:root {
  --bg: #ffffff;
  --bg-card: #fafafa;
  --bg-nav-scrolled: rgba(255, 255, 255, 0.85);
  --text: #0a0a0f;
  --text-muted: #52525b;
  --text-dim: #a1a1aa;
  --border: #e4e4e7;
  --border-strong: #d4d4d8;
  --accent: #2563eb;
  --accent-soft: #3b82f6;
  --accent-glow: rgba(37, 99, 235, 0.10);
  --accent-glow-strong: rgba(37, 99, 235, 0.18);
  --logo: #2563eb;
  --logo-rim: #93c5fd;
  --safe: #16a34a;
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', 'Fira Code', monospace;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
html, body { height: 100%; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-feature-settings: "ss01", "cv11";
}

a { color: inherit; text-decoration: none; }
img, svg { display: block; max-width: 100%; }

/* ───────── NAV ───────── */
nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  height: 64px;
  padding: 0 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: background 0.25s ease, border-color 0.25s ease;
  background: transparent;
  border-bottom: 1px solid transparent;
}
nav.scrolled {
  background: rgba(255, 255, 255, 0.96);
  border-bottom-color: var(--border);
}
.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  font-size: 15px;
  letter-spacing: -0.01em;
}
.nav-brand svg { width: 24px; height: 24px; }
.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}
.nav-links a {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-muted);
  transition: color 0.2s ease;
}
.nav-links a:hover { color: var(--accent); }
.nav-links a.active { color: var(--text); }
.nav-cta-mobile { display: none; }

/* ───────── SECTIONS ───────── */
section {
  padding: 120px 32px;
  max-width: 1080px;
  margin: 0 auto;
}
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 32px;
}
.eyebrow::before {
  content: '';
  display: inline-block;
  width: 4px;
  height: 14px;
  background: var(--accent);
  border-radius: 2px;
}
.section-intro {
  font-size: 18px;
  line-height: 1.65;
  color: var(--text-muted);
  max-width: 720px;
  margin-bottom: 56px;
}

/* ───────── HERO ───────── */
.hero {
  min-height: 100vh;
  padding-top: 96px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  position: relative;
  overflow: hidden;
  max-width: none;
}
.hero::after {
  content: '';
  position: absolute;
  left: 50%; bottom: 0;
  width: 1px; height: 160px;
  background: linear-gradient(to bottom, var(--accent), rgba(37, 99, 235, 0));
  pointer-events: none;
}
.hero-content {
  position: relative;
  z-index: 1;
  max-width: 720px;
  padding: 0 24px;
}
.hero-logo {
  display: block;
  width: 88px;
  height: 88px;
  margin: 0 auto 40px;
}
.hero h1 {
  font-size: 56px;
  font-weight: 700;
  letter-spacing: -0.035em;
  line-height: 1.05;
  margin-bottom: 28px;
}
.hero h1 .gradient {
  background: linear-gradient(135deg, var(--accent), var(--accent-soft));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-tagline {
  font-size: 19px;
  font-weight: 400;
  line-height: 1.6;
  color: var(--text-muted);
  margin-bottom: 16px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}
.hero-sub {
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.01em;
  color: var(--text-dim);
  margin-bottom: 48px;
  max-width: 540px;
  margin-left: auto;
  margin-right: auto;
}
.hero-ctas {
  display: inline-flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
  justify-content: center;
}
.cta-primary,
.cta-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 15px;
  font-weight: 500;
  padding: 13px 24px;
  border-radius: 8px;
  transition: all 0.2s ease;
  white-space: nowrap;
  font-family: inherit;
  cursor: pointer;
  border: 1px solid transparent;
}
.cta-primary {
  background: var(--accent);
  color: #fff;
}
.cta-primary:hover {
  background: #1d4ed8;
  transform: translateY(-1px);
  box-shadow: 0 6px 20px var(--accent-glow-strong);
}
.cta-secondary {
  color: var(--text);
  border-color: var(--border-strong);
  background: transparent;
}
.cta-secondary:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* ───────── ABOUT ───────── */
.about-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
}
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 28px;
  transition: all 0.25s ease;
}
.card:hover {
  border-color: var(--accent);
  background: #fff;
  transform: translateY(-2px);
  box-shadow: 0 8px 32px var(--accent-glow);
}
.card-icon {
  display: block;
  width: 28px;
  height: 28px;
  margin-bottom: 22px;
  color: var(--text-dim);
  transition: color 0.3s ease, transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}
.card:hover .card-icon {
  color: var(--accent);
  transform: scale(1.08);
}
.card h3 {
  font-size: 18px;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin-bottom: 12px;
}
.card p {
  font-size: 15px;
  line-height: 1.6;
  color: var(--text-muted);
}

