/* ===== 设计令牌 Design Tokens ===== */
:root {
  --color-primary: #1B5E4B;       /* 深森林绿 - 主色 */
  --color-primary-dark: #0F3D30;  /* 深森林绿 - 深色 */
  --color-primary-light: #2E7D63; /* 深森林绿 - 浅色 */
  --color-primary-50: #F0F7F4;    /* 深森林绿 - 极浅 */
  --color-primary-100: #DCEAE4;
  --color-accent: #E8873A;        /* 暖橙 - 强调色/行动色 */
  --color-accent-dark: #D07028;
  --color-accent-light: #F5A962;
  --color-accent-50: #FEF6EE;

  --color-bg: #F7F5F0;            /* 暖米白背景 */
  --color-bg-alt: #F0EDE6;        /* 交替背景 */
  --color-bg-dark: #0F3D30;       /* 深色区块背景 */

  --color-text: #1F2937;          /* 主文字 - 深炭灰 */
  --color-text-secondary: #4B5563;/* 次要文字 */
  --color-text-muted: #6B7280;    /* 弱化文字 */
  --color-text-on-dark: #F7F5F0;  /* 深色底上的文字 */

  --color-border: #E5E1D8;
  --color-border-dark: #2E7D63;

  --font-serif: 'Noto Serif SC', 'Songti SC', serif;
  --font-sans: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', sans-serif;

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 20px;

  --shadow-sm: 0 1px 3px rgba(15, 61, 48, 0.08);
  --shadow-md: 0 4px 12px rgba(15, 61, 48, 0.1);
  --shadow-lg: 0 12px 32px rgba(15, 61, 48, 0.12);

  --container-max: 1200px;
  --section-py: 96px;
  --section-py-mobile: 64px;
}

/* ===== Reset & Base ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }

/* ===== 版式 ===== */
h1, h2, h3, h4 {
  font-family: var(--font-serif);
  font-weight: 700;
  line-height: 1.3;
  color: var(--color-text);
}

h1 { font-size: clamp(32px, 5vw, 56px); font-weight: 900; }
h2 { font-size: clamp(28px, 3.5vw, 40px); }
h3 { font-size: clamp(20px, 2vw, 24px); }
h4 { font-size: 18px; }

.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

.section-label {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 16px;
}

.section-title {
  margin-bottom: 16px;
}

.section-subtitle {
  font-size: 17px;
  color: var(--color-text-secondary);
  max-width: 680px;
  line-height: 1.8;
}

.section-header {
  text-align: center;
  margin-bottom: 64px;
}

.section-header .section-subtitle {
  margin: 0 auto;
}

/* ===== 导航栏 ===== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(247, 245, 240, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(229, 225, 216, 0.6);
  transition: all 0.3s ease;
}

.navbar-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.nav-brand-mark {
  width: 40px;
  height: 40px;
  background: var(--color-primary);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
}

.nav-brand-text {
  font-family: var(--font-serif);
  font-size: 17px;
  font-weight: 700;
  color: var(--color-primary-dark);
  line-height: 1.2;
}

.nav-brand-sub {
  font-size: 11px;
  color: var(--color-text-muted);
  font-weight: 400;
  letter-spacing: 1px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav-links a {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: color 0.2s;
  position: relative;
}

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

.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 20px;
  background: var(--color-primary);
  color: white !important;
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 500;
  transition: all 0.2s;
}

.nav-cta:hover {
  background: var(--color-primary-dark);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

/* 导航栏飞书在线咨询按钮 */
.nav-feishu {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 18px;
  background: #3370ff;
  color: #fff !important;
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 500;
  transition: all 0.2s;
}
.nav-feishu svg {
  width: 16px;
  height: 16px;
}
.nav-feishu:hover {
  background: #245bdb;
  transform: translateY(-1px);
  box-shadow: 0 6px 16px rgba(51, 112, 255, 0.35);
  color: #fff !important;
}

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

.nav-toggle span {
  width: 22px;
  height: 2px;
  background: var(--color-primary-dark);
  border-radius: 1px;
  transition: all 0.3s;
}

/* ===== Hero ===== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 120px 0 80px;
  background: linear-gradient(135deg, var(--color-primary-50) 0%, var(--color-bg) 50%, var(--color-accent-50) 100%);
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -20%;
  right: -10%;
  width: 500px;
  height: 500px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(27, 94, 75, 0.06) 0%, transparent 70%);
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -20%;
  left: -10%;
  width: 400px;
  height: 400px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(232, 135, 58, 0.06) 0%, transparent 70%);
  pointer-events: none;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 64px;
  align-items: center;
}

.hero-content { position: relative; z-index: 2; }

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: var(--color-primary-100);
  color: var(--color-primary-dark);
  border-radius: 100px;
  font-size: 13px;
  font-weight: 500;
  margin-bottom: 24px;
}

.hero-badge-dot {
  width: 6px;
  height: 6px;
  background: var(--color-primary);
  border-radius: 50%;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.hero-title {
  font-size: clamp(36px, 5.5vw, 60px);
  line-height: 1.15;
  color: var(--color-primary-dark);
  margin-bottom: 24px;
  letter-spacing: -0.5px;
}

.hero-title-accent {
  color: var(--color-accent);
  position: relative;
}

.hero-desc {
  font-size: 18px;
  color: var(--color-text-secondary);
  line-height: 1.8;
  margin-bottom: 32px;
  max-width: 560px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 28px;
  font-size: 15px;
  font-weight: 500;
  border-radius: var(--radius-md);
  transition: all 0.25s ease;
  cursor: pointer;
  white-space: nowrap;
}

