/* ==========================================================================
   天美在线观看 · 全站样式
   分组：base / layout / components / pages / responsive
   ========================================================================== */

/* ==========================================================================
   base
   ========================================================================== */

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  padding: 0;
  background: #F2EFE8;
  color: #1C1C1A;
  font-family: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.75;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
  margin: 0;
  font-weight: 400;
  line-height: 1.25;
  color: #1C1C1A;
}

p {
  margin: 0 0 1em;
}

p:last-child {
  margin-bottom: 0;
}

ul, ol, dl, dd, dt, figure, figcaption {
  margin: 0;
  padding: 0;
}

ul, ol {
  list-style: none;
}

img {
  display: block;
  max-width: 100%;
  height: auto;
  border: 0;
}

a {
  color: #8A4B32;
  text-decoration: none;
  transition: color 0.2s ease, border-color 0.2s ease;
}

a:hover {
  color: #6d3823;
}

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

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.9em;
  background: #ECE7DC;
  color: #5a3a2a;
  padding: 0.1em 0.4em;
  border-radius: 3px;
}

/* 数字与编号使用等宽字体 */
.precheck__num,
.exhibit__index,
.channel-list__index,
.method-steps__num,
.structure-card__num,
.order-list__num,
.step-list__num,
.aside-steps__num,
.flow-list__num,
.checklist__num,
.error-main__code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-variant-numeric: tabular-nums;
}

/* 键盘焦点可见 */
a:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 2px solid #8A4B32;
  outline-offset: 3px;
}

/* 跳转链接 */
.skip-link {
  position: absolute;
  left: 16px;
  top: -100px;
  z-index: 100;
  padding: 10px 18px;
  background: #1C1C1A;
  color: #F2EFE8;
  font-size: 14px;
  border-radius: 4px;
  transition: top 0.2s ease;
}

.skip-link:focus {
  top: 16px;
  color: #F2EFE8;
}

/* ==========================================================================
   layout
   ========================================================================== */

.site-main {
  display: block;
  width: 100%;
}

.inner-main {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 32px 0;
}

.container {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 32px;
}

/* 公告条 */
.notice-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  padding: 9px 32px;
  background: #1C1C1A;
  color: #E8E3D7;
  font-size: 13px;
  line-height: 1.5;
}

.notice-bar.is-hidden {
  display: none;
}

.notice-bar__text {
  margin: 0;
  text-align: center;
  letter-spacing: 0.01em;
}

.notice-bar__close {
  flex: none;
  width: 24px;
  height: 24px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: #E8E3D7;
  font-size: 18px;
  line-height: 1;
  border-radius: 3px;
  transition: background 0.2s ease, color 0.2s ease;
}

.notice-bar__close:hover {
  background: rgba(255, 255, 255, 0.12);
  color: #FFFFFF;
}

/* 页头 */
.site-header {
  position: relative;
  z-index: 50;
  background: #F2EFE8;
  border-bottom: 1px solid #D8D2C4;
}

.site-header__inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 32px;
  min-height: 76px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
}

.brand {
  display: flex;
  flex-direction: column;
  gap: 2px;
  color: #1C1C1A;
  flex: none;
}

.brand:hover {
  color: #1C1C1A;
}

.brand__name {
  font-size: 20px;
  font-weight: 500;
  line-height: 1.2;
  letter-spacing: 0.02em;
}

.brand__tagline {
  font-size: 11px;
  line-height: 1.3;
  color: #6E6A60;
  letter-spacing: 0.06em;
}

/* 主导航 */
.site-nav {
  flex: 1 1 auto;
  display: flex;
  justify-content: flex-end;
}

.primary-nav__list {
  display: flex;
  align-items: center;
  gap: 4px;
  flex-wrap: wrap;
}

.primary-nav__item a {
  position: relative;
  display: inline-block;
  padding: 8px 11px;
  font-size: 14px;
  color: #3a3a36;
  letter-spacing: 0.01em;
  transition: color 0.2s ease;
}

.primary-nav__item a::after {
  content: "";
  position: absolute;
  left: 11px;
  right: 11px;
  bottom: 2px;
  height: 2px;
  background: #8A4B32;
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.22s ease;
}

.primary-nav__item a:hover {
  color: #8A4B32;
}

.primary-nav__item a:hover::after,
.primary-nav__item.is-current a::after {
  transform: scaleX(1);
}

.primary-nav__item.is-current a {
  color: #8A4B32;
  font-weight: 500;
}

/* 汉堡按钮 */
.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  flex: none;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
  border: 1px solid #D8D2C4;
  border-radius: 4px;
  background: #FFFFFF;
}

.nav-toggle__bar {
  display: block;
  width: 20px;
  height: 2px;
  background: #1C1C1A;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

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

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

/* 面包屑 */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  padding: 26px 0 4px;
  font-size: 13px;
  color: #6E6A60;
}

.breadcrumb a {
  color: #6E6A60;
}

.breadcrumb a:hover {
  color: #8A4B32;
}

.breadcrumb-sep {
  color: #b8b1a2;
}

.breadcrumb-current {
  color: #1C1C1A;
}

.breadcrumb__list {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.breadcrumb__item {
  font-size: 13px;
  color: #6E6A60;
}

.breadcrumb__item a {
  color: #6E6A60;
}

.breadcrumb__item a:hover {
  color: #8A4B32;
}

.breadcrumb__item--current {
  color: #1C1C1A;
}

/* 页面标题区 */
.page-header {
  padding: 12px 0 0;
}

.page-title {
  font-size: clamp(2rem, 4vw, 3.4rem);
  font-weight: 300;
  line-height: 1.16;
  color: #1C1C1A;
  max-width: 900px;
}

/* 页脚 */
.site-footer {
  background: #1C1C1A;
  color: #C9C3B6;
  margin-top: 0;
}

.site-footer__inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: 56px 32px 40px;
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1fr;
  gap: 40px;
}

.site-footer__col--brand {
  max-width: 320px;
}

.site-footer__brand {
  font-size: 18px;
  font-weight: 500;
  color: #F2EFE8;
  margin: 0 0 12px;
  letter-spacing: 0.02em;
}

.site-footer__desc {
  font-size: 13px;
  line-height: 1.7;
  color: #9a9488;
  margin: 0;
}

.site-footer__title {
  font-size: 13px;
  font-weight: 500;
  color: #F2EFE8;
  letter-spacing: 0.08em;
  margin: 0 0 14px;
}

