/* ==========================================================================
   飘花影院 · 全站样式
   分组：base / layout / components / pages / responsive
   ========================================================================== */

/* --------------------------------------------------------------------------
   base
   -------------------------------------------------------------------------- */

:root {
  --c-primary: #1f4e79;
  --c-primary-dark: #173a5a;
  --c-primary-soft: #e8eef4;
  --c-accent: #c0504d;
  --c-text: #2b2b2b;
  --c-text-soft: #5b6773;
  --c-border: #d6dde5;
  --c-surface: #ffffff;
  --c-surface-alt: #f5f8fb;
  --c-footer-bg: #e8eef4;
  --radius: 6px;
  --radius-sm: 4px;
  --shadow-card: 0 1px 2px rgba(31, 78, 121, 0.08);
  --container: 1120px;
  --gap: 20px;
}

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

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

body.site-body {
  margin: 0;
  background: var(--c-surface);
  color: var(--c-text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  font-size: 15px;
  line-height: 1.7;
  font-weight: 400;
}

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

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 {
  text-decoration: underline;
}

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

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

button {
  font: inherit;
  color: inherit;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

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

/* --------------------------------------------------------------------------
   layout · 全站骨架
   -------------------------------------------------------------------------- */

.site-header {
  background: var(--c-surface);
  border-bottom: 1px solid var(--c-border);
  position: sticky;
  top: 0;
  z-index: 30;
}

.header-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 12px 24px;
  display: flex;
  align-items: center;
  gap: 24px;
}

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

.site-main {
  display: block;
}

.inner-main {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px 56px;
}

.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  padding: 18px 0 8px;
  font-size: 13px;
  color: var(--c-text-soft);
}

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

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

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

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

.page-header {
  padding: 8px 0 22px;
  border-bottom: 1px solid var(--c-border);
  margin-bottom: 28px;
}

.page-title {
  font-size: 30px;
  font-weight: 600;
  color: var(--c-primary);
}

.page-description {
  margin-top: 10px;
  max-width: 760px;
  font-size: 15px;
  color: var(--c-text-soft);
}

.page-description a {
  color: var(--c-primary);
}

.site-footer {
  background: var(--c-footer-bg);
  border-top: 1px solid var(--c-border);
  color: var(--c-text);
}

.footer-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 36px 24px 24px;
  display: grid;
  grid-template-columns: minmax(220px, 1.4fr) repeat(4, minmax(130px, 1fr));
  gap: 28px;
}

.footer-bottom {
  border-top: 1px solid var(--c-border);
  background: var(--c-footer-bg);
}

.footer-copy {
  max-width: var(--container);
  margin: 0 auto;
  padding: 14px 24px 20px;
  font-size: 13px;
  color: var(--c-text-soft);
}

/* --------------------------------------------------------------------------
   components · 页头 / 导航
   -------------------------------------------------------------------------- */

.topbar {
  background: var(--c-primary);
  color: #eaf1f8;
}

.topbar-text {
  max-width: var(--container);
  margin: 0 auto;
  padding: 8px 24px;
  font-size: 13px;
  line-height: 1.6;
}

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

.brand:hover {
  text-decoration: none;
}

.brand-mark {
  width: 34px;
  height: 34px;
  flex: 0 0 34px;
  border-radius: var(--radius-sm);
  background: var(--c-primary);
  position: relative;
}

.brand-mark::before,
.brand-mark::after {
  content: "";
  position: absolute;
  left: 9px;
  right: 9px;
  height: 2px;
  background: #ffffff;
}

.brand-mark::before {
  top: 12px;
}

.brand-mark::after {
  top: 19px;
  right: 14px;
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.25;
}

.brand-name {
  font-size: 18px;
  font-weight: 600;
  color: var(--c-primary);
}

.brand-slogan {
  font-size: 12px;
  color: var(--c-text-soft);
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  padding: 0;
  margin-left: auto;
  border: 1px solid var(--c-border);
  border-radius: var(--radius-sm);
  background: var(--c-surface);
  cursor: pointer;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
}

.nav-toggle-bar {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--c-primary);
}

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

.nav-link {
  display: inline-block;
  padding: 9px 14px;
  font-size: 15px;
  color: var(--c-text);
  border-radius: var(--radius-sm);
  border-bottom: 2px solid transparent;
}

.nav-link:hover {
  background: var(--c-primary-soft);
  color: var(--c-primary);
  text-decoration: none;
}

.nav-link.is-current {
  color: var(--c-primary);
  font-weight: 600;
  border-bottom-color: var(--c-primary);
}

