/* ============================================================
   糖心免费 · 全站样式表
   视觉方向：手工艺目录风（奶油纸底 / 墨绿 / 陶土色）
   ============================================================ */

/* ============================================================
   1. Base —— 重置、变量、全局基础
   ============================================================ */

:root {
  --paper: #f5efe6;
  --paper-deep: #ece3d4;
  --ink: #1f2a20;
  --ink-soft: #3d4a3a;
  --green: #2f3e2e;
  --green-soft: #4a5c48;
  --clay: #c46a4a;
  --clay-soft: #d98a6a;
  --line: #e3d5c0;
  --line-strong: #cdbb9f;
  --white: #fffdf9;
  --shadow-sm: 0 1px 3px rgba(31, 42, 32, 0.08);
  --shadow-md: 0 4px 14px rgba(31, 42, 32, 0.1);
  --radius: 8px;
  --radius-sm: 5px;
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-head: Georgia, "Times New Roman", "Songti SC", "SimSun", serif;
  --font-mono: "SF Mono", SFMono-Regular, Consolas, "Liberation Mono", Menlo, monospace;
  --container-w: 1200px;
  --header-h: 68px;
}

*,
*::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-body);
  font-size: 16px;
  line-height: 1.7;
  color: var(--ink);
  background-color: var(--paper);
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

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

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

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

ul,
ol {
  list-style: none;
}

h1,
h2,
h3,
h4,
h5 {
  font-family: var(--font-head);
  font-weight: 700;
  line-height: 1.35;
  color: var(--green);
}

h1 {
  font-size: 2rem;
  letter-spacing: 0.02em;
}

h2 {
  font-size: 1.5rem;
}

h3 {
  font-size: 1.15rem;
}

p {
  margin-bottom: 0.75rem;
}

figure {
  margin: 0;
}

figcaption {
  font-size: 0.85rem;
  color: var(--ink-soft);
  margin-top: 0.5rem;
  text-align: center;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ============================================================
   2. Layout —— 全站骨架、容器、栅格
   ============================================================ */

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

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

/* 全站统一页头 */
.site-header {
  background-color: var(--green);
  border-bottom: 3px solid var(--clay);
  position: sticky;
  top: 0;
  z-index: 100;
}

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

.brand-logo {
  font-family: var(--font-head);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--white);
  letter-spacing: 0.04em;
  white-space: nowrap;
  display: inline-flex;
  align-items: center;
}

.brand-logo::before {
  content: "◆";
  color: var(--clay-soft);
  margin-right: 8px;
  font-size: 0.9em;
}

.brand-logo:hover {
  color: var(--paper);
}

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

.site-nav .nav-list li a {
  display: inline-block;
  padding: 8px 14px;
  font-size: 0.95rem;
  color: rgba(255, 253, 249, 0.88);
  border-radius: var(--radius-sm);
  transition: background-color 0.2s ease, color 0.2s ease;
  white-space: nowrap;
}

.site-nav .nav-list li a:hover {
  background-color: rgba(255, 255, 255, 0.1);
  color: var(--white);
}

.site-nav .nav-list li a.is-current {
  background-color: var(--clay);
  color: var(--white);
  font-weight: 600;
}

/* 移动端汉堡按钮（桌面隐藏） */
.nav-toggle {
  display: none;
  background: none;
  border: 1px solid rgba(255, 255, 255, 0.4);
  border-radius: var(--radius-sm);
  width: 44px;
  height: 44px;
  cursor: pointer;
  position: relative;
  align-items: center;
  justify-content: center;
}

.nav-toggle-icon,
.nav-toggle-icon::before,
.nav-toggle-icon::after {
  content: "";
  display: block;
  width: 20px;
  height: 2px;
  background-color: var(--white);
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.nav-toggle-icon {
  top: 50%;
  transform: translate(-50%, -50%);
}

.nav-toggle-icon::before {
  top: -6px;
}

.nav-toggle-icon::after {
  top: 6px;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-icon {
  background-color: transparent;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-icon::before {
  top: 0;
  transform: translateX(-50%) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-icon::after {
  top: 0;
  transform: translateX(-50%) rotate(-45deg);
}

