/* ==========================================================
   海角社区 — 全站样式表
   视觉方向：生活论坛风 / 浅灰绿基底 / 白色内容块
   ========================================================== */

/* ==========================================================
   1. Base — 基础变量、重置与全局字体
   ========================================================== */

:root {
  --color-deep-green: #415b57;
  --color-bg-green: #e9efec;
  --color-white: #ffffff;
  --color-accent: #2f6b64;
  --color-warm: #c8683a;
  --color-text-main: #33403d;
  --color-text-light: #6b7a76;
  --color-border: #d8e2de;
  --font-family-base: -apple-system, BlinkMacSystemFont, "Segoe UI",
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue",
    Arial, sans-serif;
  --container-width: 1200px;
  --radius-card: 8px;
  --radius-small: 4px;
  --shadow-light: 0 1px 3px rgba(65, 91, 87, 0.06);
  --transition-base: 0.2s ease;
}

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

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

body {
  margin: 0;
  font-family: var(--font-family-base);
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-text-main);
  background-color: var(--color-bg-green);
}

.site-body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  margin: 0;
  font-weight: 500;
  color: var(--color-deep-green);
  line-height: 1.4;
}

p {
  margin: 0 0 1em;
}

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

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition-base);
}

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

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

figure {
  margin: 0;
}

figcaption {
  font-size: 13px;
  color: var(--color-text-light);
  line-height: 1.6;
  margin-top: 8px;
}

button {
  font-family: inherit;
  font-size: inherit;
  cursor: pointer;
  border: none;
  background: none;
  padding: 0;
}

/* ==========================================================
   2. Layout — 容器、页头、页脚、面包屑、内页骨架
   ========================================================== */

.site-header {
  background-color: var(--color-white);
  border-bottom: 1px solid var(--color-border);
  position: relative;
  z-index: 10;
}

.header-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
  gap: 16px;
}

.brand-link {
  display: inline-flex;
  align-items: center;
  flex-shrink: 0;
}

.brand-name {
  font-size: 20px;
  font-weight: 600;
  color: var(--color-deep-green);
  letter-spacing: 1px;
}

.brand-name::before {
  content: "";
  display: inline-block;
  width: 8px;
  height: 8px;
  background-color: var(--color-warm);
  border-radius: 50%;
  margin-right: 10px;
  vertical-align: 2px;
}

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

.site-nav .nav-list li a {
  display: block;
  padding: 8px 14px;
  font-size: 15px;
  color: var(--color-deep-green);
  border-radius: var(--radius-small);
  position: relative;
}

.site-nav .nav-list li a:hover {
  color: var(--color-accent);
  background-color: var(--color-bg-green);
}

.site-nav .nav-list li a.is-current {
  color: var(--color-accent);
  font-weight: 500;
}

.site-nav .nav-list li a.is-current::after {
  content: "";
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 2px;
  height: 2px;
  background-color: var(--color-accent);
  border-radius: 1px;
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  border-radius: var(--radius-small);
}

.nav-toggle .toggle-bar {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--color-deep-green);
  border-radius: 1px;
  transition: transform var(--transition-base), opacity var(--transition-base);
}

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

.home-main {
  overflow: hidden;
}

.inner-main {
  padding: 28px 0 60px;
}

/* 面包屑 */
.breadcrumb {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 20px 18px;
  font-size: 13px;
  color: var(--color-text-light);
  display: flex;
  align-items: center;
  gap: 6px;
}

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

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

.breadcrumb-sep {
  color: #a3b0ac;
}

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

/* ==========================================================
   3. 内页统一骨架 — 页标题、双栏布局
   ========================================================== */

.inner-main .page-header {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 20px 24px;
}

.page-title {
  font-size: 28px;
  font-weight: 500;
  color: var(--color-deep-green);
  line-height: 1.35;
  margin-bottom: 8px;
}

.page-description {
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-text-light);
  max-width: 780px;
  margin: 0;
}

