/* ================================
   深度好房 - 全局样式
   ================================ */

:root {
  /* 主色调 - Logo蓝 */
  --primary-dark: #0D47A1;
  --primary: #1565C0;
  --primary-light: #1976D2;
  --primary-lighter: #42A5F5;
  --primary-50: #E3F2FD;
  --primary-100: #BBDEFB;

  /* 点缀色 - 暖橙 */
  --accent: #FFA726;
  --accent-dark: #F57C00;
  --accent-light: #FFB74D;
  --accent-50: #FFF3E0;

  /* 辅助色 */
  --success: #4CAF50;
  --success-dark: #388E3C;
  --success-50: #E8F5E9;
  --purple: #9C27B0;
  --purple-50: #F3E5F5;
  --teal: #00BCD4;
  --teal-50: #E0F7FA;
  --red: #F44336;
  --red-50: #FFEBEE;

  /* 中性色 */
  --gray-900: #212121;
  --gray-800: #424242;
  --gray-700: #616161;
  --gray-600: #757575;
  --gray-500: #9E9E9E;
  --gray-400: #BDBDBD;
  --gray-300: #E0E0E0;
  --gray-200: #EEEEEE;
  --gray-100: #F5F5F5;
  --gray-50: #FAFAFA;
  --white: #FFFFFF;

  /* 文字颜色 */
  --text-primary: #212121;
  --text-secondary: #616161;
  --text-tertiary: #9E9E9E;
  --text-on-primary: #FFFFFF;

  /* 背景色 */
  --bg-primary: #FFFFFF;
  --bg-secondary: #FAFAFA;
  --bg-tertiary: #F5F5F5;

  /* 边框 */
  --border-light: #E0E0E0;
  --border-medium: #BDBDBD;

  /* 阴影 */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08), 0 1px 2px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07), 0 2px 4px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1), 0 4px 6px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.1), 0 10px 10px rgba(0, 0, 0, 0.04);
  --shadow-primary: 0 4px 12px rgba(21, 101, 192, 0.25);
  --shadow-accent: 0 4px 12px rgba(255, 167, 38, 0.3);

  /* 圆角 */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-full: 9999px;

  /* 间距 */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;
  --space-16: 64px;
  --space-20: 80px;

  /* 过渡 */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;

  /* 容器 */
  --container-max: 1200px;
  --container-padding: 20px;
}

/* ================================
   Reset & Base
   ================================ */

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
  font-size: 15px;
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a {
  color: var(--primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

ul, ol {
  list-style: none;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.3;
  color: var(--text-primary);
}

/* ================================
   通用工具类
   ================================ */

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

.section {
  padding: var(--space-16) 0;
}

.section-title {
  text-align: center;
  margin-bottom: var(--space-12);
}

.section-title .label {
  display: inline-block;
  font-size: 13px;
  color: var(--primary);
  font-weight: 500;
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: var(--space-3);
}

.section-title h2 {
  font-size: 32px;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: var(--space-3);
}

.section-title p {
  font-size: 15px;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  font-size: 15px;
  font-weight: 500;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
  white-space: nowrap;
}

.btn-primary {
  background: var(--primary);
  color: white;
  box-shadow: var(--shadow-primary);
}

.btn-primary:hover {
  background: var(--primary-dark);
  color: white;
  transform: translateY(-1px);
  box-shadow: 0 6px 16px rgba(21, 101, 192, 0.35);
}

.btn-accent {
  background: var(--accent);
  color: white;
  box-shadow: var(--shadow-accent);
}

.btn-accent:hover {
  background: var(--accent-dark);
  color: white;
  transform: translateY(-1px);
  box-shadow: 0 6px 16px rgba(255, 167, 38, 0.4);
}

.btn-outline {
  background: transparent;
  color: var(--primary);
  border: 1.5px solid var(--primary);
}

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

.btn-white {
  background: white;
  color: var(--primary);
}

.btn-white:hover {
  background: var(--primary-50);
  color: var(--primary-dark);
}

.btn-lg {
  padding: 14px 32px;
  font-size: 16px;
}

.btn-sm {
  padding: 8px 20px;
  font-size: 14px;
}

/* ================================
   卡片
   ================================ */

.card {
  background: white;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: all var(--transition-normal);
  border: 1px solid var(--gray-200);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-100);
}

/* ================================
   滚动动画
   ================================ */

