/* ==========================================================================
   九九九影院 · 全站样式表
   结构：base → layout → components → pages → responsive
   ========================================================================== */

/* --------------------------------------------------------------------------
   base：变量、重置、排版、通用元素
   -------------------------------------------------------------------------- */
:root {
  --bg: #f4f3f0;
  --bg-raised: #fbfaf8;
  --ink: #1f1f1f;
  --ink-soft: #6b6b6b;
  --ink-faint: #8d8a85;
  --line: #dcd9d3;
  --line-strong: #c4c0b8;
  --accent: #7a4a2b;
  --accent-soft: #f0e7e0;
  --container: 1080px;
  --gutter: 32px;
  --radius: 6px;
  --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;
}

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

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.85;
  font-weight: 400;
  text-rendering: optimizeLegibility;
}

h1,
h2,
h3,
h4 {
  margin: 0;
  font-weight: 600;
  line-height: 1.35;
  color: var(--ink);
}

h1 {
  font-size: 36px;
  font-weight: 600;
}

h2 {
  font-size: 24px;
}

h3 {
  font-size: 19px;
}

p {
  margin: 0 0 1em;
}

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

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.18s ease, border-color 0.18s ease;
}

a:hover,
a:focus-visible {
  color: #5c351d;
}

a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

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

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

figure {
  margin: 0;
}

figcaption {
  margin-top: 10px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-soft);
}

dl,
dd {
  margin: 0;
}

dt {
  font-weight: 600;
}

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

time {
  font-style: normal;
}

button {
  font: inherit;
  color: inherit;
}

/* --------------------------------------------------------------------------
   layout：全站骨架（页头 / 导航 / 主容器 / 页脚）
   -------------------------------------------------------------------------- */
.site-body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  min-height: 100dvh;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.85;
}

/* 页头：品牌居中，两侧导航对称 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  background: rgba(244, 243, 240, 0.94);
  backdrop-filter: saturate(140%) blur(6px);
  border-bottom: 1px solid var(--line);
}

.site-nav {
  position: relative;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 16px;
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 18px var(--gutter);
}

.brand-mark {
  grid-column: 2;
  justify-self: center;
  font-size: 22px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--ink);
  white-space: nowrap;
}

.brand-mark.is-current {
  color: var(--ink);
}

.brand-mark:hover,
.brand-mark:focus-visible {
  color: var(--accent);
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 26px;
  font-size: 15px;
}

.nav-list-left {
  grid-column: 1;
  justify-content: flex-start;
}

.nav-list-right {
  grid-column: 3;
  justify-content: flex-end;
}

.nav-list a {
  display: inline-block;
  padding: 6px 0;
  color: var(--ink-soft);
  border-bottom: 1px solid transparent;
}

.nav-list a:hover,
.nav-list a:focus-visible {
  color: var(--ink);
  border-bottom-color: var(--line-strong);
}

.nav-list a.is-current {
  color: var(--ink);
  border-bottom-color: var(--accent);
}

.nav-toggle {
  display: none;
  grid-column: 3;
  justify-self: end;
  width: 44px;
  height: 44px;
  padding: 0;
  background: transparent;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  cursor: pointer;
}

.nav-toggle::before {
  content: "";
  display: block;
  width: 18px;
  height: 2px;
  margin: 0 auto;
  background: var(--ink);
  box-shadow: 0 -6px 0 var(--ink), 0 6px 0 var(--ink);
}

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

.nav-list-mobile {
  display: none;
}

/* 主内容容器 */
.site-main {
  flex: 1 0 auto;
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 56px var(--gutter) 72px;
}

.home-main {
  padding-top: 40px;
}

.inner-main {
  padding-top: 32px;
}

/* 内页面包屑与标题区，全站统一 */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 22px;
  font-size: 14px;
  color: var(--ink-soft);
}

.breadcrumb a {
  color: var(--ink-soft);
  border-bottom: 1px solid transparent;
}

.breadcrumb a:hover,
.breadcrumb a:focus-visible {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

