/* =========================================================
   九九影院全部电视剧 · 站点样式
   分组：base / layout / components / pages / responsive
   ========================================================= */

/* ---------------------------------------------------------
   base：变量、重置、排版基调
   --------------------------------------------------------- */
:root {
  --c-primary: #14555a;
  --c-primary-dark: #0e3f43;
  --c-accent: #c9a227;
  --c-accent-soft: #f0e6c8;
  --c-bg: #f7f6f2;
  --c-surface: #ffffff;
  --c-text: #22282b;
  --c-text-soft: #5b6668;
  --c-line: #dcd8cf;
  --c-line-strong: #c3bcae;
  --radius: 6px;
  --radius-sm: 4px;
  --shadow-card: 0 1px 2px rgba(20, 85, 90, 0.06), 0 6px 18px rgba(20, 85, 90, 0.05);
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, "Courier New", monospace;
  --wrap: 1120px;
  --gutter: 24px;
}

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

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

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

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

p {
  margin: 0;
}

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

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

a:hover,
a:focus-visible {
  color: var(--c-primary-dark);
  text-decoration: underline;
}

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

figure {
  margin: 0;
}

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

button {
  font: inherit;
  color: inherit;
}

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

/* ---------------------------------------------------------
   layout：全站骨架（页头 / 导航 / 主容器 / 页脚）
   --------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 24px;
  min-height: 68px;
  padding: 12px var(--gutter);
  background: var(--c-surface);
  border-bottom: 1px solid var(--c-line);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--c-primary);
}

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

.brand-mark {
  display: inline-block;
  padding: 2px 9px;
  border-radius: var(--radius-sm);
  background: var(--c-primary);
  color: #fff;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.02em;
}

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

.site-nav {
  margin-left: auto;
}

.nav-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px 6px;
}

.nav-link {
  display: inline-block;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  font-size: 15px;
  color: var(--c-text);
  white-space: nowrap;
}

.nav-link:hover,
.nav-link:focus-visible {
  background: #eef3f2;
  color: var(--c-primary);
  text-decoration: none;
}

.nav-link.is-current {
  color: var(--c-primary);
  font-weight: 700;
  background: #eef3f2;
  box-shadow: inset 0 -2px 0 var(--c-accent);
}

.nav-toggle {
  display: none;
  margin-left: auto;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 1px solid var(--c-line);
  border-radius: var(--radius-sm);
  background: var(--c-surface);
  cursor: pointer;
}

.nav-toggle::before {
  content: "";
  display: block;
  width: 20px;
  height: 2px;
  margin: 7px auto 0;
  background: var(--c-primary);
  box-shadow: 0 6px 0 var(--c-primary), 0 12px 0 var(--c-primary);
}

.site-main {
  display: block;
  width: 100%;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 28px var(--gutter) 56px;
}

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

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

.breadcrumb a {
  color: var(--c-text-soft);
}

.breadcrumb a:hover,
.breadcrumb a:focus-visible {
  color: var(--c-primary);
}

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

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

.page-header {
  padding: 0 0 22px;
  margin-bottom: 26px;
  border-bottom: 1px solid var(--c-line);
}

.page-title {
  font-size: 30px;
  margin-bottom: 12px;
}

.page-description {
  color: var(--c-text-soft);
  max-width: 880px;
}

.page-lead {
  margin-top: 10px;
  color: var(--c-text-soft);
  max-width: 880px;
}

.site-footer {
  margin-top: 40px;
  padding: 36px var(--gutter) 24px;
  background: var(--c-primary);
  color: #dce9e8;
  font-size: 14px;
}

.footer-brand {
  max-width: var(--wrap);
  margin: 0 auto 22px;
  padding-bottom: 18px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.16);
}

.footer-name {
  font-size: 17px;
  font-weight: 700;
  color: #fff;
}

.footer-desc {
  margin-top: 6px;
  max-width: 720px;
  color: #b9d2d1;
}

.footer-nav {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 22px 24px;
  max-width: var(--wrap);
  margin: 0 auto 22px;
}

.footer-title {
  font-size: 15px;
  color: #fff;
  margin-bottom: 10px;
}

.footer-list {
  display: grid;
  gap: 6px;
}

.footer-list a {
  color: #c4dbda;
}

.footer-list a:hover,
.footer-list a:focus-visible {
  color: #fff;
}

.footer-boundary {
  max-width: var(--wrap);
  margin: 0 auto;
  padding-top: 16px;
  border-top: 1px solid rgba(255, 255, 255, 0.16);
  color: #b9d2d1;
}

