/* ==========================================================================
   糖心veol 论坛 · 全站样式表
   视觉方向：会议资料风 — 议程网格 + 版块表格骨架
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Base — 基础变量、重置、字体、通用元素
   -------------------------------------------------------------------------- */
:root {
  --color-primary: #1F3A5F;
  --color-primary-light: #2c4f7c;
  --color-accent: #D97706;
  --color-accent-dark: #b56205;
  --color-bg: #F5F6F8;
  --color-surface: #ffffff;
  --color-text: #333333;
  --color-text-secondary: #6B7280;
  --color-border: #e3e6ea;
  --color-border-light: #eef0f3;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: "SF Mono", SFMono-Regular, Consolas, "Liberation Mono", Menlo, monospace;

  --container-width: 1200px;
  --container-padding: 24px;

  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;

  --shadow-sm: 0 1px 2px rgba(31, 58, 95, 0.06);
  --shadow-md: 0 2px 6px rgba(31, 58, 95, 0.08);
  --shadow-lg: 0 4px 16px rgba(31, 58, 95, 0.08);

  --header-height: 64px;
  --footer-bg: #1c2b3f;
}

*,
*::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: 16px;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

ul,
ol {
  list-style: none;
}

h1,
h2,
h3,
h4 {
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1.3;
}

h1 {
  font-size: 28px;
}

h2 {
  font-size: 22px;
}

h3 {
  font-size: 18px;
}

p {
  margin-bottom: 0.5em;
}

/* 表格基础 */
table {
  width: 100%;
  border-collapse: collapse;
}

th,
td {
  text-align: left;
  vertical-align: middle;
}

/* 按钮基础 */
.btn-primary,
.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 22px;
  border-radius: var(--radius-md);
  font-size: 15px;
  font-weight: 600;
  line-height: 1.4;
  cursor: pointer;
  transition: background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease;
  border: 2px solid transparent;
  min-height: 44px;
}

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

.btn-primary:hover {
  background-color: var(--color-accent-dark);
  border-color: var(--color-accent-dark);
  color: #ffffff;
}

.btn-secondary {
  background-color: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.btn-secondary:hover {
  background-color: var(--color-primary);
  color: #ffffff;
}

/* 标签 */
.tag {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 999px;
  background-color: rgba(217, 119, 6, 0.12);
  color: var(--color-accent-dark);
  font-size: 13px;
  font-weight: 600;
  line-height: 1.5;
  white-space: nowrap;
}

/* 折叠面板 */
details {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background-color: var(--color-surface);
}

summary {
  padding: 14px 18px;
  cursor: pointer;
  font-weight: 600;
  color: var(--color-primary);
  font-size: 15px;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

summary::-webkit-details-marker {
  display: none;
}

summary::after {
  content: "+";
  font-size: 20px;
  font-weight: 400;
  color: var(--color-text-secondary);
  transition: transform 0.2s ease;
}

details[open] summary::after {
  transform: rotate(45deg);
}

details p {
  padding: 0 18px 16px;
  font-size: 15px;
  color: var(--color-text);
}

/* --------------------------------------------------------------------------
   2. Layout — 全局布局骨架：页头、主容器、页脚
   -------------------------------------------------------------------------- */
.site-header {
  background-color: var(--color-primary);
  border-bottom: 3px solid var(--color-accent);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--container-padding);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: var(--header-height);
}

.brand-logo {
  display: inline-flex;
  align-items: center;
  font-size: 20px;
  font-weight: 700;
  color: #ffffff;
  letter-spacing: 0.02em;
  white-space: nowrap;
  flex-shrink: 0;
}

.brand-logo::before {
  content: "";
  display: inline-block;
  width: 22px;
  height: 22px;
  margin-right: 10px;
  border-radius: var(--radius-sm);
  background-color: var(--color-accent);
}

.brand-logo:hover {
  color: #ffffff;
}

.site-nav {
  flex: 1;
  display: flex;
  justify-content: center;
}

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

.nav-list li a {
  display: block;
  padding: 8px 14px;
  font-size: 15px;
  color: rgba(255, 255, 255, 0.85);
  border-radius: var(--radius-sm);
  transition: background-color 0.2s ease, color 0.2s ease;
}

