@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+TC:wght@300;400;500;700&family=Noto+Serif+TC:wght@400;500;600;700&display=swap');

/* ===== 设计令牌 ===== */
:root {
  --c-bg: #1a1a2e;
  --c-accent: #e94560;
  --c-ink: #f5f5f0;
  --c-bg2: #16213e;
  --c-bg3: #0f3460;
  --c-ink-dim: rgba(245,245,240,0.6);
  --c-ink-faint: rgba(245,245,240,0.15);
  --c-accent-dim: rgba(233,69,96,0.18);
  --c-accent-glow: rgba(233,69,96,0.35);
  --r-card: 28px;
  --nav-h: 60px;
  --font-serif: 'Noto Serif TC', 'Georgia', serif;
  --font-sans: 'Noto Sans TC', system-ui, sans-serif;
  --ease-out: cubic-bezier(0.22,1,0.36,1);
}

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

html {
  scroll-behavior: smooth;
  background: var(--c-bg);
  color: var(--c-ink);
}

body {
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.75;
  background: var(--c-bg);
  color: var(--c-ink);
  overflow-x: hidden;
  padding-bottom: var(--nav-h);
}

a { color: var(--c-accent); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--c-ink); }
img { display: block; max-width: 100%; height: auto; }
ul, ol { list-style: none; }

/* ===== 底部固定导航条 ===== */
.nav-bar-fixed {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 200;
  height: var(--nav-h);
  background: rgba(26,26,46,0.97);
  backdrop-filter: blur(12px);
  border-top: 1px solid var(--c-ink-faint);
  display: flex;
  align-items: center;
  gap: 0;
  padding: 0 16px;
}

.nav-brand-fixed {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--c-ink);
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 15px;
  white-space: nowrap;
  min-height: 44px;
  padding: 0 8px 0 0;
  border-right: 1px solid var(--c-ink-faint);
  margin-right: 12px;
  flex-shrink: 0;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  background: var(--c-accent);
  color: #fff;
  font-size: 14px;
  border-radius: 6px;
  font-family: var(--font-serif);
  font-weight: 700;
}

.nav-brand-fixed .brand-text { display: none; }

.nav-links-flat {
  display: flex;
  align-items: center;
  gap: 0;
  flex: 1;
  overflow-x: auto;
  scrollbar-width: none;
}
.nav-links-flat::-webkit-scrollbar { display: none; }

.flat-link {
  color: var(--c-ink-dim);
  font-size: 13px;
  padding: 0 10px;
  min-height: 44px;
  display: flex;
  align-items: center;
  white-space: nowrap;
  transition: color 0.2s;
  flex-shrink: 0;
}
.flat-link:hover, .flat-link.active { color: var(--c-ink); }

.nav-cta {
  flex-shrink: 0;
  background: var(--c-accent);
  color: #fff;
  font-size: 13px;
  font-weight: 700;
  padding: 0 14px;
  min-height: 40px;
  border-radius: 20px;
  display: flex;
  align-items: center;
  white-space: nowrap;
  margin-left: 8px;
  transition: background 0.2s, transform 0.15s;
}
.nav-cta:hover { background: #c73652; color: #fff; transform: scale(1.04); }

/* ===== details/summary 导航（结构抽签要求） ===== */
.nav-details {
  display: none;
}
.nav-details[open] {
  display: block;
  position: fixed;
  inset: 0;
  z-index: 300;
  background: rgba(26,26,46,0.98);
}
.nav-summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  cursor: pointer;
  list-style: none;
  border-bottom: 1px solid var(--c-ink-faint);
  min-height: 56px;
}
.nav-summary::-webkit-details-marker { display: none; }
.nav-summary .nav-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--c-ink);
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 16px;
}
.nav-toggle-icon {
  width: 24px;
  height: 2px;
  background: var(--c-ink);
  position: relative;
}
.nav-toggle-icon::before,
.nav-toggle-icon::after {
  content: '';
  position: absolute;
  width: 24px;
  height: 2px;
  background: var(--c-ink);
  left: 0;
}
.nav-toggle-icon::before { top: -7px; }
.nav-toggle-icon::after { top: 7px; }

