/* =========================================================
   糖心vlog · 整站样式表
   版本：1.0
   说明：覆盖首页、频道中心、题材指南、观看场景、
         内容百科、帮助与反馈、404 页全部 DOM 结构
   ========================================================= */

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

:root {
  --color-dark: #1b1e24;
  --color-dark-soft: #24292f;
  --color-light: #f7f7f2;
  --color-accent: #e05a3c;
  --color-accent-soft: #f4a08c;
  --color-teal: #2f7d70;
  --color-teal-soft: #4a9c8e;
  --color-text: #24292f;
  --color-text-secondary: #6a737d;
  --color-border: #d9d9d0;
  --color-white: #ffffff;
  --font-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  --container-width: 1200px;
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --shadow-card: 0 2px 6px rgba(27, 30, 36, 0.08);
  --shadow-hover: 0 4px 14px rgba(27, 30, 36, 0.14);
  --header-height: 68px;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  color: var(--color-text);
  background-color: var(--color-light);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

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

ul,
ol {
  list-style: none;
}

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

h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 700;
  line-height: 1.35;
  color: var(--color-dark-soft);
}

p {
  margin-bottom: 0.75em;
}

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

/* =========================================================
   2. layout —— 页头、页脚、主容器、面包屑
   ========================================================= */

.site-header {
  background-color: var(--color-dark);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  position: sticky;
  top: 0;
  z-index: 100;
}

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

.brand-logo {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
  flex-shrink: 0;
}

.brand-name {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-white);
  letter-spacing: 1px;
}

.brand-tagline {
  font-size: 12px;
  color: rgba(255, 255, 255, 0.5);
  margin-top: 2px;
}

.site-nav {
  display: block;
}

.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, 0.75);
  border-radius: var(--radius-sm);
  transition: color 0.2s ease, background-color 0.2s ease;
}

.nav-list li a:hover {
  color: var(--color-white);
  background-color: rgba(255, 255, 255, 0.08);
}

.nav-list li a.is-current {
  color: var(--color-white);
  background-color: rgba(255, 255, 255, 0.12);
  font-weight: 600;
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  width: 44px;
  height: 44px;
  padding: 10px;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  align-items: center;
}

.nav-toggle-bar {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-white);
  border-radius: 2px;
  transition: transform 0.25s ease, opacity 0.25s ease;
}

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

.inner-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 32px 24px 64px;
}

.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-bottom: 24px;
}

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

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

.breadcrumb-sep {
  color: var(--color-text-secondary);
  opacity: 0.6;
}

.breadcrumb-current {
  color: var(--color-text-secondary);
  font-weight: 500;
}

.page-header {
  margin-bottom: 36px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--color-border);
}

.page-title {
  font-size: 28px;
  font-weight: 700;
  color: var(--color-dark-soft);
  margin-bottom: 10px;
  line-height: 1.3;
}

.page-description {
  font-size: 16px;
  color: var(--color-text-secondary);
  max-width: 780px;
  line-height: 1.75;
}

.site-footer {
  background-color: var(--color-white);
  border-top: 1px solid var(--color-border);
  padding: 48px 24px 24px;
  margin-top: 0;
}

.footer-columns {
  max-width: var(--container-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 40px;
  padding-bottom: 36px;
}

.footer-col h3 {
  font-size: 15px;
  font-weight: 700;
  color: var(--color-dark-soft);
  margin-bottom: 14px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-border);
}

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

.footer-col ul li a {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  transition: color 0.2s ease;
}

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

.footer-bottom {
  max-width: var(--container-width);
  margin: 0 auto;
  padding-top: 20px;
  border-top: 1px solid var(--color-border);
  text-align: center;
}

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

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

/* --- 区块标题 --- */

.section-heading {
  max-width: var(--container-width);
  margin: 0 auto 28px;
}

.section-heading h2 {
  font-size: 24px;
  font-weight: 700;
  color: var(--color-dark-soft);
  margin-bottom: 6px;
}

.section-heading p {
  font-size: 15px;
  color: var(--color-text-secondary);
  max-width: 720px;
}

.section-title {
  font-size: 24px;
  font-weight: 700;
  color: var(--color-dark-soft);
  margin-bottom: 6px;
}