.nav-list li a:hover {
  background-color: rgba(255, 255, 255, 0.1);
  color: #ffffff;
}

.nav-list li a.is-current {
  background-color: rgba(217, 119, 6, 0.85);
  color: #ffffff;
  font-weight: 600;
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  background: none;
  border: 1px solid rgba(255, 255, 255, 0.4);
  border-radius: var(--radius-sm);
  padding: 8px 14px;
  cursor: pointer;
  min-height: 44px;
  color: #ffffff;
  font-size: 15px;
  font-family: inherit;
}

.nav-toggle-icon {
  display: inline-block;
  width: 16px;
  height: 12px;
  position: relative;
}

.nav-toggle-icon::before,
.nav-toggle-icon::after {
  content: "";
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: #ffffff;
  border-radius: 2px;
}

.nav-toggle-icon::before {
  top: 0;
  box-shadow: 0 5px 0 #ffffff;
}

.nav-toggle-icon::after {
  bottom: 0;
}

.nav-toggle-text {
  font-weight: 600;
}

.post-entry-btn {
  flex-shrink: 0;
  padding: 8px 18px;
  min-height: 40px;
  font-size: 14px;
}

.site-main {
  min-height: 60vh;
}

.home-main {
  padding-bottom: 40px;
}

.inner-main {
  padding-bottom: 56px;
}

.layout-shell {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

/* 页脚 */
.site-footer {
  background-color: var(--footer-bg);
  color: rgba(255, 255, 255, 0.75);
  margin-top: 40px;
}

.footer-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px var(--container-padding) 32px;
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
  gap: 40px;
}

.footer-col h3 {
  color: #ffffff;
  font-size: 16px;
  margin-bottom: 16px;
}

.footer-col ul li {
  margin-bottom: 10px;
}

.footer-col ul li a {
  color: rgba(255, 255, 255, 0.7);
  font-size: 14px;
}

.footer-col ul li a:hover {
  color: var(--color-accent);
}

.footer-logo {
  font-size: 18px;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 8px;
}

.footer-brand p {
  font-size: 14px;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.6);
}

.boundary-note {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.45);
  line-height: 1.7;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 14px;
  margin-top: 14px;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding: 18px var(--container-padding);
  text-align: center;
}

.footer-bottom p {
  max-width: var(--container-width);
  margin: 0 auto;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.4);
}

/* 面包屑 */
.breadcrumb {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 18px var(--container-padding) 0;
  font-size: 14px;
  color: var(--color-text-secondary);
  display: flex;
  align-items: center;
  gap: 8px;
}

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

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

.breadcrumb-sep {
  color: #b0b6bf;
  font-size: 12px;
}

.breadcrumb-current {
  color: var(--color-text);
  font-weight: 500;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* 页面标题区 */
.page-header {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 28px var(--container-padding) 8px;
}

.page-title {
  font-size: 28px;
  margin-bottom: 10px;
}

.page-description {
  font-size: 16px;
  color: var(--color-text-secondary);
  max-width: 760px;
  line-height: 1.7;
}

/* 通用区块 */
.section-block {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 40px var(--container-padding) 0;
}

.section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 20px;
}

.section-head h2 {
  font-size: 22px;
}

.section-head p {
  color: var(--color-text-secondary);
  font-size: 15px;
  margin: 0;
}

.section-title {
  font-size: 22px;
  margin-bottom: 8px;
}

.section-desc,
.section-intro,
.section-lead {
  color: var(--color-text-secondary);
  font-size: 15px;
  margin-bottom: 20px;
  max-width: 760px;
}

/* --------------------------------------------------------------------------
   3. Components — 通用组件：表格、卡片、侧栏、时间线、步骤、列表
   -------------------------------------------------------------------------- */

/* 表格容器 */
.table-wrap,
.table-wrapper {
  background-color: var(--color-surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  overflow-x: auto;
  box-shadow: var(--shadow-sm);
}

.board-table {
  min-width: 640px;
  font-size: 15px;
}

.board-table thead th {
  background-color: var(--color-primary);
  color: #ffffff;
  padding: 12px 16px;
  font-weight: 600;
  font-size: 14px;
  white-space: nowrap;
}