/* ───────── APPROACH ───────── */
.principles {
  display: flex;
  flex-direction: column;
  gap: 56px;
}
.principle {
  display: grid;
  grid-template-columns: 112px 1fr;
  gap: 28px;
  align-items: flex-start;
  transition: transform 0.25s ease;
}
.principle:hover {
  transform: translateX(4px);
}
.principle-num {
  font-family: var(--font-mono);
  font-size: 64px;
  font-weight: 400;
  color: var(--accent-soft);
  line-height: 1;
  letter-spacing: -0.02em;
}
.principle-body h3 {
  font-size: 20px;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin-bottom: 10px;
}
.principle-body p {
  font-size: 16px;
  line-height: 1.65;
  color: var(--text-muted);
}
.principle-body p em {
  color: var(--text);
  font-style: italic;
}

/* ───────── CONTACT ───────── */
.contact {
  text-align: left;
  padding-bottom: 160px;
}
.contact-line {
  font-size: 17px;
  color: var(--text-muted);
  margin-bottom: 20px;
}
.contact-mailto {
  display: inline-block;
  font-size: 28px;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--text);
  border-bottom: 1px solid var(--border-strong);
  padding-bottom: 4px;
  transition: all 0.25s ease;
}
.contact-mailto:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

/* ───────── FOOTER ───────── */
footer {
  border-top: 1px solid var(--border);
  padding: 48px 32px;
  text-align: center;
  font-size: 13px;
  color: var(--text-dim);
}
footer .legal-line {
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
  margin-bottom: 8px;
}
footer .dot {
  margin: 0 10px;
  color: var(--border-strong);
}
footer .seg { white-space: nowrap; }
footer .copyright {
  font-size: 12px;
}

/* ───────── LOGO ANIMATIONS ───────── */
.hero-logo .outer { animation: entryOuter 0.9s ease-out both; }
.hero-logo .middle { animation: entryMiddle 0.9s ease-out 0.3s both; }
.hero-logo .inner {
  transform-origin: 22px 22px;
  animation: entryInner 0.9s ease-out 0.55s both;
}
@keyframes entryOuter {
  0% { opacity: 0; transform: scale(1.5); transform-origin: 22px 22px; }
  100% { opacity: 1; transform: scale(1); transform-origin: 22px 22px; }
}
@keyframes entryMiddle {
  0% { opacity: 0; transform: scale(1.4); transform-origin: 22px 22px; }
  100% { opacity: 1; transform: scale(1); transform-origin: 22px 22px; }
}
@keyframes entryInner {
  0% { opacity: 0; transform: scale(0.3); }
  100% { opacity: 1; transform: scale(1); }
}

/* ───────── SCROLL FADE-IN ───────── */
.fade-section {
  opacity: 0;
  transition: opacity 0.5s ease;
}
.fade-section.visible {
  opacity: 1;
}
/* Section header items: fade up together */
.fade-section .eyebrow,
.fade-section .section-intro {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}
.fade-section.visible .eyebrow,
.fade-section.visible .section-intro { opacity: 1; transform: translateY(0); }
.fade-section.visible .section-intro { transition-delay: 0.08s; }

