/* ==========================================================================
   51吃瓜网官网 · 全站样式表
   结构：base → layout → components → pages → responsive
   ========================================================================== */

/* --------------------------------------------------------------------------
   base：变量、重置、排版基础
   -------------------------------------------------------------------------- */
:root {
  --canvas: #F4F6FA;
  --ink: #14161C;
  --ink-soft: #59617A;
  --brand: #0FA3A3;
  --brand-dark: #0B7C7C;
  --state-orange: #FF6A2B;
  --state-green: #1FA85C;
  --state-blue: #2F6BFF;
  --line: #E1E5EF;
  --surface: #FFFFFF;
  --radius: 8px;
  --radius-sm: 4px;
  --shell: 1120px;
  --gutter: 24px;
}

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

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

body {
  margin: 0;
  background: var(--canvas);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 15px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3,
h4 {
  margin: 0;
  font-weight: 700;
  line-height: 1.35;
}

h1 {
  font-size: 32px;
  font-weight: 700;
  color: var(--ink);
}

h2 {
  font-size: 22px;
  font-weight: 700;
}

h3 {
  font-size: 17px;
  font-weight: 600;
}

p {
  margin: 0;
}

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

a {
  color: var(--brand-dark);
  text-decoration: none;
}

a:hover,
a:focus-visible {
  color: var(--brand);
}

img {
  max-width: 100%;
  border: 0;
}

figure {
  margin: 0;
}

button {
  font: inherit;
  color: inherit;
}

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

/* --------------------------------------------------------------------------
   layout：站点骨架（页头 / 导航 / 主容器 / 页脚）
   -------------------------------------------------------------------------- */
.site-body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--canvas);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: var(--surface);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 var(--gutter);
  height: 64px;
  display: flex;
  align-items: center;
  gap: 20px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
  color: var(--ink);
  font-weight: 700;
}

.brand:hover,
.brand:focus-visible {
  color: var(--ink);
}

.brand-mark {
  width: 28px;
  height: 28px;
  border-radius: 6px;
  background: var(--brand);
  position: relative;
  flex: 0 0 auto;
}

.brand-mark::after {
  content: "";
  position: absolute;
  inset: 8px 9px 8px 8px;
  background: var(--surface);
  border-radius: 2px 6px 2px 6px;
}

.brand-text {
  font-size: 17px;
  white-space: nowrap;
}

.main-nav {
  margin-left: auto;
}

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

.nav-item {
  position: relative;
}

.nav-item > a {
  display: flex;
  align-items: center;
  height: 40px;
  padding: 0 12px;
  border-radius: 6px;
  color: var(--ink);
  font-size: 14.5px;
  font-weight: 500;
  white-space: nowrap;
}

.nav-item > a:hover,
.nav-item > a:focus-visible {
  background: var(--canvas);
  color: var(--brand-dark);
}

.nav-item.is-current > a,
.nav-item > a.is-current {
  color: var(--brand-dark);
  background: rgba(15, 163, 163, 0.1);
  font-weight: 600;
}

.nav-panel {
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  min-width: 200px;
  padding: 8px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 0 8px 20px rgba(20, 22, 28, 0.08);
  display: none;
  flex-direction: column;
  gap: 2px;
}

.nav-item.has-panel:hover .nav-panel,
.nav-item.has-panel:focus-within .nav-panel,
.nav-item.has-panel .nav-panel.is-open {
  display: flex;
}

.nav-panel a {
  display: flex;
  align-items: center;
  min-height: 40px;
  padding: 0 10px;
  border-radius: 6px;
  color: var(--ink);
  font-size: 14px;
}

.nav-panel a:hover,
.nav-panel a:focus-visible,
.nav-panel a.is-current {
  background: var(--canvas);
  color: var(--brand-dark);
}

.nav-toggle {
  display: none;
  width: 48px;
  height: 48px;
  margin-left: auto;
  padding: 0;
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 6px;
  cursor: pointer;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
}

.nav-toggle-bar {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--ink);
  border-radius: 1px;
}

