/* ==========================================================================
   樱花视频画质指南 · 全站样式
   分组：base / layout / components / pages / responsive
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. base —— 变量、重置、排版基础
   -------------------------------------------------------------------------- */
:root {
  --c-wood: #3B2E25;
  --c-linen: #F5F0E8;
  --c-clay: #C4622D;
  --c-moss: #6B7A4F;
  --c-line: #D8CFC2;
  --c-ink: #2A2521;
  --c-paper: #FFFFFF;
  --c-soft: #EFE8DC;
  --c-muted: #6E6355;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas,
    "Liberation Mono", "Courier New", monospace;
  --wrap: 1120px;
  --radius: 6px;
  --radius-sm: 4px;
  --shadow-soft: 0 1px 2px rgba(59, 46, 37, .06);
}

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

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

body.site-body {
  margin: 0;
  padding: 0;
  background: var(--c-linen);
  color: var(--c-ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  text-rendering: optimizeLegibility;
}

h1,
h2,
h3,
h4 {
  margin: 0;
  color: var(--c-wood);
  font-weight: 700;
  line-height: 1.35;
}

p {
  margin: 0;
}

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

ul,
ol {
  list-style: none;
}

a {
  color: var(--c-clay);
  text-decoration: none;
  transition: color .18s ease, border-color .18s ease, background-color .18s ease;
}

a:hover,
a:focus-visible {
  color: var(--c-wood);
  text-decoration: underline;
  text-underline-offset: 3px;
}

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

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

:focus-visible {
  outline: 2px solid var(--c-clay);
  outline-offset: 2px;
}

/* --------------------------------------------------------------------------
   2. layout —— 全站骨架：容器、页头、导航、主体、页脚
   -------------------------------------------------------------------------- */

/* 2.1 顶部线索条 */
.topline-bar {
  background: var(--c-wood);
  color: var(--c-linen);
}

.topline-bar .topline-text {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 9px 24px;
  font-size: 13px;
  line-height: 1.6;
  letter-spacing: .01em;
}

.site-lead-bar {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 10px 24px;
  color: var(--c-muted);
  font-size: 13px;
  line-height: 1.6;
  border-bottom: 1px solid var(--c-line);
}

/* 2.2 页头 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: var(--c-paper);
  border-bottom: 1px solid var(--c-line);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  max-width: var(--wrap);
  min-height: 66px;
  margin: 0 auto;
  padding: 8px 24px;
}

.brand-logo {
  display: inline-flex;
  align-items: center;
  flex: 0 0 auto;
  padding: 6px 0;
  color: var(--c-wood);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: .02em;
  text-decoration: none;
}

.brand-logo:hover,
.brand-logo:focus-visible {
  color: var(--c-clay);
  text-decoration: none;
}

/* 2.3 主导航 */
.site-nav {
  flex: 1 1 auto;
  display: flex;
  justify-content: flex-end;
}

.nav-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px;
}

.nav-item > a {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 8px 13px;
  border-radius: var(--radius-sm);
  color: var(--c-wood);
  font-size: 15px;
  line-height: 1.4;
  text-decoration: none;
}

.nav-item > a:hover,
.nav-item > a:focus-visible {
  background: var(--c-soft);
  color: var(--c-clay);
  text-decoration: none;
}

.nav-item.is-current > a,
.nav-item > a.is-current {
  color: var(--c-clay);
  font-weight: 700;
  box-shadow: inset 0 -2px 0 var(--c-clay);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 0 10px;
  border: 1px solid var(--c-line);
  border-radius: var(--radius-sm);
  background: var(--c-paper);
}

.nav-toggle-bar {
  display: block;
  height: 2px;
  background: var(--c-wood);
  border-radius: 2px;
}

/* 2.4 主内容区 */
.site-main {
  display: block;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 24px;
}

.home-main {
  padding-bottom: 8px;
}

.inner-main {
  padding-top: 20px;
  padding-bottom: 40px;
}

/* 2.5 页脚 */
.site-footer {
  margin-top: 48px;
  background: var(--c-wood);
  color: #E7DFD3;
}

