/* === 伊城 · 土耳其真实色彩 === */

:root {
  /* 博斯普鲁斯天空 — 从深蓝到晴朗 */
  --sky-night: #0d1b2a;
  --sky-deep: #1a3a5c;
  --sky-mid: #2c5f7c;
  --sky-blue: #4a8db8;
  
  /* 伊兹尼克蓝（蓝色清真寺瓷砖） */
  --iznik-blue: #1e5f8a;
  --iznik-teal: #2d7d9f;
  
  /* 卡帕多奇亚日落 — 热气球日出的真实色彩 */
  --sun-gold: #f0c27a;
  --sun-warm: #e8a090;
  --balloon-orange: #d4752c;
  --balloon-red: #c0392b;
  
  /* 岩石地貌 */
  --stone-light: #faf0e0;
  --stone-beige: #e8dcc8;
  --stone-warm: #d4c4a8;
  --stone-tan: #c4b498;
  
  /* 康乃馨红 */
  --carnation: #8b1a1a;
  
  /* 赤陶土 */
  --terracotta: #a0522d;
  
  /* 伊斯坦布尔街景黄（出租车） */
  --taxi-yellow: #e8c060;
  
  /* 文字 */
  --ink-dark: #2a1f14;
  --ink-muted: #6b5b48;
  
  /* 阴影 */
  --shadow-soft: rgba(13, 27, 42, 0.3);
  --shadow-warm: rgba(160, 82, 45, 0.2);
  
  /* 字体 */
  --serif: "Noto Serif SC", "Songti SC", "STSong", "SimSun", serif;
  --sans: "PingFang SC", "Helvetica Neue", "Microsoft YaHei", sans-serif;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  background: linear-gradient(180deg, 
    var(--sky-night) 0%, 
    var(--sky-deep) 30%,
    var(--sky-mid) 60%, 
    var(--sky-deep) 100%);
  color: var(--ink-dark);
  font-family: var(--sans);
  line-height: 1.9;
  letter-spacing: 0.02em;
  min-height: 100vh;
}

.container {
  max-width: 860px;
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 80px 0;
  position: relative;
}

.section-title {
  font-family: var(--serif);
  font-size: 36px;
  font-weight: 400;
  text-align: center;
  margin-bottom: 48px;
  letter-spacing: 0.1em;
  color: var(--sun-gold);
  text-shadow: 2px 2px 12px var(--shadow-soft);
}

.section-subtitle {
  text-align: center;
  color: var(--stone-warm);
  font-size: 14px;
  margin-top: -32px;
  margin-bottom: 48px;
  letter-spacing: 0.06em;
  font-style: italic;
}

/* === 阅读《伊城》 文章入口 === */
.read-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 28px;
  max-width: 900px;
  margin: 0 auto;
}
.read-card {
  display: block;
  text-decoration: none;
  background: var(--stone-light);
  border: 1px solid rgba(160, 82, 45, 0.15);
  border-radius: 16px;
  padding: 32px 30px;
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
}
.read-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px var(--shadow-warm);
  border-color: var(--terracotta);
}
.read-kicker {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--carnation);
  border: 1px solid rgba(139, 26, 26, 0.3);
  border-radius: 999px;
  padding: 3px 12px;
  margin-bottom: 16px;
}
.read-title {
  font-family: var(--serif);
  font-size: 26px;
  font-weight: 600;
  color: var(--ink-dark);
  margin-bottom: 12px;
}
.read-desc {
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-muted);
  margin-bottom: 20px;
}
.read-more {
  font-size: 14px;
  color: var(--terracotta);
  letter-spacing: 0.04em;
}

/* 文章卡片颜色 */
.read-card.history { border-left: 4px solid var(--terracotta); }
.read-card.culture { border-left: 4px solid var(--iznik-blue); }
.read-card.economy { border-left: 4px solid var(--sun-gold); }
.read-card.politics { border-left: 4px solid var(--carnation); }
.read-card.geography { border-left: 4px solid var(--sky-blue); }

.read-card.history .read-kicker { color: var(--terracotta); border-color: rgba(160, 82, 45, 0.3); }
.read-card.culture .read-kicker { color: var(--iznik-blue); border-color: rgba(30, 95, 138, 0.3); }
.read-card.economy .read-kicker { color: var(--balloon-orange); border-color: rgba(212, 117, 44, 0.3); }
.read-card.politics .read-kicker { color: var(--carnation); border-color: rgba(139, 26, 26, 0.3); }
.read-card.geography .read-kicker { color: var(--sky-blue); border-color: rgba(74, 141, 184, 0.3); }

/* === 付费合集 === */
.collection {
  background: linear-gradient(180deg, 
    rgba(13, 27, 42, 0.3) 0%, 
    rgba(44, 95, 124, 0.15) 100%);
}