.footer-copy {
  max-width: var(--wrap);
  margin: 8px auto 0;
  color: #9dc0bf;
  font-size: 13px;
}

/* ---------------------------------------------------------
   components：通用模块（区块头、表格、卡片、提示条、按钮）
   --------------------------------------------------------- */
.section-head {
  margin-bottom: 18px;
}

.section-title {
  font-size: 20px;
  margin-bottom: 8px;
}

.section-desc,
.section-note,
.section-intro {
  color: var(--c-text-soft);
  max-width: 900px;
}

.section-foot,
.section-tail {
  margin-top: 16px;
  font-size: 15px;
}

.section-foot a,
.section-tail a {
  margin-right: 14px;
}

.section-figure {
  margin-top: 20px;
}

.section-figure img {
  width: 100%;
  max-height: 340px;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--c-line);
}

.section-figure figcaption {
  margin-top: 8px;
  font-size: 13px;
  color: var(--c-text-soft);
}

.table-wrap {
  width: 100%;
  overflow-x: auto;
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  background: var(--c-surface);
}

.data-table {
  min-width: 640px;
  font-size: 14px;
}

.table-caption {
  padding: 10px 14px;
  text-align: left;
  font-size: 13px;
  color: var(--c-text-soft);
  background: #f2f0ea;
  border-bottom: 1px solid var(--c-line);
}

.data-table th,
.data-table td {
  padding: 11px 14px;
  border-bottom: 1px solid var(--c-line);
  text-align: left;
  vertical-align: top;
}

.data-table thead th {
  background: #eef3f2;
  color: var(--c-primary);
  font-weight: 700;
  white-space: nowrap;
}

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

.data-table tbody tr:hover {
  background: #faf9f5;
}

.data-table .num {
  font-family: var(--font-mono);
  color: var(--c-accent);
  font-weight: 700;
  white-space: nowrap;
}

.data-table .cell-code {
  font-family: var(--font-mono);
  color: var(--c-accent);
  font-weight: 700;
  white-space: nowrap;
}

.data-table .cell-key {
  font-weight: 700;
  color: var(--c-primary);
  white-space: nowrap;
}

.data-table .cell-name {
  font-weight: 700;
  color: var(--c-text);
}

.tip-bar {
  margin-top: 16px;
  padding: 14px 16px;
  border-left: 4px solid var(--c-accent);
  border-radius: var(--radius-sm);
  background: var(--c-accent-soft);
}

.tip-toggle {
  padding: 0;
  border: 0;
  background: none;
  font-weight: 700;
  color: var(--c-primary);
  cursor: pointer;
}

.tip-toggle::after {
  content: " ▾";
  font-size: 12px;
}

.tip-toggle[aria-expanded="true"]::after {
  content: " ▴";
}

.tip-text {
  margin-top: 8px;
  font-size: 14px;
  color: var(--c-text);
}

.tip-toggle[aria-expanded="false"] + .tip-text {
  display: none;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  font-weight: 700;
  text-decoration: none;
}

.btn:hover,
.btn:focus-visible {
  text-decoration: none;
}

.btn-primary {
  background: var(--c-primary);
  color: #fff;
}

.btn-primary:hover,
.btn-primary:focus-visible {
  background: var(--c-primary-dark);
  color: #fff;
}

.btn-ghost {
  border-color: var(--c-line-strong);
  color: var(--c-primary);
  background: var(--c-surface);
}

.btn-ghost:hover,
.btn-ghost:focus-visible {
  border-color: var(--c-primary);
  color: var(--c-primary-dark);
}

/* ---------------------------------------------------------
   pages：首页
   --------------------------------------------------------- */
.topbar {
  padding: 9px var(--gutter);
  background: var(--c-primary);
  color: #dce9e8;
  font-size: 13px;
}

.topbar-text {
  max-width: var(--wrap);
  margin: 0 auto;
}

.home-main {
  padding-top: 26px;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  gap: 32px;
  align-items: start;
  padding-bottom: 34px;
  margin-bottom: 34px;
  border-bottom: 1px solid var(--c-line);
}

.hero-kicker {
  display: inline-block;
  padding: 3px 10px;
  margin-bottom: 12px;
  border-radius: var(--radius-sm);
  background: var(--c-accent-soft);
  color: #7a5f0e;
  font-size: 13px;
  font-weight: 700;
}

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

.hero-lead {
  color: var(--c-text-soft);
}

.hero-note {
  margin-top: 10px;
  padding-left: 12px;
  border-left: 3px solid var(--c-line-strong);
  font-size: 14px;
  color: var(--c-text-soft);
}

.hero-entries {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-top: 20px;
}