/* 页脚 */
.site-footer {
  background-color: var(--green);
  color: rgba(255, 253, 249, 0.85);
  margin-top: auto;
}

.footer-inner {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 48px 24px 24px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
}

.footer-col h3 {
  color: var(--white);
  font-size: 1.05rem;
  margin-bottom: 14px;
  position: relative;
  padding-bottom: 8px;
}

.footer-col h3::after {
  content: "";
  display: block;
  width: 28px;
  height: 2px;
  background-color: var(--clay);
  position: absolute;
  bottom: 0;
  left: 0;
}

.footer-col ul li {
  margin-bottom: 6px;
}

.footer-col ul li a {
  color: rgba(255, 253, 249, 0.75);
  font-size: 0.9rem;
  line-height: 1.6;
  word-break: break-word;
}

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

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  padding: 18px 24px;
  text-align: center;
}

.footer-bottom p {
  font-size: 0.85rem;
  color: rgba(255, 253, 249, 0.6);
  margin: 0;
}

/* 内页统一容器 */
.inner-main {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 32px 24px 64px;
}

/* 面包屑 */
.breadcrumb {
  font-size: 0.88rem;
  color: var(--ink-soft);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
}

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

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

.breadcrumb-sep {
  color: var(--line-strong);
  margin: 0 2px;
}

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

/* 页面标题区（内页统一） */
.page-header {
  margin-bottom: 36px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--line);
}

.page-title {
  font-size: 2rem;
  color: var(--green);
  margin-bottom: 10px;
}

.page-description {
  font-size: 1.05rem;
  color: var(--ink-soft);
  max-width: 720px;
  line-height: 1.7;
  margin: 0;
}

/* 内页布局容器 */
.layout-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: 40px;
  align-items: start;
}

.layout-shell .main-content {
  min-width: 0;
  min-width: 520px;
}

/* 侧栏（默认在右侧） */
.sidebar-help,
.sidebar-area,
.help-sidebar {
  min-width: 0;
}

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

/* 按钮 */
.btn-primary,
.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 26px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  transition: background-color 0.2s ease, color 0.2s ease,
    box-shadow 0.2s ease, transform 0.2s ease;
  cursor: pointer;
}

.btn-primary {
  background-color: var(--clay);
  color: var(--white);
  border: 1px solid var(--clay);
}

.btn-primary:hover {
  background-color: #b05a3c;
  color: var(--white);
  box-shadow: var(--shadow-sm);
  transform: translateY(-1px);
}

.btn-secondary {
  background-color: transparent;
  color: var(--green);
  border: 1px solid var(--green);
}

.btn-secondary:hover {
  background-color: var(--green);
  color: var(--white);
}

/* 区块标题（内页 section 标题） */
.section-title {
  font-size: 1.35rem;
  margin-bottom: 16px;
  color: var(--green);
}

.section-desc {
  color: var(--ink-soft);
  margin-bottom: 20px;
  max-width: 680px;
}

/* 筛选标签 */
.filter-bar {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 20px;
}

.filter-label {
  font-weight: 600;
  color: var(--green);
  margin-right: 4px;
  font-size: 0.92rem;
}

.filter-chip {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 6px 18px;
  background-color: transparent;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  font-size: 0.88rem;
  color: var(--ink-soft);
  cursor: pointer;
  transition: all 0.2s ease;
  font-family: var(--font-body);
}

.filter-chip:hover {
  border-color: var(--green);
  color: var(--green);
}

.filter-chip.is-active {
  background-color: var(--green);
  border-color: var(--green);
  color: var(--white);
  font-weight: 600;
}

/* 折叠问答 */
.faq-item {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background-color: var(--white);
  margin-bottom: 12px;
  overflow: hidden;
}

.faq-item summary {
  padding: 16px 20px;
  font-size: 1rem;
  font-weight: 600;
  color: var(--green);
  cursor: pointer;
  list-style: none;
  position: relative;
  padding-right: 48px;
  transition: background-color 0.2s ease;
  display: flex;
  align-items: center;
}

