/* =================================================================
   YUSOAI · APPLE STYLE
   极致克制 · 大留白 · SF 风格排版 · 浅色模块 · 产品页气质
================================================================= */

:root {
  --bg: #ffffff;
  --bg-2: #fafafa;
  --bg-3: #f5f5f7;
  --bg-4: #f0f4ff;
  --bg-5: #fdf4f0;
  --ink: #1d1d1f;
  --ink-2: #424245;
  --ink-3: #6e6e73;
  --ink-4: #86868b;
  --line: #d2d2d7;
  --line-2: #e8e8ed;
  --accent: #0071e3;
  --accent-2: #06c;
  --warm: #fbf6ee;
  --mint: #ecf6f1;
  --lavender: #f3f0fa;
  --peach: #fef1ec;
  --sage: #f1f5ed;
  --rose: #fdf1f3;
  --sand: #f6f1e9;
  --dark: #0a0a0c;
  --grad: linear-gradient(180deg, #5b8eff 0%, #c061ff 50%, #ff5ba3 100%);
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.04);
  --shadow: 0 4px 20px rgba(0,0,0,0.06);
  --shadow-lg: 0 20px 60px rgba(0,0,0,0.08);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Helvetica Neue', 'PingFang SC', sans-serif;
  font-feature-settings: 'cv11', 'ss01', 'ss03';
  background: var(--bg);
  color: var(--ink);
  -webkit-font-smoothing: antialiased;
  line-height: 1.4;
  letter-spacing: -0.01em;
}
.container { max-width: 1200px; margin: 0 auto; padding: 0 32px; }
em { font-style: italic; color: var(--ink); }

/* ---------- NAV ---------- */
.nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,0.78);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--line-2);
}
.nav-inner {
  max-width: 1200px; margin: 0 auto; padding: 0 32px;
  display: flex; align-items: center; gap: 32px;
  height: 56px;
}
.brand { display: flex; align-items: center; gap: 8px; text-decoration: none; color: var(--ink); }
.brand-mark {
  height: 22px; width: auto; display: block;
}
.footer-brand .brand-mark {
  height: 22px; margin-bottom: 4px;
}
.brand-name { font-weight: 700; letter-spacing: 0.04em; font-size: 14px; }
.nav-links { display: flex; gap: 28px; flex: 1; margin-left: 16px; }
.nav-links a {
  text-decoration: none; color: var(--ink-2); font-size: 13px;
  transition: color 0.2s;
}
.nav-links a:hover, .nav-links a.active { color: var(--ink); font-weight: 600; }
.nav-cta-group { display: flex; gap: 12px; }
.nav-cta {
  text-decoration: none; font-size: 13px; padding: 7px 14px;
  border-radius: 980px; transition: all 0.2s;
}
.nav-cta.primary { background: var(--ink); color: #fff; }
.nav-cta.primary:hover { background: #000; }
.nav-cta.ghost { color: var(--ink); border: 1px solid var(--line); }
.nav-cta.ghost:hover { border-color: var(--ink); }

/* ---------- HERO ---------- */
.hero {
  position: relative; min-height: 88vh; display: flex;
  align-items: center; justify-content: center;
  text-align: center; padding: 100px 24px 60px;
  background: var(--bg);
  overflow: hidden;
}
.hero-bg {
  position: absolute; inset: 0;
  background:
    radial-gradient(circle at 30% 30%, rgba(91,142,255,0.18), transparent 50%),
    radial-gradient(circle at 70% 60%, rgba(192,97,255,0.16), transparent 50%),
    radial-gradient(circle at 50% 100%, rgba(255,91,163,0.10), transparent 50%);
  filter: blur(40px); z-index: 0;
}
.hero-content { position: relative; z-index: 1; max-width: 920px; }
.hero-eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 13px; color: var(--ink-3); letter-spacing: 0.02em;
  padding: 6px 14px; border-radius: 980px;
  background: var(--bg-3);
  margin-bottom: 28px;
}
.hero-eyebrow .dot { width: 6px; height: 6px; border-radius: 50%; background: #34c759; }
.hero-title {
  font-size: clamp(48px, 8vw, 88px);
  font-weight: 700; letter-spacing: -0.045em;
  line-height: 1.04; margin-bottom: 24px;
}
.hero-title .line1, .hero-title .line2 { display: block; }
.hero-title .grad {
  background: var(--grad);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero-sub {
  font-size: 19px; color: var(--ink-2); line-height: 1.5;
  margin-bottom: 16px;
}
.hero-sub strong { color: var(--ink); font-weight: 600; }
.hero-tag { font-size: 14px; color: var(--ink-3); margin-bottom: 36px; line-height: 1.5; }
.hero-cta { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; margin-bottom: 60px; }
.btn-primary {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--ink); color: #fff;
  padding: 14px 24px; border-radius: 980px;
  text-decoration: none; font-size: 15px; font-weight: 500;
  transition: all 0.2s;
}
.btn-primary:hover { background: #000; transform: translateY(-1px); }
.btn-primary.big { padding: 16px 32px; font-size: 16px; align-self: flex-start; }
.btn-ghost {
  display: inline-flex; align-items: center; gap: 6px;
  color: var(--accent); text-decoration: none; font-size: 15px;
  padding: 14px 8px; font-weight: 500;
}
.btn-ghost:hover { text-decoration: underline; }
.hero-trust {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px;
  padding-top: 32px; border-top: 1px solid var(--line-2);
  max-width: 880px; margin: 0 auto;
}
.hero-trust > div { display: flex; flex-direction: column; align-items: center; gap: 6px; }
.hero-trust strong { font-size: 22px; font-weight: 600; letter-spacing: -0.02em; }
.hero-trust span { font-size: 12px; color: var(--ink-3); }

/* ---------- SECTION ---------- */
section { padding: 56px 0; position: relative; }
.section-head { max-width: 760px; margin: 0 auto 56px; text-align: center; }
.section-title {
  font-size: clamp(32px, 5vw, 48px); font-weight: 700;
  letter-spacing: -0.03em; line-height: 1.1;
  margin-bottom: 16px; color: var(--ink);
}
.section-title.light { color: #fff; }
.section-title em { color: var(--ink); }
.section-title.light em { color: #fff; text-decoration: underline; text-decoration-color: rgba(255,255,255,0.3); }
.section-sub { font-size: 17px; color: var(--ink-2); line-height: 1.55; }
.section-sub.light { color: rgba(255,255,255,0.7); }
.section-sub.light { color: rgba(255,255,255,0.7); }
.section-link {
  display: inline-block; margin-top: 40px;
  color: var(--accent); text-decoration: none; font-size: 15px; font-weight: 500;
}
.section-link:hover { text-decoration: underline; }
.section-link.on-dark { color: #fff; }

/* ---------- PATHS (3.2) ---------- */
.paths { background: var(--bg-3); }
.path-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.path-card {
  background: #fff; border-radius: 22px; padding: 40px;
  display: flex; flex-direction: column; gap: 20px;
  transition: transform 0.3s;
}
.path-card:hover { transform: translateY(-4px); }
.path-card.alt { background: var(--dark); color: #fff; }
.path-card.alt .path-label, .path-card.alt .path-result { color: #fff; }
.path-card.alt .path-meta { color: rgba(255,255,255,0.5); }
.path-card.alt .path-now p { color: rgba(255,255,255,0.65); }
.path-num { font-size: 13px; color: var(--ink-4); letter-spacing: 0.04em; }
.path-card h3 { font-size: 32px; font-weight: 700; letter-spacing: -0.025em; line-height: 1.15; }
.path-now p, .path-then p { font-size: 14px; line-height: 1.5; color: var(--ink-2); }
.path-label { font-size: 11px; color: var(--ink-4); letter-spacing: 0.06em; text-transform: uppercase; margin-bottom: 6px; }
.path-arrow { font-size: 24px; color: var(--ink-4); align-self: flex-start; }
.path-result { font-size: 16px !important; font-weight: 600; }
.path-card .path-result { color: var(--ink) !important; }
.path-card.alt .path-result { color: #fff !important; }
.path-meta { font-size: 12px !important; color: var(--ink-3); }
.path-cta { margin-top: auto; color: var(--accent); text-decoration: none; font-size: 14px; font-weight: 500; }
.path-cta:hover { text-decoration: underline; }

