/* ===== 重置与基础 ===== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --primary: #ff4757;
  --primary-dark: #e8404f;
  --primary-light: #ff6b7a;
  --secondary: #2f3542;
  --accent: #ffa502;
  --success: #2ed573;
  --bg: #ffffff;
  --bg-soft: #f8f9fa;
  --bg-dark: #1e272e;
  --text: #2f3542;
  --text-light: #57606f;
  --text-muted: #a4b0be;
  --border: #e8e8e8;
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
  --shadow-md: 0 8px 24px rgba(0,0,0,0.08);
  --shadow-lg: 0 20px 40px rgba(0,0,0,0.1);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --max-width: 1200px;
}

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

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

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

/* ===== 按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 14px 28px;
  border-radius: 50px;
  font-size: 16px;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: all 0.3s ease;
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  color: #fff;
  box-shadow: 0 6px 20px rgba(255, 71, 87, 0.35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 28px rgba(255, 71, 87, 0.45);
}

.btn-primary:active { transform: translateY(0); }

.btn-ghost {
  background: rgba(255,255,255,0.15);
  color: #fff;
  border: 1.5px solid rgba(255,255,255,0.4);
  backdrop-filter: blur(10px);
}

.btn-ghost:hover {
  background: rgba(255,255,255,0.25);
  border-color: rgba(255,255,255,0.6);
}

/* ===== 导航 ===== */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: rgba(255,255,255,0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid transparent;
  transition: all 0.3s ease;
}

.navbar.scrolled {
  background: rgba(255,255,255,0.95);
  border-bottom-color: var(--border);
  box-shadow: var(--shadow-sm);
}

.nav-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo { display: flex; align-items: center; gap: 10px; }

.logo-icon {
  width: 36px; height: 36px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-size: 18px;
  font-weight: 800;
}

.logo-text {
  font-size: 18px;
  font-weight: 700;
  color: var(--text);
  letter-spacing: 0.5px;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-link {
  padding: 8px 16px;
  font-size: 15px;
  font-weight: 500;
  color: var(--text-light);
  border-radius: 8px;
  transition: all 0.25s ease;
}

.nav-link:hover { color: var(--primary); background: rgba(255,71,87,0.06); }
.nav-link.active { color: var(--primary); background: rgba(255,71,87,0.08); }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  background: none;
  border: none;
  cursor: pointer;
}

.nav-toggle span {
  width: 24px; height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: all 0.3s ease;
}

.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ===== Hero区 ===== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 120px 20px 80px;
  overflow: hidden;
  background: linear-gradient(135deg, #ff4757 0%, #ff6b7a 40%, #ffa502 100%);
}

.hero-bg {
  position: absolute;
  inset: 0;
  overflow: hidden;
}

.hero-pattern {
  position: absolute;
  top: -50%; right: -30%;
  width: 80%; height: 200%;
  background:
    radial-gradient(circle at 30% 30%, rgba(255,255,255,0.15) 0%, transparent 50%),
    radial-gradient(circle at 70% 60%, rgba(255,255,255,0.1) 0%, transparent 40%),
    radial-gradient(circle at 50% 80%, rgba(255,165,2,0.3) 0%, transparent 50%);
  animation: float 20s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translate(0, 0) rotate(0deg); }
  33% { transform: translate(30px, -30px) rotate(2deg); }
  66% { transform: translate(-20px, 20px) rotate(-1deg); }
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  color: #fff;
  max-width: 800px;
  animation: fadeInUp 1s ease-out;
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 20px;
  background: rgba(255,255,255,0.2);
  backdrop-filter: blur(10px);
  border-radius: 50px;
  font-size: 14px;
  font-weight: 500;
  margin-bottom: 32px;
  border: 1px solid rgba(255,255,255,0.3);
}

.badge-dot {
  width: 8px; height: 8px;
  background: #2ed573;
  border-radius: 50%;
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(46,213,115,0.6); }
  50% { box-shadow: 0 0 0 8px rgba(46,213,115,0); }
}