/* --------------------------------------------------------------------------
   components · 按钮 / 通用区块
   -------------------------------------------------------------------------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 22px;
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 600;
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
}

.btn:hover {
  text-decoration: none;
}

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

.btn-primary:hover {
  background: var(--c-primary-dark);
  color: #ffffff;
}

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

.btn-ghost:hover {
  background: var(--c-primary-soft);
  color: var(--c-primary);
}

.section {
  max-width: var(--container);
  margin: 0 auto;
  padding: 36px 24px;
  border-top: 1px solid var(--c-border);
}

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

.section-title {
  font-size: 22px;
  font-weight: 600;
  color: var(--c-primary);
}

.section-desc {
  margin-top: 8px;
  max-width: 780px;
  font-size: 14px;
  color: var(--c-text-soft);
}

.section-desc a {
  color: var(--c-primary);
}

.section-note {
  margin-top: 16px;
  font-size: 14px;
  color: var(--c-text-soft);
}

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

.section-intro {
  margin-top: 8px;
  max-width: 780px;
  font-size: 14px;
  color: var(--c-text-soft);
}

.section-intro a {
  color: var(--c-primary);
}

.section-lead {
  margin-top: 8px;
  max-width: 780px;
  font-size: 14px;
  color: var(--c-text-soft);
}

.section-lead a {
  color: var(--c-primary);
}

.section-media,
.section-figure,
.guide-figure {
  margin: 0 0 20px;
}

.section-media img,
.section-figure img,
.guide-figure img {
  width: 100%;
  height: auto;
  border-radius: var(--radius);
  border: 1px solid var(--c-border);
  object-fit: cover;
  background: var(--c-surface-alt);
}

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

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

/* --------------------------------------------------------------------------
   components · 表格
   -------------------------------------------------------------------------- */

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

.data-table {
  min-width: 680px;
  font-size: 14px;
}

.table-caption {
  caption-side: top;
  text-align: left;
  padding: 12px 16px;
  font-size: 13px;
  color: var(--c-text-soft);
}

.data-table thead th {
  background: var(--c-primary-soft);
  color: var(--c-primary);
  font-weight: 600;
  text-align: left;
  padding: 11px 16px;
  border-bottom: 1px solid var(--c-border);
  white-space: nowrap;
}

.data-table tbody td,
.data-table tbody th {
  padding: 11px 16px;
  border-bottom: 1px solid var(--c-border);
  vertical-align: top;
  text-align: left;
}

.data-table tbody th {
  font-weight: 600;
  color: var(--c-primary);
  background: var(--c-surface-alt);
}

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

.data-table tbody tr:hover td,
.data-table tbody tr:hover th {
  background: #f2f7fb;
}

.cell-code {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  font-variant-numeric: tabular-nums;
  color: var(--c-accent);
  font-weight: 600;
  white-space: nowrap;
}

.cell-name {
  font-weight: 600;
  color: var(--c-primary);
  white-space: nowrap;
}

/* --------------------------------------------------------------------------
   pages · 首页
   -------------------------------------------------------------------------- */

.home-main {
  display: block;
}

.hero {
  max-width: var(--container);
  margin: 0 auto;
  padding: 40px 24px 36px;
}

.hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
  gap: 40px;
  align-items: start;
}

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

.hero-kicker {
  display: inline-block;
  padding: 4px 10px;
  margin-bottom: 14px;
  font-size: 13px;
  color: var(--c-primary);
  background: var(--c-primary-soft);
  border-radius: var(--radius-sm);
}

.hero-title {
  font-size: 34px;
  font-weight: 600;
  color: var(--c-primary);
  line-height: 1.3;
}

.hero-lead {
  margin-top: 14px;
  max-width: 560px;
  font-size: 15px;
  color: var(--c-text);
}

.hero-points {
  margin-top: 18px;
  display: grid;
  gap: 8px;
}

.hero-points li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  color: var(--c-text-soft);
}

.hero-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--c-accent);
}

.hero-actions {
  margin-top: 24px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.hero-figure {
  margin: 0;
  min-width: 0;
}

.hero-figure img {
  width: 100%;
  height: auto;
  border-radius: var(--radius);
  border: 1px solid var(--c-border);
  object-fit: cover;
  background: var(--c-surface-alt);
}

.hero-caption {
  margin-top: 10px;
  font-size: 13px;
  color: var(--c-text-soft);
}

.section-channels .section-figure {
  margin: 20px 0 0;
}

.section-collections .collection-grid {
  margin-top: 4px;
}

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

.collection-card {
  display: flex;
  flex-direction: column;
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  background: var(--c-surface);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  transition: border-color 0.18s ease, box-shadow 0.18s ease;
}

