@import url('https://fonts.googleapis.com/css2?family=Abril+Fatface&family=Merriweather:wght@300;400;700&display=swap');

/* ===== 重置与基础 ===== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  scroll-padding-top: 130px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: 'Merriweather', Georgia, 'Times New Roman', serif;
  background: #f5f5f5;
  color: #1f1f1f;
  line-height: 1.7;
  min-height: 100vh;
  overflow-x: hidden;
}

/* ===== 品牌色变量 ===== */
:root {
  --c-white: #ffffff;
  --c-light: #f5f5f5;
  --c-dark: #1f1f1f;
  --c-border: #1f1f1f;
  --c-accent: #1f1f1f;
  --c-accent-light: #e8e8e8;
  --radius-card: 28px;
  --radius-sm: 12px;
  --gap: 16px;
  --transition: 0.28s cubic-bezier(0.4, 0, 0.2, 1);
  --header-h: 64px;
  --sticky-h: 44px;
}

/* ===== 包裹层 ===== */
.site-wrapper {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* ===== 顶部公告条 ===== */
.top-announcement {
  background: var(--c-dark);
  color: var(--c-white);
  text-align: center;
  padding: 8px 24px;
  font-family: 'Merriweather', serif;
  font-size: 13px;
  font-weight: 300;
  letter-spacing: 0.04em;
  position: relative;
  z-index: 100;
}

/* ===== 主导航：details > summary + menu > li > a ===== */
.site-header {
  background: var(--c-white);
  border-bottom: 2px solid var(--c-dark);
  position: sticky;
  top: 0;
  z-index: 90;
}

.nav-details {
  width: 100%;
}

.nav-summary {
  list-style: none;
  cursor: default;
  display: block;
}

.nav-summary::-webkit-details-marker {
  display: none;
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
  height: var(--header-h);
  gap: 24px;
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: 4px;
  flex: 1;
  padding: 0;
  margin: 0;
}

.nav-left {
  justify-content: flex-end;
}

.nav-right {
  justify-content: flex-start;
}

.nav-brand {
  flex-shrink: 0;
  text-align: center;
}

.brand-logo {
  text-decoration: none;
  display: flex;
  align-items: center;
}

.brand-text {
  font-family: 'Abril Fatface', Georgia, serif;
  font-size: 22px;
  color: var(--c-dark);
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.logo-img {
  height: 44px;
  width: auto;
}

.nav-link {
  display: flex;
  align-items: center;
  padding: 10px 12px;
  font-family: 'Merriweather', serif;
  font-size: 13px;
  font-weight: 400;
  color: var(--c-dark);
  text-decoration: none;
  border-radius: var(--radius-sm);
  border: 1.5px solid transparent;
  transition: border-color var(--transition), background var(--transition);
  white-space: nowrap;
  min-height: 44px;
}

.nav-link:hover,
.nav-link:focus-visible {
  border-color: var(--c-dark);
  background: var(--c-light);
  outline: none;
}

.nav-mobile-menu {
  display: none;
  flex-direction: column;
  list-style: none;
  padding: 12px 24px 16px;
  gap: 4px;
  border-top: 1px solid var(--c-accent-light);
  margin: 0;
}

.nav-mobile-menu .nav-link {
  width: 100%;
  padding: 12px 16px;
  min-height: 48px;
}

.nav-details[open] .nav-mobile-menu {
  display: flex;
}

/* ===== 粘性锚点条 ===== */
.sticky-nav {
  background: var(--c-light);
  border-bottom: 1.5px solid var(--c-dark);
  position: sticky;
  top: var(--header-h);
  z-index: 80;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.sticky-list {
  display: flex;
  list-style: none;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
  gap: 0;
}

.sticky-link {
  display: flex;
  align-items: center;
  padding: 0 14px;
  height: var(--sticky-h);
  min-height: 44px;
  font-family: 'Merriweather', serif;
  font-size: 13px;
  color: var(--c-dark);
  text-decoration: none;
  border-bottom: 3px solid transparent;
  transition: border-color var(--transition), background var(--transition);
  white-space: nowrap;
}

.sticky-link:hover,
.sticky-link:focus-visible {
  border-bottom-color: var(--c-dark);
  background: var(--c-accent-light);
  outline: none;
}

/* ===== Hero ===== */
.hero-section {
  position: relative;
  min-height: 45vh;
  background: var(--c-white);
  border-bottom: 2px solid var(--c-dark);
  overflow: hidden;
  display: flex;
  align-items: center;
}

.hero-grid-bg {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(31,31,31,0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(31,31,31,0.06) 1px, transparent 1px);
  background-size: 32px 32px;
  pointer-events: none;
}

