/* ============================================================
   base
   ============================================================ */
:root {
  --color-paper: #f7f5f1;
  --color-ink: #26313b;
  --color-deep: #1c262f;
  --color-teal: #1e8179;
  --color-coral: #e2634a;
  --color-amber: #e7b54a;
  --color-gray: #7c8898;
  --color-line: #d8d3c8;
  --color-white: #ffffff;
  --font-main: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --container-width: 1200px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --header-height: 64px;
  --space-section: 72px;
}

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

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

body {
  font-family: var(--font-main);
  font-size: 16px;
  line-height: 1.75;
  color: var(--color-ink);
  background-color: var(--color-paper);
}

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

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

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

ul,
ol {
  list-style: none;
}

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

h1 {
  font-size: 32px;
}

h2 {
  font-size: 24px;
}

h3 {
  font-size: 18px;
}

h4 {
  font-size: 16px;
}

p {
  margin-bottom: 12px;
}

figure {
  margin: 0;
}

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

details summary {
  cursor: pointer;
  list-style: none;
}

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

/* ============================================================
   layout
   ============================================================ */
.site-header {
  background-color: var(--color-white);
  border-bottom: 1px solid var(--color-line);
}

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

.brand-name {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-deep);
  letter-spacing: 0.02em;
}

.brand:hover .brand-name {
  color: var(--color-teal);
}

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

.home-main {
  padding-top: 0;
}

.inner-main {
  padding-top: 24px;
  padding-bottom: 72px;
}

/* 面包屑 */
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 14px;
  color: var(--color-gray);
  padding: 12px 0 20px;
}

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

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

.breadcrumb-sep {
  color: var(--color-line);
}

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

/* 页面标题区 */
.page-header {
  border-bottom: 1px solid var(--color-line);
  padding-bottom: 28px;
  margin-bottom: 48px;
}

.page-title {
  font-size: 30px;
  font-weight: 700;
  margin-bottom: 12px;
  position: relative;
  padding-bottom: 14px;
}

.page-title::after {
  content: "";
  display: block;
  width: 56px;
  height: 4px;
  background-color: var(--color-teal);
  margin-top: 14px;
}

.page-description {
  font-size: 17px;
  color: var(--color-gray);
  line-height: 1.8;
  max-width: 780px;
  margin-bottom: 0;
}

/* 页脚 */
.site-footer {
  border-top: 1px solid var(--color-line);
  background-color: var(--color-white);
  margin-top: 48px;
}

.footer-columns {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px 24px 36px;
  display: grid;
  grid-template-columns: 1.2fr 1fr 0.8fr;
  gap: 48px;
}

.footer-brand {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-deep);
  margin-bottom: 12px;
}

.footer-col p {
  font-size: 14px;
  color: var(--color-gray);
  line-height: 1.8;
  margin-bottom: 8px;
}

.footer-heading {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-deep);
  margin-bottom: 14px;
}

.footer-col a {
  font-size: 14px;
  color: var(--color-gray);
  display: inline-block;
  padding: 3px 0;
}

.footer-col a:hover {
  color: var(--color-teal);
}

.copyright {
  border-top: 1px solid var(--color-line);
  padding: 18px 24px;
  text-align: center;
  font-size: 13px;
  color: var(--color-gray);
  margin: 0;
}

/* ============================================================
   components
   ============================================================ */

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

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

.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-ink);
  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: var(--color-paper);
  color: var(--color-teal);
}

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

/* 区块标题 */
.section-title {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-deep);
  margin-bottom: 12px;
  position: relative;
  padding-left: 14px;
}

.section-title::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  bottom: 4px;
  width: 4px;
  background-color: var(--color-teal);
}

.section-intro {
  font-size: 15px;
  color: var(--color-gray);
  margin-bottom: 28px;
  max-width: 720px;
}

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

.qa-item summary {
  padding: 16px 20px;
  font-size: 16px;
  font-weight: 600;
  color: var(--color-deep);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  transition: background-color 0.2s ease;
}

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

.qa-item summary::after {
  content: "+";
  font-size: 20px;
  font-weight: 400;
  color: var(--color-teal);
  flex-shrink: 0;
  transition: transform 0.2s ease;
}