.footer-inner {
  display: grid;
  grid-template-columns: 1.5fr repeat(4, minmax(0, 1fr));
  gap: 28px 24px;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 40px 24px 28px;
}

.footer-brand-name {
  margin-bottom: 8px;
  color: #FFFFFF;
  font-size: 17px;
  font-weight: 700;
}

.footer-brand-desc {
  color: #C9BEB0;
  font-size: 13.5px;
  line-height: 1.7;
}

.footer-title {
  margin-bottom: 10px;
  color: #FFFFFF;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .04em;
}

.footer-list li {
  margin-bottom: 6px;
  font-size: 13.5px;
  line-height: 1.65;
}

.footer-list a {
  color: #D9CFC2;
  text-decoration: none;
}

.footer-list a:hover,
.footer-list a:focus-visible {
  color: #FFFFFF;
  text-decoration: underline;
}

.footer-text {
  color: #C9BEB0;
  font-size: 13.5px;
  line-height: 1.7;
}

.footer-bottom {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 14px 24px 26px;
  border-top: 1px solid rgba(216, 207, 194, .22);
}

.footer-copy {
  color: #B7AB9C;
  font-size: 12.5px;
  line-height: 1.7;
}

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

/* 3.1 面包屑与页面标题区 */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 4px 0 14px;
  color: var(--c-muted);
  font-size: 13.5px;
  line-height: 1.6;
}

.breadcrumb a {
  color: var(--c-muted);
  text-decoration: none;
}

.breadcrumb a:hover,
.breadcrumb a:focus-visible {
  color: var(--c-clay);
  text-decoration: underline;
}

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

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

.page-header {
  padding-bottom: 22px;
  margin-bottom: 26px;
  border-bottom: 1px solid var(--c-line);
}

.page-title {
  font-size: 34px;
  line-height: 1.3;
}

.page-description {
  max-width: 68ch;
  margin-top: 10px;
  color: var(--c-muted);
  font-size: 15.5px;
  line-height: 1.8;
}

/* 3.2 通用 section 与标题 */
.section {
  padding: 34px 0;
  border-top: 1px solid var(--c-line);
}

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

.section-head {
  margin-bottom: 20px;
}

.section-title {
  font-size: 24px;
  line-height: 1.4;
}

.section-desc,
.section-lead,
.section-intro,
.section-note {
  max-width: 68ch;
  margin-top: 8px;
  color: var(--c-muted);
  font-size: 15px;
  line-height: 1.8;
}

.section-lead a,
.section-intro a,
.section-note a {
  font-weight: 600;
}

.section-more {
  margin-top: 18px;
  font-size: 15px;
}

.link-more {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  font-weight: 600;
}

.link-more::after {
  content: "→";
  margin-left: 6px;
  font-size: 14px;
  transition: transform .18s ease;
}

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

/* 3.3 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 20px;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 600;
  line-height: 1.4;
  text-decoration: none;
}

.btn-primary {
  background: var(--c-clay);
  border-color: var(--c-clay);
  color: #FFFFFF;
}

.btn-primary:hover,
.btn-primary:focus-visible {
  background: #A94F22;
  border-color: #A94F22;
  color: #FFFFFF;
  text-decoration: none;
}

.btn-ghost {
  background: transparent;
  border-color: var(--c-wood);
  color: var(--c-wood);
}

.btn-ghost:hover,
.btn-ghost:focus-visible {
  background: var(--c-wood);
  color: var(--c-linen);
  text-decoration: none;
}

/* 3.4 图片容器与说明 */
figure {
  overflow: hidden;
  border-radius: var(--radius);
  background: var(--c-soft);
}

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

.media-caption,
.figure-caption,
.guide-media-caption {
  padding: 9px 12px;
  color: var(--c-muted);
  font-size: 12.5px;
  line-height: 1.6;
  background: var(--c-paper);
}

/* 3.5 字段列表（通用 dt/dd 结构） */
.channel-fields,
.playlist-fields,
.channel-card-fields,
.playlist-meta {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 4px 12px;
  margin-top: 12px;
  font-size: 14px;
  line-height: 1.7;
}