.site-footer__links {
  display: flex;
  flex-direction: column;
  gap: 9px;
}

.site-footer__links a {
  font-size: 13px;
  color: #9a9488;
}

.site-footer__links a:hover {
  color: #F2EFE8;
}

.site-footer__bottom {
  max-width: 1180px;
  margin: 0 auto;
  padding: 20px 32px 32px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.site-footer__note {
  margin: 0;
  font-size: 12px;
  color: #7d776b;
  letter-spacing: 0.02em;
}

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

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 24px;
  font-size: 15px;
  font-weight: 500;
  letter-spacing: 0.02em;
  border-radius: 4px;
  border: 1px solid transparent;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.btn--primary {
  background: #8A4B32;
  color: #FBF8F2;
}

.btn--primary:hover {
  background: #6d3823;
  color: #FFFFFF;
}

.btn--ghost {
  background: transparent;
  color: #1C1C1A;
  border-color: #b9b2a3;
}

.btn--ghost:hover {
  border-color: #1C1C1A;
  color: #1C1C1A;
}

/* 箭头链接 */
.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  font-weight: 500;
  color: #8A4B32;
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
}

.link-arrow::after {
  content: "→";
  font-size: 15px;
  transition: transform 0.2s ease;
}

.link-arrow:hover {
  color: #6d3823;
  border-bottom-color: #6d3823;
}

.link-arrow:hover::after {
  transform: translateX(3px);
}

.link-arrow__mark {
  display: none;
}

/* 标签 */
.tag {
  display: inline-block;
  padding: 4px 12px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: #6E6A60;
  background: #FFFFFF;
  border: 1px solid #D8D2C4;
  border-radius: 3px;
}

/* 章节标题组（首页） */
.section-head {
  margin-bottom: 36px;
  max-width: 720px;
}

.section-head__title {
  font-size: clamp(1.5rem, 2.6vw, 2.1rem);
  font-weight: 400;
  color: #1C1C1A;
  margin-bottom: 12px;
}

.section-head__desc {
  font-size: 15px;
  line-height: 1.7;
  color: #6E6A60;
  margin: 0;
}

/* 章节标题组（内页） */
.section__head {
  margin-bottom: 32px;
  max-width: 760px;
}

.section__title {
  font-size: clamp(1.4rem, 2.4vw, 1.9rem);
  font-weight: 400;
  color: #1C1C1A;
  margin-bottom: 10px;
}

.section__desc {
  font-size: 15px;
  line-height: 1.7;
  color: #6E6A60;
  margin: 0;
}

.section__lead {
  font-size: 15px;
  line-height: 1.7;
  color: #6E6A60;
  margin: 0 0 28px;
  max-width: 760px;
}

.section-intro {
  font-size: 15px;
  line-height: 1.75;
  color: #4a4740;
  margin: 0 0 22px;
  max-width: 720px;
}

.section-title {
  font-size: clamp(1.35rem, 2.2vw, 1.75rem);
  font-weight: 400;
  color: #1C1C1A;
  margin: 0 0 14px;
}

.section-lead {
  font-size: 15px;
  line-height: 1.7;
  color: #6E6A60;
  margin: 0 0 28px;
  max-width: 760px;
}

/* 内页 section 基础 */
.section {
  padding: 44px 0;
  border-top: 1px solid #D8D2C4;
}

.section:first-of-type {
  border-top: 0;
}

.section__inner {
  max-width: 100%;
}

/* 图片容器 */
.media-figure {
  margin: 0 0 28px;
  background: #E5DFD2;
  border-radius: 6px;
  overflow: hidden;
}

.media-figure img {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.media-figure__caption {
  padding: 10px 14px;
  font-size: 12px;
  line-height: 1.6;
  color: #6E6A60;
  background: #FFFFFF;
  border-top: 1px solid #D8D2C4;
}

.media-caption {
  padding: 10px 14px;
  font-size: 12px;
  line-height: 1.6;
  color: #6E6A60;
  background: #FFFFFF;
  border-top: 1px solid #D8D2C4;
}

/* 编号步骤列表（通用结构，父级限定尺寸） */
.step-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  counter-reset: step;
}

.step-list__item {
  display: grid;
  grid-template-columns: 40px 1fr;
  gap: 16px;
  padding: 18px 0;
  border-top: 1px solid #D8D2C4;
}

.step-list__item:last-child {
  border-bottom: 1px solid #D8D2C4;
}

.step-list__num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  font-size: 13px;
  font-weight: 500;
  color: #8A4B32;
  background: #FFFFFF;
  border: 1px solid #D8D2C4;
  border-radius: 50%;
}

.step-list__body {
  min-width: 0;
}

.step-list__title {
  font-size: 15px;
  font-weight: 500;
  color: #1C1C1A;
  margin: 0 0 4px;
}

.step-list__text {
  font-size: 14px;
  line-height: 1.7;
  color: #4a4740;
  margin: 0;
}

/* 相关任务带 */
.task-band {
  background: #E7E1D4;
  border-top: 1px solid #D8D2C4;
  border-bottom: 1px solid #D8D2C4;
  margin-top: 56px;
}

.task-band__inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: 30px 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}

.task-band__title {
  font-size: 15px;
  font-weight: 500;
  color: #1C1C1A;
  letter-spacing: 0.02em;
  margin: 0;
}

.task-band__text {
  font-size: 14px;
  color: #4a4740;
  margin: 0;
  flex: 1 1 260px;
}

.task-band__links {
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
}

.task-band__links a {
  font-size: 14px;
  font-weight: 500;
  color: #8A4B32;
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
}

.task-band__links a:hover {
  border-bottom-color: #8A4B32;
}

.task-band__list {
  display: flex;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
}

.task-band__item a {
  font-size: 14px;
  font-weight: 500;
  color: #8A4B32;
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
}

.task-band__item a:hover {
  border-bottom-color: #8A4B32;
}

.task-band__label {
  display: block;
  font-weight: 500;
}

.task-band__desc {
  display: block;
  font-size: 12px;
  color: #6E6A60;
  font-weight: 400;
  margin-top: 2px;
}

.task-band__link {
  font-size: 14px;
  font-weight: 500;
  color: #8A4B32;
}

/* 侧栏 */
.aside-block {
  padding: 22px 0;
  border-top: 1px solid #D8D2C4;
}

.aside-block:first-child {
  border-top: 0;
  padding-top: 0;
}

.aside-block__title {
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: #6E6A60;
  margin: 0 0 14px;
}

.aside-block__text {
  font-size: 13px;
  line-height: 1.7;
  color: #4a4740;
  margin: 0;
}

