/* 字体与全局设定：经典公共机构气质 */
:root {
  --ink: #0e1a2b; /* 墨黑/海军蓝 */
  --ink-2: #1d2c42; /* 次级深蓝 */
  --paper: #f7f4ef; /* 暖白米色 */
  --accent: #b99858; /* 铜金色点缀 */
  --line: #d8d2c6; /* 细分割线 */
  --muted: #6a7687;
  --maxw: 1120px;
}

* {
  box-sizing: border-box;
}
html,
body {
  height: 100%;
}
body {
  margin: 0;
  font-family: "Source Sans 3", system-ui, -apple-system, Segoe UI, Roboto,
    Arial, sans-serif;
  color: var(--ink);
  background: var(--paper);
  line-height: 1.65;
}

h1,
h2,
h3,
h4 {
  font-family: "Cormorant Garamond", Georgia, "Times New Roman", serif;
}
h1,
h2,
h3 {
  letter-spacing: 0.2px;
}

/* 站点头与导航 */
.site-header {
  border-bottom: 1px solid var(--line);
  background: linear-gradient(#fffdf8, #f6f2eb);
}
.brand {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 16px 16px 8px 16px;
  display: grid;
  grid-template-columns: 64px 1fr;
  gap: 12px;
  align-items: center;
}
.brand__logo {
  width: 64px;
  height: 64px;
  object-fit: cover;
  border-radius: 6px;
  border: 1px solid var(--line);
}
.brand__title {
  margin: 0;
  font-size: 28px;
  font-weight: 700;
  color: var(--ink);
}
.brand__subtitle {
  margin: 2px 0 0 0;
  color: var(--muted);
  font-size: 14px;
}

.site-nav ul {
  list-style: none;
  margin: 0 auto;
  padding: 6px 16px 12px 16px;
  max-width: var(--maxw);
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.site-nav a {
  text-decoration: none;
  color: var(--ink-2);
  padding: 6px 10px;
  border-radius: 4px;
}
.site-nav a:hover,
.site-nav a:focus {
  background: #efe9dc;
}

/* HERO：斜切分割 + 背景图（UI创新2） */
.hero {
  background: var(--ink);
  background-image: var(--hero);
  background-size: cover;
  background-position: center;
  color: #fff;
  position: relative;
}
.hero::after {
  /* 斜切分割伪元素 */
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -36px;
  height: 36px;
  background: linear-gradient(175deg, transparent 48%, var(--paper) 49%);
}
.hero__content {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 56px 16px 64px 16px;
}
.lead {
  font-size: 20px;
  max-width: 66ch;
}

/* 丝带标题（UI创新1） */
.ribbon {
  display: inline-block;
  padding: 6px 14px;
  background: var(--ink);
  color: #fff;
  border-left: 6px solid var(--accent);
  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.1);
}

/* 首字下沉（UI创新3） */
.dropcap::first-letter {
  font-family: "Cormorant Garamond", Georgia, serif;
  font-size: 3.2em;
  float: left;
  line-height: 0.9;
  padding: 8px 10px 0 0;
  color: #fff;
  font-weight: 700;
}

/* 通用分区 */
.section {
  padding: 48px 16px;
  position: relative;
}
.section--diagonal {
  background: linear-gradient(#fffdf8, #f6f2eb);
}
.section__header {
  max-width: var(--maxw);
  margin: 0 auto 16px auto;
}

.grid {
  max-width: var(--maxw);
  margin: 0 auto;
  display: grid;
  gap: 20px;
}
.grid--2 {
  grid-template-columns: 1fr 1fr;
}
.grid--3 {
  grid-template-columns: 1fr 1fr 1fr;
}

/* 卡片 */
.card {
  background: #fff;
  border: 1px solid var(--line);
  padding: 14px;
  border-radius: 8px;
}
.card h4 {
  margin-top: 10px;
}

/* 小图统一 clip-path 要求 + 比例统一 */
.thumb {
  width: 100%;
  display: block;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  clip-path: inset(0% 0% 5% 5%);
  border: 1px solid var(--line);
  border-radius: 6px;
}

/* 双色时间线（UI创新4） */
.timeline {
  background: linear-gradient(90deg, #f2eee6 50%, #ffffff 50%);
}
.timeline__list {
  list-style: none;
  margin: 0 auto;
  padding: 0;
  max-width: var(--maxw);
}
.timeline__entry {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  padding: 10px 0;
  border-bottom: 1px dashed var(--line);
}
.timeline__entry time {
  font-weight: 700;
  color: var(--ink-2);
}

/* Gallery */
.gallery {
  max-width: var(--maxw);
  margin: 0 auto;
  display: grid;
  gap: 20px;
  grid-template-columns: repeat(3, 1fr);
}
.gallery figure {
  margin: 0;
}
.gallery figcaption {
  font-size: 14px;
  color: var(--muted);
  margin-top: 6px;
}

/* 表单与按钮 */
.form {
  max-width: 720px;
  margin: 0 auto;
  display: grid;
  gap: 10px;
}
.form label {
  display: grid;
  gap: 6px;
}
.form input,
.form textarea {
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fff;
}
.cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  border: 1px solid var(--ink);
  background: var(--ink);
  color: #fff;
  border-radius: 6px;
  text-decoration: none;
  cursor: pointer;
}
.cta--quiet {
  background: transparent;
  color: var(--ink);
}
.cta--quiet:hover {
  background: #efe9dc;
}

/* 页脚 */
.site-footer {
  border-top: 1px solid var(--line);
  padding: 18px 16px;
  background: #fff;
}
.site-footer__inner {
  max-width: var(--maxw);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

/* 粘性侧边导航（可选 UI创新5：大屏展示） */
@media (min-width: 1200px) {
  .site-nav ul {
    position: sticky;
    top: 0;
    background: linear-gradient(#fffdf8, #f6f2eb);
    z-index: 2;
  }
}

/* 响应式栅格调整与更紧凑留白 */
@media (max-width: 960px) {
  .grid--3 {
    grid-template-columns: 1fr 1fr;
  }
  .timeline__entry {
    grid-template-columns: 1fr;
  }
  .gallery {
    grid-template-columns: 1fr 1fr;
  }
  .hero__content {
    padding: 48px 16px 54px 16px;
  }
  .section {
    padding: 42px 16px;
  }
}
@media (max-width: 640px) {
  .brand {
    grid-template-columns: 48px 1fr;
  }
  .brand__logo {
    width: 48px;
    height: 48px;
  }
  .grid--2,
  .grid--3 {
    grid-template-columns: 1fr;
  }
  .gallery {
    grid-template-columns: 1fr;
  }
  .hero__content {
    padding: 40px 16px 46px 16px;
  }
  .section {
    padding: 36px 16px;
  }
}