.hero-inner {
  position: relative;
  max-width: 1280px;
  margin: 0 auto;
  padding: 48px 24px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
  width: 100%;
}

.hero-text {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.hero-title {
  font-family: 'Abril Fatface', Georgia, serif;
  font-size: clamp(28px, 5vw, 52px);
  line-height: 1.15;
  color: var(--c-dark);
  letter-spacing: 0.01em;
}

.hero-desc {
  font-size: 16px;
  font-weight: 300;
  color: #444;
  line-height: 1.7;
  max-width: 480px;
}

.hero-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 32px;
  background: var(--c-dark);
  color: var(--c-white);
  font-family: 'Merriweather', serif;
  font-size: 15px;
  font-weight: 700;
  text-decoration: none;
  border-radius: var(--radius-card);
  border: 2px solid var(--c-dark);
  transition: background var(--transition), color var(--transition);
  align-self: flex-start;
  min-height: 48px;
}

.hero-cta:hover,
.hero-cta:focus-visible {
  background: var(--c-white);
  color: var(--c-dark);
  outline: none;
}

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

.hero-card-mock {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  grid-auto-rows: 90px;
  gap: var(--gap);
  width: 100%;
  max-width: 360px;
}

.mock-tile {
  border-radius: var(--radius-card);
  border: 2px solid var(--c-dark);
  background: var(--c-light);
}

.mock-tile--lg {
  grid-column: span 2;
  grid-row: span 2;
  background: var(--c-dark);
}

.mock-tile--sm {
  grid-column: span 1;
}

.mock-tile--md {
  grid-column: span 2;
}

/* ===== 主内容 + 侧边栏 ===== */
.site-main {
  flex: 1;
  padding: 48px 24px;
}

.content-with-aside {
  max-width: 1280px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 32px;
  align-items: start;
}

.main-article {
  min-width: 0;
}

/* ===== Bento Box 内容区 ===== */
.bento-content article {
  margin-bottom: 48px;
}

.bento-content h2 {
  font-family: 'Abril Fatface', Georgia, serif;
  font-size: clamp(22px, 3.5vw, 36px);
  color: var(--c-dark);
  margin-bottom: 12px;
  line-height: 1.2;
}

.bento-content h2 + hr,
.bento-content h3 + hr {
  border: none;
  border-top: 2px solid var(--c-dark);
  margin-bottom: 24px;
}

.bento-content h3 {
  font-family: 'Abril Fatface', Georgia, serif;
  font-size: clamp(18px, 2.5vw, 26px);
  color: var(--c-dark);
  margin-bottom: 10px;
  margin-top: 28px;
  line-height: 1.3;
}

.bento-content p {
  font-size: 16px;
  line-height: 1.75;
  color: #2a2a2a;
  margin-bottom: 16px;
}

.bento-content ul,
.bento-content ol {
  padding-left: 24px;
  margin-bottom: 16px;
}

.bento-content li {
  font-size: 16px;
  line-height: 1.75;
  margin-bottom: 8px;
}

.bento-content a {
  color: var(--c-dark);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.bento-content a:hover {
  text-decoration: none;
}

.bento-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-auto-rows: minmax(160px, auto);
  gap: var(--gap);
  margin-top: 24px;
  margin-bottom: 32px;
}

.bento-card {
  background: var(--c-white);
  border: 2px solid var(--c-dark);
  border-radius: var(--radius-card);
  padding: 24px;
  transition: transform var(--transition);
  position: relative;
  overflow: hidden;
}

.bento-card:hover {
  transform: scale(1.02);
}

.bento-card--span2 {
  grid-column: span 2;
}

.bento-card--span3 {
  grid-column: span 3;
}

.bento-card--tall {
  grid-row: span 2;
}

.bento-card--dark {
  background: var(--c-dark);
  color: var(--c-white);
}

.bento-card--dark h3,
.bento-card--dark p {
  color: var(--c-white);
}

/* ===== 侧边栏 ===== */
.site-aside {
  display: flex;
  flex-direction: column;
  gap: 20px;
  position: sticky;
  top: 130px;
}

.aside-card {
  background: var(--c-white);
  border: 2px solid var(--c-dark);
  border-radius: var(--radius-card);
  padding: 24px;
}

.aside-card--highlight {
  background: var(--c-dark);
  color: var(--c-white);
}

.aside-title {
  font-family: 'Abril Fatface', Georgia, serif;
  font-size: 18px;
  color: var(--c-dark);
  margin-bottom: 10px;
}

.aside-subtitle {
  font-family: 'Abril Fatface', Georgia, serif;
  font-size: 16px;
  color: var(--c-white);
  margin-bottom: 10px;
}