.collection-card:hover {
  border-color: var(--c-primary);
  box-shadow: 0 3px 10px rgba(31, 78, 121, 0.12);
}

.collection-media {
  margin: 0;
  background: var(--c-surface-alt);
}

.collection-media img {
  width: 100%;
  height: 180px;
  object-fit: cover;
}

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

.collection-name {
  font-size: 17px;
  font-weight: 600;
  color: var(--c-primary);
}

.collection-topic {
  margin-top: 6px;
  font-size: 13px;
  color: var(--c-accent);
  font-weight: 600;
}

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

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

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

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

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

.section-steps .step-item {
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  background: var(--c-surface-alt);
  padding: 18px 16px;
  min-width: 0;
}

.section-steps .step-no {
  display: inline-block;
  margin-bottom: 10px;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  font-size: 13px;
  font-weight: 600;
  color: #ffffff;
  background: var(--c-primary);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
}

.section-steps .step-name {
  font-size: 16px;
  font-weight: 600;
  color: var(--c-primary);
}

.section-steps .step-desc {
  margin-top: 8px;
  font-size: 14px;
  color: var(--c-text);
}

.section-steps .step-check {
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px dashed var(--c-border);
  font-size: 13px;
  color: var(--c-accent);
}

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

.record-group {
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 16px 18px;
  background: var(--c-surface);
  min-width: 0;
}

.record-month {
  font-size: 16px;
  font-weight: 600;
  color: var(--c-primary);
  padding-bottom: 10px;
  border-bottom: 1px solid var(--c-border);
}

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

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

.record-scope {
  display: inline-block;
  margin-bottom: 4px;
  font-size: 12px;
  font-weight: 600;
  color: var(--c-accent);
  border: 1px solid var(--c-accent);
  border-radius: var(--radius-sm);
  padding: 1px 7px;
}

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

.index-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 14px;
}

.index-card {
  display: block;
  padding: 16px 14px;
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  background: var(--c-surface-alt);
  color: var(--c-text);
  min-width: 0;
  transition: border-color 0.18s ease, background 0.18s ease;
}

.index-card:hover {
  border-color: var(--c-primary);
  background: var(--c-primary-soft);
  text-decoration: none;
}

.index-code {
  display: block;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  font-size: 12px;
  font-weight: 600;
  color: var(--c-accent);
  margin-bottom: 6px;
}

.index-name {
  font-size: 15px;
  font-weight: 600;
  color: var(--c-primary);
}

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

/* --------------------------------------------------------------------------
   pages · 内页（题材频道 / 专题片单 / 浏览指引 / 整理记录）
   -------------------------------------------------------------------------- */

.content-section {
  padding: 0 0 36px;
  margin-bottom: 36px;
  border-bottom: 1px solid var(--c-border);
}

.content-section:last-of-type {
  border-bottom: 0;
  margin-bottom: 0;
}

.subsection-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--c-primary);
  margin-bottom: 12px;
}

/* 题材频道页 */

.channels-table-section .section-media {
  margin: 0 0 20px;
}

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

.advice-item {
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  background: var(--c-surface-alt);
  padding: 18px 16px;
  min-width: 0;
}

.advice-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--c-primary);
}

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

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

.map-col {
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 18px 18px 12px;
  background: var(--c-surface);
  min-width: 0;
}

.map-col-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--c-primary);
  padding-bottom: 10px;
  border-bottom: 1px solid var(--c-border);
  margin-bottom: 10px;
}

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

.map-item {
  font-size: 14px;
  padding: 6px 0;
  border-bottom: 1px dashed var(--c-border);
}

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

.map-item a {
  color: var(--c-text);
}

.map-item a:hover {
  color: var(--c-primary);
}

/* 专题片单页 */

.collections-directory .collection-grid {
  margin-top: 18px;
}

.composition-table {
  min-width: 620px;
  margin-top: 18px;
}

.composition-table tbody th {
  white-space: nowrap;
}

.cross-map-layout {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--gap);
  margin-top: 18px;
}

.cross-map-column {
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 18px;
  background: var(--c-surface-alt);
  min-width: 0;
}

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

.cross-item {
  font-size: 14px;
  color: var(--c-text);
  padding: 6px 0;
  border-bottom: 1px dashed var(--c-border);
}

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

.cross-note {
  margin-top: 16px;
  font-size: 14px;
  color: var(--c-text-soft);
}

.cross-note a {
  color: var(--c-primary);
}

/* 浏览指引页 */

.guide-steps {
  padding: 0 0 36px;
  margin-bottom: 36px;
  border-bottom: 1px solid var(--c-border);
}