.nav-menu {
  padding: 24px 20px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.nav-menu li a {
  display: block;
  padding: 14px 16px;
  color: var(--c-ink);
  font-size: 15px;
  border-radius: 10px;
  min-height: 48px;
  display: flex;
  align-items: center;
  transition: background 0.2s;
}
.nav-menu li a:hover { background: var(--c-accent-dim); color: var(--c-accent); }

/* ===== 站点骨架 ===== */
.site-wrap {
  min-height: 100vh;
}

/* ===== Hero（首页全屏） ===== */
.hero-section {
  position: relative;
  width: 100%;
  min-height: 100vh;
  display: flex;
  align-items: flex-end;
  padding-bottom: calc(var(--nav-h) + 60px);
  overflow: hidden;
}

.hero-media {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-bg-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(26,26,46,0.92) 0%, rgba(26,26,46,0.55) 60%, rgba(26,26,46,0.75) 100%);
}

.hero-body {
  position: relative;
  z-index: 1;
  max-width: 760px;
  padding: 40px 24px;
  display: flex;
  flex-direction: column;
  gap: 20px;
  align-items: flex-start;
}

.hero-badge {
  display: inline-block;
  padding: 5px 14px;
  border: 1px solid var(--c-accent);
  border-radius: 20px;
  color: var(--c-accent);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.kinetic-h1 {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(2rem, 6vw, 4rem);
  line-height: 1.2;
  color: var(--c-ink);
  animation: fadeInUp 0.9s var(--ease-out) both;
}

.hero-title {
  background: linear-gradient(135deg, var(--c-ink) 0%, rgba(245,245,240,0.8) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-lead {
  font-size: 17px;
  color: var(--c-ink-dim);
  max-width: 560px;
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 8px;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  min-height: 48px;
  padding: 0 28px;
  background: var(--c-accent);
  color: #fff;
  font-weight: 700;
  font-size: 15px;
  border-radius: 24px;
  transition: background 0.2s, transform 0.15s, box-shadow 0.2s;
}
.btn-primary:hover {
  background: #c73652;
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 8px 24px var(--c-accent-glow);
}

.btn-ghost {
  display: inline-flex;
  align-items: center;
  min-height: 48px;
  padding: 0 24px;
  border: 1.5px solid var(--c-ink-faint);
  color: var(--c-ink);
  font-size: 15px;
  border-radius: 24px;
  transition: border-color 0.2s, background 0.2s;
}
.btn-ghost:hover {
  border-color: var(--c-accent);
  color: var(--c-accent);
  background: var(--c-accent-dim);
}

/* ===== 布局系统 ===== */
.content-section {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 48px 24px;
}

.page-content-wrap {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 48px;
  align-items: start;
}

/* 侧边栏在左 */
.sidebar-left {
  position: sticky;
  top: 24px;
}

.aside-inner {
  background: var(--c-bg2);
  border-radius: 20px;
  padding: 24px;
  border: 1px solid var(--c-ink-faint);
}

.aside-title {
  font-family: var(--font-serif);
  font-size: 16px;
  font-weight: 700;
  color: var(--c-ink);
  margin-bottom: 4px;
}

.aside-nav-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin-top: 12px;
}

.aside-nav-list li a {
  display: block;
  padding: 10px 12px;
  color: var(--c-ink-dim);
  font-size: 14px;
  border-radius: 10px;
  min-height: 40px;
  display: flex;
  align-items: center;
  transition: background 0.2s, color 0.2s;
  line-height: 1.4;
}
.aside-nav-list li a:hover {
  background: var(--c-accent-dim);
  color: var(--c-accent);
}

.aside-parent {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--c-ink-faint);
}
.parent-link {
  font-size: 13px;
  color: var(--c-ink-dim);
}
.parent-link:hover { color: var(--c-accent); }

.aside-extra {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--c-ink-faint);
}
.aside-extra-link {
  font-size: 13px;
  color: var(--c-ink-dim);
}