.collection-card {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 48px;
  align-items: center;
  background: linear-gradient(135deg, 
    var(--stone-light) 0%, 
    var(--stone-beige) 50%,
    var(--stone-warm) 100%);
  border: 1px solid rgba(201, 168, 76, 0.5);
  border-radius: 16px;
  padding: 48px;
  box-shadow: 
    0 8px 32px var(--shadow-soft),
    inset 0 0 60px rgba(201, 168, 76, 0.08);
  position: relative;
  overflow: hidden;
}

.collection-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='3'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.06'/%3E%3C/svg%3E");
  border-radius: 16px;
  pointer-events: none;
}

.collection-content {
  position: relative;
  z-index: 1;
}

.collection-badge {
  display: inline-block;
  background: linear-gradient(135deg, var(--balloon-orange) 0%, var(--terracotta) 100%);
  color: white;
  font-size: 12px;
  letter-spacing: 0.1em;
  padding: 6px 16px;
  border-radius: 4px;
  margin-bottom: 20px;
}

.collection-title {
  font-family: var(--serif);
  font-size: 32px;
  font-weight: 400;
  color: var(--ink-dark);
  margin-bottom: 16px;
}

.collection-desc {
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-muted);
  margin-bottom: 24px;
}

.collection-price {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 28px;
}

.price-old {
  font-size: 18px;
  color: var(--ink-muted);
  text-decoration: line-through;
}

.price-new {
  font-size: 36px;
  font-weight: 600;
  color: var(--balloon-orange);
  font-family: var(--serif);
}

.collection-btn {
  width: auto;
  padding: 16px 48px;
}

.collection-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

.book-icon {
  width: 180px;
  height: 240px;
  filter: drop-shadow(0 8px 24px rgba(160, 82, 45, 0.3));
}

@media (max-width: 768px) {
  .collection-card {
    grid-template-columns: 1fr;
    padding: 32px 24px;
    text-align: center;
  }

  .collection-visual {
    order: -1;
    margin-bottom: 24px;
  }

  .collection-price {
    justify-content: center;
  }

  .collection-btn {
    width: 100%;
  }
}

/* === 首屏 - 卡帕多奇亚日出渐变 === */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  position: relative;
  background: 
    radial-gradient(ellipse at 20% 85%, rgba(240, 194, 122, 0.3) 0%, transparent 45%),
    radial-gradient(ellipse at 80% 15%, rgba(192, 57, 43, 0.08) 0%, transparent 35%),
    linear-gradient(180deg, 
      var(--sky-night) 0%, 
      var(--sky-deep) 20%,
      var(--sky-mid) 50%,
      var(--sky-blue) 75%,
      var(--sun-warm) 90%,
      var(--sun-gold) 100%);
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url("data:image/svg+xml,%3Csvg width='200' height='200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence baseFrequency='0.65' numOctaves='4'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.03'/%3E%3C/svg%3E");
  pointer-events: none;
}

.hero-inner {
  padding: 60px 40px;
  position: relative;
  z-index: 1;
}

.hero-cover {
  margin: 0 auto 40px;
  max-width: 460px;
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 18px 48px rgba(13, 27, 42, 0.45);
  background: var(--stone-light);
}

.hero-cover-img {
  display: block;
  width: 100%;
  height: auto;
}

.brand-logo {
  margin-bottom: 28px;
  display: flex;
  justify-content: center;
}

.brand-logo-img {
  width: 96px;
  height: 96px;
  border-radius: 22px;
  box-shadow: 0 8px 28px rgba(13, 27, 42, 0.35);
  background: var(--stone-light);
}

.tagline {
  font-size: 14px;
  letter-spacing: 0.2em;
  color: var(--sun-gold);
  margin-bottom: 28px;
  text-transform: uppercase;
  text-shadow: 0 1px 8px rgba(240, 194, 122, 0.4);
}

.title {
  font-family: var(--serif);
  font-size: 80px;
  font-weight: 400;
  letter-spacing: 0.18em;
  margin-bottom: 20px;
  color: var(--sun-gold);
  text-shadow: 
    3px 3px 0 var(--sky-deep),
    0 0 50px rgba(240, 194, 122, 0.6),
    0 0 100px rgba(240, 194, 122, 0.3);
}

.subtitle {
  font-size: 18px;
  color: var(--stone-beige);
  letter-spacing: 0.08em;
  margin-bottom: 48px;
  font-family: var(--serif);
}

/* 滚动提示 */
.scroll-hint {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--stone-warm);
  font-size: 12px;
  letter-spacing: 0.1em;
  animation: bounce 2s ease-in-out infinite;
}

