/* ==========================================================================
   51漫画下载 · 全站样式表
   结构：base / layout / components / pages / responsive
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. base — 变量、重置、排版基础
   -------------------------------------------------------------------------- */

:root {
  --paper: #f7f5f0;
  --ink: #14141a;
  --grid-gray: #8b8b96;
  --accent: #ff5b2e;
  --accent-cyan: #17b3c9;
  --paper-soft: #e8e5dd;
  --line: #c9c5bb;

  --text-main: #1a1a20;
  --text-sub: #5c5c66;
  --surface: #fffdf9;
  --surface-alt: #efebe3;

  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans CJK SC", sans-serif;
  --font-mono: "SFMono-Regular", "Menlo", "Consolas", "DejaVu Sans Mono", monospace;

  --wrap: 1180px;
  --radius: 6px;
  --radius-sm: 4px;
  --shadow-hard: 3px 3px 0 rgba(20, 20, 26, 0.14);
  --shadow-soft: 0 2px 10px rgba(20, 20, 26, 0.07);
}

html[data-theme="dark"] {
  --paper: #14141a;
  --ink: #eceaf2;
  --grid-gray: #7f7f8c;
  --paper-soft: #1e1e26;
  --line: #33333d;

  --text-main: #eceaf2;
  --text-sub: #a3a3b0;
  --surface: #1b1b23;
  --surface-alt: #22222b;
  --shadow-hard: 3px 3px 0 rgba(0, 0, 0, 0.5);
  --shadow-soft: 0 2px 10px rgba(0, 0, 0, 0.4);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background-color: var(--paper);
  color: var(--text-main);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3,
h4 {
  margin: 0;
  line-height: 1.35;
  font-weight: 900;
  color: var(--text-main);
}

p {
  margin: 0 0 14px;
}

p:last-child {
  margin-bottom: 0;
}

ul,
ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

a {
  color: inherit;
  text-decoration: none;
}

a:hover {
  color: var(--accent-cyan);
}

img {
  display: block;
  max-width: 100%;
  height: auto;
}

figure {
  margin: 0;
}

button {
  font-family: inherit;
  cursor: pointer;
}

table {
  border-collapse: collapse;
  width: 100%;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* --------------------------------------------------------------------------
   2. layout — 页头、主导航、主体、面包屑、页脚
   -------------------------------------------------------------------------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background-color: var(--paper);
  border-bottom: 2px solid var(--ink);
}

.header-inner {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 24px;
  min-height: 68px;
  display: flex;
  align-items: center;
  gap: 18px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.brand-mark {
  width: 26px;
  height: 26px;
  border-radius: var(--radius-sm);
  background-color: var(--accent);
  box-shadow: inset 0 0 0 3px var(--paper);
  position: relative;
}

.brand-mark::after {
  content: "";
  position: absolute;
  inset: 8px 5px;
  background-color: var(--paper);
  border-radius: 1px;
}

.brand-name {
  font-size: 19px;
  font-weight: 900;
  letter-spacing: 0;
  color: var(--text-main);
}

.brand:hover .brand-name {
  color: var(--accent);
}

.site-nav {
  flex: 1 1 auto;
  min-width: 0;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 4px;
  flex-wrap: wrap;
}

.nav-link {
  display: inline-block;
  padding: 8px 11px;
  font-size: 15px;
  font-weight: 700;
  color: var(--text-sub);
  border-bottom: 3px solid transparent;
  white-space: nowrap;
}

.nav-link:hover {
  color: var(--accent);
}

.nav-link.is-current {
  color: var(--text-main);
  border-bottom-color: var(--accent);
}

.theme-toggle {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  border: 2px solid var(--ink);
  border-radius: var(--radius-sm);
  background-color: var(--surface);
  position: relative;
}

.theme-toggle::before {
  content: "";
  position: absolute;
  inset: 9px;
  border-radius: 50%;
  background-color: var(--accent);
  box-shadow: inset -5px -4px 0 0 var(--surface);
}

.theme-toggle:hover {
  border-color: var(--accent);
}

.nav-toggle {
  display: none;
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  border: 2px solid var(--ink);
  border-radius: var(--radius-sm);
  background-color: var(--surface);
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
}

.nav-toggle-bar {
  display: block;
  width: 20px;
  height: 2px;
  background-color: var(--text-main);
}