.page-layout,
.layout-shell {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 20px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  align-items: start;
}

@media (min-width: 1024px) {
  .page-layout,
  .layout-shell {
    grid-template-columns: minmax(0, 1fr) 260px;
  }
}

/* 主内容区 */
.main-wrap,
.main-content {
  min-width: 0;
}

/* 侧栏 */
.side-aside {
  min-width: 0;
}

/* 通用 section 间距 */
.main-wrap > section,
.main-content > section {
  margin-bottom: 32px;
}

.main-wrap > section:last-child,
.main-content > section:last-child {
  margin-bottom: 0;
}

/* ==========================================================
   4. Components — 通用组件
   ========================================================== */

/* 区块标题 */
.section-title {
  font-size: 18px;
  font-weight: 500;
  color: var(--color-deep-green);
  margin-bottom: 14px;
  line-height: 1.4;
}

.section-heading {
  margin-bottom: 20px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.section-heading h2 {
  font-size: 22px;
  font-weight: 500;
  color: var(--color-deep-green);
}

.section-heading p {
  font-size: 14px;
  color: var(--color-text-light);
  margin: 0;
}

/* 内容卡片通用 */
.board-intro,
.topic-section,
.notice-box,
.content-section,
.section-block,
.rule-section,
.faq-section,
.guide-section,
.adjacent-boards {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 24px;
}

/* 图 */
.board-figure,
.content-figure,
.intro-figure,
.guide-figure,
.page-figure {
  margin: 18px 0 0;
  border-radius: var(--radius-card);
  overflow: hidden;
}

.board-figure img,
.content-figure img,
.intro-figure img,
.guide-figure img,
.page-figure img {
  width: 100%;
  height: auto;
  max-height: 320px;
  object-fit: cover;
}

/* 主题标签 */
.topic-tag {
  display: inline-block;
  font-size: 12px;
  color: var(--color-accent);
  background-color: var(--color-bg-green);
  border-radius: 3px;
  padding: 2px 8px;
  margin-right: 10px;
  flex-shrink: 0;
  font-weight: 400;
}

/* ==========================================================
   5. 首页 — home-hero / board-nav / topic-list /
       notice-and-guide
   ========================================================== */

/* --- 首屏 hero --- */
.home-hero {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px 20px 36px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  align-items: center;
}

@media (min-width: 1024px) {
  .home-hero {
    grid-template-columns: 1fr 1.1fr;
    gap: 48px;
    padding: 64px 20px 48px;
  }
}

.hero-copy {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0;
}

.hero-title {
  font-size: 32px;
  font-weight: 500;
  color: var(--color-deep-green);
  line-height: 1.3;
  margin-bottom: 12px;
}

.hero-slogan {
  font-size: 17px;
  color: var(--color-warm);
  margin-bottom: 12px;
  line-height: 1.5;
}

.hero-desc {
  font-size: 15px;
  line-height: 1.75;
  color: var(--color-text-light);
  margin-bottom: 24px;
  max-width: 44ch;
}

.hero-cta {
  display: inline-block;
  background-color: var(--color-accent);
  color: var(--color-white);
  font-size: 15px;
  padding: 12px 28px;
  border-radius: var(--radius-card);
  transition: background-color var(--transition-base);
}

.hero-cta:hover {
  background-color: var(--color-deep-green);
  color: var(--color-white);
}

.hero-figure {
  border-radius: var(--radius-card);
  overflow: hidden;
  box-shadow: var(--shadow-light);
}

.hero-figure img {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

/* --- 版块导航 --- */
.board-nav {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 24px 20px 12px;
}

.board-nav .section-heading {
  margin-bottom: 20px;
}

.board-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

@media (min-width: 640px) {
  .board-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .board-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.board-item {
  display: block;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 20px;
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.board-item:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-light);
}

.board-item h3 {
  font-size: 17px;
  font-weight: 500;
  color: var(--color-deep-green);
  margin-bottom: 6px;
}