.scroll-hint svg {
  opacity: 0.6;
}

@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(8px); }
}

/* === 按钮 - 热气球橙色 === */
.btn {
  display: inline-block;
  padding: 18px 48px;
  border-radius: 4px;
  font-size: 16px;
  letter-spacing: 0.12em;
  text-decoration: none;
  transition: all 0.3s ease;
  cursor: pointer;
  border: none;
  font-family: var(--sans);
  background: linear-gradient(135deg, 
    var(--balloon-orange) 0%, 
    var(--terracotta) 100%);
  color: var(--stone-light);
  box-shadow: 
    0 4px 20px var(--shadow-warm),
    inset 0 1px 0 rgba(255,255,255,0.25),
    0 0 0 2px rgba(212, 117, 44, 0.3);
  font-weight: 500;
}

.btn:hover {
  background: linear-gradient(135deg, 
    #e8853a 0%, 
    #b8622a 100%);
  transform: translateY(-2px);
  box-shadow: 
    0 6px 28px var(--shadow-warm),
    inset 0 1px 0 rgba(255,255,255,0.35),
    0 0 0 3px rgba(212, 117, 44, 0.5);
}

.btn:active {
  transform: translateY(1px);
}

.btn-primary {
  background: linear-gradient(135deg, 
    var(--balloon-orange) 0%, 
    var(--terracotta) 100%);
}

.btn-dark {
  background: linear-gradient(135deg, 
    var(--iznik-blue) 0%, 
    var(--sky-mid) 100%);
  color: var(--stone-beige);
}

.btn-dark:hover {
  background: linear-gradient(135deg, 
    #2670a0 0%, 
    var(--iznik-blue) 100%);
}

/* === 内容面板 - 岩石米黄 === */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}

.about-text {
  background: linear-gradient(135deg, 
    var(--stone-light) 0%, 
    var(--stone-beige) 50%,
    var(--stone-warm) 100%);
  padding: 36px;
  border-radius: 8px;
  border: 1px solid rgba(201, 168, 76, 0.5);
  box-shadow: 
    0 8px 32px var(--shadow-soft),
    inset 0 0 60px rgba(201, 168, 76, 0.08);
  position: relative;
}

.about-text::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='3'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.06'/%3E%3C/svg%3E");
  border-radius: 8px;
  pointer-events: none;
}

.about-text p {
  margin-bottom: 16px;
  font-size: 16px;
  text-align: justify;
  position: relative;
  z-index: 1;
  color: var(--ink-dark);
}

.about-text .final {
  font-family: var(--serif);
  font-size: 18px;
  color: var(--balloon-orange);
  margin-top: 28px;
  letter-spacing: 0.06em;
  font-style: italic;
  position: relative;
  z-index: 1;
}

/* === 书籍动画 - 石头雕刻感 === */
.book {
  width: 220px;
  height: 280px;
  position: relative;
  margin: 0 auto;
  background: linear-gradient(135deg, 
    var(--stone-light) 0%, 
    var(--stone-beige) 100%);
  border-radius: 4px 12px 12px 4px;
  border: 2px solid var(--taxi-yellow);
  box-shadow: 
    6px 6px 28px var(--shadow-soft),
    inset -2px 0 12px rgba(201, 168, 76, 0.15),
    inset 0 0 40px rgba(240, 194, 122, 0.1);
}

.book::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 20px;
  background: linear-gradient(90deg, 
    rgba(30, 95, 138, 0.1) 0%, 
    transparent 100%);
  border-radius: 4px 0 0 4px;
}

.spine {
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 3px;
  background: linear-gradient(180deg, 
    var(--iznik-blue) 0%, 
    var(--sky-deep) 100%);
  transform: translateX(-50%);
  z-index: 2;
  box-shadow: 1px 0 4px rgba(0,0,0,0.2);
}

.page {
  position: absolute;
  right: 10px;
  top: 14px;
  bottom: 14px;
  width: 92px;
  background: linear-gradient(135deg, 
    #ffffff 0%, 
    var(--stone-beige) 100%);
  border: 1px solid var(--stone-tan);
  padding: 20px 16px;
  font-size: 11px;
  color: var(--ink-muted);
  transform-origin: left center;
  animation: pageTurn 4s ease-in-out infinite;
  box-shadow: 2px 2px 12px var(--shadow-soft);
}

.page-front {
  z-index: 3;
}

.page-text {
  font-family: var(--serif);
  font-size: 12px;
  line-height: 1.6;
  color: var(--ink-dark);
  margin-bottom: 14px;
}

.page-line {
  height: 2px;
  background: linear-gradient(90deg, 
    var(--stone-tan) 0%, 
    transparent 100%);
  margin-bottom: 10px;
}

@keyframes pageTurn {
  0%, 100% { transform: rotateY(0deg); }
  50% { transform: rotateY(-18deg); }
}

