/* ===================================
   中铁西安中心 - 全局样式
   设计风格：现代商务 + 深蓝金色主题
   =================================== */

/* CSS Custom Properties */
:root {
  --color-primary: #1a2744;
  --color-primary-light: #243356;
  --color-primary-dark: #0f1a2e;
  --color-accent: #c9a96e;
  --color-accent-light: #d4b87a;
  --color-accent-dark: #b8944d;
  --color-accent-bg: #faf6ed;
  --color-text: #1e293b;
  --color-text-secondary: #475569;
  --color-text-muted: #94a3b8;
  --color-bg: #ffffff;
  --color-bg-alt: #f6f7f9;
  --color-bg-card: #ffffff;
  --color-border: #e8ecf1;
  --color-border-light: #f1f3f6;
  --shadow-sm: 0 1px 2px rgba(15, 26, 46, 0.04);
  --shadow-md: 0 4px 16px rgba(15, 26, 46, 0.06);
  --shadow-lg: 0 8px 32px rgba(15, 26, 46, 0.08);
  --shadow-xl: 0 16px 48px rgba(15, 26, 46, 0.12);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --max-width: 1180px;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial,
    sans-serif;
  line-height: 1.75;
  color: var(--color-text);
  background: var(--color-bg);
}

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

a:hover {
  color: var(--color-accent);
}

ul,
ol {
  list-style: none;
}

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

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

/* Sections */
.section {
  padding: 80px 0;
  animation: fadeInUp 0.6s ease-out;
}

.bg-light {
  background: var(--color-bg-alt);
}

.section-title {
  font-size: 1.875rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 48px;
  text-align: center;
  letter-spacing: -0.02em;
}

.section-title::after {
  content: "";
  display: block;
  width: 48px;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent), var(--color-accent-dark));
  margin: 14px auto 0;
  border-radius: 2px;
}

/* ===================================
   Header
   =================================== */
.header {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-border-light);
  position: sticky;
  top: 0;
  z-index: 1000;
  transition: box-shadow var(--transition);
}

.header-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 0;
}

.logo a {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--color-primary);
  letter-spacing: -0.02em;
}

.logo a:hover {
  color: var(--color-accent);
}

.header-contact {
  display: flex;
  align-items: center;
}

.phone-link {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-accent-dark);
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}

.phone-link:hover {
  color: var(--color-accent);
  background: var(--color-accent-bg);
}

.phone-icon {
  font-size: 1.2rem;
}

/* Nav */
.nav {
  border-top: 1px solid var(--color-border-light);
}

.nav-list {
  display: flex;
  justify-content: center;
  gap: 4px;
  padding: 0;
}

.nav-item a {
  display: block;
  padding: 14px 22px;
  font-size: 0.938rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}

.nav-item a:hover,
.nav-item.active a {
  color: var(--color-accent-dark);
  background: var(--color-accent-bg);
}

/* Mobile menu button */
.mobile-menu-btn {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  border-radius: var(--radius-sm);
}

.mobile-menu-btn:hover {
  background: var(--color-bg-alt);
}

.mobile-menu-btn span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: all var(--transition);
}

/* ===================================
   Banner (首页)
   =================================== */
.banner {
  position: relative;
  min-height: 600px;
  background: linear-gradient(160deg, #0f1a2e 0%, #1a2744 30%, #243356 60%, #1a2744 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  overflow: hidden;
}

.banner::before {
  content: "";
  position: absolute;
  top: -50%;
  right: -20%;
  width: 60%;
  height: 200%;
  background: radial-gradient(ellipse, rgba(201, 169, 110, 0.08) 0%, transparent 70%);
  pointer-events: none;
}

.banner::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(201, 169, 110, 0.4), transparent);
}

.banner-overlay {
  display: none;
}

.banner-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 760px;
  padding: 48px 24px;
}

.banner-title {
  font-size: 3.5rem;
  font-weight: 800;
  margin-bottom: 20px;
  letter-spacing: -0.03em;
  background: linear-gradient(180deg, #ffffff 0%, #c9a96e 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.banner-subtitle {
  font-size: 1.25rem;
  margin-bottom: 40px;
  opacity: 0.85;
  font-weight: 400;
  color: #d4b87a;
}

.banner-cta {
  display: inline-block;
  padding: 16px 44px;
  background: linear-gradient(135deg, var(--color-accent), var(--color-accent-dark));
  color: #fff;
  font-size: 1.1rem;
  font-weight: 600;
  border-radius: 50px;
  transition: all var(--transition);
  box-shadow: 0 4px 20px rgba(201, 169, 110, 0.35);
  letter-spacing: 0.02em;
}

.banner-cta:hover {
  color: #fff;
  transform: translateY(-3px);
  box-shadow: 0 8px 30px rgba(201, 169, 110, 0.5);
}