.fade-in-up {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in-up.visible {
  opacity: 1;
  transform: translateY(0);
}

.fade-in {
  opacity: 0;
  transition: opacity 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
}

/* ================================
   导航栏
   ================================ */

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid transparent;
  transition: all var(--transition-normal);
}

.navbar.scrolled {
  border-bottom-color: var(--gray-200);
  box-shadow: var(--shadow-sm);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

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

.navbar-logo img {
  height: 40px;
  width: auto;
}

.navbar-logo span {
  font-size: 18px;
  font-weight: 700;
  color: var(--primary-dark);
  letter-spacing: 1px;
}

.navbar-menu {
  display: flex;
  align-items: center;
  gap: 8px;
}

.navbar-menu a {
  display: block;
  padding: 8px 16px;
  color: var(--text-secondary);
  font-size: 15px;
  font-weight: 500;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.navbar-menu a:hover,
.navbar-menu a.active {
  color: var(--primary);
  background: var(--primary-50);
}

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

.navbar-mobile-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  padding: 8px;
  cursor: pointer;
  background: none;
  border: none;
}

.navbar-mobile-toggle span {
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  transition: all var(--transition-fast);
}

/* ================================
   页脚
   ================================ */

.footer {
  background: #0D1B2A;
  color: #94A3B8;
  padding-top: var(--space-16);
}

.footer-top {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.5fr;
  gap: var(--space-10);
  padding-bottom: var(--space-12);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: var(--space-4);
}

.footer-logo img {
  height: 50px;
  width: auto;
  opacity: 0.95;
}

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

.footer-about p {
  font-size: 14px;
  line-height: 1.8;
  margin-bottom: var(--space-4);
}

.footer-about .slogan {
  color: var(--accent-light);
  font-size: 13px;
}

.footer-col h4 {
  color: white;
  font-size: 15px;
  font-weight: 600;
  margin-bottom: var(--space-5);
}

.footer-col ul li {
  margin-bottom: var(--space-3);
}

.footer-col ul li a {
  color: #94A3B8;
  font-size: 14px;
  transition: color var(--transition-fast);
}

.footer-col ul li a:hover {
  color: var(--accent-light);
}

.footer-contact .contact-item {
  display: flex;
  gap: 10px;
  margin-bottom: var(--space-4);
  font-size: 14px;
  line-height: 1.6;
}

.footer-contact .contact-icon {
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-light);
  font-size: 16px;
}

.footer-bottom {
  padding: var(--space-5) 0;
  text-align: center;
  font-size: 13px;
  color: #64748B;
}

.footer-bottom .beian {
  margin-top: var(--space-2);
}

.footer-bottom .beian a {
  color: #64748B;
  margin: 0 var(--space-2);
}

/* ================================
   页面头部 Banner（内页用）
   ================================ */

.page-banner {
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 60%, var(--primary-light) 100%);
  color: white;
  padding: 140px 0 80px;
  position: relative;
  overflow: hidden;
}

.page-banner::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -10%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(255, 167, 38, 0.15) 0%, transparent 70%);
  border-radius: 50%;
}

.page-banner::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -5%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.05) 0%, transparent 70%);
  border-radius: 50%;
}

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

.page-banner h1 {
  font-size: 40px;
  font-weight: 700;
  color: white;
  margin-bottom: var(--space-4);
}

.page-banner p {
  font-size: 17px;
  color: rgba(255, 255, 255, 0.85);
  max-width: 600px;
  line-height: 1.8;
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.7);
  margin-bottom: var(--space-5);
}

.breadcrumb a {
  color: rgba(255, 255, 255, 0.7);
}

.breadcrumb a:hover {
  color: white;
}

.breadcrumb .separator {
  opacity: 0.5;
}

.breadcrumb .current {
  color: white;
}

/* ================================
   响应式
   ================================ */

@media (max-width: 1024px) {
  .footer-top {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .section {
    padding: var(--space-12) 0;
  }

  .section-title h2 {
    font-size: 26px;
  }

  .navbar-menu {
    display: none;
  }

  .navbar-mobile-toggle {
    display: flex;
  }

  .page-banner {
    padding: 120px 0 60px;
  }

  .page-banner h1 {
    font-size: 28px;
  }

  .page-banner p {
    font-size: 15px;
  }

  .footer-top {
    grid-template-columns: 1fr;
    gap: var(--space-8);
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }

  .section-title h2 {
    font-size: 22px;
  }
}