/* Cards stagger reveal */
.fade-section .about-cards .card,
.fade-section .principles .principle,
.fade-section .contact-line,
.fade-section .contact-mailto {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}
.fade-section.visible .about-cards .card,
.fade-section.visible .principles .principle,
.fade-section.visible .contact-line,
.fade-section.visible .contact-mailto {
  opacity: 1;
  transform: translateY(0);
}
.fade-section.visible .about-cards .card:nth-child(1) { transition-delay: 0.16s; }
.fade-section.visible .about-cards .card:nth-child(2) { transition-delay: 0.24s; }
.fade-section.visible .about-cards .card:nth-child(3) { transition-delay: 0.32s; }
.fade-section.visible .about-cards .card:nth-child(4) { transition-delay: 0.40s; }
.fade-section.visible .about-cards .card:nth-child(5) { transition-delay: 0.48s; }
.fade-section.visible .principles .principle:nth-child(1) { transition-delay: 0.16s; }
.fade-section.visible .principles .principle:nth-child(2) { transition-delay: 0.24s; }
.fade-section.visible .principles .principle:nth-child(3) { transition-delay: 0.32s; }
.fade-section.visible .principles .principle:nth-child(4) { transition-delay: 0.40s; }
.fade-section.visible .principles .principle:nth-child(5) { transition-delay: 0.48s; }
.fade-section.visible .contact-line { transition-delay: 0.16s; }
.fade-section.visible .contact-mailto { transition-delay: 0.24s; }

/* ───────── RESPONSIVE ───────── */
@media (max-width: 1023px) {
  section { padding: 96px 24px; }
}
@media (max-width: 767px) {
  nav { padding: 0 20px; }
  .nav-links { display: none; }
  .nav-cta-mobile {
    display: inline-flex;
    align-items: center;
    font-size: 13px;
    font-weight: 500;
    color: var(--accent);
    padding: 8px 14px;
    border: 1px solid var(--border-strong);
    border-radius: 6px;
  }
  .nav-cta-mobile:hover { border-color: var(--accent); }

  section { padding: 72px 24px; }
  .contact { padding-bottom: 96px; }

  .hero { padding-top: 80px; }
  .hero h1 { font-size: 36px; }
  .hero-tagline { font-size: 16px; margin-bottom: 12px; }
  .hero-sub { font-size: 13px; margin-bottom: 36px; }
  .hero-logo { width: 64px; height: 64px; margin-bottom: 28px; }

  .principle {
    grid-template-columns: 1fr;
    gap: 12px;
  }
  .principle-num { font-size: 48px; }

  .contact-mailto { font-size: 20px; }
  .eyebrow { margin-bottom: 24px; }
  .section-intro { font-size: 17px; margin-bottom: 40px; }
}

/* ───────── REDUCED MOTION ───────── */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .hero-logo .outer,
  .hero-logo .middle,
  .hero-logo .inner { animation: none; }
  .fade-section,
  .fade-section .eyebrow,
  .fade-section .section-intro,
  .fade-section .about-cards .card,
  .fade-section .principles .principle,
  .fade-section .contact-line,
  .fade-section .contact-mailto {
    opacity: 1;
    transform: none;
    transition: none;
  }
  .principle:hover,
  .card:hover { transform: none; }
  .card:hover .card-icon { transform: none; }
}

/* ───────── SUBPAGE HEADER ───────── */
.page-header {
  position: relative;
  overflow: hidden;
  max-width: 1080px;
  margin: 0 auto;
  padding: 184px 32px 24px;
}
.page-header > * { position: relative; z-index: 1; }
.page-header h1 {
  font-size: 46px;
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.08;
  max-width: 760px;
  margin-bottom: 22px;
}
.page-header .lede {
  font-size: 19px;
  line-height: 1.6;
  color: var(--text-muted);
  max-width: 640px;
}
.page-header + section { padding-top: 72px; }

