:root {
  --color-primary: #1F6F6B;
  --color-primary-dark: #175551;
  --color-accent: #E8A33D;
  --color-bg: #F7F5F0;
  --color-surface: #FFFFFF;
  --color-text: #22302F;
  --color-text-soft: #566A67;
  --color-line: #C9D6D3;
  --color-footer: #14312F;
  --font-head: "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
  --font-mono: "SFMono-Regular", Menlo, Consolas, "Liberation Mono", monospace;
  --radius: 6px;
  --container: 1180px;
  --header-h: 64px;
}

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

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

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

body {
  margin: 0;
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  scroll-padding-top: calc(var(--header-h) + 16px);
}

.site-body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

h1,
h2,
h3,
h4 {
  font-family: var(--font-head);
  color: var(--color-text);
  line-height: 1.35;
  margin: 0 0 12px;
  font-weight: 700;
}

p {
  margin: 0 0 12px;
}

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

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

a:hover {
  color: var(--color-primary-dark);
}

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

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

figure {
  margin: 0;
}

figcaption {
  font-size: 13px;
  line-height: 1.6;
  color: var(--color-text-soft);
}

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

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-line);
}

.header-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
  min-height: var(--header-h);
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--color-text);
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 18px;
  line-height: 1.2;
  padding: 8px 0;
}

.brand:hover {
  color: var(--color-primary-dark);
}

.brand-mark {
  width: 26px;
  height: 26px;
  flex: none;
  border-radius: 4px;
  background-color: var(--color-primary);
  position: relative;
}

.brand-mark::after {
  content: "";
  position: absolute;
  left: 7px;
  top: 6px;
  width: 12px;
  height: 14px;
  border-left: 2px solid #F7F5F0;
  border-right: 2px solid #F7F5F0;
  border-top: 2px solid #F7F5F0;
}

.brand-name {
  white-space: nowrap;
}

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

.nav-list {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-link {
  display: inline-block;
  padding: 10px 14px;
  color: var(--color-text);
  font-size: 15px;
  line-height: 1.4;
  border-bottom: 2px solid transparent;
  border-radius: 4px 4px 0 0;
}

.nav-link:hover {
  color: var(--color-primary-dark);
  background-color: #EDF3F1;
}

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

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

.nav-toggle-bar {
  display: block;
  width: 20px;
  height: 2px;
  margin: 4px auto;
  background-color: var(--color-text);
}

.site-main {
  flex: 1 0 auto;
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px 64px;
}

.inner-main {
  padding-top: 24px;
}

.section {
  margin-top: 56px;
}

.section-title {
  font-size: 24px;
  margin-bottom: 10px;
}

.section-desc,
.section-lead,
.section-intro {
  color: var(--color-text-soft);
  max-width: 780px;
  margin-bottom: 24px;
}

.section-footnote,
.section-note {
  margin-top: 20px;
  padding-top: 14px;
  border-top: 1px dashed var(--color-line);
  font-size: 14px;
  color: var(--color-text-soft);
}

.section-footnote a,
.section-note a,
.map-note a {
  margin-right: 16px;
  font-weight: 600;
}

.section-head {
  margin-bottom: 24px;
}

.section-media,
.section-figure {
  margin: 0 0 24px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  overflow: hidden;
  background-color: var(--color-surface);
}

.section-media img,
.section-figure img {
  width: 100%;
  height: 300px;
  object-fit: cover;
}

.section-media figcaption,
.section-figure figcaption {
  padding: 10px 14px;
  border-top: 1px solid var(--color-line);
}

/* 面包屑与页面标题区（内页统一） */

.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 14px;
  color: var(--color-text-soft);
  padding: 4px 0 0;
}

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

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

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

.page-header {
  margin: 20px 0 8px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--color-line);
}

.page-title {
  font-size: 30px;
  margin-bottom: 10px;
}

.page-description {
  max-width: 820px;
  color: var(--color-text-soft);
  margin-bottom: 0;
}

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

/* 页脚（全站统一） */

.site-footer {
  background-color: var(--color-footer);
  color: #D7E3E0;
  margin-top: auto;
}

.footer-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 48px 24px 32px;
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr 1fr;
  gap: 32px;
}

.footer-brand {
  max-width: 320px;
}

.footer-name {
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 700;
  color: #FFFFFF;
  margin-bottom: 6px;
}

