/* ============================================================
   恒颜年轻官网 · 全局样式
   设计风格：现代大气 · 医疗健康 · 白色系 · 极简现代
   ============================================================ */

/* ---- 设计令牌 ---- */
:root {
  --primary: #1a1a2e;
  --primary-light: #3d3d5c;
  --primary-dark: #0d0d1a;
  --primary-bg: #f5f5f8;
  --primary-bg-2: #eeedf3;

  --white: #ffffff;
  --gray-50: #fafafa;
  --gray-100: #f5f5f5;
  --gray-200: #eeeeee;
  --gray-300: #e0e0e0;
  --gray-400: #bdbdbd;
  --gray-500: #9e9e9e;
  --gray-600: #757575;
  --gray-700: #616161;
  --gray-800: #424242;
  --gray-900: #1a1a2e;

  --bg-primary: #ffffff;
  --bg-secondary: #fafafa;
  --bg-tertiary: #f5f5f5;

  --text-primary: #1a1a2e;
  --text-secondary: #616161;
  --text-muted: #9e9e9e;
  --text-primary-color: #1a1a2e;

  --border: rgba(26,26,46,0.12);
  --border-light: rgba(0,0,0,0.06);
  --border-medium: rgba(0,0,0,0.1);

  --radius-sm: 8px;
  --radius: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;

  --shadow-sm: 0 2px 12px rgba(0,0,0,0.04);
  --shadow: 0 4px 24px rgba(0,0,0,0.06);
  --shadow-lg: 0 12px 48px rgba(0,0,0,0.08);
  --shadow-primary: 0 8px 32px rgba(26,26,46,0.12);

  --transition: 0.4s cubic-bezier(0.25,0.46,0.45,0.94);
  --font-serif: 'Noto Serif SC', 'Songti SC', Georgia, serif;
  --font-sans: 'Noto Sans SC', -apple-system, 'PingFang SC', sans-serif;
}

/* ---- Reset & Base ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
input, textarea, select, button { font-family: inherit; }

/* ---- Utilities ---- */
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.section { padding: 120px 0; }
.section-tag {
  display: inline-block;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--primary);
  background: var(--primary-bg);
  border: 1px solid var(--border);
  border-radius: 100px;
  padding: 5px 16px;
  margin-bottom: 20px;
}
.section-title {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 600;
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--text-primary);
  margin-bottom: 16px;
}
.section-title em { font-style: normal; color: var(--primary); }
.section-sub { font-size: 1.05rem; color: var(--text-secondary); max-width: 500px; }
.section-header { text-align: center; margin-bottom: 72px; }
.section-header .section-sub { margin: 0 auto; }

/* ============================================================
   NAVBAR
   ============================================================ */
.navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  padding: 0;
  background: transparent;
  transition: background var(--transition), box-shadow var(--transition);
}
.navbar.scrolled {
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: 0 1px 0 var(--border-light);
}
.nav-container {
  max-width: 1200px; margin: 0 auto; padding: 0 24px;
  height: 72px; display: flex; align-items: center; gap: 40px;
}
.nav-logo { display: flex; align-items: center; gap: 4px; flex-shrink: 0; }
.logo-icon {
  font-family: var(--font-serif);
  font-size: 1.35rem; font-weight: 700;
  color: var(--primary);
}
.logo-text {
  font-family: var(--font-serif);
  font-size: 1.35rem; font-weight: 400;
  color: var(--text-primary);
}
.nav-links {
  display: flex; align-items: center; gap: 36px;
  margin-left: auto;
}
.nav-links a {
  font-size: 0.875rem; font-weight: 400;
  color: var(--gray-600);
  transition: color 0.2s;
  position: relative;
}
.nav-links a::after {
  content: ''; position: absolute; bottom: -4px; left: 0; right: 0;
  height: 1px; background: var(--primary);
  transform: scaleX(0); transition: transform 0.3s;
}
.nav-links a:hover { color: var(--primary); }
.nav-links a:hover::after { transform: scaleX(1); }
.nav-cta {
  display: flex; align-items: center; gap: 6px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #fff !important;
  font-size: 0.875rem; font-weight: 600;
  padding: 9px 22px; border-radius: 100px;
  white-space: nowrap;
  transition: transform 0.2s, box-shadow 0.2s;
}
.nav-cta:hover { transform: translateY(-1px); box-shadow: 0 6px 24px rgba(26,26,46,0.2); }
.nav-toggle {
  display: none; background: none; border: none; cursor: pointer;
  flex-direction: column; gap: 5px; padding: 4px;
}
.nav-toggle span { display: block; width: 22px; height: 2px; background: var(--text-primary); border-radius: 2px; transition: var(--transition); }