.site-main {
  flex: 1 0 auto;
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 32px var(--gutter) 56px;
}

.home-main {
  padding-top: 28px;
}

.inner-main {
  padding-top: 24px;
}

.site-footer {
  margin-top: auto;
  background: var(--surface);
  border-top: 1px solid var(--line);
}

.footer-inner {
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 36px var(--gutter) 24px;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 28px 32px;
}

.footer-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 12px;
}

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

.footer-list a {
  color: var(--ink-soft);
  font-size: 13.5px;
  min-height: 24px;
  display: inline-flex;
  align-items: center;
}

.footer-list a:hover,
.footer-list a:focus-visible {
  color: var(--brand);
}

.footer-bottom {
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 16px var(--gutter) 24px;
  border-top: 1px solid var(--line);
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.brand-footer .brand-mark {
  width: 22px;
  height: 22px;
}

.brand-footer .brand-mark::after {
  inset: 6px 7px 6px 6px;
}

.brand-footer .brand-text {
  font-size: 15px;
}

.footer-slogan {
  color: var(--ink-soft);
  font-size: 13px;
  margin-right: auto;
}

/* --------------------------------------------------------------------------
   components：通用元件
   -------------------------------------------------------------------------- */

/* 面包屑 */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--ink-soft);
  margin-bottom: 14px;
  flex-wrap: wrap;
}

.breadcrumb a {
  color: var(--ink-soft);
}

.breadcrumb a:hover,
.breadcrumb a:focus-visible {
  color: var(--brand);
}

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

.breadcrumb-current {
  color: var(--ink);
}

/* 页面标题区 */
.page-header {
  margin-bottom: 14px;
}

.page-title {
  font-size: 32px;
  font-weight: 700;
  color: var(--ink);
  line-height: 1.3;
}

.page-hero,
.page-head {
  margin-bottom: 28px;
}

.page-lead {
  max-width: 720px;
  font-size: 15px;
  color: var(--ink);
}

.note-line,
.note-bar {
  max-width: 720px;
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--ink-soft);
  border-left: 3px solid var(--line);
  padding-left: 10px;
}

.caption-note,
.fine-note {
  max-width: 720px;
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--ink-soft);
}

/* 区块标题 */
.section-title {
  font-size: 22px;
  font-weight: 700;
  color: var(--ink);
  padding-left: 12px;
  position: relative;
  margin-bottom: 14px;
}

.section-title::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  bottom: 4px;
  width: 4px;
  border-radius: 2px;
  background: var(--brand);
}

.section-lead,
.section-desc,
.section-intro {
  max-width: 720px;
  color: var(--ink-soft);
  font-size: 14.5px;
  margin-bottom: 16px;
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 20px;
  border-radius: var(--radius);
  font-size: 15px;
  font-weight: 600;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background-color 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}

.btn-primary {
  background: var(--brand);
  color: #FFFFFF;
}

.btn-primary:hover,
.btn-primary:focus-visible {
  background: var(--brand-dark);
  color: #FFFFFF;
}

.btn-ghost {
  background: var(--surface);
  color: var(--brand-dark);
  border-color: var(--line);
}

.btn-ghost:hover,
.btn-ghost:focus-visible {
  border-color: var(--brand);
  color: var(--brand-dark);
}

/* 文本链接 */
.text-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 32px;
  font-size: 14px;
  font-weight: 600;
  color: var(--brand-dark);
}

.text-link::after {
  content: "→";
  font-size: 13px;
}

.text-link:hover,
.text-link:focus-visible {
  color: var(--brand);
}

/* 标签与徽标 */
.tag,
.tag-pill {
  display: inline-flex;
  align-items: center;
  padding: 2px 10px;
  border-radius: 999px;
  background: var(--canvas);
  border: 1px solid var(--line);
  color: var(--ink-soft);
  font-size: 12px;
  line-height: 1.6;
  white-space: nowrap;
}

.tag-pill {
  min-height: 44px;
  padding: 0 16px;
  font-size: 13.5px;
  color: var(--ink);
  background: var(--surface);
  font-weight: 500;
}

