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

/* ===== 基础变量 ===== */
:root {
  --c-bg: #000000;
  --c-fg: #ffffff;
  --c-mid: #111111;
  --c-dim: #1a1a1a;
  --c-border: #2a2a2a;
  --c-mute: #888888;
  --c-accent: #ffffff;
  --c-accent-dim: #cccccc;
  --font: 'Noto Sans KR', 'Helvetica Neue', Helvetica, Arial, sans-serif;
  --base: 8px;
  --r: 10px;
  --nav-h: 56px;
  --max-w: 1200px;
  --col-gap: 1rem;
  --transition: 0.2s ease;
}

/* ===== 重置 ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }
body {
  background: var(--c-bg);
  color: var(--c-fg);
  font-family: var(--font);
  font-weight: 400;
  line-height: 1.6;
  min-height: 100vh;
  padding-bottom: var(--nav-h);
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--c-fg); text-decoration: none; }
a:hover { color: var(--c-accent-dim); }
ul, ol { list-style: none; }
address { font-style: normal; }
hr {
  border: none;
  border-top: 1px solid var(--c-border);
  margin: calc(var(--base) * 2) 0 calc(var(--base) * 3);
}

/* ===== 布局容器 ===== */
.site-wrapper { display: flex; flex-direction: column; min-height: 100vh; }

.wrap {
  width: 100%;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 calc(var(--base) * 2);
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--col-gap);
}

/* ===== 底部固定导航 ===== */
.site-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: var(--c-bg);
  border-top: 1px solid var(--c-border);
  height: var(--nav-h);
}

.nav-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 calc(var(--base) * 2);
  gap: var(--base);
  position: relative;
}

.nav-inner ol {
  display: flex;
  align-items: center;
  gap: calc(var(--base) * 0.5);
  flex: 1;
  overflow: hidden;
  flex-wrap: nowrap;
}

.nav-inner ol li a {
  display: block;
  padding: calc(var(--base) * 0.75) var(--base);
  font-size: 13px;
  font-weight: 500;
  white-space: nowrap;
  color: var(--c-mute);
  min-height: 40px;
  line-height: 40px;
  padding-top: 0;
  padding-bottom: 0;
  transition: color var(--transition);
}

.nav-inner ol li a:hover { color: var(--c-fg); }

.nav-brand {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--c-fg);
  white-space: nowrap;
  padding: calc(var(--base) * 0.5) var(--base);
  min-height: 40px;
  display: flex;
  align-items: center;
}

/* ===== 英雄区（首页） ===== */
.hero-section {
  grid-column: 1 / -1;
  min-height: 70vh;
  position: relative;
  display: flex;
  align-items: center;
  overflow: hidden;
  border-bottom: 1px solid var(--c-border);
  margin-bottom: calc(var(--base) * 4);
}

.hero-article {
  width: 100%;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: calc(var(--base) * 3);
  align-items: center;
  padding: calc(var(--base) * 8) 0;
  position: relative;
}

.hero-media {
  position: relative;
  height: 480px;
}

.hero-img {
  position: absolute;
  object-fit: cover;
  border-radius: var(--r);
}

.hero-img-1 {
  width: 72%;
  height: 80%;
  top: 0;
  left: 0;
  z-index: 1;
}

.hero-img-2 {
  width: 56%;
  height: 64%;
  bottom: 0;
  right: 0;
  z-index: 2;
  border: 2px solid var(--c-border);
}

.hero-badge {
  position: absolute;
  top: calc(var(--base) * 2);
  right: 0;
  background: var(--c-fg);
  color: var(--c-bg);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.1em;
  padding: calc(var(--base) * 0.75) calc(var(--base) * 1.5);
  z-index: 3;
  border-radius: 4px;
}

.hero-text {
  display: flex;
  flex-direction: column;
  gap: calc(var(--base) * 2);
  text-align: center;
  align-items: center;
}

.hero-text h1 {
  font-size: clamp(2rem, 4vw, 3.5rem);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.hero-lead {
  font-size: 1.1rem;
  color: var(--c-mute);
  line-height: 1.6;
  max-width: 400px;
}

.cta-btn {
  display: inline-block;
  background: var(--c-fg);
  color: var(--c-bg);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.05em;
  padding: calc(var(--base) * 1.5) calc(var(--base) * 3);
  border-radius: var(--r);
  min-height: 48px;
  line-height: 32px;
  transition: opacity var(--transition);
}

.cta-btn:hover { opacity: 0.85; color: var(--c-bg); }

/* ===== 主内容区（内容+侧边栏） ===== */
.content-section {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: calc(var(--base) * 4);
  margin-bottom: calc(var(--base) * 6);
  align-items: start;
}