/* ============================================================
   HERO SLIDER
   ============================================================ */
.hero-slider {
  position: relative;
  width: 100%;
  height: 100vh;
  min-height: 600px;
  overflow: hidden;
}
.slider-track {
  display: flex;
  width: 100%;
  height: 100%;
  transition: transform 0.8s cubic-bezier(0.65, 0, 0.35, 1);
}
.slider-slide {
  flex: 0 0 100%;
  width: 100%;
  height: 100%;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* 每张幻灯片背景 - 由JavaScript动态设置 */
/* 默认背景（当未设置图片时显示） */
.slider-slide:nth-child(1) {
  background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
}
.slider-slide:nth-child(2) {
  background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
}
.slider-slide:nth-child(3) {
  background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
}
.slider-slide:nth-child(4) {
  background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
}
/* 幻灯片暗色遮罩 */
.slider-slide::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(255,255,255,0.75) 0%, rgba(255,255,255,0.55) 50%, rgba(255,255,255,0.7) 100%);
  z-index: 1;
}

/* 幻灯片装饰 */
.slide-deco {
  position: absolute;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
  z-index: 0;
}
.slide-deco::before {
  content: '';
  position: absolute;
  top: -20%;
  right: -10%;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255,255,255,0.3) 0%, transparent 70%);
}
.slide-deco::after {
  content: '';
  position: absolute;
  bottom: -15%;
  left: -5%;
  width: 500px;
  height: 500px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255,255,255,0.2) 0%, transparent 70%);
}

/* 幻灯片内容 */
.slide-content {
  position: relative;
  z-index: 3;
  text-align: center;
  padding: 100px 24px 80px;
  max-width: 900px;
}
.slide-tag {
  display: inline-block;
  font-size: 0.8rem; letter-spacing: 0.15em; font-weight: 400;
  color: var(--primary);
  background: rgba(255,255,255,0.7);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid rgba(26,26,46,0.1);
  padding: 6px 18px; border-radius: 100px;
  margin-bottom: 24px;
}
.slide-title {
  font-family: var(--font-serif);
  font-size: clamp(2.4rem, 6vw, 4.5rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--primary);
  margin-bottom: 20px;
}
.slide-title em { font-style: normal; color: var(--primary-light); }
.slide-desc {
  font-size: clamp(0.95rem, 2vw, 1.15rem);
  color: var(--text-secondary);
  font-weight: 300;
  line-height: 1.9;
  margin-bottom: 40px;
}

/* 轮播控制 */
.slider-arrows {
  position: absolute;
  top: 50%;
  left: 0; right: 0;
  transform: translateY(-50%);
  z-index: 20;
  display: flex;
  justify-content: space-between;
  padding: 0 32px;
  pointer-events: none;
}
.slider-arrow {
  width: 52px; height: 52px;
  border-radius: 50%;
  background: rgba(255,255,255,0.6);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(26,26,46,0.1);
  color: var(--primary);
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: background 0.3s, transform 0.3s;
  pointer-events: all;
}
.slider-arrow:hover {
  background: rgba(255,255,255,0.9);
  transform: scale(1.08);
}
.slider-arrow svg { width: 22px; height: 22px; }

/* 轮播指示器 */
.slider-dots {
  position: absolute;
  bottom: 80px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 20;
  display: flex;
  gap: 10px;
}
.slider-dot {
  width: 12px; height: 3px;
  border-radius: 100px;
  background: rgba(26,26,46,0.2);
  border: none;
  cursor: pointer;
  transition: width 0.4s, background 0.3s;
  padding: 0;
}
.slider-dot.active {
  width: 36px;
  background: var(--primary);
}

/* Hero 统计数据 */
.hero-stats {
  display: flex; align-items: center; justify-content: center;
  gap: 40px; flex-wrap: wrap;
}
.stat-item { text-align: center; }
.stat-num {
  font-family: var(--font-serif);
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  font-weight: 700; color: var(--primary);
}
.stat-plus { font-size: 1.2rem; color: var(--primary-light); }
.stat-item p { font-size: 0.8rem; color: var(--text-muted); letter-spacing: 0.1em; margin-top: 4px; }
.stat-divider { width: 1px; height: 48px; background: rgba(26,26,46,0.15); }

/* Hero 向下滚动提示 */
.hero-scroll {
  position: absolute; bottom: 32px; left: 50%; transform: translateX(-50%);
  z-index: 20; display: flex; flex-direction: column; align-items: center; gap: 8px;
}
.hero-scroll span { font-size: 0.7rem; letter-spacing: 0.2em; color: var(--text-muted); }
.scroll-line {
  width: 1px; height: 48px;
  background: linear-gradient(to bottom, var(--text-muted), transparent);
  animation: scrollAnim 2s infinite;
}
@keyframes scrollAnim {
  0% { transform: scaleY(0); transform-origin: top; }
  50% { transform: scaleY(1); transform-origin: top; }
  51% { transform: scaleY(1); transform-origin: bottom; }
  100% { transform: scaleY(0); transform-origin: bottom; }
}

