/* ==========================================================================
   樱花视频画质指南 · 全站样式
   结构：base → layout → components → pages → responsive
   配色：文字 #10161f / 底 #f7f8fa / 卡片 #ffffff / 强调 #d6336c
   ========================================================================== */

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

:root {
  --c-text: #10161f;
  --c-text-soft: #3d4756;
  --c-text-mute: #5b6675;
  --c-bg: #f7f8fa;
  --c-surface: #ffffff;
  --c-accent: #d6336c;
  --c-line: #d5d9e0;
  --c-line-soft: #e6e9ee;
  --c-tag-bg: #eef1f5;
  --c-tag-text: #2b3442;
  --c-footer-bg: #10161f;
  --c-footer-text: #e8ebf0;
  --c-footer-line: #2c3644;
  --radius: 4px;
  --shell: 1120px;
  --col-main: 760px;
  --col-aside: 320px;
  --gap-col: 40px;
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans CJK SC", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", "Menlo", "Consolas", "Liberation Mono", monospace;
}

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

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

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

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

p {
  margin: 0;
}

ul,
ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

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

figure {
  margin: 0;
}

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

th,
td {
  text-align: left;
}

a {
  color: var(--c-text);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

a:hover {
  color: var(--c-accent);
  text-decoration-thickness: 2px;
}

a:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 3px solid var(--c-accent);
  outline-offset: 2px;
  border-radius: 2px;
}

.link-inline {
  color: var(--c-text);
  font-weight: 600;
}

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

/* ==========================================================================
   layout · 全站骨架
   ========================================================================== */

.site-header {
  background: var(--c-surface);
  border-bottom: 1px solid var(--c-line);
}

.header-inner {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 24px;
  min-height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  flex: 0 0 auto;
  color: var(--c-text);
  font-size: 19px;
  font-weight: 700;
  text-decoration: none;
  padding: 8px 0;
}

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

.site-nav {
  flex: 1 1 auto;
}

.nav-list {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 26px;
}

.nav-list li {
  flex: 0 0 auto;
}

.nav-link {
  display: inline-block;
  padding: 8px 2px;
  color: var(--c-text);
  font-size: 15px;
  text-decoration: none;
  border-bottom: 2px solid transparent;
}

.nav-link:hover {
  color: var(--c-accent);
  border-bottom-color: var(--c-line);
}

.nav-link.is-current {
  color: var(--c-accent);
  border-bottom-color: var(--c-accent);
  font-weight: 700;
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  background: var(--c-surface);
  color: var(--c-text);
  cursor: pointer;
  position: relative;
}

.nav-toggle::before {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  top: 15px;
  height: 2px;
  background: currentColor;
  box-shadow: 0 6px 0 currentColor, 0 -6px 0 currentColor;
}

.site-main {
  display: block;
}

.home-main {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 24px 64px;
}

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

.site-footer {
  background: var(--c-footer-bg);
  color: var(--c-footer-text);
}

.footer-inner {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 44px 24px 28px;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 32px;
}

.footer-title {
  color: #ffffff;
  font-size: 15px;
  margin-bottom: 12px;
}

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

.footer-list a {
  color: var(--c-footer-text);
  font-size: 14px;
  text-decoration: none;
}

.footer-list a:hover {
  color: #ffffff;
  text-decoration: underline;
}

.footer-text {
  color: #b9c2cf;
  font-size: 13px;
  line-height: 1.7;
  margin-top: 10px;
}

.footer-copy {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 16px 24px 28px;
  border-top: 1px solid var(--c-footer-line);
  color: #9aa5b4;
  font-size: 13px;
}

/* ==========================================================================
   components · 通用模块
   ========================================================================== */

.section-title {
  font-size: 22px;
  margin-bottom: 8px;
}

.section-desc,
.section-lead,
.section-note {
  color: var(--c-text-soft);
  font-size: 15px;
  max-width: 760px;
  margin-bottom: 20px;
}

.section-note a {
  color: var(--c-text);
  font-weight: 600;
}

.section-note a:hover {
  color: var(--c-accent);
}

.table-caption {
  font-size: 17px;
  margin-bottom: 10px;
}

.table-note {
  margin-top: 12px;
  font-size: 14px;
  color: var(--c-text-mute);
}