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

.aside-list__item {
  font-size: 13px;
  line-height: 1.65;
  color: #4a4740;
  padding-left: 16px;
  position: relative;
}

.aside-list__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 6px;
  height: 6px;
  background: #8A4B32;
  border-radius: 50%;
}

.aside-links {
  display: flex;
  flex-direction: column;
  gap: 9px;
}

.aside-links a {
  font-size: 13px;
  color: #8A4B32;
}

.aside-links a:hover {
  color: #6d3823;
  text-decoration: underline;
}

.aside-anchor-list {
  display: flex;
  flex-direction: column;
  gap: 9px;
}

.aside-anchor-list a {
  font-size: 13px;
  color: #8A4B32;
}

.aside-anchor-list a:hover {
  color: #6d3823;
  text-decoration: underline;
}

.aside-steps {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.aside-steps__item {
  display: grid;
  grid-template-columns: 22px 1fr;
  gap: 10px;
  font-size: 13px;
  line-height: 1.6;
  color: #4a4740;
}

.aside-steps__num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  font-size: 11px;
  color: #8A4B32;
  border: 1px solid #D8D2C4;
  border-radius: 50%;
  background: #FFFFFF;
}

/* 侧栏（corrections） */
.aside__title {
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: #6E6A60;
  margin: 0 0 12px;
}

.aside__title + .aside__title {
  margin-top: 28px;
}

.aside__lead {
  font-size: 13px;
  line-height: 1.7;
  color: #4a4740;
  margin: 0 0 14px;
}

.aside__links {
  display: flex;
  flex-direction: column;
  gap: 9px;
}

.aside__link-item a {
  font-size: 13px;
  color: #8A4B32;
}

.aside__link-item a:hover {
  color: #6d3823;
  text-decoration: underline;
}

.check-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 8px;
}

.check-list__item {
  font-size: 13px;
  line-height: 1.65;
  color: #4a4740;
  padding-left: 18px;
  position: relative;
}

.check-list__item::before {
  content: "·";
  position: absolute;
  left: 4px;
  top: -2px;
  color: #8A4B32;
  font-weight: 700;
  font-size: 18px;
}

/* 折叠问答 */
.faq-item {
  border-top: 1px solid #D8D2C4;
}

.faq-item:last-child {
  border-bottom: 1px solid #D8D2C4;
}

.faq-item__q {
  position: relative;
  padding: 18px 40px 18px 0;
  font-size: 15px;
  font-weight: 500;
  color: #1C1C1A;
  cursor: pointer;
  list-style: none;
  line-height: 1.6;
}

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

.faq-item__q::after {
  content: "+";
  position: absolute;
  right: 6px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 20px;
  font-weight: 400;
  color: #8A4B32;
  transition: transform 0.2s ease;
}

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

.faq-item__a {
  padding: 0 40px 20px 0;
  font-size: 14px;
  line-height: 1.75;
  color: #4a4740;
}

.faq-item__a p {
  margin: 0;
}

.faq-item__a a {
  color: #8A4B32;
  text-decoration: underline;
  text-underline-offset: 2px;
}

.faq-item__a a:hover {
  color: #6d3823;
}

.faq-item__more {
  display: block;
  margin-top: 12px;
  font-size: 13px;
}

/* ==========================================================================
   pages
   ========================================================================== */

/* ---------- 首页 ---------- */

.home-main {
  display: block;
}

/* 首屏 */
.hero {
  border-bottom: 1px solid #D8D2C4;
}

.hero__inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: 56px 32px 48px;
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
  gap: 56px;
  align-items: center;
}

.hero__text {
  min-width: 0;
}

.eyebrow {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: #8A4B32;
  text-transform: uppercase;
  margin: 0 0 18px;
}

.hero__title {
  font-size: clamp(2rem, 4vw, 3.4rem);
  font-weight: 300;
  line-height: 1.16;
  color: #1C1C1A;
  margin: 0 0 20px;
}

.hero__lead {
  font-size: 16px;
  line-height: 1.75;
  color: #4a4740;
  margin: 0 0 28px;
  max-width: 520px;
}

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

.hero__media {
  position: relative;
  margin: 0;
  background: #E5DFD2;
  border-radius: 6px;
  overflow: hidden;
}

.hero__media img {
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.hero__media figcaption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 12px 16px;
  font-size: 12px;
  line-height: 1.5;
  color: #F2EFE8;
  background: rgba(20, 20, 18, 0.72);
}

/* 观看前核对 */
.precheck {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 32px 48px;
}

.precheck__title {
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.1em;
  color: #6E6A60;
  margin: 0 0 18px;
}

.precheck__list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0;
  border-top: 1px solid #D8D2C4;
}

.precheck__item {
  padding: 20px 24px 20px 0;
  border-right: 1px solid #D8D2C4;
  min-width: 0;
}

.precheck__item:last-child {
  border-right: 0;
  padding-right: 0;
}

.precheck__item:not(:first-child) {
  padding-left: 24px;
}

.precheck__num {
  display: block;
  font-size: 12px;
  color: #8A4B32;
  margin-bottom: 8px;
  letter-spacing: 0.06em;
}

.precheck__name {
  font-size: 15px;
  font-weight: 500;
  color: #1C1C1A;
  margin: 0 0 6px;
}

.precheck__desc {
  font-size: 13px;
  line-height: 1.7;
  color: #6E6A60;
  margin: 0;
}

/* 专题展映目录 */
.exhibits {
  max-width: 1180px;
  margin: 0 auto;
  padding: 64px 32px;
}

.exhibit {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 48px;
  align-items: center;
  padding: 40px 0;
  border-top: 1px solid #D8D2C4;
}

.exhibit:first-of-type {
  border-top: 0;
  padding-top: 0;
}

.exhibit:last-of-type {
  padding-bottom: 0;
}

.exhibit--right .exhibit__media {
  order: 2;
}

.exhibit--right .exhibit__body {
  order: 1;
}

.exhibit__media {
  margin: 0;
  background: #E5DFD2;
  border-radius: 6px;
  overflow: hidden;
}

.exhibit__media img {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 11;
  object-fit: cover;
  transition: filter 0.3s ease;
}

.exhibit:hover .exhibit__media img {
  filter: brightness(0.94);
}

.exhibit__body {
  min-width: 0;
}

.exhibit__index {
  font-size: 12px;
  color: #8A4B32;
  letter-spacing: 0.08em;
  margin: 0 0 10px;
}

.exhibit__name {
  font-size: clamp(1.4rem, 2.4vw, 1.9rem);
  font-weight: 400;
  color: #1C1C1A;
  margin: 0 0 14px;
}