.channel-fields dt,
.playlist-fields dt,
.channel-card-fields dt,
.playlist-meta dt {
  color: var(--c-muted);
  white-space: nowrap;
}

.channel-fields dd,
.playlist-fields dd,
.channel-card-fields dd,
.playlist-meta dd {
  color: var(--c-ink);
}

.channel-code,
.pick-code,
.playlist-code,
.archive-date {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .02em;
}

.field-key {
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--c-moss);
}

.field-value {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--c-ink);
}

.field-label {
  display: inline-block;
  margin-right: 6px;
  color: var(--c-moss);
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: .02em;
}

/* 3.6 卡片基础（频道卡 / 片单卡） */
.channel-card,
.playlist-card {
  display: grid;
  overflow: hidden;
  background: var(--c-paper);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-soft);
  transition: border-color .18s ease, box-shadow .18s ease, transform .18s ease;
}

.channel-card:hover,
.playlist-card:hover {
  border-color: var(--c-clay);
  box-shadow: 0 3px 10px rgba(59, 46, 37, .09);
}

.channel-card h3,
.playlist-card h3 {
  font-size: 18px;
  line-height: 1.5;
}

/* 3.7 FAQ 原生展开收起 */
.faq-list {
  display: grid;
  gap: 10px;
}

.faq-item {
  background: var(--c-paper);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
}

.faq-question {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 48px;
  padding: 12px 16px;
  color: var(--c-wood);
  font-size: 15.5px;
  font-weight: 600;
  line-height: 1.6;
  cursor: pointer;
  list-style: none;
}

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

.faq-question::before {
  content: "+";
  flex: 0 0 auto;
  width: 20px;
  color: var(--c-clay);
  font-family: var(--font-mono);
  font-size: 17px;
  text-align: center;
}

.faq-item[open] > .faq-question::before {
  content: "−";
}

.faq-item[open] > .faq-question {
  border-bottom: 1px solid var(--c-line);
}

.faq-question:hover {
  color: var(--c-clay);
}

.faq-answer {
  padding: 12px 16px 14px;
  color: var(--c-ink);
  font-size: 15px;
  line-height: 1.8;
}

.faq-answer p {
  margin-bottom: 8px;
}

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

/* 3.8 相关条目列表 */
.related-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 12px;
}

.related-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 16px;
  background: var(--c-paper);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
}

.related-item a {
  font-size: 15px;
  font-weight: 600;
}

.related-note {
  color: var(--c-muted);
  font-size: 13.5px;
  line-height: 1.7;
}

/* --------------------------------------------------------------------------
   4. pages —— 首页与各内页业务模块
   -------------------------------------------------------------------------- */

/* 4.1 首页首屏工具面 */
.hero-section {
  padding: 30px 0 26px;
}

.hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
  gap: 28px;
  align-items: start;
}

.hero-intro {
  min-width: 0;
}

.hero-eyebrow {
  margin-bottom: 10px;
  color: var(--c-moss);
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .06em;
}

.hero-title {
  font-size: 34px;
  line-height: 1.28;
}

.hero-lead {
  max-width: 62ch;
  margin-top: 14px;
  color: var(--c-ink);
  font-size: 16px;
  line-height: 1.85;
}

.hero-note {
  max-width: 62ch;
  margin-top: 10px;
  color: var(--c-muted);
  font-size: 14px;
  line-height: 1.75;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}

.hero-panel {
  min-width: 0;
  padding: 18px 18px 16px;
  background: var(--c-paper);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
}

.panel-label {
  margin-bottom: 8px;
  color: var(--c-muted);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .05em;
}

.filter-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
}

.filter-tag {
  padding: 6px 12px;
  background: var(--c-soft);
  border: 1px solid var(--c-line);
  border-radius: 999px;
  color: var(--c-wood);
  font-size: 13.5px;
  line-height: 1.5;
}