.tag-pill:hover,
.tag-pill:focus-visible {
  border-color: var(--brand);
  color: var(--brand-dark);
}

.tag-pill-sm {
  min-height: 24px;
  padding: 0 10px;
  font-size: 12px;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 2px 10px;
  border-radius: var(--radius-sm);
  font-size: 12px;
  line-height: 1.6;
  font-weight: 600;
  border: 1px solid currentColor;
  background: transparent;
}

.badge-orange,
.badge-ongoing,
.status-ongoing {
  color: var(--state-orange);
}

.badge-green,
.badge-finished,
.status-done {
  color: var(--state-green);
}

.badge-blue {
  color: var(--state-blue);
}

.status {
  display: inline-flex;
  align-items: center;
  padding: 2px 10px;
  border-radius: var(--radius-sm);
  font-size: 12px;
  font-weight: 600;
  border: 1px solid currentColor;
}

/* 封面卡（首页与题材目录共用） */
.cover-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform 0.18s ease, border-color 0.18s ease;
  display: flex;
  flex-direction: column;
}

.cover-card:hover,
.cover-card:focus-within {
  transform: translateY(-2px);
  border-color: var(--brand);
}

.cover-link {
  display: flex;
  flex-direction: column;
  height: 100%;
  color: var(--ink);
}

.cover-link:hover,
.cover-link:focus-visible {
  color: var(--ink);
}

.cover-media {
  margin: 0;
  aspect-ratio: 3 / 4;
  background: var(--canvas);
  overflow: hidden;
}

.cover-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.cover-body {
  padding: 12px 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.cover-name,
.cover-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
  line-height: 1.45;
}

.cover-name a,
.cover-title a {
  color: var(--ink);
}

.cover-name a:hover,
.cover-name a:focus-visible,
.cover-title a:hover,
.cover-title a:focus-visible {
  color: var(--brand-dark);
}

.cover-desc,
.cover-summary {
  font-size: 13px;
  line-height: 1.65;
  color: var(--ink-soft);
}

.cover-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
}

/* 结论配对块 */
.today-conclusion,
.updates-conclusion {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  align-self: start;
}

.today-conclusion p,
.updates-conclusion p {
  font-size: 14.5px;
  color: var(--ink);
}

.today-conclusion .note-bar,
.updates-conclusion .note-bar {
  margin-top: 0;
}

/* 层级条（榜单速览与榜单页共用） */
.rank-list {
  display: flex;
  flex-direction: column;
}

.rank-row {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 12px 4px;
  border-bottom: 1px solid var(--line);
}

.rank-row:last-child {
  border-bottom: 0;
}

.rank-no {
  flex: 0 0 32px;
  font-size: 15px;
  font-weight: 700;
  color: var(--ink-soft);
  font-variant-numeric: tabular-nums;
}

.rank-name {
  flex: 0 0 auto;
  font-size: 15px;
  font-weight: 600;
}

.rank-name a {
  color: var(--ink);
}

.rank-name a:hover,
.rank-name a:focus-visible {
  color: var(--brand-dark);
}

.rank-reason {
  flex: 1 1 auto;
  min-width: 220px;
  font-size: 13.5px;
  color: var(--ink-soft);
}

/* 步骤列表 */
.step-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 18px;
}

.step-item {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px;
}

.step-no,
.step-num,
.step-index {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 6px;
  background: rgba(15, 163, 163, 0.12);
  color: var(--brand-dark);
  font-size: 13px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.step-name,
.step-title {
  margin: 10px 0 6px;
  font-size: 16px;
  font-weight: 600;
  color: var(--ink);
}

.step-text,
.step-desc {
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-soft);
}

/* FAQ 折叠项 */
.faq-item {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 0 18px;
  margin-bottom: 10px;
}

.faq-q,
.faq-question {
  display: flex;
  align-items: center;
  min-height: 44px;
  padding: 12px 0;
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
  cursor: pointer;
  list-style: none;
}