.exhibit__desc {
  font-size: 15px;
  line-height: 1.75;
  color: #4a4740;
  margin: 0 0 20px;
}

.exhibit__meta {
  display: grid;
  grid-template-columns: 84px minmax(0, 1fr);
  gap: 8px 16px;
  margin: 0 0 22px;
  padding: 16px 0;
  border-top: 1px solid #D8D2C4;
  border-bottom: 1px solid #D8D2C4;
}

.exhibit__meta dt {
  font-size: 12px;
  color: #6E6A60;
  letter-spacing: 0.04em;
}

.exhibit__meta dd {
  font-size: 14px;
  color: #1C1C1A;
  line-height: 1.6;
}

/* 频道图谱（首页） */
.channels {
  max-width: 1180px;
  margin: 0 auto;
  padding: 64px 32px;
  border-top: 1px solid #D8D2C4;
}

.channel-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0;
  border-top: 1px solid #D8D2C4;
}

.channel-item {
  padding: 22px 28px 22px 0;
  border-bottom: 1px solid #D8D2C4;
  border-right: 1px solid #D8D2C4;
  min-width: 0;
}

.channel-item:nth-child(2n) {
  border-right: 0;
  padding-right: 0;
  padding-left: 28px;
}

.channel-item__name {
  font-size: 17px;
  font-weight: 500;
  color: #1C1C1A;
  margin: 0 0 8px;
}

.channel-item__scope,
.channel-item__scene {
  font-size: 13px;
  line-height: 1.7;
  color: #6E6A60;
  margin: 0 0 4px;
}

.channel-item__link {
  margin: 10px 0 0;
}

.channel-item__link a {
  font-size: 13px;
  font-weight: 500;
  color: #8A4B32;
  border-bottom: 1px solid transparent;
  padding-bottom: 1px;
}

.channel-item__link a:hover {
  border-bottom-color: #8A4B32;
}

/* 维护原则 */
.principles {
  background: #E7E1D4;
  border-top: 1px solid #D8D2C4;
  border-bottom: 1px solid #D8D2C4;
}

.principles__inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: 56px 32px;
}

.principles__title {
  font-size: clamp(1.4rem, 2.4vw, 1.9rem);
  font-weight: 400;
  color: #1C1C1A;
  margin: 0 0 14px;
}

.principles__lead {
  font-size: 15px;
  line-height: 1.75;
  color: #4a4740;
  margin: 0 0 26px;
  max-width: 760px;
}

.principles__list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
  margin: 0 0 26px;
}

.principles__list li {
  font-size: 14px;
  line-height: 1.7;
  color: #4a4740;
  padding-top: 16px;
  border-top: 1px solid #c4bcaa;
}

.principles__links {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
}

/* 常见问题摘要 */
.faq-preview {
  max-width: 1180px;
  margin: 0 auto;
  padding: 64px 32px;
}

.faq-preview__list {
  max-width: 820px;
  border-top: 1px solid #D8D2C4;
}

.faq-preview__more {
  margin-top: 28px;
}

/* 相关内容导航 */
.related-links {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 32px 56px;
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
}

.related-links-label {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: #6E6A60;
}

.related-links-item {
  font-size: 13px;
  color: #8A4B32;
  border-bottom: 1px solid transparent;
  padding-bottom: 1px;
}

.related-links-item:hover {
  border-bottom-color: #8A4B32;
}

/* ---------- 内页通用标题区 ---------- */

.page-hero {
  padding: 20px 0 36px;
}

.page-hero__inner {
  max-width: 900px;
}

.page-hero__eyebrow {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: #8A4B32;
  margin: 0 0 12px;
}

.page-hero__lead {
  font-size: 16px;
  line-height: 1.75;
  color: #4a4740;
  margin: 0 0 20px;
}

.page-hero__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-hero__tag {
  display: inline-block;
  padding: 4px 12px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: #6E6A60;
  background: #FFFFFF;
  border: 1px solid #D8D2C4;
  border-radius: 3px;
}

/* 备选标题区（source-notes 使用） */
.page-head {
  padding: 16px 0 32px;
}

.page-head__inner {
  max-width: 900px;
}

.page-head__lead {
  font-size: 16px;
  line-height: 1.75;
  color: #4a4740;
  margin: 0 0 18px;
}

.page-head__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-head__tag {
  display: inline-block;
  padding: 4px 12px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: #6E6A60;
  background: #FFFFFF;
  border: 1px solid #D8D2C4;
  border-radius: 3px;
}

/* 主内容 + 侧栏布局 */
.page-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 56px;
  padding: 8px 0 24px;
  align-items: start;
}

.page-layout__main,
.page-main__col {
  min-width: 0;
}

.page-layout__aside,
.page-aside {
  min-width: 0;
  padding-top: 4px;
}

.page-layout--sidebar-right {
  /* 与默认一致，显式声明便于阅读 */
  grid-template-columns: minmax(0, 1fr) 300px;
}

.sidebar-left .page-layout,
.sidebar-left .page-layout--sidebar-right {
  grid-template-columns: 300px minmax(0, 1fr);
}

.sidebar-left .page-layout__aside,
.sidebar-left .page-aside {
  order: -1;
}

.content-section {
  padding: 36px 0;
  border-top: 1px solid #D8D2C4;
}

.content-section:first-child {
  border-top: 0;
  padding-top: 8px;
}

.content-section__title {
  font-size: clamp(1.3rem, 2.2vw, 1.7rem);
  font-weight: 400;
  color: #1C1C1A;
  margin: 0 0 14px;
}

.content-section__lead {
  font-size: 15px;
  line-height: 1.75;
  color: #4a4740;
  margin: 0 0 22px;
  max-width: 720px;
}

.content-section__foot {
  margin-top: 20px;
  font-size: 13px;
  color: #6E6A60;
}

/* ---------- 频道图谱 ---------- */

.page-channel-map .section--intro {
  padding-top: 8px;
}

.intro-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
}

.intro-grid__item {
  padding: 22px 22px 24px;
  background: #FFFFFF;
  border: 1px solid #D8D2C4;
  border-radius: 6px;
  min-width: 0;
}

.intro-grid__title {
  font-size: 15px;
  font-weight: 500;
  color: #1C1C1A;
  margin: 0 0 8px;
}

.intro-grid__text {
  font-size: 14px;
  line-height: 1.7;
  color: #4a4740;
  margin: 0;
}

.channel-figure {
  margin: 0 0 32px;
  background: #E5DFD2;
  border-radius: 6px;
  overflow: hidden;
}

