:root {
  --bg: #f4f7fc;
  --bg-alt: #eef3fb;
  --surface: #ffffff;
  --text: #1a2744;
  --text-muted: #6b7c93;
  --border: #e4eaf4;
  --border-light: #f0f4fa;
  --primary: #4b7bf5;
  --primary-dark: #3a6ae8;
  --primary-soft: #e8efff;
  --accent: #38bdf8;
  --accent-soft: #e0f6ff;
  --warm: #fff7ed;
  --gradient: linear-gradient(135deg, #4b7bf5 0%, #38bdf8 55%, #7dd3fc 100%);
  --gradient-soft: linear-gradient(135deg, #eef4ff 0%, #f0f9ff 50%, #fafcff 100%);
  --gradient-warm: linear-gradient(135deg, #fff7ed 0%, #fef3f2 100%);
  --shadow-xs: 0 2px 8px rgba(75, 123, 245, 0.06);
  --shadow: 0 8px 32px rgba(75, 123, 245, 0.08);
  --shadow-lg: 0 20px 60px rgba(75, 123, 245, 0.12);
  --shadow-card: 0 4px 24px rgba(26, 39, 68, 0.05);
  --radius: 20px;
  --radius-sm: 14px;
  --nav-h: 76px;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

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

.container {
  width: min(1140px, 92vw);
  margin: 0 auto;
}

/* ── Nav ── */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-h);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(20px) saturate(1.4);
  border-bottom: 1px solid rgba(228, 234, 244, 0.8);
  transition: box-shadow 0.35s, background 0.35s;
}

.nav.scrolled {
  box-shadow: var(--shadow-xs);
  background: rgba(255, 255, 255, 0.97);
}

.nav-inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.logo img { height: 38px; width: auto; }

.nav-links {
  display: flex;
  align-items: center;
  gap: 6px;
  list-style: none;
}

.nav-links a {
  font-size: 0.88rem;
  color: var(--text-muted);
  padding: 8px 14px;
  border-radius: 999px;
  transition: color 0.2s, background 0.2s;
}

.nav-links a:hover {
  color: var(--primary);
  background: var(--primary-soft);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 26px;
  border-radius: 999px;
  font-size: 0.9rem;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: transform 0.25s, box-shadow 0.25s, background 0.25s;
}

.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0); }

.btn-primary {
  background: var(--gradient);
  color: #fff;
  box-shadow: 0 6px 20px rgba(75, 123, 245, 0.3);
}

.btn-primary:hover {
  box-shadow: 0 10px 28px rgba(75, 123, 245, 0.38);
}

.btn-outline {
  background: var(--surface);
  color: var(--text);
  border: 1.5px solid var(--border);
  box-shadow: var(--shadow-xs);
}

.btn-outline:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: var(--primary-soft);
}

.nav-toggle {
  display: none;
  background: var(--primary-soft);
  border: none;
  border-radius: 12px;
  cursor: pointer;
  padding: 10px;
}

.nav-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--primary);
  margin: 4px 0;
  border-radius: 2px;
  transition: 0.3s;
}

/* ── Hero ── */
.hero {
  padding: calc(var(--nav-h) + 64px) 0 88px;
  position: relative;
  overflow: hidden;
  background: var(--gradient-soft);
}

.hero-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
}

.hero-bg .orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(60px);
}

.hero-bg .orb-1 {
  width: 480px;
  height: 480px;
  background: rgba(75, 123, 245, 0.18);
  top: -120px;
  right: -80px;
}

.hero-bg .orb-2 {
  width: 360px;
  height: 360px;
  background: rgba(56, 189, 248, 0.15);
  bottom: -80px;
  left: -60px;
}

.hero-bg .orb-3 {
  width: 200px;
  height: 200px;
  background: rgba(125, 211, 252, 0.2);
  top: 40%;
  left: 45%;
}

.hero-bg .grid-dots {
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle, rgba(75, 123, 245, 0.12) 1px, transparent 1px);
  background-size: 28px 28px;
  mask-image: linear-gradient(180deg, rgba(0,0,0,0.5) 0%, transparent 80%);
}