.board-item h3::before {
  content: "› ";
  color: var(--color-warm);
  font-weight: 400;
}

.board-item p {
  font-size: 13px;
  color: var(--color-text-light);
  line-height: 1.6;
  margin: 0;
}

/* --- 正在聊的主题 --- */
.topic-list {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 32px 20px 12px;
}

.topic-list .section-heading {
  margin-bottom: 20px;
}

.topic-rows {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  overflow: hidden;
}

.topic-row {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 16px 20px;
  border-bottom: 1px solid var(--color-border);
  transition: background-color var(--transition-base);
}

.topic-row:last-child {
  border-bottom: none;
}

.topic-row:hover {
  background-color: #f6faf8;
}

@media (min-width: 640px) {
  .topic-row {
    flex-direction: row;
    align-items: baseline;
    gap: 16px;
  }

  .topic-board {
    flex-shrink: 0;
    width: 110px;
  }

  .topic-title {
    flex: 0 0 38%;
    font-weight: 500;
  }

  .topic-excerpt {
    flex: 1;
  }
}

.topic-board {
  font-size: 12px;
  color: var(--color-accent);
  background-color: var(--color-bg-green);
  border-radius: 3px;
  padding: 2px 8px;
  display: inline-block;
  align-self: flex-start;
}

.topic-title {
  font-size: 15px;
  color: var(--color-deep-green);
}

.topic-excerpt {
  font-size: 13px;
  color: var(--color-text-light);
  line-height: 1.6;
  margin: 0;
}

.topic-figure {
  margin-top: 24px;
  border-radius: var(--radius-card);
  overflow: hidden;
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  padding: 16px;
}

@media (min-width: 640px) {
  .topic-figure {
    grid-template-columns: 300px 1fr;
    align-items: center;
  }
}

.topic-figure img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  border-radius: var(--radius-small);
}

.topic-figure figcaption {
  margin-top: 0;
  font-size: 14px;
  color: var(--color-text-main);
  line-height: 1.7;
}

/* --- 公告与新手指引 --- */
.notice-and-guide {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 32px 20px 56px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

@media (min-width: 640px) {
  .notice-and-guide {
    grid-template-columns: repeat(2, 1fr);
  }
}

.entry-card {
  display: flex;
  flex-direction: column;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 28px;
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.entry-card:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-light);
}

.entry-card h2 {
  font-size: 18px;
  font-weight: 500;
  color: var(--color-deep-green);
  margin-bottom: 8px;
}

.entry-card h2::before {
  content: "◆ ";
  color: var(--color-warm);
  font-size: 12px;
  vertical-align: 1px;
}

.entry-card p {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 16px;
  flex: 1;
}

.entry-link {
  font-size: 14px;
  color: var(--color-accent);
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.entry-link::after {
  content: "→";
  transition: transform var(--transition-base);
}

.entry-card:hover .entry-link::after {
  transform: translateX(4px);
}

/* ==========================================================
   6. 首页之外的内页 — 版块页 / 指南页 / 规则页
   ========================================================== */

/* --- 版块简介 --- */
.board-intro .intro-content {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.board-intro .intro-content p {
  font-size: 15px;
  line-height: 1.75;
  color: var(--color-text-main);
  margin: 0;
}

/* --- 主题列表（版块页通用） --- */
.topic-section .section-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 16px;
}

.topic-section .section-heading {
  margin-bottom: 16px;
}

.topic-section .topic-list {
  padding: 0;
  max-width: none;
}

.topic-section .topic-list .topic-item {
  padding: 12px 0;
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: flex-start;
  gap: 10px;
}

.topic-section .topic-list .topic-item:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.topic-section .topic-list .topic-item:first-child {
  padding-top: 0;
}

.topic-section .topic-item .topic-title {
  font-size: 15px;
  font-weight: 500;
  color: var(--color-deep-green);
  line-height: 1.5;
  margin-bottom: 2px;
}