.channel-figure img {
  width: 100%;
  height: auto;
  aspect-ratio: 21 / 9;
  object-fit: cover;
}

.channel-figure__caption {
  padding: 10px 16px;
  font-size: 12px;
  line-height: 1.6;
  color: #6E6A60;
  background: #FFFFFF;
  border-top: 1px solid #D8D2C4;
}

.page-channel-map .channel-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0;
  border-top: 1px solid #D8D2C4;
}

.channel-list__item {
  padding: 24px 28px 24px 0;
  border-bottom: 1px solid #D8D2C4;
  border-right: 1px solid #D8D2C4;
  min-width: 0;
}

.channel-list__item:nth-child(2n) {
  border-right: 0;
  padding-right: 0;
  padding-left: 28px;
}

.channel-list__term {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin: 0 0 12px;
}

.channel-list__index {
  font-size: 12px;
  color: #8A4B32;
  letter-spacing: 0.06em;
}

.channel-list__name {
  font-size: 17px;
  font-weight: 500;
  color: #1C1C1A;
}

.channel-list__desc {
  margin: 0;
}

.channel-list__scope,
.channel-list__scene {
  font-size: 13px;
  line-height: 1.7;
  color: #4a4740;
  margin: 0 0 6px;
}

.channel-list__label {
  display: inline-block;
  min-width: 62px;
  font-size: 12px;
  color: #6E6A60;
  letter-spacing: 0.04em;
}

.channel-list__link {
  display: inline-block;
  margin-top: 10px;
  font-size: 13px;
  font-weight: 500;
  color: #8A4B32;
  border-bottom: 1px solid transparent;
  padding-bottom: 1px;
}

.channel-list__link:hover {
  border-bottom-color: #8A4B32;
}

/* 频道选择方法 */
.method-steps {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
}

.method-steps__item {
  padding: 22px 22px 24px;
  background: #FFFFFF;
  border: 1px solid #D8D2C4;
  border-radius: 6px;
  min-width: 0;
}

.method-steps__num {
  display: block;
  font-size: 12px;
  color: #8A4B32;
  margin-bottom: 10px;
  letter-spacing: 0.06em;
}

.method-steps__title {
  font-size: 15px;
  font-weight: 500;
  color: #1C1C1A;
  margin: 0 0 8px;
}

.method-steps__text {
  font-size: 14px;
  line-height: 1.7;
  color: #4a4740;
  margin: 0;
}

/* 频道与专题关系 */
.relation-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
  margin-bottom: 20px;
}

.relation-list__item {
  padding: 22px 22px 24px;
  background: #FFFFFF;
  border: 1px solid #D8D2C4;
  border-radius: 6px;
  min-width: 0;
}

.relation-list__title {
  font-size: 15px;
  font-weight: 500;
  color: #1C1C1A;
  margin: 0 0 8px;
}

.relation-list__text {
  font-size: 14px;
  line-height: 1.7;
  color: #4a4740;
  margin: 0 0 12px;
}

.relation-list__link {
  font-size: 13px;
  font-weight: 500;
  color: #8A4B32;
  border-bottom: 1px solid transparent;
  padding-bottom: 1px;
}

.relation-list__link:hover {
  border-bottom-color: #8A4B32;
}

.relation-note {
  font-size: 13px;
  line-height: 1.7;
  color: #6E6A60;
  margin: 0;
}

.relation-note a {
  color: #8A4B32;
  text-decoration: underline;
  text-underline-offset: 2px;
}

/* ---------- 专题展映 ---------- */

.prose {
  max-width: 760px;
}

.prose p {
  font-size: 15px;
  line-height: 1.8;
  color: #4a4740;
  margin: 0 0 14px;
}

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

.page-features .exhibit {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 48px;
  align-items: center;
  padding: 40px 0;
  border-top: 1px solid #D8D2C4;
}

.page-features .exhibit:first-of-type {
  border-top: 0;
  padding-top: 0;
}

.page-features .exhibit--media-right .exhibit__media {
  order: 2;
}

.page-features .exhibit--media-right .exhibit__body {
  order: 1;
}

.exhibit__caption {
  padding: 10px 14px;
  font-size: 12px;
  line-height: 1.6;
  color: #6E6A60;
  background: #FFFFFF;
  border-top: 1px solid #D8D2C4;
}

.exhibit__title {
  font-size: clamp(1.4rem, 2.4vw, 1.9rem);
  font-weight: 400;
  color: #1C1C1A;
  margin: 0 0 16px;
}

.exhibit__note {
  font-size: 13px;
  line-height: 1.7;
  color: #6E6A60;
  margin: 0 0 18px;
}

/* 片单结构说明 */
.structure-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
}

.structure-card {
  padding: 22px 22px 24px;
  background: #FFFFFF;
  border: 1px solid #D8D2C4;
  border-radius: 6px;
  min-width: 0;
}

.structure-card__num {
  display: block;
  font-size: 12px;
  color: #8A4B32;
  margin-bottom: 10px;
  letter-spacing: 0.06em;
}

.structure-card__title {
  font-size: 15px;
  font-weight: 500;
  color: #1C1C1A;
  margin: 0 0 8px;
}

.structure-card__text {
  font-size: 14px;
  line-height: 1.7;
  color: #4a4740;
  margin: 0;
}

/* 观看顺序 */
.order-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
}

.order-list__item {
  padding: 22px 22px 24px;
  border-top: 2px solid #8A4B32;
  background: #FFFFFF;
  border-radius: 0 0 6px 6px;
  min-width: 0;
}

.order-list__num {
  font-size: 12px;
  color: #8A4B32;
  margin: 0 0 8px;
  letter-spacing: 0.06em;
}

.order-list__title {
  font-size: 15px;
  font-weight: 500;
  color: #1C1C1A;
  margin: 0 0 8px;
}

.order-list__text {
  font-size: 14px;
  line-height: 1.7;
  color: #4a4740;
  margin: 0;
}

/* 相关阅读 */
.related-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.related-list__item a {
  display: block;
  padding: 18px 20px;
  font-size: 14px;
  color: #1C1C1A;
  background: #FFFFFF;
  border: 1px solid #D8D2C4;
  border-radius: 6px;
  min-height: 44px;
  transition: border-color 0.2s ease, color 0.2s ease;
}

.related-list__item a:hover {
  border-color: #8A4B32;
  color: #8A4B32;
}

/* ---------- 观看准备 ---------- */

.layout-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 56px;
  padding: 8px 0 24px;
  align-items: start;
}