.hero-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
  position: relative;
  z-index: 1;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 18px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 0.84rem;
  color: var(--primary);
  font-weight: 500;
  margin-bottom: 28px;
  box-shadow: var(--shadow-xs);
}

.hero-badge::before {
  content: "";
  width: 7px;
  height: 7px;
  background: var(--gradient);
  border-radius: 50%;
  animation: pulse 2s ease infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.6; transform: scale(0.85); }
}

.hero h1 {
  font-size: clamp(2.3rem, 4.8vw, 3.6rem);
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: -0.03em;
  margin-bottom: 24px;
}

.hero h1 .gradient-text {
  background: var(--gradient);
  background-size: 200% auto;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: shimmer 4s linear infinite;
}

.hero-desc {
  font-size: 1.1rem;
  color: var(--text-muted);
  max-width: 500px;
  margin-bottom: 36px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 48px;
}

.hero-stats {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.stat-item {
  flex: 1;
  min-width: 120px;
  padding: 20px 22px;
  background: var(--surface);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-card);
  transition: transform 0.3s, box-shadow 0.3s;
}

.stat-item:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow);
}

.stat-num {
  font-size: 1.85rem;
  font-weight: 800;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
}

.stat-label {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* Hero visual */
.hero-visual {
  position: relative;
  height: 420px;
}

.hero-card {
  position: absolute;
  background: var(--surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  padding: 20px 24px;
  box-shadow: var(--shadow);
  display: flex;
  align-items: center;
  gap: 14px;
  transition: transform 0.4s ease;
}

.hero-card:hover { transform: translateY(-4px) !important; }

.hero-card .card-icon {
  width: 48px;
  height: 48px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  flex-shrink: 0;
}

.hero-card .card-icon.blue { background: var(--primary-soft); }
.hero-card .card-icon.cyan { background: var(--accent-soft); }
.hero-card .card-icon.warm { background: #fff0e6; }
.hero-card .card-icon.green { background: #ecfdf5; }

.hero-card strong {
  display: block;
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 2px;
}

.hero-card span {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.hero-card.c1 { top: 20px; left: 0; animation: float 6s ease-in-out infinite; }
.hero-card.c2 { top: 100px; right: 0; animation: float 6s ease-in-out 1s infinite; }
.hero-card.c3 { bottom: 100px; left: 20px; animation: float 6s ease-in-out 2s infinite; }
.hero-card.c4 { bottom: 20px; right: 30px; animation: float 6s ease-in-out 0.5s infinite; }

.hero-center-badge {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 120px;
  height: 120px;
  background: var(--surface);
  border-radius: 50%;
  border: 3px solid var(--border-light);
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 2;
}

.hero-center-badge img { width: 56px; height: 56px; }

.hero-center-badge span {
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--primary);
  margin-top: 4px;
  letter-spacing: 0.05em;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

/* ── Sections ── */
section { padding: 96px 0; }

.section-header {
  text-align: center;
  margin-bottom: 56px;
}

.section-header .section-desc {
  margin-left: auto;
  margin-right: auto;
}

.section-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--primary);
  margin-bottom: 14px;
  padding: 6px 16px;
  background: var(--primary-soft);
  border-radius: 999px;
}

.section-title {
  font-size: clamp(1.85rem, 3.2vw, 2.6rem);
  font-weight: 800;
  line-height: 1.28;
  letter-spacing: -0.025em;
  margin-bottom: 16px;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 580px;
  line-height: 1.8;
}

/* ── Pain ── */
.pain { background: var(--surface); }

.pain-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.pain-card {
  padding: 36px 32px;
  border-radius: var(--radius);
  border: 1px solid var(--border-light);
  background: var(--bg);
  transition: transform 0.35s, box-shadow 0.35s, border-color 0.35s;
  position: relative;
  overflow: hidden;
}

.pain-card::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--gradient);
  opacity: 0;
  transition: opacity 0.35s;
}

.pain-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(75, 123, 245, 0.15);
}

.pain-card:hover::after { opacity: 1; }

.pain-icon-wrap {
  width: 56px;
  height: 56px;
  border-radius: 16px;
  background: var(--surface);
  border: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  margin-bottom: 20px;
  box-shadow: var(--shadow-xs);
}