.topic-section .topic-item .topic-excerpt,
.topic-section .topic-item .topic-summary {
  font-size: 13px;
  color: var(--color-text-light);
  line-height: 1.6;
  margin: 0;
}

/* 分段控件 */
.topic-tabs {
  display: flex;
  gap: 4px;
  background-color: var(--color-bg-green);
  border-radius: var(--radius-small);
  padding: 3px;
}

.tab-btn {
  font-size: 13px;
  padding: 6px 14px;
  border-radius: var(--radius-small);
  color: var(--color-text-light);
  transition: background-color var(--transition-base), color var(--transition-base);
}

.tab-btn.is-active {
  background-color: var(--color-white);
  color: var(--color-accent);
  font-weight: 500;
  box-shadow: var(--shadow-light);
}

/* 视图切换（shore） */
.view-switch {
  display: flex;
  gap: 4px;
  background-color: var(--color-bg-green);
  border-radius: var(--radius-small);
  padding: 3px;
}

.view-btn {
  font-size: 13px;
  padding: 6px 14px;
  border-radius: var(--radius-small);
  color: var(--color-text-light);
  transition: background-color var(--transition-base), color var(--transition-base);
}

.view-btn.is-active {
  background-color: var(--color-white);
  color: var(--color-accent);
  font-weight: 500;
  box-shadow: var(--shadow-light);
}

/* --- 版块页 notice-box（shore） --- */
.notice-box {
  background-color: #fafcfb;
  border-left: 3px solid var(--color-warm);
}

.notice-box p {
  font-size: 14px;
  color: var(--color-text-main);
  margin-bottom: 10px;
  line-height: 1.7;
  padding-left: 8px;
  position: relative;
}

.notice-box p::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background-color: var(--color-warm);
}

/* --- 侧栏通用 --- */
.side-aside {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.aside-block,
.side-card,
.side-block,
.side-box,
.aside-box {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 20px;
}

.aside-title,
.side-title {
  font-size: 15px;
  font-weight: 500;
  color: var(--color-deep-green);
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-border);
}

/* 侧栏列表 */
.tips-list,
.aside-list,
.aside-nav-list,
.tip-list,
.neighbor-list,
.check-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.tips-list li,
.aside-list li,
.aside-nav-list li,
.tip-list li,
.neighbor-list li {
  font-size: 13px;
  line-height: 1.6;
  color: var(--color-text-main);
  padding-left: 16px;
  position: relative;
}

.tips-list li::before,
.aside-list li::before,
.tip-list li::before,
.neighbor-list li::before,
.aside-nav-list li::before {
  content: "·";
  position: absolute;
  left: 2px;
  color: var(--color-warm);
  font-weight: 700;
}

.aside-nav-list li a,
.neighbor-list li a,
.side-link-list li a {
  color: var(--color-accent);
  font-size: 13px;
}

/* 相邻版块 */
.adjacent-boards .adjacent-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.adjacent-list li a {
  display: inline-block;
  font-size: 13px;
  padding: 6px 12px;
  background-color: var(--color-bg-green);
  border-radius: var(--radius-small);
  color: var(--color-deep-green);
  transition: background-color var(--transition-base);
}

.adjacent-list li a:hover {
  background-color: var(--color-accent);
  color: var(--color-white);
}

/* --- shore 检查清单 --- */
.check-list {
  gap: 14px;
}

.check-list li {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  padding-left: 0;
  font-size: 14px;
}

.check-list li::before {
  display: none;
}

.check-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  border: 1px solid var(--color-accent);
  border-radius: 3px;
  margin-top: 3px;
  color: var(--color-accent);
  font-size: 12px;
  line-height: 1;
}

.check-icon::after {
  content: "✓";
}

/* --- tide 版块 --- */
.intro-section {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 24px;
  margin-bottom: 20px;
}

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

.content-section .topic-item {
  padding: 12px 0;
  border-bottom: 1px solid var(--color-border);
}