.faq-item summary::after {
  content: "+";
  position: absolute;
  right: 18px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.3rem;
  font-weight: 400;
  color: var(--clay);
  transition: transform 0.2s ease;
}

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

.faq-item summary:hover {
  background-color: var(--paper);
}

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

.faq-item > p {
  padding: 0 20px 16px;
  color: var(--ink-soft);
  margin: 0;
}

.faq-item > p a {
  color: var(--clay);
  font-weight: 600;
}

/* 侧栏帮助卡片 */
.help-card,
.sidebar-card,
.help-module {
  background-color: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 20px;
}

.help-card h2,
.sidebar-card h2,
.help-module h2 {
  font-size: 1.05rem;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--line);
  color: var(--green);
}

.help-card p,
.sidebar-card p {
  font-size: 0.9rem;
  color: var(--ink-soft);
  margin-bottom: 10px;
}

.help-card a,
.sidebar-card a,
.help-module a {
  font-size: 0.9rem;
  color: var(--green);
  font-weight: 600;
}

.help-card a:hover,
.sidebar-card a:hover,
.help-module a:hover {
  color: var(--clay);
}

.help-card ul,
.sidebar-card ul,
.help-module ul {
  margin-top: 6px;
}

.help-card ul li,
.sidebar-card ul li,
.help-module ul li {
  margin-bottom: 8px;
  padding-left: 14px;
  position: relative;
}

.help-card ul li::before,
.sidebar-card ul li::before,
.help-module ul li::before {
  content: "›";
  position: absolute;
  left: 0;
  color: var(--clay);
  font-weight: 700;
}

/* 图片约束 */
.content-media img,
.channel-media img,
.item-media img,
.preview-figure img,
.guide-figure img,
.hero-figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ============================================================
   4. Pages —— 各页面业务模块
   ============================================================ */

/* ---------- 首页 ---------- */

/* Hero 首屏 */
.hero-section {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 56px 24px 48px;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
}

.hero-copy h1 {
  font-size: 2.4rem;
  margin-bottom: 16px;
  color: var(--green);
  line-height: 1.3;
}

.hero-lead {
  font-size: 1.1rem;
  color: var(--ink-soft);
  margin-bottom: 28px;
  max-width: 520px;
}

.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

.hero-figure {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--line);
  box-shadow: var(--shadow-md);
  background-color: var(--white);
  aspect-ratio: 4 / 3;
}

.hero-figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* 四入口快捷条 */
.quick-links-section {
  background-color: var(--paper-deep);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.quick-links-grid {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 32px 24px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.quick-link-card {
  background-color: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px 20px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  transition: transform 0.2s ease, box-shadow 0.2s ease,
    border-color 0.2s ease;
}

.quick-link-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: var(--line-strong);
}

.quick-link-label {
  font-family: var(--font-head);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--green);
}

.quick-link-label::before {
  content: "◆ ";
  color: var(--clay);
  font-size: 0.8em;
}

.quick-link-desc {
  font-size: 0.88rem;
  color: var(--ink-soft);
  line-height: 1.6;
}

/* 定位说明带 */
.intro-band {
  max-width: 860px;
  margin: 0 auto;
  padding: 48px 24px;
  text-align: center;
}

.intro-band p {
  font-size: 1.05rem;
  color: var(--ink-soft);
  line-height: 1.8;
  margin-bottom: 12px;
}

.intro-band p a {
  color: var(--clay);
  font-weight: 600;
  border-bottom: 1px solid var(--clay-soft);
}

/* 搜索式内容总览 */
.catalog-shell {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 0 24px 56px;
}

.catalog-shell > h2 {
  font-size: 1.6rem;
  margin-bottom: 20px;
  color: var(--green);
}

.catalog-shell .filter-bar {
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line);
}

.result-count {
  font-size: 0.9rem;
  color: var(--ink-soft);
  margin: 16px 0 20px;
}

.result-count::before {
  content: "共 ";
}

.result-count::after {
  content: " 条内容";
}

.catalog-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.catalog-item {
  background-color: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.catalog-item:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.item-media {
  aspect-ratio: 16 / 9;
  background-color: var(--paper-deep);
  overflow: hidden;
}