/* ===================================
   Page Banner (子页面)
   =================================== */
.page-banner {
  position: relative;
  background: linear-gradient(160deg, #0f1a2e 0%, #1a2744 50%, #243356 100%);
  padding: 80px 0;
  text-align: center;
  color: #fff;
  overflow: hidden;
}

.page-banner::before {
  content: "";
  position: absolute;
  top: -30%;
  right: -15%;
  width: 50%;
  height: 160%;
  background: radial-gradient(ellipse, rgba(201, 169, 110, 0.06) 0%, transparent 70%);
  pointer-events: none;
}

.page-banner .banner-overlay {
  display: none;
}

.page-banner .banner-content {
  position: relative;
  z-index: 1;
  padding: 24px;
}

.page-banner .banner-title {
  font-size: 2.75rem;
  font-weight: 800;
  margin-bottom: 12px;
  letter-spacing: -0.02em;
  background: linear-gradient(180deg, #ffffff 0%, #c9a96e 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.page-banner .banner-subtitle {
  font-size: 1.1rem;
  opacity: 0.8;
  margin-bottom: 0;
  color: #d4b87a;
}

/* ===================================
   Highlights
   =================================== */
.highlights-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.highlight-item {
  text-align: center;
  padding: 36px 20px;
  background: var(--color-bg-card);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.highlight-item::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent), var(--color-accent-dark));
  opacity: 0;
  transition: opacity var(--transition);
}

.highlight-item:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-xl);
  border-color: transparent;
}

.highlight-item:hover::before {
  opacity: 1;
}

.highlight-title {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--color-primary);
  margin-bottom: 8px;
  letter-spacing: -0.02em;
}

.highlight-desc {
  font-size: 0.938rem;
  color: var(--color-text-secondary);
  font-weight: 500;
}

/* ===================================
   Intro
   =================================== */
.intro-content {
  font-size: 1.05rem;
  line-height: 1.9;
  color: var(--color-text-secondary);
  text-align: center;
  max-width: 800px;
  margin: 0 auto 40px;
}

.intro-features {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  max-width: 720px;
  margin: 0 auto;
}

.feature-item {
  font-size: 0.938rem;
  color: var(--color-text);
  padding: 16px 24px;
  background: var(--color-bg-alt);
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  transition: all var(--transition);
  display: flex;
  align-items: center;
  gap: 8px;
}

.feature-item::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  background: var(--color-accent);
  border-radius: 50%;
  flex-shrink: 0;
}

.feature-item:hover {
  border-color: var(--color-accent);
  background: var(--color-accent-bg);
  transform: translateX(4px);
}

/* ===================================
   Info Grid (首页核心参数)
   =================================== */
.info-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
}

.info-item {
  padding: 24px 16px;
  background: var(--color-bg-card);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  text-align: center;
  transition: all var(--transition);
}

.info-item:hover {
  box-shadow: var(--shadow-lg);
  border-color: transparent;
  transform: translateY(-3px);
}

.info-label {
  display: block;
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-bottom: 8px;
  font-weight: 500;
  letter-spacing: 0.04em;
}

.info-value {
  display: block;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-primary);
}

/* ===================================
   Info List (详情页/联系页)
   =================================== */
.info-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  max-width: 800px;
  margin: 0 auto;
}

.info-row {
  display: flex;
  padding: 18px 24px;
  background: var(--color-bg-card);
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  align-items: center;
  transition: all var(--transition);
}

.info-row:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-sm);
}

.info-row .info-label {
  flex: 0 0 140px;
  font-weight: 600;
  color: var(--color-text-secondary);
  font-size: 0.938rem;
  letter-spacing: 0;
  margin-bottom: 0;
}

.info-row .info-value {
  flex: 1;
  color: var(--color-text);
  font-size: 0.938rem;
}

/* ===================================
   Rental
   =================================== */
.rental-update {
  text-align: center;
  color: var(--color-text-muted);
  margin-bottom: 28px;
  font-size: 0.875rem;
}

.rental .info-list {
  margin-bottom: 32px;
}

/* ===================================
   Subsection Title (detail页)
   =================================== */
.subsection-title {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--color-text);
  text-align: center;
  margin: 48px 0 28px;
}

.subsection-title::after {
  content: "";
  display: block;
  width: 36px;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent), var(--color-accent-dark));
  margin: 10px auto 0;
  border-radius: 2px;
}

/* CTA Button */
.cta-button {
  display: block;
  margin: 0 auto;
  max-width: 360px;
  padding: 16px 40px;
  background: linear-gradient(135deg, var(--color-accent), var(--color-accent-dark));
  color: #fff;
  font-size: 1.1rem;
  font-weight: 600;
  border-radius: 50px;
  text-align: center;
  transition: all var(--transition);
  box-shadow: 0 4px 20px rgba(201, 169, 110, 0.3);
}

.cta-button:hover {
  color: #fff;
  transform: translateY(-3px);
  box-shadow: 0 8px 30px rgba(201, 169, 110, 0.45);
}

/* ===================================
   Gallery
   =================================== */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.gallery-item {
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--color-border);
  transition: all var(--transition);
  aspect-ratio: 4/3;
  position: relative;
}