.guide-steps .step-list {
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  margin-top: 20px;
}

.guide-steps .step-item {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  gap: 16px;
  align-items: start;
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  background: var(--c-surface);
  padding: 18px;
  min-width: 0;
}

.guide-steps .step-index {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  background: var(--c-primary);
  color: #ffffff;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  font-size: 15px;
  font-weight: 600;
}

.guide-steps .step-body {
  min-width: 0;
}

.guide-steps .step-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--c-primary);
}

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

.guide-steps .step-text a {
  color: var(--c-primary);
}

.guide-steps .step-note {
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px dashed var(--c-border);
  font-size: 13px;
  color: var(--c-text-soft);
}

.note-flag {
  display: inline-block;
  margin-right: 6px;
  padding: 1px 7px;
  font-size: 12px;
  font-weight: 600;
  color: #ffffff;
  background: var(--c-accent);
  border-radius: var(--radius-sm);
}

.field-glossary {
  padding: 0 0 36px;
  margin-bottom: 36px;
  border-bottom: 1px solid var(--c-border);
}

.glossary-table {
  min-width: 640px;
  margin-top: 18px;
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  overflow: hidden;
}

.glossary-table thead th {
  background: var(--c-primary-soft);
  color: var(--c-primary);
  font-weight: 600;
  text-align: left;
  padding: 11px 16px;
  border-bottom: 1px solid var(--c-border);
}

.glossary-table tbody th,
.glossary-table tbody td {
  padding: 11px 16px;
  border-bottom: 1px solid var(--c-border);
  text-align: left;
  vertical-align: top;
  font-size: 14px;
}

.glossary-table tbody th {
  font-weight: 600;
  color: var(--c-primary);
  background: var(--c-surface-alt);
  white-space: nowrap;
}

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

.glossary-note {
  margin-top: 16px;
  font-size: 14px;
  color: var(--c-text-soft);
}

.glossary-note a {
  color: var(--c-primary);
}

.coverage-boundary {
  padding: 0 0 36px;
  margin-bottom: 36px;
  border-bottom: 1px solid var(--c-border);
}

.boundary-list {
  margin: 18px 0 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

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

.boundary-term {
  font-size: 15px;
  font-weight: 600;
  color: var(--c-primary);
}

.boundary-desc {
  margin: 6px 0 0;
  font-size: 14px;
  color: var(--c-text);
}

.boundary-note {
  margin-top: 16px;
  font-size: 14px;
  color: var(--c-text-soft);
}

.boundary-note a {
  color: var(--c-primary);
}

.guide-faq {
  padding: 0;
}

.faq-item {
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  background: var(--c-surface);
  margin-top: 12px;
  overflow: hidden;
}

.faq-question {
  cursor: pointer;
  padding: 14px 18px;
  font-size: 15px;
  font-weight: 600;
  color: var(--c-primary);
  background: var(--c-surface-alt);
  list-style: none;
}

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

.faq-question::after {
  content: "+";
  float: right;
  font-weight: 600;
  color: var(--c-accent);
}

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

.faq-answer {
  padding: 14px 18px;
  font-size: 14px;
  color: var(--c-text);
  border-top: 1px solid var(--c-border);
}

/* 整理记录页 */

.records-section {
  padding: 0 0 36px;
  margin-bottom: 36px;
  border-bottom: 1px solid var(--c-border);
}

.records-months {
  margin-top: 18px;
  display: grid;
  gap: 14px;
}

.records-month {
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  background: var(--c-surface);
  overflow: hidden;
}

.records-month-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  padding: 14px 18px;
  cursor: pointer;
  background: var(--c-surface-alt);
  list-style: none;
}

.records-month-head::-webkit-details-marker {
  display: none;
}

.records-month-head::after {
  content: "展开";
  margin-left: auto;
  font-size: 13px;
  color: var(--c-primary);
}

.records-month[open] .records-month-head::after {
  content: "收起";
}

.records-month-label {
  font-size: 16px;
  font-weight: 600;
  color: var(--c-primary);
  font-variant-numeric: tabular-nums;
}

.records-month-scope {
  font-size: 12px;
  font-weight: 600;
  color: var(--c-accent);
  border: 1px solid var(--c-accent);
  border-radius: var(--radius-sm);
  padding: 1px 7px;
}

.records-list {
  padding: 14px 18px 18px;
  display: grid;
  gap: 14px;
}

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

.records-item-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--c-primary);
}

.records-item-body {
  margin-top: 6px;
  font-size: 14px;
  color: var(--c-text);
}