.site-main {
  display: block;
}

.inner-main {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 24px 56px;
}

.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  padding: 20px 0 6px;
  font-size: 14px;
  color: var(--text-sub);
}

.breadcrumb a {
  color: var(--text-sub);
  border-bottom: 1px solid var(--line);
}

.breadcrumb a:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.breadcrumb-sep {
  color: var(--grid-gray);
}

.breadcrumb-current {
  color: var(--text-main);
  font-weight: 700;
}

.page-header {
  padding: 8px 0 18px;
  border-bottom: 3px solid var(--ink);
  margin-bottom: 32px;
}

.page-title {
  font-size: 34px;
  font-weight: 900;
  line-height: 1.3;
  position: relative;
  padding-bottom: 12px;
}

.page-title::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 64px;
  height: 4px;
  background-color: var(--accent);
}

.page-description {
  margin-top: 14px;
  font-size: 16px;
  color: var(--text-sub);
}

/* 内页两栏：主内容 + 右侧主题目录 */
.page-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 60px;
  align-items: start;
}

.page-main,
.page-content,
.page-body {
  min-width: 0;
}

.page-aside,
.topic-toc {
  position: sticky;
  top: 92px;
  align-self: start;
  min-width: 0;
  border: 2px solid var(--ink);
  border-radius: var(--radius);
  background-color: var(--surface-alt);
  padding: 18px 18px 20px;
}

.aside-title,
.toc-title {
  font-size: 15px;
  font-weight: 900;
  padding-bottom: 10px;
  margin-bottom: 12px;
  border-bottom: 2px solid var(--ink);
}

.aside-nav-list,
.toc-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.aside-nav-list a,
.toc-list a {
  display: block;
  padding: 7px 8px;
  font-size: 14px;
  color: var(--text-sub);
  border-left: 3px solid transparent;
}

.aside-nav-list a:hover,
.toc-list a:hover {
  color: var(--text-main);
  background-color: var(--surface);
  border-left-color: var(--accent);
}

/* 页脚 */
.site-footer {
  margin-top: 56px;
  border-top: 3px solid var(--ink);
  background-color: var(--surface-alt);
}

.footer-inner {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 40px 24px 26px;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 28px;
}

.footer-col-title {
  font-size: 15px;
  font-weight: 900;
  margin-bottom: 12px;
  padding-left: 9px;
  border-left: 3px solid var(--accent);
}

.footer-link-list {
  display: flex;
  flex-direction: column;
  gap: 7px;
}

.footer-link-list a {
  font-size: 14px;
  color: var(--text-sub);
}

.footer-link-list a:hover {
  color: var(--accent);
}

.footer-text {
  font-size: 14px;
  color: var(--text-sub);
  margin: 0;
}

.footer-bottom {
  border-top: 1px solid var(--line);
  padding: 18px 24px 26px;
  max-width: var(--wrap);
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 18px;
}

.footer-brand {
  font-size: 15px;
  font-weight: 900;
  margin: 0;
}

.footer-slogan {
  font-size: 14px;
  color: var(--text-sub);
  margin: 0;
}

.footer-copyright {
  font-size: 13px;
  color: var(--grid-gray);
  margin: 0;
  flex-basis: 100%;
}

/* --------------------------------------------------------------------------
   3. components — 按钮、标签、卡片、列表、表格、折叠问答
   -------------------------------------------------------------------------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 10px 22px;
  font-size: 15px;
  font-weight: 700;
  border-radius: var(--radius-sm);
  border: 2px solid transparent;
  transition: transform 0.18s ease, background-color 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}

.btn-primary {
  background-color: var(--accent);
  color: #ffffff;
  border-color: var(--accent);
  box-shadow: var(--shadow-hard);
}

.btn-primary:hover {
  background-color: var(--ink);
  border-color: var(--ink);
  color: var(--paper);
  transform: translate(-1px, -1px);
}

.btn-ghost {
  background-color: transparent;
  color: var(--text-main);
  border-color: var(--ink);
}

.btn-ghost:hover {
  color: var(--accent);
  border-color: var(--accent);
  transform: translate(-1px, -1px);
}

.btn-outline {
  background-color: transparent;
  color: var(--text-main);
  border-color: var(--ink);
}