.board-table tbody td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--color-border-light);
  color: var(--color-text);
  vertical-align: top;
}

.board-table tbody tr:last-child td {
  border-bottom: none;
}

.board-table tbody tr:hover {
  background-color: #f8fafc;
}

.board-table td:first-child {
  font-weight: 600;
  color: var(--color-primary);
}

.table-footer-note {
  margin-top: 12px;
  font-size: 14px;
  color: var(--color-text-secondary);
}

.table-footer-note a {
  color: var(--color-accent);
  font-weight: 600;
}

/* 侧栏卡片 */
.side-card,
.aside-card,
.sidebar-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 20px;
  box-shadow: var(--shadow-sm);
}

.side-title,
.aside-title,
.sidebar-title {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--color-accent);
}

/* 通知列表 */
.notice-list li {
  padding: 10px 0;
  border-bottom: 1px solid var(--color-border-light);
}

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

.notice-list li a {
  font-size: 14px;
  line-height: 1.6;
  display: block;
}

.notice-list li a:hover {
  color: var(--color-accent);
}

/* 时间线 */
.timeline-list {
  position: relative;
}

.timeline-list li {
  position: relative;
  padding-left: 28px;
  padding-bottom: 24px;
}

.timeline-list li::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 6px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background-color: var(--color-accent);
  border: 2px solid var(--color-surface);
  box-shadow: 0 0 0 2px var(--color-accent);
}

.timeline-list li::after {
  content: "";
  position: absolute;
  left: 10px;
  top: 22px;
  bottom: -2px;
  width: 2px;
  background-color: var(--color-border);
}

.timeline-list li:last-child::after {
  display: none;
}

.timeline-list time {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-text-secondary);
  margin-bottom: 4px;
}

.timeline-list h3 {
  font-size: 16px;
  margin-bottom: 4px;
}

.timeline-list h3 a {
  color: var(--color-primary);
}

.timeline-list h3 a:hover {
  color: var(--color-accent);
}

.timeline-list p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.link-more {
  display: inline-block;
  margin-top: 4px;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-accent);
}

.link-more::after {
  content: "→";
  margin-left: 4px;
}

/* 卡片网格 */
.card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.topic-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.2s ease, transform 0.2s ease;
}

.topic-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.topic-card img {
  width: 100%;
  height: 160px;
  object-fit: cover;
}

.card-content {
  padding: 16px 18px 18px;
}

.card-content h3 {
  font-size: 17px;
  margin-bottom: 10px;
  line-height: 1.4;
}

.card-content h3 a {
  color: var(--color-primary);
}

.card-content h3 a:hover {
  color: var(--color-accent);
}

.card-content p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: 10px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.card-content .meta {
  font-size: 13px;
  color: var(--color-text-secondary);
  border-top: 1px solid var(--color-border-light);
  padding-top: 10px;
  margin-bottom: 0;
}

/* 双入口卡片 */
.dual-entry {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.entry-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.2s ease;
}

.entry-card:hover {
  box-shadow: var(--shadow-md);
}

.entry-card h2 {
  font-size: 20px;
  margin-bottom: 10px;
}

.entry-card p {
  font-size: 15px;
  color: var(--color-text-secondary);
  margin-bottom: 18px;
  line-height: 1.7;
}

/* 规则摘要 */
.rules-box {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-sm);
  text-align: center;
}

.rules-box h2 {
  margin-bottom: 10px;
}

.rules-box p {
  font-size: 15px;
  color: var(--color-text-secondary);
  max-width: 680px;
  margin: 0 auto 20px;
  line-height: 1.7;
}

/* 页面布局（主内容 + 侧栏） */
.page-layout {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 24px var(--container-padding) 0;
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 28px;
  align-items: start;
}

.layout-with-aside {
  grid-template-columns: 1fr 280px;
}

.sidebar-left .page-layout {
  grid-template-columns: 280px 1fr;
}

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

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

.sidebar,
.aside-column,
.sidebar-area {
  min-width: 0;
}

.sidebar-figure {
  margin: 16px 0 0;
}

.sidebar-figure img {
  width: 100%;
  height: 140px;
  object-fit: cover;
  border-radius: var(--radius-md);
}

.sidebar-figure figcaption {
  font-size: 13px;
  color: var(--color-text-secondary);
  padding-top: 8px;
  line-height: 1.5;
}