/* ---------- HMI ROUTES (large bordered cards) ---------- */
.hmi-routes-section { background: var(--bg-2); }
.hmi-routes-large {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px;
}
.route-card {
  background: #fff; border: 1px solid var(--line-2);
  border-radius: 22px; padding: 32px;
  display: flex; flex-direction: column; gap: 16px;
  transition: all 0.3s ease; position: relative; overflow: hidden;
}
.route-card::before {
  content: ''; position: absolute; inset: 0;
  border-radius: 22px;
  background: linear-gradient(135deg, rgba(91,142,255,0.04), rgba(192,97,255,0.04));
  opacity: 0; transition: opacity 0.3s ease;
}
.route-card:hover::before { opacity: 1; }
.route-card:hover { transform: translateY(-6px); border-color: var(--ink); box-shadow: var(--shadow-lg); }
.route-card .route-icon-large {
  display: inline-flex; align-items: center; justify-content: center;
  width: 48px; height: 48px; border-radius: 12px;
  background: var(--ink); color: #fff;
  font-size: 14px; font-weight: 700; letter-spacing: 0.05em;
}
.route-card h3 { font-size: 24px; font-weight: 700; letter-spacing: -0.02em; }
.route-card .tagline { font-size: 14px; color: var(--ink-3); margin-bottom: 8px; }
.route-card .spec-block {
  display: flex; flex-direction: column; gap: 10px;
  padding-top: 16px; border-top: 1px solid var(--line-2);
}
.route-card .spec-row {
  display: grid; grid-template-columns: 1fr 1.4fr; gap: 12px;
  font-size: 13px; align-items: start;
}
.route-card .spec-row strong { color: var(--ink-3); font-weight: 500; font-size: 12px; letter-spacing: 0.04em; }
.route-card .spec-row span { color: var(--ink-2); }
.route-card .route-foot {
  display: flex; justify-content: space-between; align-items: center;
  padding-top: 16px; border-top: 1px solid var(--line-2);
  margin-top: auto;
}
.route-card .route-foot .fits { font-size: 12px; color: var(--ink-3); }
.route-card .route-foot a { font-size: 13px; color: var(--accent); text-decoration: none; font-weight: 500; }
.route-card .route-foot a:hover { text-decoration: underline; }

/* ---------- HMI SECTION (3.3) ---------- */
.hmi { background: var(--bg); }
.hmi-routes {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px;
  margin-bottom: 80px;
}
.route {
  background: var(--bg-3); border-radius: 18px; padding: 28px;
  transition: all 0.3s;
}
.route:hover { background: var(--bg-2); box-shadow: var(--shadow); }
.route-icon {
  display: inline-block; padding: 6px 12px;
  background: var(--ink); color: #fff; border-radius: 980px;
  font-size: 11px; font-weight: 600; letter-spacing: 0.05em;
  margin-bottom: 16px;
}
.route h4 { font-size: 22px; font-weight: 600; margin-bottom: 6px; letter-spacing: -0.02em; }
.route-desc { font-size: 13px; color: var(--ink-3); margin-bottom: 20px; }
.route-spec { list-style: none; padding: 0; }
.route-spec li {
  font-size: 13px; color: var(--ink-2); padding: 8px 0;
  border-top: 1px solid var(--line-2);
}
.route-spec li:last-child { border-bottom: 1px solid var(--line-2); }
.route-head { text-align: center; font-size: 13px; color: var(--ink-3); letter-spacing: 0.06em; text-transform: uppercase; margin-bottom: 24px; }

.hmi-advantages { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin-bottom: 80px; }
.adv { padding: 28px 0; }
.adv-no { font-size: 36px; font-weight: 700; color: var(--ink-4); letter-spacing: -0.03em; margin-bottom: 16px; }
.adv h4 { font-size: 22px; font-weight: 600; letter-spacing: -0.02em; margin-bottom: 12px; }
.adv p { font-size: 15px; color: var(--ink-2); line-height: 1.55; }
.adv-head { text-align: center; font-size: 13px; color: var(--ink-3); letter-spacing: 0.06em; text-transform: uppercase; margin-bottom: 24px; }

/* ---------- PROCESS ---------- */
.process { padding-top: 60px; border-top: 1px solid var(--line-2); }
.process-label { text-align: center; font-size: 13px; color: var(--ink-3); letter-spacing: 0.06em; text-transform: uppercase; margin-bottom: 32px; }
.process-track {
  display: flex; gap: 8px; flex-wrap: wrap; justify-content: center;
}
.step {
  flex: 1; min-width: 90px; padding: 14px 8px;
  background: var(--bg-3); border-radius: 12px;
  text-align: center; font-size: 13px; color: var(--ink-2);
  position: relative;
}
.step span { display: block; font-size: 11px; color: var(--ink-4); margin-bottom: 4px; letter-spacing: 0.06em; }
.step.finish { background: var(--ink); color: #fff; }
.step.finish span { color: rgba(255,255,255,0.5); }

/* ---------- PLATFORM (3.4) ---------- */
.platform { background: var(--bg-3); }
.cloud-row { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; margin-bottom: 56px; }
.cloud-pill {
  padding: 10px 18px; background: #fff; border-radius: 980px;
  font-size: 13px; color: var(--ink-2); font-weight: 500;
  border: 1px solid var(--line-2);
}
.pc-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px;
  background: transparent; padding: 0;
}
.pc-grid.wide { grid-template-columns: repeat(4, 1fr); }
.pc-item {
  padding: 24px 22px; border-radius: 16px; background: #fff;
  border: 1px solid var(--line);
  display: flex; flex-direction: column; gap: 8px;
}
.pc-item strong { font-size: 15px; font-weight: 600; color: var(--ink); letter-spacing: -0.01em; }
.pc-item span { font-size: 13px; color: var(--ink-2); line-height: 1.55; }

/* ---------- KIT ---------- */
.kit-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px;
  margin-top: 40px;
}
.kit {
  background: var(--bg); border-radius: 18px; padding: 24px;
  border: 1px solid var(--line-2);
}
.kit-head { font-size: 16px; font-weight: 600; margin-bottom: 16px; letter-spacing: -0.01em; }
.kit-tags { display: flex; flex-wrap: wrap; gap: 6px; }
.kit-tags span {
  font-size: 12px; padding: 4px 10px; background: var(--bg-3);
  border-radius: 980px; color: var(--ink-2);
}

/* ---------- NODE (3.5) ---------- */
.node { background: var(--dark); color: #fff; }
.node .section-sub { color: rgba(255,255,255,0.65); }
.node .section-sub em { color: #fff; font-style: normal; }
.arch {
  display: grid; grid-template-columns: 1fr auto 1fr auto 1fr auto 1fr;
  gap: 12px; align-items: stretch;
  margin: 40px 0;
}
.arch-step {
  padding: 24px; background: #fff;
  border-radius: 16px; border: 1px solid var(--line);
  display: flex; flex-direction: column; gap: 8px;
  align-items: center; text-align: center;
}
.arch-step.highlight { background: var(--ink); border-color: var(--ink); }
.arch-step.warm { background: #1d1d1f; border-color: #1d1d1f; }
.arch-label { font-size: 11px; color: var(--ink-3); letter-spacing: 0.06em; text-transform: uppercase; }
.arch-name { font-size: 18px; font-weight: 600; letter-spacing: -0.01em; color: var(--ink); }
.arch-detail { font-size: 12px; color: var(--ink-3); }
.arch-step.highlight .arch-label,
.arch-step.warm .arch-label { color: rgba(255,255,255,0.5); }
.arch-step.highlight .arch-name,
.arch-step.warm .arch-name { color: #fff; }
.arch-step.highlight .arch-detail,
.arch-step.warm .arch-detail { color: rgba(255,255,255,0.6); }
.arch-arrow { display: flex; align-items: center; justify-content: center; color: var(--ink-3); font-size: 18px; }
.arch.wide {
  grid-template-columns: repeat(4, auto) auto auto auto;
  justify-content: center;
  gap: 16px;
  max-width: 1100px;
  margin: 40px auto 0;
}
.arch-step { min-width: 180px; }