/* === 实用信息 === */
.practical {
  background: linear-gradient(180deg, 
    rgba(13, 27, 42, 0.2) 0%, 
    rgba(44, 95, 124, 0.1) 100%);
}

.practical-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 32px;
}

.practical-card {
  perspective: 1000px;
  cursor: pointer;
  min-height: 240px;
}

.card-front,
.card-back {
  background: linear-gradient(135deg, 
    var(--stone-light) 0%, 
    var(--stone-beige) 100%);
  border: 1px solid rgba(201, 168, 76, 0.4);
  border-radius: 12px;
  padding: 28px 24px;
  text-align: center;
  box-shadow: 
    0 4px 16px var(--shadow-soft),
    inset 0 1px 0 rgba(255,255,255,0.5);
  backface-visibility: hidden;
  transition: transform 0.6s ease;
}

.card-front {
  position: relative;
}

.card-back {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  transform: rotateY(180deg);
  display: flex;
  flex-direction: column;
  text-align: left;
  padding: 20px;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--terracotta) transparent;
}

.card-back::-webkit-scrollbar {
  width: 4px;
}

.card-back::-webkit-scrollbar-track {
  background: transparent;
}

.card-back::-webkit-scrollbar-thumb {
  background: var(--terracotta);
  border-radius: 2px;
}

.practical-card.flipped .card-front {
  transform: rotateY(-180deg);
}

.practical-card.flipped .card-back {
  transform: rotateY(0deg);
}

.practical-card:hover {
  transform: translateY(-4px);
  box-shadow: 
    0 8px 24px var(--shadow-soft),
    0 0 0 2px rgba(201, 168, 76, 0.3);
}

.practical-icon {
  width: 48px;
  height: 48px;
  margin: 0 auto 16px;
  color: var(--iznik-blue);
}

.practical-icon svg {
  width: 100%;
  height: 100%;
}

.practical-card h3 {
  font-family: var(--serif);
  font-size: 18px;
  font-weight: 500;
  color: var(--ink-dark);
  margin-bottom: 12px;
}

.practical-card p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-muted);
}

.card-summary {
  font-size: 13px;
  color: var(--terracotta);
  margin-bottom: 12px;
}

.card-expand {
  font-size: 11px;
  color: var(--ink-muted);
  opacity: 0.7;
  display: block;
  margin-top: auto;
}

.card-back h3 {
  font-size: 16px;
  color: var(--iznik-blue);
  margin-bottom: 12px;
  text-align: center;
}

.card-back p {
  font-size: 13px;
  margin-bottom: 8px;
  color: var(--ink-dark);
}

.card-back strong {
  color: var(--terracotta);
}

.practical-tip {
  background: linear-gradient(135deg, 
    var(--stone-light) 0%, 
    var(--stone-beige) 100%);
  border: 1px solid rgba(201, 168, 76, 0.4);
  border-radius: 12px;
  padding: 20px 28px;
  text-align: center;
  box-shadow: 0 4px 16px var(--shadow-soft);
}

.practical-tip p {
  font-size: 15px;
  color: var(--ink-dark);
  line-height: 1.8;
}

.practical-tip strong {
  color: var(--balloon-orange);
}

@media (max-width: 768px) {
  .practical-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }

  .practical-card {
    min-height: 180px;
  }

  .card-front,
  .card-back {
    padding: 20px 16px;
  }

  .practical-icon {
    width: 40px;
    height: 40px;
  }
}

@media (max-width: 480px) {
  .practical-grid {
    grid-template-columns: 1fr;
  }
}




/* === 机场大巴卡片 === */
.airport-bus-card {
  perspective: 1000px;
  cursor: pointer;
  max-width: 900px;
  margin: 0 auto 40px;
  height: 120px;
  border-radius: 16px;
}

.airport-bus-front,
.airport-bus-back {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
  transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
  border-radius: 16px;
  overflow: hidden;
}

.airport-bus-front {
  background: linear-gradient(135deg, #1a3a5c 0%, #2c5f7c 100%);
  border: 2px solid rgba(240, 194, 122, 0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  padding: 24px 32px;
  box-shadow: 0 8px 32px rgba(13, 27, 42, 0.3);
}

.airport-bus-front:hover {
  border-color: var(--sun-gold);
  box-shadow: 0 12px 40px rgba(13, 27, 42, 0.4);
}

.bus-icon {
  font-size: 40px;
  filter: drop-shadow(0 2px 4px rgba(0,0,0,0.3));
}

.bus-label {
  font-family: var(--serif);
  font-size: 22px;
  font-weight: 600;
  color: #ffffff;
  letter-spacing: 0.05em;
}

.bus-hint {
  font-size: 13px;
  color: var(--sun-gold);
  letter-spacing: 0.05em;
  padding: 4px 12px;
  border: 1px solid rgba(240, 194, 122, 0.5);
  border-radius: 20px;
}