.hero-picks {
  display: grid;
  gap: 8px;
}

.hero-pick {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 10px;
  align-items: center;
  padding: 9px 12px;
  background: var(--c-linen);
  border: 1px solid var(--c-line);
  border-radius: var(--radius-sm);
}

.hero-pick .pick-code {
  color: var(--c-moss);
}

.hero-pick .pick-name {
  min-width: 0;
  color: var(--c-wood);
  font-size: 14.5px;
  font-weight: 600;
  line-height: 1.5;
}

.hero-pick .pick-tag {
  color: var(--c-muted);
  font-size: 12.5px;
  white-space: nowrap;
}

.hero-media {
  margin-top: 24px;
  border: 1px solid var(--c-line);
}

.hero-media img {
  width: 100%;
  aspect-ratio: 21 / 9;
  object-fit: cover;
}

.update-strip {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-top: 18px;
  padding: 11px 16px;
  background: var(--c-paper);
  border: 1px solid var(--c-line);
  border-left: 3px solid var(--c-moss);
  border-radius: var(--radius-sm);
  font-size: 14px;
  line-height: 1.7;
}

.update-label {
  color: var(--c-moss);
  font-family: var(--font-mono);
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: .04em;
}

.update-text {
  flex: 1 1 240px;
  min-width: 0;
  color: var(--c-ink);
}

.update-link {
  font-weight: 600;
  white-space: nowrap;
}

/* 4.2 首页频道分类速览 */
.channel-list {
  display: grid;
  gap: 14px;
}

.channel-section .channel-card {
  grid-template-columns: 220px minmax(0, 1fr);
  align-items: stretch;
}

.channel-section .channel-media {
  border-radius: 0;
  background: var(--c-soft);
}

.channel-section .channel-media img {
  width: 100%;
  height: 100%;
  min-height: 148px;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.channel-body {
  min-width: 0;
  padding: 16px 18px;
}

.channel-code {
  display: inline-block;
  margin-bottom: 6px;
  color: var(--c-moss);
}

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

/* 4.3 首页专题片单入口 */
.playlist-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.playlist-section .playlist-card {
  grid-template-rows: auto 1fr;
}

.playlist-section .playlist-media {
  border-radius: 0;
}

.playlist-section .playlist-media img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.playlist-body {
  min-width: 0;
  padding: 15px 17px 17px;
}

.playlist-name {
  font-size: 17px;
}

.playlist-note {
  margin-top: 12px;
  padding-top: 10px;
  border-top: 1px dashed var(--c-line);
  color: var(--c-muted);
  font-size: 13.5px;
  line-height: 1.75;
}

/* 4.4 首页字段口径摘要 */
.glossary-columns {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
  gap: 24px;
  align-items: start;
}

.glossary-col {
  min-width: 0;
  padding: 18px;
  background: var(--c-paper);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
}

.glossary-col .col-title {
  margin-bottom: 12px;
  font-size: 18px;
}

.field-table {
  display: grid;
  grid-template-columns: minmax(120px, auto) minmax(0, 1fr);
  gap: 8px 14px;
  font-size: 14.5px;
  line-height: 1.75;
}

.field-table .field-name {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--c-moss);
}

.field-table .field-desc {
  color: var(--c-ink);
}

.boundary-list {
  display: grid;
  gap: 8px;
}

.boundary-item {
  position: relative;
  padding-left: 16px;
  color: var(--c-ink);
  font-size: 14.5px;
  line-height: 1.75;
}

.boundary-item::before {
  content: "";
  position: absolute;
  top: 11px;
  left: 0;
  width: 6px;
  height: 6px;
  background: var(--c-clay);
  border-radius: 50%;
}

.col-more {
  margin-top: 14px;
  font-size: 14.5px;
}

/* 4.5 首页整理记录速览 */
.archive-groups {
  display: grid;
  gap: 16px;
}

.archive-group {
  padding: 16px 18px;
  background: var(--c-paper);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
}

.archive-month {
  margin-bottom: 10px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--c-line);
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: .03em;
}

.archive-list {
  display: grid;
  gap: 8px;
}

.archive-item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 10px;
  align-items: baseline;
  font-size: 14.5px;
  line-height: 1.75;
}