.content-section .topic-item:last-child {
  border-bottom: none;
}

.content-section .topic-title {
  font-size: 15px;
  font-weight: 500;
  color: var(--color-deep-green);
  margin-bottom: 4px;
}

.content-section .topic-excerpt {
  font-size: 13px;
  color: var(--color-text-light);
  margin: 0;
  line-height: 1.6;
}

.notice-section .notice-item {
  padding: 12px 0;
  border-bottom: 1px solid var(--color-border);
}

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

.notice-title {
  font-size: 15px;
  font-weight: 500;
  color: var(--color-deep-green);
  margin-bottom: 4px;
}

.notice-title::before {
  content: "⚠ ";
  color: var(--color-warm);
}

.notice-item p {
  font-size: 13px;
  color: var(--color-text-light);
  margin: 0;
  line-height: 1.6;
}

/* --- kitchen 版块 --- */
.section-block {
  margin-bottom: 20px;
}

.intro-section .intro-content {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  align-items: center;
}

@media (min-width: 640px) {
  .intro-section .intro-content {
    grid-template-columns: 1fr 1fr;
  }
}

.intro-text p {
  font-size: 15px;
  line-height: 1.75;
  color: var(--color-text-main);
  margin-bottom: 10px;
}

.intro-text p:last-child {
  margin-bottom: 0;
}

.intro-figure img {
  height: 220px;
  object-fit: cover;
}

.topic-section .topic-list {
  display: flex;
  flex-direction: column;
}

.topic-section .topic-list .topic-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 0;
}

.topic-section .topic-list .topic-item .topic-title {
  font-size: 15px;
  font-weight: 500;
  color: var(--color-deep-green);
  margin-bottom: 2px;
}

.topic-section .topic-list .topic-item .topic-summary {
  font-size: 13px;
  color: var(--color-text-light);
  line-height: 1.6;
}

.topic-section .topic-list .topic-item .topic-tag {
  align-self: flex-start;
  margin-top: 4px;
}

/* related */
.related-section {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 24px;
  margin-bottom: 20px;
}

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

.related-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.related-links a {
  display: inline-block;
  font-size: 13px;
  padding: 8px 16px;
  background-color: var(--color-bg-green);
  border-radius: var(--radius-small);
  color: var(--color-deep-green);
  transition: background-color var(--transition-base);
}

.related-links a:hover {
  background-color: var(--color-accent);
  color: var(--color-white);
}

/* --- guide 指南页 --- */
.guide-section {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 24px;
  margin-bottom: 20px;
}

.guide-section h2 {
  font-size: 18px;
  font-weight: 500;
  color: var(--color-deep-green);
  margin-bottom: 10px;
}

.guide-section .section-intro {
  font-size: 14px;
  color: var(--color-text-light);
  margin-bottom: 16px;
}

/* 版块地图 */
.board-map-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

@media (min-width: 640px) {
  .board-map-list {
    grid-template-columns: repeat(2, 1fr);
  }
}

.map-item {
  background-color: #fafcfb;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-small);
  padding: 14px 16px;
}

.map-item h3 {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-deep-green);
  margin-bottom: 4px;
}

.map-item h3::before {
  content: "▸ ";
  color: var(--color-warm);
}

.map-item p {
  font-size: 13px;
  color: var(--color-text-light);
  line-height: 1.6;
  margin: 0;
}

/* 推荐路线 */
.route-steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

@media (min-width: 640px) {
  .route-steps {
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
  }
}

.route-step {
  background-color: #fafcfb;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-small);
  padding: 18px 16px;
}

.route-step .step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background-color: var(--color-accent);
  color: var(--color-white);
  font-size: 14px;
  font-weight: 500;
  margin-bottom: 10px;
}

.route-step .step-body h3 {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-deep-green);
  margin-bottom: 6px;
}

.route-step .step-body p {
  font-size: 13px;
  color: var(--color-text-light);
  line-height: 1.6;
  margin: 0;
}

/* 准备清单 */
.ready-checklist {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
}