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

.qa-item .qa-answer {
  padding: 0 20px 20px;
  border-top: 1px solid var(--color-line);
  background-color: var(--color-white);
}

.qa-item .qa-answer p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-ink);
  margin-bottom: 10px;
}

.qa-item .qa-answer p:first-child {
  padding-top: 16px;
}

.qa-item .qa-answer a {
  font-size: 14px;
  font-weight: 600;
}

/* ============================================================
   pages —— 首页
   ============================================================ */

/* 首屏 */
.hero-panel {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
  padding: 56px 0 48px;
}

.hero-copy h1 {
  font-size: 34px;
  line-height: 1.3;
  margin-bottom: 16px;
}

.hero-lead {
  font-size: 19px;
  font-weight: 500;
  color: var(--color-teal);
  margin-bottom: 16px;
  line-height: 1.6;
}

.hero-description {
  font-size: 16px;
  color: var(--color-gray);
  line-height: 1.85;
  margin-bottom: 28px;
}

.hero-entry {
  display: inline-block;
  background-color: var(--color-teal);
  color: var(--color-white);
  font-size: 15px;
  font-weight: 600;
  padding: 12px 28px;
  border-radius: var(--radius-sm);
  transition: background-color 0.2s ease, transform 0.2s ease;
}

.hero-entry:hover {
  background-color: var(--color-deep);
  color: var(--color-white);
  transform: translateY(-2px);
}

.hero-media {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.hero-figure {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 12px;
}

.hero-figure img {
  width: 100%;
  height: 280px;
  object-fit: cover;
  border-radius: var(--radius-sm);
}

.hero-figure figcaption {
  padding: 12px 4px 4px;
}

.hero-media-note {
  font-size: 13px;
  color: var(--color-gray);
  background-color: var(--color-white);
  border-left: 3px solid var(--color-amber);
  padding: 10px 14px;
  margin-bottom: 0;
}

/* 频道带 */
.channel-band {
  padding: 56px 0;
  border-top: 1px solid var(--color-line);
}

.channel-tag-row {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 0;
  margin: 24px 0 20px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.channel-tag {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px 12px;
  font-size: 15px;
  font-weight: 600;
  color: var(--color-white);
  text-align: center;
  min-height: 56px;
  transition: transform 0.2s ease, filter 0.2s ease;
}

.channel-tag:hover {
  transform: translateY(-2px);
  color: var(--color-white);
  filter: brightness(0.92);
}

.tag-teal {
  background-color: #1e8179;
}

.tag-amber {
  background-color: #c99a2e;
}

.tag-coral {
  background-color: #c4563f;
}

.tag-slate {
  background-color: #5a6a7a;
}

.tag-green {
  background-color: #4a7c59;
}

.tag-line {
  background-color: #8a7a4a;
}

.channel-note {
  font-size: 14px;
  color: var(--color-gray);
  margin-bottom: 0;
}

/* 首页额外图片区 */
.home-media-extra {
  padding: 0 0 56px;
}

.extra-figure {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 24px;
  align-items: center;
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 20px;
}

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

.extra-figure figcaption {
  font-size: 15px;
  color: var(--color-ink);
  line-height: 1.85;
  padding: 8px 0;
}

/* 最新整理志 */
.latest-list {
  padding: 0 0 56px;
}

.timeline-list {
  position: relative;
  padding-left: 24px;
  margin-top: 24px;
}

.timeline-list::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 4px;
  bottom: 4px;
  width: 2px;
  background-color: var(--color-line);
}

.timeline-item {
  position: relative;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 24px;
  align-items: baseline;
  padding: 16px 0;
  border-bottom: 1px solid var(--color-line);
}

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

.timeline-item:last-child {
  padding-bottom: 0;
}

.timeline-dot {
  position: absolute;
  left: -24px;
  top: 24px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background-color: var(--color-teal);
  border: 2px solid var(--color-paper);
}

.timeline-item:nth-child(even) .timeline-dot {
  background-color: var(--color-amber);
}

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

.timeline-content p {
  font-size: 14px;
  color: var(--color-gray);
  margin-bottom: 6px;
}