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

.item-content {
  padding: 18px 20px;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.item-content h3 {
  font-size: 1.1rem;
  margin-bottom: 8px;
  color: var(--green);
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.item-number {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--clay);
  font-weight: 700;
  letter-spacing: 0.02em;
}

.item-content > p {
  font-size: 0.9rem;
  color: var(--ink-soft);
  margin-bottom: 10px;
  flex: 1;
}

.item-meta {
  font-size: 0.82rem;
  color: var(--ink-soft);
  margin-bottom: 12px;
  padding-top: 10px;
  border-top: 1px dashed var(--line);
}

.item-content > a {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--clay);
  align-self: flex-start;
}

.item-content > a::after {
  content: " →";
}

/* 观看指南案例区 */
.guide-case {
  background-color: var(--paper-deep);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.guide-case > h2 {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 48px 24px 8px;
  font-size: 1.6rem;
  color: var(--green);
}

.case-steps {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 24px 24px 24px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.case-step {
  background-color: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px 20px;
  position: relative;
  min-height: 160px;
}

.case-step .step-number {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--clay);
  margin-bottom: 10px;
  line-height: 1;
}

.case-step p {
  font-size: 0.9rem;
  color: var(--ink-soft);
  margin: 0;
}

.guide-more {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 0 24px 48px;
  text-align: center;
}

.guide-more a {
  color: var(--clay);
  font-weight: 600;
  border-bottom: 1px solid var(--clay-soft);
}

/* 首页 FAQ 预览 */
.faq-preview {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 56px 24px 24px;
}

.faq-preview > h2 {
  font-size: 1.6rem;
  margin-bottom: 20px;
  color: var(--green);
}

/* 反馈说明条 */
.feedback-note {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 32px 24px 56px;
  text-align: center;
}

.feedback-note p {
  font-size: 0.95rem;
  color: var(--ink-soft);
  max-width: 640px;
  margin: 0 auto;
}

.feedback-note p a {
  color: var(--clay);
  font-weight: 600;
  border-bottom: 1px solid var(--clay-soft);
}

/* ---------- 频道分类页 ---------- */

.page-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: 40px;
  align-items: start;
}

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

/* 频道筛选（内页频道分类） */
.filter-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 24px;
}

.filter-tag {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 6px 18px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  font-size: 0.88rem;
  color: var(--ink-soft);
  transition: all 0.2s ease;
  background-color: var(--white);
}

.filter-tag:hover {
  border-color: var(--green);
  color: var(--green);
}

.filter-tag.is-active {
  background-color: var(--green);
  border-color: var(--green);
  color: var(--white);
  font-weight: 600;
}

/* 频道条目 */
.channel-list {
  margin-bottom: 40px;
}

.channel-item {
  display: grid;
  grid-template-columns: 180px minmax(0, 1fr);
  gap: 24px;
  background-color: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 20px;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.channel-item:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.channel-media {
  border-radius: var(--radius-sm);
  overflow: hidden;
  aspect-ratio: 3 / 2;
  background-color: var(--paper-deep);
}

.channel-media figure {
  width: 100%;
  height: 100%;
}

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

.channel-number {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--clay);
  font-weight: 700;
  display: block;
  margin-bottom: 4px;
}

.channel-content h3 {
  font-size: 1.2rem;
  margin-bottom: 8px;
  color: var(--green);
}

.channel-desc {
  font-size: 0.92rem;
  color: var(--ink-soft);
  margin-bottom: 8px;
}

.channel-audience,
.channel-path {
  font-size: 0.85rem;
  color: var(--ink-soft);
  margin-bottom: 6px;
  padding-left: 14px;
  position: relative;
}

.channel-audience::before,
.channel-path::before {
  content: "·";
  position: absolute;
  left: 0;
  color: var(--clay);
  font-weight: 700;
}

/* 相关专题推荐 */
.related-topics {
  margin-bottom: 40px;
}

.topic-cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.topic-cards .topic-card {
  background-color: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  display: block;
}

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

.topic-cards .topic-card h3 {
  font-size: 1.05rem;
  margin-bottom: 6px;
  color: var(--green);
}