.faq-q::-webkit-details-marker,
.faq-question::-webkit-details-marker {
  display: none;
}

.faq-q::after,
.faq-question::after {
  content: "+";
  margin-left: auto;
  padding-left: 12px;
  color: var(--ink-soft);
  font-weight: 700;
}

.faq-item[open] .faq-q::after,
.faq-item[open] .faq-question::after {
  content: "−";
  color: var(--brand);
}

.faq-a,
.faq-answer {
  padding: 0 0 16px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-soft);
}

.faq-answer p + p {
  margin-top: 8px;
}

/* 相关入口条 */
.related,
.related-bar {
  margin-top: 40px;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
}

.related-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 18px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--ink);
  transition: border-color 0.18s ease, transform 0.18s ease;
}

.related-card:hover,
.related-card:focus-visible {
  border-color: var(--brand);
  transform: translateY(-2px);
  color: var(--ink);
}

.related-card-title,
.related-title,
.related-name {
  font-size: 16px;
  font-weight: 600;
  color: var(--ink);
}

.related-card-text,
.related-desc,
.related-text {
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--ink-soft);
}

.related-tag {
  align-self: flex-start;
  padding: 2px 10px;
  border-radius: 999px;
  background: var(--canvas);
  border: 1px solid var(--line);
  font-size: 12px;
  color: var(--ink-soft);
}

.related-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
}

.related-list .related-card {
  background: var(--surface);
}

/* 锚点条 */
.anchor-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  padding: 12px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  margin-bottom: 28px;
}

.anchor-item,
.anchor-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 16px;
  border-radius: 6px;
  background: var(--canvas);
  color: var(--ink);
  font-size: 13.5px;
  font-weight: 500;
}

.anchor-item:hover,
.anchor-item:focus-visible,
.anchor-link:hover,
.anchor-link:focus-visible,
.anchor-item.is-active,
.anchor-link.is-active {
  background: var(--brand);
  color: #FFFFFF;
}

/* 正文说明块 */
.prose-block {
  max-width: 760px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.prose-block p {
  font-size: 15px;
  color: var(--ink);
}

/* --------------------------------------------------------------------------
   pages：首页
   -------------------------------------------------------------------------- */
.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
  gap: 40px;
  align-items: center;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--line);
}

.hero-copy {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.hero-copy h1 {
  font-size: 34px;
  line-height: 1.25;
}

.hero-lead {
  max-width: 520px;
  font-size: 15.5px;
  color: var(--ink-soft);
}

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

.hero-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.hero-visual {
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.hero-visual img {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  display: block;
  background: var(--surface);
}

.hero-visual .note-bar {
  margin-top: 0;
}

/* 题材标签带 */
.tag-band {
  padding: 36px 0;
  border-bottom: 1px solid var(--line);
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* 今日推荐 */
.today {
  padding: 40px 0;
  border-bottom: 1px solid var(--line);
}

.today-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(260px, 320px);
  gap: 40px;
  align-items: start;
}

.today-grid .section-title {
  grid-column: 1 / -1;
}

.cover-wall {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}

/* 更新脉络 */
.updates {
  padding: 40px 0;
  border-bottom: 1px solid var(--line);
}

.updates-calendar {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(260px, 320px);
  gap: 40px;
  align-items: start;
}

.updates-calendar .section-title {
  grid-column: 1 / -1;
}

.week-grid {
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  gap: 10px;
}

.week-col {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 12px 10px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.week-head {
  font-size: 13px;
  font-weight: 700;
  color: var(--ink);
  padding-bottom: 8px;
  border-bottom: 1px solid var(--line);
  font-variant-numeric: tabular-nums;
}

.week-items {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.week-items li {
  font-size: 12.5px;
  line-height: 1.55;
  color: var(--ink-soft);
}

/* 榜单速览 */
.rank {
  padding: 40px 0;
  border-bottom: 1px solid var(--line);
}

.rank .rank-list {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 4px 18px;
}