.hero-title {
  font-size: clamp(36px, 7vw, 64px);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 24px;
  letter-spacing: -1px;
}

.highlight {
  background: linear-gradient(90deg, #fff 0%, #ffeaa7 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: clamp(16px, 2.5vw, 20px);
  opacity: 0.95;
  margin-bottom: 40px;
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 60px;
}

.hero-stats {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 32px;
  flex-wrap: wrap;
}

.stat-item { text-align: center; }

.stat-num {
  font-size: clamp(24px, 4vw, 36px);
  font-weight: 800;
  margin-bottom: 4px;
}

.stat-label {
  font-size: 14px;
  opacity: 0.85;
}

.stat-divider {
  width: 1px; height: 40px;
  background: rgba(255,255,255,0.3);
}

.hero-scroll {
  position: absolute;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%);
  color: rgba(255,255,255,0.7);
  font-size: 12px;
  text-align: center;
  z-index: 2;
}

.scroll-indicator {
  width: 24px; height: 40px;
  border: 2px solid rgba(255,255,255,0.5);
  border-radius: 12px;
  margin: 0 auto 8px;
  position: relative;
}

.scroll-indicator::after {
  content: '';
  position: absolute;
  top: 8px; left: 50%;
  width: 4px; height: 8px;
  background: #fff;
  border-radius: 2px;
  transform: translateX(-50%);
  animation: scrollDown 1.8s ease-in-out infinite;
}

@keyframes scrollDown {
  0% { top: 8px; opacity: 1; }
  100% { top: 24px; opacity: 0; }
}

/* ===== 通用Section ===== */
.section {
  padding: 100px 0;
  position: relative;
}

.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 60px;
}

.section-tag {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 2px;
  color: var(--primary);
  margin-bottom: 16px;
  text-transform: uppercase;
}

.section-tag.light { color: rgba(255,255,255,0.7); }

.section-title {
  font-size: clamp(28px, 4.5vw, 42px);
  font-weight: 800;
  color: var(--text);
  margin-bottom: 16px;
  line-height: 1.3;
  letter-spacing: -0.5px;
}

.section-title.light { color: #fff; }

.section-desc {
  font-size: 17px;
  color: var(--text-light);
  line-height: 1.8;
}

.section-desc.light { color: rgba(255,255,255,0.75); }

/* ===== 品类展示 ===== */
.categories { background: var(--bg-soft); }

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

.category-card {
  position: relative;
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  box-shadow: var(--shadow-sm);
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  border: 1px solid transparent;
  overflow: hidden;
}

.category-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 4px;
  background: var(--card-accent, var(--primary));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s ease;
}

.category-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(255,71,87,0.1);
}

.category-card:hover::before { transform: scaleX(1); }

.category-icon {
  width: 64px; height: 64px;
  border-radius: 16px;
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 24px;
  font-size: 28px;
  color: #fff;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
}

.category-icon svg { width: 32px; height: 32px; }

.category-icon.cosmetics { background: linear-gradient(135deg, #ff6b81, #ff4757); --card-accent: #ff4757; }
.category-icon.baby { background: linear-gradient(135deg, #70a1ff, #5352ed); --card-accent: #5352ed; }
.category-icon.appliances { background: linear-gradient(135deg, #1e90ff, #3742fa); --card-accent: #3742fa; }
.category-icon.anime { background: linear-gradient(135deg, #a55eea, #8854d0); --card-accent: #8854d0; }
.category-icon.daily { background: linear-gradient(135deg, #2ed573, #26de81); --card-accent: #26de81; }
.category-icon.more { background: linear-gradient(135deg, #ffa502, #ff7f50); --card-accent: #ff7f50; }

