/* ==========================================================================
   aoefo.cn 全站样式
   分组：base / layout / components / pages / responsive
   ========================================================================== */

/* --------------------------------------------------------------------------
   base
   -------------------------------------------------------------------------- */
:root {
  --color-primary: #8a4b2a;
  --color-primary-dark: #6f3a1e;
  --color-bg: #faf7f2;
  --color-surface: #ffffff;
  --color-text: #2c2622;
  --color-text-soft: #6b5f55;
  --color-line: #e6ddd2;
  --color-accent: #d97734;
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --shadow-soft: 0 1px 2px rgba(44, 38, 34, 0.06), 0 6px 16px rgba(44, 38, 34, 0.05);
  --container: 1120px;
  --content: 720px;
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans CJK SC", system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

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

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

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
}

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

p {
  margin: 0;
}

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

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

a:hover {
  color: var(--color-accent);
}

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

figure {
  margin: 0;
}

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

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  padding: 0;
  cursor: pointer;
}

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

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

.skip-link {
  position: absolute;
  left: 12px;
  top: -48px;
  z-index: 60;
  padding: 10px 16px;
  background: var(--color-primary);
  color: #fff;
  border-radius: var(--radius-sm);
  transition: top 0.18s ease;
}

.skip-link:focus {
  top: 12px;
  color: #fff;
}

/* --------------------------------------------------------------------------
   layout
   -------------------------------------------------------------------------- */
.site-body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  background: var(--color-bg);
  color: var(--color-text);
}

.site-main {
  flex: 1 1 auto;
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 32px 24px 56px;
}

.home-main {
  padding-top: 0;
}

.inner-main {
  max-width: var(--container);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(250, 247, 242, 0.96);
  border-bottom: 1px solid var(--color-line);
  backdrop-filter: saturate(140%) blur(6px);
}

.header-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
  min-height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

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

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

.brand-mark {
  color: var(--color-primary);
  font-size: 19px;
}

.brand-sub {
  color: var(--color-text-soft);
  font-size: 13px;
  font-weight: 400;
  border-left: 1px solid var(--color-line);
  padding-left: 10px;
}

.site-nav {
  display: flex;
  align-items: center;
}

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

.nav-link {
  display: inline-block;
  padding: 12px 14px;
  min-height: 44px;
  color: var(--color-text);
  font-size: 15px;
  border-bottom: 2px solid transparent;
}

.nav-link:hover {
  color: var(--color-primary);
}

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

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
}

.nav-toggle-bar {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--color-text);
  border-radius: 1px;
}

.site-footer {
  background: #f3ece3;
  border-top: 1px solid var(--color-line);
  color: var(--color-text);
  margin-top: 8px;
}

.footer-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 40px 24px 28px;
  display: grid;
  grid-template-columns: minmax(220px, 1.4fr) repeat(3, minmax(150px, 1fr));
  gap: 32px;
}

.footer-brand-name {
  font-weight: 700;
  font-size: 17px;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.footer-brand-desc {
  font-size: 14px;
  line-height: 1.75;
  color: var(--color-text-soft);
  max-width: 320px;
}

.footer-col-title {
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--color-text);
}

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

.footer-list a {
  display: inline-block;
  min-height: 30px;
  font-size: 14px;
  color: var(--color-text-soft);
}

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

.footer-bottom {
  border-top: 1px solid var(--color-line);
  max-width: var(--container);
  margin: 0 auto;
  padding: 18px 24px 32px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 24px;
  font-size: 14px;
  color: var(--color-text-soft);
}

.footer-boundary {
  flex: 1 1 320px;
  min-width: 220px;
}

.footer-copy {
  flex: 0 1 auto;
}

.footer-top {
  margin-left: auto;
  padding: 8px 14px;
  min-height: 40px;
  display: inline-flex;
  align-items: center;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  color: var(--color-text);
  font-size: 14px;
}

.footer-top:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

/* --------------------------------------------------------------------------
   components
   -------------------------------------------------------------------------- */

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 12px 22px;
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 700;
  border: 1px solid transparent;
  text-align: center;
}

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

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

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

.btn-ghost:hover {
  background: rgba(138, 75, 42, 0.08);
  color: var(--color-primary-dark);
}