/* --- 频道卡片 --- */

.channel-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: box-shadow 0.25s ease, transform 0.25s ease;
}

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

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

.channel-card h3 {
  font-size: 18px;
  font-weight: 700;
  padding: 16px 16px 4px;
}

.card-meta {
  font-size: 14px;
  color: var(--color-accent);
  padding: 0 16px;
  margin-bottom: 4px;
  font-weight: 500;
}

.card-audience {
  font-size: 14px;
  color: var(--color-text-secondary);
  padding: 0 16px 16px;
  line-height: 1.6;
}

/* --- 属性表 --- */

.attr-table {
  width: 100%;
  font-size: 14px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.attr-table tbody tr {
  border-bottom: 1px solid var(--color-border);
}

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

.attr-table td {
  padding: 8px 12px;
  line-height: 1.6;
}

.attr-table td:first-child {
  background-color: rgba(47, 125, 112, 0.08);
  font-weight: 600;
  color: var(--color-dark-soft);
  width: 32%;
  min-width: 90px;
}

.attr-table td:last-child {
  color: var(--color-text);
}

/* --- 标签列表 --- */

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.tag-list li a {
  display: inline-block;
  padding: 6px 14px;
  font-size: 14px;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  color: var(--color-text);
  transition: border-color 0.2s ease, color 0.2s ease, background-color 0.2s ease;
}

.tag-list li a:hover {
  border-color: var(--color-teal);
  color: var(--color-teal);
  background-color: rgba(47, 125, 112, 0.06);
}

/* --- 通用横幅 --- */

.help-notice {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 24px 32px;
  background-color: var(--color-dark);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}

.help-notice p {
  color: rgba(255, 255, 255, 0.85);
  font-size: 15px;
  margin: 0;
  flex: 1;
  min-width: 260px;
}

.help-notice a {
  color: var(--color-white);
  background-color: var(--color-accent);
  padding: 10px 24px;
  border-radius: var(--radius-md);
  font-size: 15px;
  font-weight: 600;
  display: inline-block;
  transition: background-color 0.2s ease;
}

.help-notice a:hover {
  background-color: #c94a2e;
}

/* --- 相关链接 --- */

.related-links {
  max-width: var(--container-width);
  margin: 40px auto 0;
  padding-top: 20px;
  border-top: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

.related-links-label {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text-secondary);
}

.related-links-item {
  font-size: 14px;
  color: var(--color-teal);
  padding: 6px 14px;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  transition: border-color 0.2s ease, color 0.2s ease;
}

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

/* --- 折叠面板 --- */

.faq-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background-color: var(--color-white);
  overflow: hidden;
}

.faq-item summary {
  padding: 14px 18px;
  font-size: 15px;
  font-weight: 600;
  color: var(--color-dark-soft);
  cursor: pointer;
  list-style: none;
  position: relative;
  transition: background-color 0.2s ease;
}

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

.faq-item summary::after {
  content: "+";
  position: absolute;
  right: 18px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 20px;
  color: var(--color-teal);
  font-weight: 400;
}

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

.faq-item summary:hover {
  background-color: rgba(47, 125, 112, 0.04);
}

.faq-item p {
  padding: 0 18px 16px;
  font-size: 14px;
  color: var(--color-text);
  line-height: 1.7;
  margin: 0;
}

/* =========================================================
   4. pages —— 首页
   ========================================================= */

.home-main {
  background-color: var(--color-light);
}

/* --- 首屏 hero --- */

.hero-section {
  background-color: var(--color-dark);
  padding: 56px 0 64px;
}

.hero-layout {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 48px;
  align-items: start;
}

.hero-index {
  background-color: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-lg);
  padding: 24px 20px;
}

.index-title {
  font-size: 14px;
  font-weight: 700;
  color: rgba(255, 255, 255, 0.5);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 18px;
  padding-bottom: 12px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.index-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.index-list li a {
  display: block;
  padding: 10px 12px;
  font-size: 15px;
  color: rgba(255, 255, 255, 0.75);
  border-radius: var(--radius-sm);
  transition: background-color 0.2s ease, color 0.2s ease;
}

