/* ===================== TOKENS ===================== */
:root {
  --color-bg: #F5F6F2;
  --color-surface: #FFFFFF;
  --color-ink: #0E1B2E;
  --color-ink-soft: #4A5568;
  --color-ink-faint: #7C8798;
  --color-accent-copper: #BE6E2E;
  --color-accent-copper-soft: #E9CBAA;
  --color-accent-teal: #10787A;
  --color-accent-teal-soft: #CDE7E6;
  --color-line: #E1E2DB;
  --color-line-strong: #C8CAC1;

  --font-display: 'Space Grotesk', 'Noto Sans SC', sans-serif;
  --font-body: 'Noto Sans SC', 'Space Grotesk', sans-serif;
  --font-mono: 'IBM Plex Mono', monospace;

  --container: 1160px;
  --radius: 3px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; }
}

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-ink);
  font-family: var(--font-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
h1, h2, h3, h4 { margin: 0; font-family: var(--font-display); font-weight: 600; letter-spacing: -0.01em; }
p { margin: 0; }
ul { margin: 0; padding: 0; list-style: none; }
:focus-visible { outline: 2px solid var(--color-accent-teal); outline-offset: 3px; }

.section-inner, .nav-inner, .hero-inner, .footer-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 32px;
}

/* ===================== NAV ===================== */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(245, 246, 242, 0.9);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-line);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}
.brand { display: flex; align-items: center; gap: 10px; }
.brand-mark { width: 28px; height: 28px; color: var(--color-accent-copper); flex-shrink: 0; }
.brand-text { display: flex; flex-direction: column; line-height: 1.15; }
.brand-zh { font-family: var(--font-display); font-weight: 700; font-size: 17px; }
.brand-en { font-family: var(--font-mono); font-size: 9.5px; letter-spacing: 0.14em; color: var(--color-ink-faint); }

.nav-links { display: flex; gap: 30px; font-size: 14.5px; }
.nav-links a { color: var(--color-ink-soft); transition: color 0.15s; position: relative; }
.nav-links a:hover { color: var(--color-ink); }

.nav-actions { display: flex; align-items: center; gap: 16px; }
.lang-toggle {
  font-family: var(--font-mono);
  font-size: 12.5px;
  background: var(--color-surface);
  border: 1px solid var(--color-line-strong);
  border-radius: 20px;
  padding: 6px 12px;
  cursor: pointer;
  display: flex; align-items: center; gap: 5px;
  color: var(--color-ink-soft);
}
.lang-opt { padding: 1px 2px; }
.lang-opt.active { color: var(--color-accent-copper); font-weight: 700; }
.lang-sep { color: var(--color-line-strong); }

.menu-btn { display: none; flex-direction: column; gap: 4px; background: none; border: none; cursor: pointer; padding: 8px; }
.menu-btn span { width: 20px; height: 1.6px; background: var(--color-ink); display: block; }

/* ===================== HERO ===================== */
.hero {
  position: relative;
  padding: 96px 0 64px;
  overflow: hidden;
}
.hero-traces {
  position: absolute;
  inset: 0;
  width: 100%; height: 100%;
  color: var(--color-line-strong);
  opacity: 0.7;
  pointer-events: none;
}
.hero-inner { position: relative; z-index: 1; }
.hero-grid { display: grid; grid-template-columns: 1.15fr 0.85fr; gap: 56px; align-items: center; }
.hero-text { max-width: 640px; }
.hero-media {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--color-line-strong);
  aspect-ratio: 4 / 5;
}
.hero-media img { width: 100%; height: 100%; object-fit: cover; display: block; }
.hero-media::after {
  content: '';
  position: absolute; inset: 0;
  background: linear-gradient(200deg, rgba(14,27,46,0) 45%, rgba(14,27,46,0.28) 100%);
}
.eyebrow {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--color-accent-teal);
  text-transform: uppercase;
  margin-bottom: 18px;
}
.hero h1 {
  font-size: clamp(30px, 4.2vw, 46px);
  line-height: 1.28;
  margin-bottom: 20px;
  color: var(--color-ink);
}
.hero-sub {
  font-size: 16.5px;
  color: var(--color-ink-soft);
  max-width: 560px;
  margin-bottom: 34px;
}
.hero-cta { display: flex; gap: 14px; margin-bottom: 56px; flex-wrap: wrap; }