.entry-btn {
  display: flex;
  align-items: center;
  min-height: 46px;
  padding: 10px 16px;
  border: 1px solid var(--c-line);
  border-radius: var(--radius-sm);
  background: var(--c-surface);
  color: var(--c-primary);
  font-weight: 700;
  box-shadow: var(--shadow-card);
}

.entry-btn:hover,
.entry-btn:focus-visible {
  border-color: var(--c-primary);
  background: #eef3f2;
  text-decoration: none;
}

.hero-figure img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--c-line);
}

.hero-figure figcaption {
  margin-top: 8px;
  font-size: 13px;
  color: var(--c-text-soft);
}

.channel-table-section,
.special-cards-section,
.record-list-section,
.field-boundary-section,
.site-index-section {
  margin-bottom: 40px;
}

.special-cards {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}

.special-card {
  display: flex;
  flex-direction: column;
  padding: 14px;
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  background: var(--c-surface);
  box-shadow: var(--shadow-card);
}

.special-figure {
  margin-bottom: 12px;
}

.special-figure img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: var(--radius-sm);
}

.special-name {
  font-size: 17px;
  margin-bottom: 6px;
}

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

.special-count {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: #7a5f0e;
}

.special-channel {
  margin-top: 8px;
  font-size: 14px;
}

.special-link {
  margin-top: auto;
  padding-top: 12px;
  font-size: 14px;
  font-weight: 700;
}

.special-link::after {
  content: " →";
}

.record-groups {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

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

.record-month {
  font-size: 16px;
  padding-bottom: 8px;
  margin-bottom: 10px;
  border-bottom: 2px solid var(--c-accent);
}

.record-items {
  display: grid;
  gap: 12px;
}

.record-item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 4px 10px;
  padding-bottom: 12px;
  border-bottom: 1px dashed var(--c-line);
}

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

.record-date {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--c-accent);
  font-weight: 700;
}

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

.record-type {
  grid-column: 1 / -1;
  justify-self: start;
  padding: 1px 8px;
  border-radius: var(--radius-sm);
  background: #eef3f2;
  color: var(--c-primary);
  font-size: 12px;
}

.record-text {
  grid-column: 1 / -1;
  font-size: 14px;
  color: var(--c-text);
}

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

.field-column,
.boundary-column {
  padding: 18px;
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  background: var(--c-surface);
}

.column-title {
  font-size: 17px;
  margin-bottom: 12px;
}

.field-table {
  min-width: 0;
}

.column-foot {
  margin-top: 12px;
  font-size: 14px;
}

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

.boundary-item {
  padding-left: 14px;
  border-left: 3px solid var(--c-accent);
  font-size: 14px;
}

.site-index {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}

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

.index-title {
  font-size: 16px;
  margin-bottom: 10px;
}

.index-list {
  display: grid;
  gap: 8px;
  font-size: 14px;
}

/* ---------------------------------------------------------
   pages：题材频道
   --------------------------------------------------------- */
.channel-table-section,
.overlap-section,
.channel-special-map {
  margin-bottom: 36px;
}

.overlap-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.overlap-item {
  padding: 16px;
  border: 1px solid var(--c-line);
  border-left: 4px solid var(--c-primary);
  border-radius: var(--radius);
  background: var(--c-surface);
}

.overlap-title {
  font-size: 16px;
  margin-bottom: 8px;
}

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

.map-table {
  min-width: 560px;
}

/* ---------------------------------------------------------
   pages：专题片单
   --------------------------------------------------------- */
.section {
  margin-bottom: 36px;
}

.special-grid-section .section-title,
.order-logic-section .section-title,
.special-channel-section .section-title {
  margin-bottom: 8px;
}

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

.special-grid .special-card {
  padding: 16px;
}

.special-grid .special-figure img {
  aspect-ratio: 16 / 9;
}

.order-logic-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  margin-top: 18px;
}

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

.logic-title {
  font-size: 16px;
  margin-bottom: 8px;
}

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

.special-channel-body {
  margin-top: 14px;
  display: grid;
  gap: 10px;
  max-width: 900px;
}

.special-channel-text {
  color: var(--c-text-soft);
}

/* ---------------------------------------------------------
   pages：整理记录
   --------------------------------------------------------- */
.record-section,
.change-type-section,
.record-field-section,
.next-step-section {
  margin-bottom: 36px;
}

.month-block {
  padding: 18px;
  margin-top: 18px;
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  background: var(--c-surface);
}

.month-title {
  font-size: 18px;
  padding-bottom: 8px;
  margin-bottom: 14px;
  border-bottom: 2px solid var(--c-accent);
}

