/* ==========================================================================
   麻豆高清影院 · 全站样式
   分组：base / layout / components / pages / responsive
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. base
   -------------------------------------------------------------------------- */

:root {
  --paper: #F3EFE4;
  --ink: #1E2A2D;
  --brick: #C4553B;
  --river: #2F6F7E;
  --park: #5D7A4A;
  --route: #D48A2F;
  --line: #D9D3C4;
  --panel: #FFFFFF;
  --muted: #6B726C;
  --ink-soft: #39474A;
  --radius: 6px;
  --radius-sm: 4px;
  --shadow: 0 1px 2px rgba(30, 42, 45, 0.06), 0 6px 18px rgba(30, 42, 45, 0.05);
  --container: 1180px;
  --hero-max: 1120px;
  --gap: 24px;
  --font-serif: "Noto Serif SC", "Songti SC", "STSong", "SimSun", serif;
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", "Menlo", "Consolas", monospace;
}

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

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

body {
  margin: 0;
  background-color: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

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

h1 {
  font-size: clamp(2rem, 4.2vw, 3.25rem);
}

h2 {
  font-size: clamp(1.35rem, 2.2vw, 1.9rem);
}

h3 {
  font-size: 1.12rem;
}

p {
  margin: 0 0 0.9em;
}

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

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

a:hover,
a:focus-visible {
  color: var(--brick);
}

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

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

figure {
  margin: 0;
}

button {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
  cursor: pointer;
}

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

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

.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: 16px;
  top: -60px;
  z-index: 200;
  padding: 10px 18px;
  background-color: var(--ink);
  color: #fff;
  border-radius: var(--radius-sm);
  transition: top 0.2s ease;
}

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

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

.site-body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  background-color: var(--paper);
}

.site-header {
  background-color: var(--paper);
  border-bottom: 1px solid var(--line);
  position: relative;
  z-index: 60;
}

.utility-bar {
  background-color: var(--ink);
  color: #d9d5c8;
  font-size: 0.8rem;
}

.utility-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 7px 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 34px;
}

.utility-lang {
  font-family: var(--font-mono);
  letter-spacing: 0.03em;
  color: #cfcabb;
  white-space: nowrap;
}

.utility-nav {
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
}

.utility-nav a {
  color: #e8e3d5;
  border-bottom: 1px solid transparent;
  padding-bottom: 1px;
}

.utility-nav a:hover,
.utility-nav a:focus-visible {
  color: #fff;
  border-bottom-color: var(--route);
}

.utility-nav a.is-current {
  color: var(--route);
  border-bottom-color: var(--route);
}

.brand-bar {
  background-color: var(--paper);
}

.brand-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 14px 32px;
  display: flex;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
}

.brand-logo {
  display: inline-flex;
  align-items: baseline;
  gap: 10px;
  color: var(--ink);
  flex-shrink: 0;
}

.brand-logo:hover,
.brand-logo:focus-visible {
  color: var(--ink);
}

.brand-mark {
  font-family: var(--font-serif);
  font-size: 1.45rem;
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: 0.01em;
}

.brand-sub {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--muted);
  letter-spacing: 0.06em;
  text-transform: lowercase;
}

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

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

.nav-list > li {
  display: flex;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 12px;
  color: var(--ink-soft);
  font-size: 0.94rem;
  border-bottom: 3px solid transparent;
  transition: color 0.18s ease, border-color 0.18s ease;
}

.nav-link:hover,
.nav-link:focus-visible {
  color: var(--brick);
  border-bottom-color: var(--line);
}

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

.nav-toggle {
  display: none;
  margin-left: auto;
  width: 46px;
  height: 46px;
  padding: 0;
  background-color: transparent;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
}

.nav-toggle-bar {
  display: block;
  width: 20px;
  height: 2px;
  background-color: var(--ink);
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.site-main {
  flex: 1 0 auto;
  width: 100%;
}

.inner-main {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 32px 72px;
}

.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  padding: 22px 0 0;
  font-size: 0.84rem;
  color: var(--muted);
}

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

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

.breadcrumb-sep {
  color: #b8b3a4;
}

.breadcrumb-current {
  color: var(--ink-soft);
  font-weight: 600;
}

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

.breadcrumb-item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.breadcrumb-item + .breadcrumb-item::before {
  content: "/";
  color: #b8b3a4;
}

.breadcrumb-item.is-current {
  color: var(--ink-soft);
  font-weight: 600;
}

.page-header {
  padding: 18px 0 0;
}

.page-title {
  font-size: clamp(1.75rem, 3.4vw, 2.6rem);
  font-weight: 700;
  color: var(--ink);
  margin: 0;
}

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

.footer-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 52px 32px 36px;
  display: grid;
  grid-template-columns: minmax(240px, 1fr) minmax(0, 2fr);
  gap: 48px;
}

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

.footer-logo {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 700;
  color: #f3efe4;
  margin: 0 0 10px;
}

.footer-slogan {
  font-size: 0.9rem;
  line-height: 1.7;
  color: #a9a596;
  margin: 0;
  max-width: 30ch;
}

.footer-nav {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 32px;
}

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

.footer-col-title {
  font-family: var(--font-sans);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: #f3efe4;
  margin: 0 0 14px;
}

.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-col a {
  color: #b7b3a4;
  font-size: 0.9rem;
  display: inline-block;
  padding: 2px 0;
}