.btn-outline:hover {
  color: var(--accent);
  border-color: var(--accent);
}

.text-link {
  font-size: 15px;
  font-weight: 700;
  color: var(--accent-cyan);
  border-bottom: 1px solid var(--accent-cyan);
}

.text-link:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.tag {
  display: inline-block;
  padding: 1px 7px;
  font-size: 12px;
  font-weight: 700;
  line-height: 1.7;
  border-radius: 3px;
  white-space: nowrap;
}

.tag-main {
  background-color: var(--accent);
  color: #ffffff;
}

.tag-sub {
  background-color: transparent;
  color: var(--accent-cyan);
  border: 1px solid var(--accent-cyan);
}

.state {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  padding: 1px 7px;
  border-radius: 3px;
  white-space: nowrap;
}

.state-ongoing {
  color: var(--accent-cyan);
  border: 1px solid var(--accent-cyan);
}

.state-finished {
  color: var(--grid-gray);
  border: 1px solid var(--grid-gray);
}

.state-paused {
  color: var(--accent);
  border: 1px solid var(--accent);
}

.status-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--accent-cyan);
  margin-right: 6px;
}

.status-ongoing .status-dot {
  background-color: var(--accent-cyan);
}

.status-hiatus .status-dot {
  background-color: var(--accent);
}

.status-completed .status-dot {
  background-color: var(--grid-gray);
}

/* 通用 section 骨架 */
.section {
  margin-bottom: 52px;
}

.section-head {
  margin-bottom: 22px;
}

.section-title {
  font-size: 22px;
  font-weight: 900;
  padding-left: 11px;
  border-left: 3px solid var(--accent);
  margin-bottom: 8px;
}

.section-note,
.section-lead {
  font-size: 15px;
  color: var(--text-sub);
  margin: 0;
}

.section-foot {
  margin-top: 18px;
}

.section-action {
  margin-top: 22px;
}

/* 折叠问答 */
.faq-item {
  border: 2px solid var(--ink);
  border-radius: var(--radius);
  background-color: var(--surface);
  margin-bottom: 10px;
  overflow: hidden;
}

.faq-question,
.faq-item > summary {
  display: block;
  position: relative;
  padding: 13px 44px 13px 16px;
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  list-style: none;
}

.faq-question::-webkit-details-marker,
.faq-item > summary::-webkit-details-marker {
  display: none;
}

.faq-question::after,
.faq-item > summary::after {
  content: "+";
  position: absolute;
  right: 16px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 20px;
  color: var(--accent);
}

.faq-item[open] > summary::after {
  content: "–";
}

.faq-answer,
.faq-body {
  padding: 0 16px 16px;
  border-top: 1px dashed var(--line);
  padding-top: 14px;
}

.faq-answer p,
.faq-body p {
  font-size: 15px;
  color: var(--text-sub);
  margin-bottom: 10px;
}

.faq-more {
  font-size: 14px;
  font-weight: 700;
  color: var(--accent-cyan);
}

.faq-more:hover {
  color: var(--accent);
}

/* 通用图片容器 */
.hero-figure,
.topic-card-figure,
.section-media,
.flow-media,
.glossary-figure,
.page-figure,
.section-figure {
  border: 2px solid var(--ink);
  border-radius: var(--radius);
  overflow: hidden;
  background-color: var(--surface-alt);
}

.hero-figure img,
.topic-card-figure img,
.section-media img,
.flow-media img,
.glossary-figure img,
.page-figure img,
.section-figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-caption,
.media-caption,
.figure-caption,
.glossary-figure figcaption,
.page-figure figcaption {
  font-size: 13px;
  color: var(--text-sub);
  padding: 8px 12px;
  border-top: 1px solid var(--line);
  background-color: var(--surface);
}

/* --------------------------------------------------------------------------
   4. pages — 首页
   -------------------------------------------------------------------------- */

.home-main {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 34px 24px 0;
}

/* 首屏双栏 */
.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 40px;
  align-items: start;
  margin-bottom: 56px;
  border-bottom: 3px solid var(--ink);
  padding-bottom: 44px;
}

.hero-wide {
  min-width: 0;
}

.hero-title {
  font-size: 44px;
  font-weight: 900;
  line-height: 1.24;
  position: relative;
  padding-bottom: 14px;
  margin-bottom: 16px;
}

