:root {
  --accent: #0066ff;
  --accent2: #7c3aed;
  --grad: linear-gradient(135deg, #0066ff, #7c3aed);
  --bg: #ffffff;
  --bg2: #f5f7ff;
  --bg3: #eef1fb;
  --text: #0f172a;
  --text2: #334155;
  --gray: #64748b;
  --border: #e2e8f0;
  --serif: 'Noto Serif SC', serif;
  --sans: 'Noto Sans SC', sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  font-family: var(--sans);
  background: var(--bg);
  color: var(--text);
  overflow-x: hidden;
}

/* ── 导航 ── */
nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 6%;
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  box-shadow: 0 1px 20px rgba(0,0,0,0.06);
}

.nav-logo {
  font-family: var(--serif);
  font-size: 1.4rem;
  background: var(--grad);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: 0.15em;
  text-decoration: none;
}

.nav-links a {
  color: var(--gray);
  text-decoration: none;
  margin-left: 32px;
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  transition: color 0.3s;
}

.nav-links a:hover,
.nav-links a.active { color: var(--accent); }

/* ── 页面 Hero ── */
.page-hero {
  padding: 160px 6% 80px;
  background: var(--bg2);
  border-bottom: 1px solid var(--border);
  position: relative;
  overflow: hidden;
}

.page-hero::before {
  content: '';
  position: absolute;
  width: 500px; height: 500px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(0,102,255,0.08) 0%, transparent 70%);
  top: 0; right: 10%;
  pointer-events: none;
}

.page-label {
  font-size: 0.72rem;
  letter-spacing: 0.35em;
  background: var(--grad);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-transform: uppercase;
  margin-bottom: 16px;
}

.page-title {
  font-family: var(--serif);
  font-size: clamp(2rem, 5vw, 4rem);
  color: var(--text);
  line-height: 1.2;
  margin-bottom: 20px;
}

.page-title span {
  background: var(--grad);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.page-desc {
  color: var(--gray);
  font-size: 1rem;
  line-height: 1.9;
  max-width: 600px;
}

/* ── 通用内容区 ── */
.content-section {
  padding: 80px 6%;
}

.content-section + .content-section {
  border-top: 1px solid var(--border);
}

.section-label {
  font-size: 0.7rem;
  letter-spacing: 0.35em;
  background: var(--grad);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-transform: uppercase;
  margin-bottom: 12px;
}

.section-title {
  font-family: var(--serif);
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  color: var(--text);
  margin-bottom: 16px;
  line-height: 1.3;
}

.section-desc {
  color: var(--gray);
  font-size: 0.95rem;
  line-height: 1.9;
  max-width: 680px;
}

/* ── 卡片网格 ── */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 16px;
  margin-top: 48px;
}

.card {
  background: var(--bg);
  border: 1px solid var(--border);
  padding: 36px 28px;
  border-radius: 8px;
  transition: border-color 0.3s, transform 0.3s, box-shadow 0.3s;
}

.card:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
  box-shadow: 0 8px 32px rgba(0,102,255,0.1);
}

.card-icon { font-size: 2rem; margin-bottom: 16px; }

.card h3 {
  font-family: var(--serif);
  font-size: 1.15rem;
  color: var(--text);
  margin-bottom: 10px;
}

.card p {
  font-size: 0.88rem;
  color: var(--gray);
  line-height: 1.8;
}

.card-tag {
  display: inline-block;
  margin-top: 16px;
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  background: var(--grad);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  border-bottom: 1px solid rgba(0,102,255,0.3);
  padding-bottom: 2px;
}

/* ── 信息列表 ── */
.info-list {
  margin-top: 40px;
  display: flex;
  flex-direction: column;
  gap: 1px;
  background: var(--border);
}

.info-item {
  background: var(--bg2);
  padding: 28px 32px;
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 24px;
  align-items: start;
  transition: background 0.3s;
}

.info-item:hover { background: #fff; }

.info-label {
  font-size: 0.8rem;
  background: var(--grad);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: 0.1em;
  padding-top: 3px;
  font-weight: 500;
}

.info-value {
  font-size: 0.92rem;
  color: var(--text2);
  line-height: 1.8;
}

/* ── Footer ── */
footer {
  background: var(--text);
  padding: 60px 6% 40px;
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 40px;
  border-top: 3px solid transparent;
  border-image: var(--grad) 1;
}