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

.footer-bottom {
  border-top: 1px solid rgba(243, 239, 228, 0.14);
}

.footer-bottom {
  max-width: var(--container);
  margin: 0 auto;
  padding: 20px 32px 26px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 28px;
  justify-content: space-between;
  font-size: 0.8rem;
  color: #8f8b7e;
}

.footer-note,
.footer-copy {
  margin: 0;
}

/* 通用 section 容器 */
.section-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 32px;
}

.section-head {
  margin-bottom: 28px;
}

.section-head h2 {
  margin-bottom: 10px;
}

.section-desc,
.section-lead {
  color: var(--muted);
  font-size: 0.96rem;
  line-height: 1.75;
  max-width: 68ch;
  margin: 0;
}

/* --------------------------------------------------------------------------
   3. components · 通用组件
   -------------------------------------------------------------------------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 22px;
  border-radius: var(--radius);
  font-size: 0.95rem;
  font-weight: 600;
  border: 1px solid transparent;
  transition: background-color 0.18s ease, border-color 0.18s ease, color 0.18s ease;
}

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

.btn-primary:hover,
.btn-primary:focus-visible {
  background-color: #a8452e;
  border-color: #a8452e;
  color: #fff;
}

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

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

/* 频道色标圆点 */
.channel-dot {
  display: inline-block;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background-color: var(--line);
  flex-shrink: 0;
}

.channel-dot--earth,
.dot-city {
  background-color: var(--brick);
}

.channel-dot--river,
.dot-scene {
  background-color: var(--river);
}

.channel-dot--park,
.dot-life {
  background-color: var(--park);
}

.channel-dot--orange,
.dot-culture {
  background-color: var(--route);
}

.dot-story {
  background-color: #8a6a9c;
}

.dot-mixed {
  background-color: #7d7a6c;
}

/* 频道标签 */
.channel-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.05em;
  padding: 3px 9px;
  border-radius: 999px;
  background-color: rgba(47, 111, 126, 0.1);
  color: var(--river);
  margin-bottom: 10px;
}

.channel-tag-brick {
  background-color: rgba(196, 85, 59, 0.1);
  color: var(--brick);
}

.channel-tag-river {
  background-color: rgba(47, 111, 126, 0.1);
  color: var(--river);
}

.channel-tag-route {
  background-color: rgba(212, 138, 47, 0.14);
  color: #a86c1f;
}

/* 记录标签 */
.update-tag,
.timeline-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  white-space: nowrap;
}

.tag-channel {
  background-color: rgba(47, 111, 126, 0.1);
  color: var(--river);
}

.tag-feature {
  background-color: rgba(196, 85, 59, 0.1);
  color: var(--brick);
}

.tag-guide {
  background-color: rgba(93, 122, 74, 0.12);
  color: var(--park);
}

.tag-verify {
  background-color: rgba(212, 138, 47, 0.14);
  color: #a86c1f;
}

/* FAQ 折叠 */
.faq-item {
  background-color: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  margin-bottom: 12px;
  overflow: hidden;
}

.faq-item:last-child {
  margin-bottom: 0;
}

.faq-question {
  list-style: none;
  cursor: pointer;
  padding: 16px 42px 16px 18px;
  font-weight: 600;
  font-size: 0.97rem;
  color: var(--ink);
  position: relative;
  min-height: 48px;
  display: flex;
  align-items: center;
  transition: color 0.18s ease;
}

.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(--muted);
  border-bottom: 2px solid var(--muted);
  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(--brick);
}

.faq-answer {
  padding: 0 18px 18px;
  color: var(--ink-soft);
  font-size: 0.94rem;
  line-height: 1.75;
  border-top: 1px solid var(--line);
  padding-top: 14px;
}

/* 反馈说明面板 */
.feedback-panel {
  background-color: var(--panel);
  border: 1px solid var(--line);
  border-left: 4px solid var(--route);
  border-radius: var(--radius);
  padding: 24px;
  align-self: start;
}

.feedback-title {
  font-size: 1.1rem;
  margin-bottom: 12px;
}

.feedback-desc,
.feedback-intro {
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.75;
}

.feedback-list {
  margin-top: 14px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.feedback-list li {
  position: relative;
  padding-left: 18px;
  font-size: 0.92rem;
  color: var(--ink-soft);
  line-height: 1.7;
}

.feedback-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.6em;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background-color: var(--route);
}

.feedback-steps {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin: 18px 0;
  counter-reset: fb;
}

.feedback-step {
  padding-left: 16px;
  border-left: 2px solid var(--line);
}

.feedback-step-title {
  font-size: 0.98rem;
  margin-bottom: 4px;
}

.feedback-step p {
  font-size: 0.92rem;
  color: var(--ink-soft);
}

.feedback-note {
  font-size: 0.88rem;
  color: var(--muted);
  padding-top: 14px;
  border-top: 1px dashed var(--line);
}

/* 相关入口卡片（内页通用） */
.related-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--gap);
}

.related-card {
  background-color: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px;
  transition: border-color 0.18s ease, transform 0.18s ease;
}

.related-card:hover {
  border-color: var(--river);
  transform: translateY(-2px);
}

.related-title {
  font-size: 1.05rem;
  margin-bottom: 8px;
}

.related-title a {
  color: var(--ink);
}

.related-title a:hover,
.related-title a:focus-visible {
  color: var(--river);
}