.topic-cards .topic-card h3::before {
  content: "◆ ";
  color: var(--clay);
  font-size: 0.8em;
}

.topic-cards .topic-card p {
  font-size: 0.85rem;
  color: var(--ink-soft);
  margin: 0;
}

/* ---------- 专题片库页 ---------- */

.topic-list {
  margin-bottom: 40px;
}

.topic-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.topic-grid .topic-card {
  background-color: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.topic-grid .topic-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.topic-card-header {
  display: flex;
  align-items: baseline;
  gap: 10px;
  border-bottom: 1px solid var(--line);
  padding-bottom: 12px;
}

.topic-number {
  font-family: var(--font-mono);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--clay);
  line-height: 1;
}

.topic-name {
  font-size: 1.2rem;
  color: var(--green);
}

.topic-reason,
.topic-audience {
  font-size: 0.88rem;
  color: var(--ink-soft);
  margin: 0;
}

.topic-reason strong,
.topic-audience strong {
  color: var(--green);
  font-weight: 600;
  margin-right: 4px;
}

.topic-preview {
  margin-top: auto;
  background-color: var(--paper);
  border-radius: var(--radius-sm);
  padding: 14px;
}

.preview-title {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--green);
  margin-bottom: 8px;
}

.preview-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.preview-item {
  font-size: 0.82rem;
  color: var(--ink-soft);
  display: flex;
  align-items: center;
  gap: 6px;
}

.preview-item::before {
  content: "▸";
  color: var(--clay);
  font-size: 0.9rem;
}

/* 专题预览说明 */
.topic-preview-note {
  margin-bottom: 40px;
}

.preview-figure {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--line);
  aspect-ratio: 16 / 7;
  background-color: var(--paper-deep);
}

.preview-figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* 频道入口 */
.channel-link {
  margin-bottom: 40px;
}

.link-card {
  display: block;
  background-color: var(--green);
  color: var(--white);
  border-radius: var(--radius);
  padding: 24px 28px;
  transition: background-color 0.2s ease, transform 0.2s ease;
}

.link-card:hover {
  background-color: var(--green-soft);
  color: var(--white);
  transform: translateY(-2px);
}

.link-card::after {
  content: " →";
  color: var(--clay-soft);
}

/* 相关链接行 */
.related-links {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  padding: 16px 0;
  border-top: 1px solid var(--line);
}

.related-links-label {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--green);
}

.related-links-item {
  font-size: 0.88rem;
  color: var(--clay);
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  padding: 4px 14px;
  transition: all 0.2s ease;
}

.related-links-item:hover {
  background-color: var(--clay);
  color: var(--white);
  border-color: var(--clay);
}

/* ---------- 糖心免费版页 ---------- */

.page-title-area {
  margin-bottom: 0;
}

.version-table {
  margin-bottom: 40px;
}

.content-media-inline {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--line);
  aspect-ratio: 16 / 6;
  background-color: var(--paper-deep);
  margin-bottom: 20px;
}

.content-media-inline img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.table-compare {
  width: 100%;
  border-collapse: collapse;
  background-color: var(--white);
  border-radius: var(--radius);
  overflow: hidden;
  font-size: 0.92rem;
}

.table-compare thead th {
  background-color: var(--green);
  color: var(--white);
  text-align: left;
  padding: 12px 16px;
  font-weight: 600;
  font-size: 0.9rem;
}

.table-compare tbody td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--line);
  color: var(--ink-soft);
  vertical-align: top;
}

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

.table-compare tbody tr:nth-child(even) {
  background-color: var(--paper);
}

.table-note {
  font-size: 0.85rem;
  color: var(--ink-soft);
  margin-top: 12px;
  margin-bottom: 0;
}

/* 场景列表 */
.scene-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.scene-item {
  background-color: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px 20px;
}

.scene-item h3 {
  font-size: 1.05rem;
  margin-bottom: 10px;
  color: var(--green);
  padding-bottom: 8px;
  border-bottom: 1px dashed var(--line);
}

.scene-item h3::before {
  content: "◆ ";
  color: var(--clay);
  font-size: 0.8em;
}