.archive-type {
  padding: 1px 8px;
  background: var(--c-soft);
  border: 1px solid var(--c-line);
  border-radius: 999px;
  color: var(--c-moss);
  font-size: 12px;
  white-space: nowrap;
}

.archive-text {
  min-width: 0;
  color: var(--c-ink);
}

/* 4.6 首页站内栏目索引 */
.column-index {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 14px;
}

.index-col {
  min-width: 0;
  padding: 15px 16px;
  background: var(--c-paper);
  border: 1px solid var(--c-line);
  border-top: 3px solid var(--c-moss);
  border-radius: var(--radius);
}

.index-link {
  display: inline-block;
  margin-bottom: 6px;
  font-size: 15.5px;
  font-weight: 700;
}

.index-desc {
  color: var(--c-muted);
  font-size: 13.5px;
  line-height: 1.7;
}

/* 4.7 频道分类页 */
.channel-overview .channel-figure {
  margin: 18px 0;
  border: 1px solid var(--c-line);
}

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

.channel-table {
  display: block;
  overflow: hidden;
  background: var(--c-paper);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
}

.channel-table-head,
.channel-table-row {
  display: grid;
  grid-template-columns: 130px minmax(0, 1fr) minmax(0, 1.2fr);
  gap: 14px;
  padding: 12px 16px;
  align-items: baseline;
}

.channel-table-head {
  background: var(--c-soft);
  border-bottom: 1px solid var(--c-line);
  color: var(--c-wood);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .04em;
}

.channel-table-row {
  border-bottom: 1px solid var(--c-line);
  font-size: 14.5px;
  line-height: 1.7;
}

.channel-table-row:last-child {
  border-bottom: 0;
}

.channel-table-row:hover {
  background: #FBF8F3;
}

.channel-table .cell-code {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--c-moss);
}

.channel-table .cell-topic {
  color: var(--c-wood);
  font-weight: 600;
}

.channel-table .cell-type {
  color: var(--c-muted);
}

.channel-detail .channel-card {
  grid-template-columns: 240px minmax(0, 1fr);
  margin-bottom: 14px;
}

.channel-detail .channel-card:last-of-type {
  margin-bottom: 0;
}

.channel-card-media {
  border-radius: 0;
}

.channel-card-media img {
  width: 100%;
  height: 100%;
  min-height: 160px;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.channel-card-body {
  min-width: 0;
  padding: 16px 18px;
}

.channel-card-title {
  font-size: 18px;
}

.channel-card-link {
  margin-top: 12px;
  font-size: 14.5px;
}

.channel-map-list {
  display: grid;
  gap: 12px;
}

.channel-map-row {
  padding: 14px 16px;
  background: var(--c-paper);
  border: 1px solid var(--c-line);
  border-left: 3px solid var(--c-clay);
  border-radius: var(--radius-sm);
}

.channel-map-title {
  margin-bottom: 6px;
  font-size: 16.5px;
}

.channel-map-text {
  color: var(--c-ink);
  font-size: 14.5px;
  line-height: 1.75;
}

.channel-note {
  margin-top: 18px;
  padding: 13px 16px;
  background: var(--c-soft);
  border: 1px solid var(--c-line);
  border-radius: var(--radius-sm);
  color: var(--c-muted);
  font-size: 14px;
  line-height: 1.75;
}

.channel-note a {
  margin-right: 4px;
}

/* 4.8 专题片单页 */
.playlist-overview .playlist-card {
  grid-template-rows: auto 1fr;
}

.playlist-cover {
  border-radius: 0;
}

.playlist-cover img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.playlist-overview .playlist-code {
  margin-bottom: 6px;
  color: var(--c-moss);
}

.playlist-theme {
  margin-top: 8px;
  color: var(--c-muted);
  font-size: 14px;
  line-height: 1.75;
}

.order-list {
  display: grid;
  gap: 12px;
}

.order-row {
  display: grid;
  grid-template-columns: minmax(180px, 260px) minmax(0, 1fr);
  gap: 18px;
  padding: 16px 18px;
  background: var(--c-paper);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
}