/* ============================================================
   ABOUT
   ============================================================ */
.about { background: var(--bg-secondary); }
.about-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 80px; align-items: center;
}
.about-visual { display: flex; flex-direction: column; gap: 16px; }
.about-card-main {
  background: var(--white);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 40px;
  display: flex; flex-direction: column; align-items: center;
  text-align: center;
  position: relative; overflow: hidden;
  box-shadow: var(--shadow-sm);
}
.about-card-main::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(90deg, var(--primary-light), var(--primary), var(--primary-light));
}
.about-card-badge {
  position: absolute; top: 16px; right: 16px;
  font-size: 0.7rem; letter-spacing: 0.15em;
  background: var(--primary-bg); border: 1px solid var(--border);
  color: var(--primary); padding: 3px 10px; border-radius: 100px;
}
.about-icon-wrap { width: 80px; height: 80px; margin-bottom: 16px; }
.about-card-main h3 {
  font-family: var(--font-serif); font-size: 1.4rem; font-weight: 600;
  color: var(--primary); margin-bottom: 4px;
}
.about-card-main p { font-size: 0.85rem; color: var(--text-muted); }

.about-card-info {
  background: var(--white); border: 1px solid var(--border-light);
  border-radius: var(--radius); padding: 24px;
  box-shadow: var(--shadow-sm);
}
.info-row {
  display: flex; justify-content: space-between; align-items: center;
  padding: 10px 0; border-bottom: 1px solid var(--gray-200);
  font-size: 0.9rem;
}
.info-row:last-child { border-bottom: none; }
.info-label { color: var(--text-muted); font-size: 0.8rem; flex-shrink: 0; margin-right: 12px; }

.about-card-branch {
  background: var(--primary-bg);
  border: 1px solid var(--border); border-radius: var(--radius); padding: 20px 24px;
}
.branch-label { font-size: 0.75rem; color: var(--text-muted); letter-spacing: 0.1em; margin-bottom: 12px; }
.branch-cities { display: flex; gap: 10px; flex-wrap: wrap; }
.branch-cities span {
  background: var(--white); border: 1px solid var(--border);
  color: var(--primary); font-size: 0.85rem; padding: 6px 14px; border-radius: 100px;
}
.branch-cities span em { font-style: normal; font-size: 0.7rem; margin-left: 4px; opacity: 0.7; }

.about-content .about-desc {
  font-size: 1rem; color: var(--text-secondary); line-height: 1.9; margin-bottom: 16px;
}
.about-content .about-desc strong { color: var(--text-primary); font-weight: 500; }
.about-content .about-desc em { color: var(--primary); font-style: normal; }

.about-advantages {
  display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin: 32px 0;
}
.adv-item {
  display: flex; gap: 14px; align-items: flex-start;
  background: var(--white); border: 1px solid var(--border-light);
  border-radius: var(--radius); padding: 16px;
  transition: border-color 0.3s, box-shadow 0.3s;
  box-shadow: var(--shadow-sm);
}
.adv-item:hover { border-color: var(--border); box-shadow: var(--shadow); }
.adv-icon { width: 40px; height: 40px; flex-shrink: 0; }
.adv-item h4 { font-size: 0.9rem; font-weight: 600; margin-bottom: 4px; color: var(--text-primary); }
.adv-item p { font-size: 0.8rem; color: var(--text-muted); line-height: 1.6; }

.dept-label { font-size: 0.75rem; color: var(--text-muted); letter-spacing: 0.1em; margin-bottom: 12px; }
.dept-tags { display: flex; flex-wrap: wrap; gap: 8px; }
.dept-tags span {
  font-size: 0.82rem; color: var(--text-secondary);
  background: var(--white); border: 1px solid var(--border-light);
  padding: 5px 12px; border-radius: var(--radius-sm);
  transition: background 0.2s, color 0.2s;
}
.dept-tags span:hover { background: var(--primary-bg); color: var(--primary); border-color: var(--border); }