.main-content-area {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

/* ===== 内容正文 ===== */
.content-figure {
  background: var(--c-bg2);
  border-radius: var(--r-card);
  border: 1px solid var(--c-ink-faint);
  overflow: hidden;
}

.prose {
  padding: 32px;
  font-family: var(--font-serif);
  font-size: 17px;
  line-height: 1.85;
  color: var(--c-ink);
}

.prose h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin: 2em 0 0.5em;
  color: var(--c-ink);
  border-left: 3px solid var(--c-accent);
  padding-left: 12px;
}
.prose h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin: 1.5em 0 0.4em;
  color: var(--c-ink);
}
.prose p { margin-bottom: 1.2em; }
.prose a { color: var(--c-accent); border-bottom: 1px solid var(--c-accent-dim); }
.prose a:hover { border-bottom-color: var(--c-accent); }
.prose ul, .prose ol {
  margin: 1em 0 1em 1.5em;
  list-style: disc;
  display: block;
}
.prose ol { list-style: decimal; }
.prose li { margin-bottom: 0.5em; }
.prose blockquote {
  border-left: 3px solid var(--c-accent);
  padding: 12px 20px;
  margin: 1.5em 0;
  background: var(--c-accent-dim);
  border-radius: 0 12px 12px 0;
  color: var(--c-ink-dim);
  font-style: italic;
}
.prose strong { color: var(--c-ink); font-weight: 700; }
.prose time { color: var(--c-accent); font-style: normal; }

/* ===== 首页专题卡片区 ===== */
.topics-section {
  max-width: 1200px;
  margin: 0 auto;
  padding: 48px 24px;
}

.section-header {
  margin-bottom: 32px;
}

.kinetic-h2 {
  font-family: var(--font-serif);
  font-size: clamp(1.5rem, 3.5vw, 2.2rem);
  font-weight: 700;
  color: var(--c-ink);
  animation: fadeInUp 0.7s var(--ease-out) both;
}

h2 + .subtitle, h2 + p.subtitle {
  margin-top: 6px;
}

.subtitle, p.subtitle {
  color: var(--c-ink-dim);
  font-size: 15px;
  line-height: 1.6;
}

.topics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
}

.topic-card {
  border-radius: var(--r-card);
  background: var(--c-bg2);
  border: 1px solid var(--c-ink-faint);
  border-bottom: 3px solid var(--c-accent);
  overflow: hidden;
  transition: transform 0.25s var(--ease-out), box-shadow 0.25s;
}
.topic-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0,0,0,0.4);
}

.card-link {
  display: block;
  color: inherit;
  text-decoration: none;
  height: 100%;
}
.card-link:hover { color: inherit; }

.card-inner {
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-height: 180px;
}

.card-eyebrow {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--c-accent);
  text-transform: uppercase;
}

.topic-card h3 {
  font-family: var(--font-serif);
  font-size: 17px;
  font-weight: 700;
  color: var(--c-ink);
  line-height: 1.4;
}

.card-desc {
  font-size: 14px;
  color: var(--c-ink-dim);
  flex: 1;
  line-height: 1.6;
}

.card-foot {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 8px;
  padding-top: 12px;
  border-top: 1px solid var(--c-ink-faint);
}

.card-count { font-size: 12px; color: var(--c-ink-dim); }
.card-arrow { color: var(--c-accent); font-size: 18px; }

/* ===== 近期文章 dl 列表 ===== */
.recent-section {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px 48px;
}

.recent-dl {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
}

.recent-dl dt {
  padding: 16px 20px 4px;
  border-top: 1px solid var(--c-ink-faint);
}
.recent-dl dt:nth-child(4n+1), .recent-dl dt:nth-child(4n+3) {
  background: var(--c-bg2);
}
.recent-dl dt a {
  font-family: var(--font-serif);
  font-size: 15px;
  font-weight: 600;
  color: var(--c-ink);
}
.recent-dl dt a:hover { color: var(--c-accent); }

.recent-dl dd {
  padding: 4px 20px 16px;
  font-size: 13px;
  color: var(--c-ink-dim);
  line-height: 1.5;
  border-top: 1px solid var(--c-ink-faint);
}
.recent-dl dd:nth-child(4n+2), .recent-dl dd:nth-child(4n+4) {
  background: var(--c-bg2);
}