.related-text,
.related-desc {
  font-size: 0.92rem;
  color: var(--muted);
  line-height: 1.7;
  margin: 0;
}

/* 内页统一标题区 */
.page-title-inner,
.page-layout .page-title {
  display: grid;
  gap: 32px;
}

.page-title {
  padding: 28px 0 8px;
}

.page-title-inner {
  grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
  align-items: center;
  padding: 28px 0 8px;
}

.page-title-text {
  min-width: 0;
}

.page-eyebrow,
.page-title-eyebrow,
.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.08em;
  color: var(--brick);
  text-transform: uppercase;
  margin: 0 0 12px;
}

.page-summary,
.page-title-summary,
.page-title-lead,
.page-lead {
  color: var(--ink-soft);
  font-size: 1rem;
  line-height: 1.8;
  margin: 0;
  max-width: 60ch;
}

.page-title-figure,
.page-title-media {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--line);
  background-color: var(--panel);
}

.page-title-figure img,
.page-title-media img {
  width: 100%;
  height: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

.figure-caption,
.page-title-caption {
  padding: 10px 14px;
  font-size: 0.8rem;
  color: var(--muted);
  background-color: var(--panel);
  border-top: 1px solid var(--line);
}

/* --------------------------------------------------------------------------
   4. pages · 首页
   -------------------------------------------------------------------------- */

.home-main .hero-map {
  background-color: var(--ink);
  color: #eae5d7;
}

.hero-inner {
  max-width: var(--hero-max);
  margin: 0 auto;
  padding: 56px 32px 60px;
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
  gap: 48px;
  align-items: center;
}

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

.hero-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.1em;
  color: var(--route);
  text-transform: uppercase;
  margin: 0 0 16px;
}

.hero-content h1 {
  color: #f7f3e8;
  margin-bottom: 18px;
  max-width: 22ch;
}

.hero-lead {
  color: #c4c0b2;
  font-size: 1.02rem;
  line-height: 1.8;
  max-width: 52ch;
  margin-bottom: 26px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 34px;
}

.hero-actions .btn-primary {
  background-color: var(--route);
  border-color: var(--route);
  color: #1a1410;
}

.hero-actions .btn-primary:hover,
.hero-actions .btn-primary:focus-visible {
  background-color: #e39b42;
  border-color: #e39b42;
  color: #1a1410;
}

.hero-actions .btn-ghost {
  color: #eae5d7;
  border-color: rgba(234, 229, 215, 0.34);
}

.hero-actions .btn-ghost:hover,
.hero-actions .btn-ghost:focus-visible {
  border-color: var(--route);
  color: var(--route);
}

.hero-facts {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
  padding-top: 24px;
  border-top: 1px solid rgba(234, 229, 215, 0.16);
}

.fact-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}

.fact-num {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--route);
  line-height: 1.1;
}

.fact-label {
  font-size: 0.82rem;
  color: #a9a596;
  line-height: 1.5;
}

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

.hero-figure {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid rgba(234, 229, 215, 0.18);
}

.hero-figure img {
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.hero-figure figcaption {
  padding: 10px 14px;
  font-size: 0.8rem;
  color: #a9a596;
  background-color: rgba(255, 255, 255, 0.04);
  border-top: 1px solid rgba(234, 229, 215, 0.12);
}

.hero-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
  margin-top: 18px;
}

.legend-item {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-size: 0.8rem;
  color: #c4c0b2;
}

.legend-swatch {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 2px;
  flex-shrink: 0;
}

.swatch-ink {
  background-color: #eae5d7;
}

.swatch-brick {
  background-color: var(--brick);
}

.swatch-river {
  background-color: var(--river);
}

.swatch-park {
  background-color: var(--park);
}

.swatch-route {
  background-color: var(--route);
}

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

.hero-route-tip {
  margin: 14px 0 0;
  font-size: 0.82rem;
  color: #a9a596;
  padding-left: 14px;
  border-left: 2px solid var(--route);
}

/* 首页各 section 垂直节奏 */
.channel-index,
.feature-routes,
.guide-checklist,
.verification-flow,
.updates-summary,
.faq-feedback,
.about-preview {
  padding: 64px 0;
}

.channel-index,
.guide-checklist,
.updates-summary {
  background-color: #EFEADC;
}

.feature-routes,
.verification-flow,
.about-preview {
  background-color: var(--paper);
}

.faq-feedback {
  background-color: #EFEADC;
}

/* 频道区域索引 */
.channel-layout {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  gap: var(--gap);
  align-items: start;
}

.channel-legend-panel {
  background-color: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px;
  position: sticky;
  top: 16px;
}

.panel-title {
  font-size: 1rem;
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}

.channel-legend-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.channel-legend-row {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.9rem;
  color: var(--ink-soft);
}

.panel-note {
  margin: 18px 0 0;
  font-size: 0.8rem;
  color: var(--muted);
  line-height: 1.65;
  padding-top: 14px;
  border-top: 1px dashed var(--line);
}

.channel-panel {
  min-width: 0;
  background-color: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 8px 24px;
}

.channel-list {
  display: flex;
  flex-direction: column;
}

.channel-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}

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

.channel-row-head {
  display: flex;
  align-items: center;
  gap: 10px;
}

.channel-name {
  font-size: 1.06rem;
  margin: 0;
}

.channel-desc,
.channel-topic {
  font-size: 0.92rem;
  color: var(--ink-soft);
  line-height: 1.7;
  margin: 0;
}

