@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;500&family=Orbitron:wght@700;900&display=swap');

/* ===== 变量 ===== */
:root {
  --paper: #fdfbf7;
  --paper-2: #f5f5f5;
  --ink: #1a1a1a;
  --ink-mid: #444444;
  --ink-light: #888888;
  --border: #d0cec9;
  --border-strong: #1a1a1a;
  --accent: #1a1a1a;
  --accent-line: 3px solid #1a1a1a;
  --font-head: 'Orbitron', 'Courier New', monospace;
  --font-body: 'JetBrains Mono', 'Courier New', Courier, monospace;
  --nav-h: 60px;
  --content-max: 720px;
  --wrap-max: 1140px;
  --gap: 1.5rem;
}

/* ===== 重置 ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: auto; }
body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.75;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--ink); text-decoration: underline; text-underline-offset: 3px; }
a:hover { text-decoration: none; }
img { display: block; max-width: 100%; height: auto; }
ul, ol { list-style: none; }
button { cursor: pointer; font-family: inherit; }

/* ===== 纸质纹理叠层 ===== */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='300' height='300'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.75' numOctaves='4' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='300' height='300' filter='url(%23n)' opacity='0.04'/%3E%3C/svg%3E");
  pointer-events: none;
  z-index: 9999;
  mix-blend-mode: multiply;
}

/* ===== 导航 ===== */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--paper);
  border-bottom: 2px solid var(--ink);
  height: var(--nav-h);
  display: flex;
  align-items: center;
}

.nav-inner {
  width: 100%;
  max-width: var(--wrap-max);
  margin: 0 auto;
  padding: 0 1.25rem;
}

.nav-details {
  display: flex;
  align-items: center;
  position: relative;
}

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

summary.nav-brand {
  list-style: none;
  cursor: pointer;
  flex: 0 0 auto;
  padding: 0.5rem 0;
  min-height: 40px;
  display: flex;
  align-items: center;
}
summary.nav-brand::-webkit-details-marker { display: none; }

.brand-name,
.brand-link {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  text-decoration: none;
  color: var(--ink);
  text-transform: uppercase;
  white-space: nowrap;
}

.nav-menu {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  margin: 0;
  padding: 0;
  align-items: center;
  flex: 1;
  justify-content: center;
}

.nav-menu li { display: flex; }

.nav-menu li a {
  font-family: var(--font-body);
  font-size: 0.78rem;
  text-decoration: none;
  color: var(--ink);
  padding: 0 0.75rem;
  height: 40px;
  display: flex;
  align-items: center;
  border-bottom: 2px solid transparent;
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.nav-menu li a:hover,
.nav-menu li.current a {
  border-bottom-color: var(--ink);
}

/* 移动端 nav 展开 */
@media (max-width: 768px) {
  .nav-details { flex-wrap: wrap; }
  .nav-menu {
    display: none;
    position: absolute;
    top: var(--nav-h);
    left: 0;
    right: 0;
    background: var(--paper);
    border: 2px solid var(--ink);
    border-top: none;
    flex-direction: column;
    align-items: stretch;
    z-index: 200;
    padding: 0.5rem 0;
  }
  .nav-details[open] .nav-menu { display: flex; }
  .nav-menu li a {
    padding: 0 1.25rem;
    height: 44px;
    border-bottom: 1px solid var(--border);
  }
  .nav-menu li:last-child a { border-bottom: none; }
  .nav-inner { position: relative; }
}

/* ===== 锚点条 ===== */
.faq-anchor-bar {
  background: var(--paper-2);
  border-bottom: 1px solid var(--border);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.anchor-nav {
  display: flex;
  gap: 0;
  max-width: var(--wrap-max);
  margin: 0 auto;
  padding: 0 1.25rem;
}

.anchor-nav a {
  font-size: 0.72rem;
  text-decoration: none;
  padding: 0 0.875rem;
  height: 36px;
  display: flex;
  align-items: center;
  border-bottom: 2px solid transparent;
  white-space: nowrap;
  color: var(--ink-mid);
  letter-spacing: 0.01em;
}