/* ============================================================
   SERVICES
   ============================================================ */
.services { background: var(--bg-primary); }
.services-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px;
}
.service-card {
  background: var(--white); border: 1px solid var(--border-light);
  border-radius: var(--radius-lg); padding: 36px 28px;
  position: relative; overflow: hidden;
  transition: transform 0.35s, border-color 0.35s, box-shadow 0.35s;
  cursor: pointer;
  box-shadow: var(--shadow-sm);
}
.service-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(90deg, var(--primary-light), var(--primary), var(--primary-light));
  opacity: 0; transition: opacity 0.35s;
}
.service-card:hover { transform: translateY(-6px); border-color: var(--border); box-shadow: var(--shadow-primary); }
.service-card:hover::before { opacity: 1; }
.service-card.featured {
  background: var(--primary-bg);
  border-color: var(--border);
}
.service-num {
  font-size: 0.75rem; font-weight: 500; letter-spacing: 0.15em;
  color: var(--text-muted); margin-bottom: 20px;
}
.service-icon { width: 64px; height: 64px; margin-bottom: 20px; }
.service-card h3 {
  font-family: var(--font-serif); font-size: 1.15rem; font-weight: 600;
  color: var(--text-primary); margin-bottom: 12px; line-height: 1.4;
}
.service-card p { font-size: 0.875rem; color: var(--text-secondary); line-height: 1.8; margin-bottom: 20px; }
.service-tags { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 20px; }
.service-tags span {
  font-size: 0.72rem; letter-spacing: 0.05em;
  background: var(--primary-bg); border: 1px solid var(--border);
  color: var(--primary); padding: 3px 10px; border-radius: 100px;
}
.service-arrow {
  font-size: 1.2rem; color: var(--primary); opacity: 0;
  transition: opacity 0.3s, transform 0.3s;
  transform: translateX(-8px);
}
.service-card:hover .service-arrow { opacity: 1; transform: translateX(0); }

.service-cta-card {
  background: linear-gradient(135deg, var(--primary-dark), var(--primary));
  border: none;
}
.service-cta-card:hover { box-shadow: 0 12px 48px rgba(26,26,46,0.2); }
.cta-inner { display: flex; flex-direction: column; justify-content: center; height: 100%; }
.cta-icon { width: 64px; height: 64px; margin-bottom: 20px; }
.service-cta-card h3 { color: #fff; font-size: 1.15rem; }
.service-cta-card p { color: rgba(255,255,255,0.75); font-size: 0.875rem; }
.btn-primary-sm {
  display: inline-flex; align-items: center; gap: 8px;
  background: #fff; color: var(--primary);
  font-size: 0.875rem; font-weight: 600;
  padding: 10px 22px; border-radius: 100px; margin-top: 20px;
  transition: transform 0.2s, box-shadow 0.2s;
}
.btn-primary-sm:hover { transform: translateY(-1px); box-shadow: var(--shadow); }

/* ============================================================
   TRUST
   ============================================================ */
.trust { background: var(--bg-secondary); }
.trust-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.trust-block {
  background: var(--white); border: 1px solid var(--border-light);
  border-radius: var(--radius-lg); padding: 32px 28px;
  transition: transform 0.3s, box-shadow 0.3s;
  box-shadow: var(--shadow-sm);
}
.trust-block:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.trust-block-title {
  display: flex; align-items: center; gap: 10px;
  font-family: var(--font-serif); font-size: 1.05rem; font-weight: 600;
  color: var(--primary); margin-bottom: 24px;
}
.trust-block-title svg { width: 20px; height: 20px; flex-shrink: 0; stroke: var(--primary); }
.trust-items { display: flex; flex-direction: column; gap: 12px; }
.trust-item {
  display: flex; align-items: flex-start; gap: 10px;
  font-size: 0.875rem; color: var(--text-secondary); line-height: 1.6;
}
.ti-dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--primary); flex-shrink: 0; margin-top: 7px;
}

/* ============================================================
   CASES
   ============================================================ */
.cases {
  background: var(--primary-bg);
  color: var(--text-primary);
}
.cases-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-bottom: 60px; }
.case-card {
  background: white;
  border-radius: var(--radius-lg); padding: 32px 28px;
  box-shadow: 0 2px 16px rgba(0,0,0,0.04);
  border: 1px solid var(--border-light);
  transition: transform 0.3s, box-shadow 0.3s;
}
.case-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.case-num {
  font-family: var(--font-serif);
  font-size: 2.8rem; font-weight: 700; color: var(--primary);
  line-height: 1;
}
.case-plus { font-size: 1rem; color: var(--primary); margin-bottom: 8px; }
.case-card h4 { font-size: 1rem; font-weight: 600; color: var(--text-primary); margin-bottom: 8px; }
.case-card p { font-size: 0.85rem; color: var(--text-secondary); margin-bottom: 16px; }
.case-bar { height: 3px; background: var(--primary-bg-2); border-radius: 100px; overflow: hidden; }
.case-bar-fill { height: 100%; background: linear-gradient(90deg, var(--primary), var(--primary-light)); border-radius: 100px; width: 0; transition: width 1.5s ease; }

.total-stat {
  text-align: center; padding: 48px;
  background: white; border-radius: var(--radius-xl);
  box-shadow: var(--shadow);
  border: 1px solid var(--border-light);
}
.total-num {
  font-family: var(--font-serif);
  font-size: clamp(3rem, 8vw, 5rem);
  font-weight: 700; color: var(--primary);
}
.total-label { font-size: 1.1rem; color: var(--text-secondary); margin-top: 8px; }

