/* ============================================================
   Base — 变量、重置、全局基础
   ============================================================ */
:root {
  --color-bg: #f5f0e8;
  --color-primary: #8b5e3c;
  --color-dark: #3e2723;
  --color-accent: #c8a882;
  --color-white: #ffffff;
  --color-text: #4a3f35;
  --color-text-light: #7a6a5c;
  --color-border: #d9cbb8;
  --font-serif: Georgia, "Times New Roman", serif;
  --font-sans: Arial, Helvetica, sans-serif;
  --container-width: 1200px;
  --content-width: 860px;
  --radius: 8px;
  --radius-sm: 4px;
  --shadow-card: 0 2px 8px rgba(62, 39, 35, 0.08);
  --shadow-card-hover: 0 6px 20px rgba(62, 39, 35, 0.14);
  --transition: 0.25s ease;
  --header-height: 72px;
}

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

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

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

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

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

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

ul,
ol {
  list-style-position: inside;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-serif);
  color: var(--color-dark);
  line-height: 1.3;
}

h1 {
  font-size: 2rem;
  font-weight: 700;
}

h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
}

h3 {
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

p {
  margin-bottom: 1rem;
}

figure {
  margin: 0;
}

figcaption {
  font-size: 0.875rem;
  color: var(--color-text-light);
  text-align: center;
  padding: 0.5rem 0 0;
}

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

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

/* ============================================================
   Layout — 全站统一骨架
   ============================================================ */

/* 页头 */
.site-header {
  background-color: var(--color-dark);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.18);
}

.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 {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-white);
  letter-spacing: 0.02em;
  white-space: nowrap;
}

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

/* 导航 */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.35);
  border-radius: var(--radius-sm);
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--color-white);
  border-radius: 2px;
  transition: background-color var(--transition);
}

.nav-toggle:hover span {
  background-color: var(--color-accent);
}

.site-nav .nav-list {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
}

.site-nav .nav-list li a {
  display: block;
  padding: 8px 16px;
  font-size: 0.9375rem;
  color: rgba(255, 255, 255, 0.85);
  border-radius: var(--radius-sm);
  transition: background-color var(--transition), color var(--transition);
}

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

.site-nav .nav-list li a.is-current {
  color: var(--color-white);
  background-color: var(--color-primary);
  font-weight: 700;
}

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

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

/* 面包屑 */
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 0.875rem;
  color: var(--color-text-light);
  margin-bottom: 24px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-border);
}

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

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

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

.breadcrumb-current {
  color: var(--color-text);
  font-weight: 600;
}

/* 页面标题区 */
.page-header {
  margin-bottom: 40px;
  padding-bottom: 24px;
  border-bottom: 2px solid var(--color-accent);
}

.page-title {
  font-size: 2.125rem;
  margin-bottom: 12px;
}

.page-description {
  font-size: 1.0625rem;
  color: var(--color-text-light);
  max-width: var(--content-width);
}

.page-description a {
  font-weight: 600;
  text-decoration: underline;
}

/* 页脚 */
.site-footer {
  background-color: var(--color-dark);
  color: rgba(255, 255, 255, 0.8);
  padding: 48px 0 24px;
}

.footer-columns {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 40px;
}

.footer-brand p {
  font-size: 0.9375rem;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.7);
  max-width: 360px;
}

.footer-links h3,
.footer-legal h3 {
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: 16px;
}

.footer-links ul,
.footer-legal ul {
  list-style: none;
}

.footer-links ul li,
.footer-legal ul li {
  margin-bottom: 10px;
}

.footer-links ul li a,
.footer-legal ul li a {
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.9375rem;
}

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

.copyright {
  max-width: var(--container-width);
  margin: 32px auto 0;
  padding: 16px 24px 0;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  font-size: 0.8125rem;
  color: rgba(255, 255, 255, 0.5);
  text-align: center;
}

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

/* 首页首屏 */
.hero-section {
  background-color: var(--color-white);
  border-bottom: 1px solid var(--color-border);
}

.hero-layout {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 56px 24px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.hero-text h1 {
  font-size: 2.25rem;
  margin-bottom: 16px;
}

.hero-lead {
  font-size: 1.125rem;
  color: var(--color-text);
  margin-bottom: 12px;
}

.hero-meta {
  font-size: 0.9375rem;
  color: var(--color-text-light);
}

.hero-entries {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.entry-card {
  display: block;
  padding: 20px;
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  transition: box-shadow var(--transition), border-color var(--transition), transform var(--transition);
}

.entry-card:hover {
  box-shadow: var(--shadow-card-hover);
  border-color: var(--color-primary);
  transform: translateY(-2px);
}

.entry-title {
  display: block;
  font-family: var(--font-serif);
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-dark);
  margin-bottom: 6px;
}

