/* ===== 字体 ===== */
@import url('https://fonts.googleapis.com/css2?family=Chakra+Petch:wght@300;400;500;600;700&family=Russo+One&display=swap');

/* ===== 变量 ===== */
:root {
  --blue: #3bb1ff;
  --red: #ff5252;
  --black: #000;
  --white: #fff;
  --bg: #f4f4f0;
  --border: 3px solid #000;
  --shadow: 5px 5px 0 #000;
  --shadow-sm: 3px 3px 0 #000;
  --radius: 18px;
  --font-head: 'Russo One', 'Chakra Petch', Impact, sans-serif;
  --font-body: 'Chakra Petch', system-ui, sans-serif;
  --max-w: 1200px;
  --aside-w: 280px;
}

/* ===== 重置 ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--black);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
img { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }

/* ===== 布局包裹 ===== */
.nb-wrap { min-height: 100vh; display: flex; flex-direction: column; }

/* ===== 顶部条（内页用） ===== */
.topbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--black);
  border-bottom: var(--border);
  display: flex;
  align-items: center;
  gap: 0;
  padding: 0 20px;
  height: 52px;
}
.topbar__brand {
  font-family: var(--font-head);
  font-size: 1rem;
  color: var(--blue);
  letter-spacing: .05em;
  margin-right: auto;
  padding: 8px 0;
  min-height: 40px;
  display: flex;
  align-items: center;
}
.topbar__link {
  color: var(--white);
  font-weight: 600;
  font-size: .9rem;
  padding: 8px 16px;
  min-height: 40px;
  display: flex;
  align-items: center;
  border-left: 2px solid #222;
  transition: background .15s, color .15s;
}
.topbar__link:hover,
.topbar__link--active { background: var(--blue); color: var(--black); }

/* ===== 主区域 ===== */
.site-main {
  flex: 1;
  display: flex;
  gap: 32px;
  max-width: var(--max-w);
  margin: 40px auto;
  padding: 0 20px;
  width: 100%;
  align-items: flex-start;
}
.site-main--narrow { max-width: 900px; }

/* ===== article 包裹 ===== */
.art-wrap {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 48px;
}
.art-wrap--full { width: 100%; }

/* ===== HERO ===== */
.hero {
  min-height: 100vh;
  background: var(--black);
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
  border-bottom: var(--border);
}
.hero__media {
  position: absolute;
  inset: 0;
  z-index: 0;
}
.hero__img-stack {
  position: relative;
  width: 100%;
  height: 100%;
}
.hero-img {
  position: absolute;
  object-fit: cover;
  border: var(--border);
}
.hero-img--1 {
  top: 10%;
  right: 2%;
  width: 42%;
  height: 55%;
  transform: rotate(-2deg);
  box-shadow: 8px 8px 0 var(--red);
  z-index: 1;
}
.hero-img--2 {
  top: 30%;
  right: 22%;
  width: 36%;
  height: 48%;
  transform: rotate(2.5deg);
  box-shadow: 8px 8px 0 var(--blue);
  z-index: 2;
}
.hero__badge {
  position: absolute;
  font-family: var(--font-head);
  font-size: .8rem;
  letter-spacing: .1em;
  padding: 6px 14px;
  border: 3px solid var(--black);
  z-index: 10;
  font-weight: 700;
  text-transform: uppercase;
}
.hero__badge--1 {
  background: var(--blue);
  color: var(--black);
  top: 12%;
  right: 42%;
  transform: rotate(-3deg);
  box-shadow: 3px 3px 0 var(--black);
}
.hero__badge--2 {
  background: var(--red);
  color: var(--white);
  top: 55%;
  right: 6%;
  transform: rotate(2deg);
  box-shadow: 3px 3px 0 var(--black);
}
.hero__copy {
  position: relative;
  z-index: 10;
  padding: 80px 48px 60px;
  max-width: 560px;
  display: flex;
  flex-direction: column;
  gap: 20px;
  justify-content: center;
  min-height: 100vh;
}
.hero__eyebrow {
  font-family: var(--font-head);
  font-size: .75rem;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--blue);
  border: 2px solid var(--blue);
  display: inline-block;
  padding: 4px 12px;
  width: fit-content;
}
.hero__h1 {
  font-family: var(--font-head);
  font-size: clamp(2rem, 5vw, 3.6rem);
  line-height: 1.1;
  color: var(--white);
  text-shadow: 4px 4px 0 var(--red);
}
.hero__sub {
  font-size: 1.05rem;
  color: #ccc;
  max-width: 440px;
  line-height: 1.7;
}
.hero__cta-row {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-top: 8px;
}