.pain-card h3 {
  font-size: 1.12rem;
  font-weight: 700;
  margin-bottom: 12px;
  line-height: 1.45;
}

.pain-card p {
  font-size: 0.93rem;
  color: var(--text-muted);
}

/* ── Services ── */
#services { background: var(--bg); }

.services-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 22px;
}

.service-card {
  padding: 36px 32px;
  background: var(--surface);
  border-radius: var(--radius);
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-card);
  transition: transform 0.35s, box-shadow 0.35s;
  position: relative;
  overflow: hidden;
  will-change: transform;
}

.service-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--gradient);
  opacity: 0;
  transition: opacity 0.35s;
}

.service-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

.service-card:hover::before { opacity: 1; }

.service-num {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--primary);
  letter-spacing: 0.06em;
  margin-bottom: 14px;
  padding: 4px 12px;
  background: var(--primary-soft);
  border-radius: 999px;
}

.service-card h3 {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 10px;
  letter-spacing: -0.01em;
}

.service-card p {
  font-size: 0.93rem;
  color: var(--text-muted);
  margin-bottom: 18px;
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag {
  padding: 6px 14px;
  background: var(--bg);
  color: var(--primary);
  border: 1px solid var(--border-light);
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 500;
  transition: background 0.2s;
}

.tag:hover {
  background: var(--primary-soft);
}

/* ── Process ── */
.process { background: var(--surface); }

.process-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  position: relative;
}

.step {
  text-align: center;
  padding: 32px 20px;
  background: var(--bg);
  border-radius: var(--radius);
  border: 1px solid var(--border-light);
  transition: transform 0.35s, box-shadow 0.35s;
  position: relative;
}

.step:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.step-num {
  width: 56px;
  height: 56px;
  margin: 0 auto 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--gradient);
  border-radius: 16px;
  font-size: 1.3rem;
  font-weight: 800;
  color: #fff;
  box-shadow: 0 6px 16px rgba(75, 123, 245, 0.25);
}

.step h4 {
  font-size: 1.02rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.step p {
  font-size: 0.86rem;
  color: var(--text-muted);
  line-height: 1.65;
}

/* ── Cases ── */
.cases { background: var(--bg); }

.cases-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 22px;
}

.case-card {
  padding: 36px 32px;
  border-radius: var(--radius);
  border: 1px solid var(--border-light);
  background: var(--surface);
  box-shadow: var(--shadow-card);
  transition: transform 0.35s, box-shadow 0.35s;
}

.case-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

.case-type {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  background: var(--primary-soft);
  color: var(--primary);
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 600;
  margin-bottom: 18px;
}

.case-card h3 {
  font-size: 1.22rem;
  font-weight: 700;
  margin-bottom: 12px;
  line-height: 1.4;
  letter-spacing: -0.01em;
}

.case-card p {
  font-size: 0.92rem;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.case-metrics {
  display: flex;
  gap: 28px;
  padding-top: 20px;
  border-top: 1px solid var(--border-light);
}

.metric strong {
  display: block;
  font-size: 1.35rem;
  font-weight: 800;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.metric span {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* ── Advantages ── */
#advantages { background: var(--surface); }

.adv-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.adv-card {
  padding: 36px 24px;
  text-align: center;
  background: var(--bg);
  border-radius: var(--radius);
  border: 1px solid var(--border-light);
  transition: transform 0.35s, box-shadow 0.35s, background 0.35s;
}

.adv-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow);
  background: var(--surface);
}

.adv-icon-wrap {
  width: 64px;
  height: 64px;
  margin: 0 auto 18px;
  border-radius: 20px;
  background: var(--surface);
  border: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  box-shadow: var(--shadow-xs);
}

.adv-card h4 {
  font-size: 1.02rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.adv-card p {
  font-size: 0.87rem;
  color: var(--text-muted);
  line-height: 1.65;
}

/* ── Contact ── */
.contact {
  background: #f8fafc;
  text-align: center;
  position: relative;
}

.contact-box {
  max-width: 720px;
  margin: 0 auto;
  padding: 48px 40px;
  background: #ffffff;
  border-radius: var(--radius);
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow);
}