.rank .note-bar {
  margin-top: 12px;
}

.rank .text-link {
  margin-top: 12px;
}

/* 专题企划预告 */
.featured {
  padding: 40px 0;
  border-bottom: 1px solid var(--line);
}

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

.feature-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.feature-media {
  margin: 0;
  aspect-ratio: 16 / 9;
  background: var(--canvas);
  overflow: hidden;
}

.feature-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.feature-body {
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.feature-name,
.feature-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--ink);
}

.feature-body p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-soft);
}

/* 阅读帮助三步 */
.reading-steps {
  padding: 40px 0;
  border-bottom: 1px solid var(--line);
}

.reading-steps .text-link {
  margin-top: 16px;
}

/* 首页 FAQ */
.faq {
  padding: 40px 0;
  border-bottom: 1px solid var(--line);
}

/* 站点说明入口条 */
.notice {
  padding: 40px 0 8px;
}

.notice-body {
  display: flex;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
  padding: 24px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.notice-body .section-title {
  margin-bottom: 8px;
}

.notice-body p {
  max-width: 720px;
  font-size: 14px;
  color: var(--ink-soft);
}

.notice-body .btn {
  margin-left: auto;
}

/* --------------------------------------------------------------------------
   pages：内页通用
   -------------------------------------------------------------------------- */

/* 题材目录 */
.topic-anchor-bar {
  position: sticky;
  top: 76px;
  z-index: 20;
}

.topic-block {
  padding: 28px 0;
  border-bottom: 1px solid var(--line);
}

.topic-block:last-of-type {
  border-bottom: 0;
}

.topic-head {
  margin-bottom: 16px;
}

.topic-desc {
  max-width: 720px;
  font-size: 14.5px;
  color: var(--ink-soft);
}

.cover-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}

.topic-block .note-line {
  margin-top: 14px;
}

.tag-usage {
  padding: 32px 0;
  border-top: 1px solid var(--line);
}

/* 更新日历：主内容 + 侧栏 */
.page-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(260px, 320px);
  gap: 40px;
  align-items: start;
}

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

.page-aside {
  display: flex;
  flex-direction: column;
  gap: 20px;
  min-width: 0;
}

.aside-block {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px;
}

.aside-title {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 12px;
}

.aside-block .step-list {
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.aside-block .step-item {
  background: transparent;
  border: 0;
  border-left: 3px solid var(--line);
  border-radius: 0;
  padding: 0 0 0 12px;
  display: flex;
  gap: 10px;
  align-items: flex-start;
}

.aside-block .step-body {
  min-width: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--ink-soft);
}

.aside-text {
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--ink-soft);
}

.year-nav {
  margin-bottom: 32px;
}

.year-block {
  padding: 24px 0;
  border-bottom: 1px solid var(--line);
}

.year-block:last-of-type {
  border-bottom: 0;
}

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

.month-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 132px;
  align-items: stretch;
}

.month-card-body {
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-width: 0;
}

.month-card-title {
  font-size: 16px;
  font-weight: 700;
}

.month-card-text {
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--ink-soft);
}

.month-card-media {
  margin: 0;
  background: var(--canvas);
  overflow: hidden;
}

.month-card-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.status-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.status-badge {
  display: inline-flex;
  align-items: center;
  padding: 2px 10px;
  border-radius: var(--radius-sm);
  font-size: 12px;
  font-weight: 600;
  border: 1px solid currentColor;
}

.status-completed {
  color: var(--state-green);
}

.status-key {
  padding: 28px 0;
  border-top: 1px solid var(--line);
}

.status-key p {
  max-width: 720px;
  font-size: 14.5px;
  color: var(--ink-soft);
  margin-bottom: 10px;
}

.badge-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 12px;
}

.badge-legend-item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--ink-soft);
}

/* 漫画榜单 */
.rank-intro {
  padding: 24px 0;
  border-bottom: 1px solid var(--line);
}

.rank-intro p {
  max-width: 720px;
  font-size: 14.5px;
  color: var(--ink-soft);
  margin-bottom: 10px;
}