/* ---------- Arch flow (重构: 设备 → YUSOAI → 客户 Cloud → 业务) ---------- */
.arch-section {
  background: var(--bg-3);
  padding: 96px 0 120px;
}
.arch-section .section-title { color: var(--ink); }
.arch-section .section-sub { color: var(--ink-2); }

/* ---------- Modules 2-6: alternating backgrounds (matching contact.html palette) ---------- */
.positioning { background: var(--bg-2); }
.interfaces { background: var(--bg-2); }
.adapter-section { background: var(--bg-3); }
.ops-section { background: var(--bg-2); }

.archflow {
  margin: 56px auto 0;
  padding: 48px 32px 36px;
  max-width: 1100px;
  background: #0a0a0c;
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 22px;
}

.archflow-track {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
}

.arch-node {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.arch-node-pip {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: rgba(255,255,255,0.85);
  margin: 0 auto;
}

.arch-node-yus .arch-node-pip { background: #0071e3; }
.arch-node-warm .arch-node-pip { background: #ff9500; }

.arch-node-card {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 14px;
  padding: 22px 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  flex: 1;
}

.arch-node-tag {
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.55);
  font-weight: 500;
}

.arch-node-yus .arch-node-tag { color: #5b8eff; }
.arch-node-warm .arch-node-tag { color: #ffb874; }

.arch-node-card h5 {
  font-size: 18px;
  font-weight: 600;
  color: #fff;
  letter-spacing: -0.02em;
  line-height: 1.25;
  margin: 0;
}

.arch-node-card p {
  font-size: 13px;
  color: rgba(255,255,255,0.65);
  line-height: 1.5;
  margin: 0;
}

.archflow-legend {
  margin-top: 28px;
  padding-top: 20px;
  border-top: 1px solid rgba(255,255,255,0.06);
  display: flex;
  justify-content: center;
  gap: 32px;
  flex-wrap: wrap;
  font-size: 13px;
  color: rgba(255,255,255,0.65);
}
.archflow-legend > div { display: flex; align-items: center; gap: 8px; }
.archflow-dot {
  width: 8px; height: 8px; border-radius: 50%; display: inline-block;
}
.archflow-dot.mine { background: rgba(255,255,255,0.85); }
.archflow-dot.yus { background: #0071e3; }
.archflow-dot.warm { background: #ff9500; }

@media (max-width: 900px) {
  .archflow { padding: 32px 20px; }
  .archflow-track { grid-template-columns: 1fr; gap: 14px; }
  .arch-node-pip { margin: 0; }
  .archflow-legend { gap: 16px; }
}

/* ---------- SMART HMI (3.6) ---------- */
.smart { background: var(--bg); }
.problem { background: var(--bg-2); }
.solution { background: var(--bg); }
.fit-device { background: var(--bg-3); }
.hmi-sizes {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px;
  margin: 48px 0;
}
.size { text-align: center; }
.size-screen {
  aspect-ratio: 1; max-width: 280px; margin: 0 auto 24px;
  background: var(--bg-3); border-radius: 32px;
  display: flex; align-items: center; justify-content: center;
  position: relative; border: 1px solid var(--line-2);
  overflow: hidden;
}
.size-screen::before {
  content: ''; position: absolute; inset: 4px;
  border-radius: 28px; background: var(--bg);
}
.screen-inner {
  position: relative; font-size: 48px; font-weight: 700;
  letter-spacing: -0.04em; color: var(--ink);
}
.size h4 { font-size: 22px; font-weight: 600; margin-bottom: 6px; letter-spacing: -0.02em; }
.size p { font-size: 14px; color: var(--ink-3); margin-bottom: 16px; }
.size-spec { list-style: none; padding: 0; font-size: 13px; color: var(--ink-2); }
.size-spec li { padding: 4px 0; }
.smart-spec {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px;
  margin-top: 56px; padding-top: 56px; border-top: 1px solid var(--line-2);
}
.smart-spec > div { padding: 20px; background: var(--bg-3); border-radius: 14px; }
.smart-spec strong { display: block; font-size: 13px; color: var(--ink-3); letter-spacing: 0.04em; text-transform: uppercase; margin-bottom: 6px; }
.smart-spec span { font-size: 15px; color: var(--ink); font-weight: 500; }

/* ---------- INDUSTRY (3.7) ---------- */
.industry { background: var(--bg-3); }
.industry-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px;
}
.industry-card {
  background: #fff; border-radius: 22px; padding: 32px;
  display: flex; flex-direction: column; gap: 20px;
}
.industry-tag {
  font-size: 11px; color: var(--ink-3); letter-spacing: 0.06em;
  text-transform: uppercase; font-weight: 500;
}
.industry-card h3 { font-size: 28px; font-weight: 700; letter-spacing: -0.025em; }
.industry-pain, .industry-ans { display: flex; flex-direction: column; gap: 8px; }
.industry-pain span, .industry-ans span {
  font-size: 11px; color: var(--ink-4); letter-spacing: 0.06em; text-transform: uppercase;
}
.industry-pain p, .industry-ans p { font-size: 14px; color: var(--ink-2); line-height: 1.5; }
.industry-meta { padding-top: 16px; border-top: 1px solid var(--line-2); display: flex; flex-direction: column; gap: 4px; }
.industry-meta span { font-size: 11px; color: var(--ink-4); }

/* ---------- WHY (index.html / contact.html) ---------- */
/* .why 继承 body 白底；contact.html 通过 inline style 自定义 */
.why-card {
  background: #fff;
  border-radius: 20px;
  padding: 36px 32px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  border: 1px solid var(--line-2);
  transition: all 0.3s ease;
}
.why-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); border-color: var(--line); }
.why-icon {
  width: 44px; height: 44px;
  border-radius: 12px;
  background: var(--bg-3);
  display: flex; align-items: center; justify-content: center;
  color: var(--ink);
  flex-shrink: 0;
}
.why-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.why-item {
  background: #fff;
  border-radius: 20px;
  padding: 36px 32px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  border: 1px solid var(--line);
  transition: all 0.3s ease;
}
.why-item:hover { transform: translateY(-4px); box-shadow: var(--shadow); border-color: var(--line); }
.why-no {
  width: 44px; height: 44px;
  border-radius: 12px;
  background: var(--bg-3);
  display: flex; align-items: center; justify-content: center;
  color: var(--ink); font-weight: 600; font-size: 14px;
  letter-spacing: -0.01em;
}
.why-item h3 { font-size: 24px; font-weight: 700; letter-spacing: -0.02em; margin: 0; color: var(--ink); }
.why-item p { font-size: 15px; color: var(--ink-2); line-height: 1.6; margin: 0; }