/* ===== 按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-head);
  font-size: .95rem;
  font-weight: 700;
  letter-spacing: .05em;
  padding: 12px 24px;
  min-height: 44px;
  border: 3px solid var(--black);
  cursor: pointer;
  transition: transform .1s, box-shadow .1s;
  border-radius: 6px;
  white-space: nowrap;
}
.btn--primary {
  background: var(--blue);
  color: var(--black);
  box-shadow: var(--shadow);
}
.btn--primary:hover {
  transform: translate(-2px, -2px);
  box-shadow: 7px 7px 0 var(--black);
}
.btn--outline {
  background: transparent;
  color: var(--white);
  border-color: var(--white);
  box-shadow: 5px 5px 0 rgba(255,255,255,.3);
}
.btn--outline:hover {
  background: var(--white);
  color: var(--black);
  box-shadow: 7px 7px 0 rgba(255,255,255,.5);
}
.btn--sm {
  font-size: .82rem;
  padding: 8px 16px;
  min-height: 40px;
  background: var(--red);
  color: var(--white);
  box-shadow: var(--shadow-sm);
}
.btn--sm:hover { transform: translate(-2px,-2px); box-shadow: 5px 5px 0 var(--black); }

/* ===== 标题装饰 ===== */
.section-title {
  font-family: var(--font-head);
  font-size: 1.5rem;
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  gap: 12px;
}
.section-title > span {
  border-bottom: 4px solid var(--blue);
  padding-bottom: 2px;
}
.section-title::before {
  content: '';
  display: inline-block;
  width: 14px;
  height: 14px;
  background: var(--red);
  border: 2px solid var(--black);
  transform: rotate(45deg);
  flex-shrink: 0;
}

/* ===== 卡片网格（首页/相关） ===== */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}
.vid-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  border: 3px solid var(--black);
  border-radius: var(--radius);
  background: var(--white);
  padding: 20px;
  box-shadow: var(--shadow);
  transition: transform .15s, box-shadow .15s;
  position: relative;
  overflow: hidden;
}
.vid-card:hover {
  transform: translate(-3px, -3px);
  box-shadow: 8px 8px 0 var(--black);
}
.vid-card__title {
  font-family: var(--font-head);
  font-size: 1rem;
  line-height: 1.3;
  color: var(--black);
}
.vid-card__thumb img {
  width: 100%;
  height: 160px;
  object-fit: cover;
  border: 2px solid var(--black);
  border-radius: 8px;
}
.vid-card__desc {
  font-size: .88rem;
  color: #444;
  line-height: 1.5;
  flex: 1;
}
.vid-card__bar {
  display: block;
  height: 5px;
  background: var(--blue);
  border-radius: 0 0 var(--radius) var(--radius);
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  border-top: 2px solid var(--black);
}
.card-date {
  font-size: .78rem;
  color: #777;
  font-weight: 500;
}

/* ===== aside ===== */
.site-aside {
  width: var(--aside-w);
  flex-shrink: 0;
  position: sticky;
  top: 80px;
}
.aside-inner {
  border: 3px solid var(--black);
  border-radius: var(--radius);
  background: var(--white);
  box-shadow: var(--shadow);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  gap: 0;
}
.aside-title {
  font-family: var(--font-head);
  font-size: 1rem;
  padding: 14px 18px;
  background: var(--black);
  color: var(--white);
  letter-spacing: .05em;
}
.aside-title > span { border-bottom: 2px solid var(--blue); padding-bottom: 1px; }
.aside-nav {
  display: flex;
  flex-direction: column;
  padding: 12px 0;
}
.aside-link {
  display: block;
  padding: 10px 18px;
  font-size: .88rem;
  font-weight: 500;
  border-left: 4px solid transparent;
  transition: background .12s, border-color .12s;
  min-height: 40px;
  display: flex;
  align-items: center;
}
.aside-link:hover { background: var(--bg); border-left-color: var(--blue); }
.aside-link--active { border-left-color: var(--red); background: #fff0f0; font-weight: 700; }
.aside-tips {
  border-top: 3px solid var(--black);
  padding: 16px 18px;
  background: var(--bg);
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.aside-tips__title {
  font-family: var(--font-head);
  font-size: .88rem;
  color: var(--black);
}
.aside-tips__title > span { border-bottom: 2px solid var(--red); }
.aside-tips p { font-size: .82rem; color: #555; line-height: 1.5; }

/* ===== 文章样式 ===== */
.art-header {
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.art-h1 {
  font-family: var(--font-head);
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  line-height: 1.2;
  color: var(--black);
  text-shadow: 3px 3px 0 var(--blue);
}
.art-meta { display: flex; gap: 16px; flex-wrap: wrap; }
.art-date {
  font-size: .82rem;
  color: #666;
  border: 2px solid #ccc;
  border-radius: 6px;
  padding: 3px 10px;
  font-weight: 500;
}
.art-date--mod { border-color: var(--blue); color: var(--blue); }
.art-hero-media {
  border: 3px solid var(--black);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: var(--shadow);
}
.art-hero-img { width: 100%; height: auto; display: block; }