.index-list li a:hover {
  background-color: rgba(255, 255, 255, 0.08);
  color: var(--color-white);
}

.hero-main h1 {
  font-size: 32px;
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: 12px;
  line-height: 1.3;
}

.hero-description {
  font-size: 16px;
  color: rgba(255, 255, 255, 0.7);
  max-width: 560px;
  margin-bottom: 24px;
  line-height: 1.75;
}

.hero-figure {
  margin-bottom: 24px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.hero-figure img {
  width: 100%;
  height: 240px;
  object-fit: cover;
}

.hero-figure figcaption {
  padding: 10px 16px;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.5);
  background-color: rgba(255, 255, 255, 0.04);
}

.hero-cta {
  display: inline-block;
  padding: 12px 32px;
  background-color: var(--color-accent);
  color: var(--color-white);
  font-size: 16px;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: background-color 0.2s ease;
}

.hero-cta:hover {
  background-color: #c94a2e;
  color: var(--color-white);
}

/* --- 频道地图 --- */

.channel-map-section {
  padding: 56px 24px;
  max-width: var(--container-width);
  margin: 0 auto;
}

.channel-map-layout {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 40px;
  align-items: start;
}

.channel-index {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 20px;
  position: sticky;
  top: calc(var(--header-height) + 20px);
}

.topic-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.topic-list li a {
  display: block;
  padding: 10px 12px;
  font-size: 15px;
  color: var(--color-text);
  border-radius: var(--radius-sm);
  transition: background-color 0.2s ease, color 0.2s ease;
}

.topic-list li a:hover {
  background-color: rgba(47, 125, 112, 0.08);
  color: var(--color-teal);
}

.channel-cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

/* --- 观看路径步骤 --- */

.path-steps-section {
  background-color: var(--color-white);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  padding: 56px 24px;
}

.path-steps-section .section-heading {
  max-width: var(--container-width);
}

.path-steps {
  max-width: var(--container-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  counter-reset: step;
}

.step-item {
  background-color: var(--color-light);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  position: relative;
  transition: box-shadow 0.25s ease;
}

.step-item:hover {
  box-shadow: var(--shadow-hover);
}

.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background-color: var(--color-teal);
  color: var(--color-white);
  font-size: 16px;
  font-weight: 700;
  border-radius: 50%;
  margin-bottom: 16px;
}

.step-item h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 8px;
}

.step-item p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.65;
  margin-bottom: 14px;
}

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

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

/* --- 题材指南预览 --- */

.guide-preview-section {
  padding: 56px 24px;
  max-width: var(--container-width);
  margin: 0 auto;
}

.preview-cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.preview-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: box-shadow 0.25s ease;
}

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

.preview-card img {
  width: 100%;
  height: 180px;
  object-fit: cover;
}

.preview-card h3 {
  font-size: 20px;
  font-weight: 700;
  padding: 20px 24px 8px;
}

.preview-card .attr-table {
  margin: 0 24px 16px;
  width: calc(100% - 48px);
}

.preview-card > a {
  display: inline-block;
  margin: 0 24px 24px;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-teal);
}

.preview-card > a:hover {
  color: var(--color-accent);
}

/* --- 场景+百科双入口 --- */

.scene-lexicon-section {
  background-color: var(--color-white);
  border-top: 1px solid var(--color-border);
  padding: 56px 24px;
}

.scene-lexicon-section .section-heading {
  max-width: var(--container-width);
}

.dual-entry {
  max-width: var(--container-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
}

.entry-half {
  background-color: var(--color-light);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
}

.entry-half h3 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 8px;
}

.entry-half p {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-bottom: 18px;
  line-height: 1.65;
}

/* =========================================================
   5. pages —— 频道中心
   ========================================================= */

.filter-bar {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 36px;
  padding: 16px 20px;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.filter-label {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text-secondary);
  margin-right: 6px;
}

.filter-tag {
  padding: 6px 16px;
  font-size: 14px;
  color: var(--color-text);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  transition: border-color 0.2s ease, color 0.2s ease, background-color 0.2s ease;
}