.scene-item p {
  font-size: 0.88rem;
  color: var(--ink-soft);
  margin-bottom: 8px;
}

/* 指南入口卡 */
.guide-card-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.guide-card {
  display: block;
  background-color: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

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

.guide-card h3 {
  font-size: 1.05rem;
  margin-bottom: 6px;
  color: var(--green);
}

.guide-card h3::after {
  content: " →";
  color: var(--clay);
}

.guide-card p {
  font-size: 0.85rem;
  color: var(--ink-soft);
  margin: 0;
}

/* 侧栏帮助模块 */
.help-module {
  background-color: var(--white);
}

.help-links {
  margin-top: 4px;
}

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

.help-links li a {
  font-size: 0.9rem;
  color: var(--green);
  font-weight: 600;
  padding-left: 12px;
  position: relative;
}

.help-links li a::before {
  content: "›";
  position: absolute;
  left: 0;
  color: var(--clay);
  font-weight: 700;
}

/* ---------- 观看指南页 ---------- */

.page-title-block {
  margin-bottom: 0;
}

.anchor-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 28px;
  padding: 12px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.anchor-nav a {
  font-size: 0.88rem;
  color: var(--green);
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  padding: 5px 16px;
  transition: all 0.2s ease;
}

.anchor-nav a:hover {
  background-color: var(--green);
  color: var(--white);
  border-color: var(--green);
}

.guide-section {
  margin-bottom: 36px;
  scroll-margin-top: calc(var(--header-h) + 20px);
}

.guide-section h2 {
  font-size: 1.35rem;
  margin-bottom: 14px;
  color: var(--green);
}

.guide-section h2::before {
  content: "◆ ";
  color: var(--clay);
  font-size: 0.8em;
}

.guide-section > p {
  color: var(--ink-soft);
  margin-bottom: 12px;
}

/* 挑战列表 */
.challenge-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.challenge-list li {
  background-color: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 14px 18px;
}

.challenge-list li h3 {
  font-size: 1rem;
  margin-bottom: 4px;
  color: var(--green);
}

.challenge-list li h3::before {
  content: "· ";
  color: var(--clay);
  font-weight: 700;
}

.challenge-list li p {
  font-size: 0.88rem;
  color: var(--ink-soft);
  margin: 0;
}

/* 步骤列表 */
.guide-section .step-item {
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr);
  gap: 16px;
  margin-bottom: 16px;
  background-color: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px;
}

.step-num {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background-color: var(--green);
  color: var(--white);
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}

.step-content h3 {
  font-size: 1.05rem;
  margin-bottom: 6px;
  color: var(--green);
}

.step-content p {
  font-size: 0.9rem;
  color: var(--ink-soft);
  margin: 0;
}

/* 结果图片 */
.guide-figure {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--line);
  aspect-ratio: 16 / 6;
  background-color: var(--paper-deep);
  margin-top: 16px;
}

.guide-figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ---------- 入口核验页 ---------- */

.entry-types {
  margin-bottom: 36px;
}

.entry-types > p {
  color: var(--ink-soft);
  margin-bottom: 16px;
}

.entry-type-item {
  background-color: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 20px;
  margin-bottom: 12px;
}

.entry-type-item h3 {
  font-size: 1.05rem;
  margin-bottom: 6px;
  color: var(--green);
}

.entry-type-item h3::before {
  content: "◆ ";
  color: var(--clay);
  font-size: 0.8em;
}

.entry-type-item p {
  font-size: 0.88rem;
  color: var(--ink-soft);
  margin: 0;
}

/* 核验步骤 */
.check-steps {
  margin-bottom: 36px;
}

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

.step-list .step-item {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 14px;
  background-color: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px 18px;
  align-items: start;
}

.step-list .step-number {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background-color: var(--clay);
  color: var(--white);
  font-family: var(--font-mono);
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.95rem;
}

.step-content p {
  font-size: 0.88rem;
  color: var(--ink-soft);
  margin: 0;
}

/* 异常处理 */
.exception-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.exception-card {
  background-color: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px;
}

.exception-card h3 {
  font-size: 1rem;
  margin-bottom: 8px;
  color: var(--green);
}