/* ---------- PC CARDS (contact.html 模块三) ---------- */
.pc-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  background: transparent;
  border-radius: 0;
  padding: 0;
}
.pc-card-new {
  background: #fff;
  border: 1px solid var(--line-2);
  border-radius: 22px;
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}
.pc-card-new::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: 22px;
  opacity: 0;
  transition: opacity 0.3s ease;
  pointer-events: none;
}
.pc-card-new:nth-child(1)::after { background: linear-gradient(135deg, rgba(91,142,255,0.04), rgba(91,142,255,0.08)); }
.pc-card-new:nth-child(2)::after { background: linear-gradient(135deg, rgba(52,199,89,0.04), rgba(52,199,89,0.08)); }
.pc-card-new:nth-child(3)::after { background: linear-gradient(135deg, rgba(255,149,0,0.04), rgba(255,149,0,0.08)); }
.pc-card-new:nth-child(4)::after { background: linear-gradient(135deg, rgba(192,97,255,0.04), rgba(192,97,255,0.08)); }
.pc-card-new:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: var(--line); }
.pc-card-new:hover::after { opacity: 1; }
.pc-icon-wrap {
  width: 52px; height: 52px;
  border-radius: 14px;
  background: var(--bg-3);
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.pc-num {
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 14px; font-weight: 600;
  color: var(--ink);
  letter-spacing: 0.02em;
}
.pc-body { display: flex; flex-direction: column; gap: 10px; flex: 1; }
.pc-body h3 { font-size: 22px; font-weight: 700; letter-spacing: -0.02em; margin: 0; }
.pc-body p { font-size: 14px; color: var(--ink-2); line-height: 1.6; margin: 0; }
.pc-foot { padding-top: 12px; border-top: 1px solid var(--line-2); }
.pc-foot a { font-size: 13px; color: var(--accent); text-decoration: none; font-weight: 500; }
.pc-foot a:hover { text-decoration: underline; }

/* ---------- CTA ---------- */
.cta {
  background: var(--dark); color: #fff;
  border-top: 1px solid rgba(255,255,255,0.08);
}
.cta-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: start;
}
.cta-left .section-head { margin-bottom: 32px; }
.cta-title {
  font-size: clamp(36px, 5vw, 56px); font-weight: 700;
  letter-spacing: -0.03em; line-height: 1.1; margin-bottom: 24px;
}
.cta-title em { font-style: normal; background: linear-gradient(90deg, #5b8eff, #c061ff); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
.cta-sub { font-size: 16px; color: rgba(255,255,255,0.7); line-height: 1.55; margin-bottom: 32px; }
.cta-contact { display: flex; flex-direction: column; gap: 12px; }
.cta-contact > div { display: flex; flex-direction: column; gap: 4px; }
.cta-contact strong { font-size: 13px; color: rgba(255,255,255,0.5); letter-spacing: 0.04em; }
.cta-contact span { font-size: 16px; color: #fff; }

/* ---------- FORM ---------- */
.cta-form {
  background: rgba(255,255,255,0.05); border: 1px solid rgba(255,255,255,0.1);
  border-radius: 22px; padding: 32px;
}
.cta-form form {
  display: flex; flex-direction: column; gap: 16px;
}
.cta-form input, .cta-form select, .cta-form textarea {
  background: rgba(255,255,255,0.06); border: 1px solid rgba(255,255,255,0.1);
  color: #fff; padding: 12px 16px; border-radius: 10px; font-size: 14px;
  font-family: inherit; transition: border 0.2s; width: 100%;
}
.cta-form input:focus, .cta-form select:focus, .cta-form textarea:focus {
  outline: none; border-color: rgba(255,255,255,0.3);
}
.cta-form textarea { resize: vertical; min-height: 80px; }
.cta-form button { width: 100%; }
.cta-form .form-checkboxes { display: flex; flex-direction: column; gap: 8px; }
.cta-form .checkbox-label { font-size: 13px; color: rgba(255,255,255,0.5); font-weight: 500; }
.cta-form .checkbox-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px;
}
.cta-form .checkbox-grid label {
  display: flex; align-items: center; gap: 8px;
  font-size: 14px; color: rgba(255,255,255,0.8); cursor: pointer;
  padding: 8px 12px; border-radius: 8px;
  background: rgba(255,255,255,0.03);
  transition: background 0.2s;
}
.cta-form .checkbox-grid label:hover {
  background: rgba(255,255,255,0.06);
}
.cta-form .checkbox-grid input[type="checkbox"] {
  width: auto; margin: 0; cursor: pointer;
  accent-color: #5b8eff;
}
.form-field { display: flex; flex-direction: column; gap: 8px; }
.form-field label { font-size: 13px; color: rgba(255,255,255,0.7); font-weight: 500; }
.form-field input, .form-field select, .form-field textarea {
  background: rgba(255,255,255,0.06); border: 1px solid rgba(255,255,255,0.1);
  color: #fff; padding: 12px 16px; border-radius: 10px; font-size: 14px;
  font-family: inherit; transition: border 0.2s;
}
.form-field input:focus, .form-field select:focus, .form-field textarea:focus {
  outline: none; border-color: rgba(255,255,255,0.4);
}
.form-field textarea { resize: vertical; min-height: 80px; }
.form-field input::placeholder, .form-field textarea::placeholder { color: rgba(255,255,255,0.3); }
.field-hint { font-size: 11px; color: rgba(255,255,255,0.4); }
.pain-chips { display: flex; flex-wrap: wrap; gap: 6px; }
.chip {
  background: rgba(255,255,255,0.06); border: 1px solid rgba(255,255,255,0.1);
  color: rgba(255,255,255,0.8); padding: 7px 12px; border-radius: 980px;
  font-size: 12px; cursor: pointer; transition: all 0.2s;
  font-family: inherit;
}
.chip:hover, .chip.active { background: rgba(0,113,227,0.3); border-color: rgba(0,113,227,0.6); color: #fff; }
.form-foot { font-size: 11px; color: rgba(255,255,255,0.4); }

/* ---------- FAQ ---------- */
.faq { background: var(--bg); }
.faq.on-tint { background: var(--bg-3); }
.faq-list { max-width: 900px; margin: 0 auto; display: flex; flex-direction: column; gap: 8px; }
.faq-item {
  background: #fff; border-radius: 14px; padding: 22px 24px;
  border: 1px solid var(--line-2);
}
.faq-item summary {
  list-style: none; cursor: pointer;
  font-size: 16px; font-weight: 500; color: var(--ink);
  display: flex; justify-content: space-between; align-items: center; gap: 16px;
  letter-spacing: -0.01em;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-toggle {
  width: 24px; height: 24px; border-radius: 50%;
  background: var(--bg-3); position: relative;
  flex-shrink: 0;
  transition: all 0.2s;
}
.faq-toggle::before, .faq-toggle::after {
  content: ''; position: absolute; background: var(--ink-2);
  transition: all 0.2s;
}
.faq-toggle::before { width: 10px; height: 1.5px; top: 50%; left: 50%; transform: translate(-50%, -50%); }
.faq-toggle::after { width: 1.5px; height: 10px; top: 50%; left: 50%; transform: translate(-50%, -50%); }
.faq-item[open] .faq-toggle::after { opacity: 0; }
.faq-item p { margin-top: 16px; font-size: 15px; color: var(--ink-2); line-height: 1.6; }

/* ---------- MATRIX ---------- */
.matrix-section { background: var(--bg); }
.hmi-advantages-section { background: var(--bg-3); }
.matrix { background: var(--bg-3); border-radius: 22px; padding: 8px; }
.matrix-head {
  display: grid; grid-template-columns: 160px 1fr; padding: 16px 24px;
  font-size: 13px; font-weight: 600; color: var(--ink-2); letter-spacing: 0.06em; text-transform: uppercase;
}
.matrix-row {
  display: grid; grid-template-columns: 160px 1fr; padding: 16px 24px;
  border-top: 1px solid var(--line-2);
  transition: background 0.2s;
}
.matrix-row:hover { background: rgba(255,255,255,0.6); }
.matrix-row:nth-child(odd) { background: rgba(255,255,255,0.4); border-radius: 12px; }
.m-layer { font-weight: 600; color: var(--ink); font-size: 14px; }
.m-cap { color: var(--ink-2); font-size: 14px; line-height: 1.6; }