/* ============================================================
   CONTACT
   ============================================================ */
.contact { background: var(--bg-primary); }
.contact-grid { display: grid; grid-template-columns: 1fr 1.2fr; gap: 80px; align-items: start; }
.contact-sub { font-size: 1rem; color: var(--text-secondary); margin-bottom: 48px; }
.contact-items { display: flex; flex-direction: column; gap: 24px; }
.contact-item { display: flex; gap: 16px; align-items: flex-start; }
.ci-icon {
  width: 44px; height: 44px; border-radius: 50%;
  background: var(--primary-bg); border: 1px solid var(--border);
  display: flex; align-items: center; justify-content: center; flex-shrink: 0;
}
.ci-icon svg { width: 20px; height: 20px; stroke: var(--primary); }
.ci-label { font-size: 0.78rem; color: var(--text-muted); letter-spacing: 0.05em; margin-bottom: 2px; }
.ci-value { font-size: 0.95rem; color: var(--text-primary); line-height: 1.6; }

.contact-form-wrap {
  background: var(--white); border: 1px solid var(--border-light);
  border-radius: var(--radius-xl); padding: 40px;
  position: relative; overflow: hidden;
  box-shadow: var(--shadow);
}
.contact-form-wrap::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(90deg, var(--primary-light), var(--primary), var(--primary-light));
}
.contact-form h3 {
  font-family: var(--font-serif); font-size: 1.4rem; font-weight: 600;
  color: var(--text-primary); margin-bottom: 8px;
}
.contact-form > p { font-size: 0.875rem; color: var(--text-muted); margin-bottom: 28px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-group { display: flex; flex-direction: column; gap: 8px; margin-bottom: 16px; }
.form-group label { font-size: 0.82rem; color: var(--text-secondary); letter-spacing: 0.03em; }
.form-group input, .form-group select, .form-group textarea {
  background: var(--bg-secondary); border: 1px solid var(--border-light);
  border-radius: var(--radius); padding: 12px 16px;
  color: var(--text-primary); font-size: 0.9rem;
  transition: border-color 0.25s, box-shadow 0.25s;
  outline: none;
  width: 100%;
}
.form-group select { cursor: pointer; }
.form-group select option { background: var(--white); color: var(--text-primary); }
.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
  border-color: var(--primary); box-shadow: 0 0 0 3px rgba(26,26,46,0.08);
}
.form-group input::placeholder, .form-group textarea::placeholder { color: var(--text-muted); }
.form-group textarea { resize: vertical; min-height: 100px; }
.btn-submit {
  width: 100%; display: flex; align-items: center; justify-content: center; gap: 10px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #fff; font-size: 1rem; font-weight: 600;
  padding: 14px; border-radius: var(--radius); border: none; cursor: pointer;
  transition: transform 0.25s, box-shadow 0.25s;
  margin-top: 8px;
}
.btn-submit:hover { transform: translateY(-2px); box-shadow: var(--shadow-primary); }
.btn-submit svg { width: 20px; height: 20px; stroke: #fff; }
.form-note { font-size: 0.75rem; color: var(--text-muted); margin-top: 12px; text-align: center; }

/* ============================================================
   FOOTER
   ============================================================ */
.footer {
  background: var(--gray-900); border-top: 1px solid rgba(255,255,255,0.06);
  color: rgba(255,255,255,0.7);
}
.footer-top {
  display: grid; grid-template-columns: 2fr 1fr 1fr 1.5fr; gap: 60px;
  padding: 80px 0 60px;
}
.footer-logo { display: flex; align-items: center; gap: 4px; margin-bottom: 16px; }
.footer-logo .logo-text { color: rgba(255,255,255,0.9); }
.footer-brand p { font-size: 0.9rem; color: rgba(255,255,255,0.45); line-height: 1.8; margin-bottom: 8px; }
.footer-company { font-size: 0.8rem; color: rgba(255,255,255,0.35); }
.footer-links, .footer-services, .footer-contact { display: flex; flex-direction: column; }
.footer-links h4, .footer-services h4, .footer-contact h4 {
  font-size: 0.85rem; font-weight: 600; color: rgba(255,255,255,0.85);
  letter-spacing: 0.08em; margin-bottom: 16px;
}
.footer-links a, .footer-services a {
  font-size: 0.875rem; color: rgba(255,255,255,0.45);
  padding: 5px 0; transition: color 0.2s;
}
.footer-links a:hover, .footer-services a:hover { color: var(--primary-light); }
.footer-contact p { font-size: 0.875rem; color: rgba(255,255,255,0.45); padding: 4px 0; }
.footer-cities { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 12px; }
.footer-cities span {
  font-size: 0.75rem; background: rgba(255,255,255,0.06); border: 1px solid rgba(255,255,255,0.1);
  color: rgba(255,255,255,0.5); padding: 3px 10px; border-radius: 100px;
}
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.06); padding: 24px 0;
  display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 8px;
}
.footer-bottom p { font-size: 0.78rem; color: rgba(255,255,255,0.3); }