.order-name {
  font-size: 16.5px;
  line-height: 1.5;
}

.order-detail {
  min-width: 0;
  display: grid;
  gap: 6px;
}

.order-logic,
.order-quality {
  color: var(--c-ink);
  font-size: 14.5px;
  line-height: 1.75;
}

.link-list {
  display: grid;
  gap: 12px;
}

.link-row {
  padding: 14px 16px;
  background: var(--c-paper);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
}

.link-from {
  margin-bottom: 6px;
  font-size: 16px;
}

.link-to {
  color: var(--c-ink);
  font-size: 14.5px;
  line-height: 1.75;
}

.link-desc {
  margin-top: 6px;
  color: var(--c-muted);
  font-size: 14px;
  line-height: 1.75;
}

.playlist-note {
  margin-top: 20px;
  padding: 16px 18px;
  background: var(--c-soft);
  border: 1px solid var(--c-line);
  border-left: 3px solid var(--c-moss);
  border-radius: var(--radius-sm);
}

.note-title {
  margin-bottom: 6px;
  font-size: 16px;
}

.note-text {
  color: var(--c-ink);
  font-size: 14.5px;
  line-height: 1.8;
}

/* 4.9 浏览指引页 */
.guide-conditions,
.guide-steps,
.guide-mismatch,
.guide-related {
  padding: 30px 0;
  border-top: 1px solid var(--c-line);
}

.condition-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 14px;
  margin-top: 18px;
}

.condition-item {
  min-width: 0;
  padding: 15px 17px;
  background: var(--c-paper);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
}

.condition-name {
  margin-bottom: 6px;
  font-size: 16.5px;
}

.condition-text {
  color: var(--c-ink);
  font-size: 14.5px;
  line-height: 1.8;
}

.guide-media {
  margin: 18px 0 22px;
  border: 1px solid var(--c-line);
}

.guide-media img {
  width: 100%;
  aspect-ratio: 21 / 9;
  object-fit: cover;
}

.step-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px;
  counter-reset: step;
}

.step-item {
  position: relative;
  min-width: 0;
  padding: 16px 17px;
  background: var(--c-paper);
  border: 1px solid var(--c-line);
  border-top: 3px solid var(--c-clay);
  border-radius: var(--radius);
}

.step-index {
  margin-bottom: 8px;
  color: var(--c-clay);
  font-family: var(--font-mono);
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: .06em;
}

.step-name {
  margin-bottom: 8px;
  font-size: 16.5px;
}

.step-text {
  color: var(--c-ink);
  font-size: 14.5px;
  line-height: 1.8;
}

.step-field {
  margin-top: 10px;
  padding-top: 9px;
  border-top: 1px dashed var(--c-line);
  color: var(--c-moss);
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.7;
}

.guide-mismatch .faq-list,
.guide-mismatch details {
  margin-top: 16px;
}

/* 4.10 字段口径页 */
.glossary-section {
  padding: 30px 0;
  border-top: 1px solid var(--c-line);
}

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

.section-figure {
  margin: 18px 0 20px;
  border: 1px solid var(--c-line);
}

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

.field-list {
  display: grid;
  grid-template-columns: minmax(150px, 220px) minmax(0, 1fr);
  gap: 10px 20px;
  padding: 18px;
  background: var(--c-paper);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  font-size: 14.5px;
  line-height: 1.8;
}

.field-term {
  font-family: var(--font-mono);
  font-size: 13.5px;
  color: var(--c-moss);
  font-weight: 700;
}

.field-desc {
  min-width: 0;
  color: var(--c-ink);
}

.split-columns {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
  margin-top: 16px;
}

.column-panel {
  min-width: 0;
  padding: 18px;
  background: var(--c-paper);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
}

.column-title {
  margin-bottom: 10px;
  font-size: 17px;
}

.column-text {
  color: var(--c-ink);
  font-size: 14.5px;
  line-height: 1.8;
}

.combo-list {
  display: grid;
  gap: 8px;
  margin-top: 12px;
}

.combo-item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 10px;
  align-items: baseline;
  font-size: 14px;
  line-height: 1.75;
}