.btn {
  display: inline-flex;
  align-items: center;
  padding: 13px 26px;
  font-size: 14.5px;
  font-weight: 500;
  border-radius: var(--radius);
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.15s, background 0.15s, border-color 0.15s;
}
.btn-primary { background: var(--color-ink); color: #fff; }
.btn-primary:hover { background: var(--color-accent-copper); transform: translateY(-1px); }
.btn-ghost { border-color: var(--color-line-strong); color: var(--color-ink); }
.btn-ghost:hover { border-color: var(--color-ink); }

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, auto);
  gap: 40px;
  margin: 0;
  padding-top: 32px;
  border-top: 1px solid var(--color-line);
}
.hero-stats dt { font-family: var(--font-mono); font-size: 22px; font-weight: 500; color: var(--color-accent-copper); }
.hero-stats dd { margin: 4px 0 0; font-size: 12.5px; color: var(--color-ink-faint); }

/* ===================== TRUST STRIP ===================== */
.trust-strip { background: var(--color-ink); overflow: hidden; }
.trust-strip-inner {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 14px 18px;
  padding-top: 18px;
  padding-bottom: 18px;
}
.trust-item { font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.02em; color: #C4CAD6; white-space: nowrap; }
.trust-dot { width: 4px; height: 4px; border-radius: 50%; background: var(--color-accent-copper); flex-shrink: 0; }

/* ===================== SECTION SHARED ===================== */
.section { padding: 88px 0; }
.section-alt { background: var(--color-surface); border-top: 1px solid var(--color-line); border-bottom: 1px solid var(--color-line); }
.kicker {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-accent-copper);
  margin-bottom: 14px;
}
.section h2 { font-size: clamp(24px, 3vw, 32px); max-width: 640px; margin-bottom: 44px; }

/* ===================== ABOUT ===================== */
.about-grid { display: grid; grid-template-columns: 1.3fr 1fr; gap: 64px; align-items: start; }
.about-text h2 { margin-bottom: 22px; }
.about-text p { color: var(--color-ink-soft); margin-bottom: 18px; font-size: 15px; }
.about-trace-panel {
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 28px;
}
.about-trace-panel svg { width: 100%; height: auto; display: block; }
.about-photo { border-radius: calc(var(--radius) - 4px); overflow: hidden; margin-bottom: 20px; aspect-ratio: 16 / 10; }
.about-photo img { width: 100%; height: 100%; object-fit: cover; display: block; }
.about-mini-stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin-top: 20px; border-top: 1px solid var(--color-line); padding-top: 20px; }
.about-mini-stats span { display: block; font-family: var(--font-mono); font-size: 16px; color: var(--color-accent-teal); font-weight: 500; }
.about-mini-stats small { color: var(--color-ink-faint); font-size: 11.5px; }

/* ===================== TIMELINE ===================== */
.timeline {
  margin: 56px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 20px;
  position: relative;
}
.timeline::before {
  content: '';
  position: absolute;
  top: 6px; left: 0; right: 0;
  height: 1px;
  background: var(--color-line-strong);
}
.timeline-item { position: relative; padding-top: 24px; }
.timeline-dot {
  position: absolute; top: 0; left: 0;
  width: 12px; height: 12px; border-radius: 50%;
  background: var(--color-bg); border: 2.5px solid var(--color-accent-teal);
}
.timeline-year { display: block; font-family: var(--font-mono); font-size: 15px; color: var(--color-accent-copper); font-weight: 500; margin-bottom: 8px; }
.timeline-item p { font-size: 13px; color: var(--color-ink-soft); }

/* ===================== WHY US ===================== */
.why-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.why-card { background: var(--color-surface); border: 1px solid var(--color-line); border-radius: var(--radius); padding: 26px; }
.why-num { font-family: var(--font-mono); font-size: 13px; color: var(--color-accent-teal); }
.why-card h3 { font-size: 16px; margin: 14px 0 10px; }
.why-card p { font-size: 13.5px; color: var(--color-ink-soft); }