/* 字段表格 */
.field-table,
.tier-table {
  background: var(--c-surface);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  font-size: 14px;
  font-variant-numeric: tabular-nums;
}

.field-table caption,
.tier-table caption {
  caption-side: top;
  text-align: left;
  padding: 10px 12px;
  font-size: 14px;
  color: var(--c-text-mute);
}

.field-table th,
.field-table td,
.tier-table th,
.tier-table td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--c-line-soft);
  vertical-align: top;
}

.field-table thead th,
.tier-table thead th {
  background: var(--c-tag-bg);
  color: var(--c-tag-text);
  font-size: 13px;
  font-weight: 700;
  white-space: nowrap;
  border-bottom: 1px solid var(--c-line);
}

.field-table tbody tr:last-child td,
.tier-table tbody tr:last-child th,
.tier-table tbody tr:last-child td {
  border-bottom: 0;
}

.field-table tbody tr:hover td,
.tier-table tbody tr:hover th,
.tier-table tbody tr:hover td {
  background: #f2f4f7;
}

.col-code {
  font-family: var(--font-mono);
  color: var(--c-text-mute);
  white-space: nowrap;
}

.table-wrap {
  overflow-x: auto;
}

/* 片单卡（首页横向三卡） */
.collection-card-row {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.collection-card {
  background: var(--c-surface);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.card-media {
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--c-tag-bg);
}

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

.card-title {
  font-size: 17px;
  margin: 14px 16px 6px;
}

.card-title a {
  color: var(--c-text);
  text-decoration: none;
}

.card-title a:hover {
  color: var(--c-accent);
  text-decoration: underline;
}

.card-angle {
  margin: 0 16px 8px;
  color: var(--c-text-soft);
  font-size: 14px;
}

.card-meta {
  margin: auto 16px 16px;
  padding-top: 8px;
  color: var(--c-text-mute);
  font-size: 13px;
  border-top: 1px solid var(--c-line-soft);
}

/* 站内栏目索引 · 首页五列 */
.site-index {
  padding: 34px 0 8px;
  border-top: 1px solid var(--c-line);
  margin-top: 44px;
}

.index-columns {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 20px;
}

.index-col {
  background: var(--c-surface);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  padding: 16px;
}

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

.index-title a {
  color: var(--c-text);
  text-decoration: none;
}

.index-title a:hover {
  color: var(--c-accent);
  text-decoration: underline;
}

.index-desc {
  color: var(--c-text-mute);
  font-size: 13px;
  line-height: 1.65;
}

/* ==========================================================================
   pages · 首页
   ========================================================================== */

.top-fact-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 16px;
  margin: 24px 0 28px;
  background: var(--c-surface);
  border: 1px solid var(--c-line);
  border-left: 4px solid var(--c-accent);
  border-radius: var(--radius);
}

.fact-text {
  font-size: 14px;
  color: var(--c-text-soft);
  max-width: 760px;
}

.fact-stage {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--c-tag-text);
  background: var(--c-tag-bg);
  border-radius: var(--radius);
  padding: 3px 10px;
  white-space: nowrap;
}

.hero-table {
  display: grid;
  grid-template-columns: 5fr 7fr;
  gap: var(--gap-col);
  align-items: start;
  padding-bottom: 44px;
  border-bottom: 1px solid var(--c-line);
}

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

.hero-title {
  font-size: 32px;
  margin-bottom: 14px;
}

.hero-desc {
  color: var(--c-text-soft);
  margin-bottom: 20px;
}

.hero-figure {
  background: var(--c-surface);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  overflow: hidden;
  margin-bottom: 18px;
}

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

.hero-figure figcaption {
  padding: 10px 14px;
  font-size: 13px;
  color: var(--c-text-mute);
  border-top: 1px solid var(--c-line-soft);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
  font-size: 15px;
}

.hero-table-wrap {
  min-width: 0;
}

/* 主推荐片单区 */
.main-recommend {
  padding: 44px 0;
  border-bottom: 1px solid var(--c-line);
}

/* 次推荐 + 最新动态 */
.secondary-and-updates {
  display: grid;
  grid-template-columns: 7fr 5fr;
  gap: var(--gap-col);
  padding: 44px 0;
  border-bottom: 1px solid var(--c-line);
}