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

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

.page-header {
  max-width: 760px;
  margin-bottom: 48px;
  padding-bottom: 26px;
  border-bottom: 1px solid var(--line);
}

.page-title {
  margin-bottom: 14px;
  font-size: 36px;
  font-weight: 600;
  line-height: 1.3;
}

.page-description {
  margin: 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink-soft);
}

/* 页脚 */
.site-footer {
  flex-shrink: 0;
  margin-top: 40px;
  padding: 52px var(--gutter) 32px;
  background: #ecebe7;
  border-top: 1px solid var(--line);
  color: var(--ink-soft);
  font-size: 15px;
}

.footer-inner {
  display: grid;
  grid-template-columns: minmax(240px, 1fr) minmax(0, 2fr);
  gap: 40px;
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
}

.footer-brand-name {
  margin: 0 0 10px;
  font-size: 19px;
  font-weight: 600;
  color: var(--ink);
}

.footer-brand-desc {
  margin: 0;
  max-width: 320px;
  line-height: 1.8;
}

.footer-columns {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 28px;
}

.footer-column h3 {
  margin: 0 0 12px;
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
}

.footer-column ul {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-column a {
  display: inline-block;
  padding: 3px 0;
  color: var(--ink-soft);
  border-bottom: 1px solid transparent;
}

.footer-column a:hover,
.footer-column a:focus-visible {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.footer-note,
.footer-copy {
  width: 100%;
  max-width: var(--container);
  margin: 34px auto 0;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  line-height: 1.8;
  color: var(--ink-faint);
}

.footer-copy {
  margin-top: 8px;
  padding-top: 0;
  border-top: 0;
}

/* --------------------------------------------------------------------------
   components：全站共用组件
   -------------------------------------------------------------------------- */

/* 小节标题组 */
.section-head {
  max-width: 720px;
  margin-bottom: 32px;
}

.section-head h2 {
  margin-bottom: 12px;
}

.section-note {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}

/* 内页小节统一样式 */
.section {
  margin-bottom: 64px;
}

.section > h2 {
  margin-bottom: 14px;
}

.section-intro {
  max-width: 740px;
  margin: 0 0 30px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.section-intro a {
  color: var(--accent);
  border-bottom: 1px solid var(--line-strong);
}

.section-intro a:hover,
.section-intro a:focus-visible {
  border-bottom-color: var(--accent);
}

.section-footnote {
  margin: 26px 0 0;
  font-size: 14px;
  color: var(--ink-soft);
}

.section-footnote a {
  border-bottom: 1px solid var(--line-strong);
}

.section-footnote a:hover,
.section-footnote a:focus-visible {
  border-bottom-color: var(--accent);
}

/* 通用配图 */
.section-media {
  margin: 36px 0 0;
}

.section-media img {
  width: 100%;
  height: 320px;
  object-fit: cover;
  border-radius: var(--radius);
  background: #e6e4df;
}

/* 通用定义型列表（更新线索变更类型等） */
.type-list {
  display: grid;
  grid-template-columns: minmax(120px, 180px) minmax(0, 1fr);
  gap: 0;
  border-top: 1px solid var(--line);
}

.type-list dt {
  padding: 16px 16px 16px 0;
  border-bottom: 1px solid var(--line);
  font-size: 16px;
  color: var(--ink);
}

.type-list dd {
  margin: 0;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}

/* 内页横向链接行 */
.link-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 28px;
  font-size: 15px;
}

.link-row a {
  display: inline-block;
  padding: 6px 0;
  color: var(--accent);
  border-bottom: 1px solid var(--line-strong);
}

.link-row a:hover,
.link-row a:focus-visible {
  border-bottom-color: var(--accent);
}

/* --------------------------------------------------------------------------
   pages：各页面业务模块
   -------------------------------------------------------------------------- */

/* ---------- 首页：首屏工具面 ---------- */
.hero-panel {
  margin-bottom: 72px;
}

.hero-eyebrow {
  margin: 0 0 16px;
  font-size: 14px;
  letter-spacing: 0.16em;
  color: var(--ink-faint);
  text-transform: uppercase;
}