.btn-primary {
  background: var(--color-primary);
  color: white;
  box-shadow: 0 4px 14px rgba(27, 94, 75, 0.25);
}

.btn-primary:hover {
  background: var(--color-primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(27, 94, 75, 0.35);
}

.btn-secondary {
  background: white;
  color: var(--color-primary);
  border: 1.5px solid var(--color-primary-100);
}

.btn-secondary:hover {
  background: var(--color-primary-50);
  border-color: var(--color-primary);
  transform: translateY(-2px);
}

.btn-accent {
  background: var(--color-accent);
  color: white;
  box-shadow: 0 4px 14px rgba(232, 135, 58, 0.3);
}

.btn-accent:hover {
  background: var(--color-accent-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(232, 135, 58, 0.4);
}

/* 飞书在线咨询按钮（飞书品牌蓝） */
.btn-feishu {
  background: #3370ff;
  color: #fff;
  text-decoration: none;
  box-shadow: 0 4px 14px rgba(51, 112, 255, 0.28);
}
.btn-feishu svg {
  width: 19px;
  height: 19px;
}
.btn-feishu:hover {
  background: #245bdb;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(51, 112, 255, 0.4);
  color: #fff;
}

.hero-audience {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 14px;
  color: var(--color-text-muted);
}

.hero-audience-chips {
  display: flex;
  gap: 8px;
}

.audience-chip {
  padding: 4px 12px;
  background: white;
  border: 1px solid var(--color-border);
  border-radius: 100px;
  font-size: 13px;
  color: var(--color-text-secondary);
}

.hero-visual {
  position: relative;
}

.hero-image-wrap {
  position: relative;
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  aspect-ratio: 4/3;
}

.hero-image-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-image-badge {
  position: absolute;
  bottom: 24px;
  left: 24px;
  right: 24px;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  padding: 16px 20px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  gap: 16px;
}

.hero-image-badge-icon {
  width: 44px;
  height: 44px;
  background: var(--color-primary-100);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: var(--color-primary);
}

.hero-image-badge-text h4 {
  font-size: 14px;
  margin-bottom: 2px;
  font-family: var(--font-sans);
  font-weight: 600;
}

.hero-image-badge-text p {
  font-size: 12px;
  color: var(--color-text-muted);
}

/* ===== 数据条 ===== */
.stats-bar {
  background: var(--color-primary-dark);
  color: white;
  padding: 48px 0;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
}

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

.stat-item:not(:last-child)::after {
  content: '';
  position: absolute;
  right: -16px;
  top: 50%;
  transform: translateY(-50%);
  width: 1px;
  height: 60%;
  background: rgba(255, 255, 255, 0.15);
}

.stat-number {
  font-family: var(--font-serif);
  font-size: clamp(28px, 3.5vw, 44px);
  font-weight: 700;
  color: var(--color-accent-light);
  margin-bottom: 8px;
  line-height: 1.1;
}

.stat-label {
  font-size: 14px;
  color: rgba(247, 245, 240, 0.85);
  line-height: 1.5;
}

/* ===== 痛点板块 ===== */
.pain-section {
  padding: var(--section-py) 0;
  background: var(--color-bg);
}

.pain-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-top: 56px;
}

.pain-card {
  background: white;
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.pain-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--color-accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s ease;
}

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

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

.pain-icon {
  width: 52px;
  height: 52px;
  background: var(--color-accent-50);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  color: var(--color-accent);
}

.pain-card h3 {
  font-size: 18px;
  margin-bottom: 12px;
  font-family: var(--font-sans);
  font-weight: 600;
}

.pain-card p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.pain-conclusion {
  margin-top: 48px;
  padding: 28px 36px;
  background: var(--color-primary-50);
  border-left: 4px solid var(--color-primary);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.pain-conclusion-text {
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 600;
  color: var(--color-primary-dark);
  line-height: 1.6;
}

/* ===== 科学原理 ===== */
.science-section {
  padding: var(--section-py) 0;
  background: var(--color-bg-alt);
  position: relative;
  overflow: hidden;
}

.science-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}

.science-text h2 {
  color: var(--color-primary-dark);
  margin-bottom: 24px;
}

.science-text > p {
  font-size: 16px;
  color: var(--color-text-secondary);
  margin-bottom: 32px;
  line-height: 1.8;
}

.science-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.science-list li {
  display: flex;
  gap: 16px;
  padding: 16px 20px;
  background: white;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s;
}

.science-list li:hover {
  transform: translateX(4px);
}

.science-list-icon {
  width: 36px;
  height: 36px;
  background: #FEF2F2;
  color: #DC2626;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.science-list-content h4 {
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 4px;
}

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

/* 恶性循环图 */
.vicious-cycle {
  position: relative;
  width: 100%;
  aspect-ratio: 1;
  max-width: 480px;
  margin: 0 auto;
}

.cycle-center {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 140px;
  height: 140px;
  background: white;
  border-radius: 50%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-lg);
  z-index: 3;
}

.cycle-center-label {
  font-size: 12px;
  color: var(--color-text-muted);
  margin-bottom: 4px;
}

.cycle-center-text {
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: 700;
  color: #DC2626;
  line-height: 1.2;
  text-align: center;
}

.cycle-node {
  position: absolute;
  width: 110px;
  height: 110px;
  background: white;
  border-radius: 50%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md);
  z-index: 2;
  text-align: center;
  padding: 8px;
  transition: all 0.3s ease;
}