.timeline-content a {
  font-size: 14px;
  font-weight: 600;
}

/* 首页折叠问答 */
.qa-fold-section {
  padding: 56px 0;
  border-top: 1px solid var(--color-line);
}

.qa-layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 48px;
  margin-top: 24px;
}

.qa-side .section-title {
  margin-bottom: 20px;
}

.qa-topic-list li {
  margin-bottom: 2px;
}

.qa-topic-list li a {
  display: block;
  padding: 10px 12px;
  font-size: 15px;
  color: var(--color-ink);
  border-left: 3px solid transparent;
  transition: border-color 0.2s ease, background-color 0.2s ease, color 0.2s ease;
}

.qa-topic-list li a:hover {
  border-left-color: var(--color-teal);
  background-color: var(--color-white);
  color: var(--color-teal);
}

.qa-side-note {
  font-size: 13px;
  color: var(--color-gray);
  margin-top: 16px;
  padding-left: 12px;
}

.qa-accordion {
  display: flex;
  flex-direction: column;
  gap: 0;
}

/* 行动带 */
.action-band {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  padding: 0 0 64px;
}

.action-item {
  border-radius: var(--radius-md);
  padding: 36px 40px;
  min-height: 200px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  transition: transform 0.2s ease;
}

.action-item:hover {
  transform: translateY(-4px);
}

.action-dark {
  background-color: var(--color-deep);
}

.action-dark h2 {
  color: var(--color-white);
  margin-bottom: 12px;
}

.action-dark p {
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: 20px;
}

.action-dark a {
  color: var(--color-amber);
  font-weight: 600;
  display: inline-block;
}

.action-teal {
  background-color: var(--color-teal);
}

.action-teal h2 {
  color: var(--color-white);
  margin-bottom: 12px;
}

.action-teal p {
  color: rgba(255, 255, 255, 0.85);
  margin-bottom: 20px;
}

.action-teal a {
  color: var(--color-white);
  font-weight: 600;
  display: inline-block;
  text-decoration: underline;
  text-underline-offset: 4px;
}

/* ============================================================
   pages —— 基础入门
   ============================================================ */

.channel-concept-block {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 48px;
  align-items: center;
  margin-bottom: 56px;
}

.concept-media {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 12px;
}

.concept-media img {
  width: 100%;
  height: 260px;
  object-fit: cover;
  border-radius: var(--radius-sm);
}

.concept-media figcaption {
  padding: 10px 4px 4px;
}

.concept-text h2 {
  margin-bottom: 16px;
}

.concept-text p {
  font-size: 15px;
  line-height: 1.9;
  margin-bottom: 14px;
  color: var(--color-ink);
}

.step-strip {
  margin-bottom: 56px;
}

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

.step-item {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 32px 28px;
  position: relative;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.step-item:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(28, 38, 47, 0.06);
}

.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  background-color: var(--color-teal);
  color: var(--color-white);
  font-size: 18px;
  font-weight: 700;
  border-radius: var(--radius-sm);
  margin-bottom: 20px;
}

.step-item:nth-child(2) .step-number {
  background-color: var(--color-amber);
}

.step-item:nth-child(3) .step-number {
  background-color: var(--color-coral);
}

.step-item h3 {
  font-size: 18px;
  margin-bottom: 10px;
}

.step-item p {
  font-size: 14px;
  color: var(--color-gray);
  line-height: 1.8;
  margin-bottom: 16px;
}

.step-item a {
  font-size: 14px;
  font-weight: 600;
}

/* 看前准备清单 */
.preparation-list {
  margin-bottom: 56px;
}

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

.check-item {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 24px 24px;
  border-left: 4px solid var(--color-teal);
}

.check-item:nth-child(2) {
  border-left-color: var(--color-amber);
}

.check-item:nth-child(3) {
  border-left-color: var(--color-coral);
}

.check-item:nth-child(4) {
  border-left-color: var(--color-gray);
}

.check-item:nth-child(5) {
  border-left-color: var(--color-teal);
}

.check-item h3 {
  font-size: 16px;
  margin-bottom: 8px;
}

.check-item p {
  font-size: 14px;
  color: var(--color-gray);
  line-height: 1.8;
  margin-bottom: 0;
}