.category-name {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text);
}

.category-desc {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 20px;
}

.category-list {
  margin-bottom: 20px;
}

.category-list li {
  font-size: 14px;
  color: var(--text-light);
  padding: 6px 0;
  border-bottom: 1px dashed var(--border);
}

.category-list li:last-child { border-bottom: none; }

.category-arrow {
  position: absolute;
  bottom: 28px; right: 28px;
  width: 36px; height: 36px;
  border-radius: 50%;
  background: var(--bg-soft);
  display: flex; align-items: center; justify-content: center;
  font-size: 18px;
  color: var(--text-muted);
  transition: all 0.3s ease;
}

.category-card:hover .category-arrow {
  background: var(--primary);
  color: #fff;
  transform: translateX(4px);
}

/* ===== 核心优势 ===== */
.features {
  background: linear-gradient(135deg, var(--secondary) 0%, #1e272e 100%);
  color: #fff;
  position: relative;
  overflow: hidden;
}

.features::before {
  content: '';
  position: absolute;
  top: -100px; right: -100px;
  width: 400px; height: 400px;
  background: radial-gradient(circle, rgba(255,71,87,0.15) 0%, transparent 70%);
  border-radius: 50%;
}

.features::after {
  content: '';
  position: absolute;
  bottom: -150px; left: -100px;
  width: 500px; height: 500px;
  background: radial-gradient(circle, rgba(255,165,2,0.1) 0%, transparent 70%);
  border-radius: 50%;
}

.features .container { position: relative; z-index: 1; }

.feature-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.feature-card {
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius-xl);
  padding: 48px 32px;
  backdrop-filter: blur(10px);
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 100%;
  background: linear-gradient(180deg, rgba(255,255,255,0.03) 0%, transparent 50%);
  pointer-events: none;
}

.feature-card:hover {
  transform: translateY(-10px);
  background: rgba(255,255,255,0.08);
  border-color: rgba(255,255,255,0.15);
}

.feature-card.highlight-card {
  background: linear-gradient(135deg, rgba(255,71,87,0.2) 0%, rgba(255,165,2,0.15) 100%);
  border-color: rgba(255,71,87,0.3);
  transform: translateY(-10px);
}

.feature-card.highlight-card:hover {
  transform: translateY(-16px);
  border-color: rgba(255,71,87,0.5);
}

.feature-num {
  font-size: 14px;
  font-weight: 700;
  color: rgba(255,255,255,0.4);
  letter-spacing: 2px;
  margin-bottom: 24px;
}

.feature-icon {
  width: 64px; height: 64px;
  border-radius: 16px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 28px;
  color: #fff;
}

.feature-icon svg { width: 32px; height: 32px; }

.feature-title {
  font-size: 26px;
  font-weight: 700;
  margin-bottom: 16px;
  color: #fff;
}

.feature-desc {
  font-size: 15px;
  color: rgba(255,255,255,0.7);
  line-height: 1.8;
  margin-bottom: 24px;
}

.feature-list li {
  font-size: 14px;
  color: rgba(255,255,255,0.8);
  padding: 8px 0;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}

.feature-list li:last-child { border-bottom: none; }

/* ===== 购物流程 ===== */
.process { background: var(--bg); }

.process-steps {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  position: relative;
  max-width: 1000px;
  margin: 0 auto;
}

.step {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  flex: 1;
  position: relative;
  z-index: 1;
}

.step-circle {
  width: 64px; height: 64px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #fff;
  font-size: 24px;
  font-weight: 700;
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 20px;
  box-shadow: 0 8px 24px rgba(255,71,87,0.3);
}

.step-content h4 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text);
}

.step-content p {
  font-size: 14px;
  color: var(--text-light);
  line-height: 1.6;
}

.step-line {
  flex: 0.8;
  height: 2px;
  background: linear-gradient(90deg, var(--primary-light), var(--accent));
  margin-top: 32px;
  position: relative;
}