.contact-box .section-title {
  color: var(--text);
}

.contact-box .section-desc {
  color: var(--text-muted);
  margin-left: auto;
  margin-right: auto;
}

.contact-box .section-label {
  background: var(--primary-soft);
  border: none;
  color: var(--primary);
}

.contact-cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-top: 36px;
}

.contact-card {
  padding: 32px 28px;
  background: #f8fafc;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  transition: transform 0.3s, box-shadow 0.3s, background 0.3s;
}

.contact-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow);
  background: var(--primary-soft);
}

.contact-card .icon-wrap {
  width: 56px;
  height: 56px;
  margin: 0 auto 14px;
  background: var(--surface);
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-xs);
}

.contact-card h4 {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 8px;
  font-weight: 500;
}

.contact-card a,
.contact-card p {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text);
}

.contact-card a:hover { color: var(--primary); }

/* ── Footer ── */
.footer {
  background: var(--surface);
  color: var(--text-muted);
  padding: 40px 0 32px;
  font-size: 0.86rem;
  border-top: 1px solid var(--border-light);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-logo img { height: 30px; width: auto; }

.footer a {
  color: var(--text-muted);
  transition: color 0.2s;
}

.footer a:hover { color: var(--primary); }

.footer-copy {
  text-align: center;
  margin-top: 24px;
  padding-top: 24px;
  border-top: 1px solid var(--border-light);
  font-size: 0.8rem;
  color: #94a3b8;
}

/* ── Animations ── */
.fade-up,
.fade-left,
.fade-right,
.scale-in {
  opacity: 0;
  transition:
    opacity 0.7s cubic-bezier(0.22, 1, 0.36, 1),
    transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
}

.fade-up    { transform: translateY(32px); }
.fade-left  { transform: translateX(-32px); }
.fade-right { transform: translateX(32px); }
.scale-in   { transform: scale(0.92); }

.fade-up.visible,
.fade-left.visible,
.fade-right.visible,
.scale-in.visible {
  opacity: 1;
  transform: translate(0) scale(1);
}

/* Hero 首屏入场 */
.hero .hero-badge  { transition-delay: 0.1s; }
.hero h1           { transition-delay: 0.2s; }
.hero .hero-desc   { transition-delay: 0.35s; }
.hero .hero-actions { transition-delay: 0.5s; }
.hero .hero-stats  { transition-delay: 0.65s; }
.hero .hero-visual { transition-delay: 0.3s; }

.hero-loaded .hero .fade-up,
.hero-loaded .hero .fade-right {
  opacity: 1;
  transform: translate(0);
}

/* 错落入场 */
.stagger-grid > * {
  opacity: 0;
  transform: translateY(24px);
  transition:
    opacity 0.6s cubic-bezier(0.22, 1, 0.36, 1),
    transform 0.6s cubic-bezier(0.22, 1, 0.36, 1);
  transition-delay: calc(var(--i, 0) * 0.1s);
}

.stagger-grid.visible > * {
  opacity: 1;
  transform: translateY(0);
}

/* 渐变文字微光 — 见 .hero h1 .gradient-text */

@keyframes shimmer {
  0%   { background-position: 0% center; }
  100% { background-position: 200% center; }
}

/* 背景光晕漂动 */
.hero-bg .orb {
  animation: orb-drift 12s ease-in-out infinite;
}

.hero-bg .orb-2 { animation-delay: -4s; animation-duration: 15s; }
.hero-bg .orb-3 { animation-delay: -8s; animation-duration: 10s; }

@keyframes orb-drift {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33%      { transform: translate(20px, -15px) scale(1.05); }
  66%      { transform: translate(-15px, 10px) scale(0.95); }
}

.hero-bg .grid-dots {
  animation: dots-shift 20s linear infinite;
}

@keyframes dots-shift {
  0%   { background-position: 0 0; }
  100% { background-position: 28px 28px; }
}

/* 中心徽章呼吸 */
.hero-center-badge {
  animation: badge-pulse 3s ease-in-out infinite;
}

@keyframes badge-pulse {
  0%, 100% { box-shadow: var(--shadow-lg); }
  50%      { box-shadow: 0 20px 60px rgba(75, 123, 245, 0.2); }
}