/* ===== 正文 prose ===== */
.prose {
  font-size: 1.02rem;
  line-height: 1.8;
  color: #111;
}
.prose h2 {
  font-family: var(--font-head);
  font-size: 1.4rem;
  margin: 2em 0 .6em;
  color: var(--black);
  border-left: 5px solid var(--blue);
  padding-left: 12px;
}
.prose h2 span { border-bottom: 2px solid var(--red); }
.prose h3 {
  font-family: var(--font-head);
  font-size: 1.1rem;
  margin: 1.6em 0 .4em;
  color: var(--black);
}
.prose h3 span { border-bottom: 2px solid var(--blue); }
.prose p { margin-bottom: 1.2em; }
.prose ul, .prose ol { padding-left: 1.4em; margin-bottom: 1.2em; }
.prose ul li { list-style: disc; margin-bottom: .4em; }
.prose ol li { list-style: decimal; margin-bottom: .4em; }
.prose a { color: var(--red); text-decoration: underline; font-weight: 600; }
.prose a:hover { color: var(--blue); }
.prose strong { font-weight: 700; color: var(--black); }
.prose blockquote {
  border-left: 5px solid var(--red);
  padding: 12px 20px;
  background: #fff5f5;
  margin: 1.5em 0;
  border-radius: 0 8px 8px 0;
  font-style: italic;
}
.prose table { width: 100%; border-collapse: collapse; margin: 1.5em 0; }
.prose th, .prose td {
  border: 2px solid var(--black);
  padding: 10px 14px;
  text-align: left;
}
.prose th { background: var(--black); color: var(--white); font-family: var(--font-head); }
.prose tr:nth-child(even) td { background: #f8f8f8; }
.prose code {
  font-family: monospace;
  background: #f0f0f0;
  padding: 2px 6px;
  border: 1px solid #ccc;
  border-radius: 4px;
  font-size: .9em;
}
.prose pre {
  background: #111;
  color: #fff;
  padding: 20px;
  border-radius: 8px;
  overflow-x: auto;
  margin: 1.5em 0;
  border: 3px solid var(--black);
}

/* ===== 首页内容区 ===== */
.home-article {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 56px;
}
.home-article__content { /* prose already applied */ }
.home-article__cards {}

/* ===== 面包屑 ===== */
.breadcrumb {
  font-size: .85rem;
  color: #666;
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}
.breadcrumb a { color: var(--blue); font-weight: 600; }
.breadcrumb a:hover { color: var(--red); }
.bc-sep { color: #aaa; }
.bc-current { color: #333; font-weight: 600; }

/* ===== 相关内容卡片 ===== */
.rel-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 20px;
}
.rel-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  border: 3px solid var(--black);
  border-radius: var(--radius);
  background: var(--white);
  padding: 16px;
  box-shadow: var(--shadow-sm);
  transition: transform .15s, box-shadow .15s;
  position: relative;
  overflow: hidden;
}
.rel-card:hover { transform: translate(-2px,-2px); box-shadow: 5px 5px 0 var(--black); }
.rel-card__title { font-family: var(--font-head); font-size: .9rem; color: var(--black); }
.rel-card__thumb img {
  width: 100%;
  height: 120px;
  object-fit: cover;
  border: 2px solid var(--black);
  border-radius: 6px;
}
.rel-card__desc { font-size: .8rem; color: #555; line-height: 1.4; flex: 1; }
.rel-card__bar {
  display: block;
  height: 4px;
  background: var(--red);
  position: absolute;
  bottom: 0; left: 0; right: 0;
  border-top: 2px solid var(--black);
}

/* ===== About 专有 ===== */
.about-badge {
  font-family: var(--font-head);
  font-size: .75rem;
  letter-spacing: .15em;
  text-transform: uppercase;
  background: var(--blue);
  color: var(--black);
  border: 3px solid var(--black);
  box-shadow: var(--shadow-sm);
  padding: 5px 14px;
  display: inline-block;
  width: fit-content;
}
.about-badge--grey { background: #ddd; }
.about-sub { font-size: 1.1rem; color: #444; max-width: 600px; line-height: 1.7; }
.about-header { padding-bottom: 8px; border-bottom: 3px solid var(--black); }

.about-link-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 20px;
}
.about-link-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  border: 3px solid var(--black);
  border-radius: var(--radius);
  background: var(--white);
  padding: 20px;
  box-shadow: var(--shadow);
  transition: transform .15s, box-shadow .15s;
}
.about-link-card:hover { transform: translate(-3px,-3px); box-shadow: 8px 8px 0 var(--black); }
.about-link-card strong { font-family: var(--font-head); font-size: 1rem; color: var(--black); }
.about-link-card span { font-size: .85rem; color: #555; }