.entry-desc {
  display: block;
  font-size: 0.875rem;
  color: var(--color-text-light);
  line-height: 1.5;
}

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

.hero-figure img {
  width: 100%;
  height: 320px;
  object-fit: cover;
}

/* 区块通用 */
.section-intro {
  font-size: 1rem;
  color: var(--color-text-light);
  max-width: var(--content-width);
}

.section-link {
  display: inline-block;
  margin-top: 20px;
  font-weight: 700;
  font-size: 0.9375rem;
}

/* 首页横向时间线 */
.timeline-horizontal {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-top: 32px;
}

.timeline-item {
  position: relative;
  padding: 24px 20px 20px;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  text-align: center;
}

.timeline-dot {
  display: inline-block;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background-color: var(--color-primary);
  border: 3px solid var(--color-accent);
  margin-bottom: 12px;
}

.timeline-item h3 {
  font-size: 1.0625rem;
  margin-bottom: 8px;
}

.timeline-item p {
  font-size: 0.875rem;
  color: var(--color-text-light);
  margin-bottom: 0;
}

/* 课程模块网格 */
.module-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-top: 32px;
}

.module-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 20px;
  transition: box-shadow var(--transition), transform var(--transition);
}

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

.module-card img {
  width: 100%;
  height: 160px;
  object-fit: cover;
  border-radius: var(--radius-sm);
  margin-bottom: 16px;
}

.module-card h3 {
  font-size: 1.0625rem;
  margin-bottom: 8px;
}

.module-card p {
  font-size: 0.875rem;
  color: var(--color-text-light);
  margin-bottom: 12px;
  line-height: 1.6;
}

.module-card a {
  font-size: 0.875rem;
  font-weight: 700;
}

/* 练习建议 */
.tips-list {
  list-style: none;
  margin-top: 24px;
}

.tip-item {
  padding: 20px 24px;
  background-color: var(--color-white);
  border-left: 4px solid var(--color-primary);
  border-radius: 0 var(--radius) var(--radius) 0;
  margin-bottom: 16px;
}

.tip-item h3 {
  font-size: 1rem;
  margin-bottom: 6px;
}

.tip-item p {
  font-size: 0.9375rem;
  color: var(--color-text-light);
  margin-bottom: 0;
}

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

.faq-item summary {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 20px;
  font-weight: 700;
  font-size: 0.9375rem;
  color: var(--color-dark);
  cursor: pointer;
  transition: background-color var(--transition);
}

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

.faq-item summary::after {
  content: "+";
  font-size: 1.25rem;
  color: var(--color-primary);
  flex-shrink: 0;
  margin-left: 12px;
  transition: transform var(--transition);
}

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

.faq-item p {
  padding: 0 20px 16px;
  font-size: 0.9375rem;
  color: var(--color-text);
  margin-bottom: 0;
  line-height: 1.7;
}

/* 首页来源说明 */
.source-note {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 32px;
  margin-top: 48px;
}

.source-note h2 {
  font-size: 1.25rem;
}

.source-note p {
  font-size: 0.9375rem;
  color: var(--color-text-light);
  margin-bottom: 0;
}

/* 内页纵向时间线 */
.path-timeline {
  list-style: none;
  margin-top: 32px;
  position: relative;
  padding-left: 32px;
}

.path-timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 8px;
  bottom: 8px;
  width: 3px;
  background-color: var(--color-accent);
  border-radius: 2px;
}

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

.path-item::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 28px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background-color: var(--color-primary);
  border: 3px solid var(--color-white);
  box-shadow: 0 0 0 2px var(--color-accent);
}

.path-item h3 {
  font-size: 1.125rem;
  margin-bottom: 8px;
}

.path-item p {
  font-size: 0.9375rem;
  color: var(--color-text-light);
  margin-bottom: 0;
}

/* 路径图 */
.path-figure {
  margin: 32px 0;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-card);
}

.path-figure img {
  width: 100%;
  height: 260px;
  object-fit: cover;
}

/* 阶段卡片 */
.stage-card-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-top: 32px;
}

.stage-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 24px;
  transition: box-shadow var(--transition);
}

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

.stage-card h3 {
  font-size: 1.125rem;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--color-accent);
}

.stage-card p {
  font-size: 0.9375rem;
  color: var(--color-text);
}

.stage-card p strong {
  color: var(--color-dark);
}

.stage-card ul {
  list-style: disc;
  padding-left: 20px;
  margin-bottom: 12px;
}

.stage-card ul li {
  font-size: 0.875rem;
  color: var(--color-text-light);
  margin-bottom: 6px;
}

.stage-card p:last-child {
  margin-bottom: 0;
}

.stage-card p a {
  font-weight: 700;
  font-size: 0.875rem;
}

/* 步骤列表 */
.steps-list {
  list-style: none;
  counter-reset: step-counter;
  margin-top: 32px;
}