/* 建议列表 */
.suggestion-list li {
  padding: 10px 0;
  border-bottom: 1px solid var(--color-border-light);
}

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

.suggestion-list li a {
  font-size: 14px;
  line-height: 1.6;
  display: block;
}

.suggestion-list li a:hover {
  color: var(--color-accent);
}

/* 规则网格 */
.rules-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.rule-item {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 18px;
}

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

.rule-item p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin: 0;
}

/* 相关帮助 */
.related-help {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 24px var(--container-padding) 0;
}

.related-help p {
  font-size: 15px;
  color: var(--color-text-secondary);
}

.related-help p a {
  color: var(--color-accent);
  font-weight: 600;
}

/* 话题列表 */
.content-section {
  margin-bottom: 32px;
}

.topic-list li {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 16px 18px;
  margin-bottom: 10px;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.topic-list li:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-sm);
}

.topic-main {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.topic-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.topic-title a {
  color: inherit;
}

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

.topic-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.topic-stats {
  font-size: 13px;
  color: var(--color-text-secondary);
  white-space: nowrap;
  font-family: var(--font-mono);
}

/* 精华网格 */
.essence-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.essence-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.2s ease;
}

.essence-card:hover {
  box-shadow: var(--shadow-md);
}

.essence-media img {
  width: 100%;
  height: 140px;
  object-fit: cover;
}

.essence-content {
  padding: 16px 18px 18px;
}

.essence-title {
  font-size: 16px;
  margin-bottom: 8px;
  line-height: 1.4;
}

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

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

.essence-excerpt {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: 10px;
}

.essence-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

/* 标签目录 */
.tag-dir-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 0;
  border-bottom: 1px solid var(--color-border-light);
}

.tag-dir-list li:last-child {
  border-bottom: none;
}

.tag-dir-list li span {
  font-size: 14px;
}

.related-link-card ul li {
  padding: 8px 0;
  border-bottom: 1px solid var(--color-border-light);
}

.related-link-card ul li:last-child {
  border-bottom: none;
}

.related-link-card ul li a {
  font-size: 14px;
}

/* 步骤列表 */
.steps-list {
  counter-reset: step;
}

.step-item {
  display: flex;
  gap: 20px;
  padding: 20px 0;
  border-bottom: 1px solid var(--color-border-light);
}

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

.step-number {
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background-color: var(--color-primary);
  color: #ffffff;
  font-weight: 700;
  font-size: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
}

.step-content {
  flex: 1;
  min-width: 0;
}

.step-content h3 {
  font-size: 17px;
  margin-bottom: 6px;
}

.step-content p {
  font-size: 15px;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.step-content p a {
  color: var(--color-accent);
  font-weight: 600;
}

.step-illustration {
  margin-top: 20px;
}

.step-illustration img {
  width: 100%;
  max-height: 260px;
  object-fit: cover;
  border-radius: var(--radius-md);
}

.step-illustration figcaption {
  font-size: 13px;
  color: var(--color-text-secondary);
  padding-top: 8px;
}

/* 格式要求列表 */
.format-list li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px solid var(--color-border-light);
  font-size: 15px;
  line-height: 1.6;
}

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

.format-list li::before {
  content: "·";
  color: var(--color-accent);
  font-weight: 700;
  font-size: 20px;
  line-height: 1;
}

.format-list strong {
  color: var(--color-primary);
  font-weight: 600;
  margin-right: 4px;
}

/* FAQ */
.faq-item {
  margin-bottom: 12px;
}

.post-faq-section .faq-item:last-child {
  margin-bottom: 0;
}

/* 发帖注意事项侧栏 */
.post-tips-aside {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 24px var(--container-padding) 0;
}

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

.post-tips-aside .aside-card:last-child {
  margin-bottom: 0;
}

.post-tips-aside .aside-card h3 {
  font-size: 16px;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--color-accent);
}

.post-tips-aside .aside-card ul li {
  padding: 6px 0;
  font-size: 14px;
  color: var(--color-text);
  line-height: 1.6;
  position: relative;
  padding-left: 16px;
}

.post-tips-aside .aside-card ul li::before {
  content: "›";
  position: absolute;
  left: 0;
  color: var(--color-accent);
  font-weight: 700;
}