/* 下一步入口 */
.next-entry-card {
  margin-bottom: 16px;
}

.next-card-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-top: 24px;
}

.next-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 32px 28px;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.next-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(28, 38, 47, 0.06);
}

.next-card h3 {
  font-size: 18px;
  margin-bottom: 10px;
}

.next-card p {
  font-size: 14px;
  color: var(--color-gray);
  line-height: 1.8;
  margin-bottom: 16px;
}

.next-card a {
  font-size: 14px;
  font-weight: 600;
}

/* ============================================================
   pages —— 主题档案
   ============================================================ */

.genre-tags {
  margin-bottom: 48px;
}

.genre-tags .section-title {
  margin-bottom: 20px;
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 16px;
}

.tag-item {
  display: inline-block;
  padding: 8px 20px;
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  font-size: 14px;
  color: var(--color-ink);
}

.tag-item:nth-child(1) {
  border-color: var(--color-teal);
  color: var(--color-teal);
}

.tag-item:nth-child(2) {
  border-color: var(--color-amber);
  color: #a87a1a;
}

.tag-item:nth-child(3) {
  border-color: var(--color-coral);
  color: var(--color-coral);
}

.tag-item:nth-child(4) {
  border-color: var(--color-gray);
  color: var(--color-gray);
}

.genre-tags p {
  font-size: 14px;
  color: var(--color-gray);
  margin-bottom: 0;
}

/* 题材专题块 */
.special-topic-blocks {
  margin-bottom: 56px;
}

.topic-block {
  display: grid;
  grid-template-columns: 1fr 0.9fr;
  gap: 40px;
  align-items: center;
  padding: 40px 0;
  border-bottom: 1px solid var(--color-line);
}

.topic-block:first-of-type {
  padding-top: 8px;
}

.topic-block:last-of-type {
  border-bottom: none;
}

.topic-block:nth-child(even) {
  grid-template-columns: 0.9fr 1fr;
}

.topic-block:nth-child(even) .topic-copy {
  order: 2;
}

.topic-block:nth-child(even) .topic-figure {
  order: 1;
}

.topic-copy h3 {
  font-size: 20px;
  margin-bottom: 12px;
  position: relative;
  padding-bottom: 10px;
}

.topic-copy h3::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 36px;
  height: 3px;
  background-color: var(--color-teal);
}

.topic-copy p {
  font-size: 15px;
  line-height: 1.85;
  color: var(--color-ink);
  margin-bottom: 12px;
}

.topic-figure {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 10px;
}

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

.topic-figure figcaption {
  padding: 10px 4px 2px;
}

/* 片单构成说明 */
.playlist-structure {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 40px;
  margin-bottom: 48px;
}

.playlist-structure h2 {
  margin-bottom: 16px;
}

.playlist-structure p {
  font-size: 15px;
  line-height: 1.9;
  color: var(--color-ink);
  margin-bottom: 12px;
}

.playlist-structure p:last-child {
  margin-bottom: 0;
}

/* 相关链接 */
.related-links {
  margin-bottom: 48px;
}

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

.link-list p {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 20px;
  margin-bottom: 0;
  font-size: 14px;
  color: var(--color-gray);
  line-height: 1.8;
}

.link-list a {
  font-weight: 600;
  font-size: 15px;
  display: block;
  margin-bottom: 8px;
}

/* 底部关联导航（zhuti 与 wenda 共用） */
.related-links {
  margin-top: 16px;
}

.related-links-label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-deep);
  margin-bottom: 12px;
}

.related-links-item {
  display: inline-block;
  font-size: 14px;
  color: var(--color-teal);
  margin-right: 20px;
  padding: 6px 0;
}

.related-links-item:hover {
  color: var(--color-deep);
}

/* ============================================================
   pages —— 进阶阅读
   ============================================================ */

.structural-index-grid {
  margin-bottom: 56px;
}

.structural-index-grid .section-desc {
  font-size: 15px;
  color: var(--color-gray);
  margin-bottom: 28px;
  max-width: 720px;
}