.anchor-nav a:hover,
.anchor-nav a.anchor-active {
  color: var(--ink);
  border-bottom-color: var(--ink);
}

/* ===== Hero (home) ===== */
.hero-section {
  display: grid;
  grid-template-columns: 1fr 1fr;
  min-height: 100vh;
  border-bottom: 2px solid var(--ink);
}

.hero-media {
  border-right: 2px solid var(--ink);
  overflow: hidden;
  background: var(--paper-2);
  display: flex;
  align-items: center;
  justify-content: center;
}

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

.hero-placeholder {
  width: 100%;
  height: 100%;
  background: repeating-linear-gradient(
    45deg,
    var(--paper) 0,
    var(--paper) 10px,
    var(--paper-2) 10px,
    var(--paper-2) 20px
  );
}

.hero-copy {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: flex-end;
  padding: 3rem 2.5rem;
  text-align: right;
}

.hero-badge {
  display: inline-block;
  font-family: var(--font-body);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  border: 1px solid var(--ink);
  padding: 0.25rem 0.75rem;
  margin-bottom: 1.25rem;
  text-transform: uppercase;
  font-weight: 500;
}

.hero-copy h1 {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(1.4rem, 3vw, 2.2rem);
  line-height: 1.2;
  letter-spacing: 0.04em;
  margin-bottom: 1rem;
  text-transform: uppercase;
}

.hero-lead {
  font-size: 0.95rem;
  color: var(--ink-mid);
  margin-bottom: 1.75rem;
  max-width: 38ch;
}

.hero-cta {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 1.5rem;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 0.85rem;
  letter-spacing: 0.06em;
  text-decoration: none;
  font-weight: 500;
  border: 2px solid var(--ink);
  text-transform: uppercase;
}

.hero-cta:hover {
  background: var(--paper);
  color: var(--ink);
}

@media (max-width: 768px) {
  .hero-section {
    grid-template-columns: 1fr;
    min-height: auto;
  }
  .hero-media {
    border-right: none;
    border-bottom: 2px solid var(--ink);
    height: 220px;
  }
  .hero-copy {
    align-items: flex-start;
    text-align: left;
    padding: 2rem 1.25rem;
  }
  .hero-lead { max-width: 100%; }
}

/* ===== 布局容器 ===== */
.content-wrapper {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 0;
  max-width: var(--wrap-max);
  margin: 0 auto;
  align-items: start;
}

@media (max-width: 960px) {
  .content-wrapper {
    grid-template-columns: 1fr;
  }
}

/* ===== 正文 wrap/section/div 四层 ===== */
.faq-main,
.article-main,
.about-main,
.privacy-main {
  min-width: 0;
  border-right: 1px solid var(--border);
  padding: 2.5rem 0;
}

.wrap {
  max-width: 100%;
  padding: 0 2rem;
}

.content-section { width: 100%; }

div.prose { width: 100%; }

.article-header {
  margin-bottom: 2rem;
  padding-bottom: 1.5rem;
  border-bottom: var(--accent-line);
}

.article-meta {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 0.75rem;
}

.meta-type {
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  border: 1px solid var(--ink);
  padding: 0.15rem 0.5rem;
  font-weight: 500;
}

.meta-date {
  font-size: 0.78rem;
  color: var(--ink-mid);
}

.meta-date time { color: var(--ink-mid); }

div.prose h1 {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(1.3rem, 2.5vw, 1.9rem);
  line-height: 1.2;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-bottom: 0.75rem;
}

.article-lead {
  font-size: 1rem;
  color: var(--ink-mid);
  line-height: 1.6;
}

/* ===== 正文体 ===== */
.article-body {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--ink);
}

.article-body h2 {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin: 2.5rem 0 0.75rem;
  padding-bottom: 0.4rem;
  border-bottom: 2px solid var(--ink);
}