.hero-title {
  max-width: 820px;
  margin: 0 0 20px;
  font-size: 40px;
  line-height: 1.28;
}

.hero-lead {
  max-width: 640px;
  margin: 0 0 34px;
  font-size: 17px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.hero-media {
  margin: 0 0 34px;
}

.hero-media img {
  width: 100%;
  height: 420px;
  object-fit: cover;
  border-radius: var(--radius);
  background: #e6e4df;
}

.hero-entries {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 12px;
}

.entry-link {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 52px;
  padding: 12px 10px;
  text-align: center;
  font-size: 15px;
  color: var(--ink);
  background: var(--bg-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.entry-link:hover,
.entry-link:focus-visible {
  color: var(--accent);
  border-color: var(--accent);
}

.entry-link-special {
  color: var(--accent);
  background: var(--accent-soft);
  border-color: #dcc9bb;
}

.entry-link-special:hover,
.entry-link-special:focus-visible {
  color: #5c351d;
  border-color: var(--accent);
}

/* ---------- 首页：频道分类全景 ---------- */
.channel-overview {
  margin-bottom: 72px;
}

.channel-rows {
  border-top: 1px solid var(--line);
}

.channel-row {
  display: grid;
  grid-template-columns: minmax(140px, 1fr) minmax(160px, 1.2fr) minmax(200px, 1.6fr) minmax(160px, 1.1fr);
  gap: 20px;
  align-items: baseline;
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
  transition: border-color 0.18s ease, background-color 0.18s ease;
}

.channel-row:hover {
  border-bottom-color: var(--line-strong);
  background: rgba(255, 255, 255, 0.5);
}

.channel-cell {
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink-soft);
}

.channel-name {
  font-size: 19px;
  font-weight: 600;
  color: var(--ink);
}

.channel-name a {
  color: var(--ink);
  border-bottom: 1px solid transparent;
}

.channel-name a:hover,
.channel-name a:focus-visible {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.channel-theme {
  color: var(--ink);
}

/* ---------- 首页：专题片单精选 ---------- */
.special-feature {
  margin-bottom: 72px;
}

.special-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 26px;
}

.special-card {
  display: flex;
  flex-direction: column;
  padding: 24px;
  background: var(--bg-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: border-color 0.18s ease, box-shadow 0.18s ease;
}

.special-card:hover {
  border-color: var(--line-strong);
  box-shadow: 0 6px 18px rgba(31, 31, 31, 0.06);
}

.special-card h3,
.special-card-name {
  margin: 0 0 12px;
  font-size: 19px;
}

.special-card h3 a,
.special-card-name a {
  color: var(--ink);
  border-bottom: 1px solid transparent;
}

.special-card h3 a:hover,
.special-card h3 a:focus-visible,
.special-card-name a:hover,
.special-card-name a:focus-visible {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.special-scope {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.special-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  margin: auto 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  color: var(--ink-faint);
}

/* ---------- 首页：更新线索速览 ---------- */
.update-brief {
  margin-bottom: 72px;
}

.update-months {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 30px;
}

.update-month {
  padding-top: 18px;
  border-top: 2px solid var(--ink);
}

.update-month-label {
  margin: 0 0 14px;
  font-size: 17px;
  color: var(--ink);
}

.update-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.update-item {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr) auto;
  gap: 12px;
  align-items: baseline;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
  font-size: 14px;
}

.update-date {
  color: var(--ink-faint);
  font-variant-numeric: tabular-nums;
}

.update-name {
  color: var(--ink);
}

.update-type {
  color: var(--accent);
  white-space: nowrap;
}

.section-more {
  margin: 26px 0 0;
  font-size: 15px;
}

.section-more a {
  border-bottom: 1px solid var(--line-strong);
}

.section-more a:hover,
.section-more a:focus-visible {
  border-bottom-color: var(--accent);
}