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

.index-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 32px 28px;
  border-top: 4px solid var(--color-teal);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.index-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(28, 38, 47, 0.06);
}

.index-card:nth-child(2) {
  border-top-color: var(--color-amber);
}

.index-card:nth-child(3) {
  border-top-color: var(--color-coral);
}

.index-card:nth-child(4) {
  border-top-color: var(--color-gray);
}

.index-card h3 {
  font-size: 18px;
  margin-bottom: 10px;
}

.index-card p {
  font-size: 14px;
  color: var(--color-ink);
  line-height: 1.85;
  margin-bottom: 12px;
}

.index-card .card-note {
  font-size: 13px;
  color: var(--color-gray);
  border-top: 1px solid var(--color-line);
  padding-top: 12px;
  margin-bottom: 0;
}

/* 片单拆解栏 */
.playlist-case {
  margin-bottom: 56px;
}

.case-content {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 40px;
  align-items: center;
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 24px;
}

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

.case-media figcaption {
  padding: 10px 4px 2px;
}

.case-text p {
  font-size: 15px;
  line-height: 1.9;
  color: var(--color-ink);
  margin-bottom: 12px;
}

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

/* 文章块 */
.essay-block {
  margin-bottom: 56px;
}

.essay-content {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 40px;
  margin-top: 24px;
}

.essay-content p {
  font-size: 15px;
  line-height: 2;
  color: var(--color-ink);
  margin-bottom: 16px;
}

.essay-content p:last-child {
  margin-bottom: 0;
}

/* 前后关联 */
.prev-next-links {
  border-top: 1px solid var(--color-line);
  padding-top: 24px;
}

.link-pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.link-pair a {
  display: block;
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 18px 24px;
  font-size: 15px;
  font-weight: 600;
  color: var(--color-deep);
  transition: border-color 0.2s ease, color 0.2s ease;
}

.link-pair a:hover {
  border-color: var(--color-teal);
  color: var(--color-teal);
}

.link-note {
  margin-top: 16px;
  font-size: 14px;
  color: var(--color-gray);
}

.link-note a {
  font-size: 14px;
  margin-right: 16px;
}

/* ============================================================
   pages —— 短剧名词
   ============================================================ */

.term-intro-block {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 40px;
  align-items: center;
  margin-bottom: 48px;
}

.term-intro-media {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 10px;
}

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

.term-intro-copy p {
  font-size: 15px;
  line-height: 1.9;
  color: var(--color-ink);
  margin-bottom: 12px;
}

.term-intro-copy .term-note {
  font-size: 14px;
  color: var(--color-gray);
  background-color: var(--color-white);
  border-left: 3px solid var(--color-amber);
  padding: 12px 16px;
}

.term-intro-copy .term-note a {
  font-weight: 600;
}

/* 术语双栏布局 */
.term-layout {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 48px;
  align-items: start;
}

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

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

.term-category-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-deep);
  margin-bottom: 8px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--color-teal);
  display: inline-block;
}

.term-category-desc {
  font-size: 14px;
  color: var(--color-gray);
  margin-bottom: 20px;
}

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

.term-item {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 4px 20px;
  padding: 16px 20px;
  border-bottom: 1px solid var(--color-line);
  transition: background-color 0.2s ease;
}

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

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

.term-name {
  font-weight: 700;
  font-size: 15px;
  color: var(--color-deep);
  grid-row: span 2;
  align-self: center;
}

.term-meaning {
  font-size: 14px;
  color: var(--color-ink);
  line-height: 1.7;
}

.term-usage {
  font-size: 13px;
  color: var(--color-gray);
  line-height: 1.6;
}

/* 上下文说明 */
.term-context-block {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 32px;
  margin-bottom: 48px;
}

.term-context-block h2 {
  margin-bottom: 16px;
}

.term-context-block p {
  font-size: 15px;
  line-height: 1.9;
  color: var(--color-ink);
  margin-bottom: 12px;
}

.term-context-block p:last-child {
  margin-bottom: 0;
}

/* 侧栏 */
.term-sidebar {
  position: sticky;
  top: 24px;
}

.sidebar-box {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 24px;
  margin-bottom: 20px;
}