/* ───────── WORK GRID (home) ───────── */
.work-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.work-grid .card { padding: 36px; }
.work-grid .card h3 { font-size: 22px; margin-bottom: 14px; }
.work-grid .card p { font-size: 16px; line-height: 1.65; }

/* ───────── PROSE ───────── */
.prose { max-width: 720px; }
.prose p {
  font-size: 17px;
  line-height: 1.72;
  color: var(--text-muted);
  margin-bottom: 22px;
}
.prose p:last-child { margin-bottom: 0; }
.text-link {
  color: var(--accent);
  font-weight: 500;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease;
}
.text-link:hover { border-bottom-color: var(--accent); }

/* ───────── FACTS ───────── */
.facts {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px 40px;
  max-width: 960px;
}
.fact-label {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 8px;
}
.fact-value {
  font-size: 16px;
  font-weight: 500;
  color: var(--text);
  line-height: 1.5;
}

/* ───────── CONTACT PAGE ───────── */
.contact-grid {
  display: grid;
  padding-bottom: 40px;
  grid-template-columns: 1.2fr 1fr;
  gap: 64px;
  align-items: start;
}
.address {
  margin-top: 40px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-muted);
}
.address .lbl {
  display: block;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 8px;
}
.contact-topics { list-style: none; display: flex; flex-direction: column; gap: 22px; }
.contact-topics li {
  position: relative;
  padding-left: 20px;
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-muted);
}
.contact-topics li::before {
  content: '';
  position: absolute;
  left: 0; top: 10px;
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--accent);
}
.contact-topics li strong { color: var(--text); font-weight: 600; }
.topics-label {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 20px;
}
.home-contact { text-align: center; padding-bottom: 160px; }

/* fade-up for new blocks */
.fade-section .work-grid .card,
.fade-section .prose,
.fade-section .facts,
.fade-section .contact-grid {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}
.fade-section.visible .work-grid .card,
.fade-section.visible .prose,
.fade-section.visible .facts,
.fade-section.visible .contact-grid { opacity: 1; transform: translateY(0); }
.fade-section.visible .work-grid .card:nth-child(1) { transition-delay: 0.16s; }
.fade-section.visible .work-grid .card:nth-child(2) { transition-delay: 0.26s; }
.fade-section.visible .prose,
.fade-section.visible .facts,
.fade-section.visible .contact-grid { transition-delay: 0.16s; }

@media (max-width: 767px) {
  .page-header { padding: 128px 24px 8px; }
  .page-header h1 { font-size: 32px; }
  .page-header .lede { font-size: 16px; }
  .page-header + section { padding-top: 48px; }
  .work-grid { grid-template-columns: 1fr; }
  .work-grid .card { padding: 28px 24px; }
  .work-grid .card h3 { font-size: 20px; }
  .prose p { font-size: 16px; }
  .contact-grid { grid-template-columns: 1fr; gap: 48px; }
  .facts { grid-template-columns: 1fr; gap: 24px; }
  .home-contact { padding-bottom: 96px; }
}
@media (prefers-reduced-motion: reduce) {
  .fade-section .work-grid .card,
  .fade-section .prose,
  .fade-section .facts,
  .fade-section .contact-grid { opacity: 1; transform: none; transition: none; }
}

/* ───────── LIGHT FIELD (方向 B,2026-09-05 选定) ───────── */
section.panel {
  background: rgba(243, 246, 252, 0.9);
  border: 1px solid rgba(37, 99, 235, 0.08);
  border-radius: 24px;
  padding: 88px 64px;
  margin: 0 auto 32px;
  max-width: 1080px;
}
.hero + section.panel { margin-top: -24px; }
section.panel:last-of-type { margin-bottom: 96px; }
.page-header + section.panel { padding-top: 88px; margin-top: 40px; }
section.panel .card {
  background: #fff;
  border-color: rgba(37, 99, 235, 0.10);
  border-radius: 18px;
  box-shadow: 0 1px 2px rgba(10, 10, 15, 0.03);
}
.home-contact { padding-top: 96px; }
.contact-mailto { font-size: 32px; }
footer { border-top-color: rgba(37, 99, 235, 0.10); }
@media (max-width: 1023px) {
  section.panel { padding: 72px 40px; margin-left: 24px; margin-right: 24px; }
}
@media (max-width: 767px) {
  section.panel { padding: 56px 24px; border-radius: 18px; margin-left: 12px; margin-right: 12px; }
  .hero::after { height: 96px; }
  .contact-mailto { font-size: 22px; }
}