.cycle-node:hover {
  transform: scale(1.1);
  box-shadow: var(--shadow-lg);
}

.cycle-node-icon {
  color: #DC2626;
  margin-bottom: 4px;
}

.cycle-node-text {
  font-size: 12px;
  font-weight: 600;
  color: var(--color-text);
  line-height: 1.3;
}

.cycle-ring {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 85%;
  height: 85%;
  border: 2px dashed rgba(220, 38, 38, 0.2);
  border-radius: 50%;
  animation: rotateRing 30s linear infinite;
}

@keyframes rotateRing {
  from { transform: translate(-50%, -50%) rotate(0deg); }
  to { transform: translate(-50%, -50%) rotate(360deg); }
}

.cycle-arrow {
  position: absolute;
  top: 50%;
  left: 50%;
  color: #DC2626;
  opacity: 0.6;
  font-size: 20px;
}

/* ===== 核心服务 ===== */
.services-section {
  padding: var(--section-py) 0;
  background: var(--color-bg);
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}

.service-card {
  background: white;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
  transition: all 0.3s ease;
  display: flex;
  flex-direction: column;
}

.service-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary-100);
}

.service-card-image {
  height: 200px;
  overflow: hidden;
  position: relative;
}

.service-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.service-card:hover .service-card-image img {
  transform: scale(1.05);
}

.service-card-tag {
  position: absolute;
  top: 16px;
  left: 16px;
  padding: 4px 12px;
  background: var(--color-primary);
  color: white;
  font-size: 12px;
  font-weight: 500;
  border-radius: 100px;
}

.service-card-tag.accent {
  background: var(--color-accent);
}

.service-card-body {
  padding: 28px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.service-card h3 {
  font-size: 20px;
  margin-bottom: 12px;
  font-family: var(--font-sans);
  font-weight: 600;
  color: var(--color-primary-dark);
}

.service-card-desc {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-bottom: 20px;
  line-height: 1.7;
  flex: 1;
}

.service-card-features {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.service-card-features li {
  font-size: 13px;
  color: var(--color-text-secondary);
  display: flex;
  align-items: flex-start;
  gap: 8px;
}

.service-card-features li::before {
  content: '';
  width: 6px;
  height: 6px;
  background: var(--color-primary);
  border-radius: 50%;
  margin-top: 7px;
  flex-shrink: 0;
}

/* ===== TNR 流程 ===== */
.tnr-section {
  padding: var(--section-py) 0;
  background: linear-gradient(180deg, var(--color-bg) 0%, var(--color-primary-50) 100%);
}

.tnr-steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  margin: 56px 0 64px;
  position: relative;
}

.tnr-step {
  text-align: center;
  padding: 40px 28px;
  background: white;
  position: relative;
  border: 1px solid var(--color-border);
}

.tnr-step:first-child {
  border-radius: var(--radius-lg) 0 0 var(--radius-lg);
}

.tnr-step:last-child {
  border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
}

.tnr-step:not(:last-child) {
  border-right: none;
}

.tnr-step-num {
  font-family: var(--font-serif);
  font-size: 64px;
  font-weight: 900;
  color: var(--color-primary-100);
  line-height: 1;
  margin-bottom: 8px;
}

.tnr-step-title {
  font-family: var(--font-serif);
  font-size: 28px;
  font-weight: 700;
  color: var(--color-primary-dark);
  margin-bottom: 4px;
}

.tnr-step-en {
  font-size: 13px;
  color: var(--color-accent);
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 20px;
  font-weight: 500;
}

.tnr-step-desc {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.8;
  text-align: left;
}

.tnr-step-icon {
  width: 64px;
  height: 64px;
  background: var(--color-primary-50);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  color: var(--color-primary);
}

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

.threshold-card {
  background: white;
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  text-align: center;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
  position: relative;
}

.threshold-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 4px;
  background: var(--color-accent);
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
}

.threshold-number {
  font-family: var(--font-serif);
  font-size: 48px;
  font-weight: 900;
  color: var(--color-primary);
  margin-bottom: 8px;
  line-height: 1.1;
}

.threshold-label {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 8px;
}

.threshold-desc {
  font-size: 13px;
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* ===== 权威背书 ===== */
.case-section {
  padding: var(--section-py) 0;
  background: var(--color-bg);
}

.case-groups {
  display: flex;
  flex-direction: column;
  gap: 72px;
}

.case-group {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 48px;
  align-items: start;
}

.case-group-label {
  position: sticky;
  top: 100px;
}

.case-group-label h3 {
  font-family: var(--font-serif);
  font-size: 24px;
  color: var(--color-primary-dark);
  margin-bottom: 8px;
}

.case-group-label p {
  font-size: 14px;
  color: var(--color-text-muted);
  line-height: 1.6;
}

.case-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.case-card {
  background: white;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
  transition: all 0.3s;
}

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

.case-card-image {
  height: 140px;
  overflow: hidden;
}

.case-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.case-card-body {
  padding: 20px;
}

.case-card-place {
  font-size: 11px;
  color: var(--color-accent);
  font-weight: 500;
  letter-spacing: 1px;
  margin-bottom: 6px;
}

.case-card-title {
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--color-text);
}