.channel-scene {
  font-size: 0.86rem;
  color: var(--muted);
  margin: 0;
}

.channel-topic-link {
  font-size: 0.88rem;
  font-weight: 600;
  display: inline-block;
  margin-top: 2px;
}

.channel-more {
  margin: 18px 0 0;
  text-align: right;
  font-size: 0.9rem;
  font-weight: 600;
}

.channel-figure {
  grid-column: 1 / -1;
  margin-top: 8px;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--line);
  background-color: var(--panel);
}

.channel-figure img {
  width: 100%;
  aspect-ratio: 21 / 8;
  object-fit: cover;
}

.channel-figure figcaption {
  padding: 10px 16px;
  font-size: 0.82rem;
  color: var(--muted);
  border-top: 1px solid var(--line);
}

/* 专题路线推荐 */
.route-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--gap);
}

.route-card {
  background-color: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-width: 0;
  transition: border-color 0.18s ease, transform 0.18s ease;
}

.route-card:hover {
  border-color: var(--brick);
  transform: translateY(-2px);
}

.route-title,
.route-name {
  font-size: 1.1rem;
  margin: 0;
}

.route-desc {
  font-size: 0.92rem;
  color: var(--muted);
  line-height: 1.7;
  margin: 0;
}

.route-steps {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin: 4px 0;
  counter-reset: rt;
}

.route-step {
  position: relative;
  padding: 0 0 14px 24px;
  font-size: 0.88rem;
  color: var(--ink-soft);
  line-height: 1.65;
}

.route-step::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background-color: var(--panel);
  border: 2px solid var(--route);
}

.route-step::after {
  content: "";
  position: absolute;
  left: 5px;
  top: 17px;
  bottom: 2px;
  width: 1px;
  background-color: var(--line);
}

.route-step:last-child {
  padding-bottom: 0;
}

.route-step:last-child::after {
  display: none;
}

.route-step--start::before {
  background-color: var(--route);
}

.route-step--end::before {
  background-color: var(--brick);
  border-color: var(--brick);
}

.route-step-label {
  display: block;
}

.route-link {
  margin-top: auto;
  font-size: 0.9rem;
  font-weight: 600;
  align-self: flex-start;
}

.route-label {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--muted);
  letter-spacing: 0.04em;
}

.route-figure {
  margin-top: 28px;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--line);
  background-color: var(--panel);
}

.route-figure img {
  width: 100%;
  aspect-ratio: 21 / 7;
  object-fit: cover;
}

.route-figure figcaption {
  padding: 10px 16px;
  font-size: 0.82rem;
  color: var(--muted);
  border-top: 1px solid var(--line);
}

/* 观看前检查摘要 */
.checklist-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--gap);
}

.checklist-col {
  background-color: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px;
  min-width: 0;
}

.checklist-col-title {
  font-size: 1rem;
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}

.checklist-list,
.checklist-items {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.checklist-item {
  position: relative;
  padding-left: 22px;
  font-size: 0.92rem;
  color: var(--ink-soft);
  line-height: 1.7;
}

.checklist-dot {
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 8px;
  height: 8px;
  border-radius: 2px;
  background-color: var(--park);
}

.checklist-more {
  margin: 24px 0 0;
  font-size: 0.94rem;
  font-weight: 600;
}

/* 入口核验流程 */
.flow-list {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--gap);
  counter-reset: fl;
}

.flow-step {
  background-color: var(--panel);
  border: 1px solid var(--line);
  border-top: 3px solid var(--route);
  border-radius: var(--radius);
  padding: 22px 20px;
  min-width: 0;
}

.flow-num {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--route);
  margin-bottom: 10px;
}

.flow-title {
  font-size: 1rem;
  margin-bottom: 8px;
}

.flow-desc {
  font-size: 0.88rem;
  color: var(--muted);
  line-height: 1.7;
  margin-bottom: 12px;
}

.flow-result {
  display: inline-block;
  font-size: 0.8rem;
  color: var(--park);
  background-color: rgba(93, 122, 74, 0.1);
  padding: 3px 10px;
  border-radius: 999px;
}

.flow-link {
  display: block;
  margin-top: 24px;
  font-size: 0.94rem;
  font-weight: 600;
}

/* 更新记录摘要 */
.update-list {
  display: flex;
  flex-direction: column;
  background-color: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.update-row {
  display: grid;
  grid-template-columns: 108px minmax(0, 1fr) 180px 88px;
  gap: 18px;
  align-items: center;
  padding: 16px 22px;
  border-bottom: 1px solid var(--line);
}

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

.update-desc {
  margin: 0;
  font-size: 0.94rem;
  color: var(--ink-soft);
  line-height: 1.65;
}

.update-scope {
  font-size: 0.82rem;
  color: var(--muted);
  font-family: var(--font-mono);
}

.update-link {
  font-size: 0.88rem;
  font-weight: 600;
  text-align: right;
}

/* 首页问答与反馈 */
.faq-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
  gap: 32px;
  align-items: start;
}

.faq-col {
  min-width: 0;
}

/* 关于本站预告 */
.about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
  gap: 40px;
  align-items: start;
}

.about-col {
  min-width: 0;
}

.about-col h2 {
  margin-bottom: 14px;
}

.about-desc {
  font-size: 0.96rem;
  color: var(--ink-soft);
  line-height: 1.8;
}