.record-media {
  margin-bottom: 14px;
}

.record-media img {
  width: 100%;
  max-height: 260px;
  object-fit: cover;
  border-radius: var(--radius-sm);
}

.record-media figcaption {
  margin-top: 6px;
  font-size: 13px;
  color: var(--c-text-soft);
}

.record-list {
  display: grid;
  gap: 14px;
}

.record-list .record-item {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, max-content)) 1fr;
  gap: 4px 16px;
  align-items: baseline;
  padding-bottom: 14px;
  border-bottom: 1px dashed var(--c-line);
}

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

.record-list .record-date {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--c-accent);
}

.record-list .record-channel {
  font-size: 13px;
  color: var(--c-text-soft);
}

.record-list .record-type {
  font-size: 13px;
  color: var(--c-primary);
  font-weight: 700;
}

.record-desc {
  grid-column: 1 / -1;
  font-size: 14px;
}

.change-type-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  margin-top: 18px;
}

.change-type-card {
  padding: 16px;
  border: 1px solid var(--c-line);
  border-top: 4px solid var(--c-primary);
  border-radius: var(--radius);
  background: var(--c-surface);
}

.change-type-name {
  font-size: 16px;
  margin-bottom: 8px;
}

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

.change-type-scope {
  margin-top: 8px;
  font-size: 13px;
  color: #7a5f0e;
}

.record-field-table {
  margin-top: 16px;
  font-size: 14px;
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  background: var(--c-surface);
  overflow: hidden;
}

.record-field-table th,
.record-field-table td {
  padding: 11px 14px;
  border-bottom: 1px solid var(--c-line);
  text-align: left;
  vertical-align: top;
}

.record-field-table thead th {
  background: #eef3f2;
  color: var(--c-primary);
}

.record-field-table tbody th {
  background: #faf9f5;
  color: var(--c-primary);
  white-space: nowrap;
}

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

.next-step-text {
  color: var(--c-text-soft);
}

/* ---------------------------------------------------------
   pages：观看指引 / 字段说明（左侧目录 + 右侧正文）
   --------------------------------------------------------- */
.page-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
  align-items: start;
}

.sidebar-left .page-layout,
.page-layout.sidebar-left {
  grid-template-columns: 240px minmax(0, 1fr);
}

.side-toc {
  position: sticky;
  top: 88px;
  padding: 16px;
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  background: var(--c-surface);
}

.side-toc-title,
.toc-title {
  font-size: 15px;
  color: var(--c-primary);
  margin-bottom: 10px;
}

.side-toc-list,
.toc-list {
  display: grid;
  gap: 6px;
  counter-reset: toc;
}

.side-toc-list li,
.toc-list li {
  counter-increment: toc;
}

.side-toc-list a,
.toc-link {
  display: flex;
  gap: 8px;
  align-items: baseline;
  padding: 6px 8px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  color: var(--c-text-soft);
}

.side-toc-list a::before,
.toc-link::before {
  content: counter(toc, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--c-accent);
}

.side-toc-list a:hover,
.side-toc-list a:focus-visible,
.toc-link:hover,
.toc-link:focus-visible {
  background: #eef3f2;
  color: var(--c-primary);
  text-decoration: none;
}

.guide-content,
.layout-content {
  display: grid;
  gap: 28px;
  min-width: 0;
}

.guide-section,
.content-section {
  padding-bottom: 26px;
  border-bottom: 1px solid var(--c-line);
}

.guide-section:last-child,
.content-section:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.guide-section .section-title,
.content-section .section-title {
  margin-bottom: 8px;
}

.guide-figure {
  margin: 16px 0;
}

.guide-figure img {
  width: 100%;
  max-height: 300px;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--c-line);
}

.guide-figure figcaption {
  margin-top: 8px;
  font-size: 13px;
  color: var(--c-text-soft);
}

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

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

.guide-item-title,
.guide-step-title,
.guide-check-title {
  font-size: 15px;
  margin-bottom: 6px;
}

.guide-item p,
.guide-step p,
.guide-check-item p {
  font-size: 14px;
  color: var(--c-text-soft);
}

.guide-steps {
  display: grid;
  gap: 14px;
  margin-top: 16px;
  counter-reset: step;
}

.guide-step {
  position: relative;
  padding: 14px 16px 14px 56px;
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  background: var(--c-surface);
  counter-increment: step;
}

.guide-step::before {
  content: counter(step);
  position: absolute;
  top: 14px;
  left: 16px;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--c-primary);
  color: #fff;
  font-family: var(--font-mono);
  font-size: 13px;
}