.case-card-desc {
  font-size: 13px;
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* 案例卡片外链（点击跳转官方报道） */
a.case-card-link {
  display: block;
  color: inherit;
  text-decoration: none;
  cursor: pointer;
}
.case-card-link .case-card-image {
  position: relative;
}
.case-card-link .case-card-image img {
  transition: transform 0.5s ease;
}
.case-card-link:hover .case-card-image img {
  transform: scale(1.06);
}
.case-card-badge {
  position: absolute;
  top: 10px;
  right: 10px;
  z-index: 2;
  font-size: 11px;
  font-weight: 600;
  color: #fff;
  background: rgba(0, 0, 0, 0.42);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  padding: 4px 10px;
  border-radius: 999px;
  white-space: nowrap;
  transition: background 0.3s;
}
.case-card-link:hover .case-card-badge {
  background: var(--color-accent);
}
.case-card-more {
  display: inline-block;
  margin-top: 12px;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-accent);
  transition: gap 0.3s;
}
.case-card-link:hover .case-card-more {
  text-decoration: underline;
}

/* 上海本地案例表格 */
.shanghai-cases {
  background: white;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
}

.shanghai-cases-header {
  padding: 24px 28px;
  background: var(--color-primary);
  color: white;
}

.shanghai-cases-header h3 {
  color: white;
  font-size: 18px;
  margin-bottom: 4px;
}

.shanghai-cases-header p {
  font-size: 13px;
  opacity: 0.85;
}

/* 固定约 10 行高度、表体内部滚动，表头吸顶 */
.shanghai-table-scroll {
  max-height: 636px;
  overflow-y: auto;
  overflow-x: hidden;
  scroll-behavior: smooth;
}

.shanghai-table-scroll::-webkit-scrollbar {
  width: 10px;
}
.shanghai-table-scroll::-webkit-scrollbar-track {
  background: var(--color-primary-50);
}
.shanghai-table-scroll::-webkit-scrollbar-thumb {
  background: var(--color-border-dark, #c7d2c9);
  border-radius: 8px;
  border: 2px solid var(--color-primary-50);
}
.shanghai-table-scroll::-webkit-scrollbar-thumb:hover {
  background: var(--color-primary);
}
.shanghai-table-scroll {
  scrollbar-width: thin;
  scrollbar-color: var(--color-border-dark, #c7d2c9) var(--color-primary-50);
}

.shanghai-table {
  width: 100%;
  border-collapse: collapse;
}

.shanghai-table th {
  position: sticky;
  top: 0;
  z-index: 2;
  padding: 14px 24px;
  text-align: left;
  font-size: 12px;
  font-weight: 600;
  color: var(--color-text-muted);
  background: var(--color-primary-50);
  border-bottom: 1px solid var(--color-border);
  letter-spacing: 0.5px;
  box-shadow: inset 0 -1px 0 var(--color-border);
}

.shanghai-table td {
  padding: 16px 24px;
  font-size: 14px;
  color: var(--color-text-secondary);
  border-bottom: 1px solid var(--color-border);
}

.shanghai-table tr:last-child td {
  border-bottom: none;
}

.shanghai-table tr:hover td {
  background: var(--color-primary-50);
}

/* 行政区分组标题行 */
.shanghai-table tr.district-row td {
  padding: 10px 24px;
  background: var(--color-primary-100, #e3ede6);
  border-bottom: 1px solid var(--color-border);
  border-top: 2px solid var(--color-primary);
}
.shanghai-table tr.district-row:first-child td { border-top: none; }
.shanghai-table tr.district-row:hover td { background: var(--color-primary-100, #e3ede6); }
.shanghai-table .district-tag {
  font-size: 13.5px;
  font-weight: 700;
  color: var(--color-primary-dark);
  letter-spacing: 0.5px;
}
.shanghai-table .district-count {
  margin-left: 10px;
  padding: 1px 9px;
  font-size: 11px;
  font-weight: 600;
  color: var(--color-primary);
  background: #fff;
  border-radius: 999px;
  border: 1px solid var(--color-primary);
}

.shanghai-table .place-cell {
  font-weight: 600;
  color: var(--color-primary-dark);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 4px;
}
.shanghai-table .street-name {
  font-size: 11.5px;
  font-weight: 500;
  color: var(--color-text-muted);
  letter-spacing: 0.3px;
}

.shanghai-table .place-link {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  color: var(--color-primary-dark);
  text-decoration: none;
  border-bottom: 1px dashed var(--color-primary);
  transition: color 0.2s ease;
}
.shanghai-table .place-link svg { opacity: 0.6; transition: opacity 0.2s ease; }
.shanghai-table .place-link:hover { color: var(--color-primary); }
.shanghai-table .place-link:hover svg { opacity: 1; }

.shanghai-table .tag {
  display: inline-block;
  padding: 2px 8px;
  background: var(--color-accent-50);
  color: var(--color-accent-dark);
  font-size: 12px;
  border-radius: 4px;
  font-weight: 500;
}

/* ===== 成效数据 ===== */
.data-section {
  padding: var(--section-py) 0;
  background: var(--color-bg-dark);
  color: white;
}

.data-section .section-label {
  color: var(--color-accent-light);
}

.data-section .section-title {
  color: white;
}

.data-section .section-subtitle {
  color: rgba(247, 245, 240, 0.75);
}

.data-cards {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-bottom: 56px;
}

.data-card {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  backdrop-filter: blur(10px);
  transition: all 0.3s;
}

.data-card:hover {
  background: rgba(255, 255, 255, 0.1);
  transform: translateY(-4px);
  border-color: rgba(232, 135, 58, 0.3);
}