.article-body h3 {
  font-family: var(--font-body);
  font-weight: 500;
  font-size: 1rem;
  letter-spacing: 0.03em;
  margin: 1.75rem 0 0.5rem;
  border-left: 3px solid var(--ink);
  padding-left: 0.75rem;
}

.article-body p { margin-bottom: 1.25rem; }

.article-body ul,
.article-body ol {
  list-style: disc;
  padding-left: 1.5rem;
  margin-bottom: 1.25rem;
}

.article-body ol { list-style: decimal; }

.article-body li { margin-bottom: 0.4rem; }

.article-body blockquote {
  border-left: 3px solid var(--ink);
  padding: 0.75rem 1rem;
  background: var(--paper-2);
  margin: 1.5rem 0;
  color: var(--ink-mid);
}

.article-body a { color: var(--ink); font-weight: 500; }

.article-body strong { font-weight: 500; }

.article-body code {
  font-family: var(--font-body);
  background: var(--paper-2);
  padding: 0.1em 0.35em;
  border: 1px solid var(--border);
  font-size: 0.9em;
}

/* ===== 文章页 hero ===== */
.article-hero {
  max-height: 400px;
  overflow: hidden;
  border-bottom: 2px solid var(--ink);
}

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

/* ===== div footer ===== */
.article-footer {
  margin-top: 2.5rem;
  padding-top: 1.5rem;
  border-top: 2px solid var(--ink);
}

.article-footer h2 {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1rem;
  text-transform: uppercase;
  margin: 0.5rem 0 1rem;
}

.article-related {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.article-related li a {
  font-size: 0.9rem;
  text-decoration: none;
  color: var(--ink);
  display: block;
  padding: 0.4rem 0;
  border-bottom: 1px solid var(--border);
}

.article-related li a:hover { text-decoration: underline; }

/* ===== aside ===== */
.faq-aside,
.article-aside,
.about-aside,
.privacy-aside,
.home-aside {
  padding: 2rem 1.25rem;
  position: sticky;
  top: calc(var(--nav-h) + 8px);
  align-self: start;
}

@media (max-width: 960px) {
  .faq-aside,
  .article-aside,
  .about-aside,
  .privacy-aside,
  .home-aside {
    position: static;
    border-top: 2px solid var(--ink);
    padding: 1.5rem 1.25rem;
  }
}

.aside-block {
  margin-bottom: 2rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border);
}

.aside-block:last-child { border-bottom: none; margin-bottom: 0; }

.aside-block h3 {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin: 0.4rem 0 0.75rem;
}

.aside-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.aside-list li { border-bottom: 1px solid var(--border); }
.aside-list li:last-child { border-bottom: none; }

.aside-list li a {
  display: block;
  font-size: 0.82rem;
  text-decoration: none;
  color: var(--ink);
  padding: 0.45rem 0;
  line-height: 1.4;
}

.aside-list li a:hover { text-decoration: underline; }

.aside-list li small {
  display: block;
  font-size: 0.72rem;
  color: var(--ink-light);
  padding-bottom: 0.4rem;
  line-height: 1.4;
}

.aside-faq-list {
  list-style: none;
  padding: 0;
  counter-reset: faq-counter;
}

.aside-faq-list li {
  counter-increment: faq-counter;
  border-bottom: 1px solid var(--border);
}

.aside-faq-list li:last-child { border-bottom: none; }

.aside-faq-list li.active a { font-weight: 500; border-left: 2px solid var(--ink); padding-left: 0.5rem; }

.aside-faq-list li a {
  display: flex;
  gap: 0.5rem;
  font-size: 0.8rem;
  text-decoration: none;
  color: var(--ink);
  padding: 0.45rem 0;
  line-height: 1.4;
  align-items: flex-start;
}