/* 面包屑 */
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 14px;
  color: var(--color-text-soft);
  margin-bottom: 18px;
}

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

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

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

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

/* 内页标题区 */
.page-header {
  margin-bottom: 32px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--color-line);
}

.page-title {
  font-size: 32px;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 12px;
}

.page-description {
  max-width: var(--content);
  font-size: 16px;
  line-height: 1.8;
  color: var(--color-text-soft);
}

.page-description a {
  border-bottom: 1px solid var(--color-line);
}

/* 通用区块 */
.section {
  margin-bottom: 48px;
}

.section:last-child {
  margin-bottom: 0;
}

.section-head {
  margin-bottom: 22px;
}

.section-title {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 10px;
  padding-left: 12px;
  border-left: 3px solid var(--color-accent);
}

.section-sub,
.section-intro {
  max-width: var(--content);
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-text-soft);
}

.section-sub a,
.section-intro a,
.section-note a,
.section-tail a,
.section-foot a,
.channel-path-note a {
  border-bottom: 1px solid var(--color-line);
}

/* 字段标签 */
.field-key,
.feature-label {
  display: inline-block;
  margin-right: 6px;
  font-size: 13px;
  font-weight: 700;
  color: var(--color-primary);
  background: rgba(138, 75, 42, 0.08);
  border-radius: 3px;
  padding: 1px 7px;
}

/* 字段表格 */
.field-table {
  font-size: 15px;
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.field-table caption,
.table-caption,
.field-table-caption {
  caption-side: top;
  text-align: left;
  padding: 12px 16px;
  font-size: 14px;
  color: var(--color-text-soft);
  background: #f7f1e9;
  border-bottom: 1px solid var(--color-line);
}

.field-table th,
.field-table td {
  padding: 13px 16px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--color-line);
  font-weight: 400;
  line-height: 1.7;
}

.field-table thead th {
  background: #f7f1e9;
  font-weight: 700;
  font-size: 14px;
  color: var(--color-text);
  white-space: nowrap;
}

.field-table tbody th {
  font-weight: 700;
  color: var(--color-primary);
  width: 22%;
  white-space: nowrap;
}

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

.field-table tbody tr:hover {
  background: #fdfaf6;
}

/* 编号步骤清单 */
.step-list {
  display: grid;
  gap: 14px;
}

.step-item {
  display: flex;
  gap: 16px;
  padding: 18px 20px;
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
}

.step-no,
.step-index {
  flex: 0 0 auto;
  width: 34px;
  height: 34px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: rgba(217, 119, 52, 0.12);
  color: var(--color-accent);
  font-weight: 700;
  font-size: 15px;
}

.step-body {
  flex: 1 1 auto;
  min-width: 0;
}

.step-name {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 6px;
}

.step-desc,
.step-text {
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-text-soft);
}

.step-meta {
  margin-top: 8px;
  font-size: 13px;
  color: var(--color-text-soft);
}

/* FAQ 折叠 */
.faq-item {
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
}

.faq-item + .faq-item {
  margin-top: 12px;
}

.faq-question {
  list-style: none;
  cursor: pointer;
  padding: 16px 44px 16px 18px;
  min-height: 48px;
  position: relative;
  font-size: 16px;
  font-weight: 700;
  color: var(--color-text);
}

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

.faq-question::after {
  content: "";
  position: absolute;
  right: 18px;
  top: 50%;
  width: 9px;
  height: 9px;
  border-right: 2px solid var(--color-primary);
  border-bottom: 2px solid var(--color-primary);
  transform: translateY(-70%) rotate(45deg);
  transition: transform 0.2s ease;
}

.faq-item[open] .faq-question::after {
  transform: translateY(-30%) rotate(-135deg);
}

.faq-question:hover {
  color: var(--color-primary);
}

.faq-answer {
  padding: 14px 18px 18px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-text-soft);
  border-top: 1px solid var(--color-line);
}

.faq-answer p + p {
  margin-top: 10px;
}

/* 图片容器 */
.media,
.fields-media,
.channel-figure,
.guide-figure,
.feature-media,
.hero-media,
.channel-gallery-item {
  overflow: hidden;
  border-radius: var(--radius-md);
  background: #efe7dc;
}