.step-item {
  position: relative;
  padding: 24px 24px 24px 72px;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  margin-bottom: 16px;
  counter-increment: step-counter;
}

.step-item::before {
  content: counter(step-counter);
  position: absolute;
  left: 20px;
  top: 24px;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background-color: var(--color-primary);
  color: var(--color-white);
  font-family: var(--font-serif);
  font-size: 1.125rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}

.step-item h3 {
  font-size: 1.0625rem;
  margin-bottom: 8px;
}

.step-item p {
  font-size: 0.9375rem;
  color: var(--color-text-light);
  margin-bottom: 0;
}

.step-item p a {
  font-weight: 600;
}

/* 内容图 */
.content-figure {
  margin: 32px 0;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-card);
}

.content-figure img {
  width: 100%;
  height: 280px;
  object-fit: cover;
}

/* 计划建议 */
.plan-tips {
  margin-top: 48px;
}

.plan-tips .tips-list {
  list-style: disc;
  padding-left: 20px;
}

.plan-tips .tips-list li {
  font-size: 0.9375rem;
  color: var(--color-text);
  margin-bottom: 8px;
}

.plan-tips > p {
  font-size: 0.9375rem;
  color: var(--color-text-light);
}

/* 基础课程 — 课程列表 */
.course-module-list {
  margin-bottom: 48px;
}

.course-module-list .module-card {
  margin-bottom: 16px;
}

.course-module-list .module-card h3 {
  font-size: 1.125rem;
  margin-bottom: 8px;
}

.course-module-list .module-card p {
  font-size: 0.9375rem;
  color: var(--color-text-light);
  margin-bottom: 12px;
}

.course-module-list .module-card .module-goal {
  font-size: 0.875rem;
  color: var(--color-text);
  background-color: var(--color-bg);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  margin-bottom: 0;
}

.course-module-list .module-card .module-goal strong {
  color: var(--color-primary);
}

.content-media {
  margin: 24px 0;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-card);
}

.content-media img {
  width: 100%;
  height: 260px;
  object-fit: cover;
}

.content-media-inline {
  margin: 24px 0 32px;
}

/* 练习列表（有序） */
.practice-list {
  list-style: none;
  counter-reset: practice-counter;
  margin-top: 24px;
}

.practice-item {
  position: relative;
  padding: 20px 20px 20px 64px;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  margin-bottom: 16px;
  counter-increment: practice-counter;
}

.practice-item::before {
  content: counter(practice-counter);
  position: absolute;
  left: 16px;
  top: 20px;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background-color: var(--color-accent);
  color: var(--color-dark);
  font-family: var(--font-serif);
  font-size: 1rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}

.practice-item h3 {
  font-size: 1rem;
  margin-bottom: 6px;
}

.practice-item p {
  font-size: 0.9375rem;
  color: var(--color-text-light);
  margin-bottom: 0;
}

/* 相关链接 */
.related-links {
  margin-top: 48px;
  padding: 32px;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.related-links h2 {
  font-size: 1.25rem;
}

.related-links p {
  font-size: 0.9375rem;
  color: var(--color-text-light);
}

.related-links p a {
  font-weight: 700;
  margin-right: 16px;
  display: inline-block;
}

/* 进阶页 — 双栏布局 */
.page-layout {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 40px;
  align-items: start;
}

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

/* 进阶页模块卡片 */
.page-advanced-course .course-modules .module-card {
  margin-bottom: 16px;
}

.page-advanced-course .course-modules .module-card h3 {
  font-size: 1.125rem;
  margin-bottom: 8px;
}

.page-advanced-course .course-modules .module-card p {
  font-size: 0.9375rem;
  color: var(--color-text-light);
  margin-bottom: 0;
}

.media-figure {
  margin: 32px 0;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-card);
}

.media-figure img {
  width: 100%;
  height: 280px;
  object-fit: cover;
}

/* 进阶练习 */
.practice-methods {
  margin-top: 48px;
}

.practice-methods .practice-list {
  margin-bottom: 24px;
}

.practice-methods > p:last-child a {
  font-weight: 700;
  margin-right: 16px;
  display: inline-block;
}

/* 侧栏 */
.sidebar-info {
  position: sticky;
  top: calc(var(--header-height) + 24px);
}

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

.sidebar-card h2 {
  font-size: 1.125rem;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--color-accent);
}

.sidebar-card ul {
  list-style: none;
}

.sidebar-card ul li {
  margin-bottom: 10px;
}

.sidebar-card ul li a {
  font-size: 0.9375rem;
  font-weight: 600;
  display: block;
  padding: 6px 0;
  border-bottom: 1px solid var(--color-border);
}