/* ---------- 首页：字段与收录边界摘要 ---------- */
.field-boundary {
  margin-bottom: 72px;
}

.field-boundary > h2 {
  margin-bottom: 30px;
}

.field-boundary-columns {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
  gap: 44px;
  align-items: start;
}

.field-column h3,
.boundary-column h3 {
  margin: 0 0 16px;
  font-size: 19px;
}

.field-table {
  font-size: 15px;
}

.field-table caption {
  padding-bottom: 12px;
  text-align: left;
  font-size: 13px;
  color: var(--ink-faint);
}

.field-table th,
.field-table td {
  padding: 13px 0;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.field-table th {
  width: 34%;
  padding-right: 16px;
  font-weight: 600;
  color: var(--ink);
}

.field-table td {
  color: var(--ink-soft);
  line-height: 1.75;
}

.boundary-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 20px;
}

.boundary-list li {
  position: relative;
  padding-left: 20px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.boundary-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  width: 8px;
  height: 1px;
  background: var(--accent);
}

.boundary-more {
  margin: 0;
  font-size: 15px;
}

.boundary-more a {
  border-bottom: 1px solid var(--line-strong);
}

.boundary-more a:hover,
.boundary-more a:focus-visible {
  border-bottom-color: var(--accent);
}

/* ---------- 首页：站内页面索引 ---------- */
.page-index {
  margin-bottom: 24px;
}

.page-index > h2 {
  margin-bottom: 30px;
}

.page-index-columns {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 28px;
}

.index-column {
  padding-top: 16px;
  border-top: 1px solid var(--line-strong);
}

.index-column h3 {
  margin: 0 0 12px;
  font-size: 17px;
}

.index-column h3 a {
  color: var(--ink);
  border-bottom: 1px solid transparent;
}

.index-column h3 a:hover,
.index-column h3 a:focus-visible {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.index-column p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
}

/* ---------- 频道分类页 ---------- */
.channels-table {
  margin-bottom: 64px;
}

.channels-table > h2 {
  margin-bottom: 14px;
}

.channels-table .section-note {
  max-width: 740px;
  margin-bottom: 32px;
}

.channels-table .channel-rows {
  border-top: 1px solid var(--line);
}

.channels-table .channel-row {
  display: grid;
  grid-template-columns: minmax(220px, 300px) minmax(0, 1fr);
  gap: 32px;
  align-items: start;
  padding: 30px 0;
  border-bottom: 1px solid var(--line);
  transition: border-color 0.18s ease;
}

.channels-table .channel-row:hover {
  border-bottom-color: var(--line-strong);
}

.channel-media img {
  width: 100%;
  height: 180px;
  object-fit: cover;
  border-radius: var(--radius);
  background: #e6e4df;
}

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

.channel-body .channel-name {
  margin: 0 0 14px;
  font-size: 21px;
  font-weight: 600;
  color: var(--ink);
}

.channel-fields {
  display: grid;
  grid-template-columns: minmax(96px, 130px) minmax(0, 1fr);
  gap: 0;
}

.channel-fields dt {
  padding: 10px 14px 10px 0;
  border-bottom: 1px solid var(--line);
  font-size: 14px;
  color: var(--ink);
}

.channel-fields dd {
  margin: 0;
  padding: 10px 0;
  border-bottom: 1px solid var(--line);
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink-soft);
}

.channel-vs-special {
  margin-bottom: 64px;
}

.channel-vs-special > h2 {
  margin-bottom: 26px;
}

.compare-columns {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 40px;
}

.compare-col {
  padding-top: 18px;
  border-top: 2px solid var(--ink);
}

.compare-col h3 {
  margin: 0 0 14px;
  font-size: 19px;
}

.compare-col p {
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.channel-advice {
  margin-bottom: 24px;
}

.channel-advice > h2 {
  margin-bottom: 14px;
}

.channel-advice .section-note {
  max-width: 740px;
  margin-bottom: 30px;
}

.advice-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 28px;
  counter-reset: advice;
}

.advice-item {
  padding-top: 16px;
  border-top: 1px solid var(--line-strong);
}