.media-caption,
.figure-caption,
.channel-figure-caption,
.channel-gallery-item figcaption {
  padding: 10px 14px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--color-text-soft);
  background: var(--color-surface);
  border-top: 1px solid var(--color-line);
}

/* --------------------------------------------------------------------------
   pages — 首页
   -------------------------------------------------------------------------- */
.hero {
  padding: 40px 0 8px;
}

.hero-inner {
  display: grid;
  grid-template-columns: minmax(320px, 1fr) minmax(320px, 1.05fr);
  gap: 36px;
  align-items: center;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--color-line);
}

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

.hero-title {
  font-size: 34px;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 14px;
}

.hero-text {
  max-width: 520px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--color-text-soft);
  margin-bottom: 22px;
}

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

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

.hero-media img {
  width: 100%;
  aspect-ratio: 16 / 10;
  height: auto;
  object-fit: cover;
}

.hero-clues {
  padding: 28px 0 4px;
}

.clues-title {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--color-text-soft);
}

.clue-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 14px;
}

.clue-item {
  display: flex;
  gap: 14px;
  padding: 16px 18px;
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
}

.clue-no {
  flex: 0 0 auto;
  font-size: 15px;
  font-weight: 700;
  color: var(--color-accent);
  line-height: 1.6;
}

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

.clue-name {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 6px;
}

.clue-desc {
  font-size: 14px;
  line-height: 1.75;
  color: var(--color-text-soft);
}

/* 首页题材频道行 */
.channel-rows {
  border-top: 1px solid var(--color-line);
}

.channel-rows .channel-row {
  display: grid;
  grid-template-columns: minmax(180px, 0.9fr) minmax(260px, 1.6fr) minmax(200px, 1fr);
  gap: 24px;
  padding: 20px 0;
  border-bottom: 1px solid var(--color-line);
}

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

.channel-name {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 6px;
}

.channel-tag {
  display: inline-block;
  font-size: 12px;
  color: var(--color-primary);
  border: 1px solid var(--color-line);
  border-radius: 3px;
  padding: 1px 8px;
  background: var(--color-surface);
}

.channel-desc-cell p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-text-soft);
}

.scope-label {
  font-size: 13px;
  font-weight: 700;
  color: var(--color-accent);
  margin-bottom: 4px;
}

.channel-scope-cell p:last-child {
  font-size: 14px;
  line-height: 1.75;
  color: var(--color-text-soft);
}

/* 首页专题片单 */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

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

.feature-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-soft);
}

.feature-media {
  border-radius: 0;
  border-bottom: 1px solid var(--color-line);
}

.feature-media img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

.feature-body {
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.feature-name,
.feature-title {
  font-size: 17px;
  font-weight: 700;
}

.feature-scope,
.feature-compose,
.feature-note {
  font-size: 14px;
  line-height: 1.75;
  color: var(--color-text-soft);
}

.feature-note {
  padding-top: 10px;
  border-top: 1px dashed var(--color-line);
}

/* 首页字段说明图 */
.fields-media {
  margin-bottom: 20px;
  border: 1px solid var(--color-line);
}

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

/* 首页收录边界 */
.boundary-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
  margin-bottom: 18px;
}

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

.boundary-name {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 8px;
}

.boundary-item p {
  font-size: 14px;
  line-height: 1.8;
  color: var(--color-text-soft);
}

.boundary-note {
  font-size: 14px;
  line-height: 1.8;
  color: var(--color-text-soft);
  padding: 16px 18px;
  background: #f7f1e9;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
}

/* --------------------------------------------------------------------------
   pages — 题材频道
   -------------------------------------------------------------------------- */
.channel-figure {
  margin-bottom: 32px;
  border: 1px solid var(--color-line);
}

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

.channel-section {
  margin-bottom: 44px;
}

.channel-section .section-title,
.channel-path .section-title,
.channel-gallery .section-title,
.channel-tips .section-title {
  margin-bottom: 10px;
}

.channel-section .section-intro,
.channel-path .section-intro,
.channel-gallery .section-intro,
.channel-tips .section-intro {
  margin-bottom: 20px;
}

.channel-section .channel-row {
  display: grid;
  grid-template-columns: minmax(170px, 0.85fr) minmax(280px, 1.7fr) minmax(200px, 1fr);
  gap: 24px;
  padding: 22px 0;
  border-top: 1px solid var(--color-line);
}