.layout-shell--aside-right {
  /* 与默认一致 */
  grid-template-columns: minmax(0, 1fr) 300px;
}

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

.sidebar {
  min-width: 0;
  padding-top: 4px;
}

.page-viewing-setup .content-section {
  padding: 32px 0;
}

.checklist {
  display: flex;
  flex-direction: column;
  gap: 0;
  border-top: 1px solid #D8D2C4;
}

.checklist__item {
  display: grid;
  grid-template-columns: 40px 1fr;
  gap: 16px;
  padding: 18px 0;
  border-bottom: 1px solid #D8D2C4;
  min-width: 0;
}

.checklist__num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  font-size: 13px;
  color: #8A4B32;
  background: #FFFFFF;
  border: 1px solid #D8D2C4;
  border-radius: 50%;
}

.checklist__body {
  min-width: 0;
}

.checklist__title {
  font-size: 15px;
  font-weight: 500;
  color: #1C1C1A;
  margin: 0 0 4px;
}

.info-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.info-card {
  padding: 20px 20px 22px;
  background: #FFFFFF;
  border: 1px solid #D8D2C4;
  border-radius: 6px;
  min-width: 0;
}

.info-card__title {
  font-size: 15px;
  font-weight: 500;
  color: #1C1C1A;
  margin: 0 0 8px;
}

.info-card p {
  font-size: 14px;
  line-height: 1.7;
  color: #4a4740;
  margin: 0;
}

.section-footnote {
  margin-top: 20px;
  font-size: 13px;
  line-height: 1.7;
  color: #6E6A60;
}

/* ---------- 来源与标识 ---------- */

.page-source-notes .page-main__col {
  min-width: 0;
}

.page-source-notes .page-aside {
  min-width: 0;
}

.page-source-notes .content-section {
  padding: 32px 0;
}

.note-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}

.note-card {
  padding: 20px 20px 22px;
  background: #FFFFFF;
  border: 1px solid #D8D2C4;
  border-radius: 6px;
  min-width: 0;
}

.note-card__title {
  font-size: 15px;
  font-weight: 500;
  color: #1C1C1A;
  margin: 0 0 8px;
}

.note-card__text {
  font-size: 14px;
  line-height: 1.7;
  color: #4a4740;
  margin: 0;
}

.misread-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  border-top: 1px solid #D8D2C4;
}

.misread-list__item {
  padding: 18px 0;
  border-bottom: 1px solid #D8D2C4;
}

.misread-list__wrong {
  font-size: 14px;
  line-height: 1.7;
  color: #6E6A60;
  margin: 0 0 6px;
  padding-left: 22px;
  position: relative;
}

.misread-list__wrong::before {
  content: "×";
  position: absolute;
  left: 2px;
  top: -1px;
  color: #a5674a;
  font-size: 15px;
}

.misread-list__right {
  font-size: 14px;
  line-height: 1.7;
  color: #1C1C1A;
  margin: 0;
  padding-left: 22px;
  position: relative;
}

.misread-list__right::before {
  content: "✓";
  position: absolute;
  left: 2px;
  top: 0;
  color: #8A4B32;
  font-size: 13px;
}

.link-cards {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.link-card {
  min-width: 0;
}

.link-card__link {
  display: block;
  padding: 18px 20px;
  background: #FFFFFF;
  border: 1px solid #D8D2C4;
  border-radius: 6px;
  min-height: 44px;
  transition: border-color 0.2s ease;
}

.link-card__link:hover {
  border-color: #8A4B32;
}

.link-card__title {
  display: block;
  font-size: 14px;
  font-weight: 500;
  color: #1C1C1A;
  margin-bottom: 4px;
}

.link-card__desc {
  display: block;
  font-size: 12px;
  line-height: 1.6;
  color: #6E6A60;
}

/* ---------- 常见问题 ---------- */

.page-faq .page-hero {
  padding-bottom: 32px;
}

.page-hero__media {
  margin: 24px 0 0;
  max-width: 900px;
  background: #E5DFD2;
  border-radius: 6px;
  overflow: hidden;
}

.page-hero__media img {
  width: 100%;
  height: auto;
  aspect-ratio: 21 / 9;
  object-fit: cover;
}

.page-hero__caption {
  padding: 10px 16px;
  font-size: 12px;
  line-height: 1.6;
  color: #6E6A60;
  background: #FFFFFF;
  border-top: 1px solid #D8D2C4;
}

.faq-group {
  padding: 32px 0;
  border-top: 1px solid #D8D2C4;
}

.faq-group:first-child {
  border-top: 0;
  padding-top: 8px;
}

.faq-group__head {
  margin-bottom: 18px;
}

.faq-group__title {
  font-size: clamp(1.25rem, 2vw, 1.55rem);
  font-weight: 400;
  color: #1C1C1A;
  margin: 0 0 6px;
}

.faq-group__desc {
  font-size: 14px;
  line-height: 1.7;
  color: #6E6A60;
  margin: 0;
}

.faq-list {
  border-top: 1px solid #D8D2C4;
}

/* ---------- 纠错与建议 ---------- */

.page-corrections .content-section {
  padding: 32px 0;
}

.page-corrections .step-list {
  margin-top: 20px;
}

.flow-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
  margin-top: 20px;
}

.flow-list__item {
  padding: 20px 20px 22px;
  background: #FFFFFF;
  border: 1px solid #D8D2C4;
  border-radius: 6px;
  min-width: 0;
}

.flow-list__num {
  display: block;
  font-size: 12px;
  color: #8A4B32;
  margin-bottom: 8px;
  letter-spacing: 0.06em;
}

.flow-list__title {
  font-size: 15px;
  font-weight: 500;
  color: #1C1C1A;
  margin: 0 0 8px;
}

.flow-list__text {
  font-size: 14px;
  line-height: 1.7;
  color: #4a4740;
  margin: 0;
  min-width: 0;
  overflow-wrap: break-word;
  word-break: normal;
}

.info-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  border-top: 1px solid #D8D2C4;
  margin-top: 20px;
}

.info-list__row {
  display: grid;
  grid-template-columns: 120px minmax(0, 1fr);
  gap: 16px;
  padding: 14px 0;
  border-bottom: 1px solid #D8D2C4;
  min-width: 0;
}

.info-list__term {
  font-size: 13px;
  font-weight: 500;
  color: #6E6A60;
  letter-spacing: 0.04em;
}

.info-list__desc {
  font-size: 14px;
  line-height: 1.7;
  color: #1C1C1A;
  margin: 0;
  min-width: 0;
}