.hero-title::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 78px;
  height: 4px;
  background-color: var(--accent);
}

.hero-lead {
  font-size: 17px;
  color: var(--text-sub);
  max-width: 640px;
  margin-bottom: 22px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 28px;
}

.hero-figure {
  position: relative;
}

.hero-figure img {
  aspect-ratio: 16 / 9;
}

.hero-side {
  border: 2px solid var(--ink);
  border-radius: var(--radius);
  background-color: var(--surface-alt);
  padding: 20px;
  min-width: 0;
}

.side-title {
  font-size: 17px;
  font-weight: 900;
  padding-bottom: 10px;
  margin-bottom: 14px;
  border-bottom: 2px solid var(--ink);
}

.topic-chip-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
}

.topic-chip {
  display: inline-block;
  padding: 6px 12px;
  font-size: 14px;
  font-weight: 700;
  border: 1px solid var(--ink);
  border-radius: var(--radius-sm);
  background-color: var(--surface);
}

.topic-chip:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.side-note {
  font-size: 14px;
  color: var(--text-sub);
  margin: 0;
}

/* 最近更新条目带 */
.cover-card-track {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 16px;
}

.cover-card {
  min-width: 0;
}

.cover-card-link {
  display: flex;
  flex-direction: column;
  gap: 8px;
  height: 100%;
  padding: 10px;
  border: 2px solid var(--ink);
  border-radius: var(--radius);
  background-color: var(--surface);
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.cover-card-link:hover {
  transform: translateY(-3px);
  border-color: var(--accent);
}

.cover-card-img {
  width: 100%;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  border-radius: var(--radius-sm);
  background-color: var(--surface-alt);
}

.cover-card-name {
  font-size: 15px;
  font-weight: 700;
  line-height: 1.5;
}

/* 追更更新榜 */
.ranking-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px 28px;
  counter-reset: rank;
}

.ranking-row {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr) auto auto auto;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background-color: var(--surface);
}

.ranking-row:hover {
  border-color: var(--accent);
}

.rank-no {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.06em;
}

.rank-name {
  font-size: 15px;
  font-weight: 700;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.rank-link {
  font-size: 13px;
  font-weight: 700;
  color: var(--accent-cyan);
  white-space: nowrap;
}

.rank-link:hover {
  color: var(--accent);
}

/* 题材分类对照 */
.compare-columns {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.compare-col {
  min-width: 0;
  border: 2px solid var(--ink);
  border-radius: var(--radius);
  background-color: var(--surface);
  padding: 18px;
}

.compare-col-title {
  font-size: 17px;
  font-weight: 900;
  padding-bottom: 9px;
  margin-bottom: 10px;
  border-bottom: 2px solid var(--accent);
}

.compare-col-note {
  font-size: 14px;
  color: var(--text-sub);
  margin-bottom: 12px;
}

.compare-link-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

/* 阅读与离线说明摘要 */
.summary-blocks {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}

.summary-block {
  min-width: 0;
  border: 2px solid var(--ink);
  border-radius: var(--radius);
  background-color: var(--surface-alt);
  padding: 20px;
}

.summary-block-title {
  font-size: 17px;
  font-weight: 900;
  margin-bottom: 10px;
}

.summary-block-text {
  font-size: 15px;
  color: var(--text-sub);
  margin-bottom: 16px;
}

/* 词条目录摘要 */
.glossary-index-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.glossary-chip {
  display: inline-block;
  padding: 8px 14px;
  font-size: 14px;
  font-weight: 700;
  border: 2px solid var(--ink);
  border-radius: var(--radius-sm);
  background-color: var(--surface);
}

.glossary-chip:hover {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
}

/* --------------------------------------------------------------------------
   4. pages — 题材索引
   -------------------------------------------------------------------------- */

.page-category .page-hero {
  margin-bottom: 40px;
}

.page-summary {
  font-size: 16px;
  color: var(--text-sub);
  max-width: 780px;
}

.topic-columns {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.topic-column {
  min-width: 0;
  border: 2px solid var(--ink);
  border-radius: var(--radius);
  background-color: var(--surface);
  padding: 18px;
}

.topic-column-title {
  font-size: 17px;
  font-weight: 900;
  padding-bottom: 9px;
  margin-bottom: 10px;
  border-bottom: 2px solid var(--accent);
}