@media (min-width: 640px) {
  .ready-checklist {
    grid-template-columns: repeat(2, 1fr);
  }
}

.ready-checklist li {
  font-size: 14px;
  line-height: 1.6;
  color: var(--color-text-main);
  background-color: #fafcfb;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-small);
  padding: 12px 14px;
  display: flex;
  align-items: flex-start;
  gap: 8px;
}

.ready-checklist li::before {
  content: "☐";
  color: var(--color-accent);
  flex-shrink: 0;
}

/* FAQ 索引 */
.faq-index-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.faq-index-item {
  font-size: 14px;
  line-height: 1.6;
  padding: 10px 14px;
  background-color: #fafcfb;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-small);
}

.faq-index-item a {
  color: var(--color-accent);
  display: block;
}

/* guide 侧栏 */
.side-box p {
  font-size: 13px;
  color: var(--color-text-light);
  line-height: 1.6;
  margin-bottom: 12px;
}

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

.side-link-list li a {
  display: block;
  font-size: 14px;
  padding: 6px 0;
  color: var(--color-accent);
  border-bottom: 1px dashed var(--color-border);
}

.side-link-list li a:hover {
  color: var(--color-warm);
}

/* --- rules 规则页 --- */
.rule-section {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 24px;
  margin-bottom: 20px;
}

.rule-section h2 {
  font-size: 18px;
  font-weight: 500;
  color: var(--color-deep-green);
  margin-bottom: 10px;
}

.rule-section > p {
  font-size: 14px;
  color: var(--color-text-light);
  margin-bottom: 14px;
}

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

.rule-list li {
  font-size: 14px;
  line-height: 1.65;
  color: var(--color-text-main);
  padding-left: 20px;
  position: relative;
}

.rule-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 6px;
  height: 6px;
  background-color: var(--color-accent);
  border-radius: 1px;
}

/* 反馈步骤 */
.feedback-steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

@media (min-width: 640px) {
  .feedback-steps {
    grid-template-columns: repeat(2, 1fr);
  }
}

.feedback-step {
  background-color: #fafcfb;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-small);
  padding: 16px;
}

.feedback-step h3 {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-deep-green);
  margin-bottom: 4px;
}

.feedback-step h3::before {
  content: "① ";
  color: var(--color-warm);
}

.feedback-step p {
  font-size: 13px;
  color: var(--color-text-light);
  line-height: 1.6;
  margin: 0;
}

/* FAQ 折叠 */
.faq-section {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 24px;
  margin-bottom: 20px;
}

.faq-item {
  border-bottom: 1px solid var(--color-border);
  padding: 14px 0;
}

.faq-item:first-child {
  padding-top: 0;
}

.faq-item:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.faq-item summary {
  font-size: 15px;
  font-weight: 500;
  color: var(--color-deep-green);
  cursor: pointer;
  padding: 4px 0;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

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

.faq-item summary::after {
  content: "+";
  font-size: 18px;
  color: var(--color-accent);
  flex-shrink: 0;
  transition: transform var(--transition-base);
}

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

.faq-item p {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.7;
  margin: 8px 0 0;
  padding-right: 20px;
}

/* rules 页 figure */
.page-figure img {
  max-height: 220px;
}

/* ==========================================================
   7. 404 页面
   ========================================================== */

.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 60px 20px;
  flex: 1;
}

.error-panel {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 48px 32px;
  max-width: 560px;
  width: 100%;
  text-align: center;
}

.error-code {
  font-size: 64px;
  font-weight: 600;
  color: var(--color-bg-green);
  line-height: 1;
  text-shadow: 0 2px 0 var(--color-border);
  margin-bottom: 12px;
}

.error-title {
  font-size: 24px;
  font-weight: 500;
  color: var(--color-deep-green);
  margin-bottom: 12px;
}

.error-desc {
  font-size: 15px;
  color: var(--color-text-light);
  margin-bottom: 28px;
  text-align: left;
}

.error-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
  margin-bottom: 20px;
}