.aside-card hr {
  border: none;
  border-top: 1.5px solid var(--c-dark);
  margin-bottom: 16px;
}

.aside-card--highlight hr {
  border-top-color: rgba(255,255,255,0.3);
}

.aside-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.aside-link {
  display: flex;
  align-items: center;
  padding: 8px 10px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  color: var(--c-dark);
  text-decoration: none;
  border: 1.5px solid transparent;
  transition: border-color var(--transition), background var(--transition);
  min-height: 44px;
}

.aside-link:hover,
.aside-link:focus-visible {
  border-color: var(--c-dark);
  background: var(--c-light);
  outline: none;
}

.aside-note {
  font-size: 14px;
  line-height: 1.65;
  color: rgba(255,255,255,0.85);
}

/* ===== 页脚 ===== */
.site-footer {
  background: var(--c-dark);
  color: var(--c-white);
  border-top: 2px solid var(--c-dark);
}

.footer-top {
  padding: 48px 24px 0;
  text-align: center;
  overflow: hidden;
}

.footer-brand-giant {
  font-family: 'Abril Fatface', Georgia, serif;
  font-size: clamp(48px, 10vw, 120px);
  line-height: 1;
  color: rgba(255,255,255,0.08);
  letter-spacing: -0.02em;
  user-select: none;
  margin-bottom: -20px;
}

.footer-columns {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  max-width: 1280px;
  margin: 0 auto;
  padding: 40px 24px;
}

.footer-col-title {
  font-family: 'Abril Fatface', Georgia, serif;
  font-size: 16px;
  color: var(--c-white);
  margin-bottom: 14px;
  letter-spacing: 0.02em;
}

.footer-col-text {
  font-size: 14px;
  line-height: 1.7;
  color: rgba(255,255,255,0.65);
}

.footer-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.footer-link {
  font-size: 14px;
  color: rgba(255,255,255,0.7);
  text-decoration: none;
  transition: color var(--transition);
  padding: 8px 0;
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  line-height: 1.5;
}

.footer-link:hover,
.footer-link:focus-visible {
  color: var(--c-white);
  outline: none;
}

.footer-address {
  font-style: normal;
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.12);
  text-align: center;
  padding: 20px 24px;
}

.footer-copy {
  font-size: 13px;
  color: rgba(255,255,255,0.4);
  font-weight: 300;
}

/* ===== Scroll Reveal 动效 ===== */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
  html {
    scroll-behavior: auto;
  }
  .bento-card:hover {
    transform: none;
  }
}

/* ===== 图片 ===== */
img {
  max-width: 100%;
  height: auto;
  display: block;
}

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

  .bento-card--span3 {
    grid-column: span 2;
  }

  .content-with-aside {
    grid-template-columns: 1fr 260px;
  }
}

@media (max-width: 768px) {
  :root {
    --header-h: 56px;
  }

  html {
    scroll-padding-top: 108px;
  }

  .nav-inner {
    padding: 0 16px;
  }

  .nav-menu.nav-left,
  .nav-menu.nav-right {
    display: none;
  }

  .nav-summary {
    cursor: pointer;
  }

  .nav-brand {
    flex: 1;
    text-align: center;
  }

  .brand-text {
    font-size: 18px;
  }

  .sticky-list {
    padding: 0 12px;
  }

  .sticky-link {
    padding: 0 10px;
    font-size: 12px;
  }

  .hero-inner {
    grid-template-columns: 1fr;
    padding: 32px 16px;
    gap: 24px;
  }

  .hero-visual {
    display: none;
  }

  .hero-title {
    font-size: clamp(24px, 7vw, 38px);
  }

  .hero-desc {
    font-size: 15px;
  }

  .content-with-aside {
    grid-template-columns: 1fr;
  }

  .site-aside {
    position: static;
  }

  .site-main {
    padding: 32px 16px;
  }

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

  .bento-card--span2,
  .bento-card--span3 {
    grid-column: span 1;
  }

  .bento-card--tall {
    grid-row: span 1;
  }

  .footer-columns {
    grid-template-columns: 1fr;
    gap: 24px;
    padding: 32px 16px;
  }

  .footer-brand-giant {
    font-size: clamp(40px, 14vw, 80px);
  }
}

@media (max-width: 480px) {
  .top-announcement {
    font-size: 12px;
    padding: 6px 12px;
  }

  .nav-inner {
    padding: 0 12px;
  }

  .hero-cta {
    width: 100%;
    text-align: center;
    justify-content: center;
  }
}

button[aria-expanded]{min-width:44px;min-height:44px}