.data-card-number {
  font-family: var(--font-serif);
  font-size: 42px;
  font-weight: 900;
  color: var(--color-accent-light);
  line-height: 1.1;
  margin-bottom: 4px;
}

.data-card-unit {
  font-size: 20px;
  font-weight: 500;
}

.data-card-label {
  font-size: 13px;
  color: rgba(247, 245, 240, 0.75);
  margin-bottom: 4px;
  line-height: 1.4;
}

.data-card-source {
  font-size: 11px;
  color: rgba(247, 245, 240, 0.5);
}

.data-chart-row {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 32px;
  margin-bottom: 48px;
}

.chart-panel {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-lg);
  padding: 28px;
}

.chart-panel-title {
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 20px;
  color: rgba(247, 245, 240, 0.9);
}

.data-conclusion {
  padding: 28px 36px;
  background: rgba(232, 135, 58, 0.15);
  border-left: 4px solid var(--color-accent);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.data-conclusion p {
  font-size: 16px;
  color: rgba(247, 245, 240, 0.9);
  line-height: 1.8;
}

.data-conclusion strong {
  color: var(--color-accent-light);
  font-weight: 600;
}

/* ===== 三方共赢 ===== */
.value-section {
  padding: var(--section-py) 0;
  background: var(--color-bg);
}

.value-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  margin-top: 56px;
}

.value-card {
  background: white;
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
  transition: all 0.3s;
  position: relative;
  overflow: hidden;
}

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

.value-card-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 24px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--color-border);
}

.value-icon {
  width: 56px;
  height: 56px;
  background: var(--color-primary-50);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  flex-shrink: 0;
}

.value-card h3 {
  font-family: var(--font-sans);
  font-size: 18px;
  font-weight: 600;
  color: var(--color-primary-dark);
}

.value-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.value-list li {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  display: flex;
  align-items: flex-start;
  gap: 10px;
}

.value-list-icon {
  color: var(--color-primary);
  flex-shrink: 0;
  margin-top: 2px;
}

/* ===== 落地流程 ===== */
.process-section {
  padding: var(--section-py) 0;
  background: var(--color-bg-alt);
}

.process-parts {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-bottom: 64px;
}

.process-part {
  background: white;
  border-radius: var(--radius-md);
  padding: 20px;
  text-align: center;
  border: 1px solid var(--color-border);
  transition: all 0.3s;
}

.process-part:hover {
  border-color: var(--color-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.process-part-icon {
  width: 40px;
  height: 40px;
  background: var(--color-primary-50);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 12px;
  color: var(--color-primary);
}

.process-part h4 {
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 4px;
}

.process-part p {
  font-size: 12px;
  color: var(--color-text-muted);
  line-height: 1.5;
}

.six-steps {
  display: flex;
  align-items: stretch;
  margin-bottom: 72px;
  gap: 0;
}

.six-step {
  flex: 1;
  background: white;
  padding: 24px 16px;
  text-align: center;
  border: 1px solid var(--color-border);
  position: relative;
}

.six-step:first-child { border-radius: var(--radius-md) 0 0 var(--radius-md); }
.six-step:last-child { border-radius: 0 var(--radius-md) var(--radius-md) 0; }

.six-step:not(:last-child) { border-right: none; }

.six-step-num {
  font-family: var(--font-serif);
  font-size: 28px;
  font-weight: 900;
  color: var(--color-primary-100);
  margin-bottom: 8px;
}

.six-step-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text);
}

.timeline {
  position: relative;
  background: white;
  border-radius: var(--radius-lg);
  padding: 40px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
}

.timeline-title {
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: 700;
  color: var(--color-primary-dark);
  margin-bottom: 32px;
  text-align: center;
}

.timeline-track {
  display: flex;
  position: relative;
}

.timeline-track::before {
  content: '';
  position: absolute;
  top: 30px;
  left: 20px;
  right: 20px;
  height: 3px;
  background: var(--color-primary-100);
  border-radius: 2px;
}

.timeline-phase {
  flex: 1;
  position: relative;
  padding: 0 16px;
  text-align: center;
}

.timeline-dot {
  width: 20px;
  height: 20px;
  background: var(--color-primary);
  border-radius: 50%;
  margin: 21px auto 20px;
  position: relative;
  z-index: 1;
  border: 3px solid white;
  box-shadow: 0 0 0 2px var(--color-primary);
}

.timeline-phase-num {
  font-size: 12px;
  font-weight: 600;
  color: var(--color-accent);
  margin-bottom: 4px;
  letter-spacing: 1px;
}

.timeline-phase-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 8px;
}

.timeline-phase-desc {
  font-size: 12px;
  color: var(--color-text-muted);
  line-height: 1.6;
}

.acceptance-table {
  margin-top: 48px;
  background: white;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
}

.acceptance-table-header {
  padding: 20px 28px;
  background: var(--color-primary);
  color: white;
}

.acceptance-table-header h3 {
  color: white;
  font-size: 17px;
  font-family: var(--font-sans);
}

.acceptance-table table {
  width: 100%;
  border-collapse: collapse;
}

.acceptance-table th,
.acceptance-table td {
  padding: 14px 24px;
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

.acceptance-table th {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-text);
  background: var(--color-primary-50);
}

.acceptance-table td {
  font-size: 14px;
  color: var(--color-text-secondary);
}

.acceptance-table tr:last-child td { border-bottom: none; }

.acceptance-table .metric {
  font-weight: 600;
  color: var(--color-primary-dark);
}