.secondary-list,
.update-list {
  min-width: 0;
}

.entry-list {
  border-top: 1px solid var(--c-line);
}

.entry-item {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: baseline;
  gap: 12px;
  padding: 12px 2px;
  border-bottom: 1px solid var(--c-line-soft);
}

.entry-code {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--c-text-mute);
}

.entry-link {
  color: var(--c-text);
  font-weight: 600;
  text-decoration: none;
}

.entry-link:hover {
  color: var(--c-accent);
  text-decoration: underline;
}

.entry-field {
  font-size: 13px;
  color: var(--c-tag-text);
  background: var(--c-tag-bg);
  border-radius: var(--radius);
  padding: 2px 8px;
  white-space: nowrap;
}

.update-items {
  border-top: 1px solid var(--c-line);
}

.update-item {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 14px;
  padding: 12px 2px;
  border-bottom: 1px solid var(--c-line-soft);
}

.update-time {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--c-text-mute);
  white-space: nowrap;
}

.update-link {
  color: var(--c-text);
  font-size: 15px;
}

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

/* 画质字段口径速读 */
.field-summary {
  padding: 44px 0;
  border-bottom: 1px solid var(--c-line);
}

.field-summary-cols {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--gap-col);
  align-items: start;
}

.field-name-col,
.field-tip-col {
  min-width: 0;
}

.col-title {
  font-size: 17px;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--c-line);
}

.field-name-list,
.field-tip-list {
  display: flex;
  flex-direction: column;
}

.field-name-item {
  padding: 9px 0;
  border-bottom: 1px dashed var(--c-line-soft);
}

.field-term {
  font-weight: 600;
  font-size: 15px;
}

.field-tip-item {
  padding: 9px 0;
  border-bottom: 1px dashed var(--c-line-soft);
  color: var(--c-text-soft);
  font-size: 14px;
}

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

/* 浏览顺序四步 */
.browse-steps {
  padding: 44px 0;
  border-bottom: 1px solid var(--c-line);
}

.step-list {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 20px;
  counter-reset: step;
}

.step-item {
  background: var(--c-surface);
  border: 1px solid var(--c-line);
  border-top: 3px solid var(--c-accent);
  border-radius: var(--radius);
  padding: 16px;
  counter-increment: step;
}

.step-name {
  font-size: 17px;
  margin-bottom: 8px;
}

.step-name::before {
  content: counter(step) ". ";
  font-family: var(--font-mono);
  color: var(--c-accent);
}

.step-basis {
  font-size: 14px;
  color: var(--c-text-soft);
  margin-bottom: 8px;
}

.step-field {
  font-size: 13px;
  color: var(--c-text-mute);
  padding-top: 8px;
  border-top: 1px solid var(--c-line-soft);
}

/* ==========================================================================
   pages · 内页通用外壳
   ========================================================================== */

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 18px 0 0;
  font-size: 14px;
  color: var(--c-text-mute);
}

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

.breadcrumb a:hover {
  color: var(--c-accent);
  text-decoration: underline;
}

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

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

.page-header {
  padding: 16px 0 26px;
  border-bottom: 1px solid var(--c-line);
  margin-bottom: 32px;
}

.page-title {
  font-size: 32px;
  margin-bottom: 12px;
}

.page-description {
  color: var(--c-text-soft);
  max-width: 760px;
}

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

.page-layout {
  display: grid;
  grid-template-columns: minmax(0, var(--col-main)) minmax(0, var(--col-aside));
  gap: var(--gap-col);
  align-items: start;
}

.layout-shell {
  grid-template-columns: minmax(0, 1fr) minmax(0, var(--col-aside));
}

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

.sidebar {
  min-width: 0;
  position: sticky;
  top: 20px;
}

.sidebar-block {
  background: var(--c-surface);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 20px;
}

.sidebar-title {
  font-size: 16px;
  margin-bottom: 10px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--c-line-soft);
}

.sidebar-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 9px 0;
  border-bottom: 1px dashed var(--c-line-soft);
}