.filter-tag:hover {
  border-color: var(--color-teal);
  color: var(--color-teal);
  background-color: rgba(47, 125, 112, 0.06);
}

.channel-map {
  margin-bottom: 40px;
}

.channel-map-head {
  margin-bottom: 24px;
}

.channel-map-head h2 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 6px;
}

.channel-map-head p {
  font-size: 15px;
  color: var(--color-text-secondary);
}

.channel-map-body {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 32px;
  align-items: start;
}

.channel-index {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  position: sticky;
  top: calc(var(--header-height) + 20px);
}

.index-item {
  display: block;
  padding: 10px 14px;
  font-size: 15px;
  color: var(--color-text);
  border-radius: var(--radius-sm);
  transition: background-color 0.2s ease, color 0.2s ease;
}

.index-item:hover {
  background-color: rgba(47, 125, 112, 0.08);
  color: var(--color-teal);
}

.channel-cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

.channel-card {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 0;
}

.channel-media img {
  width: 100%;
  height: 100%;
  min-height: 180px;
  object-fit: cover;
}

.channel-info {
  padding: 20px 24px;
  display: flex;
  flex-direction: column;
}

.channel-info h3 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 8px;
  padding: 0;
}

.channel-desc {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.65;
  margin-bottom: 12px;
}

.channel-attr {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 6px 16px;
  font-size: 14px;
  margin-bottom: 14px;
}

.channel-attr dt {
  font-weight: 600;
  color: var(--color-dark-soft);
}

.channel-attr dd {
  color: var(--color-text);
}

.card-link {
  display: inline-block;
  margin-top: auto;
  align-self: flex-start;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-teal);
  padding: 6px 0;
}

.card-link:hover {
  color: var(--color-accent);
}

.channel-note {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px 28px;
  margin-bottom: 40px;
}

.channel-note h2 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 12px;
}

.channel-note p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 8px;
}

/* =========================================================
   6. pages —— 题材指南
   ========================================================= */

.choose-method {
  margin-bottom: 48px;
}

.choose-method h2 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 20px;
}

.method-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.method-item {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 20px 24px;
}

.method-item h3 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 6px;
  color: var(--color-teal);
}

.method-item p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.65;
  margin: 0;
}

.guide-cards {
  margin-bottom: 48px;
}

.guide-cards h2 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 6px;
}

.section-intro {
  font-size: 15px;
  color: var(--color-text-secondary);
  margin-bottom: 28px;
}

.guide-card-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  margin-bottom: 32px;
}

.guide-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: box-shadow 0.25s ease;
}

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

.card-media img {
  width: 100%;
  height: 180px;
  object-fit: cover;
}

.card-content {
  padding: 20px 24px 24px;
}

.card-content h3 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 14px;
}

.card-content .attr-table {
  margin-bottom: 14px;
}

.card-note {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.65;
  margin-bottom: 14px;
}

.card-path {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  padding-top: 12px;
  border-top: 1px solid var(--color-border);
}

.path-label {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-text-secondary);
}

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

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

.compare-note {
  background-color: var(--color-dark);
  border-radius: var(--radius-lg);
  padding: 28px 32px;
  margin-bottom: 40px;
}

.compare-note h2 {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: 10px;
}

.compare-note p {
  font-size: 15px;
  color: rgba(255, 255, 255, 0.75);
  line-height: 1.7;
  margin-bottom: 8px;
}

.related-entry {
  margin-bottom: 40px;
}

.related-entry h2 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 16px;
}

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

.related-list li a {
  display: block;
  padding: 16px 20px;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: 15px;
  font-weight: 600;
  color: var(--color-teal);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.related-list li a:hover {
  border-color: var(--color-teal);
  box-shadow: var(--shadow-hover);
}

/* =========================================================
   7. pages —— 观看场景
   ========================================================= */

.scene-tabs {
  margin-bottom: 36px;
}

.scene-tabs h2 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 16px;
}

.scene-tab-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.scene-tab {
  padding: 8px 20px;
  font-size: 15px;
  color: var(--color-text);
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  transition: border-color 0.2s ease, color 0.2s ease, background-color 0.2s ease;
}