/* ===== 专题页 Hero ===== */
.topic-hero, .about-hero, .privacy-hero {
  background: var(--c-bg2);
  border-bottom: 1px solid var(--c-ink-faint);
  padding: 80px 24px 48px;
}

.topic-hero-inner, .about-hero-inner, .privacy-hero-inner {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.topic-h1 {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
}

.topic-lead {
  font-size: 16px;
  color: var(--c-ink-dim);
  max-width: 600px;
}

.topic-count-badge {
  display: inline-block;
  padding: 4px 12px;
  background: var(--c-accent-dim);
  border: 1px solid var(--c-accent);
  border-radius: 12px;
  color: var(--c-accent);
  font-size: 13px;
  font-weight: 600;
}

/* ===== 子页 dl 列表（专题页） ===== */
.sub-dl {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.sub-dl dt {
  padding: 16px 20px 6px;
  background: var(--c-bg2);
  border-top: 1px solid var(--c-ink-faint);
}
.sub-dl dt:first-child { border-top: none; }
.sub-dl dt a {
  font-family: var(--font-serif);
  font-size: 16px;
  font-weight: 600;
  color: var(--c-ink);
}
.sub-dl dt a:hover { color: var(--c-accent); }

.sub-dl dd {
  padding: 4px 20px 16px;
  background: var(--c-bg2);
  font-size: 14px;
  color: var(--c-ink-dim);
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.article-date {
  color: var(--c-accent);
  font-size: 12px;
  font-weight: 600;
}

.dd-desc { line-height: 1.5; }

.sub-index-aside {
  background: var(--c-bg2);
  border-radius: var(--r-card);
  border: 1px solid var(--c-ink-faint);
  border-bottom: 3px solid var(--c-accent);
  overflow: hidden;
  padding: 28px;
}

.sub-index-aside h2 {
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 700;
  color: var(--c-ink);
  margin-bottom: 4px;
}

/* ===== 文章页 ===== */
.article-main, .topic-main, .about-main, .privacy-main {
  padding-top: 0;
}

.article-header-section {
  background: var(--c-bg2);
  border-bottom: 1px solid var(--c-ink-faint);
  padding: 80px 24px 48px;
}

.article-header-inner {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.article-hero-figure {
  border-radius: 16px;
  overflow: hidden;
  max-height: 360px;
}

.article-hero-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.article-h1 {
  font-size: clamp(1.6rem, 3.5vw, 2.4rem);
  line-height: 1.25;
}

.article-meta {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

.meta-item {
  font-size: 13px;
  color: var(--c-ink-dim);
}
.meta-item time { color: var(--c-accent); }

/* ===== 相关文章 aside ===== */
.related-aside, .about-links-aside, .privacy-links-aside {
  background: var(--c-bg2);
  border-radius: var(--r-card);
  border: 1px solid var(--c-ink-faint);
  border-bottom: 3px solid var(--c-accent);
  padding: 28px;
}

.related-aside h2, .about-links-aside h2, .privacy-links-aside h2 {
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 700;
  color: var(--c-ink);
  margin-bottom: 4px;
}

.related-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin-top: 16px;
}

.related-item a {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 12px 14px;
  border-radius: 12px;
  color: var(--c-ink);
  transition: background 0.2s;
}
.related-item a:hover { background: var(--c-accent-dim); }

.related-title { font-size: 15px; font-weight: 600; line-height: 1.4; }
.related-desc { font-size: 13px; color: var(--c-ink-dim); }

/* ===== about/privacy 链接列表 ===== */
.about-links-list, .privacy-links-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-top: 16px;
}
.about-links-list li a, .privacy-links-list li a {
  display: block;
  padding: 10px 14px;
  border-radius: 10px;
  color: var(--c-ink-dim);
  font-size: 15px;
  min-height: 40px;
  display: flex;
  align-items: center;
  transition: background 0.2s, color 0.2s;
}
.about-links-list li a:hover, .privacy-links-list li a:hover {
  background: var(--c-accent-dim);
  color: var(--c-accent);
}