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

.guide-check-item {
  padding: 14px 16px;
  border: 1px solid var(--c-line);
  border-left: 4px solid var(--c-accent);
  border-radius: var(--radius);
  background: var(--c-surface);
}

.boundary-box {
  margin-top: 16px;
  padding: 18px;
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  background: var(--c-surface);
}

.boundary-box > p {
  color: var(--c-text-soft);
}

.boundary-box .boundary-list {
  margin-top: 12px;
}

.section-next {
  margin-top: 16px;
  font-size: 15px;
}

.section-next a {
  margin-right: 14px;
}

.faq-section {
  margin-top: 12px;
}

.faq-list {
  display: grid;
  gap: 10px;
  margin-top: 16px;
}

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

.faq-question {
  padding: 14px 16px;
  font-weight: 700;
  color: var(--c-primary);
  cursor: pointer;
  list-style: none;
}

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

.faq-question::after {
  content: "＋";
  float: right;
  color: var(--c-accent);
}

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

.faq-answer {
  padding: 0 16px 14px;
  font-size: 14px;
  color: var(--c-text-soft);
}

.page-figure {
  margin-bottom: 4px;
}

.page-figure img {
  width: 100%;
  max-height: 300px;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--c-line);
}

.figure-caption {
  margin-top: 8px;
  font-size: 13px;
  color: var(--c-text-soft);
}

.rule-list {
  display: grid;
  gap: 14px;
  margin-top: 16px;
}

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

.rule-title {
  font-size: 15px;
  margin-bottom: 6px;
}

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

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

.boundary-card {
  padding: 16px;
  border: 1px solid var(--c-line);
  border-top: 4px solid var(--c-primary);
  border-radius: var(--radius);
  background: var(--c-surface);
}

.boundary-title {
  font-size: 15px;
  margin-bottom: 6px;
}

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

.boundary-next,
.feedback-next {
  margin-top: 16px;
  font-size: 15px;
}

.boundary-next a,
.feedback-next a {
  margin-right: 14px;
}

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

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

.feedback-title {
  font-size: 15px;
  margin-bottom: 6px;
}

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

/* ---------------------------------------------------------
   pages：404
   --------------------------------------------------------- */
.error-main {
  padding-top: 40px;
}

.error-panel {
  max-width: 720px;
  padding: 32px;
  margin-bottom: 32px;
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  background: var(--c-surface);
  box-shadow: var(--shadow-card);
}

.error-code {
  font-family: var(--font-mono);
  font-size: 40px;
  font-weight: 700;
  color: var(--c-accent);
  line-height: 1;
}

.error-panel h1 {
  font-size: 28px;
  margin: 12px 0;
}

.error-desc {
  color: var(--c-text-soft);
}

.error-hint {
  margin-top: 8px;
  font-size: 14px;
  color: var(--c-text-soft);
}

.error-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

.error-routes {
  max-width: 720px;
  padding: 24px;
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  background: var(--c-surface);
}

.error-routes h2 {
  font-size: 18px;
  margin-bottom: 14px;
}

.error-route-list {
  display: grid;
  gap: 10px;
}

.error-route-list li {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 12px;
  align-items: baseline;
  padding-bottom: 10px;
  border-bottom: 1px dashed var(--c-line);
}

.error-route-list li:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.error-route-list span {
  font-size: 14px;
  color: var(--c-text-soft);
}

/* ---------------------------------------------------------
   responsive：断点 1024 / 768 / 480
   --------------------------------------------------------- */
@media (max-width: 1024px) {
  .hero {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 24px;
  }

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

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

@media (max-width: 768px) {
  :root {
    --gutter: 20px;
  }

  .site-header {
    min-height: 60px;
    padding: 10px var(--gutter);
  }

  .nav-toggle {
    display: block;
  }

  .site-nav {
    width: 100%;
    margin-left: 0;
  }

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    padding-top: 8px;
  }

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

  .nav-link {
    display: block;
    padding: 12px 10px;
    min-height: 44px;
  }

  .site-main {
    padding: 20px var(--gutter) 40px;
  }

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

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

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

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

  .record-groups,
  .overlap-list,
  .order-logic-grid,
  .change-type-grid {
    grid-template-columns: minmax(0, 1fr);
  }

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

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

  .guide-list,
  .guide-check,
  .boundary-grid,
  .feedback-block {
    grid-template-columns: minmax(0, 1fr);
  }

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

  .side-toc {
    position: static;
    top: auto;
    order: 2;
  }

  .guide-content,
  .layout-content {
    order: 1;
  }

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

@media (max-width: 480px) {
  .brand-sub {
    display: none;
  }

  .hero-title,
  .page-title {
    font-size: 22px;
  }

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

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

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

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

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}