.scene-tab:hover {
  border-color: var(--color-teal);
  color: var(--color-teal);
  background-color: rgba(47, 125, 112, 0.06);
}

.scene-list {
  display: flex;
  flex-direction: column;
  gap: 32px;
  margin-bottom: 48px;
}

.scene-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: grid;
  grid-template-columns: 280px 1fr;
}

.scene-media img {
  width: 100%;
  height: 100%;
  min-height: 200px;
  object-fit: cover;
}

.scene-info {
  padding: 24px 28px;
}

.scene-info h2 {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 14px;
}

.scene-attr {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 16px;
  margin-bottom: 14px;
}

.attr-row {
  background-color: var(--color-light);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
}

.attr-row dt {
  font-size: 13px;
  color: var(--color-text-secondary);
  margin-bottom: 2px;
}

.attr-row dd {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-dark-soft);
}

.scene-info p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.65;
  margin-bottom: 14px;
}

.scene-entry {
  display: inline-block;
  padding: 8px 20px;
  background-color: var(--color-teal);
  color: var(--color-white);
  font-size: 14px;
  font-weight: 600;
  border-radius: var(--radius-sm);
  transition: background-color 0.2s ease;
}

.scene-entry:hover {
  background-color: #25665b;
  color: var(--color-white);
}

.rhythm-table {
  margin-bottom: 48px;
}

.rhythm-table h2 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 16px;
}

.table-wrap {
  overflow-x: auto;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.rhythm-table table {
  width: 100%;
  font-size: 14px;
  min-width: 640px;
}

.rhythm-table caption {
  padding: 14px 20px;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-dark-soft);
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

.rhythm-table thead th {
  background-color: var(--color-dark);
  color: var(--color-white);
  padding: 12px 16px;
  font-weight: 600;
  text-align: left;
  font-size: 14px;
}

.rhythm-table tbody td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--color-border);
  line-height: 1.6;
}

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

.rhythm-table tbody tr:hover {
  background-color: rgba(47, 125, 112, 0.04);
}

.table-note {
  font-size: 13px;
  color: var(--color-text-secondary);
  margin-top: 12px;
  padding: 0 4px;
}

.entrance {
  margin-bottom: 40px;
}

.entrance-inner {
  background-color: var(--color-dark);
  border-radius: var(--radius-lg);
  padding: 28px 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}

.entrance-inner h2 {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: 6px;
}

.entrance-inner p {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.7);
  margin: 0;
}

.entrance-link {
  display: inline-block;
  padding: 10px 24px;
  background-color: var(--color-accent);
  color: var(--color-white);
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: background-color 0.2s ease;
}

.entrance-link:hover {
  background-color: #c94a2e;
  color: var(--color-white);
}

/* =========================================================
   8. pages —— 内容百科
   ========================================================= */

.term-index {
  margin-bottom: 48px;
}

.term-index h2 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 20px;
}

.term-index-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.term-index-group {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 20px 24px;
}

.term-index-group h3 {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-teal);
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-border);
}

.term-index-group ul {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.term-index-group ul li a {
  display: block;
  padding: 8px 10px;
  font-size: 14px;
  color: var(--color-text);
  border-radius: var(--radius-sm);
  transition: background-color 0.2s ease, color 0.2s ease;
}

.term-index-group ul li a:hover {
  background-color: rgba(47, 125, 112, 0.08);
  color: var(--color-teal);
}

.term-cards {
  margin-bottom: 48px;
}

.term-cards-heading {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 6px;
}

.term-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.term-cards h2 {
  grid-column: 1 / -1;
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 6px;
}

.term-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 20px 24px;
  transition: box-shadow 0.25s ease;
}

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

.term-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
}

.term-card-header h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-dark-soft);
}

.term-tag {
  display: inline-block;
  padding: 3px 10px;
  font-size: 12px;
  font-weight: 600;
  color: var(--color-accent);
  background-color: rgba(224, 90, 60, 0.1);
  border-radius: 999px;
  white-space: nowrap;
}

.term-card > p {
  font-size: 14px;
  color: var(--color-text);
  line-height: 1.7;
  margin-bottom: 10px;
}