.footer-slogan {
  color: #9FBFBA;
  font-size: 14px;
  margin-bottom: 10px;
}

.footer-desc {
  font-size: 13px;
  line-height: 1.7;
  color: #A9C3BF;
  margin: 0;
}

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

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

.footer-list a {
  color: #C6D8D5;
  font-size: 14px;
  display: inline-block;
  padding: 3px 0;
}

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

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.14);
}

.footer-copy {
  max-width: var(--container);
  margin: 0 auto;
  padding: 18px 24px;
  font-size: 13px;
  color: #93AFAB;
}

/* ==========================================================================
   components · 通用组件
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 22px;
  border-radius: var(--radius);
  font-size: 15px;
  font-weight: 600;
  border: 1px solid transparent;
  transition: background-color 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}

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

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

.btn-ghost {
  background-color: transparent;
  color: var(--color-primary-dark);
  border-color: var(--color-primary);
}

.btn-ghost:hover {
  background-color: #E1EDEA;
  color: var(--color-primary-dark);
}

.col-title,
.column-title,
.sub-title,
.subsection-title {
  font-size: 17px;
  margin-bottom: 12px;
  padding-left: 12px;
  border-left: 3px solid var(--color-accent);
}

/* 编号（等宽字体，指南感） */

.genre-num,
.genre-no,
.step-num,
.step-index,
.collection-index,
.catalog-num,
.record-tag,
.confirm-step,
.next-label {
  font-family: var(--font-mono);
}

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

.top-fact-bar {
  background-color: var(--color-primary-dark);
  color: #E4F0EE;
}

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

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

/* 首屏 */

.hero-section {
  margin-top: 0;
}

.hero-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
  gap: 32px;
  align-items: start;
}

.hero-kicker {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-accent);
  margin-bottom: 10px;
}

.hero-title {
  font-size: 34px;
  margin-bottom: 14px;
}

.hero-lead {
  font-size: 16px;
  color: var(--color-text-soft);
  margin-bottom: 12px;
}

.hero-note {
  font-size: 14px;
  color: var(--color-text-soft);
  padding-left: 12px;
  border-left: 2px solid var(--color-line);
}

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

.hero-catalog {
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 20px;
}

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

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

.catalog-list li:first-child {
  border-top: none;
}

.catalog-link {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 11px 4px;
  color: var(--color-text);
  font-size: 15px;
  min-height: 44px;
}

.catalog-link:hover {
  color: var(--color-primary-dark);
  background-color: #F0F5F3;
}

.catalog-num {
  color: var(--color-accent);
  font-size: 13px;
  flex: none;
}

.hero-media {
  margin-top: 28px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  overflow: hidden;
  background-color: var(--color-surface);
}

.hero-media img {
  width: 100%;
  height: 380px;
  object-fit: cover;
}

.hero-media figcaption {
  padding: 10px 14px;
  border-top: 1px solid var(--color-line);
}

/* 题材频道方向总览 */

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

.genre-row {
  display: grid;
  grid-template-columns: 64px minmax(0, 1fr);
  gap: 16px;
  padding: 18px 4px;
  border-bottom: 1px solid var(--color-line);
}

.genre-num {
  font-size: 15px;
  color: var(--color-accent);
  padding-top: 3px;
}

.genre-name {
  font-size: 18px;
  margin-bottom: 6px;
}

.genre-feature,
.genre-trait {
  font-size: 15px;
  color: var(--color-text-soft);
  margin-bottom: 4px;
}

.genre-audience {
  font-size: 14px;
  color: var(--color-primary-dark);
  margin-bottom: 0;
}

.genre-audience::before {
  content: "适合：";
  color: var(--color-text-soft);
}

/* 专题片单入口 */

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

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

.collection-media {
  border-bottom: 1px solid var(--color-line);
}

.collection-media img {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

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

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

.collection-desc {
  font-size: 15px;
  color: var(--color-text-soft);
  flex: 1 1 auto;
}

.collection-link {
  display: inline-block;
  align-self: flex-start;
  margin-top: 8px;
  padding: 8px 0;
  font-weight: 600;
  min-height: 44px;
  line-height: 28px;
}

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

/* 浏览顺序四步 */

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

.step-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-top: 3px solid var(--color-primary);
  border-radius: var(--radius);
  padding: 18px;
}

