/* ===================== 基础变量（青绿色系）===================== */
:root {
  --primary: #0d9488;
  --primary-2: #14b8a6;
  --primary-3: #5eead4;
  --accent: #0ea5e9;

  --bg-light: #f0fdfa;
  --bg-light-2: #ffffff;
  --bg-dark: #042f2e;
  --bg-dark-2: #134e4a;
  --bg-card-dark: #0f766e;

  --gradient-primary: linear-gradient(135deg, #0d9488 0%, #14b8a6 50%, #5eead4 100%);
  --gradient-text: linear-gradient(90deg, #5eead4, #99f6e4, #ccfbf1);

  --text-main: #111827;
  --text-muted: #4b5563;
  --text-light: #f9fafb;
  --text-light-muted: #d1d5db;

  --border-color: #e5e7eb;
  --border-color-dark: #115e59;

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

  --shadow-sm: 0 4px 6px -1px rgba(13, 148, 136, 0.05), 0 2px 4px -1px rgba(13, 148, 136, 0.03);
  --shadow-md: 0 10px 15px -3px rgba(13, 148, 136, 0.1), 0 4px 6px -2px rgba(13, 148, 136, 0.05);
  --shadow-lg: 0 20px 25px -5px rgba(13, 148, 136, 0.1), 0 10px 10px -5px rgba(13, 148, 136, 0.04);
}

/* ===================== 全局重置 ===================== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family:'HYQiHei','Microsoft YaHei','PingFang SC','Noto Sans SC',sans-serif;
  color: var(--text-main);
  background-color: var(--bg-light-2);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  text-decoration: none;
  color: inherit;
}

ul {
  list-style: none;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.text-gradient {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  color: transparent;
}

.text-white {
  color: var(--text-light) !important;
}

/* ===================== 按钮样式 ===================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 24px;
  font-size: 16px;
  font-weight: 500;
  border-radius: var(--radius-sm);
  transition: all 0.3s ease;
  cursor: pointer;
  white-space: nowrap;
}

.btn-primary {
  background: var(--gradient-primary);
  color: white;
  border: none;
  box-shadow: 0 4px 14px rgba(13, 148, 136, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(13, 148, 136, 0.4);
}

.btn-ghost {
  background: transparent;
  color: var(--primary);
  border: 1px solid var(--primary);
}

.btn-ghost:hover {
  background: rgba(13, 148, 136, 0.05);
}

.btn-ghost-dark {
  background: transparent;
  color: white;
  border: 1px solid rgba(255, 255, 255, 0.3);
}

.btn-ghost-dark:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: white;
}

.btn-lg {
  padding: 14px 32px;
  font-size: 18px;
}

/* ===================== 导航栏 ===================== */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 72px;
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
  z-index: 100;
  transition: all 0.3s ease;
}

.nav.is-scrolled {
  background: rgba(255, 255, 255, 0.95);
  box-shadow: var(--shadow-sm);
}

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

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

.logo-mark {
  width: 36px;
  height: 36px;
  background: var(--gradient-primary);
  border-radius: 8px;
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 20px;
}

.logo-text {
  font-size: 20px;
  font-weight: 700;
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.logo-text small {
  font-size: 12px;
  font-weight: 400;
  color: var(--text-muted);
}

.nav-links {
  display: flex;
  gap: 32px;
}

.nav-links a {
  font-size: 15px;
  font-weight: 500;
  color: var(--text-muted);
  transition: color 0.3s;
}

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

.nav-cta {
  padding: 8px 20px;
  background: var(--primary);
  color: white;
  border-radius: var(--radius-sm);
  font-weight: 500;
  font-size: 14px;
  transition: background 0.3s;
}

.nav-cta:hover {
  background: var(--primary-2);
}

/* ===================== 区块公共 ===================== */
.section {
  padding: 100px 0;
}