/* ===================== CAPABILITIES ===================== */
.cap-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; }
.cap-card {
  background: var(--color-bg);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 34px;
}
.cap-media { border-radius: calc(var(--radius) - 4px); overflow: hidden; aspect-ratio: 16 / 9; margin-bottom: 24px; }
.cap-media img { width: 100%; height: 100%; object-fit: cover; display: block; }
.cap-icon { width: 44px; height: 44px; color: var(--color-accent-copper); margin-bottom: 20px; }
.cap-card h3 { font-size: 20px; margin-bottom: 12px; }
.cap-card > p { color: var(--color-ink-soft); font-size: 14.5px; margin-bottom: 20px; }
.cap-list li {
  font-size: 13.5px;
  color: var(--color-ink-soft);
  padding: 10px 0 10px 18px;
  border-top: 1px solid var(--color-line);
  position: relative;
}
.cap-list li::before {
  content: '';
  position: absolute; left: 0; top: 18px;
  width: 6px; height: 1.4px; background: var(--color-accent-teal);
}

/* ===================== SOLUTIONS ===================== */
.sol-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.sol-card {
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 28px;
  transition: border-color 0.15s, transform 0.15s;
}
.sol-card:hover { border-color: var(--color-accent-teal); transform: translateY(-2px); }
.sol-icon { width: 30px; height: 30px; color: var(--color-accent-teal); margin-bottom: 18px; }
.sol-card h3 { font-size: 16.5px; margin-bottom: 10px; }
.sol-card p { font-size: 13.5px; color: var(--color-ink-soft); }

/* ===================== CASE STUDIES ===================== */
.case-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.case-card { background: var(--color-surface); border: 1px solid var(--color-line); border-radius: var(--radius); overflow: hidden; }
.case-media { aspect-ratio: 16 / 10; }
.case-media img { width: 100%; height: 100%; object-fit: cover; display: block; }
.case-body { padding: 24px 28px 28px; }
.case-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--color-accent-teal);
  background: var(--color-accent-teal-soft);
  border-radius: 20px;
  padding: 4px 12px;
  margin-bottom: 16px;
}
.case-card h3 { font-size: 16.5px; margin-bottom: 10px; }
.case-card p { font-size: 13.5px; color: var(--color-ink-soft); }

/* ===================== PROCESS ===================== */
.process-track { position: relative; padding-top: 8px; }
.process-line { position: absolute; top: 8px; left: 0; width: 100%; height: 4px; color: var(--color-line-strong); }
.process-steps { display: grid; grid-template-columns: repeat(6, 1fr); gap: 16px; position: relative; }
.process-step { padding-top: 26px; position: relative; }
.step-dot {
  position: absolute; top: 0; left: 0;
  width: 11px; height: 11px; border-radius: 50%;
  background: var(--color-bg); border: 2.5px solid var(--color-accent-copper);
}
.process-step h4 { font-size: 14.5px; margin-bottom: 8px; }
.process-step p { font-size: 12.5px; color: var(--color-ink-soft); }

/* ===================== INDUSTRIES ===================== */
.ind-grid { display: flex; flex-wrap: wrap; gap: 14px; }
.ind-tag {
  font-family: var(--font-mono);
  font-size: 13.5px;
  padding: 12px 22px;
  border: 1px solid var(--color-line-strong);
  border-radius: 20px;
  color: var(--color-ink-soft);
  background: var(--color-surface);
}

/* ===================== CERTIFICATIONS ===================== */
.cert-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.cert-item { text-align: center; border: 1px solid var(--color-line); border-radius: var(--radius); padding: 26px 16px; background: var(--color-surface); }
.cert-badge { display: inline-block; font-family: var(--font-mono); font-weight: 600; font-size: 14px; color: var(--color-accent-copper); border: 1px solid var(--color-accent-copper-soft); border-radius: var(--radius); padding: 6px 14px; margin-bottom: 12px; }
.cert-item p { font-size: 12.5px; color: var(--color-ink-soft); }

/* ===================== FAQ ===================== */
.faq-list { display: flex; flex-direction: column; gap: 12px; max-width: 760px; }
.faq-item { background: var(--color-surface); border: 1px solid var(--color-line); border-radius: var(--radius); padding: 18px 22px; }
.faq-item summary { cursor: pointer; font-size: 15px; font-weight: 500; list-style: none; display: flex; justify-content: space-between; align-items: center; gap: 12px; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: '+'; font-family: var(--font-mono); font-size: 18px; color: var(--color-accent-copper); flex-shrink: 0; transition: transform 0.15s; }
.faq-item[open] summary::after { content: '–'; }
.faq-item p { margin-top: 14px; font-size: 13.5px; color: var(--color-ink-soft); line-height: 1.7; }