.sidebar-heading {
  font-size: 15px;
  font-weight: 700;
  color: var(--color-deep);
  margin-bottom: 14px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-line);
}

.sidebar-list li {
  margin-bottom: 2px;
}

.sidebar-list li a {
  display: block;
  padding: 6px 0;
  font-size: 14px;
  color: var(--color-gray);
  transition: color 0.2s ease, padding-left 0.2s ease;
}

.sidebar-list li a:hover {
  color: var(--color-teal);
  padding-left: 6px;
}

.sidebar-note {
  font-size: 13px;
  color: var(--color-gray);
  line-height: 1.7;
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--color-line);
}

/* 词表后续链接 */
.term-further-links {
  border-top: 1px solid var(--color-line);
  padding-top: 32px;
}

.term-further-links p {
  font-size: 14px;
  color: var(--color-gray);
  margin-bottom: 16px;
}

.further-list {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.further-list li a {
  display: inline-block;
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  padding: 8px 20px;
  font-size: 14px;
  color: var(--color-ink);
  transition: border-color 0.2s ease, color 0.2s ease;
}

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

/* ============================================================
   pages —— 问答中心
   ============================================================ */

.qa-entry-figure {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 10px;
  margin-bottom: 48px;
}

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

.qa-entry-figure figcaption {
  padding: 10px 4px 2px;
}

/* 三视图 */
.question-views {
  margin-bottom: 56px;
}

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

.view-column {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 28px;
}

.view-column h3 {
  font-size: 18px;
  margin-bottom: 20px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--color-teal);
  display: inline-block;
}

.view-column:nth-child(2) h3 {
  border-bottom-color: var(--color-amber);
}

.question-list li {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  padding: 12px 0;
  border-bottom: 1px solid var(--color-line);
}

.question-list li:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.question-label {
  flex-shrink: 0;
  display: inline-block;
  background-color: var(--color-paper);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  font-size: 12px;
  color: var(--color-gray);
  padding: 2px 10px;
  margin-top: 4px;
}

.question-text {
  font-size: 14px;
  color: var(--color-ink);
  line-height: 1.7;
  margin-bottom: 0;
}

/* 高质量回答 */
.high-quality-answers {
  margin-bottom: 56px;
}

.qa-list {
  margin-top: 20px;
}

/* 回答入口组 */
.answer-entry-block {
  margin-bottom: 48px;
}

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

.entry-item {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 28px 24px;
  transition: transform 0.2s ease;
}

.entry-item:hover {
  transform: translateY(-4px);
}

.entry-item h3 {
  font-size: 16px;
  margin-bottom: 10px;
}

.entry-item p {
  font-size: 14px;
  color: var(--color-gray);
  line-height: 1.8;
  margin-bottom: 16px;
}

.entry-item a {
  font-size: 14px;
  font-weight: 600;
}

/* 边界引导窄带 */
.boundary-link-strip {
  background-color: var(--color-deep);
  border-radius: var(--radius-md);
  padding: 24px 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
  margin-bottom: 24px;
}

.boundary-link-strip p {
  color: rgba(255, 255, 255, 0.85);
  font-size: 15px;
  margin-bottom: 0;
}

.boundary-link-strip a {
  color: var(--color-amber);
  font-weight: 600;
  white-space: nowrap;
}

/* ============================================================
   pages —— 收录边界
   ============================================================ */

.scope-two-column {
  margin-bottom: 56px;
}

.content-media-inline {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 10px;
  margin-bottom: 32px;
}

.content-media-inline img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  border-radius: var(--radius-sm);
}

.content-media-inline figcaption {
  padding: 10px 4px 2px;
}

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

.scope-col {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 32px 28px;
}

.scope-col h3 {
  font-size: 18px;
  margin-bottom: 20px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--color-teal);
}

.scope-col-deny h3 {
  border-bottom-color: var(--color-coral);
}

.scope-list li {
  padding: 14px 0;
  border-bottom: 1px solid var(--color-line);
}

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

.scope-list h4 {
  font-size: 15px;
  margin-bottom: 6px;
}

.scope-list p {
  font-size: 14px;
  color: var(--color-gray);
  line-height: 1.8;
  margin-bottom: 0;
}