.glossary-changes-section {
  padding: 0 0 36px;
  margin-bottom: 36px;
  border-bottom: 1px solid var(--c-border);
}

.glossary-change-table {
  min-width: 720px;
}

.glossary-change-table tbody th {
  white-space: nowrap;
}

.guide-map-section {
  padding: 0;
}

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

.guide-map-item {
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  background: var(--c-surface-alt);
  padding: 18px;
  min-width: 0;
}

.guide-map-month {
  font-size: 16px;
  font-weight: 600;
  color: var(--c-primary);
  font-variant-numeric: tabular-nums;
}

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

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

/* --------------------------------------------------------------------------
   pages · 404
   -------------------------------------------------------------------------- */

.error-main {
  max-width: var(--container);
  margin: 0 auto;
  padding: 56px 24px 64px;
}

.error-panel {
  max-width: 720px;
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  background: var(--c-surface-alt);
  padding: 32px 28px;
}

.error-code {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  font-size: 40px;
  font-weight: 600;
  color: var(--c-accent);
  line-height: 1.1;
}

.error-title {
  margin-top: 10px;
  font-size: 26px;
  font-weight: 600;
  color: var(--c-primary);
}

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

.error-actions {
  margin-top: 24px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.error-links {
  margin-top: 30px;
  padding-top: 22px;
  border-top: 1px solid var(--c-border);
}

.error-links-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--c-primary);
}

.error-links-list {
  margin-top: 12px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}

.error-links-list li a {
  display: block;
  padding: 10px 14px;
  min-height: 44px;
  border: 1px solid var(--c-border);
  border-radius: var(--radius-sm);
  background: var(--c-surface);
  color: var(--c-primary);
  font-size: 14px;
  line-height: 24px;
}

.error-links-list li a:hover {
  background: var(--c-primary-soft);
  text-decoration: none;
}

/* --------------------------------------------------------------------------
   components · 页脚
   -------------------------------------------------------------------------- */

.footer-brand {
  min-width: 0;
}

.footer-name {
  font-size: 17px;
  font-weight: 600;
  color: var(--c-primary);
}

.footer-desc {
  margin-top: 8px;
  font-size: 13px;
  color: var(--c-text-soft);
  max-width: 320px;
}

.footer-group {
  min-width: 0;
}

.footer-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--c-primary);
  margin-bottom: 10px;
}

.footer-list {
  display: grid;
  gap: 7px;
}

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

.footer-list a:hover {
  color: var(--c-primary);
}

/* --------------------------------------------------------------------------
   responsive
   -------------------------------------------------------------------------- */

@media (max-width: 1024px) {
  .hero-inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 28px;
  }

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

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

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

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

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

@media (max-width: 768px) {
  .header-inner {
    flex-wrap: wrap;
    gap: 12px;
    padding: 10px 16px;
  }

  .nav-toggle {
    display: flex;
  }

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

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

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

  .nav-link {
    display: block;
    min-height: 44px;
    padding: 11px 12px;
    border-bottom: 0;
    border-left: 3px solid transparent;
  }

  .nav-link.is-current {
    border-bottom-color: transparent;
    border-left-color: var(--c-primary);
    background: var(--c-primary-soft);
  }

  .topbar-text {
    padding: 8px 16px;
  }

  .hero {
    padding: 28px 16px 28px;
  }

  .hero-title {
    font-size: 27px;
  }

  .section {
    padding: 28px 16px;
  }

  .inner-main {
    padding: 0 16px 44px;
  }

  .page-title {
    font-size: 25px;
  }

  .collection-grid,
  .map-columns,
  .cross-map-layout,
  .boundary-list,
  .selection-advice-section .advice-list,
  .guide-map-grid,
  .error-links-list {
    grid-template-columns: minmax(0, 1fr);
  }

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

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

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

  .guide-steps .step-item {
    grid-template-columns: 44px minmax(0, 1fr);
    gap: 12px;
    padding: 16px;
  }

  .guide-steps .step-index {
    width: 40px;
    height: 40px;
    font-size: 14px;
  }

  .footer-inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 22px;
    padding: 28px 16px 20px;
  }

  .footer-copy {
    padding: 14px 16px 20px;
  }

  .error-main {
    padding: 36px 16px 48px;
  }

  .error-panel {
    padding: 24px 18px;
  }

  .error-code {
    font-size: 34px;
  }

  .error-title {
    font-size: 22px;
  }
}

@media (max-width: 420px) {
  .hero-title {
    font-size: 24px;
  }

  .page-title {
    font-size: 23px;
  }

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

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

  .collection-media img {
    height: 160px;
  }
}