/* ============================================================
   BACK TO TOP
   ============================================================ */
.back-top {
  position: fixed; bottom: 32px; right: 32px; z-index: 999;
  width: 44px; height: 44px; border-radius: 50%;
  background: var(--primary); border: none; cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  opacity: 0; transform: translateY(16px); pointer-events: none;
  transition: opacity 0.3s, transform 0.3s, box-shadow 0.3s;
  box-shadow: 0 4px 16px rgba(26,26,46,0.15);
}
.back-top.visible { opacity: 1; transform: translateY(0); pointer-events: all; }
.back-top:hover { box-shadow: 0 8px 24px rgba(26,26,46,0.25); }
.back-top svg { width: 20px; height: 20px; stroke: #fff; }

/* ============================================================
   ANIMATIONS
   ============================================================ */
.fade-up {
  opacity: 0; transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.fade-up.visible { opacity: 1; transform: translateY(0); }

/* 幻灯片内容淡入动画 */
.slide-content {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease 0.2s, transform 0.6s ease 0.2s;
}
.slider-slide.active .slide-content {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 1024px) {
  .about-grid { grid-template-columns: 1fr; gap: 48px; }
  .services-grid { grid-template-columns: repeat(2, 1fr); }
  .trust-grid { grid-template-columns: 1fr 1fr; }
  .cases-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-top { grid-template-columns: 1fr 1fr; gap: 40px; }
}

@media (max-width: 768px) {
  .section { padding: 80px 0; }
  .nav-links { display: none; }
  .nav-toggle { display: flex; }
  .nav-links.open {
    display: flex; flex-direction: column; gap: 0;
    position: fixed; top: 72px; left: 0; right: 0;
    background: rgba(255,255,255,0.98);
    backdrop-filter: blur(20px);
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-light);
  }
  .nav-links.open a {
    padding: 14px 0; border-bottom: 1px solid var(--gray-200); font-size: 1rem;
    color: var(--text-primary);
  }
  .nav-cta { display: none; }
  .hero-stats { gap: 20px; }
  .stat-divider { display: none; }
  .about-advantages { grid-template-columns: 1fr; }
  .services-grid { grid-template-columns: 1fr; }
  .trust-grid { grid-template-columns: 1fr; }
  .cases-grid { grid-template-columns: 1fr 1fr; }
  .contact-grid { grid-template-columns: 1fr; gap: 40px; }
  .footer-top { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .form-row { grid-template-columns: 1fr; }
  .slider-arrows { padding: 0 16px; }
  .slider-arrow { width: 40px; height: 40px; }
  .slider-arrow svg { width: 18px; height: 18px; }
  .slider-dots { bottom: 60px; }
  .slide-title { font-size: clamp(1.8rem, 5vw, 3rem); }
}

@media (max-width: 480px) {
  .cases-grid { grid-template-columns: 1fr; }
  .hero-stats { flex-direction: column; gap: 12px; }
  .slider-arrows { padding: 0 12px; }
  .slider-arrow { width: 36px; height: 36px; }
}

/* ============================================================
   PROJECTS / DEPARTMENTS
   ============================================================ */
.projects { background: var(--bg-primary); }
.projects-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;
}
.project-card {
  background: var(--white); border: 1px solid var(--border-light);
  border-radius: var(--radius-lg); overflow: hidden;
  transition: transform 0.35s, border-color 0.35s, box-shadow 0.35s;
  box-shadow: var(--shadow-sm);
  cursor: pointer;
}
.project-card:hover { transform: translateY(-6px); border-color: var(--border); box-shadow: var(--shadow-primary); }
.project-card-img {
  width: 100%; height: 200px;
  display: flex; align-items: center; justify-content: center;
  position: relative; overflow: hidden;
}
.project-card-img img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform 0.5s;
}
.project-card:hover .project-card-img img {
  transform: scale(1.05);
}
.project-card-body { padding: 24px 28px; }
.project-card-tag {
  display: inline-block; font-size: 0.7rem; letter-spacing: 0.1em; font-weight: 500;
  color: var(--primary); background: var(--primary-bg);
  border: 1px solid var(--border); padding: 3px 10px; border-radius: 100px;
  margin-bottom: 12px;
}
.project-card-body h3 {
  font-family: var(--font-serif); font-size: 1.15rem; font-weight: 600;
  color: var(--text-primary); margin-bottom: 10px; line-height: 1.4;
}
.project-card-body p { font-size: 0.875rem; color: var(--text-secondary); line-height: 1.8; margin-bottom: 16px; }
.project-card-stats {
  display: flex; gap: 20px; padding-top: 16px;
  border-top: 1px solid var(--gray-200);
}
.project-stat { display: flex; align-items: center; gap: 6px; }
.project-stat-num { font-family: var(--font-serif); font-size: 1.1rem; font-weight: 700; color: var(--primary); }
.project-stat-label { font-size: 0.75rem; color: var(--text-muted); }