.advice-item h3 {
  margin: 0 0 10px;
  font-size: 17px;
}

.advice-item h3::before {
  counter-increment: advice;
  content: counter(advice, decimal-leading-zero) " ";
  color: var(--accent);
  font-variant-numeric: tabular-nums;
}

.advice-item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}

/* ---------- 专题片单页 ---------- */
.section-special-list .special-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 28px;
}

.section-special-list .special-card {
  padding: 0 0 22px;
  background: transparent;
  border: 0;
  border-bottom: 1px solid var(--line);
  border-radius: 0;
}

.section-special-list .special-card:hover {
  border-bottom-color: var(--line-strong);
  box-shadow: none;
}

.special-card-media {
  margin: 0 0 18px;
}

.special-card-media img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  border-radius: var(--radius);
  background: #e6e4df;
}

.special-card-fields {
  display: grid;
  grid-template-columns: minmax(88px, 116px) minmax(0, 1fr);
  margin-top: 4px;
}

.special-card-fields dt {
  padding: 8px 12px 8px 0;
  border-bottom: 1px solid var(--line);
  font-size: 13px;
  color: var(--ink);
}

.special-card-fields dd {
  margin: 0;
  padding: 8px 0;
  border-bottom: 1px solid var(--line);
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-soft);
}

.section-special-idea > h2 {
  margin-bottom: 26px;
}

.idea-columns {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 40px;
}

.idea-column {
  padding-top: 18px;
  border-top: 2px solid var(--ink);
}

.idea-column h3 {
  margin: 0 0 14px;
  font-size: 19px;
}

.idea-column p {
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.section-special-compare .compare-rows {
  border-top: 1px solid var(--line);
}

.compare-row {
  display: grid;
  grid-template-columns: minmax(180px, 260px) minmax(0, 1fr);
  gap: 28px;
  align-items: baseline;
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
}

.compare-row h3 {
  margin: 0;
  font-size: 17px;
}

.compare-row p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.section-special-more {
  margin-bottom: 24px;
}

.section-special-more > h2 {
  margin-bottom: 20px;
}

/* ---------- 更新线索页 ---------- */
.updates-timeline > h2 {
  margin-bottom: 14px;
}

.timeline-group {
  margin-bottom: 44px;
  padding-left: 22px;
  border-left: 2px solid var(--line-strong);
}

.timeline-month {
  position: relative;
  margin: 0 0 18px;
  font-size: 19px;
}

.timeline-month::before {
  content: "";
  position: absolute;
  left: -29px;
  top: 12px;
  width: 10px;
  height: 10px;
  background: var(--accent);
  border-radius: 50%;
}

.timeline-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.timeline-item {
  display: grid;
  grid-template-columns: 108px minmax(0, 1fr) auto;
  gap: 20px;
  align-items: baseline;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
  font-size: 15px;
}

.record-date {
  color: var(--ink-faint);
  font-variant-numeric: tabular-nums;
}

.record-name {
  color: var(--ink);
}

.record-type {
  color: var(--accent);
  white-space: nowrap;
}

.updates-rhythm > h2 {
  margin-bottom: 26px;
}

.updates-rhythm .section-media {
  margin: 0 0 30px;
}

.updates-rhythm .section-media img {
  height: 280px;
}

.rhythm-body {
  max-width: 760px;
}

.rhythm-body p {
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.updates-types > h2 {
  margin-bottom: 14px;
}

.updates-types .section-intro {
  margin-bottom: 26px;
}

.updates-types .type-list {
  margin-bottom: 4px;
}

/* ---------- 浏览指引页 ---------- */
.page-figure {
  margin: 0 0 52px;
}

.page-figure img {
  width: 100%;
  height: 320px;
  object-fit: cover;
  border-radius: var(--radius);
  background: #e6e4df;
}

.guide-fields > h2,
.guide-scope > h2,
.guide-prepare > h2,
.guide-faq > h2 {
  margin-bottom: 14px;
}