.term-example {
  font-size: 13px;
  color: var(--color-text-secondary);
  background-color: var(--color-light);
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  line-height: 1.6;
}

.term-example strong {
  color: var(--color-teal);
  font-weight: 600;
}

.play-prepare {
  margin-bottom: 48px;
}

.play-prepare h2 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 20px;
}

.prepare-content {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 32px;
  align-items: center;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
}

.prepare-image {
  width: 100%;
  height: 180px;
  object-fit: cover;
  border-radius: var(--radius-md);
}

.prepare-text p {
  font-size: 15px;
  color: var(--color-text);
  line-height: 1.7;
  margin-bottom: 12px;
}

.prepare-text ul {
  list-style: disc;
  padding-left: 20px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.prepare-text ul li {
  font-size: 14px;
  color: var(--color-text);
  line-height: 1.6;
}

.related {
  margin-bottom: 40px;
}

.related h2 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 16px;
}

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

.related-link {
  display: inline-block;
  padding: 10px 20px;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 600;
  color: var(--color-teal);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.related-link:hover {
  border-color: var(--color-teal);
  box-shadow: var(--shadow-hover);
}

/* =========================================================
   9. pages —— 帮助与反馈
   ========================================================= */

.faq-group {
  margin-bottom: 48px;
}

.faq-group h2 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 24px;
}

.faq-group-block {
  margin-bottom: 32px;
}

.faq-group-name {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-dark-soft);
  margin-bottom: 14px;
  padding-left: 12px;
  border-left: 3px solid var(--color-accent);
}

.faq-group-block .faq-item {
  margin-bottom: 10px;
}

.use-path {
  margin-bottom: 48px;
}

.use-path h2 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 20px;
}

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

.path-item {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 20px 24px;
}

.path-item h3 {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-teal);
  margin-bottom: 8px;
}

.path-item p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.65;
  margin: 0;
}

.path-item p a {
  font-weight: 600;
  color: var(--color-teal);
}

.path-item p a:hover {
  color: var(--color-accent);
}

.feedback {
  margin-bottom: 48px;
}

.feedback h2 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 12px;
}

.feedback p {
  font-size: 15px;
  color: var(--color-text);
  line-height: 1.7;
  max-width: 720px;
}

.feedback p a {
  font-weight: 600;
  color: var(--color-teal);
  text-decoration: underline;
  text-underline-offset: 3px;
}

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

.boundary {
  margin-bottom: 40px;
}

.boundary h2 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 16px;
}

.boundary-list {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px 28px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

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

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

.help-figure {
  margin-top: 32px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
}

.help-figure img {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

.help-figure figcaption {
  padding: 10px 16px;
  font-size: 13px;
  color: var(--color-text-secondary);
  background-color: var(--color-white);
}

/* =========================================================
   10. pages —— 404
   ========================================================= */

.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 60vh;
  padding: 48px 24px;
}

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

.error-code {
  font-size: 72px;
  font-weight: 700;
  color: var(--color-accent);
  line-height: 1;
  margin-bottom: 16px;
}

.error-panel h1 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 12px;
}

.error-desc {
  font-size: 15px;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 24px;
}

.error-btn {
  display: inline-block;
  padding: 12px 32px;
  background-color: var(--color-teal);
  color: var(--color-white);
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: background-color 0.2s ease;
}

.error-btn:hover {
  background-color: #25665b;
  color: var(--color-white);
}

.error-help {
  margin-top: 20px;
  font-size: 14px;
  color: var(--color-text-secondary);
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

.error-help a {
  color: var(--color-teal);
  font-weight: 500;
}

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

/* =========================================================
   11. responsive —— 响应式
   ========================================================= */

@media (max-width: 1024px) {
  .channel-map-body {
    grid-template-columns: 1fr;
  }

  .channel-index {
    position: static;
    flex-direction: row;
    flex-wrap: wrap;
    gap: 6px;
  }

  .index-item {
    padding: 6px 14px;
    font-size: 14px;
    border: 1px solid var(--color-border);
    border-radius: 999px;
  }

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

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

  .scene-card {
    grid-template-columns: 220px 1fr;
  }

  .scene-attr {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .prepare-content {
    grid-template-columns: 1fr;
  }