/* ---------- MODULAR BLOCK (small borders, layered) ---------- */
.block {
  background: #fff;
  border: 1px solid var(--line-2);
  border-radius: 18px;
  padding: 28px;
  transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
}
.block:hover { transform: translateY(-4px); box-shadow: var(--shadow); border-color: var(--line); }
.block.accent { border-top: 3px solid var(--ink); }
.block .block-tag {
  display: inline-block; font-size: 11px; color: var(--ink-3);
  letter-spacing: 0.06em; text-transform: uppercase;
  padding: 4px 10px; background: var(--bg-3);
  border-radius: 980px; margin-bottom: 16px; font-weight: 500;
}
.block h3 { font-size: 20px; font-weight: 600; letter-spacing: -0.02em; margin-bottom: 10px; }
.block p { font-size: 14px; color: var(--ink-2); line-height: 1.55; }

/* Page-hero stats */
.page-hero-stats {
  display: grid; grid-template-columns: repeat(4, 1fr);
  max-width: 760px; margin: 40px auto 0;
  padding-top: 32px; border-top: 1px solid var(--line-2);
  gap: 16px;
}
.page-hero-stats > div {
  display: flex; flex-direction: column; gap: 4px; align-items: center;
  text-align: center;
}
.page-hero-stats strong { font-size: 22px; font-weight: 600; letter-spacing: -0.02em; }
.page-hero-stats span { font-size: 12px; color: var(--ink-3); }
.page-hero.dark .page-hero-stats { border-top-color: rgba(255,255,255,0.15); }
.page-hero.dark .page-hero-stats span { color: rgba(255,255,255,0.55); }

/* Process timeline (grouped) */
.process-phases {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px;
}
.process-phase {
  background: #fff; border: 1px solid var(--line-2);
  border-radius: 18px; padding: 24px;
  transition: all 0.3s ease;
}
.process-phase:hover { border-color: var(--ink); transform: translateY(-2px); }
.phase-no { font-size: 13px; color: var(--ink-3); letter-spacing: 0.04em; margin-bottom: 8px; font-weight: 500; }
.phase-name { font-size: 18px; font-weight: 600; margin-bottom: 8px; letter-spacing: -0.01em; }
.phase-steps { font-size: 13px; color: var(--ink-2); line-height: 1.6; }
.phase-steps span { color: var(--ink-4); }

/* Modular service add-ons */
.modular-section { background: var(--bg-3); }
.modular-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px;
}
.modular-card {
  background: #fff;
  border-radius: 18px; padding: 28px;
  display: flex; flex-direction: column; gap: 12px;
  transition: all 0.3s ease;
  position: relative; overflow: hidden;
}
.modular-card::before { content: none; }
.modular-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.modular-card .icon {
  width: 36px; height: 36px; border-radius: 10px;
  background: var(--bg-3); display: flex; align-items: center; justify-content: center;
  font-size: 18px; font-weight: 600; color: var(--ink);
}
.modular-card h4 { font-size: 17px; font-weight: 600; letter-spacing: -0.01em; }
.modular-card p { font-size: 14px; color: var(--ink-2); line-height: 1.55; }

/* Fit cards (use cases) */
.fit-section { background: var(--bg); }
.fit-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.fit-card-large {
  background: #fff; border: 1px solid var(--line-2);
  border-radius: 22px; padding: 32px;
  display: flex; flex-direction: column; gap: 16px;
  transition: all 0.3s ease;
}
.fit-card-large:hover { transform: translateY(-4px); border-color: var(--ink); box-shadow: var(--shadow); }
.fit-card-large .tag {
  font-size: 11px; color: var(--ink-3); letter-spacing: 0.06em;
  text-transform: uppercase; font-weight: 500;
}
.fit-card-large h3 { font-size: 22px; font-weight: 700; letter-spacing: -0.02em; }
.fit-card-large .pain { font-size: 14px; color: var(--ink-2); line-height: 1.55; padding-top: 12px; border-top: 1px solid var(--line-2); }
.fit-card-large .pain-label { font-size: 11px; color: var(--ink-4); letter-spacing: 0.06em; text-transform: uppercase; margin-bottom: 6px; display: block; }

/* Section header chip */
.section-head .chip-row {
  display: inline-flex; gap: 8px; margin-bottom: 16px; flex-wrap: wrap; justify-content: center;
}
.section-head .pill {
  font-size: 12px; padding: 5px 12px; border: 1px solid var(--line);
  border-radius: 980px; color: var(--ink-2); background: #fff;
}

/* Sticky/stagger reveal classes */
.stagger > * {
  opacity: 0; transform: translateY(20px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}
.stagger.visible > *:nth-child(1) { transition-delay: 0ms; opacity: 1; transform: none; }
.stagger.visible > *:nth-child(2) { transition-delay: 80ms; opacity: 1; transform: none; }
.stagger.visible > *:nth-child(3) { transition-delay: 160ms; opacity: 1; transform: none; }
.stagger.visible > *:nth-child(4) { transition-delay: 240ms; opacity: 1; transform: none; }
.stagger.visible > *:nth-child(5) { transition-delay: 320ms; opacity: 1; transform: none; }
.stagger.visible > *:nth-child(6) { transition-delay: 400ms; opacity: 1; transform: none; }
.stagger.visible > *:nth-child(7) { transition-delay: 480ms; opacity: 1; transform: none; }
.stagger.visible > *:nth-child(8) { transition-delay: 560ms; opacity: 1; transform: none; }
.stagger.visible > *:nth-child(9) { transition-delay: 640ms; opacity: 1; transform: none; }
.stagger.visible > *:nth-child(10) { transition-delay: 720ms; opacity: 1; transform: none; }

/* Subtle border separator utility */
.divider {
  max-width: 1200px; margin: 0 auto; height: 1px;
  background: linear-gradient(90deg, transparent, var(--line-2) 20%, var(--line-2) 80%, transparent);
}

/* ---------- VALUE TABLE ---------- */
.value-table { background: #fff; border-radius: 22px; padding: 8px; border: 1px solid var(--line); }
.vt-row {
  display: grid; grid-template-columns: 1fr 1.2fr 1.2fr; gap: 16px;
  padding: 20px 24px; border-top: 1px solid var(--line-2);
  align-items: start;
}
.vt-row:first-child { border-top: none; }
.vt-row.head { font-size: 12px; color: var(--ink-3); letter-spacing: 0.06em; text-transform: uppercase; font-weight: 600; }
.vt-row.head span { font-weight: 600; }
.vt-row span { font-size: 14px; color: var(--ink-2); line-height: 1.6; }
.vt-row span:first-child { color: var(--ink); font-weight: 500; }

/* ---------- PAGE HERO ---------- */
.page-hero {
  padding: 120px 0 80px; text-align: center; background: var(--bg);
  position: relative; overflow: hidden;
}
.page-hero.dark { background: var(--dark); color: #fff; }
.page-hero.dark .page-hero-eyebrow { color: rgba(255,255,255,0.5); }
.page-hero.dark .page-hero-sub { color: rgba(255,255,255,0.7); }
.page-hero.dark .page-hero-claim { color: rgba(255,255,255,0.55); }
.page-hero.dark::before {
  content: ''; position: absolute; inset: 0;
  background:
    radial-gradient(circle at 30% 40%, rgba(91,142,255,0.18), transparent 50%),
    radial-gradient(circle at 70% 60%, rgba(192,97,255,0.16), transparent 50%);
  filter: blur(60px); z-index: 0;
}
.page-hero > .container { position: relative; z-index: 1; }
.page-hero-eyebrow {
  font-size: 13px; color: var(--ink-3); letter-spacing: 0.06em;
  text-transform: uppercase; margin-bottom: 20px;
}
.page-hero-title {
  font-size: clamp(40px, 6vw, 64px); font-weight: 700;
  letter-spacing: -0.04em; line-height: 1.08; margin-bottom: 24px;
}
.page-hero-title em {
  font-style: normal;
  background: var(--grad);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
}
.page-hero-sub { font-size: 19px; color: var(--ink-2); line-height: 1.5; max-width: 720px; margin: 0 auto 32px; }
.page-hero-claim { font-size: 15px; color: var(--ink-3); max-width: 720px; margin: 0 auto 32px; line-height: 1.55; }
.page-hero-claim em { color: var(--accent); font-style: normal; font-weight: 600; }
.page-hero-cta { display: flex; gap: 12px; justify-content: center; }