.tier-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 16px;
}

.tier-badge {
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  padding: 0 16px;
  border-radius: var(--radius-sm);
  font-size: 13.5px;
  font-weight: 700;
  border: 1px solid currentColor;
}

.tier-badge-a {
  color: var(--state-blue);
}

.tier-badge-b {
  color: var(--brand);
}

.tier-badge-c {
  color: var(--ink-soft);
}

.rank-tier {
  padding: 28px 0;
  border-bottom: 1px solid var(--line);
}

.rank-tier:last-of-type {
  border-bottom: 0;
}

.rank-tier .rank-list {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 4px 18px;
}

.rank-tier .rank-row {
  display: grid;
  grid-template-columns: 32px 72px minmax(0, 1fr);
  column-gap: 14px;
  row-gap: 8px;
  align-items: start;
  padding: 16px 4px;
}

.rank-tier .rank-no {
  padding-top: 2px;
}

.rank-thumb {
  width: 72px;
  height: 96px;
  margin: 0;
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: var(--canvas);
}

.rank-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.rank-body {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.rank-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.rank-rule {
  padding: 28px 0;
  border-top: 1px solid var(--line);
}

.rank-rule p {
  max-width: 720px;
  font-size: 14.5px;
  color: var(--ink-soft);
  margin-bottom: 10px;
}

/* 专题企划 */
.feature-list {
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.feature-list .feature-card {
  display: grid;
  grid-template-columns: minmax(0, 380px) minmax(0, 1fr);
  align-items: stretch;
}

.feature-visual {
  margin: 0;
  background: var(--canvas);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.feature-visual img {
  width: 100%;
  height: 100%;
  min-height: 220px;
  object-fit: cover;
  display: block;
}

.feature-caption {
  padding: 10px 16px;
  font-size: 12px;
  color: var(--ink-soft);
  background: var(--surface);
  border-top: 1px solid var(--line);
}

.feature-list .feature-body {
  padding: 22px;
  gap: 14px;
  min-width: 0;
}

.feature-desc {
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--ink-soft);
}

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

.work-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 0;
  border-bottom: 1px dashed var(--line);
}

.work-item:last-child {
  border-bottom: 0;
}

.work-thumb {
  width: 36px;
  height: 48px;
  object-fit: cover;
  border-radius: var(--radius-sm);
  flex: 0 0 auto;
  background: var(--canvas);
}

.work-name {
  font-size: 14px;
  font-weight: 600;
  color: var(--ink);
  min-width: 120px;
}

.reading-order {
  margin-top: 6px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
}

.reading-order-title {
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 10px;
}

.reading-order-list {
  list-style: decimal;
  padding-left: 20px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.reading-order-list li {
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-soft);
}

.reading-order-guide {
  padding: 32px 0;
  border-top: 1px solid var(--line);
}

.reading-order-guide .step-item {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  min-width: 0;
}

.reading-order-guide .step-body {
  min-width: 0;
}

.maintain {
  padding: 32px 0;
  border-top: 1px solid var(--line);
}

.maintain-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 18px;
}

.maintain-item {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px;
}

.maintain-title {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 8px;
}

.maintain-desc {
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-soft);
}

/* 阅读帮助 */
.glossary {
  padding: 8px 0 32px;
}

.glossary-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 18px;
  margin-top: 18px;
}

.glossary-item {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px;
  border-left: 3px solid var(--brand);
}

.glossary-term {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 8px;
}

.glossary-def {
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink);
  margin-bottom: 6px;
}

.glossary-scene {
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-soft);
}

.help-figure {
  margin: 0 0 32px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.help-figure img {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  display: block;
}

.help-figure figcaption {
  padding: 10px 16px;
  font-size: 12px;
  color: var(--ink-soft);
  border-top: 1px solid var(--line);
}

.steps {
  padding: 32px 0;
  border-top: 1px solid var(--line);
}

.steps .step-item {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  min-width: 0;
}