.error-home-btn {
  display: inline-block;
  background-color: var(--color-accent);
  color: var(--color-white);
  font-size: 14px;
  padding: 12px 24px;
  border-radius: var(--radius-card);
  transition: background-color var(--transition-base);
}

.error-home-btn:hover {
  background-color: var(--color-deep-green);
  color: var(--color-white);
}

.error-board-link {
  display: inline-block;
  background-color: var(--color-white);
  color: var(--color-accent);
  font-size: 14px;
  padding: 12px 24px;
  border-radius: var(--radius-card);
  border: 1px solid var(--color-accent);
  transition: background-color var(--transition-base), color var(--transition-base);
}

.error-board-link:hover {
  background-color: var(--color-bg-green);
  color: var(--color-deep-green);
}

.error-tip {
  font-size: 13px;
  color: var(--color-text-light);
  margin: 0;
}

/* ==========================================================
   8. 页脚
   ========================================================== */

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

.footer-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 36px 20px 24px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}

@media (min-width: 640px) {
  .footer-inner {
    grid-template-columns: 1.4fr 1fr;
    gap: 48px;
  }
}

.footer-brand {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-deep-green);
  margin-bottom: 8px;
}

.footer-desc {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 10px;
}

.footer-boundary {
  font-size: 13px;
  color: #94a29e;
  line-height: 1.6;
  margin: 0;
}

.footer-links-title {
  font-size: 15px;
  font-weight: 500;
  color: var(--color-deep-green);
  margin-bottom: 12px;
}

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

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

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

.footer-copy {
  border-top: 1px solid var(--color-border);
  margin: 0;
  padding: 16px 20px;
  text-align: center;
  font-size: 13px;
  color: #94a29e;
  background-color: #fafcfb;
}

/* ==========================================================
   9. Responsive — 响应式断点
   ========================================================== */

/* --- 1024px 以上：桌面双栏 --- */
@media (min-width: 1024px) {
  .inner-main {
    padding: 36px 0 72px;
  }

  .side-aside {
    position: sticky;
    top: 20px;
    align-self: start;
  }
}

/* --- 640px - 1023px：平板 --- */
@media (min-width: 640px) and (max-width: 1023px) {
  .page-title {
    font-size: 26px;
  }
}

/* --- 640px 以下：手机 --- */
@media (max-width: 639px) {
  /* 页头 */
  .header-inner {
    min-height: 56px;
    padding: 0 16px;
  }

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

  .nav-toggle {
    display: inline-flex;
  }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--color-white);
    border-bottom: 1px solid var(--color-border);
    box-shadow: 0 8px 16px rgba(65, 91, 87, 0.08);
  }

  .site-nav .nav-list {
    display: none;
    flex-direction: column;
    padding: 8px 16px 16px;
    gap: 2px;
  }

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

  .site-nav .nav-list li {
    width: 100%;
  }

  .site-nav .nav-list li a {
    padding: 12px 8px;
    font-size: 16px;
    border-radius: var(--radius-small);
  }

  .site-nav .nav-list li a.is-current {
    background-color: var(--color-bg-green);
  }

  .site-nav .nav-list li a.is-current::after {
    display: none;
  }

  /* 汉堡按钮状态 */
  .nav-toggle[aria-expanded="true"] .toggle-bar:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }

  .nav-toggle[aria-expanded="true"] .toggle-bar:nth-child(2) {
    opacity: 0;
  }

  .nav-toggle[aria-expanded="true"] .toggle-bar:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }

  /* 首页 */
  .home-hero {
    padding: 32px 16px 24px;
    gap: 20px;
  }

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

  .hero-slogan {
    font-size: 16px;
  }

  .hero-desc {
    font-size: 14px;
  }

  .hero-cta {
    width: 100%;
    text-align: center;
  }

  .board-nav,
  .topic-list,
  .notice-and-guide {
    padding-left: 16px;
    padding-right: 16px;
  }