.topic-column-desc {
  font-size: 14px;
  color: var(--text-sub);
  margin-bottom: 12px;
}

.topic-link-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.topic-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}

.topic-card {
  min-width: 0;
  display: flex;
  flex-direction: column;
  border: 2px solid var(--ink);
  border-radius: var(--radius);
  background-color: var(--surface);
  overflow: hidden;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.topic-card:hover {
  transform: translateY(-3px);
  border-color: var(--accent);
}

.topic-card-figure {
  border: 0;
  border-bottom: 2px solid var(--ink);
  border-radius: 0;
}

.topic-card-figure img {
  aspect-ratio: 16 / 9;
}

.topic-card-body {
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  flex: 1 1 auto;
}

.topic-card-title {
  font-size: 17px;
  font-weight: 900;
}

.topic-card-desc {
  font-size: 14px;
  color: var(--text-sub);
  margin: 0;
}

.topic-tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.topic-tag {
  display: inline-block;
  padding: 1px 8px;
  font-size: 12px;
  font-weight: 700;
  border-radius: 3px;
  border: 1px solid var(--grid-gray);
  color: var(--text-sub);
}

.topic-tag-primary {
  background-color: var(--accent);
  border-color: var(--accent);
  color: #ffffff;
}

.topic-card-meta {
  font-size: 13px;
  color: var(--text-sub);
  margin: 0;
  padding-top: 8px;
  border-top: 1px dashed var(--line);
}

.clue-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.clue-item {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 14px;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background-color: var(--surface);
}

.clue-num {
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.06em;
}

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

.clue-title {
  font-size: 16px;
  font-weight: 900;
  margin-bottom: 4px;
}

.clue-text {
  font-size: 14px;
  color: var(--text-sub);
  margin: 0;
}

.related-links {
  margin-bottom: 52px;
}

.related-link {
  display: block;
  padding: 16px 18px;
  border: 2px solid var(--ink);
  border-radius: var(--radius);
  background-color: var(--surface-alt);
  margin-bottom: 12px;
}

.related-link:hover {
  border-color: var(--accent);
}

.related-link-title {
  display: block;
  font-size: 16px;
  font-weight: 900;
  margin-bottom: 4px;
}

.related-link-desc {
  display: block;
  font-size: 14px;
  color: var(--text-sub);
}

/* --------------------------------------------------------------------------
   4. pages — 更新榜
   -------------------------------------------------------------------------- */

.content-section {
  margin-bottom: 48px;
}

.basis-cards {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.basis-card {
  min-width: 0;
  border: 2px solid var(--ink);
  border-left-width: 5px;
  border-left-color: var(--accent);
  border-radius: var(--radius);
  background-color: var(--surface);
  padding: 16px;
}

.basis-card-title {
  font-size: 16px;
  font-weight: 900;
  margin-bottom: 8px;
}

.basis-card-text {
  font-size: 14px;
  color: var(--text-sub);
  margin: 0;
}

.rank-group {
  margin-bottom: 30px;
}

.rank-group-title {
  font-size: 17px;
  font-weight: 900;
  padding-bottom: 8px;
  margin-bottom: 6px;
  border-bottom: 2px solid var(--ink);
}

.rank-group-note {
  font-size: 14px;
  color: var(--text-sub);
  margin-bottom: 12px;
}

.rank-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.rank-row {
  display: grid;
  grid-template-columns: 36px minmax(0, 1fr) auto auto auto;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background-color: var(--surface);
}

.rank-row:hover {
  border-color: var(--accent);
}

.rank-num {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.06em;
}

.rank-tag,
.rank-status {
  font-size: 12px;
  font-weight: 700;
  padding: 1px 8px;
  border-radius: 3px;
  white-space: nowrap;
}

.rank-tag {
  background-color: var(--paper-soft);
  color: var(--text-sub);
  border: 1px solid var(--line);
}

.rank-status {
  color: var(--accent-cyan);
  border: 1px solid var(--accent-cyan);
}

.compare-table {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}

.compare-table .compare-col {
  border-radius: var(--radius);
}

.compare-list {
  display: flex;
  flex-direction: column;
  gap: 9px;
}

.compare-list li {
  font-size: 14px;
  color: var(--text-sub);
  padding-left: 14px;
  position: relative;
}