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

.field-row {
  display: grid;
  grid-template-columns: minmax(140px, 220px) minmax(0, 1fr);
  gap: 24px;
  align-items: baseline;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}

.field-row dt {
  font-size: 16px;
  color: var(--ink);
}

.field-row dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.scope-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 28px;
}

.scope-item {
  padding-top: 16px;
  border-top: 1px solid var(--line-strong);
}

.scope-item h3 {
  margin: 0 0 10px;
  font-size: 17px;
}

.scope-item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.prepare-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 28px;
  counter-reset: prepare;
}

.prepare-item {
  padding-top: 16px;
  border-top: 1px solid var(--line-strong);
}

.prepare-item h3 {
  margin: 0 0 10px;
  font-size: 17px;
}

.prepare-item h3::before {
  counter-increment: prepare;
  content: counter(prepare, decimal-leading-zero) " ";
  color: var(--accent);
  font-variant-numeric: tabular-nums;
}

.prepare-item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}

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

.faq-item {
  border-bottom: 1px solid var(--line);
}

.faq-item summary {
  position: relative;
  padding: 18px 40px 18px 0;
  font-size: 17px;
  font-weight: 600;
  color: var(--ink);
  cursor: pointer;
  list-style: none;
}

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

.faq-item summary::after {
  content: "";
  position: absolute;
  right: 6px;
  top: 26px;
  width: 10px;
  height: 10px;
  border-right: 1.5px solid var(--accent);
  border-bottom: 1.5px solid var(--accent);
  transform: rotate(45deg);
  transition: transform 0.2s ease;
}

.faq-item[open] summary::after {
  transform: rotate(-135deg);
}

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

.faq-item p {
  margin: 0;
  padding: 0 40px 20px 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-soft);
}

/* ---------- 404 ---------- */
.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  padding-top: 72px;
  padding-bottom: 72px;
}

.error-panel {
  width: 100%;
  max-width: 640px;
  padding: 44px 0 0;
  border-top: 2px solid var(--ink);
}

.error-code {
  margin: 0 0 14px;
  font-size: 14px;
  letter-spacing: 0.16em;
  color: var(--ink-faint);
}

.error-title {
  margin: 0 0 16px;
  font-size: 32px;
  line-height: 1.3;
}

.error-desc {
  margin: 0 0 30px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.error-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.error-link-primary {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 10px 18px;
  font-size: 15px;
  color: var(--ink);
  background: var(--bg-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.error-link-primary:hover,
.error-link-primary:focus-visible {
  color: var(--accent);
  border-color: var(--accent);
}

/* --------------------------------------------------------------------------
   responsive：断点 960px / 640px
   -------------------------------------------------------------------------- */
@media (max-width: 960px) {
  :root {
    --gutter: 24px;
  }

  .site-main {
    padding-top: 40px;
    padding-bottom: 56px;
  }

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

  .hero-media img {
    height: 320px;
  }

  .hero-entries {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .channel-row {
    grid-template-columns: minmax(120px, 1fr) minmax(140px, 1fr);
    gap: 10px 20px;
  }

  .channel-org,
  .channel-pick {
    grid-column: 1 / -1;
  }

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

  .field-boundary-columns {
    grid-template-columns: minmax(0, 1fr);
    gap: 40px;
  }

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

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

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

  .channels-table .channel-row {
    grid-template-columns: minmax(0, 1fr);
    gap: 20px;
  }

  .channel-media img {
    height: 220px;
  }

  .advice-list,
  .scope-list,
  .prepare-list {
    grid-template-columns: minmax(0, 1fr);
    gap: 22px;
  }

  .compare-columns,
  .idea-columns {
    grid-template-columns: minmax(0, 1fr);
    gap: 28px;
  }
}

@media (max-width: 640px) {
  body,
  .site-body {
    font-size: 16px;
  }

  .site-nav {
    grid-template-columns: 1fr auto;
    grid-template-areas:
      "brand toggle"
      "menu menu";
    gap: 12px;
    padding: 14px var(--gutter);
  }