.footer-brand p {
  font-size: 0.82rem;
  color: #64748b;
  line-height: 1.8;
  margin-top: 12px;
}

.footer-col h4 {
  font-size: 0.72rem;
  letter-spacing: 0.25em;
  background: var(--grad);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-transform: uppercase;
  margin-bottom: 20px;
}

.footer-col a {
  display: block;
  color: #64748b;
  text-decoration: none;
  font-size: 0.85rem;
  margin-bottom: 10px;
  transition: color 0.3s;
}

.footer-col a:hover { color: #fff; }

.footer-bottom {
  grid-column: 1 / -1;
  border-top: 1px solid rgba(255,255,255,0.08);
  padding-top: 28px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-bottom p { font-size: 0.78rem; color: #475569; }

/* ── 响应式 ── */

/* 汉堡菜单按钮 */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
  background: none;
  border: none;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: all 0.3s;
}

.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

@media (max-width: 768px) {
  .nav-toggle { display: flex; }

  .nav-links {
    display: none;
    position: fixed;
    top: 61px;
    left: 0; right: 0;
    background: rgba(255,255,255,0.97);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    padding: 12px 0 20px;
    box-shadow: 0 8px 24px rgba(0,0,0,0.08);
    z-index: 99;
  }

  .nav-links.open { display: flex; }

  .nav-links a {
    margin: 0;
    padding: 14px 6%;
    font-size: 1rem;
    border-bottom: 1px solid var(--border);
  }

  .nav-links a:last-child { border-bottom: none; }

  .page-hero { padding: 120px 5% 60px; }
  .content-section { padding: 60px 5%; }
  .info-item { grid-template-columns: 1fr; gap: 8px; }
  footer { grid-template-columns: 1fr 1fr; }
}

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

/* ── 图片组件 ── */
.img-hero {
  width: 100%;
  height: 520px;
  object-fit: cover;
  display: block;
  filter: brightness(0.85);
}

.img-banner {
  width: 100%;
  height: 360px;
  object-fit: cover;
  display: block;
  filter: brightness(0.82);
}

.img-card {
  width: 100%;
  height: 220px;
  object-fit: cover;
  display: block;
  filter: brightness(0.88);
  transition: filter 0.4s, transform 0.4s;
}

.img-card-wrap {
  overflow: hidden;
}

.img-card-wrap:hover .img-card {
  filter: brightness(1);
  transform: scale(1.04);
}

.photo-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 4px;
  margin: 48px 0;
}

.photo-grid-2 {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 4px;
  margin: 48px 0;
}

.photo-grid-tall {
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: 280px 280px;
  gap: 4px;
  margin: 48px 0;
}

.photo-grid-tall .img-span2 {
  grid-column: 1 / -1;
}

.photo-item {
  overflow: hidden;
  position: relative;
}

.photo-item img {
  width: 100%;
  height: 260px;
  object-fit: cover;
  display: block;
  transition: transform 0.5s ease, filter 0.4s;
  filter: brightness(0.85);
}

.photo-item:hover img {
  transform: scale(1.05);
  filter: brightness(1);
}

.photo-item.tall img { height: 380px; }
.photo-item.short img { height: 180px; }

.photo-caption {
  font-size: 0.72rem;
  color: #4a5568;
  letter-spacing: 0.1em;
  margin-top: 8px;
  text-align: center;
}

.img-full {
  width: 100%;
  height: 440px;
  object-fit: cover;
  display: block;
  filter: brightness(0.82);
  margin: 40px 0;
}

.img-inline {
  width: 100%;
  height: 300px;
  object-fit: cover;
  display: block;
  filter: brightness(0.85);
  margin: 32px 0;
}

.photo-credit {
  font-size: 0.7rem;
  color: #2d3748;
  text-align: right;
  margin-top: 4px;
  margin-bottom: 24px;
}

.photo-credit a {
  color: #2d3748;
  text-decoration: none;
}

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

@media (max-width: 768px) {
  .photo-grid { grid-template-columns: 1fr 1fr; }
  .photo-grid-2 { grid-template-columns: 1fr; }
  .img-hero { height: 320px; }
  .img-banner { height: 240px; }
  .img-full { height: 280px; }
}

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