.compare-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 6px;
  height: 6px;
  background-color: var(--accent-cyan);
  border-radius: 1px;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.related-card {
  display: block;
  min-width: 0;
  padding: 16px;
  border: 2px solid var(--ink);
  border-radius: var(--radius);
  background-color: var(--surface-alt);
}

.related-card:hover {
  border-color: var(--accent);
}

.related-card-title {
  font-size: 16px;
  font-weight: 900;
  margin-bottom: 6px;
}

.related-card-text {
  font-size: 14px;
  color: var(--text-sub);
  margin: 0;
}

/* --------------------------------------------------------------------------
   4. pages — 离线阅读说明
   -------------------------------------------------------------------------- */

.page-title-block {
  margin-bottom: 32px;
}

.section-media {
  margin-bottom: 20px;
}

.section-media img {
  aspect-ratio: 21 / 9;
}

.compare-head {
  font-size: 16px;
  font-weight: 900;
  padding-bottom: 8px;
  margin-bottom: 10px;
  border-bottom: 2px solid var(--accent);
}

.flow-columns {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
}

.flow-col {
  min-width: 0;
  border: 2px solid var(--ink);
  border-radius: var(--radius);
  background-color: var(--surface);
  padding: 18px;
}

.flow-col-title {
  font-size: 17px;
  font-weight: 900;
  margin-bottom: 12px;
}

.flow-media {
  margin-bottom: 14px;
}

.flow-media img {
  aspect-ratio: 4 / 3;
}

.flow-steps {
  list-style: none;
  counter-reset: flow;
  display: flex;
  flex-direction: column;
  gap: 9px;
}

.flow-steps li {
  position: relative;
  padding-left: 34px;
  font-size: 14px;
  color: var(--text-sub);
  counter-increment: flow;
}

.flow-steps li::before {
  content: counter(flow);
  position: absolute;
  left: 0;
  top: 2px;
  width: 22px;
  height: 22px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  color: #ffffff;
  background-color: var(--accent);
  border-radius: 3px;
}

.method-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.method-item {
  padding: 16px;
  border: 1px solid var(--line);
  border-left: 4px solid var(--accent-cyan);
  border-radius: var(--radius-sm);
  background-color: var(--surface);
}

.method-title {
  font-size: 16px;
  font-weight: 900;
  margin-bottom: 6px;
}

.method-text {
  font-size: 14px;
  color: var(--text-sub);
  margin: 0;
}

.fix-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.fix-item {
  padding: 16px;
  border: 1px solid var(--line);
  border-left: 4px solid var(--accent);
  border-radius: var(--radius-sm);
  background-color: var(--surface);
}

.fix-title {
  font-size: 16px;
  font-weight: 900;
  margin-bottom: 6px;
}

.fix-text {
  font-size: 14px;
  color: var(--text-sub);
  margin: 0;
}

.section-related .related-grid {
  list-style: none;
}

.related-title {
  font-size: 16px;
  font-weight: 900;
  margin-bottom: 6px;
}

.related-text {
  font-size: 14px;
  color: var(--text-sub);
  margin: 0;
}

/* --------------------------------------------------------------------------
   4. pages — 词条目录
   -------------------------------------------------------------------------- */

.glossary-section {
  margin-bottom: 44px;
}

.glossary-figure {
  margin-bottom: 34px;
}

.glossary-figure img {
  aspect-ratio: 21 / 9;
}

.term-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  border-top: 2px solid var(--ink);
}

.term-item {
  display: grid;
  grid-template-columns: 150px minmax(0, 1fr);
  gap: 20px;
  padding: 14px 4px;
  border-bottom: 1px solid var(--line);
}

.term-name {
  font-size: 16px;
  font-weight: 900;
  color: var(--accent);
}

.term-desc {
  margin: 0;
  font-size: 15px;
  color: var(--text-sub);
}

.glossary-section table.compare-table {
  display: table;
  border: 2px solid var(--ink);
  border-radius: var(--radius);
  background-color: var(--surface);
}

.glossary-section table.compare-table caption {
  caption-side: top;
  text-align: left;
  font-size: 14px;
  color: var(--text-sub);
  padding: 10px 12px;
}

.glossary-section table.compare-table th,
.glossary-section table.compare-table td {
  border: 1px solid var(--line);
  padding: 11px 14px;
  font-size: 14px;
  text-align: left;
  vertical-align: top;
}

