
  display: grid; place-items: center;
  font-family: var(--font-display); font-size: 19px; font-weight: 700; color: var(--accent);
}
.step-body h3 { font-size: 18px; font-weight: 600; padding-top: 13px; margin-bottom: 8px; }
.step-body > p { font-size: 14.5px; color: var(--ink-dim); max-width: 600px; margin-bottom: 14px; text-wrap: pretty; }
.step-body .hint { font-size: 13px; color: var(--ink-faint); margin-top: 10px; }
.step-body .hint b { color: color-mix(in oklab, var(--accent) 80%, var(--ink)); font-weight: 600; }

.prereqs { display: flex; flex-wrap: wrap; gap: 10px; padding-top: 4px; }
.prereq {
  display: inline-flex; align-items: center; gap: 8px;
  border: 1px solid var(--line-strong); border-radius: 10px;
  background: var(--bg-card); padding: 9px 16px; font-size: 13.5px; color: var(--ink-dim);
}
.prereq i { width: 6px; height: 6px; border-radius: 50%; background: var(--accent); }

/* code blocks */
.code-block {
  position: relative;
  background: #0b101b;
  border: 1px solid var(--line-strong);
  border-radius: 12px;
  overflow: hidden;
  max-width: 720px;
}
.code-block.wide { max-width: none; }
.code-head {
  display: flex; align-items: center; justify-content: space-between;
  padding: 9px 10px 9px 16px; border-bottom: 1px solid var(--line);
  font-family: var(--font-mono); font-size: 11.5px; color: var(--ink-faint);
}
.copy-btn {
  display: inline-flex; align-items: center; gap: 6px;
  background: none; border: 1px solid var(--line-strong); border-radius: 7px;
  color: var(--ink-dim); font-family: var(--font-body); font-size: 12px;
  padding: 4px 11px; cursor: pointer;
  transition: color 0.15s, border-color 0.15s;
}
.copy-btn:hover { color: var(--ink); border-color: var(--accent); }
.copy-btn.copied { color: var(--accent); border-color: var(--accent); }
.copy-btn svg { width: 13px; height: 13px; stroke: currentColor; fill: none; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.code-block pre {
  padding: 16px 20px; overflow-x: auto;
  font-family: var(--font-mono); font-size: 13px; line-height: 1.7;
  color: #c7d3e6;
}
.code-block pre .c { color: #5b6b84; } /* comment */
.code-block pre .k { color: var(--accent); } /* key/keyword */
.code-block pre .s { color: #8fd0a0; } /* string */
.code-block pre .f { color: #7fb3ff; } /* function */

/* ---------- examples ---------- */
.ex-tabs { display: flex; gap: 8px; margin-bottom: 22px; flex-wrap: wrap; }
.ex-tab {
  background: none; border: 1px solid var(--line-strong); border-radius: 99px;
  color: var(--ink-dim); font-family: var(--font-body); font-size: 13.5px;
  padding: 8px 18px; cursor: pointer; transition: all 0.18s;
}
.ex-tab.on { background: color-mix(in oklab, var(--accent) 14%, transparent); border-color: var(--accent); color: var(--ink); }
.ex-tab:hover:not(.on) { color: var(--ink); }
.ex-pane { display: none; }
.ex-pane.on { display: block; }
.ex-cols { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: 28px; align-items: start; }
.ex-desc h3 { font-size: 19px; font-weight: 600; margin-bottom: 10px; padding-top: 6px; }
.ex-desc p { font-size: 14.5px; color: var(--ink-dim); text-wrap: pretty; }
.ex-desc .say {
  margin-top: 18px; border: 1px dashed var(--line-strong); border-radius: 11px;
  padding: 13px 17px; font-size: 13.5px; color: var(--ink-dim);
}
.ex-desc .say b { color: var(--accent); font-weight: 600; }