  .brand-mark {
    grid-area: brand;
    justify-self: start;
    font-size: 19px;
  }

  .nav-toggle {
    display: block;
    grid-area: toggle;
  }

  .nav-list-left,
  .nav-list-right {
    display: none;
  }

  .nav-list-mobile {
    grid-area: menu;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    width: 100%;
    padding-top: 6px;
    border-top: 1px solid var(--line);
  }

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

  .nav-list-mobile li {
    border-bottom: 1px solid var(--line);
  }

  .nav-list-mobile a {
    display: flex;
    align-items: center;
    min-height: 48px;
    padding: 10px 2px;
    font-size: 16px;
    color: var(--ink);
    border-bottom: 0;
  }

  .nav-list-mobile a.is-current {
    color: var(--accent);
  }

  .site-main,
  .home-main,
  .inner-main {
    padding-top: 28px;
    padding-bottom: 48px;
  }

  h1,
  .page-title,
  .hero-title {
    font-size: 26px;
  }

  h2 {
    font-size: 21px;
  }

  h3 {
    font-size: 17px;
  }

  .page-header {
    margin-bottom: 34px;
    padding-bottom: 20px;
  }

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

  .hero-panel {
    margin-bottom: 52px;
  }

  .hero-eyebrow {
    font-size: 13px;
    letter-spacing: 0.12em;
  }

  .hero-lead {
    font-size: 16px;
  }

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

  .hero-entries {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px;
  }

  .entry-link {
    min-height: 48px;
    font-size: 14px;
  }

  .channel-overview,
  .special-feature,
  .update-brief,
  .field-boundary {
    margin-bottom: 52px;
  }

  .channel-row {
    grid-template-columns: minmax(0, 1fr);
    gap: 6px;
    padding: 18px 0;
  }

  .channel-org,
  .channel-pick {
    grid-column: auto;
  }

  .special-grid,
  .section-special-list .special-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 22px;
  }

  .update-months {
    grid-template-columns: minmax(0, 1fr);
    gap: 26px;
  }

  .update-item {
    grid-template-columns: 48px minmax(0, 1fr) auto;
    gap: 10px;
  }

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

  .section {
    margin-bottom: 48px;
  }

  .section-media img,
  .page-figure img,
  .updates-rhythm .section-media img {
    height: 200px;
  }

  .page-figure {
    margin-bottom: 38px;
  }

  .channel-media img,
  .special-card-media img {
    height: 180px;
  }

  .channel-fields,
  .special-card-fields,
  .type-list {
    grid-template-columns: minmax(0, 1fr);
  }

  .channel-fields dt,
  .special-card-fields dt,
  .type-list dt {
    padding-bottom: 2px;
    border-bottom: 0;
  }

  .channel-fields dd,
  .special-card-fields dd,
  .type-list dd {
    padding-top: 0;
  }

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

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

  .timeline-group {
    padding-left: 16px;
  }

  .timeline-month::before {
    left: -23px;
  }

  .timeline-item {
    grid-template-columns: 92px minmax(0, 1fr);
    gap: 6px 14px;
  }

  .record-type {
    grid-column: 2;
  }

  .faq-item summary {
    padding-right: 32px;
    font-size: 16px;
  }

  .faq-item p {
    padding-right: 0;
  }

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

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

  .error-actions {
    flex-direction: column;
  }

  .error-link-primary {
    justify-content: center;
  }

  .site-footer {
    padding: 40px var(--gutter) 26px;
  }

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

/* 动效增强：仅在支持动画时轻微淡入，不影响初始可见性 */
@media (prefers-reduced-motion: no-preference) {
  .page-header,
  .hero-panel,
  .section,
  .channel-overview,
  .special-feature,
  .update-brief,
  .field-boundary,
  .page-index {
    animation: rise 0.5s ease-out both;
  }

  @keyframes rise {
    from {
      opacity: 0.001;
      transform: translateY(8px);
    }
    to {
      opacity: 1;
      transform: none;
    }
  }
}