.glossary-section table.compare-table thead th {
  background-color: var(--paper-soft);
  font-weight: 900;
  color: var(--text-main);
}

.glossary-section table.compare-table tbody tr:nth-child(even) {
  background-color: var(--surface-alt);
}

.related-section {
  margin-bottom: 52px;
}

.related-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.related-item {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 12px;
  padding: 13px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background-color: var(--surface);
}

.related-item a {
  font-size: 15px;
  font-weight: 700;
  color: var(--accent-cyan);
}

.related-item a:hover {
  color: var(--accent);
}

.related-note {
  font-size: 14px;
  color: var(--text-sub);
}

/* --------------------------------------------------------------------------
   4. pages — 常见问答
   -------------------------------------------------------------------------- */

.faq-group {
  margin-bottom: 42px;
}

.faq-group > h2 {
  font-size: 22px;
  padding-left: 11px;
  border-left: 3px solid var(--accent);
  margin-bottom: 8px;
}

.faq-group .section-note {
  margin-bottom: 16px;
}

.faq-next {
  margin-bottom: 42px;
}

.faq-next > h2 {
  font-size: 22px;
  padding-left: 11px;
  border-left: 3px solid var(--accent);
  margin-bottom: 16px;
}

.faq-next-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.faq-next-item {
  min-width: 0;
  padding: 16px;
  border: 2px solid var(--ink);
  border-radius: var(--radius);
  background-color: var(--surface-alt);
}

.faq-next-item h3 {
  font-size: 16px;
  margin-bottom: 6px;
}

.faq-next-item h3 a {
  color: var(--accent-cyan);
}

.faq-next-item h3 a:hover {
  color: var(--accent);
}

.faq-next-item p {
  font-size: 14px;
  color: var(--text-sub);
  margin: 0;
}

/* --------------------------------------------------------------------------
   4. pages — 纠错反馈
   -------------------------------------------------------------------------- */

.compare-block {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}

.compare-title {
  font-size: 16px;
  font-weight: 900;
  padding-bottom: 8px;
  margin-bottom: 10px;
  border-bottom: 2px solid var(--accent);
}

.checklist {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.checklist-item {
  display: grid;
  grid-template-columns: 26px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  padding: 13px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background-color: var(--surface);
}

.checklist-label {
  width: 20px;
  height: 20px;
  margin-top: 3px;
  border: 2px solid var(--accent);
  border-radius: 3px;
  position: relative;
}

.checklist-label::after {
  content: "";
  position: absolute;
  left: 4px;
  top: 1px;
  width: 6px;
  height: 10px;
  border-right: 2px solid var(--accent);
  border-bottom: 2px solid var(--accent);
  transform: rotate(40deg);
}

.checklist-text {
  font-size: 15px;
  color: var(--text-sub);
}

.section-figure {
  margin-bottom: 20px;
}

.section-figure img {
  aspect-ratio: 21 / 9;
}

.process-steps {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.process-step {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 16px;
  border: 2px solid var(--ink);
  border-radius: var(--radius);
  background-color: var(--surface);
}

.process-step .step-index {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.08em;
}

.process-step .step-title {
  font-size: 16px;
  font-weight: 900;
}

.process-step .step-text {
  font-size: 14px;
  color: var(--text-sub);
}

.section-footnote {
  margin-top: 18px;
  font-size: 14px;
  color: var(--text-sub);
}

.link-block-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.link-block {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
  padding: 16px;
  border: 2px solid var(--ink);
  border-radius: var(--radius);
  background-color: var(--surface-alt);
}

.link-block:hover {
  border-color: var(--accent);
}

.link-block-title {
  font-size: 16px;
  font-weight: 900;
}

.link-block-desc {
  font-size: 14px;
  color: var(--text-sub);
}

/* --------------------------------------------------------------------------
   4. pages — 404
   -------------------------------------------------------------------------- */

.error-main {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 64px 24px 72px;
}

.error-hero {
  max-width: 620px;
  border: 2px solid var(--ink);
  border-radius: var(--radius);
  background-color: var(--surface-alt);
  padding: 32px;
}

.error-code {
  font-family: var(--font-mono);
  font-size: 48px;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.08em;
  margin: 0 0 8px;
}