.section-light {
  background: var(--bg-light-2);
}

.section-gray {
  background: var(--bg-light);
}

.section-dark {
  background: var(--bg-dark);
  color: var(--text-light);
}

.section-head {
  text-align: center;
  margin-bottom: 60px;
}

.section-title {
  font-size: 36px;
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 16px;
}

.section-sub {
  font-size: 18px;
  color: var(--text-muted);
  max-width: 800px;
  margin: 0 auto;
}

.section-dark .section-sub {
  color: var(--text-light-muted);
}

.feature-tag {
  display: inline-block;
  padding: 4px 12px;
  background: rgba(13, 148, 136, 0.1);
  color: var(--primary);
  border-radius: 20px;
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 16px;
}

.feature-tag-light {
  background: rgba(255, 255, 255, 0.1);
  color: var(--primary-3);
}

/* ===================== Hero 首屏 ===================== */
.hero {
  position: relative;
  padding: 180px 0 100px;
  background: var(--bg-light);
  overflow: hidden;
  min-height: 100vh;
  display: flex;
  align-items: center;
}

.hero-bg {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(circle at top right, rgba(13, 148, 136, 0.1) 0%, transparent 40%),
              radial-gradient(circle at bottom left, rgba(14, 165, 233, 0.05) 0%, transparent 40%);
  z-index: 1;
}

.hero-inner {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 60px;
  align-items: center;
}

.hero-eyebrow {
  display: inline-block;
  padding: 6px 16px;
  background: rgba(13, 148, 136, 0.1);
  color: var(--primary);
  border-radius: 24px;
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 24px;
}

.hero-title {
  font-size: 40px;
  font-weight: 900;
  line-height: 1.2;
  margin-bottom: 24px;
  letter-spacing: -0.02em;
}

.hero-sub {
  font-size: 18px;
  color: var(--text-muted);
  margin-bottom: 40px;
  max-width: 600px;
}

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

.hero-visual {
  position: relative;
}

.hero-visual img {
  width: 100%;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
}

/* ===================== 核心价值 ===================== */
.value-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.value-card {
  background: white;
  padding: 32px 24px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
  transition: transform 0.3s, box-shadow 0.3s;
}

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

.value-ic {
  width: 56px;
  height: 56px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  color: white;
}

.value-ic svg {
  width: 28px;
  height: 28px;
}

.value-ic-1 { background: linear-gradient(135deg, #0ea5e9, #0284c7); }
.value-ic-2 { background: linear-gradient(135deg, #0d9488, #0f766e); }
.value-ic-3 { background: linear-gradient(135deg, #8b5cf6, #7c3aed); }
.value-ic-4 { background: linear-gradient(135deg, #f59e0b, #d97706); }

.value-card h3 {
  font-size: 20px;
  margin-bottom: 12px;
}

.value-card p {
  color: var(--text-muted);
  font-size: 14px;
}

/* ===================== 图文双栏 ===================== */
.feature-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  margin-bottom: 80px;
}

.feature-row:last-child {
  margin-bottom: 0;
}

.feature-row-reverse {
  direction: rtl;
}

.feature-row-reverse > * {
  direction: ltr;
}

.feature-text h3 {
  font-size: 32px;
  font-weight: 800;
  margin-bottom: 20px;
  line-height: 1.3;
}

.feature-text p {
  font-size: 16px;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.section-dark .feature-text p {
  color: var(--text-light-muted);
}

.feature-list {
  margin-top: 24px;
}

.feature-list li {
  position: relative;
  padding-left: 28px;
  margin-bottom: 16px;
  font-size: 16px;
}

.feature-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 16px;
  height: 16px;
  background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%230d9488' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='20 6 9 17 4 12'%3E%3C/polyline%3E%3C/svg%3E") no-repeat center;
}

.section-dark .feature-list li::before {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%235eead4' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='20 6 9 17 4 12'%3E%3C/polyline%3E%3C/svg%3E");
}