/* 相关链接 */
.related-links {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 24px var(--container-padding) 0;
}

.related-links h2 {
  font-size: 20px;
  margin-bottom: 10px;
}

.related-links p {
  font-size: 15px;
  color: var(--color-text-secondary);
}

.related-links p a {
  color: var(--color-accent);
  font-weight: 600;
}

/* 新手任务 */
.task-list {
  counter-reset: task;
}

.task-item {
  display: flex;
  gap: 20px;
  padding: 24px 0;
  border-bottom: 1px solid var(--color-border-light);
}

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

.task-number {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  background-color: var(--color-primary);
  color: #ffffff;
  font-weight: 700;
  font-size: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
}

.task-content {
  flex: 1;
  min-width: 0;
}

.task-content h3 {
  font-size: 18px;
  margin-bottom: 6px;
}

.task-content p {
  font-size: 15px;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 4px;
}

.task-content p a {
  color: var(--color-accent);
  font-weight: 600;
}

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

.task-media img {
  width: 100%;
  max-height: 240px;
  object-fit: cover;
  border-radius: var(--radius-md);
}

.task-media figcaption {
  font-size: 13px;
  color: var(--color-text-secondary);
  padding-top: 8px;
}

/* 功能卡片 */
.features-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.feature-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.2s ease;
}

.feature-card:hover {
  box-shadow: var(--shadow-md);
}

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

.feature-card p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin: 0;
}

/* 规则页锚点 */
.anchor-list li {
  padding: 8px 0;
  border-bottom: 1px solid var(--color-border-light);
}

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

.anchor-list li a {
  font-size: 15px;
  font-weight: 500;
  display: block;
}

.anchor-list li a:hover {
  color: var(--color-accent);
}

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

.rules-section {
  margin-bottom: 36px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-sm);
}

.rules-section > h2 {
  font-size: 20px;
  margin-bottom: 10px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--color-accent);
}

.principle-list li,
.prohibited-list li {
  padding: 10px 0;
  border-bottom: 1px solid var(--color-border-light);
  font-size: 15px;
  line-height: 1.7;
  position: relative;
  padding-left: 24px;
}

.principle-list li::before,
.prohibited-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 18px;
  width: 8px;
  height: 8px;
  border-radius: 2px;
  background-color: var(--color-accent);
}

.principle-list li:last-child,
.prohibited-list li:last-child {
  border-bottom: none;
}

.rules-figure {
  margin: 16px 0;
}

.rules-figure img {
  width: 100%;
  max-height: 220px;
  object-fit: cover;
  border-radius: var(--radius-md);
}

.process-list {
  counter-reset: process;
}

.process-list li {
  display: flex;
  gap: 16px;
  padding: 14px 0;
  border-bottom: 1px solid var(--color-border-light);
}

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

.process-list li h3 {
  font-size: 16px;
  margin-bottom: 4px;
}

.process-list li p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin: 0;
}

.help-link-list li {
  padding: 8px 0;
}

.help-link-list li a {
  font-size: 15px;
  font-weight: 500;
}

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

/* 公告卡片 */
.announcement-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.announcement-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.2s ease;
}

.announcement-card:hover {
  box-shadow: var(--shadow-md);
}

.announcement-date {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-text-secondary);
  margin-bottom: 8px;
}

.announcement-title {
  font-size: 17px;
  margin-bottom: 8px;
}

.announcement-summary {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: 10px;
}

.announcement-card > a {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-accent);
}

/* 更新记录时间线 */
.timeline-section .timeline-list {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px 24px 8px;
  box-shadow: var(--shadow-sm);
}

.timeline-item {
  display: flex;
  gap: 20px;
  padding: 16px 0;
  border-bottom: 1px solid var(--color-border-light);
}

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

.timeline-date {
  flex-shrink: 0;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--color-text-secondary);
  padding-top: 2px;
  min-width: 90px;
}

.timeline-content {
  flex: 1;
  min-width: 0;
}

.timeline-heading {
  font-size: 16px;
  margin-bottom: 6px;
  color: var(--color-primary);
}