.about-link {
  font-weight: 600;
  font-size: 0.94rem;
}

.next-col {
  min-width: 0;
}

.next-title {
  font-size: 1rem;
  margin-bottom: 14px;
}

.next-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.next-item {
  background-color: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: border-color 0.18s ease, transform 0.18s ease;
}

.next-item:hover {
  border-color: var(--river);
  transform: translateX(2px);
}

.next-item a {
  display: block;
  padding: 14px 18px;
  color: var(--ink);
  font-weight: 600;
  font-size: 0.94rem;
}

.next-item a:hover,
.next-item a:focus-visible {
  color: var(--river);
}

/* --------------------------------------------------------------------------
   4.1 pages · 频道总览
   -------------------------------------------------------------------------- */

.channel-legend {
  padding: 24px 0 8px;
}

.channel-legend .section-head {
  margin-bottom: 16px;
}

.legend-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  padding: 16px 18px;
  background-color: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.legend-chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  padding: 0 16px;
  background-color: #f7f4ea;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 0.88rem;
  color: var(--ink-soft);
  transition: border-color 0.18s ease, background-color 0.18s ease;
}

.legend-chip:hover,
.legend-chip:focus-visible {
  border-color: var(--river);
}

.legend-chip[aria-pressed="true"] {
  background-color: var(--ink);
  border-color: var(--ink);
  color: #f3efe4;
}

.legend-dot {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}

.legend-reset {
  min-height: 44px;
  padding: 0 16px;
  margin-left: auto;
  background-color: transparent;
  border: 1px dashed var(--line);
  border-radius: 999px;
  font-size: 0.86rem;
  color: var(--muted);
}

.legend-reset:hover,
.legend-reset:focus-visible {
  border-color: var(--brick);
  color: var(--brick);
}

.channel-panel {
  padding: 24px 0 8px;
}

.channel-panel .channel-list {
  background-color: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 0 24px;
}

.channel-panel .channel-row {
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 20px 0;
}

.channel-row-main {
  display: flex;
  align-items: center;
  gap: 10px;
}

.channel-link {
  font-size: 0.9rem;
  font-weight: 600;
  margin: 0;
}

.cross-links {
  padding: 24px 0 0;
}

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

.cross-card {
  background-color: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px;
  min-width: 0;
  transition: border-color 0.18s ease;
}

.cross-card:hover {
  border-color: var(--river);
}

.cross-title {
  font-size: 1.02rem;
  margin-bottom: 8px;
}

.cross-desc {
  font-size: 0.9rem;
  color: var(--muted);
  line-height: 1.7;
  margin-bottom: 12px;
}

.cross-link {
  font-size: 0.9rem;
  font-weight: 600;
  margin: 0;
}

/* --------------------------------------------------------------------------
   4.2 pages · 专题片单
   -------------------------------------------------------------------------- */

.route-map {
  padding: 32px 0 8px;
}

.route-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.05em;
  padding: 3px 10px;
  border-radius: 999px;
  margin-bottom: 12px;
  align-self: flex-start;
}

.route-tag--earth {
  background-color: rgba(196, 85, 59, 0.12);
  color: var(--brick);
}

.route-tag--river {
  background-color: rgba(47, 111, 126, 0.12);
  color: var(--river);
}

.route-tag--park {
  background-color: rgba(93, 122, 74, 0.14);
  color: var(--park);
}

.selection-list {
  padding: 40px 0 8px;
}

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

.selection-card {
  background-color: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: border-color 0.18s ease, transform 0.18s ease;
}

.selection-card:hover {
  border-color: var(--river);
  transform: translateY(-2px);
}

.selection-card-head {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.selection-name {
  font-size: 1.06rem;
  margin: 0;
}

.selection-channel {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--muted);
  margin-left: auto;
}

.selection-desc {
  font-size: 0.92rem;
  color: var(--ink-soft);
  line-height: 1.75;
  margin: 0;
}

.selection-meta {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin: 0;
  padding: 12px 0;
  border-top: 1px dashed var(--line);
  border-bottom: 1px dashed var(--line);
}

.selection-meta-row {
  display: grid;
  grid-template-columns: 84px minmax(0, 1fr);
  gap: 12px;
  font-size: 0.86rem;
}

.selection-meta-row dt {
  color: var(--muted);
}

.selection-meta-row dd {
  margin: 0;
  color: var(--ink-soft);
}

.selection-links {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: auto;
}

.selection-links a {
  font-size: 0.88rem;
  font-weight: 600;
}

.channel-links {
  padding: 40px 0 8px;
}

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

.channel-link-card {
  background-color: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px;
  min-width: 0;
}

.channel-link-name {
  font-size: 1rem;
  margin-bottom: 6px;
}

.channel-link-desc {
  font-size: 0.88rem;
  color: var(--muted);
  line-height: 1.7;
  margin: 0;
}

.guide-link {
  padding: 32px 0 8px;
}

.guide-link-panel {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  background-color: var(--ink);
  color: #eae5d7;
  border-radius: var(--radius);
  padding: 28px 32px;
}

.guide-link-desc {
  margin: 0;
  font-size: 0.98rem;
  line-height: 1.75;
  color: #c4c0b2;
  max-width: 62ch;
  flex: 1 1 320px;
}

.guide-link-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 22px;
  background-color: var(--route);
  color: #1a1410;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.94rem;
}

