:root {
  --brand-navy: #0f2a43;
  --brand-gold: #c6a664;
  --brand-ivory: #f5f2eb;
  --text: #2f2f2f;
  --muted: #6f6f6f;
  --divider: rgba(15, 42, 67, 0.15);
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.06), 0 8px 24px rgba(0, 0, 0, 0.06);
  --radius: 10px;
  --space: clamp(12px, 2.5vw, 22px);
}

/* 全局排版与基础重置 */
* {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
}
body {
  margin: 0;
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, Arial,
    sans-serif;
  color: var(--text);
  background: var(--brand-ivory);
  line-height: 1.6;
  font-size: 16px;
}
img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* 可复用容器与网格 */
.container {
  width: min(1100px, 92%);
  margin-inline: auto;
}
.section {
  padding: clamp(40px, 7vw, 80px) 0;
}

/* 顶部信息条 */
.topbar {
  background: var(--brand-navy);
  color: #fff;
  font-size: 0.9rem;
}
.topbar .container {
  display: flex;
  gap: 18px;
  align-items: center;
  padding: 0.4rem 0;
}
.topbar i {
  margin-right: 0.35rem;
  color: var(--brand-gold);
}

/* 头部与导航 */
.site-header {
  background: #fff;
  border-bottom: 1px solid var(--divider);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.8rem 0;
}
.brand {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  color: inherit;
  text-decoration: none;
}
.logo {
  width: 42px;
  height: 42px;
  object-fit: cover;
  border-radius: 6px;
}
.brand strong {
  font-family: Merriweather, serif;
  font-weight: 700;
  letter-spacing: 0.3px;
}
.site-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: clamp(10px, 2.2vw, 22px);
}
.site-nav a {
  color: var(--text);
  text-decoration: none;
  padding: 0.4rem 0.2rem;
  border-bottom: 2px solid transparent;
}
.site-nav a:hover,
.site-nav a:focus {
  border-color: var(--brand-gold);
}

/* Hero 区（大背景图，不裁切小图规则不适用） */
.hero {
  position: relative;
  isolation: isolate;
}
.hero-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  filter: grayscale(0.2) contrast(1.05);
  z-index: -1;
}
.hero-content {
  padding: clamp(60px, 12vw, 160px) 0;
  color: #fff;
}
.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    180deg,
    rgba(15, 42, 67, 0.6),
    rgba(15, 42, 67, 0.55)
  );
  z-index: -1;
}
.hero h1 {
  font-family: Merriweather, serif;
  font-size: clamp(28px, 4.8vw, 48px);
  margin: 0 0 0.5rem;
}
.hero p {
  max-width: 720px;
  font-size: clamp(14px, 2.2vw, 18px);
}
.hero-cta {
  display: flex;
  gap: 14px;
  margin-top: 1rem;
}
.btn {
  display: inline-block;
  border-radius: 8px;
  padding: 0.7rem 1rem;
  text-decoration: none;
  font-weight: 600;
}
.btn-primary {
  background: var(--brand-gold);
  color: #fff;
  box-shadow: var(--shadow);
}
.btn-outline {
  border: 2px solid #fff;
  color: #fff;
}

/* Features 对称分栏 + 垂直分隔线（创新#3） */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  border: 1px solid var(--divider);
  border-radius: var(--radius);
  overflow: hidden;
  background: #fff;
}
.feature-card {
  padding: clamp(18px, 3vw, 28px);
  text-align: center;
}
.feature-card + .feature-card {
  border-left: 1px solid var(--divider);
}
.feature-card i {
  font-size: 26px;
  color: var(--brand-gold);
}
.feature-card h3 {
  margin: 0.6rem 0 0.3rem;
  font-family: Merriweather, serif;
}

/* Gallery 小图裁切（通用小图样式要求） */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.gallery-item img {
  clip-path: inset(0% 0% 5% 5%);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

/* About 首字下沉（创新#1） + 丝带标题（创新#2） */
.ribbon {
  position: relative;
  display: inline-block;
  padding: 0.4rem 0.8rem;
  background: #fff;
  border: 1px solid var(--divider);
  border-radius: 6px;
  font-family: Merriweather, serif;
}
.ribbon::before,
.ribbon::after {
  content: "";
  position: absolute;
  top: 100%;
  width: 14px;
  height: 14px;
  background: linear-gradient(135deg, transparent 50%, rgba(0, 0, 0, 0.08) 50%);
}
.ribbon::before {
  left: 8px;
  transform: skewX(-35deg);
}
.ribbon::after {
  right: 8px;
  transform: skewX(35deg);
}
.dropcap::first-letter {
  float: left;
  font-family: Merriweather, serif;
  font-size: 3.2rem;
  line-height: 1;
  padding: 0.2rem 0.4rem 0 0;
  color: var(--brand-gold);
}
.about-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 22px;
}

/* Grants */
.grants-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 22px;
}
.faq {
  margin-top: 10px;
  background: #fff;
  border: 1px solid var(--divider);
  border-radius: 8px;
  padding: 0.8rem;
}
.faq summary {
  cursor: pointer;
  font-weight: 600;
}

/* Heritage 时间轴与纸面质感卡片（创新#5） */
.timeline {
  border-left: 2px solid var(--brand-gold);
  margin: 8px 0 18px 8px;
  padding-left: 18px;
}
.timeline-item {
  position: relative;
  margin: 10px 0;
}
.timeline-item::before {
  content: "";
  position: absolute;
  left: -27px;
  top: 0.4rem;
  width: 10px;
  height: 10px;
  border: 2px solid var(--brand-gold);
  background: #fff;
  border-radius: 50%;
}
.card-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
}
.paper-card {
  background: #fff;
  border: 1px solid var(--divider);
  border-radius: 10px;
  padding: 14px;
  box-shadow: var(--shadow);
  transition: transform 0.2s ease, filter 0.2s ease;
}
.paper-card:hover {
  transform: translateY(-3px);
  filter: contrast(1.02);
}
.paper-card::after {
  /* 纸面噪点纹理 */
  content: "";
  display: block;
  height: 0;
  pointer-events: none;
}

/* Subscribe 表单与切角浮雕按钮（创新#4） */
.form {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}
.form label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 260px;
  flex: 1;
}
.form input {
  padding: 0.7rem 0.8rem;
  border: 1px solid var(--divider);
  border-radius: 8px;
  background: #fff;
}
.btn-emboss {
  background: var(--brand-gold);
  color: #fff;
  border: none;
  padding: 0.75rem 1.1rem;
  border-radius: 10px;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.35),
    0 2px 0 rgba(0, 0, 0, 0.08), 0 10px 18px rgba(0, 0, 0, 0.08);
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 0 100%);
}
.btn-emboss:hover {
  filter: brightness(1.03);
}

/* Contact 地图占位 */
.map-placeholder {
  height: 220px;
  border: 1px dashed var(--divider);
  border-radius: 8px;
  background: repeating-linear-gradient(
    45deg,
    #f9f9f9,
    #f9f9f9 10px,
    #f1f1f1 10px,
    #f1f1f1 20px
  );
}

/* 页脚 */
.site-footer {
  border-top: 1px solid var(--divider);
  background: #fff;
}
.site-footer .container {
  padding: 16px 0;
  text-align: center;
  color: var(--muted);
}

/* 响应式调整 */
@media (max-width: 900px) {
  .features-grid {
    grid-template-columns: 1fr;
  }
  .feature-card + .feature-card {
    border-left: none;
    border-top: 1px solid var(--divider);
  }
  .about-grid,
  .grants-grid,
  .card-grid {
    grid-template-columns: 1fr;
  }
}