.timeline-content p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin: 0;
}

/* 侧栏信息卡片 */
.info-card p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.info-card a {
  display: inline-block;
  margin-top: 12px;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-accent);
}

/* 404 */
.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 60px 24px;
  min-height: 60vh;
}

.error-panel {
  text-align: center;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 48px 40px;
  max-width: 520px;
  width: 100%;
  box-shadow: var(--shadow-md);
}

.error-code {
  font-family: var(--font-mono);
  font-size: 64px;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1;
  margin-bottom: 16px;
}

.error-panel h1 {
  margin-bottom: 12px;
}

.error-desc {
  font-size: 15px;
  color: var(--color-text-secondary);
  margin-bottom: 24px;
}

.error-back {
  display: inline-flex;
}

/* --------------------------------------------------------------------------
   4. Pages — 页面级布局与模块
   -------------------------------------------------------------------------- */

/* 首页 hero */
.hero-section {
  display: grid;
  grid-template-columns: 1fr 360px;
  gap: 32px;
  padding-top: 40px;
  padding-bottom: 8px;
  align-items: start;
}

.hero-copy h1 {
  font-size: 28px;
  line-height: 1.35;
  margin-bottom: 16px;
  max-width: 560px;
}

.hero-copy p {
  font-size: 16px;
  color: var(--color-text-secondary);
  line-height: 1.8;
  margin-bottom: 24px;
  max-width: 560px;
}

.hero-entry {
  display: inline-flex;
}

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

.content-media-primary {
  grid-column: 1 / -1;
  margin-top: 16px;
}

.content-media-primary img {
  width: 100%;
  max-height: 320px;
  object-fit: cover;
  border-radius: var(--radius-lg);
}

.content-media-primary figcaption {
  font-size: 13px;
  color: var(--color-text-secondary);
  padding-top: 8px;
}

/* 首页版块总览 */
.board-overview {
  padding-top: 36px;
}

/* 首页话题精选 */
.topic-collection {
  padding-top: 36px;
}

/* 首页规则摘要 */
.rules-summary {
  padding-top: 36px;
}

/* 版区总览页 */
.board-list-section,
.board-rules-section {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 24px var(--container-padding) 0;
}

.board-rules-section {
  padding-bottom: 24px;
}

/* 话题精选页 */
.posting-entry p {
  font-size: 15px;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.posting-entry p a {
  color: var(--color-accent);
  font-weight: 600;
}

/* 发帖指引页 */
.post-steps-section,
.post-format-section,
.post-faq-section {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 24px var(--container-padding) 0;
}

.post-steps-section {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  margin-top: 24px;
  padding: 24px;
  box-shadow: var(--shadow-sm);
}

.post-format-section {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  margin-top: 24px;
  padding: 24px;
  box-shadow: var(--shadow-sm);
}

.post-faq-section {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  margin-top: 24px;
  padding: 24px;
  box-shadow: var(--shadow-sm);
}

/* 新手指南页 */
.task-list-section,
.features-section {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 24px var(--container-padding) 0;
}

.task-list-section {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  margin-top: 24px;
  padding: 24px;
  box-shadow: var(--shadow-sm);
}

.features-section {
  padding-bottom: 24px;
}

/* 社区公约页布局 */
.rules-aside {
  position: sticky;
  top: calc(var(--header-height) + 20px);
}

.sidebar-left .rules-content {
  min-width: 0;
}

/* 站务动态页 */
.updates-section {
  margin-bottom: 32px;
}

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

/* 平板及以下：≤1024px */
@media (max-width: 1024px) {
  .header-inner {
    gap: 16px;
  }

  .nav-list li a {
    padding: 8px 10px;
    font-size: 14px;
  }

  .hero-section {
    grid-template-columns: 1fr 300px;
    gap: 24px;
  }

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

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

  .footer-inner {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }

  .page-layout,
  .layout-with-aside,
  .sidebar-left .page-layout {
    grid-template-columns: 1fr 260px;
    gap: 20px;
  }

  .sidebar-left .page-layout {
    grid-template-columns: 260px 1fr;
  }
}

/* 移动端：≤768px */
@media (max-width: 768px) {
  :root {
    --container-padding: 16px;
  }

  .header-inner {
    flex-wrap: wrap;
    padding-top: 10px;
    padding-bottom: 10px;
    gap: 10px;
  }