.step-line::after {
  content: '';
  position: absolute;
  right: -4px; top: -3px;
  width: 0; height: 0;
  border-left: 8px solid var(--accent);
  border-top: 4px solid transparent;
  border-bottom: 4px solid transparent;
}

/* ===== 关于我们 ===== */
.about { background: var(--bg-soft); }

.about-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 60px;
  align-items: center;
}

.about-content .section-tag { text-align: left; display: block; }
.about-content .section-title { text-align: left; }

.about-text {
  font-size: 16px;
  color: var(--text-light);
  line-height: 1.9;
  margin-bottom: 20px;
}

.about-advantages {
  margin-top: 36px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.adv-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  padding: 20px;
  background: #fff;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  transition: all 0.3s ease;
}

.adv-item:hover {
  transform: translateX(4px);
  box-shadow: var(--shadow-md);
}

.adv-icon {
  font-size: 28px;
  flex-shrink: 0;
  width: 48px; height: 48px;
  display: flex; align-items: center; justify-content: center;
  background: rgba(255,71,87,0.08);
  border-radius: 12px;
}

.adv-item strong {
  display: block;
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 6px;
  color: var(--text);
}

.adv-item p {
  font-size: 14px;
  color: var(--text-light);
  line-height: 1.6;
}

.about-visual {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  position: relative;
}

.about-visual::before {
  content: '';
  position: absolute;
  top: -20px; left: -20px; right: -20px; bottom: -20px;
  background: linear-gradient(135deg, rgba(255,71,87,0.1), rgba(255,165,2,0.1));
  border-radius: 30px;
  z-index: 0;
}

.visual-card {
  position: relative;
  z-index: 1;
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  text-align: center;
  box-shadow: var(--shadow-md);
  transition: all 0.3s ease;
}

.visual-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}

.card-1 { background: linear-gradient(135deg, #fff5f5, #ffe8e8); }
.card-2 { background: linear-gradient(135deg, #fff9e6, #fff0cc); margin-top: 30px; }
.card-3 { background: linear-gradient(135deg, #e8f8f0, #d4f5e3); margin-top: -10px; }
.card-4 { background: linear-gradient(135deg, #f0e8ff, #e8d9ff); margin-top: 20px; }

.vc-num {
  font-size: 32px;
  font-weight: 800;
  color: var(--text);
  margin-bottom: 6px;
}

.vc-label {
  font-size: 14px;
  color: var(--text-light);
  font-weight: 500;
}

/* ===== 联系 ===== */
.contact {
  padding: 80px 0;
  background: var(--bg);
}

.contact-card {
  background: linear-gradient(135deg, var(--secondary) 0%, #2c3e50 100%);
  border-radius: var(--radius-xl);
  padding: 60px;
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 60px;
  align-items: center;
  position: relative;
  overflow: hidden;
  color: #fff;
}

.contact-card::before {
  content: '';
  position: absolute;
  top: -50%; right: -20%;
  width: 600px; height: 600px;
  background: radial-gradient(circle, rgba(255,71,87,0.2) 0%, transparent 60%);
  border-radius: 50%;
}

.contact-left { position: relative; z-index: 1; }

.contact-left h2 {
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 20px;
  letter-spacing: -0.5px;
}

.contact-left > p {
  font-size: 16px;
  color: rgba(255,255,255,0.7);
  line-height: 1.8;
  margin-bottom: 36px;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.info-item {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.info-label {
  font-size: 14px;
  color: rgba(255,255,255,0.6);
  min-width: 100px;
}

.info-value {
  font-size: 16px;
  font-weight: 600;
  color: #fff;
}

.contact-right { position: relative; z-index: 1; display: flex; justify-content: center; }

.qr-wrapper {
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  text-align: center;
  box-shadow: var(--shadow-lg);
}

.qr-placeholder {
  width: 160px; height: 160px;
  margin: 0 auto 16px;
  color: var(--secondary);
  display: flex; align-items: center; justify-content: center;
}