.step-num {
  display: block;
  font-size: 13px;
  color: var(--color-accent);
  margin-bottom: 8px;
}

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

.step-check {
  font-size: 14px;
  color: var(--color-text-soft);
  margin-bottom: 0;
}

/* 字段口径与收录边界摘要 */

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

.field-col {
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 20px;
}

.field-list dt {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 15px;
  padding-top: 12px;
  border-top: 1px solid var(--color-line);
}

.field-list dt:first-of-type {
  border-top: none;
  padding-top: 0;
}

.field-list dd {
  margin: 4px 0 0;
  font-size: 14px;
  color: var(--color-text-soft);
}

.col-footnote {
  margin: 12px 0 0;
  font-size: 13px;
  color: var(--color-text-soft);
}

/* 整理记录速览 */

.record-groups {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
}

.record-group {
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 18px;
}

.record-stage {
  font-size: 16px;
  margin-bottom: 10px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-line);
}

.record-list li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px;
  font-size: 14px;
  color: var(--color-text-soft);
  padding: 8px 0;
  border-top: 1px dashed var(--color-line);
}

.record-list li:first-child {
  border-top: none;
}

.record-tag {
  flex: none;
  font-size: 12px;
  color: var(--color-primary-dark);
  background-color: #E4EFEC;
  border-radius: 4px;
  padding: 2px 8px;
}

/* 站内栏目索引 */

.index-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 16px;
}

.index-link {
  display: block;
  min-height: 100%;
  padding: 16px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  color: var(--color-text);
}

.index-link:hover {
  border-color: var(--color-primary);
  background-color: #F0F5F3;
}

.index-name {
  display: block;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 16px;
  margin-bottom: 6px;
}

.index-desc {
  display: block;
  font-size: 13px;
  color: var(--color-text-soft);
  line-height: 1.6;
}

/* ==========================================================================
   pages · 题材频道
   ========================================================================== */

.genre-overview .section-media {
  margin-top: 24px;
}

.genre-table {
  margin-top: 8px;
  border-top: 1px solid var(--color-line);
}

.genre-table .genre-row {
  grid-template-columns: 64px minmax(0, 1fr);
}

.genre-no {
  font-size: 15px;
  color: var(--color-accent);
  padding-top: 3px;
}

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

.genre-detail-col {
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 20px;
}

.genre-detail-col p {
  font-size: 15px;
  color: var(--color-text-soft);
}

.detail-list {
  margin: 12px 0;
  border-top: 1px solid var(--color-line);
}

.detail-list li {
  padding: 10px 0;
  border-bottom: 1px solid var(--color-line);
  font-size: 14px;
  color: var(--color-text-soft);
}

.detail-list strong {
  display: block;
  color: var(--color-text);
  font-size: 15px;
  margin-bottom: 2px;
}

.map-table {
  border-top: 1px solid var(--color-line);
}

.map-row {
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(0, 1fr) minmax(0, 1.4fr);
  gap: 16px;
  align-items: start;
  padding: 16px 4px;
  border-bottom: 1px solid var(--color-line);
}

.map-genre {
  font-size: 16px;
  margin: 0;
}

.map-collection {
  font-size: 14px;
  color: var(--color-primary-dark);
  margin: 0;
}

.map-note {
  font-size: 14px;
  color: var(--color-text-soft);
  margin: 0;
}

.tips-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.tip-item {
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-left: 3px solid var(--color-accent);
  border-radius: var(--radius);
  padding: 18px;
}

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

.tip-item p {
  font-size: 14px;
  color: var(--color-text-soft);
  margin: 0;
}

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

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

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

.collection-item .collection-card {
  border: none;
  border-radius: 0;
  background-color: transparent;
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr);
  gap: 16px;
  padding: 20px 4px;
}

.collection-index {
  font-size: 15px;
  color: var(--color-accent);
  margin: 0;
  padding-top: 3px;
}

.collection-item .collection-name {
  grid-column: 2;
  font-size: 19px;
  margin-bottom: 6px;
}

.collection-theme {
  grid-column: 2;
  font-size: 14px;
  color: var(--color-primary-dark);
  margin-bottom: 6px;
}

.collection-combo {
  grid-column: 2;
  font-size: 15px;
  color: var(--color-text-soft);
  margin-bottom: 4px;
}