.airport-bus-back {
  transform: rotateY(180deg);
  background: linear-gradient(135deg, #faf5ed 0%, #f0e6d3 100%);
  border: 2px solid rgba(160, 82, 45, 0.3);
  display: flex;
  flex-direction: column;
  padding: 20px 24px;
  box-shadow: 0 8px 32px rgba(13, 27, 42, 0.25);
}

.bus-scroll {
  flex: 1;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--terracotta) #f5f0e6;
}

.bus-scroll::-webkit-scrollbar {
  width: 6px;
}

.bus-scroll::-webkit-scrollbar-track {
  background: #f5f0e6;
  border-radius: 3px;
}

.bus-scroll::-webkit-scrollbar-thumb {
  background: var(--terracotta);
  border-radius: 3px;
}

.bus-sub {
  text-align: center;
  margin-bottom: 16px;
  font-size: 14px;
  color: var(--ink-muted);
}

.bus-sub a {
  color: var(--terracotta);
  text-decoration: none;
}

.bus-sub a:hover {
  text-decoration: underline;
}

.bus-item {
  padding: 12px 0;
  border-bottom: 1px solid rgba(160, 82, 45, 0.12);
}

.bus-item:last-child {
  border-bottom: none;
}

.bus-item strong {
  display: block;
  color: var(--carnation);
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 6px;
}

.bus-item p {
  font-size: 14px;
  color: var(--ink-dark);
  line-height: 1.6;
  margin: 0;
}

.bus-item ul {
  margin: 6px 0 0 0;
  padding: 0 0 0 18px;
  font-size: 14px;
  color: var(--ink-dark);
  line-height: 1.8;
}

.bus-item li {
  margin-bottom: 4px;
}

.bus-warning {
  margin-top: 12px;
  padding: 12px 16px;
  background: rgba(201, 168, 76, 0.15);
  border-radius: 8px;
  font-size: 13px;
  color: var(--ink-dark);
  text-align: center;
}

.airport-bus-card.flipped .airport-bus-front {
  transform: rotateY(-180deg);
}

.airport-bus-card.flipped .airport-bus-back {
  transform: rotateY(0deg);
}

/* 移动端适配 */
@media (max-width: 768px) {
  .airport-bus-card {
    height: 100px;
  }
  
  .bus-label {
    font-size: 18px;
  }
  
  .bus-icon {
    font-size: 32px;
  }
}

.acts-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.act-card {
  text-align: center;
  padding: 40px 24px;
  background: linear-gradient(135deg, 
    var(--stone-light) 0%, 
    var(--stone-beige) 50%,
    var(--stone-warm) 100%);
  border: 1px solid rgba(201, 168, 76, 0.5);
  border-radius: 8px;
  transition: all 0.3s ease;
  box-shadow: 
    0 4px 24px var(--shadow-soft),
    inset 0 1px 0 rgba(255,255,255,0.6);
  position: relative;
}

.act-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='1.0' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.06'/%3E%3C/svg%3E");
  border-radius: 8px;
  pointer-events: none;
}

.act-card:hover {
  transform: translateY(-6px);
  box-shadow: 
    0 8px 36px var(--shadow-soft),
    0 0 0 3px rgba(201, 168, 76, 0.4),
    inset 0 1px 0 rgba(255,255,255,0.7);
  border-color: var(--taxi-yellow);
}

.act-num {
  font-family: var(--serif);
  font-size: 48px;
  color: var(--iznik-blue);
  margin-bottom: 16px;
  text-shadow: 1px 1px 4px var(--shadow-soft);
  position: relative;
  z-index: 1;
}

.act-title {
  font-family: var(--serif);
  font-size: 24px;
  margin-bottom: 18px;
  color: var(--ink-dark);
  position: relative;
  z-index: 1;
}

.act-desc {
  font-size: 14px;
  color: var(--ink-muted);
  line-height: 1.9;
  position: relative;
  z-index: 1;
}

/* === 伊斯坦布尔板块 === */
.istanbul-content {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 48px;
  align-items: start;
}

.city-intro {
  background: linear-gradient(135deg, 
    var(--stone-light) 0%, 
    var(--stone-beige) 50%,
    var(--stone-warm) 100%);
  padding: 32px;
  border-radius: 8px;
  border: 1px solid rgba(201, 168, 76, 0.5);
  box-shadow: 
    0 4px 24px var(--shadow-soft),
    inset 0 0 50px rgba(201, 168, 76, 0.08);
  position: relative;
}

.city-intro::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.05'/%3E%3C/svg%3E");
  border-radius: 8px;
  pointer-events: none;
}