.channel-section .channel-row:last-child {
  border-bottom: 1px solid var(--color-line);
}

.channel-row-name {
  min-width: 0;
}

.channel-row-index {
  display: block;
  font-size: 13px;
  font-weight: 700;
  color: var(--color-accent);
  margin-bottom: 4px;
}

.channel-row-title {
  font-size: 17px;
  font-weight: 700;
}

.channel-row-desc,
.channel-row-scope {
  min-width: 0;
}

.channel-row-desc p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-text-soft);
}

.channel-row-scope p:last-child {
  font-size: 14px;
  line-height: 1.75;
  color: var(--color-text-soft);
}

.channel-gallery {
  margin-bottom: 44px;
}

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

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

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

.channel-path {
  margin-bottom: 44px;
}

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

.path-item {
  padding: 16px 18px;
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
}

.path-step {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 6px;
  color: var(--color-primary);
}

.path-desc {
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-text-soft);
}

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

.channel-tips {
  margin-bottom: 8px;
}

.channel-tips .tip-item {
  padding: 16px 18px;
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
}

.channel-tips .tip-item + .tip-item {
  margin-top: 12px;
}

.tip-title {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 6px;
}

.channel-tips .tip-item p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-text-soft);
}

/* --------------------------------------------------------------------------
   pages — 专题片单
   -------------------------------------------------------------------------- */
.feature-list-section {
  margin-bottom: 48px;
}

.feature-list-section .section-intro {
  margin-bottom: 22px;
}

.feature-map-section {
  margin-bottom: 48px;
}

.feature-map-table {
  margin-top: 4px;
}

.feature-map-table tbody th {
  width: 26%;
}

.feature-steps-section {
  margin-bottom: 48px;
}

.feature-steps-section .step-list {
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.feature-faq-section .faq-item {
  margin-bottom: 12px;
}

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

/* --------------------------------------------------------------------------
   pages — 查阅路径
   -------------------------------------------------------------------------- */
.page-layout {
  display: grid;
  gap: 40px;
}

.guide-layout {
  grid-template-columns: 1fr;
}

.guide-steps,
.guide-outcomes,
.guide-faq {
  min-width: 0;
}

.guide-steps .section-intro,
.guide-outcomes .section-intro,
.guide-faq .section-intro {
  margin-bottom: 20px;
}

.guide-steps .step-list {
  margin-bottom: 24px;
}

.guide-figure {
  border: 1px solid var(--color-line);
}

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

.guide-outcomes {
  margin-top: 8px;
}

.outcome-table {
  font-size: 15px;
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.outcome-table th,
.outcome-table td {
  padding: 13px 16px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--color-line);
  font-weight: 400;
  line-height: 1.7;
}

.outcome-table thead th {
  background: #f7f1e9;
  font-weight: 700;
  font-size: 14px;
  white-space: nowrap;
}

.outcome-table tbody th {
  font-weight: 700;
  color: var(--color-primary);
  width: 22%;
  white-space: nowrap;
}

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

.section-note {
  margin-top: 14px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--color-text-soft);
}

.guide-faq {
  margin-top: 8px;
}

/* --------------------------------------------------------------------------
   pages — 收录边界与反馈
   -------------------------------------------------------------------------- */
.section-scope,
.section-rules,
.section-feedback {
  margin-bottom: 48px;
}

.section-scope .section-intro,
.section-rules .section-intro,
.section-feedback .section-intro {
  margin-bottom: 20px;
}

.media-scope {
  margin-bottom: 24px;
  border: 1px solid var(--color-line);
}

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

.scope-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 16px;
}

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

.scope-name {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--color-primary);
}

.scope-desc {
  font-size: 14px;
  line-height: 1.8;
  color: var(--color-text-soft);
}

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

.section-feedback .step-list {
  margin-bottom: 24px;
}

.section-feedback .boundary-note {
  padding: 20px 22px;
  background: #f7f1e9;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
}

.boundary-note-title {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 12px;
}

.boundary-note-list {
  display: grid;
  gap: 8px;
  margin-bottom: 14px;
}

.boundary-note-list li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--color-text-soft);
}

.boundary-note-list li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 10px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--color-accent);
}