/* 特色科室标签式卡片 */
.dept-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px;
}
.dept-card {
  background: var(--white); border: 1px solid var(--border-light);
  border-radius: var(--radius-lg); overflow: hidden;
  text-align: center; transition: transform 0.35s, border-color 0.35s, box-shadow 0.35s;
  box-shadow: var(--shadow-sm); cursor: pointer;
}
.dept-card:hover { transform: translateY(-6px); border-color: var(--border); box-shadow: var(--shadow-primary); }
/* 图片模式 */
.dept-card-img {
  width: 100%; height: 180px; overflow: hidden;
  position: relative;
}
.dept-card-img img {
  width: 100%; height: 100%; object-fit: cover;
  transition: transform 0.5s ease;
}
.dept-card:hover .dept-card-img img { transform: scale(1.08); }
.dept-card-body {
  padding: 20px 24px 28px;
}
/* 兼容旧的 icon 模式（无图片时居中） */
.dept-card-icon {
  width: 72px; height: 72px; border-radius: 50%;
  background: var(--primary-bg); border: 1px solid var(--border);
  display: flex; align-items: center; justify-content: center;
  margin: 32px auto 20px;
  transition: background 0.3s, border-color 0.3s;
}
.dept-card:hover .dept-card-icon { background: var(--primary); border-color: var(--primary); }
.dept-card:hover .dept-card-icon svg { stroke: #fff; }
.dept-card-icon svg { width: 32px; height: 32px; stroke: var(--primary); transition: stroke 0.3s; }
.dept-card h3 {
  font-family: var(--font-serif); font-size: 1.1rem; font-weight: 600;
  color: var(--text-primary); margin-bottom: 10px;
}
.dept-card p { font-size: 0.85rem; color: var(--text-secondary); line-height: 1.7; }

/* ============================================================
   EXPERTS TEAM
   ============================================================ */
.experts { background: var(--bg-primary); }
.experts-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px;
}
.expert-card {
  background: var(--white); border: 1px solid var(--border-light);
  border-radius: var(--radius-lg); overflow: hidden;
  text-align: center;
  transition: transform 0.35s, border-color 0.35s, box-shadow 0.35s;
  box-shadow: var(--shadow-sm); cursor: pointer;
}
.expert-card:hover { transform: translateY(-6px); border-color: var(--border); box-shadow: var(--shadow-primary); }
.expert-avatar {
  width: 100%; height: 220px;
  display: flex; align-items: center; justify-content: center;
  position: relative; overflow: hidden;
}
.expert-avatar img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform 0.5s;
}
.expert-card:hover .expert-avatar img {
  transform: scale(1.05);
}
.expert-card-body { padding: 24px 20px; }
.expert-name {
  font-family: var(--font-serif); font-size: 1.1rem; font-weight: 600;
  color: var(--text-primary); margin-bottom: 6px;
}
.expert-title { font-size: 0.8rem; color: var(--primary); font-weight: 500; margin-bottom: 10px; }
.expert-desc { font-size: 0.82rem; color: var(--text-secondary); line-height: 1.7; margin-bottom: 14px; }
.expert-tags { display: flex; flex-wrap: wrap; justify-content: center; gap: 6px; }
.expert-tags span {
  font-size: 0.7rem; letter-spacing: 0.03em;
  background: var(--primary-bg); border: 1px solid var(--border);
  color: var(--primary); padding: 3px 10px; border-radius: 100px;
}
.expert-consult {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 0.82rem; color: var(--primary); font-weight: 500;
  margin-top: 16px; opacity: 0;
  transition: opacity 0.3s, transform 0.3s;
  transform: translateY(4px);
}
.expert-card:hover .expert-consult { opacity: 1; transform: translateY(0); }