.code-block {
  margin: 20px 0 0;
  padding: 20px 22px;
  background: #1C1C1A;
  color: #E8E3D7;
  border-radius: 6px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 13px;
  line-height: 1.8;
  white-space: pre-wrap;
  overflow-wrap: break-word;
  word-break: break-word;
}

.note-block {
  margin-top: 20px;
  padding: 18px 20px;
  background: #E7E1D4;
  border-left: 3px solid #8A4B32;
  border-radius: 0 4px 4px 0;
}

.note-block__title {
  font-size: 14px;
  font-weight: 500;
  color: #1C1C1A;
  margin: 0 0 6px;
}

.note-block__text {
  font-size: 13px;
  line-height: 1.7;
  color: #4a4740;
  margin: 0;
}

.scope-block {
  margin-top: 20px;
}

.scope-block__title {
  font-size: 14px;
  font-weight: 500;
  color: #1C1C1A;
  margin: 0 0 10px;
}

.scope-block__list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.scope-block__item {
  font-size: 14px;
  line-height: 1.7;
  color: #4a4740;
  padding-left: 16px;
  position: relative;
}

.scope-block__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 6px;
  height: 6px;
  background: #8A4B32;
  border-radius: 50%;
}

/* ---------- 站点说明 ---------- */

.about-section {
  padding: 44px 0;
  border-top: 1px solid #D8D2C4;
}

.about-section:first-of-type {
  border-top: 0;
  padding-top: 8px;
}

.about-position__inner {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
  gap: 48px;
  align-items: center;
}

.about-position__text {
  min-width: 0;
}

.about-position__text p {
  font-size: 15px;
  line-height: 1.8;
  color: #4a4740;
  margin: 0 0 14px;
}

.about-position__text p:last-child {
  margin-bottom: 0;
}

.about-position__media {
  margin: 0;
  background: #E5DFD2;
  border-radius: 6px;
  overflow: hidden;
}

.about-position__media img {
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.scope-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0;
  border-top: 1px solid #D8D2C4;
}

.scope-item {
  padding: 22px 28px 22px 0;
  border-bottom: 1px solid #D8D2C4;
  border-right: 1px solid #D8D2C4;
  min-width: 0;
}

.scope-item:nth-child(2n) {
  border-right: 0;
  padding-right: 0;
  padding-left: 28px;
}

.scope-item:last-child:nth-child(odd) {
  grid-column: 1 / -1;
  border-right: 0;
  padding-right: 0;
}

.scope-item__title {
  font-size: 16px;
  font-weight: 500;
  color: #1C1C1A;
  margin: 0 0 6px;
}

.scope-item__desc {
  font-size: 14px;
  line-height: 1.7;
  color: #6E6A60;
  margin: 0;
}

.principles-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}

.principle-card {
  padding: 22px 22px 24px;
  background: #FFFFFF;
  border: 1px solid #D8D2C4;
  border-radius: 6px;
  min-width: 0;
}

.principle-card--boundary {
  background: #E7E1D4;
  border-color: #c4bcaa;
}

.principle-card__title {
  font-size: 15px;
  font-weight: 500;
  color: #1C1C1A;
  margin: 0 0 8px;
}

.principle-card__desc {
  font-size: 14px;
  line-height: 1.7;
  color: #4a4740;
  margin: 0;
}

.about-history__inner {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
  gap: 48px;
  align-items: center;
  padding: 28px 0;
  border-top: 1px solid #D8D2C4;
  border-bottom: 1px solid #D8D2C4;
}

.about-history__text {
  min-width: 0;
}

.about-history__text p {
  font-size: 15px;
  line-height: 1.8;
  color: #4a4740;
  margin: 0 0 14px;
}

.about-history__text p:last-child {
  margin-bottom: 0;
}

.about-history__action {
  min-width: 0;
}

.about-history__hint {
  font-size: 13px;
  line-height: 1.7;
  color: #6E6A60;
  margin: 12px 0 0;
}

.about-history__status {
  font-size: 13px;
  line-height: 1.7;
  color: #8A4B32;
  margin: 8px 0 0;
  min-height: 1.7em;
}

/* ---------- 404 ---------- */

.error-main {
  padding: 72px 0 80px;
}

.error-main__inner {
  max-width: 720px;
}

.error-main__code {
  font-size: 13px;
  letter-spacing: 0.14em;
  color: #8A4B32;
  margin: 0 0 16px;
}

.error-main__title {
  font-size: clamp(1.8rem, 3.4vw, 2.6rem);
  font-weight: 300;
  color: #1C1C1A;
  margin: 0 0 16px;
}

.error-main__lead {
  font-size: 16px;
  line-height: 1.75;
  color: #4a4740;
  margin: 0 0 28px;
}

.error-main__actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 48px;
}

.error-main__section {
  border-top: 1px solid #D8D2C4;
  padding-top: 28px;
}

.error-main__section-title {
  font-size: 15px;
  font-weight: 500;
  color: #6E6A60;
  letter-spacing: 0.06em;
  margin: 0 0 16px;
}

.error-main__list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.error-main__item a {
  display: flex;
  align-items: center;
  min-height: 44px;
  padding: 10px 16px;
  font-size: 14px;
  color: #1C1C1A;
  background: #FFFFFF;
  border: 1px solid #D8D2C4;
  border-radius: 6px;
  transition: border-color 0.2s ease, color 0.2s ease;
}

.error-main__item a:hover {
  border-color: #8A4B32;
  color: #8A4B32;
}

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

@media (max-width: 1080px) {
  .site-header__inner {
    gap: 20px;
  }

  .primary-nav__item a {
    padding: 8px 8px;
    font-size: 13px;
  }

  .primary-nav__item a::after {
    left: 8px;
    right: 8px;
  }

  .hero__inner {
    gap: 40px;
    padding-top: 44px;
    padding-bottom: 40px;
  }

  .exhibit {
    gap: 36px;
  }

  .page-layout,
  .page-layout--sidebar-right,
  .layout-shell,
  .layout-shell--aside-right {
    grid-template-columns: minmax(0, 1fr) 268px;
    gap: 40px;
  }

  .sidebar-left .page-layout,
  .sidebar-left .page-layout--sidebar-right {
    grid-template-columns: 268px minmax(0, 1fr);
  }

  .site-footer__inner {
    grid-template-columns: 1.4fr 1fr 1fr 1fr;
    gap: 28px;
  }
}

@media (max-width: 900px) {
  .nav-toggle {
    display: inline-flex;
  }

  .site-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    justify-content: flex-start;
    background: #F2EFE8;
    border-bottom: 1px solid #D8D2C4;
    box-shadow: 0 12px 24px rgba(28, 28, 26, 0.08);
  }