.sidebar-item:last-child {
  border-bottom: 0;
}

.field-name {
  font-weight: 600;
  font-size: 14px;
}

.field-hint {
  font-size: 13px;
  color: var(--c-text-mute);
}

/* 内页站内索引 */
.site-index-list {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 16px;
}

.site-index-item {
  min-width: 0;
}

.site-index-item a {
  display: block;
  padding: 12px 14px;
  background: var(--c-surface);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  color: var(--c-text);
  font-weight: 600;
  text-decoration: none;
}

.site-index-item a:hover {
  color: var(--c-accent);
  border-color: var(--c-accent);
  text-decoration: underline;
}

.site-index-title {
  font-size: 22px;
  margin-bottom: 16px;
}

/* ==========================================================================
   pages · 频道分类
   ========================================================================== */

.channel-list {
  min-width: 0;
}

.channel-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 240px);
  gap: 24px;
  padding: 20px 0;
  border-bottom: 1px solid var(--c-line);
}

.channel-row:first-of-type {
  border-top: 1px solid var(--c-line);
}

.channel-row:hover {
  background: #f1f3f6;
}

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

.channel-name {
  font-size: 17px;
  margin-bottom: 8px;
  display: flex;
  align-items: baseline;
  gap: 10px;
  flex-wrap: wrap;
}

.channel-code {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--c-tag-text);
  background: var(--c-tag-bg);
  border-radius: var(--radius);
  padding: 2px 8px;
}

.channel-scope {
  color: var(--c-text-soft);
  font-size: 14px;
  margin-bottom: 6px;
}

.channel-scene {
  color: var(--c-text-mute);
  font-size: 14px;
}

.channel-meta {
  min-width: 0;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 8px;
}

.channel-tier {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.tier-tag {
  font-size: 12px;
  font-family: var(--font-mono);
  color: var(--c-tag-text);
  background: var(--c-tag-bg);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  padding: 2px 8px;
  white-space: nowrap;
}

.channel-fields {
  font-size: 13px;
  color: var(--c-text-mute);
}

.channel-link {
  font-size: 14px;
  font-weight: 600;
  color: var(--c-text);
}

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

.channel-bridge {
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid var(--c-line);
}

.bridge-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.bridge-item {
  background: var(--c-surface);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  padding: 14px 16px;
  min-width: 0;
}

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

.bridge-desc {
  font-size: 14px;
  color: var(--c-text-soft);
  margin-bottom: 8px;
}

.bridge-link {
  font-size: 14px;
  font-weight: 600;
}

.channel-tier-table {
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid var(--c-line);
}

.channel-figure {
  margin-bottom: 18px;
  background: var(--c-surface);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  overflow: hidden;
}

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

.channel-figure figcaption {
  padding: 10px 14px;
  font-size: 13px;
  color: var(--c-text-mute);
  border-top: 1px solid var(--c-line-soft);
}

/* 频道页右侧栏 */
.page-aside {
  min-width: 0;
  position: sticky;
  top: 20px;
}

.aside-title {
  font-size: 18px;
  margin-bottom: 14px;
}

.aside-block {
  background: var(--c-surface);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 20px;
}

.aside-subtitle {
  font-size: 16px;
  margin-bottom: 8px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--c-line-soft);
}

.aside-text {
  font-size: 14px;
  color: var(--c-text-soft);
  margin-bottom: 10px;
}

.aside-list li {
  padding: 7px 0;
  border-bottom: 1px dashed var(--c-line-soft);
  font-size: 14px;
}

.aside-list li:last-child {
  border-bottom: 0;
}

.aside-links {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 14px;
}

/* ==========================================================================
   pages · 专题片单
   ========================================================================== */

.collection-groups {
  min-width: 0;
}

.collection-groups .collection-card {
  flex-direction: row;
  margin-bottom: 20px;
}

.collection-media {
  flex: 0 0 240px;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--c-tag-bg);
}

.collection-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.collection-body {
  flex: 1 1 auto;
  min-width: 0;
  padding: 16px 18px;
  display: flex;
  flex-direction: column;
}

.collection-name {
  font-size: 18px;
  margin-bottom: 8px;
}

.collection-angle {
  font-size: 14px;
  color: var(--c-text-soft);
  margin-bottom: 12px;
}