.acceptance-table .target {
  color: var(--color-accent-dark);
  font-weight: 600;
}

/* ===== 紧迫性 ===== */
.urgency-section {
  padding: var(--section-py) 0;
  background: linear-gradient(135deg, #FEF2F2 0%, var(--color-accent-50) 100%);
}

.urgency-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}

.urgency-text h2 {
  color: var(--color-primary-dark);
  margin-bottom: 24px;
}

.urgency-text > p {
  font-size: 16px;
  color: var(--color-text-secondary);
  margin-bottom: 32px;
  line-height: 1.8;
}

.urgency-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-bottom: 32px;
}

.urgency-stat {
  background: white;
  border-radius: var(--radius-md);
  padding: 20px;
  box-shadow: var(--shadow-sm);
  border-left: 3px solid var(--color-accent);
}

.urgency-stat-number {
  font-family: var(--font-serif);
  font-size: 28px;
  font-weight: 900;
  color: var(--color-accent-dark);
  line-height: 1.1;
  margin-bottom: 4px;
}

.urgency-stat-label {
  font-size: 13px;
  color: var(--color-text-secondary);
  line-height: 1.4;
}

.cost-calc {
  background: white;
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--color-border);
}

.cost-calc-title {
  font-family: var(--font-sans);
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 20px;
  color: var(--color-primary-dark);
  display: flex;
  align-items: center;
  gap: 8px;
}

.cost-compare {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 16px;
  align-items: center;
}

.cost-item {
  text-align: center;
  padding: 20px;
  border-radius: var(--radius-md);
}

.cost-item.now {
  background: var(--color-primary-50);
}

.cost-item.later {
  background: #FEF2F2;
}

.cost-item-label {
  font-size: 13px;
  color: var(--color-text-muted);
  margin-bottom: 8px;
}

.cost-item-number {
  font-family: var(--font-serif);
  font-size: 32px;
  font-weight: 900;
  line-height: 1.1;
  margin-bottom: 4px;
}

.cost-item.now .cost-item-number { color: var(--color-primary); }
.cost-item.later .cost-item-number { color: #DC2626; }

.cost-item-sub {
  font-size: 12px;
  color: var(--color-text-muted);
}

.cost-arrow {
  color: #DC2626;
  font-size: 24px;
  text-align: center;
}

.cost-note {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px dashed var(--color-border);
  font-size: 13px;
  color: var(--color-text-secondary);
  text-align: center;
  line-height: 1.6;
}

.cost-note strong {
  color: var(--color-accent-dark);
  font-weight: 600;
}

/* ===== 关于我们 ===== */
.about-section {
  padding: var(--section-py) 0;
  background: var(--color-bg);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 64px;
  align-items: center;
}

.about-image {
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  aspect-ratio: 4/5;
}

.about-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.about-content h2 {
  margin-bottom: 24px;
  color: var(--color-primary-dark);
}

.about-content > p {
  font-size: 16px;
  color: var(--color-text-secondary);
  line-height: 1.9;
  margin-bottom: 32px;
}

.about-features {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.about-feature {
  display: flex;
  gap: 14px;
}

.about-feature-icon {
  width: 44px;
  height: 44px;
  background: var(--color-primary-50);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  flex-shrink: 0;
}

.about-feature-text h4 {
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 4px;
}

.about-feature-text p {
  font-size: 13px;
  color: var(--color-text-muted);
  line-height: 1.5;
}

.brand-values {
  display: flex;
  gap: 16px;
  margin-top: 32px;
  padding-top: 32px;
  border-top: 1px solid var(--color-border);
}

.brand-value {
  flex: 1;
  text-align: center;
}

.brand-value-word {
  font-family: var(--font-serif);
  font-size: 24px;
  font-weight: 700;
  color: var(--color-primary);
}

.brand-value-dot {
  color: var(--color-accent);
  margin: 0 8px;
}

/* ===== 联系咨询 ===== */
.contact-section {
  padding: var(--section-py) 0;
  background: linear-gradient(180deg, var(--color-primary-dark) 0%, var(--color-bg-dark) 100%);
  color: white;
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 64px;
}

.contact-info h2 {
  color: white;
  margin-bottom: 16px;
}

.contact-info > p {
  font-size: 16px;
  color: rgba(247, 245, 240, 0.75);
  line-height: 1.8;
  margin-bottom: 32px;
}

.contact-details {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.contact-detail {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.contact-detail-icon {
  width: 44px;
  height: 44px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-accent-light);
  flex-shrink: 0;
}

.contact-detail-text h4 {
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 600;
  color: white;
  margin-bottom: 4px;
}

.contact-detail-text p {
  font-size: 14px;
  color: rgba(247, 245, 240, 0.7);
}

.contact-form {
  background: white;
  border-radius: var(--radius-xl);
  padding: 36px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.2);
}

.contact-form-title {
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: 700;
  color: var(--color-primary-dark);
  margin-bottom: 8px;
}

.contact-form-desc {
  font-size: 14px;
  color: var(--color-text-muted);
  margin-bottom: 28px;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: 13px;
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: 8px;
}

.form-group label .required {
  color: #DC2626;
  margin-left: 2px;
}

.form-control {
  width: 100%;
  padding: 12px 16px;
  font-size: 14px;
  font-family: inherit;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg);
  transition: all 0.2s;
  color: var(--color-text);
}