.aside-faq-list li a:hover { text-decoration: underline; }

.nav-num {
  font-family: var(--font-body);
  font-size: 0.7rem;
  color: var(--ink-light);
  flex-shrink: 0;
  padding-top: 0.1em;
}

/* ===== 首页 grid ===== */
.home-grid {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 0;
  max-width: var(--wrap-max);
  margin: 0 auto;
  align-items: start;
  border-top: 2px solid var(--ink);
}

@media (max-width: 960px) {
  .home-grid {
    grid-template-columns: 1fr;
  }
}

.home-primary {
  padding: 2.5rem 2rem;
  border-right: 1px solid var(--border);
}

/* ===== 首页 main content area ===== */
#main-content .wrap {
  padding: 2.5rem 2rem;
}

.body-home #main-content {
  max-width: var(--wrap-max);
  margin: 0 auto;
  padding: 0;
}

.body-home #main-content .wrap {
  padding: 2rem;
  border-bottom: 2px solid var(--ink);
}

/* ===== block sections ===== */
.block-section {
  margin-bottom: 3rem;
  padding-bottom: 2.5rem;
  border-bottom: 1px solid var(--border);
}

.block-section:last-child { border-bottom: none; }

.block-section h2 {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin: 0.4rem 0 1.25rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--ink);
}

/* ===== eyebrow ===== */
.eyebrow {
  display: block;
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-light);
  font-weight: 500;
  margin-bottom: 0.2rem;
}

/* ===== FAQ 列表 ===== */
.faq-list,
.article-list {
  padding: 0;
  counter-reset: list-counter;
}

.faq-list li,
.article-list li {
  counter-increment: list-counter;
  border-bottom: 1px solid var(--border);
}

.faq-list li:last-child,
.article-list li:last-child { border-bottom: none; }

.faq-list li a,
.article-list li a {
  display: flex;
  gap: 0.75rem;
  align-items: flex-start;
  padding: 0.75rem 0;
  text-decoration: none;
  color: var(--ink);
}

.faq-list li a::before,
.article-list li a::before {
  content: counter(list-counter, decimal-leading-zero);
  font-family: var(--font-body);
  font-size: 0.72rem;
  color: var(--ink-light);
  flex-shrink: 0;
  padding-top: 0.1em;
  min-width: 1.6em;
}

.faq-list li a:hover,
.article-list li a:hover { text-decoration: underline; }

.faq-list li a small,
.article-list li a small {
  display: block;
  font-size: 0.75rem;
  color: var(--ink-light);
  font-weight: 400;
  margin-top: 0.15rem;
}

/* ===== 卡片列表（首页/栏目页子页） ===== */
.card-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.25rem;
}

.card-list li a {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  padding: 1rem 1rem 0.875rem;
  border: 1px solid var(--border);
  border-bottom: var(--accent-line);
  text-decoration: none;
  color: var(--ink);
  background: var(--paper);
}

.card-list li a:hover { background: var(--paper-2); }

.card-title {
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 500;
  line-height: 1.4;
}

.card-desc {
  font-size: 0.78rem;
  color: var(--ink-mid);
  line-height: 1.5;
}

.card-date {
  font-size: 0.72rem;
  color: var(--ink-light);
}

/* ===== 页脚 ===== */
.site-footer {
  background: var(--paper-2);
  border-top: 2px solid var(--ink);
  padding: 0;
}

.footer-form-block {
  max-width: var(--wrap-max);
  margin: 0 auto;
  padding: 1.75rem 2rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  gap: 1.5rem;
  align-items: baseline;
  flex-wrap: wrap;
}

.footer-form-label {
  font-family: var(--font-head);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  flex-shrink: 0;
}

.footer-contact-note {
  font-size: 0.82rem;
  color: var(--ink-mid);
}

.footer-cols {
  max-width: var(--wrap-max);
  margin: 0 auto;
  padding: 2rem;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  border-bottom: 1px solid var(--border);
}

@media (max-width: 680px) {
  .footer-cols { grid-template-columns: 1fr; gap: 1.5rem; }
}