.collection-item .collection-link {
  grid-column: 2;
  align-self: start;
}

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

.combo-column {
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 20px;
}

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

.combo-entry {
  padding: 12px 0;
  border-bottom: 1px solid var(--color-line);
  font-size: 14px;
  color: var(--color-text-soft);
}

.combo-key {
  display: block;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 15px;
  color: var(--color-text);
  margin-bottom: 4px;
}

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

.visual-figure {
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  overflow: hidden;
  background-color: var(--color-surface);
}

.visual-figure img {
  width: 100%;
  height: 240px;
  object-fit: cover;
}

.visual-caption {
  padding: 10px 14px;
  border-top: 1px solid var(--color-line);
}

.map-table-wrap {
  overflow-x: auto;
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  background-color: var(--color-surface);
}

.map-caption {
  caption-side: top;
  text-align: left;
  padding: 12px 16px;
  font-size: 14px;
  color: var(--color-text-soft);
  border-bottom: 1px solid var(--color-line);
}

.map-table th,
.map-table td {
  padding: 12px 16px;
  text-align: left;
  font-size: 14px;
  border-bottom: 1px solid var(--color-line);
  vertical-align: top;
}

.map-table thead th {
  background-color: #EDF3F1;
  font-family: var(--font-head);
  color: var(--color-text);
  white-space: nowrap;
}

.map-table tbody tr:last-child td {
  border-bottom: none;
}

.section-collection-map .map-note {
  margin-top: 14px;
}

/* ==========================================================================
   pages · 浏览顺序
   ========================================================================== */

.page-visual {
  margin: 24px 0 0;
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  overflow: hidden;
  background-color: var(--color-surface);
}

.page-visual img {
  width: 100%;
  height: 300px;
  object-fit: cover;
}

.page-visual-caption {
  padding: 10px 14px;
  border-top: 1px solid var(--color-line);
}

.section-order-steps .step-list {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.section-order-steps .step-card {
  border-top-color: var(--color-accent);
}

.section-order-steps .step-index {
  display: block;
  font-size: 13px;
  color: var(--color-accent);
  margin-bottom: 8px;
}

.section-order-steps .step-desc {
  font-size: 14px;
  color: var(--color-text-soft);
  margin: 0;
}

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

.confirm-column {
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 20px;
}

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

.confirm-item {
  display: grid;
  grid-template-columns: 68px minmax(0, 1fr);
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px solid var(--color-line);
}

.confirm-step {
  font-size: 13px;
  color: var(--color-primary-dark);
  padding-top: 2px;
}

.confirm-text {
  margin: 0;
  font-size: 14px;
  color: var(--color-text-soft);
}

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

.hint-item {
  padding: 16px 4px;
  border-bottom: 1px solid var(--color-line);
}

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

.hint-confuse {
  font-size: 14px;
  color: var(--color-text-soft);
  margin-bottom: 4px;
}

.hint-tip {
  font-size: 14px;
  color: var(--color-primary-dark);
  margin: 0;
}

.hint-tip::before {
  content: "提示：";
  color: var(--color-text-soft);
}

.faq-list {
  margin-top: 8px;
  border-top: 1px solid var(--color-line);
}

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

.faq-question {
  display: block;
  width: 100%;
  text-align: left;
  padding: 14px 40px 14px 4px;
  background-color: transparent;
  border: none;
  font-family: var(--font-head);
  font-size: 16px;
  font-weight: 700;
  color: var(--color-text);
  cursor: pointer;
  position: relative;
  min-height: 44px;
}

.faq-question::after {
  content: "+";
  position: absolute;
  right: 10px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--color-primary);
}

.faq-question[aria-expanded="true"]::after {
  content: "−";
}

.faq-answer {
  padding: 0 4px 16px;
  font-size: 14px;
  color: var(--color-text-soft);
  margin: 0;
}

.next-list {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.next-item a {
  display: block;
  min-height: 100%;
  padding: 16px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  color: var(--color-text);
}

.next-item a:hover {
  border-color: var(--color-primary);
  background-color: #F0F5F3;
}

.next-label {
  display: block;
  font-size: 12px;
  color: var(--color-accent);
  margin-bottom: 6px;
}

.next-name {
  display: block;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 16px;
  margin-bottom: 6px;
}

.next-desc {
  display: block;
  font-size: 13px;
  color: var(--color-text-soft);
  line-height: 1.6;
}

/* ==========================================================================
   pages · 字段与边界
   ========================================================================== */