.collection-meta {
  margin: auto 0 0;
  padding-top: 10px;
  border-top: 1px solid var(--c-line-soft);
  display: flex;
  flex-wrap: wrap;
  gap: 6px 24px;
  font-size: 13px;
}

.collection-meta dt {
  color: var(--c-text-mute);
}

.collection-meta dd {
  margin: 0;
  color: var(--c-text);
  font-family: var(--font-mono);
}

.collection-meta dt,
.collection-meta dd {
  display: inline-block;
}

.collection-fields {
  margin-top: 36px;
  padding-top: 28px;
  border-top: 1px solid var(--c-line);
}

/* ==========================================================================
   pages · 字段口径
   ========================================================================== */

.field-figure {
  margin-bottom: 28px;
  background: var(--c-surface);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  overflow: hidden;
}

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

.field-figure-caption {
  padding: 10px 14px;
  font-size: 13px;
  color: var(--c-text-mute);
  border-top: 1px solid var(--c-line-soft);
}

.field-definitions {
  margin-bottom: 36px;
}

.field-item {
  background: var(--c-surface);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  margin-bottom: 10px;
}

.field-item[open] {
  border-color: var(--c-line);
}

.field-summary {
  cursor: pointer;
  padding: 13px 16px;
  font-size: 16px;
  font-weight: 700;
  color: var(--c-text);
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

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

.field-summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--c-accent);
  flex: 0 0 auto;
}

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

.field-summary:hover {
  background: #f2f4f7;
}

.field-body {
  padding: 0 16px 16px;
  border-top: 1px solid var(--c-line-soft);
}

.field-meaning {
  margin-top: 12px;
  font-size: 15px;
  color: var(--c-text-soft);
}

.field-range {
  margin-top: 8px;
  font-size: 14px;
  color: var(--c-text-mute);
  font-variant-numeric: tabular-nums;
}

.tradeoff-advice {
  margin-bottom: 36px;
  padding-top: 28px;
  border-top: 1px solid var(--c-line);
}

.advice-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.advice-item {
  background: var(--c-surface);
  border: 1px solid var(--c-line);
  border-left: 3px solid var(--c-accent);
  border-radius: var(--radius);
  padding: 14px 16px;
  min-width: 0;
}

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

.advice-text {
  font-size: 14px;
  color: var(--c-text-soft);
}

.reading-order {
  margin-bottom: 36px;
  padding-top: 28px;
  border-top: 1px solid var(--c-line);
}

.reading-columns {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--gap-col);
  align-items: start;
}

.reading-col {
  min-width: 0;
}

.reading-steps {
  list-style: decimal;
  padding-left: 20px;
}

.reading-steps li {
  padding: 7px 0;
  font-size: 14px;
  color: var(--c-text-soft);
  border-bottom: 1px dashed var(--c-line-soft);
}

.reading-step {
  font-size: 14px;
}

.misconception-list {
  display: flex;
  flex-direction: column;
}

.misconception-item {
  padding: 8px 0;
  font-size: 14px;
  color: var(--c-text-soft);
  border-bottom: 1px dashed var(--c-line-soft);
}

.related-links {
  padding-top: 28px;
  border-top: 1px solid var(--c-line);
}

.related-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.related-item {
  min-width: 0;
}

.related-item a {
  display: block;
  padding: 12px 14px;
  background: var(--c-surface);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  font-weight: 600;
  text-decoration: none;
  color: var(--c-text);
}

.related-item a:hover {
  color: var(--c-accent);
  border-color: var(--c-accent);
  text-decoration: underline;
}

/* ==========================================================================
   pages · 整理记录
   ========================================================================== */

.record-groups {
  min-width: 0;
}

.record-group {
  padding-bottom: 28px;
  margin-bottom: 28px;
  border-bottom: 1px solid var(--c-line);
}

.record-stage {
  font-size: 20px;
  margin-bottom: 14px;
  padding-left: 12px;
  border-left: 4px solid var(--c-accent);
}

.record-figure {
  margin-bottom: 16px;
  background: var(--c-surface);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  overflow: hidden;
}

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

.record-figure figcaption {
  padding: 10px 14px;
  font-size: 13px;
  color: var(--c-text-mute);
  border-top: 1px solid var(--c-line-soft);
}