.content-body {
  min-width: 0;
}

/* ===== 侧边栏 ===== */
.sidebar {
  position: sticky;
  top: calc(var(--base) * 3);
}

.sidebar-inner {
  background: var(--c-dim);
  border-radius: var(--r);
  padding: calc(var(--base) * 3);
}

.sidebar-inner h2 {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--c-mute);
  margin-bottom: var(--base);
}

.sidebar-list li a {
  display: block;
  padding: calc(var(--base) * 0.75) 0;
  font-size: 14px;
  color: var(--c-accent-dim);
  border-bottom: 1px solid var(--c-border);
  transition: color var(--transition);
  min-height: 40px;
  line-height: 24px;
}

.sidebar-list li:last-child a { border-bottom: none; }
.sidebar-list li a:hover { color: var(--c-fg); }

/* ===== 正文内容 ===== */
.page-content {
  font-size: 16px;
  line-height: 1.75;
  color: var(--c-accent-dim);
  margin-bottom: calc(var(--base) * 4);
}

.page-content h2,
.page-content h3 {
  color: var(--c-fg);
  font-weight: 700;
  margin: calc(var(--base) * 4) 0 calc(var(--base) * 2);
  line-height: 1.3;
}

.page-content h2 { font-size: 1.5rem; }
.page-content h3 { font-size: 1.2rem; }

.page-content p {
  margin-bottom: calc(var(--base) * 2);
}

.page-content a {
  color: var(--c-fg);
  border-bottom: 1px solid var(--c-border);
  transition: border-color var(--transition);
}

.page-content a:hover { border-color: var(--c-fg); }

.page-content ul, .page-content ol {
  list-style: disc;
  padding-left: calc(var(--base) * 3);
  margin-bottom: calc(var(--base) * 2);
}

.page-content ol { list-style: decimal; }

/* ===== 分类区块 ===== */
.cat-section,
.children-section,
.entries-block,
.entry-footer-section,
.about-links-block {
  grid-column: 1 / -1;
  margin-bottom: calc(var(--base) * 6);
}

.cat-section h2,
.children-section h2,
.entries-block h2,
.about-links-block h2 {
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  margin-bottom: var(--base);
}

.entry-footer-section { grid-column: 1 / -1; }
.entry-nav-article h2 {
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  margin-bottom: var(--base);
}

/* ===== 网格 ===== */
.cat-grid,
.children-grid,
.entries-grid,
.continue-grid,
.about-links-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: calc(var(--base) * 2);
  margin-top: calc(var(--base) * 2);
}

/* ===== 卡片 ===== */
.cat-block,
.child-card,
.entry-card,
.continue-card,
.about-link-card {
  display: flex;
  flex-direction: column;
  gap: var(--base);
  background: var(--c-dim);
  border-radius: var(--r);
  padding: calc(var(--base) * 2.5);
  color: var(--c-fg);
  transition: background var(--transition), transform var(--transition);
}

.cat-block:hover,
.child-card:hover,
.entry-card:hover,
.continue-card:hover,
.about-link-card:hover {
  background: var(--c-mid);
  transform: translateY(-2px);
}

.cat-block strong,
.child-card strong,
.entry-card strong,
.continue-card strong,
.about-link-card strong {
  font-size: 15px;
  font-weight: 700;
  line-height: 1.3;
  display: block;
}

.cat-block span,
.child-card .card-desc,
.entry-card .card-desc,
.continue-card span,
.about-link-card span {
  font-size: 13px;
  color: var(--c-mute);
  line-height: 1.5;
}

.card-date {
  font-size: 12px;
  color: var(--c-mute);
}

.card-img {
  border-radius: calc(var(--r) - 2px);
  width: 100%;
  height: 140px;
  object-fit: cover;
}

/* ===== 页面头部（分类/标签/文章） ===== */
.cat-hero-section,
.tag-hero-section,
.about-header-section,
.privacy-header-section,
.entry-header-section {
  grid-column: 1 / -1;
  padding: calc(var(--base) * 6) 0 calc(var(--base) * 4);
  border-bottom: 1px solid var(--c-border);
  margin-bottom: calc(var(--base) * 5);
}

.cat-hero-article,
.tag-hero-article,
.about-header-article,
.privacy-header-article,
.entry-header-article {
  max-width: 760px;
}

.cat-eyebrow {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: var(--c-mute);
  text-transform: uppercase;
  margin-bottom: calc(var(--base) * 1.5);
}

.cat-hero-article h1,
.tag-hero-article h1,
.about-header-article h1,
.privacy-header-article h1,
.entry-header-article h1 {
  font-size: clamp(1.8rem, 3.5vw, 2.8rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin-bottom: calc(var(--base) * 1.5);
}