.combo-key {
  padding: 1px 8px;
  background: var(--c-soft);
  border: 1px solid var(--c-line);
  border-radius: 999px;
  color: var(--c-wood);
  font-family: var(--font-mono);
  font-size: 12px;
  white-space: nowrap;
}

/* 4.11 整理记录页 */
.page-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
  gap: 30px;
  align-items: start;
  padding-top: 4px;
}

.archive-months,
.archive-types,
.archive-field-changes {
  min-width: 0;
}

.archive-types,
.archive-field-changes {
  padding-top: 30px;
  border-top: 1px solid var(--c-line);
}

.archive-months .archive-group {
  margin-top: 14px;
}

.archive-group-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 10px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--c-line);
}

.archive-group-head .archive-month {
  margin: 0;
  padding: 0;
  border: 0;
}

.archive-count {
  color: var(--c-muted);
  font-family: var(--font-mono);
  font-size: 12.5px;
}

.archive-entry {
  padding: 9px 0;
  border-bottom: 1px dashed var(--c-line);
}

.archive-entry:last-child {
  border-bottom: 0;
}

.archive-entry-main {
  color: var(--c-ink);
  font-size: 14.5px;
  line-height: 1.75;
}

.archive-scope {
  margin-top: 4px;
  color: var(--c-muted);
  font-size: 13px;
  line-height: 1.7;
}

.archive-figure {
  margin: 16px 0;
  border: 1px solid var(--c-line);
}

.archive-figure img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.type-list {
  display: grid;
  gap: 12px;
}

.type-item {
  padding: 14px 16px;
  background: var(--c-paper);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
}

.type-name {
  margin-bottom: 6px;
  font-size: 16px;
}

.type-desc {
  color: var(--c-ink);
  font-size: 14.5px;
  line-height: 1.75;
}

.type-scope {
  margin-top: 6px;
  color: var(--c-muted);
  font-size: 13.5px;
  line-height: 1.7;
}

.field-change-list {
  display: grid;
  gap: 12px;
}

.field-change-item {
  padding: 14px 16px;
  background: var(--c-paper);
  border: 1px solid var(--c-line);
  border-left: 3px solid var(--c-clay);
  border-radius: var(--radius-sm);
}

.field-change-name {
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 15px;
}

.field-change-desc {
  color: var(--c-ink);
  font-size: 14.5px;
  line-height: 1.75;
}

.field-change-month {
  margin-top: 6px;
  color: var(--c-moss);
  font-family: var(--font-mono);
  font-size: 12.5px;
}

/* 4.12 404 页 */
.error-main {
  padding-top: 40px;
  padding-bottom: 60px;
}

.error-panel {
  max-width: 760px;
  padding: 30px 32px;
  background: var(--c-paper);
  border: 1px solid var(--c-line);
  border-left: 4px solid var(--c-clay);
  border-radius: var(--radius);
}

.error-code {
  margin-bottom: 8px;
  color: var(--c-clay);
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .08em;
}

.error-panel h1 {
  font-size: 30px;
  line-height: 1.35;
}

.error-lead {
  margin-top: 12px;
  color: var(--c-ink);
  font-size: 16px;
  line-height: 1.8;
}

.error-reason {
  margin-top: 8px;
  color: var(--c-muted);
  font-size: 14.5px;
  line-height: 1.8;
}

.error-links {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 8px 16px;
  margin-top: 20px;
  padding-top: 18px;
  border-top: 1px solid var(--c-line);
}

.error-links a {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  font-size: 15px;
  font-weight: 600;
}

.error-home-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  margin-top: 22px;
  padding: 10px 22px;
  background: var(--c-clay);
  border-radius: var(--radius-sm);
  color: #FFFFFF;
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
}

.error-home-btn:hover,
.error-home-btn:focus-visible {
  background: #A94F22;
  color: #FFFFFF;
  text-decoration: none;
}