.error-title {
  font-size: 30px;
  margin-bottom: 14px;
}

.error-text {
  font-size: 15px;
  color: var(--text-sub);
}

.error-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 22px;
}

/* --------------------------------------------------------------------------
   5. responsive — 1024 / 768 / 480
   -------------------------------------------------------------------------- */

@media (max-width: 1024px) {
  .page-layout {
    grid-template-columns: minmax(0, 1fr);
    gap: 32px;
  }

  .page-aside,
  .topic-toc {
    position: static;
    top: auto;
  }

  .hero {
    grid-template-columns: minmax(0, 1fr);
    gap: 28px;
  }

  .cover-card-track {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .process-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .footer-inner {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 768px) {
  body {
    font-size: 15px;
    line-height: 1.75;
  }

  .header-inner {
    min-height: 62px;
    padding: 0 16px;
    gap: 12px;
  }

  .nav-toggle {
    display: flex;
    order: 3;
  }

  .theme-toggle {
    order: 2;
    margin-left: auto;
  }

  .site-nav {
    order: 4;
    flex: 0 0 100%;
    width: 100%;
  }

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px 0 14px;
  }

  .nav-list.is-open {
    display: flex;
  }

  .nav-link {
    display: flex;
    align-items: center;
    min-height: 48px;
    padding: 10px 4px;
    font-size: 16px;
    border-bottom: 1px solid var(--line);
  }

  .nav-link.is-current {
    border-bottom-color: var(--accent);
  }

  .inner-main,
  .home-main {
    padding-left: 16px;
    padding-right: 16px;
  }

  .page-title {
    font-size: 26px;
  }

  .hero-title {
    font-size: 26px;
  }

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

  .section-title {
    font-size: 19px;
  }

  .section {
    margin-bottom: 40px;
  }

  .cover-card-track {
    display: flex;
    gap: 12px;
    overflow-x: auto;
    padding-bottom: 8px;
    scroll-snap-type: x mandatory;
    -webkit-overflow-scrolling: touch;
  }

  .cover-card {
    flex: 0 0 46%;
    scroll-snap-align: start;
  }

  .ranking-list {
    grid-template-columns: minmax(0, 1fr);
    gap: 8px;
  }

  .ranking-row,
  .rank-row {
    grid-template-columns: 30px minmax(0, 1fr) auto;
    gap: 8px;
  }

  .ranking-row .state,
  .ranking-row .rank-link,
  .rank-row .rank-status,
  .rank-row .rank-link {
    grid-column: 3;
  }

  .ranking-row .tag,
  .rank-row .rank-tag {
    grid-column: 2;
    justify-self: start;
  }

  .compare-columns,
  .topic-columns,
  .basis-cards,
  .related-grid,
  .link-block-grid,
  .faq-next-list {
    grid-template-columns: minmax(0, 1fr);
  }

  .summary-blocks,
  .flow-columns,
  .compare-table,
  .compare-block,
  .topic-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .process-steps {
    grid-template-columns: minmax(0, 1fr);
  }

  .glossary-section table.compare-table {
    display: block;
    overflow-x: auto;
  }

  .term-item {
    grid-template-columns: minmax(0, 1fr);
    gap: 4px;
  }

  .footer-inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 22px;
    padding: 30px 16px 20px;
  }

  .footer-bottom {
    padding: 16px 16px 22px;
  }

  .error-main {
    padding: 40px 16px 56px;
  }

  .error-hero {
    padding: 24px;
  }

  .error-code {
    font-size: 38px;
  }

  .error-title {
    font-size: 24px;
  }
}

@media (max-width: 480px) {
  .cover-card {
    flex: 0 0 62%;
  }

  .hero-actions .btn,
  .error-actions .btn {
    width: 100%;
  }

  .clue-item {
    grid-template-columns: 32px minmax(0, 1fr);
    gap: 10px;
  }

  .checklist-item {
    grid-template-columns: 22px minmax(0, 1fr);
    gap: 10px;
  }
}

/* 增强动效：仅在支持时淡入，不影响初始可见性 */
@media (prefers-reduced-motion: no-preference) {
  .cover-card-link,
  .topic-card,
  .related-card,
  .link-block {
    transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
  }

  .cover-card-link:hover,
  .topic-card:hover,
  .related-card:hover,
  .link-block:hover {
    box-shadow: var(--shadow-soft);
  }
}