.steps .step-title {
  margin: 0 0 6px;
}

.steps .step-item > *:last-child {
  min-width: 0;
}

.faq-list {
  padding: 32px 0;
  border-top: 1px solid var(--line);
}

/* 站点说明 */
.position {
  padding: 8px 0 32px;
}

.position > p {
  max-width: 720px;
  font-size: 15px;
  color: var(--ink);
  margin-bottom: 12px;
}

.content-figure {
  margin: 20px 0;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.content-figure img {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  display: block;
}

.content-figure figcaption {
  padding: 10px 16px;
  font-size: 12px;
  color: var(--ink-soft);
  border-top: 1px solid var(--line);
}

.scope-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 10px;
  margin-top: 16px;
}

.scope-list li {
  position: relative;
  padding: 10px 14px 10px 30px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  font-size: 14px;
  color: var(--ink);
}

.scope-list li::before {
  content: "";
  position: absolute;
  left: 12px;
  top: 18px;
  width: 8px;
  height: 8px;
  border-radius: 2px;
  background: var(--brand);
}

.principles {
  padding: 32px 0;
  border-top: 1px solid var(--line);
}

.principles-layout {
  display: grid;
  grid-template-columns: minmax(0, 320px) minmax(0, 1fr);
  gap: 32px;
  margin-top: 18px;
  align-items: start;
}

.principles-list-wrap h3,
.principles-text h3 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 12px;
}

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

.principles-list li {
  padding: 12px 14px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-left: 3px solid var(--brand);
  border-radius: var(--radius-sm);
  font-size: 14px;
  color: var(--ink);
}

.principles-text {
  min-width: 0;
}

.principles-text p {
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--ink-soft);
  margin-bottom: 10px;
}

.correction {
  padding: 32px 0;
  border-top: 1px solid var(--line);
}

.correction > p {
  max-width: 720px;
  font-size: 14.5px;
  color: var(--ink-soft);
  margin-bottom: 18px;
}

.correction-steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 18px;
}

.correction-steps li {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.correction-steps h3 {
  font-size: 16px;
  font-weight: 600;
}

.correction-steps p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-soft);
}

/* 404 */
.error-main {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 40px;
}

.error-block {
  padding: 40px 0 8px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  max-width: 720px;
}

.error-code {
  font-size: 13px;
  font-weight: 700;
  color: var(--state-orange);
  font-variant-numeric: tabular-nums;
}

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

.error-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.error-note {
  font-size: 12px;
  color: var(--ink-soft);
  border-left: 3px solid var(--line);
  padding-left: 10px;
}

.error-links {
  width: 100%;
  padding-top: 28px;
  border-top: 1px solid var(--line);
}

.error-link-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px;
  margin-top: 16px;
}

.error-link-list a {
  display: flex;
  align-items: center;
  min-height: 48px;
  padding: 0 16px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--ink);
  font-size: 14px;
  font-weight: 500;
}

.error-link-list a:hover,
.error-link-list a:focus-visible {
  border-color: var(--brand);
  color: var(--brand-dark);
}

/* --------------------------------------------------------------------------
   responsive：1024 / 768 / 480
   -------------------------------------------------------------------------- */
@media (max-width: 1024px) {
  .page-layout {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-aside {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  }

  .today-grid,
  .updates-calendar {
    grid-template-columns: minmax(0, 1fr);
  }

  .week-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .feature-list .feature-card {
    grid-template-columns: minmax(0, 300px) minmax(0, 1fr);
  }

  .topic-anchor-bar {
    position: static;
  }
}

@media (max-width: 768px) {
  :root {
    --gutter: 18px;
  }

  body {
    font-size: 16px;
    line-height: 1.8;
  }

  h1,
  .page-title {
    font-size: 28px;
  }

  .hero-copy h1 {
    font-size: 28px;
  }

  .section-title {
    font-size: 20px;
  }

  .header-inner {
    height: 60px;
    gap: 12px;
  }

  .nav-toggle {
    display: flex;
  }

  .main-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--surface);
    border-bottom: 1px solid var(--line);
    box-shadow: 0 12px 20px rgba(20, 22, 28, 0.06);
    padding: 8px var(--gutter) 16px;
    max-height: calc(100vh - 60px);
    overflow-y: auto;
  }