  .topic-row {
    padding: 14px 16px;
  }

  /* 内页 */
  .inner-main {
    padding: 20px 0 48px;
  }

  .breadcrumb {
    padding: 0 16px 14px;
  }

  .inner-main .page-header {
    padding: 0 16px 20px;
  }

  .page-title {
    font-size: 22px;
  }

  .page-description {
    font-size: 14px;
  }

  .page-layout,
  .layout-shell {
    padding: 0 16px;
    gap: 20px;
  }

  /* 卡片内边距压缩 */
  .board-intro,
  .topic-section,
  .notice-box,
  .content-section,
  .section-block,
  .rule-section,
  .faq-section,
  .guide-section,
  .adjacent-boards,
  .related-section {
    padding: 18px;
  }

  /* 主题行 */
  .topic-row {
    flex-direction: column;
    gap: 4px;
  }

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

  .topic-title {
    font-size: 15px;
  }

  .topic-excerpt {
    font-size: 13px;
  }

  /* 侧栏在底部 */
  .side-aside {
    margin-top: 4px;
  }

  /* 404 */
  .error-panel {
    padding: 36px 20px;
  }

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

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

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

  .error-home-btn,
  .error-board-link {
    width: 100%;
    text-align: center;
  }
}

/* --- 小屏安全间距 --- */
@media (max-width: 360px) {
  .hero-title {
    font-size: 24px;
  }

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

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

/* ==========================================================
   10. 微交互增强（不影响初始可见性）
   ========================================================== */

/* 悬停过渡 */
@media (prefers-reduced-motion: no-preference) {
  .board-item,
  .entry-card,
  .topic-section,
  .board-intro {
    transition: border-color var(--transition-base),
      box-shadow var(--transition-base), transform 0.2s ease;
  }
}

/* 详情展开过渡 */
.faq-item p {
  animation: faq-fade 0.25s ease;
}

@keyframes faq-fade {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* 焦点可见性 */
a:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--color-warm);
  outline-offset: 2px;
}

/* 图片统一圆角 */
.board-figure img,
.content-figure img,
.intro-figure img,
.guide-figure img,
.page-figure img,
.hero-figure img,
.topic-figure img {
  background-color: var(--color-bg-green);
}

/* ==========================================================
   11. 页面级微调（仅业务内部，不覆盖全局骨架）
   ========================================================== */

/* guide 页：主栏在桌面更宽 */
.guide-page .layout-shell {
  grid-template-columns: minmax(0, 1fr) 260px;
}

/* rules 页：主栏顶部图 */
.rules-page .page-figure {
  margin-bottom: 20px;
}

.rules-page .page-figure img {
  max-height: 200px;
}

/* shore 页：两段主题之间的视觉分隔 */
.shore-page .topic-section + .topic-section {
  margin-top: 0;
}

/* kitchen：三组主题区块紧凑排列 */
.kitchen-page .section-block + .section-block {
  margin-top: 0;
}

/* tide：安全提醒与普通主题区分 */
.tide-page .notice-section {
  background-color: #fafcfb;
  border-left: 3px solid var(--color-warm);
}

/* lounge：版块图在简介下方 */
.lounge-page .board-figure {
  margin-top: 16px;
}

.lounge-page .board-figure img {
  max-height: 240px;
}

/* ==========================================================
   12. 打印基础
   ========================================================== */

@media print {
  .site-header,
  .site-footer,
  .side-aside,
  .nav-toggle {
    display: none;
  }

  body {
    background-color: var(--color-white);
  }

  .inner-main {
    padding: 0;
  }

  .page-layout,
  .layout-shell {
    max-width: none;
    padding: 0;
    display: block;
  }

  .main-wrap,
  .main-content {
    max-width: 100%;
  }

  .board-intro,
  .topic-section,
  .notice-box,
  .content-section,
  .section-block,
  .rule-section,
  .faq-section,
  .guide-section,
  .adjacent-boards,
  .related-section {
    border: none;
    padding: 16px 0;
  }
}