/* 按钮光泽 */
.btn-primary {
  position: relative;
  overflow: hidden;
}

.btn-primary::after {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 60%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
  transition: left 0.5s;
}

.btn-primary:hover::after { left: 120%; }

/* 卡片图标弹跳 */
.pain-card:hover .pain-icon-wrap,
.adv-card:hover .adv-icon-wrap {
  animation: icon-bounce 0.5s ease;
}

@keyframes icon-bounce {
  0%, 100% { transform: translateY(0); }
  40%      { transform: translateY(-6px); }
  70%      { transform: translateY(-2px); }
}

/* 流程步骤连线动画 */
.process-steps.visible::after {
  width: 75%;
}

.process-steps::after {
  content: "";
  position: absolute;
  top: 56px;
  left: 12.5%;
  height: 2px;
  width: 0;
  background: var(--gradient);
  border-radius: 2px;
  transition: width 1.2s cubic-bezier(0.22, 1, 0.36, 1) 0.3s;
  z-index: 0;
  opacity: 0.4;
}

.step-num {
  transition: transform 0.4s cubic-bezier(0.22, 1, 0.36, 1);
}

.step:hover .step-num {
  transform: scale(1.1) rotate(-3deg);
}

/* 导航当前区块高亮 */
.nav-links a {
  position: relative;
}

.nav-links a::after {
  content: "";
  position: absolute;
  bottom: 2px;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--gradient);
  border-radius: 2px;
  transition: width 0.3s, left 0.3s;
}

.nav-links a.active::after,
.nav-links a:hover::after {
  width: 60%;
  left: 20%;
}

.nav-links a.active {
  color: var(--primary);
  background: var(--primary-soft);
}

/* 标签微动 */
.tag {
  transition: transform 0.25s, background 0.25s;
}

.service-card:hover .tag:nth-child(odd)  { transform: translateY(-2px); }
.service-card:hover .tag:nth-child(even) { transform: translateY(-2px); transition-delay: 0.05s; }

/* 数字计数 */
.count-up {
  display: inline-block;
}

/* 联系卡片入场 */
.contact-box {
  opacity: 0;
  transform: translateY(24px) scale(0.98);
  transition:
    opacity 0.8s cubic-bezier(0.22, 1, 0.36, 1),
    transform 0.8s cubic-bezier(0.22, 1, 0.36, 1);
}

.contact-box.visible {
  opacity: 1;
  transform: translateY(0) scale(1);
}

.contact-card {
  opacity: 0;
  transform: translateY(16px);
  transition:
    opacity 0.5s ease,
    transform 0.5s ease,
    box-shadow 0.3s,
    background 0.3s;
  transition-delay: calc(var(--i, 0) * 0.15s + 0.3s);
}

.contact-box.visible .contact-card {
  opacity: 1;
  transform: translateY(0);
}

/* 减少动画偏好 */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .fade-up, .fade-left, .fade-right, .scale-in,
  .stagger-grid > *, .contact-box, .contact-card {
    opacity: 1;
    transform: none;
  }
}

/* ── Responsive ── */
@media (max-width: 960px) {
  .hero-layout { grid-template-columns: 1fr; }
  .hero-visual { display: none; }

  .nav .btn-primary { display: none; }
  .nav-links { display: none; }
  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: var(--nav-h);
    left: 16px;
    right: 16px;
    background: var(--surface);
    padding: 20px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-light);
    box-shadow: var(--shadow-lg);
    gap: 4px;
  }
  .nav-toggle { display: block; }

  .pain-grid,
  .adv-grid { grid-template-columns: 1fr 1fr; }

  .services-grid { grid-template-columns: 1fr; }

  .process-steps { grid-template-columns: 1fr 1fr; }
  .process-steps::after { display: none; }
  .cases-grid { grid-template-columns: 1fr; }
}

@media (max-width: 600px) {
  section { padding: 72px 0; }

  .pain-grid,
  .adv-grid,
  .process-steps { grid-template-columns: 1fr; }

  .contact-cards { grid-template-columns: 1fr; }
  .contact-box { padding: 32px 24px; }
  .footer-inner { flex-direction: column; text-align: center; }
  .hero-stats { flex-direction: column; }
}