/* ---------- CLOUD NEUTRAL ---------- */
.cloud-neutral-section { background: var(--bg-3); }
.neutral-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.neutral-item { background: #fff; padding: 28px; border-radius: 18px; }
.neutral-item strong { font-size: 22px; font-weight: 600; letter-spacing: -0.02em; display: block; margin-bottom: 12px; }
.neutral-item p { font-size: 15px; color: var(--ink-2); line-height: 1.55; }
.neutral-points { list-style: none; padding: 0; margin: 18px 0 0; display: flex; flex-direction: column; gap: 14px; border-top: 1px dashed var(--line); padding-top: 18px; }
.neutral-points li { font-size: 14px; color: var(--ink-2); line-height: 1.6; padding-left: 16px; position: relative; }
.neutral-points li::before { content: ''; position: absolute; left: 0; top: 10px; width: 6px; height: 6px; border-radius: 50%; background: var(--accent); }
.neutral-points li strong { display: inline; font-size: 14px; font-weight: 600; color: var(--ink); margin: 0; }

/* platform.html 三大模块差异化背景（仅作用于 platform.html） */
.value-section { background: var(--bg); }
.platform-section { background: var(--bg-3); }
.kit-section { background: var(--bg-2); }

/* ---------- ADAPTER / PROTO / CORE / TRUTH / CORE-LIST ---------- */
.adapter-grid, .problem-grid, .positioning-grid, .ops-grid, .core-list, .truth-grid {
  display: grid; gap: 16px;
}
.adapter-grid { grid-template-columns: repeat(4, 1fr); }
.adapter-item, .prob-item, .ops-item, .core-item, .truth-item {
  background: #fff; border-radius: 18px; padding: 28px;
  border: 1px solid var(--line);
}
.adapter-section .adapter-item { background: #fff; border-color: var(--line); }
.adapter-item h4, .core-item strong { font-size: 18px; font-weight: 600; letter-spacing: -0.01em; margin-bottom: 12px; display: block; }
.core-item span { font-size: 15px; color: var(--ink-2); line-height: 1.55; display: block; margin-top: 6px; }
.adapter-item p, .prob-item span { font-size: 14px; color: var(--ink-2); line-height: 1.55; }
.problem-grid { grid-template-columns: repeat(4, 1fr); }
.prob-item strong, .ops-item strong { display: block; font-size: 16px; font-weight: 600; margin-bottom: 8px; letter-spacing: -0.01em; }
.ops-grid { grid-template-columns: repeat(4, 1fr); }
.ops-item span { font-size: 13px; color: var(--ink-3); }
.positioning-grid { grid-template-columns: repeat(3, 1fr); align-items: stretch; }
.pos-item {
  background: var(--bg-3);
  padding: 36px 32px;
  border-radius: 20px;
  display: flex; flex-direction: column; gap: 14px;
}
.pos-item strong {
  display: block;
  font-size: 13px; letter-spacing: 0.08em;
  text-transform: uppercase; color: var(--ink-4);
  font-weight: 600; margin-bottom: 14px;
}
.pos-item span { font-size: 17px; color: var(--ink-2); line-height: 1.65; }
.proto-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.proto-grid > div { background: #fff; padding: 24px; border-radius: 14px; border: 1px solid var(--line-2); }
.proto-grid span { display: block; font-size: 16px; font-weight: 600; letter-spacing: -0.01em; margin-bottom: 6px; color: var(--ink); }
.proto-grid em { font-size: 12px; color: var(--ink-2); font-style: normal; }
.core-list { grid-template-columns: repeat(1, 1fr); max-width: 720px; margin: 0 auto; }
.core-item { display: grid; grid-template-columns: 140px 1fr; gap: 24px; align-items: start; }
.core-item strong { color: var(--ink-3); font-size: 12px; letter-spacing: 0.06em; text-transform: uppercase; padding-top: 4px; margin: 0; }
.truth-grid { grid-template-columns: repeat(2, 1fr); }
.truth-item.ready { background: #ecf6f1; }
.truth-item.roadmap { background: #fdf1ec; }
.truth-item h4 { font-size: 20px; font-weight: 600; margin-bottom: 12px; letter-spacing: -0.02em; }
.truth-item p { font-size: 14px; color: var(--ink-2); line-height: 1.55; }

/* ---------- FIT (grid) ---------- */
.fit-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.fit-card { background: #fff; border: 1px solid var(--line-2); padding: 24px; border-radius: 18px; transition: all 0.3s ease; }
.fit-card:hover { border-color: var(--ink); transform: translateY(-2px); }
.fit-icon { font-size: 24px; font-weight: 700; color: var(--ink-4); margin-bottom: 16px; }
.fit-card h4 { font-size: 18px; font-weight: 600; letter-spacing: -0.02em; margin-bottom: 8px; }
.fit-card p { font-size: 14px; color: var(--ink-2); line-height: 1.5; }

/* ---------- INDUSTRY DETAIL ---------- */
.industry-section { background: var(--bg-3); }
.industry-detail {
  background: #fff; border-radius: 24px; padding: 56px 64px;
  margin-bottom: 32px; border: 1px solid var(--line-2);
}
.industry-head {
  padding-bottom: 32px; margin-bottom: 40px;
  border-bottom: 1px solid var(--line-2);
}
.industry-head h2 { font-size: 40px; font-weight: 700; letter-spacing: -0.03em; margin: 0 0 8px; }
.industry-tagline { font-size: 16px; color: var(--ink-3); margin: 0; }
.industry-compare {
  display: grid; grid-template-columns: 1fr 1fr; gap: 48px;
  margin-bottom: 48px;
}
.industry-compare-item .industry-compare-label {
  font-size: 12px; color: var(--ink-4); letter-spacing: 0.08em;
  text-transform: uppercase; font-weight: 600;
  padding-bottom: 12px; margin-bottom: 16px;
  border-bottom: 1px solid var(--line-2);
}
.industry-compare-item p { font-size: 16px; color: var(--ink-2); line-height: 1.65; margin: 0; }
.industry-meta {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px;
  padding: 24px 0; margin-bottom: 40px;
  border-top: 1px solid var(--line-2);
  border-bottom: 1px solid var(--line-2);
}
.industry-meta-item .industry-meta-label {
  font-size: 12px; color: var(--ink-4); letter-spacing: 0.08em;
  text-transform: uppercase; font-weight: 600; margin-bottom: 8px;
}
.industry-meta-item p { font-size: 15px; color: var(--ink); line-height: 1.5; margin: 0; }
.industry-cta {
  display: inline-block; font-size: 15px; font-weight: 500;
  color: var(--ink); text-decoration: none;
  padding-bottom: 2px; border-bottom: 1px solid var(--ink);
}
.industry-cta:hover { color: var(--accent); border-bottom-color: var(--accent); }

/* ---------- FOOTER ---------- */
.footer { background: var(--bg-2); padding: 80px 0 0; border-top: 1px solid var(--line-2); }
.footer-inner { display: grid; grid-template-columns: 1.4fr 2fr; gap: 64px; padding-bottom: 60px; }
.footer-brand strong { font-size: 18px; font-weight: 700; letter-spacing: 0.04em; display: block; margin: 12px 0 8px; }
.footer-brand p { font-size: 13px; color: var(--ink-3); line-height: 1.5; }
.footer-brand .footer-tag { font-size: 12px; color: var(--ink-4); margin-top: 8px; }
.footer-cols { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; }
.footer-cols > div { display: flex; flex-direction: column; gap: 8px; }
.footer-cols strong { font-size: 12px; color: var(--ink-3); letter-spacing: 0.06em; text-transform: uppercase; margin-bottom: 8px; }
.footer-cols a { font-size: 13px; color: var(--ink-2); text-decoration: none; }
.footer-cols a:hover { color: var(--ink); }
.footer-cols span { font-size: 12px; color: var(--ink-4); }
.footer-bottom {
  padding: 20px 0; border-top: 1px solid var(--line-2);
  display: flex; flex-direction: column; align-items: center; gap: 8px;
  text-align: center;
  font-size: 12px; color: var(--ink-4);
}