/* --------------------------------------------------------------------------
   5. responsive —— 960px / 640px 断点
   -------------------------------------------------------------------------- */
@media (max-width: 960px) {
  .header-inner {
    flex-wrap: wrap;
    gap: 12px;
    padding: 8px 18px;
  }

  .nav-toggle {
    display: flex;
    margin-left: auto;
  }

  .site-nav {
    flex: 1 1 100%;
    display: block;
  }

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    padding: 8px 0 4px;
    border-top: 1px solid var(--c-line);
  }

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

  .nav-item > a {
    min-height: 46px;
    padding: 10px 12px;
    border-radius: var(--radius-sm);
  }

  .nav-item.is-current > a,
  .nav-item > a.is-current {
    box-shadow: inset 3px 0 0 var(--c-clay);
  }

  .site-main,
  .topline-bar .topline-text,
  .site-lead-bar,
  .footer-inner,
  .footer-bottom {
    padding-left: 18px;
    padding-right: 18px;
  }

  .hero-inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 22px;
  }

  .hero-title {
    font-size: 28px;
  }

  .hero-media img {
    aspect-ratio: 16 / 9;
  }

  .channel-section .channel-card,
  .channel-detail .channel-card {
    grid-template-columns: minmax(0, 1fr);
  }

  .channel-section .channel-media img,
  .channel-card-media img {
    min-height: 0;
    aspect-ratio: 16 / 9;
  }

  .glossary-columns,
  .split-columns {
    grid-template-columns: minmax(0, 1fr);
    gap: 18px;
  }

  .column-index {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .channel-table-head,
  .channel-table-row {
    grid-template-columns: 110px minmax(0, 1fr) minmax(0, 1fr);
    gap: 10px;
    padding: 11px 14px;
  }

  .order-row {
    grid-template-columns: minmax(0, 1fr);
    gap: 8px;
  }

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

  .field-list .field-desc {
    margin-bottom: 10px;
  }

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

  .footer-inner {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px 20px;
  }

  .footer-brand {
    grid-column: 1 / -1;
  }
}

@media (max-width: 640px) {
  body.site-body {
    font-size: 15.5px;
  }

  .site-main,
  .topline-bar .topline-text,
  .site-lead-bar,
  .footer-inner,
  .footer-bottom {
    padding-left: 14px;
    padding-right: 14px;
  }

  .brand-logo {
    font-size: 16.5px;
  }

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

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

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

  .hero-section {
    padding-top: 22px;
  }

  .hero-actions {
    gap: 10px;
  }

  .hero-actions .btn {
    flex: 1 1 160px;
  }

  .hero-pick {
    grid-template-columns: auto minmax(0, 1fr);
    row-gap: 2px;
  }

  .hero-pick .pick-tag {
    grid-column: 2 / 3;
  }

  .update-strip {
    padding: 10px 13px;
  }

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

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

  .channel-table-head,
  .channel-table-row {
    grid-template-columns: minmax(0, 1fr);
    gap: 4px;
  }

  .channel-table-head {
    display: none;
  }

  .channel-table-row {
    padding: 13px 14px;
  }

  .channel-table .cell-code::before {
    content: "编号 ";
    color: var(--c-muted);
    font-family: var(--font-sans);
  }

  .channel-table .cell-topic::before {
    content: "题材 ";
    color: var(--c-muted);
    font-family: var(--font-sans);
    font-size: 12.5px;
  }

  .channel-table .cell-type::before {
    content: "条目 ";
    color: var(--c-muted);
    font-family: var(--font-sans);
    font-size: 12.5px;
  }

  .archive-item {
    grid-template-columns: minmax(0, 1fr);
    gap: 3px;
  }

  .archive-type {
    justify-self: start;
  }

  .combo-item {
    grid-template-columns: minmax(0, 1fr);
    gap: 3px;
  }

  .combo-key {
    justify-self: start;
  }

  .error-panel {
    padding: 22px 18px;
  }

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

  .footer-inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 20px;
  }

  .footer-brand {
    grid-column: auto;
  }
}