.city-intro blockquote {
  font-family: var(--serif);
  font-style: italic;
  font-size: 16px;
  color: var(--sky-deep);
  border-left: 4px solid var(--balloon-orange);
  padding-left: 20px;
  margin-bottom: 24px;
  line-height: 1.8;
  position: relative;
  z-index: 1;
}

.city-intro p {
  margin-bottom: 12px;
  font-size: 15px;
  line-height: 2;
  position: relative;
  z-index: 1;
}

.map-frame {
  width: 100%;
  height: 480px;
  border: 2px solid var(--taxi-yellow);
  border-radius: 8px;
  box-shadow: 
    0 4px 24px var(--shadow-soft),
    0 0 0 5px rgba(232, 192, 96, 0.25);
}

@media (max-width: 768px) {
  .map-frame {
    height: 380px;
  }
}

/* === 可信度卡片 === */
.cred-section {
  background: linear-gradient(180deg, 
    rgba(13, 27, 42, 0.25) 0%, 
    rgba(44, 95, 124, 0.15) 100%);
}

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

.cred-item {
  display: flex;
  align-items: flex-start;
  gap: 18px;
  padding: 28px;
  background: linear-gradient(135deg, 
    var(--stone-light) 0%, 
    var(--stone-beige) 100%);
  border-radius: 8px;
  border: 1px solid rgba(201, 168, 76, 0.5);
  box-shadow: 
    0 4px 20px var(--shadow-soft),
    inset 0 1px 0 rgba(255,255,255,0.6);
  transition: all 0.3s ease;
  position: relative;
}

.cred-item:hover {
  transform: translateY(-4px);
  box-shadow: 
    0 8px 32px var(--shadow-soft),
    0 0 0 2px rgba(201, 168, 76, 0.4);
}

.cred-badge {
  font-size: 12px;
  letter-spacing: 0.15em;
  padding: 6px 14px;
  border-radius: 4px;
  border: 1px solid currentColor;
  flex-shrink: 0;
  font-family: var(--serif);
  font-weight: bold;
}

.cred-item.fact .cred-badge { 
  color: var(--iznik-blue); 
  background: rgba(30, 95, 138, 0.12);
}
.cred-item.legend .cred-badge { 
  color: var(--balloon-orange); 
  background: rgba(212, 117, 44, 0.12);
}
.cred-item.unknown .cred-badge { 
  color: var(--ink-muted); 
  background: rgba(107, 91, 72, 0.12);
}

.cred-item strong {
  display: block;
  font-size: 16px;
  margin-bottom: 8px;
  color: var(--ink-dark);
}

.cred-item p {
  font-size: 13px;
  color: var(--ink-muted);
  line-height: 1.7;
}

.cred-note {
  text-align: center;
  font-size: 15px;
  color: var(--sun-gold);
  font-style: italic;
  font-family: var(--serif);
}

/* === 留资表单 === */
.signup {
  text-align: center;
  background: linear-gradient(180deg, 
    rgba(13, 27, 42, 0.35) 0%, 
    rgba(44, 95, 124, 0.2) 100%);
}

.signup-form .input-group {
  display: flex;
  gap: 14px;
  max-width: 440px;
  margin: 0 auto 18px;
}

.signup-form input[type="email"] {
  flex: 1;
  padding: 16px 22px;
  border: 1px solid rgba(201, 168, 76, 0.6);
  border-radius: 4px;
  font-size: 15px;
  font-family: var(--sans);
  background: linear-gradient(135deg, 
    #ffffff 0%, 
    var(--stone-light) 100%);
  color: var(--ink-dark);
  box-shadow: 
    inset 0 2px 6px rgba(0,0,0,0.08),
    0 2px 12px var(--shadow-soft);
}

.signup-form input[type="email"]:focus {
  outline: none;
  border-color: var(--taxi-yellow);
  box-shadow: 
    inset 0 2px 6px rgba(0,0,0,0.08),
    0 0 0 3px rgba(232, 192, 96, 0.3);
}

.form-note {
  font-size: 13px;
  color: var(--stone-warm);
  margin-top: 14px;
}

.success-msg {
  margin-top: 28px;
  padding: 24px;
  background: linear-gradient(135deg, 
    var(--stone-light) 0%, 
    var(--stone-warm) 100%);
  border-radius: 8px;
  color: var(--iznik-blue);
  border: 1px solid rgba(201, 168, 76, 0.5);
  box-shadow: 
    0 4px 20px var(--shadow-soft),
    inset 0 0 40px rgba(201, 168, 76, 0.1);
}

/* === 固定导航栏 === */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(13, 27, 42, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(201, 168, 76, 0.2);
  transition: all 0.3s ease;
}

.navbar.scrolled {
  background: rgba(13, 27, 42, 0.95);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--sun-gold);
}