/* ───────── STAGES (how-we-choose) ───────── */
.work-grid.stages { grid-template-columns: repeat(4, 1fr); gap: 20px; }
.work-grid.stages .card { padding: 28px; }
.work-grid.stages .card h3 { font-size: 19px; margin-bottom: 12px; }
.work-grid.stages .card p { font-size: 15px; }
.fade-section.visible .work-grid .card:nth-child(3) { transition-delay: 0.36s; }
.fade-section.visible .work-grid .card:nth-child(4) { transition-delay: 0.46s; }
@media (max-width: 1023px) { .work-grid.stages { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 767px) { .work-grid.stages { grid-template-columns: 1fr; } }

/* ═══════════ V3 · 质感层(2026-09-05 B+ 定稿) ═══════════ */

/* 光场:三团光晕极慢漂移 */
.light { position: fixed; inset: 0; z-index: -1; pointer-events: none; overflow: hidden; }
.light span { position: absolute; border-radius: 50%; }
.light .l1 { width: 1100px; height: 700px; left: 50%; top: -10%; margin-left: -550px;
  background: radial-gradient(ellipse at center, rgba(37,99,235,.20), rgba(37,99,235,0) 68%); animation: drift1 26s ease-in-out infinite alternate; }
.light .l2 { width: 820px; height: 620px; right: -6%; top: 52%;
  background: radial-gradient(ellipse at center, rgba(59,130,246,.13), rgba(59,130,246,0) 68%); animation: drift2 34s ease-in-out infinite alternate; }
.light .l3 { width: 700px; height: 560px; left: -8%; bottom: -6%;
  background: radial-gradient(ellipse at center, rgba(37,99,235,.10), rgba(37,99,235,0) 68%); animation: drift3 30s ease-in-out infinite alternate; }
@keyframes drift1 { to { transform: translate(60px, 40px) scale(1.06); } }
@keyframes drift2 { to { transform: translate(-80px, -50px) scale(1.08); } }
@keyframes drift3 { to { transform: translate(50px, -40px); } }

/* 首屏:hex 构造线 + 加载时描线 */
.hero { min-height: 92vh; }
.hero::after { height: 200px; }
.hero .geo { position: absolute; left: 50%; top: 50%; width: 1040px; height: 1040px; margin: -560px 0 0 -520px; pointer-events: none; z-index: 0; }
.hero .geo svg { width: 100%; height: 100%; }
.hero .geo path, .hero .geo circle { stroke: #2563eb; fill: none; vector-effect: non-scaling-stroke;
  stroke-dasharray: 1; stroke-dashoffset: 1; animation: draw 1.8s cubic-bezier(.4,0,.2,1) forwards; }
.hero .geo .g1 { animation-delay: .10s; } .hero .geo .g2 { animation-delay: .25s; }
.hero .geo .g3 { animation-delay: .40s; } .hero .geo .g4 { animation-delay: .55s; } .hero .geo .g5 { animation-delay: .70s; }
@keyframes draw { to { stroke-dashoffset: 0; } }
.hero-content { max-width: 860px; }
.hero-logo { width: 76px; height: 76px; margin-bottom: 44px; }
.hero h1 { font-size: 76px; letter-spacing: -0.045em; line-height: 1; margin-bottom: 26px; }
.hero-tagline { font-size: 21px; max-width: 660px; color: #3f3f46; }
.hero-sub { font-size: 13px; letter-spacing: .12em; text-transform: uppercase; color: var(--text-dim); font-weight: 600; }