  .brand-logo {
    font-size: 18px;
  }

  .post-entry-btn {
    display: none;
  }

  .site-nav {
    order: 3;
    width: 100%;
    flex-basis: 100%;
    justify-content: flex-start;
  }

  .nav-toggle {
    display: inline-flex;
    margin-left: auto;
  }

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    width: 100%;
    gap: 0;
    background-color: var(--color-primary);
    border-top: 1px solid rgba(255, 255, 255, 0.15);
    padding: 8px 0;
  }

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

  .nav-list li a {
    padding: 12px 16px;
    border-radius: 0;
    font-size: 15px;
  }

  .nav-list li a.is-current {
    border-left: 3px solid var(--color-accent);
  }

  /* hero */
  .hero-section {
    grid-template-columns: 1fr;
    gap: 20px;
    padding-top: 28px;
  }

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

  .hero-aside {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
  }

  .content-media-primary img {
    max-height: 200px;
  }

  /* 区块间距 */
  .section-block {
    padding-top: 28px;
  }

  .section-head {
    flex-direction: column;
    gap: 6px;
  }

  /* 卡片 */
  .card-grid,
  .essence-grid {
    grid-template-columns: 1fr;
  }

  .dual-entry {
    grid-template-columns: 1fr;
  }

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

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

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

  /* 页面布局 */
  .page-layout,
  .layout-with-aside,
  .sidebar-left .page-layout {
    grid-template-columns: 1fr;
    gap: 24px;
  }

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

  /* 移动端顺序：主内容在侧栏之前 */
  .sidebar-left .page-layout .rules-aside {
    order: 2;
  }

  .sidebar-left .page-layout .rules-content {
    order: 1;
  }

  .rules-aside {
    position: static;
  }

  /* 发帖指引移动端顺序 */
  .post-tips-aside {
    order: 2;
  }

  /* 站务动态侧栏 */
  .sidebar-area {
    order: 2;
  }

  .main-content {
    order: 1;
  }

  /* 表格 */
  .board-table {
    min-width: 560px;
  }

  /* 步骤 */
  .step-item,
  .task-item {
    flex-direction: column;
    gap: 12px;
  }

  .step-number,
  .task-number {
    width: 32px;
    height: 32px;
    font-size: 15px;
  }

  /* 时间线 */
  .timeline-item {
    flex-direction: column;
    gap: 6px;
  }

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

  /* 页脚 */
  .footer-inner {
    grid-template-columns: 1fr;
    gap: 28px;
    padding-top: 36px;
  }

  .footer-col {
    padding-bottom: 8px;
  }

  .footer-bottom {
    padding: 14px var(--container-padding);
  }

  /* 面包屑 */
  .breadcrumb {
    padding-top: 14px;
    font-size: 13px;
  }

  /* 页面标题 */
  .page-header {
    padding-top: 20px;
  }

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

  /* FAQ */
  .faq-item summary {
    font-size: 14px;
  }

  /* 404 */
  .error-panel {
    padding: 36px 24px;
  }

  .error-code {
    font-size: 48px;
  }
}

/* 小屏手机：≤480px */
@media (max-width: 480px) {
  .hero-aside {
    grid-template-columns: 1fr;
  }

  .topic-main {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .topic-stats {
    white-space: normal;
    font-size: 12px;
  }

  .essence-meta {
    gap: 6px;
  }

  .footer-inner {
    padding-left: 16px;
    padding-right: 16px;
  }

  .rules-section {
    padding: 20px 16px;
  }

  .post-steps-section,
  .post-format-section,
  .post-faq-section,
  .task-list-section {
    padding: 18px 16px;
  }
}

/* --------------------------------------------------------------------------
   6. Motion — 轻量动效（不影响初始可见性）
   -------------------------------------------------------------------------- */
@media (prefers-reduced-motion: no-preference) {
  .topic-card,
  .essence-card,
  .entry-card,
  .feature-card,
  .announcement-card {
    transition: box-shadow 0.2s ease, transform 0.2s ease;
  }

  .topic-card:hover,
  .essence-card:hover,
  .entry-card:hover,
  .feature-card:hover,
  .announcement-card:hover {
    transform: translateY(-2px);
  }
}