.nav-logo-img {
  width: 36px;
  height: 36px;
  border-radius: 8px;
}

.nav-logo-text {
  font-family: var(--serif);
  font-size: 20px;
  font-weight: 500;
  letter-spacing: 0.1em;
}

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

.nav-link {
  font-size: 14px;
  color: var(--stone-beige);
  text-decoration: none;
  letter-spacing: 0.06em;
  transition: color 0.2s ease;
  position: relative;
}

.nav-link:hover {
  color: var(--sun-gold);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--sun-gold);
  transition: width 0.2s ease;
}

.nav-link:hover::after {
  width: 100%;
}

.nav-cta {
  background: linear-gradient(135deg, var(--balloon-orange) 0%, var(--terracotta) 100%);
  color: var(--stone-light) !important;
  padding: 8px 20px;
  border-radius: 4px;
  font-weight: 500;
}

.nav-cta:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px var(--shadow-warm);
}

.nav-cta::after {
  display: none;
}

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

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--stone-beige);
  transition: all 0.3s ease;
}

/* 移动端导航 */
@media (max-width: 768px) {
  .nav-links {
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    background: rgba(13, 27, 42, 0.98);
    flex-direction: column;
    padding: 24px;
    gap: 20px;
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: all 0.3s ease;
  }

  .nav-links.active {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
  }

  .nav-toggle.active span:nth-child(2) {
    opacity: 0;
  }

  .nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
  }
}

/* === 页脚 === */
.footer {
  padding: 48px 0;
  text-align: center;
  border-top: 1px solid rgba(201, 168, 76, 0.4);
  color: var(--sun-gold);
  font-size: 14px;
  background: linear-gradient(180deg, 
    rgba(13, 27, 42, 0.6) 0%, 
    var(--sky-night) 100%);
}

.footer-note {
  font-size: 13px;
  margin-top: 10px;
  letter-spacing: 0.08em;
  font-family: var(--serif);
  font-style: italic;
  color: var(--stone-warm);
}

/* === 响应式 === */
@media (max-width: 768px) {
  .about-grid,
  .istanbul-content {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .acts-grid,
  .cred-grid {
    grid-template-columns: 1fr;
  }

  .title {
    font-size: 56px;
  }
  .brand-logo-img {
    width: 76px;
    height: 76px;
    border-radius: 18px;
  }
  .hero-cover {
    max-width: 340px;
    margin-bottom: 32px;
  }

  .section {
    padding: 60px 0;
  }

  .signup-form .input-group {
    flex-direction: column;
  }

  .btn {
    width: 100%;
  }

  .scroll-hint {
    bottom: 24px;
  }
}

/* === 淡入动画 === */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* === 首屏加载动画 === */
.hero.loaded .hero-inner {
  animation: fadeInUp 1s ease forwards;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* === 装饰元素 === */

/* 热气球飘浮 - 极简色块 */
.deco-balloons {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  overflow: hidden;
}

.balloon {
  position: absolute;
  animation: float 8s ease-in-out infinite;
}

.b1 {
  top: 8%;
  left: 3%;
  width: 52px;
  height: 78px;
  animation-delay: 0s;
}

.b2 {
  top: 16%;
  right: 5%;
  width: 48px;
  height: 72px;
  animation-delay: 4s;
}

.b3 {
  top: 34%;
  left: 9%;
  width: 44px;
  height: 66px;
  animation-delay: 8s;
}

@keyframes float {
  0%, 100% { transform: translateY(0px) rotate(-2deg); }
  50% { transform: translateY(-20px) rotate(2deg); }
}

/* 极简分隔线 - 一条淡线 */
.divider {
  display: flex;
  justify-content: center;
  padding: 30px 0;
  opacity: 0.4;
}

.divider::before {
  content: '';
  width: 120px;
  height: 1px;
  background: linear-gradient(90deg, transparent, #a0522d, transparent);
}

/* 加拉塔石塔装饰 - 一笔剪影 */
.tower-deco {
  width: 80px;
  height: 160px;
  margin: 0 auto;
  display: block;
}

/* 猫咪装饰 */
.city-cat {
  margin-top: 28px;
  display: flex;
  justify-content: center;
  opacity: 0.7;
}

.city-cat svg {
  width: 100px;
  height: 80px;
}

/* 精灵烟囱底部装饰 - 远山轮廓 */
.istanbul-footer-deco {
  margin-top: 40px;
  display: flex;
  justify-content: center;
  opacity: 0.6;
}

.chimneys {
  width: 400px;
  max-width: 100%;
  height: auto;
}

/* 页脚游船 */
.footer-boat {
  display: flex;
  justify-content: center;
  margin-bottom: 16px;
  opacity: 0.5;
}