.exception-card h3::before {
  content: "! ";
  color: var(--clay);
  font-weight: 700;
}

.exception-card p {
  font-size: 0.85rem;
  color: var(--ink-soft);
  margin: 0;
}

/* 回到频道入口 */
.back-links {
  margin-top: 36px;
}

.back-link-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.back-link-card {
  display: block;
  background-color: var(--green);
  border-radius: var(--radius);
  padding: 20px 22px;
  color: var(--white);
  transition: background-color 0.2s ease, transform 0.2s ease;
}

.back-link-card:hover {
  background-color: var(--green-soft);
  color: var(--white);
  transform: translateY(-2px);
}

.back-link-title {
  display: block;
  font-family: var(--font-head);
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 4px;
}

.back-link-title::after {
  content: " →";
  color: var(--clay-soft);
}

.back-link-desc {
  display: block;
  font-size: 0.85rem;
  color: rgba(255, 253, 249, 0.8);
}

/* ---------- 常见问题页 ---------- */

.content-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: 40px;
  align-items: start;
}

.faq-groups {
  margin-bottom: 32px;
}

.group-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 24px;
}

.group-tag {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 6px 16px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  font-size: 0.88rem;
  color: var(--ink-soft);
  transition: all 0.2s ease;
  background-color: var(--white);
}

.group-tag:hover {
  border-color: var(--green);
  color: var(--green);
}

.faq-group {
  margin-bottom: 28px;
}

.faq-group-title {
  font-size: 1.1rem;
  margin-bottom: 12px;
  color: var(--green);
  padding-left: 12px;
  border-left: 3px solid var(--clay);
}

/* 相关页面入口 */
.related-card-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.related-card {
  display: block;
  background-color: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 20px;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

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

.related-card-title {
  display: block;
  font-family: var(--font-head);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--green);
  margin-bottom: 4px;
}

.related-card-title::after {
  content: " →";
  color: var(--clay);
}

.related-card-desc {
  display: block;
  font-size: 0.85rem;
  color: var(--ink-soft);
}

/* ---------- 404 页 ---------- */

.error-main {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 64px 24px;
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
}

.error-panel {
  text-align: center;
  max-width: 540px;
  padding: 48px 40px;
  background-color: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.error-code {
  font-family: var(--font-mono);
  font-size: 3rem;
  font-weight: 700;
  color: var(--clay);
  margin-bottom: 8px;
  line-height: 1;
}

.error-panel h1 {
  font-size: 1.6rem;
  margin-bottom: 12px;
  color: var(--green);
}

.error-desc {
  font-size: 0.95rem;
  color: var(--ink-soft);
  margin-bottom: 24px;
}

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

.error-help {
  font-size: 0.88rem;
  color: var(--ink-soft);
  margin: 0;
}

.error-help a {
  color: var(--clay);
  font-weight: 600;
}

/* ============================================================
   5. Responsive —— 响应式
   ============================================================ */

/* 平板及以下 */
@media (max-width: 1024px) {
  .quick-links-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

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

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

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

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

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

/* 手机端 */
@media (max-width: 768px) {
  /* 页头 */
  .header-inner {
    padding: 0 16px;
    height: 60px;
  }

  .brand-logo {
    font-size: 1.2rem;
  }

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: absolute;
    top: 60px;
    left: 0;
    right: 0;
    background-color: var(--green);
    border-top: 1px solid rgba(255, 255, 255, 0.15);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.2);
  }

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

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

  .site-nav .nav-list li a {
    display: block;
    padding: 12px 14px;
    font-size: 1rem;
    border-radius: var(--radius-sm);
  }

  /* 页脚 */
  .footer-inner {
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    padding: 32px 16px 16px;
  }

  .footer-bottom {
    padding: 14px 16px;
  }

  /* 内页 */
  .inner-main {
    padding: 20px 16px 48px;
  }

  .page-header {
    margin-bottom: 24px;
  }

  .page-title {
    font-size: 1.6rem;
  }

  /* 布局切换为单列 */
  .layout-shell,
  .page-layout,
  .content-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .layout-shell .main-content,
  .content-grid .main-content {
    min-width: 0;
  }