/* 合规说明 */
.legal-paragraph {
  margin-bottom: 56px;
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 40px;
}

.legal-paragraph h2 {
  margin-bottom: 20px;
}

.legal-paragraph p {
  font-size: 15px;
  line-height: 2;
  color: var(--color-ink);
  margin-bottom: 14px;
}

.legal-paragraph p:last-child {
  margin-bottom: 0;
}

/* 反馈路径 */
.feedback-path {
  margin-bottom: 48px;
}

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

.path-item {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 28px 24px;
}

.path-item h3 {
  font-size: 16px;
  margin-bottom: 10px;
}

.path-item p {
  font-size: 14px;
  color: var(--color-gray);
  line-height: 1.8;
  margin-bottom: 16px;
}

.path-item a {
  font-size: 14px;
  font-weight: 600;
}

/* 相关页面 */
.related-pages {
  border-top: 1px solid var(--color-line);
  padding-top: 24px;
}

.related-pages p {
  font-size: 15px;
  color: var(--color-gray);
  margin-bottom: 12px;
}

.related-pages ul {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

.related-pages ul li a {
  font-size: 15px;
  font-weight: 600;
  display: inline-block;
  padding: 6px 0;
}

/* ============================================================
   pages —— 404
   ============================================================ */

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

.error-panel {
  text-align: center;
  max-width: 560px;
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 56px 48px;
}

.error-code {
  font-size: 72px;
  font-weight: 700;
  color: var(--color-line);
  line-height: 1;
  margin-bottom: 12px;
}

.error-panel h1 {
  font-size: 24px;
  margin-bottom: 16px;
}

.error-desc {
  font-size: 15px;
  color: var(--color-gray);
  line-height: 1.8;
  margin-bottom: 12px;
}

.error-home-link {
  display: inline-block;
  background-color: var(--color-teal);
  color: var(--color-white);
  font-weight: 600;
  padding: 12px 32px;
  border-radius: var(--radius-sm);
  margin-top: 12px;
  transition: background-color 0.2s ease;
}

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

/* ============================================================
   responsive
   ============================================================ */

@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;
  }
}

@media (max-width: 1024px) {
  .footer-columns {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }

  .footer-col:first-child {
    grid-column: span 2;
  }

  .channel-tag-row {
    grid-template-columns: repeat(3, 1fr);
  }

  .channel-tag {
    border-bottom: 1px solid rgba(255, 255, 255, 0.15);
  }

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

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

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

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

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

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

  .sidebar-box {
    margin-bottom: 0;
  }

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

  .qa-side {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    align-items: start;
  }

  .qa-side .section-title {
    grid-column: span 2;
  }

  .qa-side-note {
    grid-column: span 2;
  }
}

@media (max-width: 768px) {
  :root {
    --space-section: 48px;
  }

  .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-white);
    border-bottom: 1px solid var(--color-line);
    z-index: 100;
  }

  .site-nav .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px 16px 16px;
  }

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

  .site-nav .nav-list li a {
    padding: 14px 8px;
    border-bottom: 1px solid var(--color-paper);
    font-size: 16px;
  }

  .site-nav .nav-list li:last-child a {
    border-bottom: none;
  }

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

  .site-main {
    padding: 0 16px;
  }

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

  .page-header {
    margin-bottom: 32px;
  }

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

  .page-description {
    font-size: 16px;
  }

  .footer-columns {
    grid-template-columns: 1fr;
    gap: 24px;
    padding: 32px 16px 24px;
  }

  .footer-col:first-child {
    grid-column: span 1;
  }

  /* 首页 */
  .hero-panel {
    grid-template-columns: 1fr;
    gap: 24px;
    padding: 32px 0;
  }

  .hero-copy h1 {
    font-size: 28px;
  }

  .hero-figure img {
    height: 220px;
  }

  .channel-band {
    padding: 40px 0;
  }

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

  .extra-figure {
    grid-template-columns: 1fr;
  }

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

  .timeline-item {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .action-band {
    grid-template-columns: 1fr;
    gap: 16px;
    padding-bottom: 48px;
  }

