/* ==========================================================================
   海角社区 · 全站样式
   分组：base / layout / components / pages / responsive
   ========================================================================== */

/* --------------------------------------------------------------------------
   base
   -------------------------------------------------------------------------- */
:root {
  --paper: #f3efe6;
  --ink-blue: #14313f;
  --brick: #c05a2c;
  --moss: #5b7a63;
  --text: #1c242b;
  --line: #d9d2c3;
  --hint: #fbf8f1;
  --muted: #5c666d;
  --font-serif: "Noto Serif SC", "Source Han Serif SC", Georgia, "Songti SC", serif;
  --font-sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
  --wrap: 1120px;
}

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

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

body {
  margin: 0;
  background-color: var(--paper);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
}

h1,
h2,
h3,
h4 {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 600;
  line-height: 1.35;
  color: var(--ink-blue);
}

p {
  margin: 0;
}

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

a {
  color: var(--ink-blue);
  text-decoration: none;
  transition: color 150ms ease, border-color 150ms ease;
}

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

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

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

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

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

.skip-link {
  position: absolute;
  left: 12px;
  top: -60px;
  z-index: 60;
  padding: 10px 18px;
  background-color: var(--ink-blue);
  color: #fff;
  border-radius: 4px;
  transition: top 150ms ease;
}

.skip-link:focus {
  top: 12px;
  color: #fff;
}

/* --------------------------------------------------------------------------
   layout · 全站骨架
   -------------------------------------------------------------------------- */
.site-body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.site-header {
  background-color: var(--ink-blue);
  color: #f3efe6;
  border-bottom: 1px solid rgba(243, 239, 230, 0.16);
  position: sticky;
  top: 0;
  z-index: 40;
}

.header-inner {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 24px;
  min-height: 68px;
  display: flex;
  align-items: center;
  gap: 28px;
}

.site-brand {
  display: flex;
  flex-direction: column;
  gap: 2px;
  color: #f3efe6;
  flex-shrink: 0;
}

.site-brand:hover,
.site-brand:focus-visible {
  color: #f3efe6;
}

.brand-name {
  font-family: var(--font-serif);
  font-size: 21px;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: 0;
}

.brand-slogan {
  font-size: 11px;
  line-height: 1.4;
  color: rgba(243, 239, 230, 0.66);
}

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

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

.nav-item a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 12px;
  font-size: 15px;
  color: rgba(243, 239, 230, 0.82);
  border-bottom: 2px solid transparent;
}

.nav-item a:hover,
.nav-item a:focus-visible {
  color: #fff;
  border-bottom-color: rgba(192, 90, 44, 0.7);
}

.nav-item.is-current a {
  color: #fff;
  border-bottom-color: var(--brick);
}

.header-feedback {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 14px;
  font-size: 14px;
  color: rgba(243, 239, 230, 0.86);
  border: 1px solid rgba(243, 239, 230, 0.32);
  border-radius: 4px;
  flex-shrink: 0;
}

.header-feedback:hover,
.header-feedback:focus-visible {
  color: #fff;
  border-color: var(--brick);
}

.menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 0;
  margin-left: auto;
  background: transparent;
  border: 1px solid rgba(243, 239, 230, 0.32);
  border-radius: 4px;
}

.menu-bar {
  display: block;
  width: 20px;
  height: 2px;
  margin: 0 auto;
  background-color: #f3efe6;
}

.mobile-nav {
  border-top: 1px solid rgba(243, 239, 230, 0.16);
  background-color: var(--ink-blue);
}

.mobile-nav[hidden] {
  display: none;
}

.mobile-nav-list {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 8px 24px 18px;
  display: flex;
  flex-direction: column;
}

.mobile-nav-list a {
  display: flex;
  align-items: center;
  min-height: 44px;
  font-size: 15px;
  color: rgba(243, 239, 230, 0.86);
  border-bottom: 1px solid rgba(243, 239, 230, 0.12);
}

.mobile-nav-list a:hover,
.mobile-nav-list a:focus-visible {
  color: #fff;
}

.site-main {
  flex: 1 0 auto;
  width: 100%;
}

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

.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  padding: 22px 0 0;
  font-size: 13px;
  color: var(--muted);
}

.breadcrumb a {
  color: var(--muted);
  border-bottom: 1px solid transparent;
}

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

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

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

.page-header {
  padding: 18px 0 0;
}

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

.page-lead {
  margin-top: 14px;
  max-width: 40em;
  font-size: 16px;
  color: var(--text);
}

.page-meta {
  margin-top: 10px;
  display: flex;
  flex-wrap: wrap;
  gap: 6px 18px;
  font-size: 13px;
  color: var(--muted);
}

.meta-item {
  display: inline-block;
}

.page-title,
.page-lead,
.page-meta {
  overflow-wrap: break-word;
}

.page-title + .page-lead {
  margin-top: 14px;
}

.site-footer {
  background-color: var(--ink-blue);
  color: rgba(243, 239, 230, 0.78);
  margin-top: 0;
}

.footer-inner {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 48px 24px 32px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 32px 48px;
}

.footer-title {
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 600;
  color: #f3efe6;
  margin-bottom: 12px;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.footer-links a {
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  font-size: 14px;
  color: rgba(243, 239, 230, 0.72);
}

.footer-links a:hover,
.footer-links a:focus-visible {
  color: #fff;
}

.footer-bottom {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 18px 24px 28px;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px 24px;
  border-top: 1px solid rgba(243, 239, 230, 0.16);
  font-size: 13px;
}

.footer-brand {
  color: #f3efe6;
  font-weight: 600;
}

.footer-note {
  color: rgba(243, 239, 230, 0.6);
}

/* 双列页面骨架：主内容在前，aside 在后 */
.page-layout {
  display: grid;
  grid-template-columns: minmax(0, 720px) minmax(0, 340px);
  gap: 60px;
  align-items: start;
}

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

.sidebar {
  min-width: 0;
}

.layout-shell {
  display: block;
}

/* --------------------------------------------------------------------------
   components · 通用
   -------------------------------------------------------------------------- */
.section-title {
  font-size: 24px;
  font-weight: 700;
  color: var(--ink-blue);
}

.section-lead,
.section-desc,
.section-intro,
.section-note {
  margin-top: 10px;
  max-width: 42em;
  font-size: 15px;
  color: var(--muted);
}

.section-note {
  font-size: 14px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 22px;
  font-size: 15px;
  font-weight: 600;
  border-radius: 4px;
  border: 1px solid transparent;
  transition: background-color 150ms ease, color 150ms ease, border-color 150ms ease;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 22px;
  font-size: 15px;
  font-weight: 600;
  border-radius: 4px;
  background-color: var(--brick);
  color: #fdf8f1;
  border: 1px solid var(--brick);
}

.btn-primary:hover,
.btn-primary:focus-visible {
  background-color: #a94a22;
  border-color: #a94a22;
  color: #fff;
}

.btn-ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 22px;
  font-size: 15px;
  font-weight: 600;
  border-radius: 4px;
  background-color: transparent;
  color: var(--ink-blue);
  border: 1px solid var(--ink-blue);
}

.btn-ghost:hover,
.btn-ghost:focus-visible {
  background-color: var(--ink-blue);
  color: #f3efe6;
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 22px;
  font-size: 15px;
  font-weight: 600;
  border-radius: 4px;
  background-color: transparent;
  color: var(--ink-blue);
  border: 1px solid var(--line);
}

.btn-secondary:hover,
.btn-secondary:focus-visible {
  border-color: var(--ink-blue);
}

.more-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  margin-top: 18px;
  font-size: 14px;
  font-weight: 600;
  color: var(--brick);
  border-bottom: 1px solid rgba(192, 90, 44, 0.4);
}

.more-link:hover,
.more-link:focus-visible {
  color: var(--ink-blue);
  border-bottom-color: var(--ink-blue);
}

.table-scroll {
  width: 100%;
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 6px;
  background-color: var(--hint);
}

/* 图片容器统一约束 */
.hero-figure,
.content-media,
.content-figure,
.rule-figure,
.step-figure,
.browse-note-figure,
.positioning-figure {
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 6px;
  background-color: var(--hint);
}

.hero-figure img,
.content-media img,
.content-figure img,
.rule-figure img,
.step-figure img,
.browse-note-figure img,
.positioning-figure img {
  width: 100%;
  height: auto;
  object-fit: cover;
}

figcaption,
.figure-caption {
  padding: 10px 14px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
  border-top: 1px solid var(--line);
}

/* 标签 */
.tag {
  display: inline-flex;
  align-items: center;
  padding: 1px 8px;
  font-size: 12px;
  line-height: 1.7;
  color: var(--moss);
  background-color: rgba(91, 122, 99, 0.1);
  border: 1px solid rgba(91, 122, 99, 0.4);
  border-radius: 3px;
}

.tag-pinned {
  color: var(--brick);
  background-color: rgba(192, 90, 44, 0.08);
  border-color: rgba(192, 90, 44, 0.45);
}

.tag-solved {
  color: var(--ink-blue);
  background-color: rgba(20, 49, 63, 0.06);
  border-color: rgba(20, 49, 63, 0.28);
}

.tag-status {
  color: var(--muted);
  background-color: transparent;
  border-color: var(--line);
}

/* 日期轨道帖子条目（首页与热帖流共用结构） */
.timeline-list {
  margin-top: 22px;
  border-top: 1px solid var(--line);
}

.timeline-item {
  display: grid;
  grid-template-columns: 140px minmax(0, 1fr);
  gap: 20px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}

.timeline-meta {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 13px;
  color: var(--muted);
}

.timeline-meta time,
.timeline-date {
  font-family: var(--font-serif);
  font-size: 14px;
  color: var(--ink-blue);
}

.timeline-board {
  display: inline-block;
  font-size: 12px;
  color: var(--moss);
}

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

.timeline-title {
  display: inline;
  font-family: var(--font-serif);
  font-size: 17px;
  font-weight: 600;
  color: var(--ink-blue);
  border-bottom: 1px solid transparent;
}

.timeline-item:hover .timeline-title,
.timeline-title:focus-visible {
  color: var(--brick);
  border-bottom-color: var(--brick);
}

.timeline-excerpt {
  margin-top: 6px;
  font-size: 14px;
  color: var(--muted);
}

.timeline-tags {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 8px;
  margin-top: 8px;
}

.timeline-reply-link {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  font-size: 13px;
  color: var(--brick);
}

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

.timeline-item.is-pinned .timeline-title {
  color: var(--brick);
}

/* 相关页面列表 */
.related-links {
  margin-top: 56px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
}

.related-title {
  font-size: 18px;
  margin-bottom: 14px;
}

.related-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 10px 24px;
}

.related-item a {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 10px 0;
  border-bottom: 1px solid var(--line);
  font-size: 15px;
  color: var(--ink-blue);
}

.related-item a:hover,
.related-item a:focus-visible {
  color: var(--brick);
  border-bottom-color: var(--brick);
}

.related-label {
  font-size: 12px;
  color: var(--muted);
}

.related-desc {
  font-size: 13px;
  color: var(--muted);
}

/* 折叠问答 */
.faq-item {
  border-bottom: 1px solid var(--line);
}

.faq-question {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 52px;
  padding: 12px 0;
  font-family: var(--font-serif);
  font-size: 17px;
  font-weight: 600;
  color: var(--ink-blue);
  cursor: pointer;
  list-style: none;
}

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

.faq-question::before {
  content: "+";
  flex-shrink: 0;
  width: 20px;
  font-family: var(--font-sans);
  font-size: 18px;
  color: var(--brick);
}

.faq-item[open] .faq-question::before {
  content: "−";
}

.faq-item[open] .faq-question {
  color: var(--brick);
}

.faq-answer {
  padding: 0 0 18px 30px;
  font-size: 15px;
  color: var(--text);
}

/* 返回主站 */
.back-to-home {
  margin-top: 40px;
  padding: 20px 22px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--brick);
  border-radius: 4px;
  background-color: var(--hint);
}

.back-to-home h2 {
  font-size: 17px;
  margin-bottom: 6px;
}

.back-to-home p {
  font-size: 14px;
  color: var(--muted);
}

.back-home-link,
.back-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  margin-top: 6px;
  font-size: 14px;
  font-weight: 600;
  color: var(--brick);
  border-bottom: 1px solid rgba(192, 90, 44, 0.4);
}

.back-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 24px;
}

.back-home-link:hover,
.back-link:hover,
.back-home-link:focus-visible,
.back-link:focus-visible {
  color: var(--ink-blue);
  border-bottom-color: var(--ink-blue);
}

/* --------------------------------------------------------------------------
   pages · 首页
   -------------------------------------------------------------------------- */
.home-main {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 24px 80px;
}

.hero-section {
  display: grid;
  grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  gap: 48px;
  align-items: start;
  padding: 44px 0 8px;
}

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

.hero-text h1 {
  font-size: 40px;
  font-weight: 700;
  color: var(--ink-blue);
  overflow-wrap: break-word;
}

.hero-lead {
  margin-top: 16px;
  max-width: 34em;
  font-size: 17px;
  color: var(--text);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.hero-points {
  margin-top: 26px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.hero-points li {
  position: relative;
  padding-left: 20px;
  font-size: 14px;
  color: var(--muted);
}

.hero-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 8px;
  height: 1px;
  background-color: var(--brick);
}

.hero-figure img {
  aspect-ratio: 4 / 3;
}

.content-media {
  margin-top: 20px;
}

.content-media-primary img {
  aspect-ratio: 16 / 9;
}

/* 公告与版块快捷入口 */
.notice-shortcuts {
  margin-top: 56px;
}

.notice-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 16px;
  margin-top: 16px;
  padding: 12px 16px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--moss);
  border-radius: 4px;
  background-color: var(--hint);
}

.notice-tag {
  flex-shrink: 0;
  padding: 1px 8px;
  font-size: 12px;
  color: var(--moss);
  border: 1px solid rgba(91, 122, 99, 0.5);
  border-radius: 3px;
}

.notice-text {
  flex: 1 1 260px;
  min-width: 0;
  font-size: 14px;
  color: var(--text);
}

.notice-date {
  flex-shrink: 0;
  font-size: 12px;
  color: var(--muted);
}

.shortcut-cards {
  margin-top: 16px;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.shortcut-card a {
  display: flex;
  flex-direction: column;
  gap: 6px;
  height: 100%;
  min-height: 96px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background-color: #faf7ef;
}

.shortcut-card a:hover,
.shortcut-card a:focus-visible {
  border-color: var(--brick);
  color: var(--ink-blue);
}

.shortcut-name {
  font-family: var(--font-serif);
  font-size: 17px;
  font-weight: 600;
  color: var(--ink-blue);
}

.shortcut-desc {
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

/* 首页双列主体 */
.home-body-layout {
  margin-top: 56px;
}

.post-timeline .section-lead {
  margin-top: 8px;
}

.home-sidebar {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.sidebar-block {
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background-color: var(--hint);
}

.sidebar-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--ink-blue);
}

.sidebar-link-list {
  margin-top: 12px;
  display: flex;
  flex-direction: column;
}

.sidebar-link-list a {
  display: flex;
  align-items: center;
  min-height: 40px;
  font-size: 15px;
  color: var(--ink-blue);
  border-bottom: 1px solid var(--line);
}

.sidebar-link-list li:last-child a {
  border-bottom: 0;
}

.sidebar-link-list a:hover,
.sidebar-link-list a:focus-visible {
  color: var(--brick);
}

.sidebar-more a {
  color: var(--brick);
}

.sidebar-steps {
  margin-top: 12px;
  counter-reset: sidebar-step;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.sidebar-steps li {
  position: relative;
  padding-left: 30px;
  font-size: 14px;
  color: var(--text);
  counter-increment: sidebar-step;
}

.sidebar-steps li::before {
  content: counter(sidebar-step);
  position: absolute;
  left: 0;
  top: 2px;
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-serif);
  font-size: 12px;
  color: var(--brick);
  border: 1px solid rgba(192, 90, 44, 0.5);
  border-radius: 3px;
}

/* 话题版块索引 */
.board-groups {
  margin-top: 56px;
}

.board-group-grid {
  margin-top: 22px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 28px 40px;
}

.board-group {
  min-width: 0;
  padding-top: 16px;
  border-top: 2px solid var(--ink-blue);
}

.group-title {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-size: 18px;
  color: var(--ink-blue);
}

.group-index {
  font-family: var(--font-serif);
  font-size: 13px;
  font-weight: 600;
  color: var(--brick);
}

.group-items {
  margin-top: 12px;
  display: flex;
  flex-direction: column;
}

.group-items li {
  padding: 10px 0;
  border-bottom: 1px solid var(--line);
}

.group-items a {
  display: inline-block;
  font-family: var(--font-serif);
  font-size: 15px;
  font-weight: 600;
  color: var(--ink-blue);
  border-bottom: 1px solid transparent;
}

.group-items a:hover,
.group-items a:focus-visible {
  color: var(--brick);
  border-bottom-color: var(--brick);
}

.group-items p {
  margin-top: 2px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

/* 版块结构一览表 */
.structure-section {
  margin-top: 56px;
}

.structure-conclusion {
  margin-top: 14px;
  padding: 12px 16px;
  font-size: 15px;
  color: var(--ink-blue);
  border-left: 3px solid var(--brick);
  background-color: var(--hint);
  border-radius: 0 4px 4px 0;
}

.structure-section .table-scroll {
  margin-top: 16px;
}

.structure-table {
  min-width: 640px;
  font-size: 14px;
}

.structure-table caption {
  padding: 10px 14px;
  font-size: 13px;
  text-align: left;
  color: var(--muted);
  border-bottom: 1px solid var(--line);
}

.structure-table th,
.structure-table td {
  padding: 10px 14px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--line);
}

.structure-table thead th {
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 600;
  color: var(--ink-blue);
  background-color: rgba(20, 49, 63, 0.05);
  white-space: nowrap;
}

.structure-table tbody th {
  font-family: var(--font-serif);
  font-weight: 600;
  color: var(--ink-blue);
  white-space: nowrap;
}

.structure-table tbody tr:last-child th,
.structure-table tbody tr:last-child td {
  border-bottom: 0;
}

.structure-note {
  margin-top: 12px;
  font-size: 13px;
  color: var(--muted);
}

/* 参与讨论三步 */
.participation-steps {
  margin-top: 56px;
}

.step-cards {
  margin-top: 22px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.step-card {
  min-width: 0;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background-color: #faf7ef;
}

.participation-steps .step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  font-family: var(--font-serif);
  font-size: 13px;
  font-weight: 600;
  color: var(--brick);
  border: 1px solid rgba(192, 90, 44, 0.5);
  border-radius: 3px;
}

.participation-steps .step-title {
  margin-top: 10px;
  font-size: 17px;
  color: var(--ink-blue);
}

.step-label {
  display: block;
  margin-top: 10px;
  font-size: 12px;
  font-weight: 600;
  color: var(--moss);
}

.participation-steps .step-action {
  margin-top: 2px;
  font-size: 14px;
  color: var(--text);
}

.participation-steps .step-result {
  margin-top: 8px;
  font-size: 13px;
  color: var(--muted);
}

/* 规则摘要 */
.rules-summary {
  margin-top: 56px;
}

.rules-list {
  margin-top: 20px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 32px;
}

.rules-list li {
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background-color: var(--hint);
}

.rule-title {
  font-size: 16px;
  color: var(--ink-blue);
}

.rules-list p {
  margin-top: 6px;
  font-size: 14px;
  color: var(--muted);
}

/* 站点说明短块 */
.about-strip {
  margin-top: 56px;
  padding: 26px 28px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background-color: #faf7ef;
}

.about-strip-body {
  margin-top: 12px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 40px;
}

.about-strip-body p {
  font-size: 15px;
  color: var(--text);
}

.about-strip-body a {
  font-weight: 600;
  color: var(--brick);
  border-bottom: 1px solid rgba(192, 90, 44, 0.4);
}

.about-strip-body a:hover,
.about-strip-body a:focus-visible {
  color: var(--ink-blue);
  border-bottom-color: var(--ink-blue);
}

/* --------------------------------------------------------------------------
   pages · 版块目录
   -------------------------------------------------------------------------- */
.page-shell {
  max-width: 880px;
}

.board-section {
  margin-top: 40px;
}

.board-tabs {
  display: flex;
  gap: 8px;
  margin-top: 16px;
  padding-bottom: 2px;
  border-bottom: 1px solid var(--line);
  overflow-x: auto;
}

.board-tab {
  flex-shrink: 0;
  min-height: 44px;
  padding: 0 18px;
  font-size: 15px;
  color: var(--muted);
  background-color: transparent;
  border: 1px solid transparent;
  border-bottom: 2px solid transparent;
  border-radius: 4px 4px 0 0;
}

.board-tab:hover {
  color: var(--ink-blue);
}

.board-tab.is-active {
  color: var(--ink-blue);
  font-weight: 600;
  border-bottom-color: var(--brick);
  background-color: var(--hint);
}

.board-panels {
  margin-top: 22px;
}

.board-panel[hidden] {
  display: none;
}

.panel-title {
  font-size: 20px;
  color: var(--ink-blue);
}

.panel-desc {
  margin-top: 6px;
  font-size: 14px;
  color: var(--muted);
}

.board-list {
  margin-top: 16px;
  border-top: 1px solid var(--line);
}

.board-row {
  display: grid;
  grid-template-columns: minmax(0, 180px) minmax(0, 1fr) minmax(0, 220px);
  gap: 8px 24px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

.board-name {
  font-family: var(--font-serif);
  font-size: 16px;
  font-weight: 600;
  color: var(--ink-blue);
}

.board-scope {
  font-size: 14px;
  color: var(--text);
}

.board-rule {
  font-size: 13px;
  color: var(--muted);
}

.belonging-section,
.figure-section,
.mistake-section {
  margin-top: 48px;
}

.belonging-list {
  margin-top: 18px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.belonging-item {
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background-color: var(--hint);
}

.belonging-title {
  font-size: 16px;
  color: var(--ink-blue);
}

.belonging-text {
  margin-top: 6px;
  font-size: 14px;
  color: var(--muted);
}

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

.mistake-list {
  margin-top: 18px;
  counter-reset: mistake;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.mistake-item {
  position: relative;
  padding-left: 44px;
  counter-increment: mistake;
}

.mistake-item::before {
  content: counter(mistake);
  position: absolute;
  left: 0;
  top: 2px;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-serif);
  font-size: 13px;
  color: var(--brick);
  border: 1px solid rgba(192, 90, 44, 0.5);
  border-radius: 3px;
}

.mistake-title {
  font-size: 16px;
  color: var(--ink-blue);
}

.mistake-text {
  margin-top: 4px;
  font-size: 14px;
  color: var(--muted);
}

/* --------------------------------------------------------------------------
   pages · 热帖流
   -------------------------------------------------------------------------- */
.browse-note {
  margin-top: 36px;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background-color: var(--hint);
}

.browse-note-grid {
  margin-top: 14px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 300px);
  gap: 24px;
  align-items: start;
}

.browse-note-text p {
  font-size: 15px;
  color: var(--text);
}

.browse-note-text p + p {
  margin-top: 8px;
}

.browse-note-figure img {
  aspect-ratio: 4 / 3;
}

.topics-layout {
  margin-top: 44px;
}

.post-timeline .section-note {
  margin-top: 6px;
}

.aside-block {
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background-color: var(--hint);
}

.aside-block + .aside-block {
  margin-top: 20px;
}

.aside-title {
  font-size: 17px;
  color: var(--ink-blue);
}

.aside-note {
  margin-top: 6px;
  font-size: 13px;
  color: var(--muted);
}

.aside-link-list {
  margin-top: 12px;
  display: flex;
  flex-direction: column;
}

.aside-link-list li {
  border-bottom: 1px solid var(--line);
}

.aside-link-list li:last-child {
  border-bottom: 0;
}

.aside-link-list a {
  display: flex;
  align-items: center;
  min-height: 44px;
  font-size: 15px;
  color: var(--ink-blue);
}

.aside-link-list a:hover,
.aside-link-list a:focus-visible {
  color: var(--brick);
}

.aside-link-hint {
  display: block;
  padding-bottom: 8px;
  font-size: 12px;
  color: var(--muted);
}

.status-legend-list {
  margin: 12px 0 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.status-legend-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.status-legend-item dt {
  font-family: var(--font-serif);
  font-size: 15px;
  font-weight: 600;
  color: var(--ink-blue);
}

.status-legend-item dd {
  margin: 0;
  font-size: 13px;
  color: var(--muted);
}

.pager-links {
  margin-top: 40px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.pager-link {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-height: 68px;
  padding: 14px 18px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background-color: #faf7ef;
}

.pager-link:hover,
.pager-link:focus-visible {
  border-color: var(--brick);
  color: var(--ink-blue);
}

.pager-next {
  text-align: right;
}

.pager-label {
  font-size: 12px;
  color: var(--muted);
}

.pager-title {
  font-family: var(--font-serif);
  font-size: 16px;
  font-weight: 600;
  color: var(--ink-blue);
}

.related-links-label {
  display: block;
  margin-bottom: 8px;
  font-size: 13px;
  color: var(--muted);
}

.related-links-item {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  margin-right: 22px;
  font-size: 14px;
  color: var(--brick);
  border-bottom: 1px solid rgba(192, 90, 44, 0.4);
}

.related-links-item:hover,
.related-links-item:focus-visible {
  color: var(--ink-blue);
  border-bottom-color: var(--ink-blue);
}

/* --------------------------------------------------------------------------
   pages · 社区规则
   -------------------------------------------------------------------------- */
.rules-layout {
  margin-top: 36px;
  max-width: 820px;
}

.summary-card {
  padding: 22px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--brick);
  border-radius: 4px;
  background-color: var(--hint);
}

.summary-card h2 {
  font-size: 19px;
  color: var(--ink-blue);
}

.summary-card p {
  margin-top: 8px;
  font-size: 15px;
  color: var(--text);
}

.summary-points {
  margin-top: 14px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.summary-points li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  color: var(--muted);
}

.summary-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 8px;
  height: 1px;
  background-color: var(--brick);
}

.anchor-toc {
  margin-top: 24px;
  padding: 12px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  overflow-x: auto;
}

.anchor-toc-list {
  display: flex;
  flex-wrap: nowrap;
  gap: 6px 20px;
}

.anchor-toc-list a {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  font-size: 14px;
  white-space: nowrap;
  color: var(--ink-blue);
  border-bottom: 1px solid transparent;
}

.anchor-toc-list a:hover,
.anchor-toc-list a:focus-visible {
  color: var(--brick);
  border-bottom-color: var(--brick);
}

.rule-groups {
  margin-top: 36px;
}

.rule-groups > h2 {
  font-size: 24px;
  color: var(--ink-blue);
}

.rule-figure {
  margin-top: 18px;
}

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

.rule-group {
  margin-top: 28px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.rule-group h3 {
  font-size: 18px;
  color: var(--ink-blue);
}

.rule-list {
  margin-top: 10px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.rule-list li {
  position: relative;
  padding-left: 18px;
  font-size: 15px;
  color: var(--text);
}

.rule-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 8px;
  height: 1px;
  background-color: var(--line);
}

.handling-flow {
  margin-top: 44px;
}

.handling-flow > h2 {
  font-size: 24px;
  color: var(--ink-blue);
}

.flow-steps {
  margin-top: 20px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.flow-step {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background-color: #faf7ef;
}

.flow-step h3 {
  font-size: 16px;
  color: var(--ink-blue);
}

.flow-trigger,
.flow-action,
.flow-result {
  margin-top: 6px;
  font-size: 13px;
  line-height: 1.65;
}

.flow-trigger {
  color: var(--moss);
}

.flow-action {
  color: var(--text);
}

.flow-result {
  color: var(--muted);
}

.appeal-note {
  margin-top: 40px;
  padding: 20px 22px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background-color: var(--hint);
}

.appeal-note h2 {
  font-size: 20px;
  color: var(--ink-blue);
}

.appeal-note p {
  margin-top: 8px;
  font-size: 15px;
  color: var(--text);
}

.appeal-link a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  font-weight: 600;
  color: var(--brick);
  border-bottom: 1px solid rgba(192, 90, 44, 0.4);
}

.appeal-link a:hover,
.appeal-link a:focus-visible {
  color: var(--ink-blue);
  border-bottom-color: var(--ink-blue);
}

/* --------------------------------------------------------------------------
   pages · 上手指引
   -------------------------------------------------------------------------- */
.reading-order {
  margin-top: 34px;
  padding: 20px 22px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--moss);
  border-radius: 4px;
  background-color: var(--hint);
}

.reading-order h2 {
  font-size: 19px;
  color: var(--ink-blue);
}

.reading-order-text {
  margin-top: 8px;
  font-size: 15px;
  color: var(--text);
}

.reading-order-text a {
  color: var(--brick);
  border-bottom: 1px solid rgba(192, 90, 44, 0.4);
}

.reading-order-text a:hover,
.reading-order-text a:focus-visible {
  color: var(--ink-blue);
  border-bottom-color: var(--ink-blue);
}

.reading-order-links {
  margin-top: 12px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
}

.reading-order-links a {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  font-size: 14px;
  font-weight: 600;
  color: var(--ink-blue);
  border-bottom: 1px solid var(--line);
}

.reading-order-links a:hover,
.reading-order-links a:focus-visible {
  color: var(--brick);
  border-bottom-color: var(--brick);
}

.step-section {
  margin-top: 44px;
}

.step-figure {
  margin-top: 18px;
}

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

.step-list {
  margin-top: 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.step-list .step-card {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  grid-template-areas:
    "index name"
    "index action"
    "index result"
    "index pitfall";
  gap: 4px 16px;
  padding: 18px 20px;
}

.step-list .step-index {
  grid-area: index;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  font-family: var(--font-serif);
  font-size: 15px;
  font-weight: 600;
  color: var(--brick);
  border: 1px solid rgba(192, 90, 44, 0.5);
  border-radius: 4px;
}

.step-list .step-name {
  grid-area: name;
  font-size: 17px;
  color: var(--ink-blue);
}

.step-list .step-action {
  grid-area: action;
  font-size: 14px;
  color: var(--text);
}

.step-list .step-result {
  grid-area: result;
  font-size: 13px;
  color: var(--muted);
}

.step-list .step-pitfall {
  grid-area: pitfall;
  margin-top: 4px;
  padding-top: 6px;
  font-size: 13px;
  color: var(--moss);
  border-top: 1px dashed var(--line);
}

.starter-topics {
  margin-top: 48px;
}

.starter-list {
  margin-top: 18px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.starter-item {
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background-color: var(--hint);
}

.starter-name {
  font-size: 16px;
  color: var(--ink-blue);
}

.starter-board {
  margin-top: 4px;
  font-size: 13px;
  color: var(--moss);
}

.starter-hint {
  margin-top: 6px;
  font-size: 14px;
  color: var(--muted);
}

.stuck-points {
  margin-top: 48px;
}

.stuck-points .faq-item:first-of-type {
  margin-top: 16px;
  border-top: 1px solid var(--line);
}

.related-prev,
.related-next {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 18px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background-color: #faf7ef;
}

.related-prev:hover,
.related-next:hover,
.related-prev:focus-visible,
.related-next:focus-visible {
  border-color: var(--brick);
  color: var(--ink-blue);
}

.related-next {
  text-align: right;
}

.related-title {
  font-family: var(--font-serif);
  font-size: 16px;
  font-weight: 600;
  color: var(--ink-blue);
}

/* --------------------------------------------------------------------------
   pages · 反馈与申诉
   -------------------------------------------------------------------------- */
.issue-summary {
  padding: 20px 22px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--brick);
  border-radius: 4px;
  background-color: var(--hint);
}

.issue-summary h2 {
  font-size: 19px;
  color: var(--ink-blue);
}

.conclusion-sentence {
  margin-top: 8px;
  font-size: 15px;
  color: var(--text);
}

.feedback-types {
  margin-top: 40px;
}

.feedback-types > h2 {
  font-size: 24px;
  color: var(--ink-blue);
}

.feedback-types .content-figure {
  margin-top: 18px;
}

.feedback-types .content-figure img {
  aspect-ratio: 16 / 9;
}

.feedback-item {
  margin-top: 24px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.feedback-item h3 {
  font-size: 18px;
  color: var(--ink-blue);
}

.feedback-detail {
  margin: 10px 0 0;
  display: grid;
  grid-template-columns: minmax(0, 120px) minmax(0, 1fr);
  gap: 8px 20px;
}

.feedback-detail dt {
  font-size: 13px;
  font-weight: 600;
  color: var(--moss);
}

.feedback-detail dd {
  margin: 0;
  font-size: 14px;
  color: var(--text);
}

.handling-order {
  margin-top: 44px;
}

.handling-order > h2 {
  font-size: 24px;
  color: var(--ink-blue);
}

.order-steps {
  margin-top: 20px;
  counter-reset: order-step;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.order-step {
  position: relative;
  padding: 16px 18px 16px 56px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background-color: #faf7ef;
  counter-increment: order-step;
}

.order-step::before {
  content: counter(order-step);
  position: absolute;
  left: 16px;
  top: 16px;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-serif);
  font-size: 13px;
  color: var(--brick);
  border: 1px solid rgba(192, 90, 44, 0.5);
  border-radius: 3px;
}

.order-step h3 {
  font-size: 16px;
  color: var(--ink-blue);
}

.order-step p {
  margin-top: 4px;
  font-size: 14px;
  color: var(--text);
}

.order-reply {
  color: var(--muted);
  font-size: 13px;
}

.check-list {
  margin-top: 12px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.check-list li {
  position: relative;
  padding-left: 20px;
  font-size: 14px;
  color: var(--text);
}

.check-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 8px;
  height: 1px;
  background-color: var(--brick);
}

.aside-related-rules .aside-link-list a {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  align-items: flex-start;
  gap: 2px;
  padding: 8px 0;
}

.link-note {
  font-size: 12px;
  color: var(--muted);
}

/* --------------------------------------------------------------------------
   pages · 站点说明
   -------------------------------------------------------------------------- */
.about-positioning {
  margin-top: 32px;
}

.about-positioning h2 {
  font-size: 24px;
  color: var(--ink-blue);
}

.positioning-figure {
  margin-top: 18px;
}

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

.about-positioning p {
  margin-top: 14px;
  font-size: 15px;
  color: var(--text);
}

.about-organization,
.about-moderation,
.about-boundary,
.about-terminology {
  margin-top: 44px;
}

.about-organization h2,
.about-moderation h2,
.about-boundary h2,
.about-terminology h2 {
  font-size: 24px;
  color: var(--ink-blue);
}

.organization-list {
  margin-top: 18px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 28px;
}

.organization-item {
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background-color: var(--hint);
}

.organization-item h3 {
  font-size: 16px;
  color: var(--ink-blue);
}

.organization-item p {
  margin-top: 6px;
  font-size: 14px;
  color: var(--muted);
}

.duty-list {
  margin-top: 18px;
  counter-reset: duty;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.duty-item {
  position: relative;
  padding: 14px 18px 14px 56px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background-color: #faf7ef;
  counter-increment: duty;
}

.duty-index {
  position: absolute;
  left: 16px;
  top: 14px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  font-family: var(--font-serif);
  font-size: 13px;
  font-weight: 600;
  color: var(--brick);
  border: 1px solid rgba(192, 90, 44, 0.5);
  border-radius: 3px;
}

.duty-item h3 {
  font-size: 16px;
  color: var(--ink-blue);
}

.duty-item p {
  margin-top: 4px;
  font-size: 14px;
  color: var(--muted);
}

.about-moderation .section-note a {
  color: var(--brick);
  border-bottom: 1px solid rgba(192, 90, 44, 0.4);
}

.about-moderation .section-note a:hover,
.about-moderation .section-note a:focus-visible {
  color: var(--ink-blue);
  border-bottom-color: var(--ink-blue);
}

.boundary-list {
  margin-top: 18px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px 28px;
}

.boundary-item {
  padding-left: 18px;
  border-left: 2px solid var(--line);
}

.boundary-item h3 {
  font-size: 15px;
  color: var(--ink-blue);
}

.boundary-item p {
  margin-top: 4px;
  font-size: 14px;
  color: var(--muted);
}

.about-terminology .table-scroll {
  margin-top: 18px;
}

.terminology-table {
  min-width: 520px;
  font-size: 14px;
}

.terminology-table caption {
  padding: 10px 14px;
  font-size: 13px;
  text-align: left;
  color: var(--muted);
  border-bottom: 1px solid var(--line);
}

.terminology-table th,
.terminology-table td {
  padding: 10px 14px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--line);
}

.terminology-table thead th {
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 600;
  color: var(--ink-blue);
  background-color: rgba(20, 49, 63, 0.05);
}

.terminology-table tbody th {
  font-family: var(--font-serif);
  font-weight: 600;
  color: var(--ink-blue);
  white-space: nowrap;
}

.terminology-table tbody tr:last-child th,
.terminology-table tbody tr:last-child td {
  border-bottom: 0;
}

/* --------------------------------------------------------------------------
   pages · 404
   -------------------------------------------------------------------------- */
.error-main {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 64px 24px 80px;
}

.error-panel {
  max-width: 620px;
  padding: 32px;
  border: 1px solid var(--line);
  border-top: 3px solid var(--brick);
  border-radius: 6px;
  background-color: var(--hint);
}

.error-code {
  font-family: var(--font-serif);
  font-size: 44px;
  font-weight: 700;
  line-height: 1;
  color: var(--brick);
}

.error-panel h1 {
  margin-top: 12px;
  font-size: 28px;
  color: var(--ink-blue);
}

.error-lead {
  margin-top: 10px;
  font-size: 15px;
  color: var(--text);
}

.error-reasons {
  margin-top: 18px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.error-reasons li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  color: var(--muted);
}

.error-reasons li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 8px;
  height: 1px;
  background-color: var(--line);
}

.error-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.error-hints {
  margin-top: 44px;
  max-width: 720px;
}

.error-hints h2 {
  font-size: 20px;
  color: var(--ink-blue);
}

.hint-list {
  margin-top: 14px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 10px 20px;
}

.hint-list a {
  display: flex;
  align-items: center;
  min-height: 44px;
  padding: 8px 14px;
  font-size: 14px;
  color: var(--ink-blue);
  border: 1px solid var(--line);
  border-radius: 4px;
  background-color: #faf7ef;
}

.hint-list a:hover,
.hint-list a:focus-visible {
  border-color: var(--brick);
  color: var(--brick);
}

/* --------------------------------------------------------------------------
   responsive
   -------------------------------------------------------------------------- */
@media (max-width: 1024px) {
  .header-inner {
    gap: 18px;
  }

  .nav-item a {
    padding: 0 9px;
    font-size: 14px;
  }

  .hero-section {
    gap: 32px;
  }

  .hero-text h1 {
    font-size: 34px;
  }

  .page-layout {
    grid-template-columns: minmax(0, 1fr) minmax(0, 300px);
    gap: 40px;
  }

  .board-row {
    grid-template-columns: minmax(0, 150px) minmax(0, 1fr);
  }

  .board-rule {
    grid-column: 2;
  }
}

@media (max-width: 860px) {
  .site-nav {
    display: none;
  }

  .header-feedback {
    display: none;
  }

  .menu-toggle {
    display: flex;
  }

  .hero-section {
    grid-template-columns: minmax(0, 1fr);
    gap: 28px;
    padding-top: 32px;
  }

  .hero-text h1 {
    font-size: 30px;
  }

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

  .page-layout {
    grid-template-columns: minmax(0, 1fr);
    gap: 36px;
  }

  .board-group-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 24px;
  }

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

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

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

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

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

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

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

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

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

  .footer-inner {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 28px 40px;
  }
}

@media (max-width: 640px) {
  body {
    font-size: 15px;
  }

  .header-inner {
    padding: 0 16px;
    min-height: 60px;
  }

  .brand-name {
    font-size: 19px;
  }

  .mobile-nav-list {
    padding: 8px 16px 16px;
  }

  .home-main {
    padding: 0 16px 56px;
  }

  .inner-main {
    padding: 0 16px 56px;
  }

  .breadcrumb {
    padding-top: 16px;
    font-size: 12px;
  }

  .page-header {
    padding-top: 14px;
  }

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

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

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

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

  .hero-actions .btn-primary,
  .hero-actions .btn-ghost {
    flex: 1 1 auto;
  }

  .notice-shortcuts,
  .home-body-layout,
  .board-groups,
  .structure-section,
  .participation-steps,
  .rules-summary,
  .about-strip {
    margin-top: 36px;
  }

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

  .shortcut-card a {
    min-height: 0;
  }

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

  .timeline-item {
    grid-template-columns: minmax(0, 1fr);
    gap: 6px;
    padding: 16px 0;
  }

  .timeline-meta {
    flex-direction: row;
    align-items: baseline;
    gap: 10px;
  }

  .timeline-title {
    font-size: 16px;
  }

  .board-row {
    grid-template-columns: minmax(0, 1fr);
    gap: 4px;
    padding: 14px 0;
  }

  .board-rule {
    grid-column: auto;
  }

  .board-tabs {
    gap: 4px;
  }

  .board-tab {
    padding: 0 12px;
    font-size: 14px;
  }

  .step-list .step-card {
    grid-template-columns: minmax(0, 1fr);
    grid-template-areas:
      "index"
      "name"
      "action"
      "result"
      "pitfall";
    gap: 6px;
    padding: 16px;
  }

  .step-list .step-index {
    width: 30px;
    height: 30px;
    font-size: 14px;
  }

  .feedback-detail {
    grid-template-columns: minmax(0, 1fr);
    gap: 2px 0;
  }

  .feedback-detail dd {
    margin-bottom: 8px;
  }

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

  .pager-next,
  .related-next {
    text-align: left;
  }

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

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

  .error-panel {
    padding: 22px;
  }

  .error-code {
    font-size: 36px;
  }

  .error-panel h1 {
    font-size: 22px;
  }

  .error-actions .btn-primary,
  .error-actions .btn-secondary {
    flex: 1 1 auto;
  }

  .footer-inner {
    grid-template-columns: minmax(0, 1fr);
    padding: 36px 16px 24px;
    gap: 22px;
  }

  .footer-bottom {
    padding: 16px 16px 24px;
    flex-direction: column;
  }

  .flow-step,
  .order-step,
  .duty-item {
    padding-right: 16px;
  }
}

@media (max-width: 480px) {
  .hero-text h1 {
    font-size: 26px;
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .reading-order-links {
    gap: 4px 16px;
  }

  .anchor-toc-list {
    gap: 4px 16px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
  }
}