/* ---------- faq ---------- */
.faq-list { max-width: 820px; }
.faq-item { border-bottom: 1px solid var(--line); }
.faq-item:first-child { border-top: 1px solid var(--line); }
.faq-q {
  width: 100%; background: none; border: none; color: var(--ink);
  font-family: var(--font-body); font-size: 16.5px; font-weight: 600; text-align: left;
  padding: 22px 8px; cursor: pointer;
  display: flex; justify-content: space-between; align-items: center; gap: 20px;
}
.faq-q .chev { flex: none; width: 18px; height: 18px; transition: transform 0.25s; color: var(--ink-faint); }
.faq-q .chev svg { width: 100%; height: 100%; stroke: currentColor; fill: none; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.faq-item.open .chev { transform: rotate(180deg); color: var(--accent); }
.faq-a {
  max-height: 0; overflow: hidden; transition: max-height 0.3s ease;
}
.faq-a-inner { padding: 0 8px 24px; font-size: 14.5px; color: var(--ink-dim); max-width: 680px; text-wrap: pretty; }
.faq-a-inner code {
  font-family: var(--font-mono); font-size: 12.5px;
  background: rgba(148, 170, 205, 0.1); border-radius: 5px; padding: 2px 7px;
  color: color-mix(in oklab, var(--accent) 75%, var(--ink));
}

/* ---------- cta band ---------- */
.cta-band {
  border: 1px solid var(--line-strong);
  border-radius: 20px;
  padding: 64px 48px;
  text-align: center;
  position: relative; overflow: hidden;
  background:
    radial-gradient(600px 280px at 50% 120%, color-mix(in oklab, var(--accent) 16%, transparent), transparent 70%),
    var(--bg-card);
}
.cta-band h2 { font-family: var(--font-display); font-size: clamp(26px, 3vw, 34px); font-weight: 700; margin-bottom: 12px; }
.cta-band p { color: var(--ink-dim); margin-bottom: 30px; }
.cta-band .hero-ctas { margin-top: 0; justify-content: center; }

/* ---------- footer ---------- */
footer { border-top: 1px solid var(--line); padding: 44px 0 56px; margin-top: 40px; }
.foot-inner { display: flex; justify-content: space-between; align-items: flex-start; gap: 32px; flex-wrap: wrap; }
.foot-left .brand { margin-bottom: 10px; }
.foot-left p { font-size: 13px; color: var(--ink-faint); max-width: 380px; }
.foot-links { display: flex; gap: 56px; }
.foot-col h4 { font-size: 12px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink-faint); margin-bottom: 14px; font-weight: 600; }
.foot-col a { display: block; font-size: 14px; color: var(--ink-dim); margin-bottom: 9px; transition: color 0.15s; }
.foot-col a:hover { color: var(--accent); }

/* ---------- reveal animation ---------- */
@media (prefers-reduced-motion: no-preference) {
  body.motion .rv { opacity: 0; transform: translateY(22px); transition: opacity 0.7s ease, transform 0.7s cubic-bezier(0.2, 0.7, 0.3, 1); }
  body.motion .rv.vis { opacity: 1; transform: none; }
  body.motion .rv.d1 { transition-delay: 0.08s; }
  body.motion .rv.d2 { transition-delay: 0.16s; }
  body.motion .rv.d3 { transition-delay: 0.24s; }
  body.motion .skill-chip .pulse { animation: pulse 1.6s ease-in-out infinite; }
  @keyframes pulse { 0%, 100% { box-shadow: 0 0 0 0 color-mix(in oklab, var(--accent) 55%, transparent); } 50% { box-shadow: 0 0 0 6px transparent; } }
}
body:not(.motion) .rv { opacity: 1; transform: none; }

/* ---------- responsive ---------- */
@media (max-width: 980px) {
  .hero-inner { grid-template-columns: 1fr; gap: 48px; }
  .skills-grid, .skills-grid.two { grid-template-columns: repeat(2, 1fr); }
  .flow { grid-template-columns: 1fr; gap: 0; }
  .flow-arrow { justify-content: center; padding: 8px 0; }
  .flow-arrow svg { transform: rotate(90deg); }
  .flow-notes { grid-template-columns: 1fr; }
  .ex-cols { grid-template-columns: 1fr; }
  .nav-links { display: none; }
}
@media (max-width: 640px) {
  .wrap { padding: 0 20px; }
  .skills-grid, .skills-grid.two { grid-template-columns: 1fr; }
  .hero { padding-top: 120px; }
  .hero-stats { gap: 28px; }
  .step { grid-template-columns: 44px 1fr; gap: 0 16px; }
  .step-num { width: 44px; height: 44px; border-radius: 12px; font-size: 16px; }
  .step::before { left: 21px; top: 48px; }
  .cta-band { padding: 48px 24px; }
}