.guide-link-cta:hover,
.guide-link-cta:focus-visible {
  background-color: #e39b42;
  color: #1a1410;
}

.related-links-item {
  font-size: 0.9rem;
  color: var(--muted);
}

.related-links-label {
  font-weight: 600;
  color: var(--ink);
  margin-right: 6px;
}

/* --------------------------------------------------------------------------
   4.3 pages · 观看指南
   -------------------------------------------------------------------------- */

.steps-overview {
  padding: 32px 0 8px;
}

.steps-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.step-item {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  gap: 20px;
  background-color: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px 24px;
  min-width: 0;
}

.step-index {
  font-family: var(--font-mono);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--route);
  line-height: 1.2;
}

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

.step-title {
  font-size: 1.06rem;
  margin-bottom: 8px;
}

.step-text {
  font-size: 0.94rem;
  color: var(--ink-soft);
  line-height: 1.75;
  margin-bottom: 10px;
}

.step-check {
  font-size: 0.86rem;
  color: var(--muted);
  margin: 0;
  padding-top: 10px;
  border-top: 1px dashed var(--line);
}

.step-check-label {
  font-family: var(--font-mono);
  color: var(--park);
  margin-right: 6px;
}

.checklist {
  padding: 40px 0 8px;
}

.checklist .checklist-col {
  padding: 22px;
}

.checklist-label {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  cursor: pointer;
  font-size: 0.92rem;
  color: var(--ink-soft);
  line-height: 1.7;
  min-height: 44px;
  padding: 4px 0;
}

.checklist-input {
  width: 18px;
  height: 18px;
  margin: 2px 0 0;
  accent-color: var(--park);
  flex-shrink: 0;
}

.checklist-text {
  min-width: 0;
}

.checklist-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-top: 24px;
  padding: 16px 20px;
  background-color: var(--panel);
  border: 1px dashed var(--line);
  border-radius: var(--radius);
}

.checklist-status {
  margin: 0;
  font-size: 0.9rem;
  color: var(--muted);
}

.faq-feedback .faq-list {
  display: flex;
  flex-direction: column;
}

/* --------------------------------------------------------------------------
   4.4 pages · 入口核验
   -------------------------------------------------------------------------- */

.verification-steps {
  padding: 32px 0 8px;
}

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

.step-track .step-item {
  display: block;
  border-top: 3px solid var(--route);
  padding: 20px;
}

.step-track .step-index {
  display: inline-block;
  font-size: 0.82rem;
  margin-bottom: 10px;
}

.step-desc {
  font-size: 0.88rem;
  color: var(--muted);
  line-height: 1.7;
  margin-bottom: 10px;
}

.step-result {
  margin: 0;
  font-size: 0.82rem;
  color: var(--park);
  background-color: rgba(93, 122, 74, 0.1);
  padding: 3px 10px;
  border-radius: 999px;
  display: inline-block;
}

.status-table {
  padding: 40px 0 8px;
}

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

.status-grid {
  min-width: 620px;
}

.status-grid thead th {
  background-color: #f0ece0;
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 0.86rem;
  font-weight: 600;
  text-align: left;
  padding: 14px 18px;
  border-bottom: 1px solid var(--line);
  white-space: nowrap;
}

.status-grid tbody td {
  padding: 14px 18px;
  font-size: 0.9rem;
  color: var(--ink-soft);
  line-height: 1.7;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

.status-grid tbody tr:last-child td {
  border-bottom: none;
}

.status-grid tbody tr:nth-child(even) {
  background-color: #faf8f1;
}

.status-grid tbody td:first-child {
  font-weight: 600;
  color: var(--ink);
}

.abnormal-note {
  padding: 40px 0 8px;
}

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

.note-col {
  background-color: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px;
  min-width: 0;
}

.note-col h3 {
  font-size: 1.02rem;
  margin-bottom: 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}

.note-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.note-list li {
  position: relative;
  padding-left: 18px;
  font-size: 0.92rem;
  color: var(--ink-soft);
  line-height: 1.7;
}

.note-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.65em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--route);
}

.related-links {
  padding: 40px 0 8px;
}

/* --------------------------------------------------------------------------
   4.5 pages · 更新记录
   -------------------------------------------------------------------------- */

.update-timeline {
  padding: 32px 0 8px;
}

.timeline-list {
  display: flex;
  flex-direction: column;
  border-left: 2px solid var(--line);
  margin-left: 8px;
  padding-left: 0;
}

.timeline-item {
  display: grid;
  grid-template-columns: 172px minmax(0, 1fr);
  gap: 24px;
  padding: 0 0 24px 26px;
  position: relative;
}

.timeline-item::before {
  content: "";
  position: absolute;
  left: -8px;
  top: 6px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background-color: var(--panel);
  border: 3px solid var(--route);
}

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

.timeline-meta {
  display: flex;
  flex-direction: column;
  gap: 6px;
  align-items: flex-start;
}

.timeline-date {
  font-family: var(--font-mono);
  font-size: 0.84rem;
  color: var(--ink);
  font-weight: 600;
}

.timeline-body {
  min-width: 0;
  background-color: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 22px;
}

.timeline-title {
  font-size: 1.02rem;
  margin-bottom: 8px;
}

.timeline-body p {
  font-size: 0.9rem;
  color: var(--muted);
  line-height: 1.7;
  margin-bottom: 10px;
}