.footer-col dt {
  font-family: var(--font-head);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 0.75rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--ink);
}

.footer-col dd {
  margin: 0;
  border-bottom: 1px solid var(--border);
}

.footer-col dd:last-child { border-bottom: none; }

.footer-col dd a {
  display: block;
  font-size: 0.8rem;
  text-decoration: none;
  color: var(--ink-mid);
  padding: 0.35rem 0;
}

.footer-col dd a:hover { color: var(--ink); text-decoration: underline; }

.footer-bottom {
  max-width: var(--wrap-max);
  margin: 0 auto;
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.footer-copy {
  font-size: 0.75rem;
  color: var(--ink-light);
  letter-spacing: 0.04em;
}

.footer-links {
  display: flex;
  gap: 1.25rem;
}

.footer-links a {
  font-size: 0.75rem;
  text-decoration: none;
  color: var(--ink-mid);
  min-height: 40px;
  display: inline-flex;
  align-items: center;
}

.footer-links a:hover { color: var(--ink); text-decoration: underline; }

/* ===== aside 导航 ===== */
.aside-nav {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.aside-nav li { border-bottom: 1px solid var(--border); }
.aside-nav li:last-child { border-bottom: none; }

.aside-nav li a {
  display: block;
  font-size: 0.82rem;
  text-decoration: none;
  color: var(--ink);
  padding: 0.45rem 0;
  line-height: 1.4;
}

.aside-nav li a:hover { text-decoration: underline; }

/* ===== 响应式正文 ===== */
@media (max-width: 960px) {
  .faq-main,
  .article-main,
  .about-main,
  .privacy-main {
    border-right: none;
    padding: 1.5rem 0;
  }
  .wrap { padding: 0 1.25rem; }
  .home-primary { padding: 1.5rem 1.25rem; border-right: none; }
}

@media (max-width: 480px) {
  div.prose h1 { font-size: 1.2rem; }
  .block-section h2 { font-size: 0.95rem; }
  .card-list { grid-template-columns: 1fr; }
  .footer-form-block { padding: 1.25rem; }
  .footer-bottom { padding: 0.875rem 1.25rem; }
  .footer-cols { padding: 1.25rem; }
}

/* ===== 动效：交错列表 ===== */
@media (prefers-reduced-motion: no-preference) {
  .faq-list li,
  .article-list li,
  .card-list li {
    animation: fadeUp 0.35s both;
  }
  .faq-list li:nth-child(1), .article-list li:nth-child(1), .card-list li:nth-child(1) { animation-delay: 0.05s; }
  .faq-list li:nth-child(2), .article-list li:nth-child(2), .card-list li:nth-child(2) { animation-delay: 0.10s; }
  .faq-list li:nth-child(3), .article-list li:nth-child(3), .card-list li:nth-child(3) { animation-delay: 0.15s; }
  .faq-list li:nth-child(4), .article-list li:nth-child(4), .card-list li:nth-child(4) { animation-delay: 0.20s; }
  .faq-list li:nth-child(5), .article-list li:nth-child(5), .card-list li:nth-child(5) { animation-delay: 0.25s; }

  @keyframes fadeUp {
    from { opacity: 0; transform: translateY(8px); }
    to   { opacity: 1; transform: translateY(0); }
  }

  .card-list li a,
  .faq-list li a,
  .article-list li a,
  .aside-list li a {
    transition: background 0.15s, color 0.15s;
  }

  .aside-block h3,
  .block-section h2,
  .article-body h2 {
    transition: letter-spacing 0.15s;
  }
}

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

/* ===== 跳过导航 ===== */
.skip-link {
  position: absolute;
  top: -9999px;
  left: 0;
  background: var(--ink);
  color: var(--paper);
  padding: 0.5rem 1rem;
  font-size: 0.85rem;
  z-index: 9999;
}
.skip-link:focus { top: 0; }