.section-field-table .field-table {
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  overflow: hidden;
  background-color: var(--color-surface);
}

.field-table-caption {
  caption-side: top;
  text-align: left;
  padding: 12px 16px;
  font-size: 14px;
  color: var(--color-text-soft);
  border-bottom: 1px solid var(--color-line);
}

.field-table th,
.field-table td {
  padding: 12px 16px;
  text-align: left;
  font-size: 14px;
  border-bottom: 1px solid var(--color-line);
  vertical-align: top;
  color: var(--color-text-soft);
}

.field-table thead th {
  background-color: #EDF3F1;
  font-family: var(--font-head);
  color: var(--color-text);
  white-space: nowrap;
}

.field-table tbody tr:last-child td {
  border-bottom: none;
}

.field-table .field-name {
  font-family: var(--font-head);
  font-weight: 700;
  color: var(--color-text);
  white-space: nowrap;
}

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

.boundary-col {
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 20px;
}

.boundary-col-range {
  border-top: 3px solid var(--color-primary);
}

.boundary-col-limit {
  border-top: 3px solid var(--color-accent);
}

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

.boundary-list li {
  padding: 11px 0;
  border-bottom: 1px solid var(--color-line);
  font-size: 14px;
  color: var(--color-text-soft);
}

.record-table {
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  overflow: hidden;
  background-color: var(--color-surface);
}

.record-row {
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.4fr) minmax(0, 1.2fr);
}

.record-cell {
  padding: 12px 16px;
  font-size: 14px;
  color: var(--color-text-soft);
  border-bottom: 1px solid var(--color-line);
}

.record-row:last-child .record-cell {
  border-bottom: none;
}

.record-head .record-cell {
  background-color: #EDF3F1;
  font-family: var(--font-head);
  font-weight: 700;
  color: var(--color-text);
}

.record-cell-stage {
  font-family: var(--font-head);
  font-weight: 700;
  color: var(--color-text);
}

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

.error-main {
  padding-top: 48px;
}

.error-hero {
  max-width: 720px;
}

.error-code {
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--color-accent);
  margin-bottom: 10px;
}

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

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

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

.error-paths {
  margin-top: 48px;
  padding-top: 28px;
  border-top: 1px solid var(--color-line);
}

.path-list {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

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

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

.path-desc {
  font-size: 13px;
  color: var(--color-text-soft);
  margin: 0;
}

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

@media (max-width: 1024px) {
  .footer-inner {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 28px;
  }

  .footer-brand {
    grid-column: 1 / -1;
    max-width: 520px;
  }

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

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

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

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

@media (max-width: 768px) {
  .header-inner {
    padding: 0 16px;
    gap: 12px;
  }

  .nav-toggle {
    display: block;
  }

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

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    width: 100%;
    padding: 8px 0 12px;
    border-top: 1px solid var(--color-line);
  }

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

  .nav-link {
    display: block;
    width: 100%;
    padding: 12px 4px;
    font-size: 16px;
    border-bottom: 1px solid var(--color-line);
    border-radius: 0;
  }

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

  .site-main {
    padding: 0 16px 48px;
  }

  .top-fact-bar p {
    padding: 8px 16px;
  }

  .home-main {
    padding-top: 24px;
  }

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

  .hero-media img {
    height: 240px;
  }

  .section {
    margin-top: 40px;
  }

  .section-title {
    font-size: 21px;
  }

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

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

  .genre-num,
  .genre-no {
    padding-top: 0;
  }

  .collection-grid,
  .field-columns,
  .genre-detail-grid,
  .combo-columns,
  .visual-grid,
  .confirm-grid,
  .boundary-columns,
  .record-groups,
  .tips-grid,
  .step-list,
  .section-order-steps .step-list {
    grid-template-columns: minmax(0, 1fr);
  }

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

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

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

  .collection-item .collection-name,
  .collection-theme,
  .collection-combo,
  .collection-item .collection-link {
    grid-column: 1;
  }

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

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

  .record-cell {
    border-bottom: 1px dashed var(--color-line);
  }

  .record-head {
    display: none;
  }

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

  .visual-figure img {
    height: 180px;
  }

  .footer-inner {
    padding: 36px 16px 24px;
  }

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

@media (max-width: 480px) {
  .hero-actions .btn,
  .error-actions .btn {
    width: 100%;
  }

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

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