.footer-boat svg {
  width: 300px;
  max-width: 90%;
  height: auto;
}

/* === 旅行者锦囊 === */
.tips {
  background: linear-gradient(180deg,
    rgba(13, 27, 42, 0.18) 0%,
    rgba(44, 95, 124, 0.12) 100%);
}

.tips-grid {
  display: flex;
  flex-direction: column;
  gap: 14px;
  max-width: 760px;
  margin: 0 auto;
}

.tip-category {
  border: 2px solid rgba(160, 82, 45, 0.25);
  border-radius: 16px;
  overflow: hidden;
  background: #ffffff;
  box-shadow: 0 4px 20px rgba(13, 27, 42, 0.12);
  transition: box-shadow 0.3s ease, border-color 0.3s ease;
}

.tip-category:hover {
  box-shadow: 0 8px 32px rgba(13, 27, 42, 0.18);
  border-color: rgba(160, 82, 45, 0.4);
}

.tip-header {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 18px 24px;
  background: linear-gradient(135deg, #1a3a5c 0%, #2c5f7c 100%);
  cursor: pointer;
  text-align: left;
  font-family: var(--serif);
  font-size: 18px;
  transition: background 0.3s ease;
  position: relative;
}

.tip-header:hover {
  background: linear-gradient(135deg, #243f5c 0%, #366a8a 100%);
}

.tip-emoji {
  font-size: 26px;
  flex-shrink: 0;
}

.tip-label {
  flex: 1;
  font-weight: 600;
  color: #ffffff;
  letter-spacing: 0.06em;
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
}

.tip-count {
  font-family: var(--sans);
  font-size: 12px;
  color: #f0c060;
  letter-spacing: 0.05em;
  padding: 4px 12px;
  background: rgba(255, 255, 255, 0.15);
  border-radius: 20px;
  font-weight: 500;
}

.tip-arrow {
  font-family: var(--sans);
  font-size: 14px;
  color: #f0c060;
  transition: transform 0.35s ease;
}

.tip-category.active .tip-arrow {
  transform: rotate(180deg);
}

.tip-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.45s ease;
  background: #faf5ed;
}

.tip-category.active .tip-content {
  max-height: 900px;
}

.tip-scroll {
  padding: 20px 24px;
  max-height: 500px;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: #a0522d #f0ebe0;
}

.tip-scroll::-webkit-scrollbar {
  width: 8px;
}

.tip-scroll::-webkit-scrollbar-track {
  background: #f0ebe0;
  border-radius: 4px;
}

.tip-scroll::-webkit-scrollbar-thumb {
  background: #a0522d;
  border-radius: 4px;
}

.tip-item {
  padding: 14px 0;
  border-bottom: 1px solid rgba(160, 82, 45, 0.12);
}

.tip-item:last-child {
  border-bottom: none;
}

.tip-item strong {
  display: block;
  color: #8b1a1a;
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 6px;
  line-height: 1.4;
}

.tip-item p {
  font-size: 14px;
  color: #2d2d2d;
  line-height: 1.75;
  margin: 0;
}

/* 移动端适配 */
@media (max-width: 768px) {
  .tips-grid {
    gap: 10px;
  }
  
  .tip-header {
    padding: 16px 18px;
    font-size: 16px;
  }
  
  .tip-emoji {
    font-size: 22px;
  }
}

/* === 伊斯坦布尔地图 === */
.map-section {
  padding: 60px 0 80px;
  background: linear-gradient(180deg, 
    var(--sky-deep) 0%, 
    var(--sky-mid) 100%);
}

.map-section .section-subtitle {
  color: rgba(232, 200, 126, 0.7);
  margin-top: -36px;
}

.map-frame-container {
  max-width: 960px;
  margin: 0 auto;
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
  border: 2px solid rgba(160, 82, 45, 0.3);
}

.map-frame {
  width: 100%;
  height: 600px;
  border: none;
  display: block;
}

@media (max-width: 768px) {
  .map-section {
    padding: 40px 0 60px;
  }
  
  .map-frame {
    height: 450px;
  }
  
  .map-section .section-title {
    font-size: 28px;
  }
}

/* 地图全屏模式 */
.map-frame-container.fullscreen {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 9999;
  border-radius: 0;
  border: none;
  box-shadow: none;
  cursor: zoom-out;
  transition: all 0.3s ease;
}

.map-frame-container.fullscreen .map-frame {
  height: 100vh;
}

.map-frame-container::after {
  content: "双击放大";
  position: absolute;
  bottom: 16px;
  right: 16px;
  background: rgba(42, 31, 20, 0.8);
  color: #f0c27a;
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 12px;
  pointer-events: none;
  opacity: 0.7;
  transition: opacity 0.3s;
}

.map-frame-container:hover::after {
  opacity: 1;
}

.map-frame-container.fullscreen::after {
  content: "双击退出全屏";
}