.feature-figure img {
  width: 100%;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  background: white;
}

.section-dark .feature-figure img {
  background: var(--bg-dark-2);
  box-shadow: 0 10px 25px rgba(0,0,0,0.3);
}

/* ===================== 场景轮播 / Tab (CSS实现) ===================== */
.scenarios-wrap {
  margin-top: 40px;
}

.scenario-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 40px;
}

.scenario-card {
  background: var(--bg-dark-2);
  border-radius: var(--radius-md);
  padding: 32px 24px;
  border: 1px solid var(--border-color-dark);
  transition: all 0.3s;
}

.scenario-card:hover {
  transform: translateY(-5px);
  background: var(--bg-card-dark);
  border-color: var(--primary-3);
}

.scenario-tag {
  display: inline-block;
  padding: 4px 12px;
  background: rgba(94, 234, 212, 0.1);
  color: var(--primary-3);
  border-radius: 4px;
  font-size: 13px;
  margin-bottom: 16px;
}

.scenario-card h3 {
  font-size: 20px;
  margin-bottom: 12px;
  color: white;
}

.scenario-card p {
  font-size: 14px;
  color: var(--text-light-muted);
}

/* ===================== 六宫格卡片 ===================== */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.grid-card {
  background: white;
  border-radius: var(--radius-md);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
  text-align: center;
}

.grid-card h4 {
  font-size: 18px;
  margin: 16px 0 12px;
  color: var(--text-main);
}

.grid-card p {
  font-size: 14px;
  color: var(--text-muted);
}

.card-img-placeholder {
  width: 100%;
  aspect-ratio: 16/9;
  background: var(--bg-light);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: 14px;
  overflow: hidden;
}

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

/* ===================== 底部 CTA ===================== */
.cta {
  padding: 100px 0;
  background: var(--bg-dark);
  position: relative;
  overflow: hidden;
  text-align: center;
}

.cta::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(circle at center, rgba(13, 148, 136, 0.2) 0%, transparent 60%);
}

.cta-inner {
  position: relative;
  z-index: 2;
}

.cta-title {
  font-size: 40px;
  font-weight: 800;
  color: white;
  margin-bottom: 24px;
}

.cta-sub {
  font-size: 18px;
  color: var(--text-light-muted);
  margin-bottom: 40px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.cta-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
}

/* ===================== 页脚 ===================== */
.footer {
  background: #021f1e;
  padding: 40px 0;
  color: var(--text-light-muted);
}

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

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

.footer-name {
  font-size: 18px;
  font-weight: 700;
  color: white;
}

.footer-en {
  font-size: 12px;
}

.footer-copy {
  font-size: 14px;
}

/* ===================== 响应式 ===================== */
@media (max-width: 992px) {
  .hero-inner, .feature-row {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .hero-text {
    text-align: center;
  }

  .hero-sub {
    margin-left: auto;
    margin-right: auto;
  }

  .hero-actions {
    justify-content: center;
  }

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

  .scenario-grid, .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }

  .hero-title {
    font-size: 36px;
  }

  .section-title {
    font-size: 28px;
  }

  .value-grid, .scenario-grid, .grid-3 {
    grid-template-columns: 1fr;
  }

  .footer-inner {
    flex-direction: column;
    gap: 20px;
    text-align: center;
  }
}

/* ===================== 配图占位提示 ===================== */
.img-placeholder-wrapper {
  width: 100%;
  margin-top: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.img-caption {
  display: block;
  text-align: center;
  width: max-content;
  max-width: 100%;
  margin: 0 auto;
  font-size: 12px;
  color: #8f6300;
  padding: 8px 16px;
  background: rgba(255,248,232,.86);
  border: 1px solid rgba(214,167,58,.65);
  border-radius: 999px;
  font-weight: 700;
}
.img-placeholder-wrapper-flat {
  margin-top: 0;
}
.img-caption-plain {
  padding: 6px 14px;
}