/* ===== Privacy 专有 ===== */
.priv-link-row {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}
.priv-link {
  display: flex;
  flex-direction: column;
  gap: 4px;
  border: 3px solid var(--black);
  border-radius: var(--radius);
  background: var(--white);
  padding: 16px 24px;
  box-shadow: var(--shadow-sm);
  transition: transform .15s, box-shadow .15s;
  min-width: 160px;
}
.priv-link:hover { transform: translate(-2px,-2px); box-shadow: 5px 5px 0 var(--black); }
.priv-link strong { font-family: var(--font-head); font-size: .95rem; color: var(--black); }

/* ===== 页脚 ===== */
.site-footer {
  background: var(--black);
  color: var(--white);
  border-top: 3px solid var(--black);
  margin-top: auto;
}
.footer-cta {
  background: var(--blue);
  color: var(--black);
  border-bottom: 3px solid var(--black);
  padding: 48px 40px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}
.footer-cta__title {
  font-family: var(--font-head);
  font-size: clamp(1.4rem, 3vw, 2rem);
}
.footer-cta__title > span { border-bottom: 4px solid var(--black); }
.footer-cta__sub { font-size: 1rem; color: #1a1a1a; max-width: 500px; }
.footer-body {
  display: grid;
  grid-template-columns: 1fr 2fr 1fr;
  gap: 0;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 40px 40px 24px;
  width: 100%;
}
.footer-col { padding: 0 20px; }
.footer-nav-col { padding: 0 20px; border-left: 1px solid #333; border-right: 1px solid #333; }
.footer-brand { margin-bottom: 12px; }
.footer-logo { width: 40px; height: 40px; object-fit: contain; }
.footer-brand-text {
  font-family: var(--font-head);
  font-size: 1.1rem;
  color: var(--blue);
  letter-spacing: .05em;
}
.footer-about { font-size: .85rem; color: #aaa; line-height: 1.6; max-width: 240px; }
.footer-nav__label {
  font-family: var(--font-head);
  font-size: .75rem;
  letter-spacing: .15em;
  text-transform: uppercase;
  color: var(--blue);
  margin-bottom: 12px;
  display: block;
}
.footer-nav-col dl dd { margin-bottom: 8px; }
.footer-nav-col dl dd a,
.footer-col dl dd a {
  color: #ccc;
  font-size: .88rem;
  transition: color .12s;
  display: block;
  padding: 4px 0;
  min-height: 32px;
  display: flex;
  align-items: center;
}
.footer-nav-col dl dd a:hover,
.footer-col dl dd a:hover { color: var(--blue); }
.footer-col dl dt { font-family: var(--font-head); font-size: .75rem; letter-spacing: .15em; text-transform: uppercase; color: var(--blue); margin-bottom: 12px; }
.footer-bottom {
  border-top: 1px solid #333;
  text-align: center;
  padding: 20px 40px;
  font-size: .82rem;
  color: #666;
}

/* ===== Scroll Reveal ===== */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity .5s ease, transform .5s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== 响应式 ===== */
@media (max-width: 900px) {
  .site-main {
    flex-direction: column;
    gap: 24px;
    margin: 24px auto;
  }
  .site-aside {
    width: 100%;
    position: static;
  }
  .footer-body {
    grid-template-columns: 1fr;
    padding: 32px 24px;
    gap: 24px;
  }
  .footer-nav-col { border: none; border-top: 1px solid #333; border-bottom: 1px solid #333; padding: 20px 0; }
  .footer-col { padding: 0; }
  .hero__copy { padding: 60px 24px 40px; min-height: 60vh; }
  .hero-img--1 { width: 55%; height: 40%; top: 5%; right: 2%; }
  .hero-img--2 { display: none; }
}

@media (max-width: 600px) {
  body { font-size: 16px; }
  .hero { min-height: 100vh; }
  .hero__copy { padding: 40px 20px 30px; min-height: 100vh; gap: 16px; }
  .hero__h1 { font-size: 1.8rem; }
  .hero__cta-row { flex-direction: column; }
  .btn { width: 100%; justify-content: center; }
  .card-grid { grid-template-columns: 1fr; }
  .rel-grid { grid-template-columns: 1fr; }
  .about-link-grid { grid-template-columns: 1fr; }
  .priv-link-row { flex-direction: column; }
  .topbar { padding: 0 12px; }
  .topbar__link { padding: 8px 10px; font-size: .82rem; }
  .footer-cta { padding: 32px 20px; }
  .site-main { padding: 0 16px; }
  .art-h1 { font-size: 1.4rem; }
  .hero-img--1 { width: 70%; }
}

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