.sidebar-card ul li a:hover {
  color: var(--color-dark);
}

.sidebar-note {
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 20px;
}

.sidebar-note p {
  font-size: 0.875rem;
  color: var(--color-text-light);
  margin-bottom: 0;
  line-height: 1.7;
}

/* 404 页面 */
.error-main {
  min-height: 70vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.error-content {
  text-align: center;
  padding: 48px 24px;
  max-width: 560px;
}

.error-content h1 {
  font-size: 3rem;
  margin-bottom: 16px;
}

.error-content p {
  font-size: 1.0625rem;
  color: var(--color-text-light);
}

.error-back-btn {
  display: inline-block;
  margin-top: 24px;
  padding: 12px 32px;
  background-color: var(--color-primary);
  color: var(--color-white);
  font-weight: 700;
  border-radius: var(--radius);
  transition: background-color var(--transition);
}

.error-back-btn:hover {
  background-color: var(--color-dark);
  color: var(--color-white);
}

/* ============================================================
   Pages — 首页模块间距
   ============================================================ */

.home-main .path-overview,
.home-main .course-modules,
.home-main .practice-tips,
.home-main .faq-preview {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 56px 24px;
}

.home-main .path-overview {
  background-color: var(--color-bg);
}

.home-main .course-modules {
  background-color: var(--color-white);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.home-main .practice-tips {
  background-color: var(--color-bg);
}

.home-main .faq-preview {
  background-color: var(--color-white);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.home-main .source-note {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 56px 24px;
}

/* ============================================================
   Pages — 内页通用内容区
   ============================================================ */

.page-content {
  max-width: var(--content-width);
}

.page-learning-path .page-content {
  max-width: 960px;
}

.page-usage-guide .page-content {
  max-width: var(--content-width);
}

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

/* 平板与窄桌面 */
@media (max-width: 1024px) {
  .hero-layout {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .hero-figure img {
    height: 280px;
  }

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

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

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

  .sidebar-info {
    position: static;
  }

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

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

  .nav-toggle {
    display: flex;
  }

  .site-nav .nav-list {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background-color: var(--color-dark);
    padding: 8px 16px 16px;
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.2);
  }

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

  .site-nav .nav-list li a {
    padding: 14px 12px;
    border-radius: var(--radius-sm);
  }

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

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

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

  .page-title {
    font-size: 1.625rem;
  }

  .hero-layout {
    padding: 40px 16px;
  }

  .hero-text h1 {
    font-size: 1.75rem;
  }

  .hero-entries {
    grid-template-columns: 1fr;
  }

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

  .home-main .path-overview,
  .home-main .course-modules,
  .home-main .practice-tips,
  .home-main .faq-preview {
    padding: 40px 16px;
  }

  .timeline-horizontal {
    grid-template-columns: 1fr;
  }

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

  .footer-columns {
    grid-template-columns: 1fr;
    gap: 32px;
    padding: 0 16px;
  }

  .footer-brand p {
    max-width: none;
  }

  .path-timeline {
    padding-left: 24px;
  }

  .path-item::before {
    left: -24px;
  }

  .step-item {
    padding: 20px 16px 20px 60px;
  }

  .step-item::before {
    left: 14px;
    width: 32px;
    height: 32px;
    font-size: 1rem;
  }

  .practice-item {
    padding: 16px 16px 16px 56px;
  }

  .practice-item::before {
    left: 12px;
    width: 30px;
    height: 30px;
    font-size: 0.9375rem;
  }

  .content-figure img,
  .path-figure img,
  .media-figure img,
  .content-media img {
    height: 200px;
  }

  .home-main .source-note {
    padding: 40px 16px;
  }

  .related-links {
    padding: 24px;
  }

  .related-links p a {
    margin-right: 12px;
    margin-bottom: 8px;
  }

  .error-content h1 {
    font-size: 2.25rem;
  }
}

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

  .timeline-horizontal {
    grid-template-columns: 1fr;
  }

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

  .hero-entries {
    grid-template-columns: 1fr;
  }

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

  .entry-card {
    padding: 16px;
  }

  .faq-item summary {
    padding: 14px 16px;
  }

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

  .path-timeline {
    padding-left: 20px;
  }

  .path-item {
    padding: 16px;
  }

  .path-item::before {
    left: -20px;
    width: 10px;
    height: 10px;
  }

  .step-item {
    padding: 16px 16px 16px 52px;
  }

  .step-item::before {
    left: 12px;
    width: 28px;
    height: 28px;
    font-size: 0.875rem;
  }

  .practice-item {
    padding: 14px 14px 14px 48px;
  }

  .practice-item::before {
    left: 10px;
    width: 26px;
    height: 26px;
    font-size: 0.8125rem;
  }

  .page-title {
    font-size: 1.5rem;
  }

  .copyright {
    text-align: center;
  }
}