/* ---------- RESPONSIVE ---------- */
@media (max-width: 900px) {
  section { padding: 56px 0; }
  .container { padding: 0 20px; }
  .hero-trust { grid-template-columns: repeat(2, 1fr); gap: 16px; }
  .arch, .arch.wide { grid-template-columns: 1fr; }
  .arch-arrow { transform: rotate(90deg); }
  .pc-grid.wide { grid-template-columns: 1fr 1fr; }
  .hero-title { font-size: 44px; }
  .section-title, .page-hero-title { font-size: 36px; }
  .industry-detail { padding: 36px 28px; }
  .industry-head h2 { font-size: 28px; }
  .industry-compare, .industry-meta { grid-template-columns: 1fr; gap: 32px; }
  .positioning-grid { grid-template-columns: 1fr; }
}

/* Scroll reveal animation */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- Process timeline (NPI → MP) ---------- */
.process-section { background: var(--bg); }
.process-timeline {
  position: relative;
  display: grid;
  grid-template-columns: repeat(10, 1fr);
  gap: 8px;
  padding: 24px 0 12px;
}
.tl-rail {
  position: absolute;
  left: 4%; right: 4%;
  top: 36px;
  height: 2px;
  background: linear-gradient(90deg,
    rgba(0,0,0,0) 0%,
    var(--ink-3) 8%,
    var(--ink-3) 92%,
    rgba(0,0,0,0) 100%);
  opacity: 0.35;
  z-index: 0;
}
.tl-phase {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  cursor: pointer;
  transition: transform 0.25s ease;
}
.tl-phase:hover { transform: translateY(-4px); }
.tl-phase.active .tl-card {
  border-color: var(--ink);
  background: #fff;
  box-shadow: 0 8px 24px rgba(0,0,0,0.08);
  transform: translateY(-2px);
}
.tl-marker {
  width: 56px; height: 56px;
  border-radius: 50%;
  background: #fff;
  border: 2px solid var(--line);
  display: flex; align-items: center; justify-content: center;
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 13px; font-weight: 600;
  color: var(--ink);
  margin-bottom: 14px;
  transition: all 0.25s ease;
}
.tl-phase:hover .tl-marker,
.tl-phase.active .tl-marker {
  background: var(--ink);
  color: #fff;
  border-color: var(--ink);
  transform: scale(1.08);
}
.tl-card {
  width: 100%;
  background: #fff;
  border: 1px solid var(--line-2);
  border-radius: 14px;
  padding: 14px 12px;
  min-height: 168px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  flex: 1;
  transition: all 0.25s ease;
}
.tl-card h4 {
  font-size: 14px;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 2px 0 4px;
  color: var(--ink);
}
.tl-card p {
  font-size: 12px;
  line-height: 1.5;
  color: var(--ink-2);
}
.tl-deliver {
  margin-top: auto;
  padding-top: 8px;
  border-top: 1px dashed var(--line-2);
  font-size: 11px;
  color: var(--ink-2);
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.tl-deliver span {
  font-size: 10px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--ink-3);
  font-weight: 500;
}
.tl-feature .tl-marker {
  background: var(--ink);
  color: #fff;
  border-color: var(--ink);
}
.tl-strip {
  margin-top: 32px;
  padding: 16px 24px;
  background: #fff;
  border: 1px solid var(--line-2);
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  font-size: 13px;
  color: var(--ink-2);
}
.tl-strip-item {
  display: flex; align-items: center; gap: 8px;
  font-weight: 500;
}
.tl-strip-dot {
  width: 8px; height: 8px; border-radius: 50%;
  display: inline-block;
}
.tl-strip-dot.a { background: #4f7cff; }
.tl-strip-dot.b { background: #f59e0b; }
.tl-strip-dot.c { background: #10b981; }
.tl-strip-meta {
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 12px;
  color: var(--ink);
  font-weight: 600;
}
@media (max-width: 1024px) {
  .process-timeline {
    grid-template-columns: repeat(5, 1fr);
    row-gap: 24px;
  }
  .tl-rail { display: none; }
}
@media (max-width: 640px) {
  .process-timeline {
    grid-template-columns: repeat(2, 1fr);
  }
  .tl-strip { flex-wrap: wrap; gap: 12px; }
}

/* =================================================================
   MOBILE NAVIGATION
================================================================= */
/* Desktop: hamburger invisible (shown only inside @media below) */
.hamburger {
  flex-direction: column;
  justify-content: space-between;
  width: 24px;
  height: 18px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  flex-shrink: 0;
  visibility: hidden;
}
.hamburger span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--ink);
  border-radius: 2px;
  transition: all 0.3s ease;
  transform-origin: center;
}
.hamburger.is-active span:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}
.hamburger.is-active span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}
.hamburger.is-active span:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

.mobile-menu {
  display: none;
  position: fixed;
  inset: 56px 0 0 0;
  background: rgba(255, 255, 255, 0.97);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  z-index: 99;
  overflow-y: auto;
  padding: 0 0 32px;
}
.mobile-menu.is-open {
  display: block;
  animation: slideDown 0.25s ease;
}
@keyframes slideDown {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}
.mobile-menu-inner {
  padding: 24px 24px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}
.mobile-nav-links {
  display: flex;
  flex-direction: column;
  gap: 0;
  border-top: 1px solid var(--line-2);
}
.mobile-nav-links a {
  display: block;
  padding: 16px 0;
  font-size: 17px;
  font-weight: 500;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--line-2);
  transition: color 0.2s;
}
.mobile-nav-links a:hover { color: var(--accent); }
.mobile-nav-ctas {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.mobile-nav-ctas a {
  display: block;
  text-align: center;
  padding: 14px 24px;
  border-radius: 980px;
  font-size: 15px;
  font-weight: 500;
  text-decoration: none;
  transition: all 0.2s;
}
.mobile-nav-ctas a.btn-primary {
  background: var(--ink);
  color: #fff;
}
.mobile-nav-ctas a.btn-primary:hover { background: #000; }
.btn-ghost-dark {
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--line);
}
.btn-ghost-dark:hover { border-color: var(--ink); }

/* =================================================================
   RESPONSIVE · MOBILE ADAPTATION
================================================================= */

/* Tablet */
@media (max-width: 1024px) {
  .hmi-routes { grid-template-columns: repeat(3, 1fr); gap: 12px; }
  .hmi-advantages { grid-template-columns: repeat(3, 1fr); gap: 16px; }
  .pc-grid:not(.wide) { grid-template-columns: repeat(2, 1fr); }
  .pc-grid.wide { grid-template-columns: repeat(3, 1fr); }
  .kit-grid { grid-template-columns: repeat(2, 1fr); }
  .smart-spec { grid-template-columns: repeat(2, 1fr); }
  .page-hero-stats { grid-template-columns: repeat(2, 1fr); }
  .arch.wide { gap: 8px; }
  .arch-step { min-width: 140px; }
}

/* Mobile breakpoint — show hamburger, hide desktop nav */
@media (max-width: 900px) {
  /* Nav */
  .nav-links,
  .nav-cta-group { display: none !important; }
  .hamburger { display: flex; visibility: visible; margin-left: auto; }
  .nav-inner { padding: 0 20px; }

  /* Hero */
  .hero { min-height: auto; padding: 80px 20px 60px; }
  .hero-title { font-size: clamp(36px, 10vw, 56px); }
  .hero-sub { font-size: 16px; }
  .hero-trust { grid-template-columns: repeat(2, 1fr); gap: 16px; padding-top: 24px; }
  .hero-trust strong { font-size: 20px; }
  .hero-tag { font-size: 13px; }
  .hero-cta { flex-direction: column; align-items: flex-start; }
  .btn-primary.big { align-self: auto; }