  .action-item {
    padding: 28px 24px;
    min-height: auto;
  }

  /* 基础入门 */
  .channel-concept-block {
    grid-template-columns: 1fr;
    gap: 24px;
    margin-bottom: 40px;
  }

  .step-row {
    grid-template-columns: 1fr;
    gap: 16px;
  }

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

  .next-card-row {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  /* 主题档案 */
  .topic-block {
    grid-template-columns: 1fr;
    gap: 20px;
    padding: 28px 0;
  }

  .topic-block:nth-child(even) {
    grid-template-columns: 1fr;
  }

  .topic-block:nth-child(even) .topic-copy {
    order: 1;
  }

  .topic-block:nth-child(even) .topic-figure {
    order: 2;
  }

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

  .playlist-structure {
    padding: 28px 20px;
  }

  /* 进阶阅读 */
  .index-grid-wrap {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .case-content {
    grid-template-columns: 1fr;
    gap: 20px;
    padding: 16px;
  }

  .case-media img {
    height: 200px;
  }

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

  .link-pair {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  /* 名词页 */
  .term-intro-block {
    grid-template-columns: 1fr;
    gap: 20px;
    margin-bottom: 32px;
  }

  .term-figure img {
    height: 180px;
  }

  .term-item {
    grid-template-columns: 1fr;
    gap: 2px;
  }

  .term-name {
    grid-row: span 1;
    font-size: 16px;
    margin-bottom: 4px;
  }

  .term-usage {
    margin-top: 4px;
  }

  .term-context-block {
    padding: 24px 20px;
  }

  .term-sidebar {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .sidebar-box {
    margin-bottom: 0;
  }

  /* 问答页 */
  .qa-entry-figure img {
    height: 180px;
  }

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

  .qa-side {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .qa-side .section-title {
    grid-column: span 1;
  }

  .qa-side-note {
    grid-column: span 1;
  }

  .qa-topic-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
  }

  .qa-topic-list li a {
    border-left: none;
    border-bottom: 2px solid transparent;
    padding: 6px 4px;
    margin-right: 16px;
  }

  .qa-topic-list li a:hover {
    border-left-color: transparent;
    border-bottom-color: var(--color-teal);
  }

  /* 边界页 */
  .scope-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .scope-col {
    padding: 24px 20px;
  }

  .legal-paragraph {
    padding: 24px 20px;
  }

  .content-media-inline img {
    height: 180px;
  }

  .boundary-link-strip {
    padding: 20px;
    flex-direction: column;
    align-items: flex-start;
  }

  /* 404 */
  .error-panel {
    padding: 40px 24px;
  }

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

@media (max-width: 480px) {
  .channel-tag-row {
    grid-template-columns: repeat(2, 1fr);
  }

  .channel-tag {
    padding: 14px 8px;
    font-size: 14px;
    min-height: 48px;
  }

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

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

  .hero-lead {
    font-size: 17px;
  }

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

  .hero-figure img {
    height: 180px;
  }

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

  .qa-item summary {
    font-size: 15px;
    padding: 14px 16px;
  }

  .qa-item .qa-answer {
    padding: 0 16px 16px;
  }

  .footer-columns {
    gap: 20px;
  }

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

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

  .topic-copy h3 {
    font-size: 18px;
  }

  .timeline-content h3 {
    font-size: 15px;
  }

  .timeline-content p {
    font-size: 13px;
  }

  .action-item {
    padding: 24px 20px;
  }

  .action-item h2 {
    font-size: 20px;
  }

  .step-item {
    padding: 24px 20px;
  }

  .check-item {
    padding: 20px 16px;
  }

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

  .playlist-structure h2 {
    font-size: 20px;
  }

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

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

  .term-context-block h2 {
    font-size: 20px;
  }

  .view-column {
    padding: 20px 16px;
  }

  .view-column h3 {
    font-size: 17px;
  }

  .entry-item {
    padding: 24px 20px;
  }

  .path-item {
    padding: 24px 20px;
  }

  .scope-list h4 {
    font-size: 14px;
  }

  .legal-paragraph h2 {
    font-size: 20px;
  }

  .related-pages ul {
    flex-direction: column;
    gap: 4px;
  }

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

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