/* ===== Breadcrumb ===== */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--c-ink-dim);
  flex-wrap: wrap;
}
.breadcrumb a { color: var(--c-ink-dim); }
.breadcrumb a:hover { color: var(--c-accent); }
.breadcrumb span[aria-current] { color: var(--c-ink); }

/* ===== Privacy date ===== */
.privacy-date {
  font-size: 14px;
  color: var(--c-ink-dim);
}
.privacy-date time { color: var(--c-accent); }

.privacy-prose { font-size: 16px; }

/* ===== 页脚 ===== */
.site-footer {
  background: #0d0d1f;
  border-top: 1px solid var(--c-ink-faint);
  padding: 56px 24px 24px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  max-width: 100%;
  position: relative;
  margin-bottom: var(--nav-h);
}

.footer-col h3 {
  font-family: var(--font-serif);
  font-size: 15px;
  font-weight: 700;
  color: var(--c-ink);
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--c-ink-faint);
}

.footer-col p {
  font-size: 13px;
  color: var(--c-ink-dim);
  line-height: 1.7;
}

.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-col ul li a {
  color: var(--c-ink-dim);
  font-size: 13px;
  transition: color 0.2s;
  min-height: 28px;
  display: flex;
  align-items: center;
}
.footer-col ul li a:hover { color: var(--c-accent); }

.footer-note {
  margin-top: 12px;
  font-size: 12px;
  color: rgba(245,245,240,0.35);
}

.footer-bottom {
  grid-column: 1 / -1;
  padding-top: 20px;
  border-top: 1px solid var(--c-ink-faint);
  text-align: center;
}

.footer-bottom p {
  font-size: 12px;
  color: rgba(245,245,240,0.35);
}

/* ===== 动画 ===== */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(32px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes typingCursor {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0; }
}

.reveal-text {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.7s var(--ease-out), transform 0.7s var(--ease-out);
}
.reveal-text.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.kinetic-h2 {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s var(--ease-out), transform 0.6s var(--ease-out);
}
.kinetic-h2.is-visible { opacity: 1; transform: translateY(0); }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .reveal-text, .kinetic-h2 { opacity: 1; transform: none; }
}

/* ===== 响应式断点 ===== */
@media (max-width: 960px) {
  .page-content-wrap {
    grid-template-columns: 200px 1fr;
    gap: 24px;
  }
  .site-footer {
    grid-template-columns: 1fr 1fr;
  }
  .footer-bottom { grid-column: 1 / -1; }
  .recent-dl { grid-template-columns: 1fr; }
}

@media (max-width: 700px) {
  body { font-size: 16px; }

  .page-content-wrap {
    grid-template-columns: 1fr;
  }

  .sidebar-left {
    position: static;
  }

  .aside-inner {
    padding: 16px;
  }

  .hero-body { padding: 32px 20px; gap: 16px; }
  .hero-actions { flex-direction: column; gap: 10px; }
  .btn-primary, .btn-ghost { justify-content: center; width: 100%; max-width: 280px; }

  .topics-grid { grid-template-columns: 1fr; gap: 16px; }

  .site-footer {
    grid-template-columns: 1fr 1fr;
    padding: 40px 16px 16px;
    gap: 24px;
  }

  .nav-links-flat { display: none; }

  .nav-brand-fixed .brand-text { display: none; }

  .article-header-section,
  .topic-hero, .about-hero, .privacy-hero {
    padding: 72px 16px 32px;
  }

  .content-section { padding: 32px 16px; }

  .prose { padding: 20px 16px; font-size: 16px; }

  .card-inner { padding: 20px; }

  .recent-dl { grid-template-columns: 1fr; }

  .recent-dl dt, .recent-dl dd { padding-left: 16px; padding-right: 16px; }
}

@media (max-width: 480px) {
  .site-footer { grid-template-columns: 1fr; }
  .footer-bottom { grid-column: 1 / -1; }
  .kinetic-h1 { font-size: 1.8rem; }
  .nav-bar-fixed { padding: 0 10px; }
  .nav-cta { padding: 0 10px; font-size: 12px; }
}