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

/* --------------------------------------------------------------------------
   pages — 404
   -------------------------------------------------------------------------- */
.error-main {
  display: block;
  padding-top: 48px;
}

.error-panel {
  padding: 32px 28px;
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  margin-bottom: 40px;
}

.error-code {
  font-size: 14px;
  font-weight: 700;
  color: var(--color-accent);
  margin-bottom: 10px;
}

.error-panel h1 {
  font-size: 30px;
  font-weight: 700;
  margin-bottom: 14px;
}

.error-text {
  max-width: var(--content);
  font-size: 16px;
  line-height: 1.85;
  color: var(--color-text-soft);
  margin-bottom: 20px;
}

.error-hint-list {
  display: grid;
  gap: 10px;
  margin-bottom: 24px;
}

.error-hint-list li {
  position: relative;
  padding-left: 18px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-text-soft);
}

.error-hint-list li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 11px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--color-primary);
}

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

.error-next {
  padding-bottom: 8px;
}

.error-next h2 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 10px;
}

.error-next-text {
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-text-soft);
  margin-bottom: 16px;
}

.error-next-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 12px;
}

.error-next-list li a {
  display: block;
  padding: 14px 16px;
  min-height: 44px;
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  font-size: 15px;
  color: var(--color-text);
}

.error-next-list li a:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

/* --------------------------------------------------------------------------
   responsive
   -------------------------------------------------------------------------- */
@media (max-width: 960px) {
  .footer-inner {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 28px;
  }

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

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

  .hero-media {
    order: 2;
  }

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

  .channel-rows .channel-row,
  .channel-section .channel-row {
    grid-template-columns: minmax(160px, 0.9fr) minmax(240px, 1.6fr);
  }

  .channel-scope-cell,
  .channel-row-scope {
    grid-column: 1 / -1;
  }
}

@media (max-width: 768px) {
  .site-main {
    padding: 24px 16px 44px;
  }

  .header-inner {
    padding: 0 16px;
    min-height: 58px;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .site-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    padding: 0 16px;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-line);
    box-shadow: 0 8px 18px rgba(44, 38, 34, 0.08);
  }

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px 0;
  }

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

  .nav-link {
    display: flex;
    align-items: center;
    min-height: 48px;
    padding: 12px 6px;
    font-size: 16px;
    border-bottom: 1px solid var(--color-line);
  }

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

  .nav-link.is-current {
    border-bottom-color: var(--color-line);
    border-left: 3px solid var(--color-primary);
    padding-left: 12px;
  }

  .hero {
    padding-top: 28px;
  }

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

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

  .section {
    margin-bottom: 36px;
  }

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

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

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

  .channel-rows .channel-row,
  .channel-section .channel-row {
    grid-template-columns: minmax(0, 1fr);
    gap: 12px;
  }

  .channel-scope-cell,
  .channel-row-scope {
    grid-column: auto;
  }

  .field-table thead th,
  .outcome-table thead th {
    white-space: normal;
  }

  .field-table th,
  .field-table td,
  .outcome-table th,
  .outcome-table td {
    padding: 11px 12px;
    font-size: 14px;
  }

  .field-table tbody th,
  .outcome-table tbody th {
    width: 30%;
    white-space: normal;
  }

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

  .error-panel h1 {
    font-size: 24px;
  }

  .footer-inner {
    padding: 32px 16px 22px;
    gap: 24px;
  }

  .footer-bottom {
    padding: 16px 16px 28px;
  }

  .footer-top {
    margin-left: 0;
  }
}

@media (max-width: 480px) {
  body {
    font-size: 15px;
  }

  .site-main {
    padding: 20px 14px 40px;
  }

  .header-inner {
    padding: 0 14px;
  }

  .brand {
    font-size: 16px;
  }

  .brand-sub {
    display: none;
  }

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

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

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .btn {
    width: 100%;
  }

  .clue-list,
  .boundary-grid,
  .scope-list,
  .error-next-list,
  .feature-steps-section .step-list {
    grid-template-columns: minmax(0, 1fr);
  }

  .step-item {
    padding: 16px 14px;
    gap: 12px;
  }

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

  .footer-brand {
    grid-column: auto;
  }

  .field-table tbody th,
  .outcome-table tbody th {
    width: 34%;
  }
}