/* 被光照到的表面 */
section.panel {
  background: linear-gradient(180deg, rgba(255,255,255,.92) 0%, rgba(243,246,252,.92) 100%);
  border: 1px solid rgba(37,99,235,.10);
  box-shadow: inset 0 1px 0 #fff, 0 30px 80px -40px rgba(37,99,235,.22), 0 1px 2px rgba(10,10,15,.03);
  padding: 96px 72px;
}
section.panel .card {
  border: 1px solid rgba(37,99,235,.10);
  box-shadow: inset 0 1px 0 #fff, 0 10px 30px -18px rgba(37,99,235,.25);
  background: linear-gradient(180deg, #fff 0%, #fbfcfe 100%);
}
section.panel .card:hover { transform: translateY(-3px); box-shadow: inset 0 1px 0 #fff, 0 22px 44px -20px rgba(37,99,235,.35); border-color: rgba(37,99,235,.28); }
.cta-primary { background: linear-gradient(180deg, #3b82f6 0%, #2563eb 100%); box-shadow: inset 0 1px 0 rgba(255,255,255,.35), 0 8px 20px -8px rgba(37,99,235,.6); }
.cta-primary:hover { background: linear-gradient(180deg, #2f74f0 0%, #1d4ed8 100%); }
.cta-secondary { background: rgba(255,255,255,.85); box-shadow: inset 0 1px 0 #fff; }

/* 真正的区块标题 */
.h2 { font-size: 40px; font-weight: 700; letter-spacing: -0.03em; line-height: 1.1; max-width: 820px; margin-bottom: 20px; }
.section-intro { font-size: 18px; margin-bottom: 48px; }
.eyebrow { margin-bottom: 22px; }
.page-header h1 { font-size: 56px; letter-spacing: -0.04em; max-width: 880px; }

/* 卡片:大图标 + 一句话 */
.work-grid .card { padding: 40px; }
.work-grid .card .card-icon { width: 44px; height: 44px; margin-bottom: 28px; color: var(--accent); }
.work-grid .card h3 { font-size: 26px; margin-bottom: 12px; }
.work-grid .card p { font-size: 17px; color: var(--text-muted); }
.work-grid .card .text-link { display: inline-block; margin-top: 18px; font-size: 15px; }
.work-grid.three { grid-template-columns: repeat(3, 1fr); }
.work-grid.three .card { padding: 32px; }
.work-grid.three .card h3 { font-size: 21px; }
.work-grid.three .card p { font-size: 15.5px; }
.work-grid.three .card .card-icon { width: 36px; height: 36px; margin-bottom: 22px; }

/* 维度 / 步骤:竖线分栏 */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0; border-top: 1px solid rgba(37,99,235,.14); }
.steps.four { grid-template-columns: repeat(4, 1fr); }
.step { padding: 32px 24px 8px 0; border-right: 1px solid rgba(37,99,235,.14); margin-right: 24px; }
.step:last-child { border-right: 0; margin-right: 0; }
.step .ico { width: 28px; height: 28px; color: var(--accent); margin-bottom: 18px; display: block; }
.step h3 { font-size: 20px; font-weight: 600; letter-spacing: -0.01em; margin-bottom: 8px; }
.step p { font-size: 15px; line-height: 1.55; color: var(--text-muted); }

/* 五条承诺:紧凑网格 */
.commit-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.commit { background: linear-gradient(180deg,#fff,#fbfcfe); border: 1px solid rgba(37,99,235,.10); border-radius: 16px; padding: 28px;
  box-shadow: inset 0 1px 0 #fff, 0 10px 30px -18px rgba(37,99,235,.25); transition: all .25s ease; }
.commit:hover { transform: translateY(-3px); border-color: rgba(37,99,235,.28); }
.commit .ico { width: 30px; height: 30px; color: var(--accent); margin-bottom: 20px; display: block; }
.commit h3 { font-size: 18px; font-weight: 600; letter-spacing: -0.01em; margin-bottom: 8px; }
.commit p { font-size: 15px; line-height: 1.55; color: var(--text-muted); }