.inline-link {
  font-size: 0.88rem;
  font-weight: 600;
}

.impact-notes {
  padding: 40px 0 8px;
}

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

.impact-card {
  background-color: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.impact-badge {
  align-self: flex-start;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.05em;
  padding: 3px 10px;
  border-radius: 999px;
  background-color: rgba(47, 111, 126, 0.1);
  color: var(--river);
}

.impact-title {
  font-size: 1.02rem;
  margin: 0;
}

.impact-desc {
  font-size: 0.9rem;
  color: var(--ink-soft);
  line-height: 1.7;
  margin: 0;
}

.impact-scope {
  font-size: 0.84rem;
  color: var(--muted);
  font-family: var(--font-mono);
  margin: 0;
}

.impact-card .inline-link {
  margin-top: auto;
}

.revision-scope {
  padding: 40px 0 8px;
}

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

.scope-col {
  background-color: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px;
  min-width: 0;
}

.scope-title {
  font-size: 1.02rem;
  margin-bottom: 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}

.scope-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.scope-list li {
  position: relative;
  padding-left: 18px;
  font-size: 0.92rem;
  color: var(--ink-soft);
  line-height: 1.7;
}

.scope-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.65em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--river);
}

.scope-note {
  margin: 16px 0 0;
  padding-top: 14px;
  border-top: 1px dashed var(--line);
  font-size: 0.86rem;
  color: var(--muted);
}

.scope-links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 12px;
}

/* --------------------------------------------------------------------------
   4.6 pages · 关于本站
   -------------------------------------------------------------------------- */

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

.page-layout.about-layout {
  display: block;
  padding-bottom: 8px;
}

.page-about .page-title {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
  gap: 32px;
  align-items: center;
  padding: 28px 0 8px;
}

.about-intro {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
  gap: 32px;
  align-items: start;
  padding: 40px 0 8px;
}

.about-intro-text {
  min-width: 0;
}

.about-intro-text h2 {
  margin-bottom: 14px;
}

.about-intro-text p {
  font-size: 0.96rem;
  color: var(--ink-soft);
  line-height: 1.8;
}

.about-facts {
  background-color: var(--panel);
  border: 1px solid var(--line);
  border-left: 4px solid var(--river);
  border-radius: var(--radius);
  padding: 22px;
  min-width: 0;
}

.facts-title {
  font-size: 1rem;
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}

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

.about-facts .fact-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding-bottom: 12px;
  border-bottom: 1px dashed var(--line);
}

.about-facts .fact-item:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.about-facts .fact-label {
  font-size: 0.8rem;
  color: var(--muted);
}

.fact-value {
  font-size: 0.94rem;
  color: var(--ink);
  font-weight: 600;
  line-height: 1.6;
}

.organization-principles {
  padding: 40px 0 8px;
}

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

.principle-card {
  background-color: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px;
  min-width: 0;
}

.principle-index {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--brick);
  margin-bottom: 10px;
}

.principle-card h3 {
  font-size: 1.02rem;
  margin-bottom: 8px;
}

.principle-card p {
  font-size: 0.9rem;
  color: var(--muted);
  line-height: 1.7;
  margin: 0;
}

.boundary-list {
  padding: 40px 0 8px;
}

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

.boundary-item {
  background-color: var(--panel);
  border: 1px solid var(--line);
  border-left: 4px solid var(--brick);
  border-radius: var(--radius);
  padding: 22px;
  min-width: 0;
}

.boundary-item h3 {
  font-size: 1rem;
  margin-bottom: 8px;
}

.boundary-item p {
  font-size: 0.9rem;
  color: var(--muted);
  line-height: 1.7;
  margin: 0;
}

.help-paths {
  padding: 40px 0 8px;
}

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

.help-card {
  background-color: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px;
  min-width: 0;
  transition: border-color 0.18s ease, transform 0.18s ease;
}

.help-card:hover {
  border-color: var(--river);
  transform: translateY(-2px);
}

.help-card h3 {
  font-size: 1rem;
  margin-bottom: 6px;
}

.help-card h3 a {
  color: var(--ink);
}

.help-card h3 a:hover,
.help-card h3 a:focus-visible {
  color: var(--river);
}

.help-card p {
  font-size: 0.88rem;
  color: var(--muted);
  line-height: 1.7;
  margin: 0;
}

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

.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 64px 32px 96px;
}

.error-panel {
  max-width: 640px;
  width: 100%;
  background-color: var(--panel);
  border: 1px solid var(--line);
  border-top: 4px solid var(--brick);
  border-radius: var(--radius);
  padding: 40px;
  text-align: left;
}

.error-code {
  font-family: var(--font-mono);
  font-size: 0.84rem;
  letter-spacing: 0.1em;
  color: var(--brick);
  margin: 0 0 12px;
}

.error-title {
  font-size: clamp(1.6rem, 3.4vw, 2.2rem);
  margin-bottom: 14px;
}

.error-text {
  font-size: 0.96rem;
  color: var(--ink-soft);
  line-height: 1.8;
  margin-bottom: 22px;
}

.error-paths {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-bottom: 22px;
}

.error-paths li {
  min-width: 0;
}

.error-paths a {
  display: flex;
  align-items: center;
  min-height: 44px;
  padding: 0 16px;
  background-color: #f7f4ea;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--ink);
}