.gallery-item::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 60%, rgba(15, 26, 46, 0.3));
  opacity: 0;
  transition: opacity var(--transition);
}

.gallery-item:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-xl);
  border-color: transparent;
}

.gallery-item:hover::after {
  opacity: 1;
}

.gallery-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.gallery-item:hover img {
  transform: scale(1.08);
}

/* ===================================
   Surrounding Grid (周边配套卡片)
   =================================== */
.surrounding-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.surrounding-item {
  padding: 32px 24px;
  background: var(--color-bg-card);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  text-align: center;
  transition: all var(--transition);
}

.surrounding-item:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-xl);
  border-color: transparent;
}

.surrounding-item h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 12px;
}

.surrounding-item p {
  font-size: 0.938rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* ===================================
   Floorplan Grid (户型展示页)
   =================================== */
.floorplan-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.floorplan-item {
  background: var(--color-bg-card);
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--color-border);
  transition: all var(--transition);
}

.floorplan-item:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-xl);
  border-color: transparent;
}

.floorplan-item img {
  width: 100%;
  height: 240px;
  object-fit: cover;
  transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.floorplan-item:hover img {
  transform: scale(1.06);
}

.floorplan-item h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-primary);
  padding: 20px 24px 4px;
}

.floorplan-item p {
  font-size: 0.938rem;
  color: var(--color-text-secondary);
  padding: 4px 24px 20px;
}

/* ===================================
   News List
   =================================== */
.news-list {
  display: grid;
  gap: 20px;
  max-width: 800px;
  margin: 0 auto;
}

.news-item {
  background: var(--color-bg-card);
  border-radius: var(--radius-md);
  padding: 32px;
  border: 1px solid var(--color-border);
  transition: all var(--transition);
  position: relative;
}

.news-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
  border-color: transparent;
}

.news-date {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-bottom: 10px;
  font-weight: 500;
}

.news-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 12px;
  line-height: 1.5;
}

.news-excerpt {
  font-size: 0.938rem;
  color: var(--color-text-secondary);
  margin-bottom: 16px;
  line-height: 1.75;
}

.news-link {
  display: inline-block;
  font-size: 0.938rem;
  font-weight: 600;
  color: var(--color-accent-dark);
  transition: all var(--transition);
}

.news-link:hover {
  color: var(--color-accent);
  transform: translateX(4px);
}

/* ===================================
   Footer
   =================================== */
.footer {
  background: var(--color-primary-dark);
  color: #94a3b8;
  padding: 60px 0 28px;
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 48px;
  margin-bottom: 40px;
}

.footer-info h3,
.footer-links h3,
.friends-links h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 18px;
}

.footer-info p {
  font-size: 0.938rem;
  margin-bottom: 10px;
  line-height: 1.7;
}

.footer-info a {
  color: var(--color-accent-light);
}

.footer-info a:hover {
  color: var(--color-accent);
}

.footer-links ul {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px;
}

.footer-links ul li a {
  font-size: 0.938rem;
  color: #94a3b8;
  transition: color var(--transition);
}

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

.friends-links {
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  margin-bottom: 24px;
}

.links-list {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.links-list a {
  font-size: 0.875rem;
  color: #94a3b8;
  transition: color var(--transition);
}

.links-list a:hover {
  color: var(--color-accent-light);
}

.footer-bottom {
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  text-align: center;
  font-size: 0.875rem;
  color: #64748b;
}

/* ===================================
   Responsive Design
   =================================== */
@media (max-width: 1024px) {
  .highlights-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

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

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

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

@media (max-width: 768px) {
  .section {
    padding: 56px 0;
  }

  .section-title {
    font-size: 1.6rem;
    margin-bottom: 36px;
  }

  .banner {
    min-height: 420px;
  }

  .banner-title {
    font-size: 2.25rem;
  }

  .banner-subtitle {
    font-size: 1rem;
  }

  .page-banner .banner-title {
    font-size: 2rem;
  }

  .mobile-menu-btn {
    display: flex;
  }

  .nav {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
  }

  .nav.active {
    max-height: 500px;
  }

  .nav-list {
    flex-direction: column;
    padding: 12px 0;
  }

  .nav-item a {
    padding: 12px 24px;
  }

  .highlights-grid,
  .info-grid,
  .info-list,
  .intro-features,
  .floorplan-grid,
  .surrounding-grid {
    grid-template-columns: 1fr;
  }

  .gallery-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }

  .footer-content {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .cta-button {
    max-width: 100%;
  }
}

@media (max-width: 480px) {
  .banner-title {
    font-size: 1.75rem;
  }

  .banner-cta {
    padding: 14px 32px;
    font-size: 1rem;
  }

  .page-banner .banner-title {
    font-size: 1.6rem;
  }

  .highlight-title {
    font-size: 2rem;
  }

  .gallery-grid {
    grid-template-columns: 1fr;
  }
}

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