/* 事实栏加图标 */
.facts .ico { width: 26px; height: 26px; color: var(--accent); margin-bottom: 14px; display: block; }
.facts { gap: 36px 40px; }

/* 两栏:文字 + 插画 */
.split { display: grid; grid-template-columns: 1.05fr 1fr; gap: 64px; align-items: center; }
.illus { width: 100%; height: auto; display: block; }
.illus .grid-dot { fill: rgba(37,99,235,.14); }
.illus .shore { fill: #2563eb; }
.illus .arc { stroke: #2563eb; stroke-opacity: .55; fill: none; stroke-width: 1.5; stroke-dasharray: 1; stroke-dashoffset: 1; }
.illus .arc.dash { stroke-dasharray: 1; }
.fade-section.visible .illus .arc { animation: draw 2.2s cubic-bezier(.4,0,.2,1) .3s forwards; }
.illus .halo { fill: none; stroke: #2563eb; stroke-opacity: .18; }

/* 写信三件事 */
.three-things { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin: 36px 0 32px; }
.thing { border: 1px solid rgba(37,99,235,.12); border-radius: 14px; padding: 22px 24px; background: rgba(255,255,255,.7); }
.thing .n { font-family: var(--font-mono); font-size: 12px; color: var(--accent); letter-spacing: .08em; margin-bottom: 10px; }
.thing h4 { font-size: 16px; font-weight: 600; margin-bottom: 4px; }
.thing p { font-size: 14px; color: var(--text-muted); line-height: 1.5; }

/* 不做清单 */
.not-list { list-style: none; display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.not-list li { position: relative; padding: 20px 22px 20px 46px; border: 1px solid rgba(37,99,235,.12); border-radius: 14px; font-size: 15px; color: var(--text-muted); line-height: 1.5; background: rgba(255,255,255,.7); }
.not-list li::before { content: ''; position: absolute; left: 20px; top: 26px; width: 12px; height: 1.5px; background: var(--accent); }

/* 联系页主题图标 */
.contact-topics li { padding-left: 44px; }
.contact-topics li::before { display: none; }
.contact-topics .ico { position: absolute; left: 0; top: 0; width: 26px; height: 26px; color: var(--accent); }
.home-contact .contact-mailto { font-size: 36px; }

/* 图标通用 */
.ico, .card-icon { stroke: currentColor; fill: none; stroke-width: 1.4; stroke-linecap: round; stroke-linejoin: round; }

@media (max-width: 1023px) {
  .commit-grid, .work-grid.three, .three-things, .not-list { grid-template-columns: repeat(2, 1fr); }
  .steps.four { grid-template-columns: repeat(2, 1fr); }
  .steps.four .step:nth-child(2) { border-right: 0; }
  .split { grid-template-columns: 1fr; gap: 40px; }
}
@media (max-width: 767px) {
  .hero h1 { font-size: 44px; }
  .hero .geo { width: 640px; height: 640px; margin: -360px 0 0 -320px; }
  .h2 { font-size: 30px; }
  .page-header h1 { font-size: 36px; }
  section.panel { padding: 56px 24px; }
  .steps, .steps.four { grid-template-columns: 1fr; }
  .step { border-right: 0; margin-right: 0; border-bottom: 1px solid rgba(37,99,235,.14); padding: 24px 0; }
  .step:last-child { border-bottom: 0; }
  .commit-grid, .work-grid.three, .three-things, .not-list { grid-template-columns: 1fr; }
  .work-grid .card { padding: 28px 24px; }
  .work-grid .card h3 { font-size: 22px; }
  .home-contact .contact-mailto { font-size: 22px; }
}
@media (prefers-reduced-motion: reduce) {
  .light span { animation: none; }
  .hero .geo path, .hero .geo circle, .illus .arc { animation: none; stroke-dashoffset: 0; }
  .commit:hover { transform: none; }
}