  .prepare-image {
    height: 160px;
  }
}

@media (max-width: 768px) {
  .header-inner {
    padding: 0 16px;
  }

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background-color: var(--color-dark);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    padding: 12px 16px;
    gap: 2px;
  }

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

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

  .site-nav.is-open {
    max-height: 420px;
  }

  .hero-layout {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .hero-index {
    order: -1;
  }

  .hero-main h1 {
    font-size: 26px;
  }

  .hero-figure img {
    height: 200px;
  }

  .channel-map-layout {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .channel-index {
    position: static;
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
  }

  .topic-list {
    flex-direction: row;
    flex-wrap: wrap;
  }

  .topic-list li a {
    padding: 6px 14px;
    font-size: 14px;
    border: 1px solid var(--color-border);
    border-radius: 999px;
  }

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

  .path-steps {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .preview-cards {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .dual-entry {
    grid-template-columns: 1fr;
    gap: 24px;
  }

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

  .inner-main {
    padding: 24px 16px 48px;
  }

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

  .method-list {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .guide-card-row {
    grid-template-columns: 1fr;
    gap: 24px;
  }

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

  .scene-tab-list {
    flex-wrap: nowrap;
    overflow-x: auto;
    padding-bottom: 8px;
    -webkit-overflow-scrolling: touch;
  }

  .scene-tab {
    flex-shrink: 0;
  }

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

  .scene-media img {
    height: 180px;
    min-height: 0;
  }

  .scene-info {
    padding: 20px;
  }

  .term-index-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .term-cards {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .term-cards h2 {
    grid-column: 1;
  }

  .path-list {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .help-notice {
    flex-direction: column;
    align-items: flex-start;
  }

  .entrance-inner {
    flex-direction: column;
    align-items: flex-start;
  }

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

  .channel-media img {
    height: 180px;
    min-height: 0;
  }

  .channel-attr {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .index-list {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 6px;
  }

  .index-list li a {
    padding: 6px 14px;
    font-size: 14px;
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 999px;
  }

  .index-title {
    width: 100%;
  }

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

  .error-code {
    font-size: 56px;
  }
}

@media (max-width: 480px) {
  .brand-tagline {
    display: none;
  }

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

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

  .hero-section {
    padding: 40px 0 48px;
  }

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

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

  .hero-figure img {
    height: 160px;
  }

  .section-heading h2 {
    font-size: 20px;
  }

  .channel-map-section,
  .path-steps-section,
  .guide-preview-section,
  .scene-lexicon-section {
    padding: 40px 16px;
  }

  .channel-cards {
    gap: 16px;
  }

  .channel-card h3 {
    font-size: 17px;
  }

  .step-item {
    padding: 20px 18px;
  }

  .preview-card h3 {
    font-size: 18px;
  }

  .entry-half {
    padding: 20px 16px;
  }

  .filter-bar {
    padding: 12px 16px;
  }

  .channel-info {
    padding: 16px;
  }

  .channel-info h3 {
    font-size: 18px;
  }

  .channel-note {
    padding: 18px 16px;
  }

  .card-content {
    padding: 16px;
  }

  .compare-note {
    padding: 20px;
  }

  .entrance-inner {
    padding: 20px;
  }

  .term-card {
    padding: 16px;
  }

  .term-index-group {
    padding: 16px;
  }

  .prepare-content {
    padding: 16px;
  }

  .boundary-list {
    padding: 18px 16px;
  }

  .error-panel {
    padding: 28px 20px;
  }

  .error-btn {
    padding: 10px 24px;
  }
}

/* =========================================================
   12. 动效增强（尊重 prefers-reduced-motion）
   ========================================================= */

@media (prefers-reduced-motion: no-preference) {
  .channel-card,
  .preview-card,
  .guide-card,
  .step-item,
  .term-card,
  .method-item,
  .path-item {
    transition: box-shadow 0.25s ease, transform 0.25s ease;
  }

  .channel-card:hover,
  .preview-card:hover,
  .guide-card:hover,
  .step-item:hover,
  .term-card:hover,
  .method-item:hover,
  .path-item:hover {
    transform: translateY(-2px);
  }
}

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