.form-control:focus {
  outline: none;
  border-color: var(--color-primary);
  background: white;
  box-shadow: 0 0 0 3px rgba(27, 94, 75, 0.1);
}

textarea.form-control {
  resize: vertical;
  min-height: 100px;
  line-height: 1.6;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.form-select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%236B7280' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  padding-right: 36px;
}

.form-submit {
  width: 100%;
  padding: 14px;
  font-size: 15px;
  font-weight: 500;
}

/* ===== 页脚 ===== */
.footer {
  background: #0A2820;
  color: rgba(247, 245, 240, 0.7);
  padding: 64px 0 32px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}

.footer-brand {
  max-width: 320px;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

.footer-logo-mark {
  width: 44px;
  height: 44px;
  background: var(--color-primary);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
}

.footer-logo-text {
  font-family: var(--font-serif);
  font-size: 16px;
  font-weight: 700;
  color: white;
  line-height: 1.3;
}

.footer-brand p {
  font-size: 13px;
  line-height: 1.7;
  margin-bottom: 16px;
}

.footer-brand-tags {
  display: flex;
  gap: 8px;
  margin-bottom: 20px;
}

.footer-contact-info {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding-top: 16px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-contact-info p {
  font-size: 13px;
  color: rgba(247, 245, 240, 0.7);
  margin: 0;
  line-height: 1.6;
}

.footer-contact-info a:hover {
  color: white;
}

.footer-tag {
  padding: 4px 10px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: 4px;
  font-size: 12px;
  color: var(--color-accent-light);
}

.footer-col h4 {
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 600;
  color: white;
  margin-bottom: 20px;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-links a {
  font-size: 13px;
  color: rgba(247, 245, 240, 0.6);
  transition: color 0.2s;
}

.footer-links a:hover {
  color: white;
}

.footer-links a.footer-feishu {
  color: #7ea6ff;
  font-weight: 600;
}
.footer-links a.footer-feishu:hover {
  color: #a9c5ff;
  text-decoration: underline;
}

.footer-bottom {
  padding-top: 32px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
}

.footer-bottom-right {
  display: flex;
  gap: 24px;
}

.footer-bottom-right a {
  color: rgba(247, 245, 240, 0.5);
  transition: color 0.2s;
}

.footer-bottom-right a:hover {
  color: white;
}

/* ===== 返回顶部 ===== */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 48px;
  height: 48px;
  background: var(--color-primary);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-lg);
  cursor: pointer;
  transition: all 0.3s;
  opacity: 0;
  visibility: hidden;
  z-index: 99;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  background: var(--color-primary-dark);
  transform: translateY(-3px);
}

/* ===== 响应式 ===== */
@media (max-width: 992px) {
  /* 中屏即切换汉堡菜单，避免导航文字被挤换行 */
  .nav-links {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    z-index: 101;
    background: var(--color-bg);
    flex-direction: column;
    align-items: stretch;
    padding: 20px 24px 24px;
    border-bottom: 1px solid var(--color-border);
    box-shadow: 0 16px 32px rgba(15, 61, 48, 0.12);
    gap: 16px;
  }
  .nav-links.open { display: flex; }
  .nav-toggle { display: flex; }
  .nav-links li:last-child { width: 100%; }
  .nav-links .nav-cta {
    width: 100%;
    justify-content: center;
    padding: 13px 18px;
    font-size: 15px;
  }

  .hero-grid,
  .science-grid,
  .about-grid,
  .contact-grid,
  .urgency-grid {
    grid-template-columns: 1fr;
    gap: 48px;
  }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
  }

  .stat-item:nth-child(2)::after { display: none; }

  .pain-grid,
  .services-grid,
  .case-cards,
  .value-grid,
  .data-cards {
    grid-template-columns: repeat(2, 1fr);
  }

  .tnr-steps,
  .tnr-thresholds {
    grid-template-columns: 1fr;
  }

  .tnr-step:first-child { border-radius: var(--radius-lg) var(--radius-lg) 0 0; }
  .tnr-step:last-child { border-radius: 0 0 var(--radius-lg) var(--radius-lg); }
  .tnr-step:not(:last-child) { border-right: 1px solid var(--color-border); border-bottom: none; }

  .case-group {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .case-group-label { position: static; }

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

  .data-chart-row {
    grid-template-columns: 1fr;
  }

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

@media (max-width: 768px) {
  :root {
    --section-py: 64px;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    z-index: 101;
    background: var(--color-bg);
    flex-direction: column;
    align-items: stretch;
    padding: 20px 24px 24px;
    border-bottom: 1px solid var(--color-border);
    box-shadow: 0 16px 32px rgba(15, 61, 48, 0.12);
    gap: 16px;
  }

  .nav-links.open { display: flex; }
  .nav-toggle { display: flex; }

  .nav-links .nav-feishu-li,
  .nav-links li:last-child {
    width: 100%;
  }
  .nav-links .nav-feishu,
  .nav-links .nav-cta {
    width: 100%;
    justify-content: center;
    padding: 13px 18px;
    font-size: 15px;
  }

  .pain-grid,
  .services-grid,
  .case-cards,
  .value-grid,
  .data-cards,
  .about-features {
    grid-template-columns: 1fr;
  }

  .urgency-stats {
    grid-template-columns: 1fr;
  }

  .stats-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .stat-item::after { display: none !important; }

  .six-steps {
    flex-direction: column;
  }

  .six-step:first-child { border-radius: var(--radius-md) var(--radius-md) 0 0; }
  .six-step:last-child { border-radius: 0 0 var(--radius-md) var(--radius-md); }
  .six-step:not(:last-child) { border-right: 1px solid var(--color-border); border-bottom: none; }