  .primary-nav__list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    width: 100%;
    padding: 8px 0;
  }

  .primary-nav__list.is-open {
    display: flex;
  }

  .primary-nav__item a {
    display: flex;
    align-items: center;
    min-height: 48px;
    padding: 0 32px;
    font-size: 15px;
  }

  .primary-nav__item a::after {
    display: none;
  }

  .primary-nav__item.is-current a {
    background: #E7E1D4;
  }

  .hero__inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 32px;
  }

  .hero__lead {
    max-width: none;
  }

  .precheck__list {
    grid-template-columns: minmax(0, 1fr);
  }

  .precheck__item {
    padding: 18px 0;
    border-right: 0;
    border-bottom: 1px solid #D8D2C4;
  }

  .precheck__item:not(:first-child) {
    padding-left: 0;
  }

  .precheck__item:last-child {
    border-bottom: 0;
  }

  .exhibit,
  .page-features .exhibit {
    grid-template-columns: minmax(0, 1fr);
    gap: 24px;
  }

  .exhibit--right .exhibit__media,
  .page-features .exhibit--media-right .exhibit__media {
    order: 0;
  }

  .exhibit--right .exhibit__body,
  .page-features .exhibit--media-right .exhibit__body {
    order: 1;
  }

  .channel-list,
  .page-channel-map .channel-list {
    grid-template-columns: minmax(0, 1fr);
  }

  .channel-item,
  .channel-list__item {
    border-right: 0;
    padding-right: 0;
  }

  .channel-item:nth-child(2n),
  .channel-list__item:nth-child(2n) {
    padding-left: 0;
  }

  .intro-grid,
  .method-steps,
  .structure-grid,
  .order-list,
  .related-list,
  .info-grid,
  .flow-list,
  .link-cards,
  .principles__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .relation-list,
  .note-grid,
  .principles-grid,
  .scope-list {
    grid-template-columns: minmax(0, 1fr);
  }

  .scope-item,
  .scope-item:nth-child(2n) {
    border-right: 0;
    padding-right: 0;
    padding-left: 0;
  }

  .about-position__inner,
  .about-history__inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 28px;
  }

  .page-layout,
  .page-layout--sidebar-right,
  .page-layout--sidebar-right,
  .layout-shell,
  .layout-shell--aside-right {
    grid-template-columns: minmax(0, 1fr);
    gap: 32px;
  }

  .sidebar-left .page-layout,
  .sidebar-left .page-layout--sidebar-right {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-layout__aside,
  .page-aside,
  .sidebar {
    padding-top: 24px;
    border-top: 1px solid #D8D2C4;
  }

  .site-footer__inner {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 32px;
    padding: 44px 32px 32px;
  }

  .site-footer__col--brand {
    grid-column: 1 / -1;
    max-width: none;
  }
}

@media (max-width: 760px) {
  body {
    font-size: 16px;
    line-height: 1.7;
  }

  .notice-bar {
    padding: 8px 18px;
    gap: 10px;
    font-size: 12px;
  }

  .site-header__inner {
    min-height: 64px;
    padding: 0 18px;
    gap: 12px;
  }

  .brand__name {
    font-size: 17px;
  }

  .brand__tagline {
    font-size: 10px;
  }

  .inner-main,
  .container {
    padding-left: 18px;
    padding-right: 18px;
  }

  .breadcrumb {
    padding-top: 18px;
    font-size: 12px;
  }

  .page-title {
    font-size: clamp(1.7rem, 7vw, 2.2rem);
  }

  .page-hero {
    padding: 16px 0 28px;
  }

  .page-hero__lead,
  .page-head__lead {
    font-size: 15px;
  }

  .hero__inner {
    padding: 32px 18px 32px;
  }

  .hero__title {
    font-size: clamp(1.7rem, 7.4vw, 2.4rem);
  }

  .hero__lead {
    font-size: 15px;
  }

  .hero__actions .btn {
    flex: 1 1 auto;
  }

  .precheck {
    padding: 0 18px 36px;
  }

  .exhibits,
  .channels,
  .faq-preview {
    padding: 44px 18px;
  }

  .principles__inner {
    padding: 40px 18px;
  }

  .related-links {
    padding: 0 18px 40px;
  }

  .exhibit__meta {
    grid-template-columns: 76px minmax(0, 1fr);
    gap: 6px 12px;
  }

  .intro-grid,
  .method-steps,
  .structure-grid,
  .order-list,
  .related-list,
  .info-grid,
  .flow-list,
  .link-cards,
  .principles__list,
  .error-main__list {
    grid-template-columns: minmax(0, 1fr);
  }

  .section {
    padding: 32px 0;
  }

  .about-section {
    padding: 32px 0;
  }

  .content-section {
    padding: 26px 0;
  }

  .page-viewing-setup .content-section,
  .page-source-notes .content-section,
  .page-corrections .content-section {
    padding: 26px 0;
  }

  .step-list__item,
  .checklist__item {
    grid-template-columns: 36px minmax(0, 1fr);
    gap: 12px;
  }

  .info-list__row {
    grid-template-columns: minmax(0, 1fr);
    gap: 4px;
  }

  .task-band {
    margin-top: 40px;
  }

  .task-band__inner {
    padding: 24px 18px;
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
  }

  .task-band__links,
  .task-band__list {
    gap: 14px;
  }

  .site-footer__inner {
    padding: 36px 18px 24px;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 26px;
  }

  .site-footer__bottom {
    padding: 16px 18px 28px;
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
  }

  .error-main {
    padding: 48px 0 56px;
  }

  .channel-figure img,
  .page-hero__media img {
    aspect-ratio: 16 / 9;
  }
}

@media (max-width: 520px) {
  .primary-nav__item a {
    padding: 0 18px;
  }

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

  .hero__actions .btn {
    width: 100%;
  }

  .exhibit__name,
  .exhibit__title {
    font-size: 1.3rem;
  }

  .faq-item__q {
    padding-right: 32px;
    font-size: 14px;
  }

  .faq-item__a {
    padding-right: 0;
  }

  .site-footer__inner {
    grid-template-columns: minmax(0, 1fr);
  }

  .site-footer__col--brand {
    grid-column: auto;
  }

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

  .error-main__actions .btn {
    width: 100%;
  }

  .code-block {
    padding: 16px;
    font-size: 12px;
  }
}

/* 动效减弱偏好 */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    transition-duration: 0.001ms !important;
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
  }
}