/* ============================================================
   NEWS CENTER
   ============================================================ */
.news { background: var(--bg-primary); }
.news-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;
}
.news-card {
  background: var(--white); border: 1px solid var(--border-light);
  border-radius: var(--radius-lg); overflow: hidden;
  transition: transform 0.35s, border-color 0.35s, box-shadow 0.35s;
  box-shadow: var(--shadow-sm); cursor: pointer;
}
.news-card:hover { transform: translateY(-6px); border-color: var(--border); box-shadow: var(--shadow-primary); }
.news-card-img {
  width: 100%; height: 200px;
  display: flex; align-items: center; justify-content: center;
  position: relative; overflow: hidden;
}
.news-card-img img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform 0.5s;
}
.news-card:hover .news-card-img img {
  transform: scale(1.05);
}
.news-card-body { padding: 24px 28px; }
.news-card-meta {
  display: flex; align-items: center; gap: 12px; margin-bottom: 14px;
}
.news-card-date { font-size: 0.75rem; color: var(--text-muted); }
.news-card-cat {
  font-size: 0.7rem; letter-spacing: 0.05em; font-weight: 500;
  color: var(--primary); background: var(--primary-bg);
  border: 1px solid var(--border); padding: 2px 8px; border-radius: 100px;
}
.news-card-body h3 {
  font-family: var(--font-serif); font-size: 1.05rem; font-weight: 600;
  color: var(--text-primary); margin-bottom: 10px; line-height: 1.5;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.news-card-body p {
  font-size: 0.85rem; color: var(--text-secondary); line-height: 1.7;
  display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden;
  margin-bottom: 16px;
}
.news-card-link {
  font-size: 0.82rem; color: var(--primary); font-weight: 500;
  display: inline-flex; align-items: center; gap: 4px;
  transition: gap 0.3s;
}
.news-card:hover .news-card-link { gap: 8px; }

/* 新闻分类Tab */
.news-tabs {
  display: flex; justify-content: center; gap: 8px;
  margin-bottom: 48px; flex-wrap: wrap;
}
.news-tab {
  font-size: 0.85rem; color: var(--text-secondary);
  padding: 8px 20px; border-radius: 100px;
  border: 1px solid var(--border-light);
  background: var(--white); cursor: pointer;
  transition: all 0.3s;
}
.news-tab:hover, .news-tab.active {
  color: var(--white); background: var(--primary);
  border-color: var(--primary);
}

/* ============================================================
   BRAND GALLERY - 品牌环境展示
   ============================================================ */
.brand-gallery { background: var(--bg-secondary); }
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-template-rows: 260px 260px;
  gap: 16px;
}
.gallery-item {
  border-radius: var(--radius-lg);
  overflow: hidden;
  position: relative;
  cursor: pointer;
}
.gallery-item img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform 0.6s;
}
.gallery-item:hover img {
  transform: scale(1.08);
}
.gallery-item-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 50%, rgba(26,26,46,0.5) 100%);
  display: flex;
  align-items: flex-end;
  padding: 24px;
  opacity: 0;
  transition: opacity 0.4s;
}
.gallery-item:hover .gallery-item-overlay {
  opacity: 1;
}
.gallery-item-overlay span {
  color: #fff;
  font-size: 0.9rem;
  font-weight: 500;
}
/* 大图占2列 */
.gallery-item.wide {
  grid-column: span 2;
}
/* 大图占2行 */
.gallery-item.tall {
  grid-row: span 2;
}

/* 服务卡片增加图片区 */
.service-card-img {
  width: 100%; height: 180px;
  overflow: hidden;
  border-radius: var(--radius) var(--radius) 0 0;
  margin: -36px -28px 20px;
}
.service-card-img img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform 0.5s;
}
.service-card:hover .service-card-img img {
  transform: scale(1.05);
}

/* ============================================================
   RESPONSIVE - NEW SECTIONS
   ============================================================ */
@media (max-width: 1024px) {
  .projects-grid { grid-template-columns: repeat(2, 1fr); }
  .dept-grid { grid-template-columns: repeat(2, 1fr); }
  .experts-grid { grid-template-columns: repeat(2, 1fr); }
  .news-grid { grid-template-columns: repeat(2, 1fr); }
  .gallery-grid { grid-template-columns: repeat(2, 1fr); grid-template-rows: 220px 220px 220px; }
  .gallery-item.wide { grid-column: span 2; }
  .gallery-item.tall { grid-row: span 1; }
}

@media (max-width: 768px) {
  .projects-grid { grid-template-columns: 1fr; }
  .dept-grid { grid-template-columns: 1fr; }
  .experts-grid { grid-template-columns: 1fr 1fr; }
  .news-grid { grid-template-columns: 1fr; }
  .gallery-grid { grid-template-columns: 1fr 1fr; grid-template-rows: 200px 200px; }
  .gallery-item.wide { grid-column: span 2; }
}

@media (max-width: 480px) {
  .experts-grid { grid-template-columns: 1fr; }
  .gallery-grid { grid-template-columns: 1fr; grid-template-rows: auto; }
  .gallery-item.wide { grid-column: span 1; }
}

/* ============================================================
   TOAST NOTIFICATION
   ============================================================ */
.toast {
  position: fixed; bottom: 80px; left: 50%; transform: translateX(-50%) translateY(20px);
  background: var(--gray-900); border: 1px solid var(--border);
  color: #fff; font-size: 0.9rem;
  padding: 12px 24px; border-radius: 100px;
  box-shadow: var(--shadow-lg);
  opacity: 0; pointer-events: none;
  transition: opacity 0.3s, transform 0.3s;
  z-index: 2000;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }