/* ==========================================================================
   海角网 全站样式表
   视觉方向：新粗野风 — 明确边框、直接排版、黑粗分隔、米白背景、墨青标题、橙黄高亮
   ========================================================================== */

/* --------------------------------------------------------------------------
   Base — 基础变量、重置、字体、颜色
   -------------------------------------------------------------------------- */
:root {
  --color-bg: #fdf8f0;
  --color-surface: #ffffff;
  --color-border: #1f2937;
  --color-text: #1f2937;
  --color-primary: #0e7490;
  --color-accent: #f59e0b;
  --color-code-bg: #eef2f5;
  --color-muted: #4b5563;
  --font-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  --container-width: 1200px;
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --space-7: 48px;
  --space-8: 64px;
  --space-9: 96px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-text);
  background-color: var(--color-bg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color 0.15s ease;
}

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

ul,
ol {
  list-style: none;
}

h1,
h2,
h3,
h4 {
  font-weight: 700;
  line-height: 1.4;
  color: var(--color-text);
}

h1 {
  font-size: 30px;
  border-bottom: 4px solid var(--color-border);
  padding-bottom: 12px;
}

h2 {
  font-size: 22px;
}

h3 {
  font-size: 18px;
}

h4 {
  font-size: 16px;
}

p {
  margin-bottom: 12px;
}

/* --------------------------------------------------------------------------
   Layout — 全站骨架：页头、页脚、主容器、面包屑
   -------------------------------------------------------------------------- */

.site-header {
  background-color: var(--color-surface);
  border-bottom: 3px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 68px;
}

.brand-logo,
.footer-logo {
  display: flex;
  flex-direction: column;
  line-height: 1.3;
}

.brand-name {
  font-size: 22px;
  font-weight: 800;
  color: var(--color-text);
  letter-spacing: 1px;
}

.brand-slogan {
  font-size: 12px;
  color: var(--color-muted);
  letter-spacing: 0.5px;
}

.site-nav .nav-list {
  display: flex;
  align-items: center;
  gap: 24px;
}

.site-nav .nav-list a {
  display: block;
  padding: 8px 4px;
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text);
  border-bottom: 2px solid transparent;
}

.site-nav .nav-list a:hover {
  color: var(--color-primary);
  border-bottom-color: var(--color-accent);
}

.site-nav .nav-list a.is-current {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
  font-weight: 700;
}

.nav-toggle {
  display: none;
  background: none;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-sm);
  width: 44px;
  height: 44px;
  cursor: pointer;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  padding: 8px;
}

.nav-toggle-line {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--color-text);
  transition: transform 0.2s ease, opacity 0.2s ease;
}

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

.inner-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 20px 64px;
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--color-muted);
  padding: 16px 0 8px;
}

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

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

.breadcrumb-sep {
  color: var(--color-border);
  font-weight: 700;
}

.breadcrumb-current {
  color: var(--color-text);
  font-weight: 600;
}

.page-header {
  padding: 8px 0 28px;
}

.page-title {
  font-size: 30px;
  font-weight: 800;
  border-bottom: 4px solid var(--color-border);
  padding-bottom: 12px;
  margin-bottom: 12px;
}

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

.site-footer {
  background-color: var(--color-surface);
  border-top: 3px solid var(--color-border);
  margin-top: auto;
}

.footer-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 40px 20px 24px;
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
  gap: 32px;
}

.footer-col h3 {
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 12px;
  padding-bottom: 6px;
  border-bottom: 2px solid var(--color-border);
}

.footer-brand .footer-logo {
  margin-bottom: 12px;
}

.footer-brand p {
  font-size: 13px;
  color: var(--color-muted);
}

.footer-links ul li {
  margin-bottom: 8px;
}

.footer-links ul a {
  font-size: 14px;
  color: var(--color-text);
}

.footer-links ul a:hover {
  color: var(--color-primary);
}

.footer-rules p {
  font-size: 13px;
  color: var(--color-muted);
  margin-bottom: 8px;
  line-height: 1.6;
}

.footer-feedback p {
  font-size: 13px;
  color: var(--color-muted);
  margin-bottom: 12px;
}

.footer-feedback a {
  display: inline-block;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
  border-radius: var(--radius-sm);
  padding: 6px 16px;
  transition: background-color 0.15s ease, color 0.15s ease;
}

.footer-feedback a:hover {
  background-color: var(--color-primary);
  color: var(--color-surface);
}

.footer-bottom {
  border-top: 2px solid var(--color-border);
  padding: 16px 20px;
  text-align: center;
}

.footer-bottom p {
  font-size: 13px;
  color: var(--color-muted);
  margin: 0;
}

/* --------------------------------------------------------------------------
   Layout — 侧栏布局体系
   -------------------------------------------------------------------------- */

.sidebar-left {
  display: grid;
  grid-template-columns: 250px 1fr;
  gap: 32px;
  align-items: start;
}

.sidebar-left .sidebar,
.sidebar-left .guide-aside,
.sidebar-left .faq-topic-nav {
  position: sticky;
  top: 88px;
  background-color: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
}

.sidebar-left .content-area,
.sidebar-left .guide-content,
.sidebar-left .faq-content,
.sidebar-left .rule-content {
  min-width: 0;
}

.sidebar-left .sidebar h2,
.sidebar-left .guide-aside h2,
.sidebar-left .faq-topic-nav h2 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--color-border);
}

.sidebar-left .sidebar ul li,
.sidebar-left .guide-aside ul li,
.sidebar-left .faq-topic-nav ul li {
  margin-bottom: 4px;
}

.sidebar-left .sidebar ul a,
.sidebar-left .guide-aside ul a,
.sidebar-left .faq-topic-nav ul a {
  display: block;
  padding: 6px 8px;
  font-size: 14px;
  color: var(--color-text);
  border-left: 3px solid transparent;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.sidebar-left .sidebar ul a:hover,
.sidebar-left .guide-aside ul a:hover,
.sidebar-left .faq-topic-nav ul a:hover {
  color: var(--color-primary);
  border-left-color: var(--color-accent);
  background-color: rgba(245, 158, 11, 0.08);
}

.sidebar-figure {
  margin-bottom: 16px;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.sidebar-figure img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.sidebar-figure figcaption {
  font-size: 12px;
  color: var(--color-muted);
  padding: 6px 10px;
  background-color: var(--color-code-bg);
  border-top: 1px solid var(--color-border);
}

/* --------------------------------------------------------------------------
   Components — 通用组件
   -------------------------------------------------------------------------- */

/* 图片卡片 */
figure {
  margin: 0;
}

/* 相关链接 */
.related-links {
  margin-top: 48px;
  padding-top: 24px;
  border-top: 2px solid var(--color-border);
}

.related-links-label,
.related-links h2,
.related-title {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 16px;
}

.related-links-item {
  display: inline-block;
  margin-right: 16px;
  margin-bottom: 8px;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary);
  border-bottom: 2px solid var(--color-accent);
  padding-bottom: 2px;
}

.related-links-item:hover {
  color: var(--color-accent);
  border-bottom-color: var(--color-primary);
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}

.related-card {
  display: block;
  background-color: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.related-card:hover {
  transform: translateY(-2px);
  box-shadow: 4px 4px 0 rgba(31, 41, 55, 0.15);
}

.related-card h3 {
  font-size: 16px;
  margin-bottom: 8px;
  color: var(--color-primary);
}

.related-card p {
  font-size: 13px;
  color: var(--color-muted);
  margin: 0;
  line-height: 1.6;
}

/* 表格 */
.template-table-wrap {
  overflow-x: auto;
  margin-bottom: 16px;
}

.feedback-template-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

.feedback-template-table th,
.feedback-template-table td {
  border: 2px solid var(--color-border);
  padding: 12px 14px;
  text-align: left;
  vertical-align: top;
}

.feedback-template-table thead th {
  background-color: var(--color-code-bg);
  font-weight: 700;
}

.feedback-template-table tbody th {
  background-color: var(--color-code-bg);
  font-weight: 600;
  white-space: nowrap;
}

/* 折叠问答 */
.faq-item {
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: 12px;
  background-color: var(--color-surface);
  overflow: hidden;
}

.faq-item summary {
  cursor: pointer;
  padding: 14px 16px;
  font-size: 15px;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  list-style: none;
  position: relative;
  padding-right: 44px;
}

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

.faq-item summary::after {
  content: "+";
  position: absolute;
  right: 16px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 20px;
  font-weight: 700;
  color: var(--color-primary);
  transition: transform 0.15s ease;
}

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

.faq-item[open] summary {
  border-bottom: 2px solid var(--color-border);
  background-color: var(--color-code-bg);
}

.faq-answer {
  padding: 16px;
  font-size: 14px;
}

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

.faq-answer p:last-child {
  margin-bottom: 0;
}

/* --------------------------------------------------------------------------
   Pages — 首页
   -------------------------------------------------------------------------- */

.home-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 20px 64px;
}

/* 首屏 hero */
.hero-section {
  position: relative;
  border: 3px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin: 24px 0 48px;
  background-color: var(--color-surface);
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.18;
}

.hero-content {
  position: relative;
  z-index: 1;
  padding: 40px;
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 32px;
}

.hero-copy h1 {
  font-size: 30px;
  border-bottom: 4px solid var(--color-border);
  padding-bottom: 12px;
  margin-bottom: 16px;
}

.hero-copy p {
  font-size: 15px;
  color: var(--color-text);
  max-width: 520px;
}

.community-map {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.board-directory,
.hot-and-announce {
  background-color: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
}

.board-directory h2,
.hot-topics h2,
.announce-summary h2 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--color-border);
}

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

.board-directory .board-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 8px 0;
  border-bottom: 1px solid var(--color-border);
}

.board-directory .board-item:last-child {
  border-bottom: none;
}

.board-name {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text);
}

.board-desc {
  font-size: 12px;
  color: var(--color-muted);
  flex: 1;
  margin: 0;
}

.board-directory .board-item a {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-primary);
  white-space: nowrap;
}

.hot-list {
  display: flex;
  flex-direction: column;
}

.hot-item {
  padding: 8px 0;
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  gap: 8px;
}

.hot-item:last-child {
  border-bottom: none;
}

.hot-item a {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text);
  flex: 1;
}

.hot-item a:hover {
  color: var(--color-primary);
}

.topic-tag {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  color: var(--color-primary);
  background-color: rgba(14, 116, 144, 0.1);
  border: 1px solid var(--color-primary);
  border-radius: var(--radius-sm);
  padding: 1px 8px;
  white-space: nowrap;
}

.announce-summary p {
  font-size: 13px;
  color: var(--color-muted);
  margin-bottom: 12px;
}

.rule-link {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-primary);
  border-bottom: 2px solid var(--color-accent);
  padding-bottom: 2px;
}

.post-entry-btn {
  display: inline-block;
  margin-top: 12px;
  background-color: var(--color-accent);
  color: var(--color-text);
  font-size: 15px;
  font-weight: 700;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 10px 24px;
  transition: background-color 0.15s ease, transform 0.15s ease;
  text-align: center;
}

.post-entry-btn:hover {
  background-color: var(--color-primary);
  color: var(--color-surface);
  transform: translateY(-1px);
}

/* 新手路径 */
.beginner-path {
  margin-bottom: 48px;
}

.beginner-path > h2 {
  font-size: 22px;
  margin-bottom: 8px;
}

.path-steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 24px;
}

.path-step {
  background-color: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px;
  position: relative;
}

.step-num {
  display: inline-block;
  width: 32px;
  height: 32px;
  line-height: 28px;
  text-align: center;
  font-size: 16px;
  font-weight: 800;
  background-color: var(--color-accent);
  color: var(--color-text);
  border: 2px solid var(--color-border);
  border-radius: 50%;
  margin-bottom: 12px;
}

.path-step h3 {
  font-size: 17px;
  margin-bottom: 8px;
}

.path-step p {
  font-size: 13px;
  color: var(--color-muted);
  margin-bottom: 8px;
}

.path-step a {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary);
}

.step-example {
  font-size: 12px;
  color: var(--color-muted);
  background-color: var(--color-code-bg);
  border-left: 3px solid var(--color-accent);
  padding: 8px 12px;
  margin-top: 8px;
  line-height: 1.6;
}

/* 版块速览 */
.board-overview {
  margin-bottom: 48px;
}

.board-overview > h2 {
  font-size: 22px;
  margin-bottom: 8px;
}

.section-intro {
  font-size: 14px;
  color: var(--color-muted);
  margin-bottom: 24px;
}

.board-cards {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
}

.board-card {
  background-color: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
  display: flex;
  flex-direction: column;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.board-card:hover {
  transform: translateY(-3px);
  box-shadow: 4px 4px 0 rgba(31, 41, 55, 0.15);
}

.board-card h3 {
  font-size: 16px;
  margin-bottom: 8px;
  color: var(--color-primary);
}

.board-card p {
  font-size: 13px;
  color: var(--color-muted);
  margin-bottom: 10px;
  flex: 1;
}

.board-card .card-tag {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  color: var(--color-text);
  background-color: var(--color-code-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 2px 8px;
  margin-right: 6px;
  margin-bottom: 6px;
}

.board-card > a {
  display: inline-block;
  margin-top: 8px;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-primary);
  border-bottom: 2px solid var(--color-accent);
  padding-bottom: 2px;
  align-self: flex-start;
}

/* 社区说明 */
.community-intro {
  margin-bottom: 48px;
}

.intro-copy h2 {
  font-size: 22px;
  margin-bottom: 16px;
}

.intro-copy p {
  font-size: 15px;
  color: var(--color-text);
  max-width: 760px;
}

.intro-media {
  margin: 24px 0;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.intro-media img {
  width: 100%;
  aspect-ratio: 16 / 7;
  object-fit: cover;
}

.intro-media figcaption {
  font-size: 12px;
  color: var(--color-muted);
  padding: 8px 14px;
  background-color: var(--color-code-bg);
  border-top: 1px solid var(--color-border);
}

.clarify-boxes {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-top: 24px;
}

.clarify-box {
  background-color: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
}

.clarify-box h3 {
  font-size: 16px;
  margin-bottom: 8px;
  padding-bottom: 6px;
  border-bottom: 2px solid var(--color-accent);
}

.clarify-box p {
  font-size: 13px;
  color: var(--color-muted);
  margin: 0;
}

/* --------------------------------------------------------------------------
   Pages — 版块总览
   -------------------------------------------------------------------------- */

.page-layout.sidebar-left {
  margin-top: 8px;
}

.tab-group {
  display: flex;
  gap: 8px;
  margin-bottom: 24px;
  border-bottom: 2px solid var(--color-border);
  padding-bottom: 12px;
}

.tab-item {
  background-color: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 8px 20px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  color: var(--color-text);
  transition: background-color 0.15s ease, color 0.15s ease;
  min-height: 44px;
}

.tab-item.is-active {
  background-color: var(--color-border);
  color: var(--color-surface);
}

.tab-item:hover {
  background-color: var(--color-accent);
  color: var(--color-text);
}

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

.tab-panel > h2 {
  font-size: 20px;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--color-border);
}

.tab-panel > p {
  font-size: 14px;
  color: var(--color-muted);
  margin-bottom: 16px;
}

/* 版块条目 */
.content-area .board-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.content-area .board-item {
  background-color: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
}

.board-info {
  flex: 1;
}

.board-info h3 {
  font-size: 16px;
  margin-bottom: 6px;
}

.board-info p {
  font-size: 13px;
  color: var(--color-muted);
  margin-bottom: 8px;
}

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

.topic-tags .topic-tag {
  font-size: 11px;
}

.board-link {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
  border-radius: var(--radius-sm);
  padding: 6px 16px;
  white-space: nowrap;
  transition: background-color 0.15s ease, color 0.15s ease;
}

.board-link:hover {
  background-color: var(--color-primary);
  color: var(--color-surface);
}

/* 发帖导航 */
.posting-guide {
  margin-top: 40px;
  padding-top: 24px;
  border-top: 2px solid var(--color-border);
}

.posting-guide h2 {
  font-size: 20px;
  margin-bottom: 16px;
}

.guide-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.guide-card {
  background-color: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
}

.guide-card h3 {
  font-size: 15px;
  margin-bottom: 8px;
  color: var(--color-primary);
}

.guide-card p {
  font-size: 13px;
  color: var(--color-muted);
  margin: 0;
  line-height: 1.6;
}

/* --------------------------------------------------------------------------
   Pages — 新手指南
   -------------------------------------------------------------------------- */

.guide-aside .aside-card {
  margin-bottom: 16px;
}

.guide-aside .aside-card img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-sm);
  margin-bottom: 12px;
}

.guide-aside .aside-tip {
  background-color: rgba(245, 158, 11, 0.1);
  border: 2px solid var(--color-accent);
  border-radius: var(--radius-sm);
  padding: 14px;
}

.guide-aside .aside-tip h3 {
  font-size: 14px;
  margin-bottom: 6px;
}

.guide-aside .aside-tip p {
  font-size: 12px;
  color: var(--color-muted);
  margin: 0;
  line-height: 1.6;
}

.guide-intro {
  margin-bottom: 32px;
}

.guide-intro h2 {
  font-size: 20px;
  margin-bottom: 12px;
}

.guide-intro p {
  font-size: 14px;
  color: var(--color-muted);
}

.guide-step {
  margin-bottom: 32px;
  background-color: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px;
}

.step-head {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--color-border);
}

.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  flex-shrink: 0;
  font-size: 16px;
  font-weight: 800;
  background-color: var(--color-accent);
  color: var(--color-text);
  border: 2px solid var(--color-border);
  border-radius: 50%;
}

.step-head h2 {
  font-size: 18px;
  margin: 0;
}

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

.step-example,
.step-counterexample {
  margin-top: 12px;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
}

.step-example {
  background-color: rgba(14, 116, 144, 0.06);
  border-left: 4px solid var(--color-primary);
}

.step-counterexample {
  background-color: rgba(245, 158, 11, 0.08);
  border-left: 4px solid var(--color-accent);
}

.step-example h3,
.step-counterexample h3 {
  font-size: 13px;
  margin-bottom: 6px;
}

.step-example p,
.step-counterexample p {
  font-size: 13px;
  color: var(--color-muted);
  margin: 0;
  line-height: 1.7;
}

.step-link {
  margin-top: 12px;
}

.step-link a {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary);
  border-bottom: 2px solid var(--color-accent);
  padding-bottom: 2px;
}

/* 新手任务 */
.starter-tasks {
  margin-top: 40px;
  background-color: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px;
}

.starter-tasks h2 {
  font-size: 20px;
  margin-bottom: 8px;
}

.starter-tasks > p {
  font-size: 14px;
  color: var(--color-muted);
  margin-bottom: 16px;
}

.task-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.task-list li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background-color: var(--color-code-bg);
}

.task-check {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  flex-shrink: 0;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-sm);
  background-color: var(--color-surface);
  margin-top: 2px;
}

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

/* --------------------------------------------------------------------------
   Pages — 社区规则
   -------------------------------------------------------------------------- */

.layout-shell.sidebar-left {
  margin-top: 0;
}

.rule-sidebar .sidebar-inner {
  display: flex;
  flex-direction: column;
}

.sidebar-note {
  font-size: 12px;
  color: var(--color-muted);
  margin-top: 16px;
  padding-top: 12px;
  border-top: 1px solid var(--color-border);
  line-height: 1.6;
}

.rule-group {
  margin-bottom: 40px;
}

.rule-group > h2 {
  font-size: 20px;
  margin-bottom: 8px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--color-border);
}

.group-intro {
  font-size: 14px;
  color: var(--color-muted);
  margin-bottom: 20px;
}

.rule-item {
  background-color: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
  margin-bottom: 16px;
}

.rule-item h3 {
  font-size: 16px;
  margin-bottom: 8px;
  color: var(--color-primary);
}

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

.rule-example,
.rule-counterexample {
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  margin-bottom: 8px;
  font-size: 13px;
}

.rule-example {
  background-color: rgba(14, 116, 144, 0.06);
  border-left: 4px solid var(--color-primary);
}

.rule-counterexample {
  background-color: rgba(245, 158, 11, 0.08);
  border-left: 4px solid var(--color-accent);
  margin-bottom: 0;
}

.example-label,
.counterexample-label {
  font-weight: 700;
  font-size: 12px;
  margin-bottom: 4px;
}

.example-label {
  color: var(--color-primary);
}

.counterexample-label {
  color: var(--color-accent);
}

.rule-example p,
.rule-counterexample p {
  margin: 0;
  line-height: 1.6;
  color: var(--color-muted);
}

/* 违规处理 */
.violation-levels {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.violation-card {
  background-color: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
}

.violation-card h3 {
  font-size: 16px;
  margin-bottom: 8px;
  padding-bottom: 6px;
  border-bottom: 2px solid var(--color-accent);
}

.violation-card p {
  font-size: 13px;
  color: var(--color-muted);
  margin-bottom: 8px;
}

.violation-case {
  font-size: 12px;
  background-color: var(--color-code-bg);
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
}

/* 申诉反馈 */
.appeal-section {
  margin-top: 40px;
  background-color: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px;
}

.appeal-section h2 {
  font-size: 20px;
  margin-bottom: 12px;
}

.appeal-section p {
  font-size: 14px;
  color: var(--color-muted);
}

/* --------------------------------------------------------------------------
   Pages — 常见问题
   -------------------------------------------------------------------------- */

.faq-layout .faq-topic-nav {
  position: sticky;
  top: 88px;
}

.topic-nav-image {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-sm);
  margin-bottom: 12px;
}

.topic-nav-tip {
  font-size: 12px;
  color: var(--color-muted);
  margin-top: 12px;
  padding-top: 10px;
  border-top: 1px solid var(--color-border);
  line-height: 1.6;
}

.topic-nav-tip a {
  font-size: 12px;
  font-weight: 600;
  color: var(--color-primary);
}

.faq-group {
  margin-bottom: 40px;
}

.faq-group > h2 {
  font-size: 20px;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--color-border);
}

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

.related-list a {
  display: inline-block;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary);
  border-bottom: 2px solid var(--color-accent);
  padding-bottom: 2px;
}

/* --------------------------------------------------------------------------
   Pages — 关于
   -------------------------------------------------------------------------- */

.about-page {
  max-width: 860px;
}

.about-intro h2 {
  font-size: 20px;
  margin-bottom: 16px;
}

.about-intro p {
  font-size: 15px;
  color: var(--color-text);
  margin-bottom: 16px;
}

.about-figure {
  margin: 24px 0;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.about-figure img {
  width: 100%;
  aspect-ratio: 16 / 7;
  object-fit: cover;
}

.about-figure figcaption {
  font-size: 12px;
  color: var(--color-muted);
  padding: 8px 14px;
  background-color: var(--color-code-bg);
  border-top: 1px solid var(--color-border);
}

.about-clarify {
  margin: 32px 0;
}

.about-clarify > h2 {
  font-size: 20px;
  margin-bottom: 16px;
}

.clarify-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.clarify-item {
  background-color: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
}

.clarify-item h3 {
  font-size: 16px;
  margin-bottom: 8px;
  padding-bottom: 6px;
  border-bottom: 2px solid var(--color-accent);
}

.clarify-item p {
  font-size: 13px;
  color: var(--color-muted);
  margin-bottom: 8px;
}

.clarify-fact {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-primary);
  background-color: rgba(14, 116, 144, 0.06);
  border-left: 3px solid var(--color-primary);
  padding: 8px 12px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.about-principles {
  margin: 32px 0;
}

.about-principles > h2 {
  font-size: 20px;
  margin-bottom: 8px;
}

.principles-lead {
  font-size: 14px;
  color: var(--color-muted);
  margin-bottom: 20px;
}

.principles-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.principles-list li {
  background-color: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.principles-list h3 {
  font-size: 16px;
  color: var(--color-primary);
}

.principles-list p {
  font-size: 14px;
  color: var(--color-muted);
  margin: 0;
  line-height: 1.6;
}

.about-links {
  margin-top: 32px;
}

.about-links > h2 {
  font-size: 20px;
  margin-bottom: 16px;
}

.links-group {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.links-group a {
  display: inline-block;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
  border-radius: var(--radius-sm);
  padding: 8px 20px;
  transition: background-color 0.15s ease, color 0.15s ease;
}

.links-group a:hover {
  background-color: var(--color-primary);
  color: var(--color-surface);
}

/* --------------------------------------------------------------------------
   Pages — 反馈
   -------------------------------------------------------------------------- */

.feedback-channel,
.feedback-template-section,
.invalid-feedback,
.next-steps {
  max-width: 860px;
}

.feedback-channel h2,
.feedback-template-section h2,
.invalid-feedback h2,
.next-steps h2 {
  font-size: 20px;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--color-border);
}

.feedback-channel p,
.feedback-template-section > p,
.invalid-feedback > p,
.next-steps > p {
  font-size: 14px;
  color: var(--color-muted);
  margin-bottom: 16px;
}

.feedback-figure {
  margin: 20px 0;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.feedback-figure img {
  width: 100%;
  aspect-ratio: 16 / 7;
  object-fit: cover;
}

.feedback-figure figcaption {
  font-size: 12px;
  color: var(--color-muted);
  padding: 8px 14px;
  background-color: var(--color-code-bg);
  border-top: 1px solid var(--color-border);
}

.template-tip {
  font-size: 13px;
  color: var(--color-muted);
  background-color: rgba(245, 158, 11, 0.08);
  border: 1px solid var(--color-accent);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  margin-top: 16px;
}

.invalid-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 20px;
}

.invalid-card {
  background-color: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
}

.invalid-card h3 {
  font-size: 15px;
  margin-bottom: 8px;
  padding-bottom: 6px;
  border-bottom: 2px solid var(--color-accent);
}

.invalid-card p {
  font-size: 13px;
  color: var(--color-muted);
  margin-bottom: 8px;
  line-height: 1.6;
}

.improve-suggestion {
  font-size: 12px;
  color: var(--color-primary);
  background-color: rgba(14, 116, 144, 0.06);
  border-left: 3px solid var(--color-primary);
  padding: 8px 12px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.next-steps {
  margin-top: 40px;
}

.next-steps-links {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.next-steps-links a {
  display: inline-block;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
  border-radius: var(--radius-sm);
  padding: 8px 20px;
  transition: background-color 0.15s ease, color 0.15s ease;
}

.next-steps-links a:hover {
  background-color: var(--color-primary);
  color: var(--color-surface);
}

/* --------------------------------------------------------------------------
   Pages — 站点地图
   -------------------------------------------------------------------------- */

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

.sitemap-section > h2,
.sitemap-intro h2 {
  font-size: 20px;
  margin-bottom: 8px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--color-border);
}

.sitemap-intro p,
.section-desc {
  font-size: 14px;
  color: var(--color-muted);
  margin-bottom: 16px;
}

.sitemap-figure {
  margin: 20px 0;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.sitemap-figure img {
  width: 100%;
  aspect-ratio: 16 / 6;
  object-fit: cover;
}

.sitemap-figure figcaption {
  font-size: 12px;
  color: var(--color-muted);
  padding: 8px 14px;
  background-color: var(--color-code-bg);
  border-top: 1px solid var(--color-border);
}

.sitemap-group-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 24px;
}

.sitemap-group {
  background-color: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
}

.sitemap-group .group-title {
  font-size: 16px;
  margin-bottom: 6px;
  color: var(--color-primary);
}

.group-desc {
  font-size: 13px;
  color: var(--color-muted);
  margin-bottom: 10px;
  line-height: 1.6;
}

.sitemap-group a {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-primary);
  border-bottom: 2px solid var(--color-accent);
  padding-bottom: 2px;
}

.page-list {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}

.page-list li a {
  display: block;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text);
  background-color: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  transition: border-color 0.15s ease, color 0.15s ease;
}

.page-list li a:hover {
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.path-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.path-item {
  background-color: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
}

.path-item .path-title {
  font-size: 16px;
  margin-bottom: 8px;
  color: var(--color-primary);
}

.path-desc {
  font-size: 13px;
  color: var(--color-muted);
  margin-bottom: 12px;
  line-height: 1.6;
}

.path-item a {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-primary);
  border-bottom: 2px solid var(--color-accent);
  padding-bottom: 2px;
}

.sitemap-section .related-links ul {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
}

.sitemap-section .related-links ul a {
  display: inline-block;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary);
  border-bottom: 2px solid var(--color-accent);
  padding-bottom: 2px;
}

/* --------------------------------------------------------------------------
   Pages — 404
   -------------------------------------------------------------------------- */

.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 60vh;
  padding: 40px 20px;
}

.error-wrap {
  max-width: 560px;
  text-align: center;
  background-color: var(--color-surface);
  border: 3px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 48px 40px;
}

.error-code {
  font-family: var(--font-mono);
  font-size: 48px;
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1;
  margin-bottom: 16px;
}

.error-wrap h1 {
  font-size: 24px;
  border-bottom: none;
  padding-bottom: 0;
  margin-bottom: 12px;
}

.error-desc {
  font-size: 14px;
  color: var(--color-muted);
  margin-bottom: 24px;
}

.error-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 16px;
}

.error-actions a {
  display: inline-block;
  font-size: 14px;
  font-weight: 600;
  border-radius: var(--radius-sm);
  padding: 10px 24px;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.btn-back-home {
  background-color: var(--color-primary);
  color: var(--color-surface);
  border: 2px solid var(--color-border);
}

.btn-back-home:hover {
  background-color: var(--color-accent);
  color: var(--color-text);
}

.btn-to-forum {
  background-color: var(--color-surface);
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}

.btn-to-forum:hover {
  background-color: var(--color-primary);
  color: var(--color-surface);
}

.error-tip {
  font-size: 12px;
  color: var(--color-muted);
  margin: 0;
}

/* --------------------------------------------------------------------------
   Responsive — 响应式断点
   -------------------------------------------------------------------------- */

/* 1024px 及以下 */
@media (max-width: 1024px) {
  .hero-content {
    grid-template-columns: 1fr;
  }

  .community-map {
    grid-template-columns: 1fr 1fr;
  }

  .board-cards {
    grid-template-columns: repeat(3, 1fr);
  }

  .sidebar-left {
    grid-template-columns: 220px 1fr;
    gap: 24px;
  }

  .sitemap-group-list {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-list {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* 768px 及以下 — 平板竖屏与手机 */
@media (max-width: 768px) {
  .header-inner {
    min-height: 60px;
    flex-wrap: wrap;
    padding: 8px 16px;
  }

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    width: 100%;
    order: 3;
  }

  .site-nav .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    border-top: 2px solid var(--color-border);
    margin-top: 8px;
    padding-top: 8px;
    width: 100%;
  }

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

  .site-nav .nav-list a {
    padding: 14px 8px;
    font-size: 16px;
    border-bottom: 1px solid var(--color-border);
    min-height: 48px;
    display: flex;
    align-items: center;
  }

  .site-nav .nav-list a.is-current {
    border-bottom: 1px solid var(--color-border);
    background-color: rgba(14, 116, 144, 0.08);
  }

  .hero-content {
    padding: 24px;
  }

  .community-map {
    grid-template-columns: 1fr;
  }

  .path-steps {
    grid-template-columns: 1fr;
  }

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

  .clarify-boxes {
    grid-template-columns: 1fr;
  }

  .sidebar-left {
    grid-template-columns: 1fr;
  }

  .sidebar-left .sidebar,
  .sidebar-left .guide-aside,
  .sidebar-left .faq-topic-nav {
    position: static;
    order: 2;
    margin-top: 24px;
  }

  .sidebar-left .content-area,
  .sidebar-left .guide-content,
  .sidebar-left .faq-content,
  .sidebar-left .rule-content {
    order: 1;
  }

  .footer-inner {
    grid-template-columns: 1fr 1fr;
    gap: 24px;
  }

  .violation-levels {
    grid-template-columns: 1fr;
  }

  .invalid-cards {
    grid-template-columns: 1fr;
  }

  .guide-grid {
    grid-template-columns: 1fr;
  }

  .path-list {
    grid-template-columns: 1fr;
  }

  .sitemap-group-list {
    grid-template-columns: 1fr;
  }

  .page-list {
    grid-template-columns: repeat(2, 1fr);
  }

  .clarify-grid {
    grid-template-columns: 1fr;
  }

  .tab-group {
    flex-wrap: wrap;
  }

  .tab-item {
    flex: 1 1 auto;
    text-align: center;
  }
}

/* 480px 及以下 — 小屏手机 */
@media (max-width: 480px) {
  .hero-content {
    padding: 16px;
  }

  .board-cards {
    grid-template-columns: 1fr;
  }

  .footer-inner {
    grid-template-columns: 1fr;
  }

  .page-list {
    grid-template-columns: 1fr;
  }

  .content-area .board-item {
    flex-direction: column;
    align-items: flex-start;
  }

  .board-link {
    align-self: flex-start;
  }

  .step-head {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .error-wrap {
    padding: 32px 24px;
  }

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

  .template-table-wrap {
    margin: 0 -8px;
  }

  .feedback-template-table th,
  .feedback-template-table td {
    padding: 8px 10px;
    font-size: 12px;
  }

  .feedback-template-table tbody th {
    white-space: normal;
  }

  .next-steps-links {
    flex-direction: column;
  }

  .next-steps-links a {
    text-align: center;
  }

  .links-group {
    flex-direction: column;
  }

  .links-group a {
    text-align: center;
  }

  .error-actions {
    flex-direction: column;
  }

  .error-actions a {
    width: 100%;
  }
}