.cat-lead {
  font-size: 1rem;
  color: var(--c-mute);
  line-height: 1.6;
  max-width: 560px;
}

.page-date {
  display: block;
  font-size: 13px;
  color: var(--c-mute);
  margin-top: var(--base);
}

/* ===== 面包屑 ===== */
.breadcrumb {
  font-size: 13px;
  color: var(--c-mute);
  margin-bottom: calc(var(--base) * 2);
  display: flex;
  align-items: center;
  gap: var(--base);
}

.breadcrumb a { color: var(--c-mute); }
.breadcrumb a:hover { color: var(--c-fg); }

/* ===== 文章元信息 ===== */
.entry-meta {
  display: flex;
  gap: calc(var(--base) * 2);
  flex-wrap: wrap;
  margin-bottom: calc(var(--base) * 2);
}

.meta-date {
  font-size: 13px;
  color: var(--c-mute);
}

.entry-hero-wrap {
  margin: calc(var(--base) * 3) 0;
  border-radius: var(--r);
  overflow: hidden;
}

.entry-hero-img {
  width: 100%;
  max-height: 400px;
  object-fit: cover;
}

/* ===== 页脚 ===== */
.site-footer {
  background: var(--c-mid);
  border-top: 1px solid var(--c-border);
  margin-top: auto;
}

.footer-top {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: calc(var(--base) * 8) calc(var(--base) * 2) calc(var(--base) * 4);
}

.footer-brand-block {
  margin-bottom: calc(var(--base) * 6);
  border-bottom: 1px solid var(--c-border);
  padding-bottom: calc(var(--base) * 4);
}

.footer-brand-large {
  font-size: clamp(2rem, 5vw, 4rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1;
  color: var(--c-fg);
}

.footer-cols {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: calc(var(--base) * 4);
}

.footer-col h3 {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.15em;
  color: var(--c-mute);
  text-transform: uppercase;
  margin-bottom: calc(var(--base) * 2);
}

.footer-col ul li a,
.footer-col address p {
  display: block;
  font-size: 14px;
  color: var(--c-accent-dim);
  padding: calc(var(--base) * 0.5) 0;
  transition: color var(--transition);
  min-height: 40px;
  line-height: 24px;
}

.footer-col ul li a:hover { color: var(--c-fg); }

.footer-bottom {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: calc(var(--base) * 3) calc(var(--base) * 2);
  border-top: 1px solid var(--c-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--base);
}

.footer-bottom span {
  font-size: 13px;
  color: var(--c-mute);
}

.footer-bottom ul {
  display: flex;
  gap: calc(var(--base) * 2);
}

.footer-bottom ul li a {
  font-size: 13px;
  color: var(--c-mute);
  min-height: 40px;
  display: flex;
  align-items: center;
}

.footer-bottom ul li a:hover { color: var(--c-fg); }

/* ===== Scroll Reveal 动效 ===== */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.reveal.visible {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .cta-btn,
  .cat-block,
  .child-card,
  .entry-card,
  .continue-card,
  .about-link-card { transition: none; }
}

/* ===== 移动端 ===== */
@media (max-width: 768px) {
  :root { --col-gap: 0.5rem; }

  .wrap {
    grid-template-columns: 1fr;
    padding: 0 var(--base);
  }

  .hero-article {
    grid-template-columns: 1fr;
    gap: calc(var(--base) * 3);
    padding: calc(var(--base) * 4) 0;
  }

  .hero-media { height: 280px; }
  .hero-img-1 { width: 68%; height: 75%; }
  .hero-img-2 { width: 52%; height: 60%; }

  .hero-text h1 { font-size: 1.8rem; }

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

  .sidebar { position: static; }

  .footer-cols { grid-template-columns: 1fr 1fr; gap: calc(var(--base) * 3); }

  .footer-bottom { flex-direction: column; text-align: center; gap: var(--base); }

  .nav-inner ol {
    gap: 0;
  }

  .nav-inner ol li a {
    font-size: 11px;
    padding: 0 calc(var(--base) * 0.5);
  }

  .nav-brand { font-size: 10px; }

  .cat-grid,
  .children-grid,
  .entries-grid,
  .continue-grid,
  .about-links-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 480px) {
  .cat-grid,
  .children-grid,
  .entries-grid,
  .continue-grid,
  .about-links-grid {
    grid-template-columns: 1fr;
  }

  .footer-cols { grid-template-columns: 1fr; }

  .nav-inner ol li:nth-child(n+5) { display: none; }
}

/* ===== 首页特殊 ===== */
.page-home .hero-section { margin-top: 0; }

/* ===== 关于页关键词高亮 ===== */
.page-about .content-body strong,
.page-privacy .content-body strong {
  color: var(--c-fg);
}