.qr-placeholder svg { width: 100%; height: 100%; }

.qr-label {
  font-size: 14px;
  color: var(--text-light);
  font-weight: 500;
}

/* ===== 页脚 ===== */
.footer {
  background: var(--bg-dark);
  color: rgba(255,255,255,0.7);
  padding: 60px 0 30px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}

.footer-brand .logo-text { color: #fff; }

.footer-slogan {
  font-size: 14px;
  margin-top: 16px;
  color: rgba(255,255,255,0.5);
}

.footer-icp {
  font-size: 13px;
  margin-top: 20px;
  color: rgba(255,255,255,0.35);
}

.footer-links h5 {
  font-size: 16px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 20px;
}

.footer-links a {
  display: block;
  font-size: 14px;
  padding: 6px 0;
  color: rgba(255,255,255,0.5);
  transition: color 0.2s ease;
}

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

.footer-bottom {
  padding-top: 30px;
  text-align: center;
  font-size: 13px;
  color: rgba(255,255,255,0.35);
}

/* ===== 返回顶部 ===== */
.back-top {
  position: fixed;
  bottom: 30px; right: 30px;
  width: 48px; height: 48px;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  border: none;
  cursor: pointer;
  box-shadow: 0 8px 24px rgba(255,71,87,0.4);
  display: flex; align-items: center; justify-content: center;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all 0.3s ease;
  z-index: 999;
}

.back-top.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-top:hover {
  background: var(--primary-dark);
  transform: translateY(-4px);
}

.back-top svg { width: 20px; height: 20px; }

/* ===== 响应式 ===== */
@media (max-width: 960px) {
  .section { padding: 70px 0; }

  .nav-menu {
    position: fixed;
    top: 64px; left: 0; right: 0;
    background: rgba(255,255,255,0.98);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 20px;
    gap: 4px;
    border-bottom: 1px solid var(--border);
    transform: translateY(-120%);
    opacity: 0;
    transition: all 0.3s ease;
  }

  .nav-menu.open {
    transform: translateY(0);
    opacity: 1;
  }

  .nav-link {
    padding: 14px 20px;
    width: 100%;
  }

  .nav-toggle { display: flex; }

  .category-grid { grid-template-columns: repeat(2, 1fr); }

  .feature-cards { grid-template-columns: 1fr; }
  .feature-card.highlight-card { transform: none; }
  .feature-card.highlight-card:hover { transform: translateY(-6px); }

  .about-grid { grid-template-columns: 1fr; gap: 50px; }

  .process-steps { flex-direction: column; gap: 0; }
  .step-line {
    width: 2px; height: 40px;
    margin: 0;
    background: linear-gradient(180deg, var(--primary-light), var(--accent));
    flex: none;
  }
  .step-line::after {
    right: -3px; top: auto; bottom: -4px;
    border-left: 4px solid transparent;
    border-right: 4px solid transparent;
    border-top: 8px solid var(--accent);
  }

  .contact-card {
    grid-template-columns: 1fr;
    padding: 40px 30px;
    gap: 40px;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 30px;
  }
}

@media (max-width: 600px) {
  .hero {
    min-height: 90vh;
    padding: 100px 20px 60px;
  }

  .hero-stats { gap: 20px; }
  .stat-divider { height: 30px; }

  .section { padding: 60px 0; }
  .section-header { margin-bottom: 40px; }

  .category-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .category-card { padding: 28px 24px; }

  .feature-card { padding: 36px 28px; }

  .about-visual { gap: 14px; }
  .visual-card { padding: 24px 16px; }
  .vc-num { font-size: 26px; }

  .contact-card { padding: 36px 24px; }

  .footer-grid { grid-template-columns: 1fr; gap: 30px; }

  .back-top {
    bottom: 20px; right: 20px;
    width: 42px; height: 42px;
  }
}

/* ===== 入场动画 ===== */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}