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
  }

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

  .nav-item > a {
    height: auto;
    min-height: 48px;
    padding: 0 12px;
    font-size: 15px;
  }

  .nav-item.has-panel {
    display: flex;
    flex-direction: column;
  }

  .nav-panel {
    position: static;
    display: flex;
    min-width: 0;
    margin: 0 0 8px;
    padding: 6px;
    border: 1px solid var(--line);
    box-shadow: none;
    background: var(--canvas);
  }

  .nav-panel a {
    min-height: 44px;
  }

  .site-main {
    padding: 22px var(--gutter) 44px;
  }

  .hero {
    grid-template-columns: minmax(0, 1fr);
    gap: 24px;
    padding-bottom: 30px;
  }

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

  .tag-band,
  .today,
  .updates,
  .rank,
  .featured,
  .reading-steps,
  .faq,
  .notice {
    padding: 28px 0;
  }

  .cover-wall {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
  }

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

  .cover-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
  }

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

  .feature-list .feature-card {
    grid-template-columns: minmax(0, 1fr);
  }

  .feature-visual img {
    min-height: 180px;
  }

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

  .month-card {
    grid-template-columns: minmax(0, 1fr) 108px;
  }

  .principles-layout {
    grid-template-columns: minmax(0, 1fr);
    gap: 22px;
  }

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

  .glossary-list,
  .scope-list,
  .correction-steps,
  .maintain-grid,
  .related-grid,
  .related-list,
  .error-link-list {
    grid-template-columns: minmax(0, 1fr);
  }

  .footer-inner {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px;
    padding: 28px var(--gutter) 18px;
  }

  .rank .rank-list,
  .rank-tier .rank-list {
    padding: 4px 12px;
  }

  .rank .rank-row {
    flex-wrap: wrap;
    row-gap: 6px;
  }

  .rank .rank-reason {
    flex: 1 1 100%;
    min-width: 0;
  }

  .rank-tier .rank-row {
    grid-template-columns: 32px 72px minmax(0, 1fr);
    column-gap: 12px;
    row-gap: 8px;
    align-items: start;
  }

  .rank-tier .rank-no {
    grid-row: 1 / 3;
  }

  .rank-tier .rank-thumb {
    grid-row: 1 / 3;
  }

  .rank-tier .rank-body {
    min-width: 0;
  }
}

@media (max-width: 480px) {
  h1,
  .page-title {
    font-size: 24px;
  }

  .hero-copy h1 {
    font-size: 24px;
  }

  .header-inner {
    gap: 10px;
  }

  .brand-text {
    font-size: 15.5px;
  }

  .cover-wall,
  .week-grid,
  .cover-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .tag-list,
  .anchor-bar,
  .hero-badges,
  .tier-badges,
  .badge-legend {
    flex-wrap: nowrap;
    overflow-x: auto;
    padding-bottom: 6px;
    -webkit-overflow-scrolling: touch;
  }

  .tag-list .tag-pill,
  .anchor-bar .anchor-item,
  .anchor-bar .anchor-link {
    flex: 0 0 auto;
  }

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

  .month-card-media {
    aspect-ratio: 16 / 9;
  }

  .month-card-media img {
    height: 100%;
  }

  .feature-list .feature-body {
    padding: 16px;
  }

  .work-item {
    flex-wrap: wrap;
  }

  .work-name {
    min-width: 0;
  }

  .notice-body {
    flex-direction: column;
    align-items: flex-start;
    gap: 14px;
  }

  .notice-body .btn {
    margin-left: 0;
  }

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

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }

  .footer-slogan {
    margin-right: 0;
  }

  .rank-tier .rank-row {
    grid-template-columns: 28px 60px minmax(0, 1fr);
  }

  .rank-thumb {
    width: 60px;
    height: 80px;
  }
}

/* 动效增强：不改变初始可见性 */
@media (prefers-reduced-motion: reduce) {
  * {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}