.error-paths a:hover,
.error-paths a:focus-visible {
  border-color: var(--river);
  color: var(--river);
}

.error-note {
  font-size: 0.86rem;
  color: var(--muted);
  margin-bottom: 18px;
}

.error-home {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 22px;
  background-color: var(--brick);
  color: #fff;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.94rem;
}

.error-home:hover,
.error-home:focus-visible {
  background-color: #a8452e;
  color: #fff;
}

/* --------------------------------------------------------------------------
   5. responsive
   -------------------------------------------------------------------------- */

@media (max-width: 960px) {
  .utility-inner,
  .brand-inner,
  .section-inner,
  .inner-main,
  .footer-inner,
  .footer-bottom {
    padding-left: 24px;
    padding-right: 24px;
  }

  .hero-inner {
    padding: 44px 24px 48px;
    grid-template-columns: minmax(0, 1fr);
    gap: 32px;
  }

  .hero-content h1 {
    max-width: none;
  }

  .nav-toggle {
    display: flex;
  }

  .primary-nav {
    flex-basis: 100%;
    margin-left: 0;
    order: 3;
  }

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

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

  .nav-list > li {
    display: block;
  }

  .nav-link {
    width: 100%;
    padding: 0 12px;
    border-bottom: 1px solid var(--line);
    border-left: 3px solid transparent;
    justify-content: flex-start;
  }

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

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

  .channel-legend-panel {
    position: static;
  }

  .channel-legend-list {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 10px 20px;
  }

  .route-grid,
  .checklist-grid,
  .cross-grid,
  .channel-links-grid,
  .impact-grid,
  .principles-grid,
  .help-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

  .update-row {
    grid-template-columns: 96px minmax(0, 1fr) 96px;
    grid-template-areas:
      "tag desc link"
      "tag scope link";
    row-gap: 6px;
  }

  .update-row .update-tag {
    grid-area: tag;
  }

  .update-row .update-desc {
    grid-area: desc;
  }

  .update-row .update-scope {
    grid-area: scope;
  }

  .update-row .update-link {
    grid-area: link;
    align-self: center;
  }

  .faq-layout,
  .about-layout,
  .about-intro,
  .note-columns,
  .scope-layout,
  .boundary-grid {
    grid-template-columns: minmax(0, 1fr);
  }

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

  .page-title-figure,
  .page-title-media {
    max-width: 560px;
  }

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

  .timeline-item {
    grid-template-columns: 140px minmax(0, 1fr);
    gap: 18px;
  }

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

@media (max-width: 720px) {
  body {
    font-size: 15px;
    line-height: 1.7;
  }

  .utility-inner {
    padding-top: 6px;
    padding-bottom: 6px;
    gap: 10px;
    flex-wrap: wrap;
  }

  .utility-nav {
    gap: 14px;
  }

  .brand-inner {
    padding-top: 12px;
    padding-bottom: 12px;
    gap: 12px;
  }

  .brand-mark {
    font-size: 1.25rem;
  }

  .hero-facts {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
  }

  .channel-index,
  .feature-routes,
  .guide-checklist,
  .verification-flow,
  .updates-summary,
  .faq-feedback,
  .about-preview {
    padding: 44px 0;
  }

  .route-grid,
  .checklist-grid,
  .cross-grid,
  .channel-links-grid,
  .impact-grid,
  .principles-grid,
  .help-grid,
  .flow-list,
  .step-track,
  .related-grid {
    grid-template-columns: minmax(0, 1fr);
  }

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

  .guide-link-panel {
    padding: 22px;
  }

  .step-item {
    grid-template-columns: 44px minmax(0, 1fr);
    gap: 14px;
    padding: 18px 18px;
  }

  .step-track .step-item {
    display: block;
  }

  .timeline-item {
    grid-template-columns: minmax(0, 1fr);
    gap: 8px;
    padding-left: 22px;
  }

  .timeline-meta {
    flex-direction: row;
    align-items: center;
    gap: 10px;
  }

  .timeline-body {
    padding: 16px 18px;
  }

  .update-row {
    grid-template-columns: minmax(0, 1fr);
    grid-template-areas: none;
    gap: 6px;
    padding: 16px 18px;
  }

  .update-row .update-tag,
  .update-row .update-desc,
  .update-row .update-scope,
  .update-row .update-link {
    grid-area: auto;
  }

  .update-row .update-link {
    text-align: left;
  }

  .error-panel {
    padding: 28px 22px;
  }

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

  .error-main {
    padding: 40px 20px 64px;
  }

  .legend-reset {
    margin-left: 0;
  }
}

@media (max-width: 520px) {
  .utility-inner,
  .brand-inner,
  .section-inner,
  .inner-main,
  .footer-inner,
  .footer-bottom {
    padding-left: 18px;
    padding-right: 18px;
  }

  .hero-inner {
    padding: 34px 18px 40px;
  }

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

  .hero-actions .btn {
    width: 100%;
  }

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

  .channel-panel,
  .channel-panel .channel-list {
    padding-left: 16px;
    padding-right: 16px;
  }

  .channel-row {
    padding: 16px 0;
  }

  .selection-meta-row {
    grid-template-columns: minmax(0, 1fr);
    gap: 2px;
  }

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

  .footer-bottom {
    flex-direction: column;
    gap: 6px;
  }

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

  .checklist-actions .btn {
    width: 100%;
  }

  .error-home {
    width: 100%;
  }
}

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

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}