/* ===================== CONTACT ===================== */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 64px; }
.contact-desc { color: var(--color-ink-soft); font-size: 15px; margin: 18px 0 32px; max-width: 420px; }
.contact-list div { display: flex; justify-content: space-between; padding: 16px 0; border-top: 1px solid var(--color-line); gap: 20px; }
.contact-list dt { color: var(--color-ink-faint); font-size: 13px; flex-shrink: 0; }
.contact-list dd { margin: 0; font-size: 14px; text-align: right; }

.contact-form {
  background: var(--color-bg);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 32px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}
.contact-form label { font-size: 13px; color: var(--color-ink-soft); display: flex; flex-direction: column; gap: 6px; }
.contact-form input, .contact-form textarea {
  font-family: var(--font-body);
  font-size: 14px;
  padding: 11px 13px;
  border: 1px solid var(--color-line-strong);
  border-radius: var(--radius);
  background: var(--color-surface);
  color: var(--color-ink);
  resize: vertical;
}
.contact-form input:focus, .contact-form textarea:focus { border-color: var(--color-accent-teal); }
.form-note { font-size: 11.5px; color: var(--color-ink-faint); margin-top: -6px; }

/* ===================== FOOTER ===================== */
.footer { background: var(--color-ink); color: #C4CAD6; padding: 56px 0 32px; }
.footer-inner { display: grid; grid-template-columns: 1.3fr 1fr 1fr; gap: 32px; align-items: start; }
.footer-brand .brand-zh { color: #fff; display: block; font-size: 18px; }
.footer-brand .brand-en { font-family: var(--font-mono); font-size: 10px; letter-spacing: 0.14em; color: #6E7A8C; }
.footer-brand p { margin-top: 10px; font-size: 13px; color: #8791A0; }
.footer-links { display: flex; flex-direction: column; gap: 10px; font-size: 13.5px; }
.footer-links a:hover { color: #fff; }
.footer-copy { font-family: var(--font-mono); font-size: 11.5px; color: #6E7A8C; grid-column: 1 / -1; margin-top: 24px; padding-top: 24px; border-top: 1px solid #26324A; }

/* ===================== RESPONSIVE ===================== */
@media (max-width: 900px) {
  .nav-links { display: none; }
  .menu-btn { display: flex; }
  .about-grid, .contact-grid, .cap-grid { grid-template-columns: 1fr; }
  .sol-grid, .why-grid, .case-grid, .cert-grid { grid-template-columns: repeat(2, 1fr); }
  .process-steps { grid-template-columns: repeat(3, 1fr); row-gap: 32px; }
  .process-line { display: none; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); row-gap: 24px; }
  .hero-grid { grid-template-columns: 1fr; }
  .hero-media { order: -1; aspect-ratio: 16 / 9; }
  .footer-inner { grid-template-columns: 1fr; }
  .timeline { grid-template-columns: repeat(3, 1fr); row-gap: 28px; }
  .timeline::before { display: none; }
}
@media (max-width: 560px) {
  .section-inner, .nav-inner, .hero-inner, .footer-inner { padding: 0 20px; }
  .hero { padding: 64px 0 48px; }
  .sol-grid, .why-grid, .case-grid, .cert-grid { grid-template-columns: 1fr; }
  .process-steps { grid-template-columns: repeat(2, 1fr); }
  .hero-cta { flex-direction: column; align-items: stretch; }
  .hero-cta .btn { justify-content: center; }
  .timeline { grid-template-columns: repeat(2, 1fr); }
  .trust-strip-inner { justify-content: center; text-align: center; }
}

/* Mobile nav drawer */
.nav.menu-open .nav-links {
  display: flex;
  position: absolute;
  top: 72px; left: 0; right: 0;
  flex-direction: column;
  background: var(--color-surface);
  padding: 20px 32px 28px;
  border-bottom: 1px solid var(--color-line);
  gap: 18px;
}