  /* 侧栏在正文后 */
  .sidebar-help,
  .sidebar-area,
  .help-sidebar {
    margin-top: 8px;
  }

  /* 首页 Hero */
  .hero-section {
    grid-template-columns: 1fr;
    gap: 24px;
    padding: 32px 16px 32px;
  }

  .hero-copy h1 {
    font-size: 1.8rem;
  }

  .hero-lead {
    font-size: 1rem;
  }

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

  .hero-actions .btn-primary,
  .hero-actions .btn-secondary {
    width: 100%;
  }

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

  /* 首页快捷入口 */
  .quick-links-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
    padding: 24px 16px;
  }

  .quick-link-card {
    padding: 16px 14px;
  }

  .quick-link-label {
    font-size: 1rem;
  }

  .quick-link-desc {
    font-size: 0.82rem;
  }

  /* 首页目录 */
  .catalog-shell {
    padding: 0 16px 40px;
  }

  .catalog-list {
    grid-template-columns: 1fr;
    gap: 14px;
  }

  /* 首页案例 */
  .guide-case > h2 {
    padding: 32px 16px 4px;
  }

  .case-steps {
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    padding: 16px 16px 8px;
  }

  .case-step {
    padding: 16px 14px;
    min-height: 0;
  }

  .case-step .step-number {
    font-size: 1.4rem;
  }

  .guide-more {
    padding: 0 16px 32px;
  }

  /* 首页 FAQ */
  .faq-preview {
    padding: 32px 16px 16px;
  }

  .feedback-note {
    padding: 24px 16px 40px;
  }

  /* 频道分类页 */
  .channel-item {
    grid-template-columns: 1fr;
    gap: 14px;
    padding: 16px;
  }

  .channel-media {
    aspect-ratio: 16 / 9;
    max-height: 200px;
  }

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

  /* 专题页 */
  .topic-grid {
    grid-template-columns: 1fr;
    gap: 14px;
  }

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

  .link-card {
    padding: 18px 20px;
  }

  /* 版本页 */
  .scene-grid {
    grid-template-columns: 1fr;
    gap: 14px;
  }

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

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

  .table-compare {
    font-size: 0.82rem;
  }

  .table-compare thead th,
  .table-compare tbody td {
    padding: 10px 12px;
  }

  /* 观看指南 */
  .anchor-nav {
    gap: 6px;
    margin-bottom: 20px;
  }

  .anchor-nav a {
    padding: 4px 12px;
    font-size: 0.82rem;
  }

  .guide-section .step-item {
    grid-template-columns: 40px minmax(0, 1fr);
    gap: 12px;
    padding: 14px;
  }

  .step-num {
    width: 36px;
    height: 36px;
    font-size: 0.95rem;
  }

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

  /* 入口核验 */
  .exception-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .back-link-grid {
    grid-template-columns: 1fr;
  }

  .step-list .step-item {
    grid-template-columns: 36px minmax(0, 1fr);
    gap: 12px;
    padding: 14px;
  }

  .step-list .step-number {
    width: 32px;
    height: 32px;
    font-size: 0.85rem;
  }

  /* 常见问题 */
  .related-card-list {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .faq-item summary {
    padding: 14px 44px 14px 16px;
    font-size: 0.95rem;
  }

  .faq-item > p {
    padding: 0 16px 14px;
  }

  /* 404 */
  .error-main {
    padding: 40px 16px;
  }

  .error-panel {
    padding: 32px 20px;
  }

  .error-code {
    font-size: 2.4rem;
  }

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

  .error-actions .btn-primary,
  .error-actions .btn-secondary {
    width: 100%;
  }
}

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

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

  .footer-inner {
    grid-template-columns: 1fr 1fr;
    gap: 20px 16px;
  }

  .footer-col h3 {
    font-size: 0.95rem;
  }

  .footer-col ul li a {
    font-size: 0.82rem;
  }

  .table-compare {
    font-size: 0.78rem;
  }

  .table-compare thead th,
  .table-compare tbody td {
    padding: 8px 10px;
  }
}