  /* Section */
  section { padding: 48px 0; }
  .section-title { font-size: clamp(28px, 7vw, 40px); }

  /* Paths */
  .path-grid { grid-template-columns: 1fr; gap: 12px; }
  .path-card { padding: 28px; }
  .path-card h3 { font-size: 26px; }

  /* HMI Routes */
  .hmi-routes { grid-template-columns: 1fr; margin-bottom: 48px; }
  .hmi-routes-large { grid-template-columns: 1fr; }
  .route { padding: 20px; }
  .route h4 { font-size: 18px; }

  /* HMI Advantages */
  .hmi-advantages { grid-template-columns: 1fr; gap: 0; margin-bottom: 48px; }
  .adv { padding: 24px 0; border-top: 1px solid var(--line-2); }
  .adv:first-child { border-top: none; }

  /* Process */
  .process { padding-top: 40px; }
  .process-track { gap: 6px; }
  .step { min-width: 70px; padding: 10px 6px; font-size: 12px; }

  /* Platform */
  .cloud-row { gap: 8px; }
  .cloud-pill { font-size: 12px; padding: 8px 14px; }
  .pc-grid { grid-template-columns: 1fr 1fr; }
  .pc-grid.wide { grid-template-columns: 1fr; }
  .kit-grid { grid-template-columns: 1fr; }

  /* Node / Arch */
  .arch,
  .arch.wide {
    grid-template-columns: 1fr;
    gap: 8px;
    max-width: 480px;
    margin: 32px auto 0;
  }
  .arch-arrow { display: none; }
  .arch-step { min-width: auto; flex-direction: row; text-align: left; align-items: center; gap: 16px; padding: 16px; }
  .arch-node-card { flex-direction: row; align-items: center; }
  .arch-node-pip { margin: 0; }

  /* Smart HMI */
  .hmi-sizes { grid-template-columns: 1fr; gap: 32px; }
  .size-screen { max-width: 200px; }
  .smart-spec { grid-template-columns: 1fr 1fr; }

  /* Industry */
  .industry-grid { grid-template-columns: 1fr; gap: 12px; }
  .industry-card { padding: 24px; }

  /* Why */
  .why-grid { grid-template-columns: 1fr; gap: 12px; }

  /* CTA */
  .cta-inner { grid-template-columns: 1fr; gap: 40px; }
  .cta-title { font-size: clamp(28px, 7vw, 44px); }
  .cta-form { padding: 24px; }

  /* Footer */
  .footer-inner { grid-template-columns: 1fr; gap: 40px; }
  .footer-cols { grid-template-columns: repeat(2, 1fr); }

  /* Industry detail */
  .industry-detail { padding: 28px 20px; }
  .industry-head h2 { font-size: 24px; }

  /* Positioning */
  .positioning-grid { grid-template-columns: 1fr; }

  /* Process timeline */
  .process-timeline { grid-template-columns: repeat(5, 1fr); }
  .tl-rail { display: none; }

  /* Modular */
  .modular-grid { grid-template-columns: 1fr; }

  /* Fit */
  .fit-grid { grid-template-columns: 1fr 1fr; }

  /* Neutral */
  .neutral-grid { grid-template-columns: 1fr; }

  /* Adapter */
  .adapter-grid { grid-template-columns: repeat(2, 1fr); }

  /* Problem */
  .problem-grid { grid-template-columns: repeat(2, 1fr); }

  /* Ops */
  .ops-grid { grid-template-columns: repeat(2, 1fr); }

  /* Truth */
  .truth-grid { grid-template-columns: 1fr; }

  /* Proto */
  .proto-grid { grid-template-columns: 1fr; }

  /* Page hero */
  .page-hero { padding: 100px 20px 60px; }
  .page-hero-title { font-size: clamp(32px, 8vw, 52px); }
  .page-hero-stats { grid-template-columns: repeat(2, 1fr); }

  /* Core list */
  .core-item { grid-template-columns: 1fr; gap: 8px; }

  /* Process phases */
  .process-phases { grid-template-columns: 1fr; }

  /* Archflow */
  .archflow { padding: 24px 16px; }
  .archflow-track { grid-template-columns: 1fr; gap: 12px; }
  .arch-node { flex-direction: row; align-items: center; }
  .arch-node-pip { margin: 0; }
  .arch-node-card { flex: 1; flex-direction: row; align-items: center; gap: 12px; }

  /* Value table */
  .vt-row { grid-template-columns: 1fr; gap: 8px; }
}

/* Small mobile */
@media (max-width: 600px) {
  .container { padding: 0 16px; }
  .hero { padding: 72px 16px 48px; }
  .hero-title { font-size: clamp(30px, 11vw, 44px); letter-spacing: -0.04em; }
  .hero-trust { grid-template-columns: 1fr 1fr; gap: 12px; }
  .hero-trust strong { font-size: 18px; }
  .section-head { margin-bottom: 40px; }
  .section-title { font-size: clamp(24px, 7.5vw, 36px); }
  .section-sub { font-size: 15px; }
  .path-card { padding: 20px; }
  .path-card h3 { font-size: 22px; }
  .hmi { padding: 40px 0; }
  .hmi-routes-large .route-card { padding: 20px; }
  .route-card h3 { font-size: 20px; }
  .route-card .spec-row { grid-template-columns: 1fr; gap: 4px; }
  .process-track { gap: 4px; }
  .step { min-width: 60px; padding: 10px 4px; font-size: 11px; }
  .step span { font-size: 10px; }
  .pc-grid { grid-template-columns: 1fr; }
  .hmi-sizes { gap: 24px; }
  .size-screen { max-width: 160px; }
  .smart-spec { grid-template-columns: 1fr; }
  .industry-detail { padding: 24px 16px; }
  .why-item { padding: 24px 20px; }
  .why-item h3 { font-size: 20px; }
  .cta-title { font-size: clamp(26px, 7vw, 38px); }
  .footer-cols { grid-template-columns: 1fr; gap: 24px; }
  .footer-inner { padding-bottom: 40px; }
  .footer { padding-top: 48px; }
  .page-hero { padding: 80px 16px 48px; }
  .page-hero-stats { grid-template-columns: 1fr 1fr; }
  .page-hero-cta { flex-direction: column; align-items: center; }
  .arch, .arch.wide { padding: 0 16px; }
  .arch-step { padding: 14px 16px; }
  .arch-step h5, .arch-step strong { font-size: 15px; }
  .arch-step p { font-size: 11px; }
  .arch-node-card { padding: 16px 12px; }
  .arch-node-card h5 { font-size: 16px; }
  .arch-node-card p { font-size: 12px; }
  .archflow { margin: 40px 16px 0; }
  .archflow-track { padding: 0; }
  .process-timeline { grid-template-columns: repeat(2, 1fr); }
  .tl-strip { flex-wrap: wrap; gap: 12px; }
  .fit-grid { grid-template-columns: 1fr; }
  .fit-card-large { padding: 20px; }
  .industry-meta { grid-template-columns: 1fr; gap: 16px; }
  .modular-grid { grid-template-columns: 1fr; }
  .neutral-grid { grid-template-columns: 1fr; }
  .adapter-grid { grid-template-columns: 1fr; }
  .problem-grid { grid-template-columns: 1fr; }
  .ops-grid { grid-template-columns: 1fr; }
  .btn-primary { padding: 12px 20px; font-size: 14px; }
  .btn-ghost { font-size: 14px; }
  .archflow-legend { flex-direction: column; align-items: flex-start; gap: 10px; }
  .value-table { border-radius: 14px; }
  .vt-row { padding: 16px 20px; }
  .kit-grid { grid-template-columns: 1fr; }
}

/* Extra small */
@media (max-width: 374px) {
  .hero-trust { grid-template-columns: 1fr; }
  .process-timeline { grid-template-columns: 1fr; }
  .page-hero-stats { grid-template-columns: 1fr; }
}