  .timeline-track {
    flex-direction: column;
    gap: 24px;
  }

  .timeline-track::before {
    top: 0;
    bottom: 0;
    left: 30px;
    right: auto;
    width: 3px;
    height: auto;
  }

  .timeline-phase {
    text-align: left;
    padding-left: 60px;
  }

  .timeline-dot {
    position: absolute;
    left: 20px;
    top: 0;
    margin: 0;
  }

  .form-row { grid-template-columns: 1fr; }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .footer-bottom {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }

  .hero-actions { flex-direction: column; }
  .btn { width: 100%; }

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

  .contact-form { padding: 24px; }

  .vicious-cycle { max-width: 360px; }

  /* 手机端页脚联系信息优化 */
  .footer-contact-info {
    gap: 8px;
    padding-top: 12px;
  }

  .footer-contact-info p {
    font-size: 12px;
    line-height: 1.5;
  }

  .footer-brand {
    text-align: center;
  }

  .footer-brand-tags {
    justify-content: center;
  }

  .footer-contact-info p {
    text-align: center;
  }

  /* 手机端标题字体优化 */
  .section-title {
    font-size: 24px;
    line-height: 1.3;
  }

  .section-subtitle {
    font-size: 14px;
    line-height: 1.7;
  }

  /* 手机端卡片内边距优化 */
  .case-card-body {
    padding: 16px;
  }

  .case-card-title {
    font-size: 15px;
    line-height: 1.4;
  }

  .case-card-desc {
    font-size: 13px;
    line-height: 1.6;
  }
}

@media (max-width: 480px) {
  .cycle-node { width: 90px; height: 90px; }
  .cycle-node-text { font-size: 11px; }
  .cycle-center { width: 110px; height: 110px; }
  .cycle-center-text { font-size: 18px; }

  /* 超小屏幕优化 */
  .container {
    padding-left: 16px;
    padding-right: 16px;
  }

  .page-hero-title {
    font-size: 24px;
  }

  .btn {
    font-size: 14px;
    padding: 12px 20px;
  }

  .footer-logo-text {
    font-size: 14px;
  }
}

/* ========================================
   卡片网格等高修复
   FadeIn / Stagger 动画组件会给每张卡片额外包一层 div，
   grid 只把包裹层拉等高，内部卡片仍按内容高度，导致同排卡片底部参差。
   这里让包裹层成为 flex 容器、卡片撑满，保证同排卡片外框严格等高。
   ======================================== */
.pain-grid > div,
.services-grid > div,
.case-cards > div,
.value-grid > div,
.about-features > div {
  display: flex;
}

.pain-grid > div > .pain-card,
.services-grid > div > .service-card,
.case-cards > div > .case-card,
.value-grid > div > .value-card,
.about-features > div > .about-feature {
  width: 100%;
  height: 100%;
}

/* 等高后让卡片内部按列布局，正文区撑开、内容顶部对齐 */
.case-cards > div > .case-card,
.value-grid > div > .value-card {
  display: flex;
  flex-direction: column;
}
.case-cards > div > .case-card .case-card-body {
  flex: 1;
  display: flex;
  flex-direction: column;
}

/* ===== 案例页图表：来源图例 ===== */
.chart-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 14px;
  font-size: 12px;
  color: rgba(247, 245, 240, 0.7);
}
.chart-legend span { display: inline-flex; align-items: center; gap: 6px; }
.chart-legend .dot { width: 10px; height: 10px; border-radius: 3px; display: inline-block; }
.chart-legend .dot-research { background: #2E7D63; }
.chart-legend .dot-local { background: #E8873A; }
.chart-legend .dot-public { background: #7fa896; }

/* ===== 案例页右侧：关键成效分组面板 ===== */
.side-effect-panel { display: flex; flex-direction: column; gap: 24px; }
.side-effect-group-title {
  font-size: 12px;
  letter-spacing: 1px;
  color: rgba(247, 245, 240, 0.55);
  margin-bottom: 14px;
  font-weight: 600;
}
.side-effect-row { margin-bottom: 16px; }
.side-effect-row:last-child { margin-bottom: 0; }
.side-effect-meta {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 7px;
}
.side-effect-name { font-size: 13px; color: rgba(247, 245, 240, 0.82); }
.side-effect-num { font-size: 13px; font-weight: 700; color: #f0b27a; white-space: nowrap; }
.side-effect-track {
  height: 8px;
  border-radius: 100px;
  background: rgba(255, 255, 255, 0.08);
  overflow: hidden;
}
.side-effect-fill {
  height: 100%;
  border-radius: 100px;
  transition: width 1.2s cubic-bezier(0.22, 1, 0.36, 1);
}
.side-effect-fill.fill-green { background: linear-gradient(90deg, #2E7D63, #4a9c7d); }
.side-effect-fill.fill-orange { background: linear-gradient(90deg, #E8873A, #F5A962); }
.side-effect-note {
  font-size: 11px;
  line-height: 1.6;
  color: rgba(247, 245, 240, 0.45);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: 14px;
  margin: 0;
}

/* ===== 路由切换：新页面一次性淡入（无空白期） ===== */
.page-fade-in {
  animation: pageFadeIn 0.32s cubic-bezier(0.22, 1, 0.36, 1);
}
@keyframes pageFadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}
@media (prefers-reduced-motion: reduce) {
  .page-fade-in { animation: none; }
}