.record-list {
  list-style: decimal;
  padding-left: 20px;
}

.record-item {
  padding: 12px 0 14px;
  border-bottom: 1px dashed var(--c-line-soft);
}

.record-item:last-child {
  border-bottom: 0;
}

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

.record-scope {
  font-size: 14px;
  color: var(--c-text-soft);
  margin-bottom: 4px;
}

.record-reason {
  font-size: 14px;
  color: var(--c-text-mute);
}

.impact-note {
  padding-top: 28px;
  border-top: 1px solid var(--c-line);
}

.impact-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.impact-item {
  background: var(--c-surface);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  padding: 14px 16px;
  min-width: 0;
}

.impact-field {
  font-size: 16px;
  margin-bottom: 6px;
}

.impact-desc {
  font-size: 14px;
  color: var(--c-text-soft);
}

/* ==========================================================================
   pages · 404
   ========================================================================== */

.error-main {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 48px 24px 72px;
}

.error-panel {
  max-width: 720px;
  background: var(--c-surface);
  border: 1px solid var(--c-line);
  border-top: 4px solid var(--c-accent);
  border-radius: var(--radius);
  padding: 32px;
}

.error-code {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--c-accent);
  margin-bottom: 10px;
}

.error-title {
  font-size: 32px;
  margin-bottom: 14px;
}

.error-text {
  color: var(--c-text-soft);
  margin-bottom: 10px;
}

.error-actions {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 22px 0;
}

.error-link {
  display: block;
  padding: 12px 14px;
  background: var(--c-bg);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  font-weight: 600;
  text-decoration: none;
  color: var(--c-text);
}

.error-link:hover {
  color: var(--c-accent);
  border-color: var(--c-accent);
  text-decoration: underline;
}

.error-note {
  font-size: 14px;
  color: var(--c-text-mute);
  padding-top: 14px;
  border-top: 1px solid var(--c-line-soft);
}

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

@media (max-width: 1024px) {
  .hero-table,
  .secondary-and-updates,
  .field-summary-cols,
  .reading-columns {
    grid-template-columns: minmax(0, 1fr);
    gap: 28px;
  }

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

  .sidebar,
  .page-aside {
    position: static;
  }

  .collection-card-row,
  .step-list,
  .index-columns,
  .site-index-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .footer-inner {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 28px;
  }
}

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

  .header-inner {
    flex-wrap: wrap;
    gap: 12px;
    padding: 0 16px;
    min-height: 58px;
  }

  .brand {
    font-size: 17px;
  }

  .nav-toggle {
    display: block;
  }

  .site-nav {
    flex: 1 0 100%;
  }

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 0;
    padding-bottom: 10px;
  }

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

  .nav-list li {
    border-top: 1px solid var(--c-line-soft);
  }

  .nav-link {
    display: flex;
    align-items: center;
    min-height: 48px;
    padding: 0 4px;
    border-bottom: 0;
    border-left: 3px solid transparent;
    font-size: 16px;
  }

  .nav-link.is-current {
    border-bottom-color: transparent;
    border-left-color: var(--c-accent);
    padding-left: 10px;
  }

  .home-main,
  .inner-main,
  .error-main {
    padding-left: 16px;
    padding-right: 16px;
  }

  .top-fact-bar {
    flex-direction: column;
    align-items: flex-start;
    margin: 16px 0 22px;
  }

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

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

  .collection-card-row,
  .step-list,
  .index-columns,
  .site-index-list,
  .bridge-list,
  .advice-list,
  .reading-columns,
  .related-list,
  .impact-list,
  .error-actions {
    grid-template-columns: minmax(0, 1fr);
  }

  .collection-groups .collection-card {
    flex-direction: column;
  }

  .collection-media {
    flex: 0 0 auto;
    width: 100%;
  }

  .channel-row {
    grid-template-columns: minmax(0, 1fr);
    gap: 14px;
  }

  .channel-meta {
    align-items: stretch;
  }

  .entry-item {
    grid-template-columns: auto 1fr;
  }

  .entry-field {
    grid-column: 2 / 3;
    justify-self: start;
  }

  .footer-inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 24px;
    padding: 32px 16px 22px;
  }

  .footer-copy {
    padding: 14px 16px 24px;
  }

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

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