@charset "utf-8";

/* ==========================================================================
   base — 变量、重置、排版基础
   ========================================================================== */

:root {
  --canvas: #FBF8F3;
  --surface: #F3EDE3;
  --ink: #1F2A26;
  --ink-soft: #4A554F;
  --pine: #23453C;
  --pine-deep: #1A342D;
  --brass: #A98B54;
  --brass-soft: #C7B18A;
  --link: #2F6B57;
  --link-hover: #1E5142;
  --line: #E2D7C6;
  --warn: #8A3B2E;

  --font-serif: "Noto Serif SC", "Songti SC", "STSong", Georgia, serif;
  --font-sans: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-num: "Songti SC", "Noto Serif SC", Georgia, serif;

  --shell: 1160px;
  --reading: 760px;
  --radius: 4px;
  --pad-desktop: 40px;
  --pad-tablet: 28px;
  --pad-mobile: 18px;
}

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

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

body {
  margin: 0;
  background: var(--canvas);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.85;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3,
h4 {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--ink);
  line-height: 1.4;
}

p {
  margin: 0 0 1.1em;
}

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

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

figure {
  margin: 0;
}

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

svg {
  display: block;
}

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

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

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

strong {
  font-weight: 600;
  color: var(--ink);
}

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

.skip-link {
  position: absolute;
  left: 12px;
  top: -60px;
  z-index: 90;
  padding: 10px 18px;
  background: var(--pine);
  color: #fff;
  border-radius: var(--radius);
  transition: top 0.2s ease;
}

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

/* ==========================================================================
   layout — 外壳、容器、页头、页脚、通用骨架
   ========================================================================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: rgba(251, 248, 243, 0.98);
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.site-header.is-compact {
  border-bottom-color: var(--line);
}

.header-inner {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 var(--pad-desktop);
  height: 84px;
  display: flex;
  align-items: center;
  gap: 28px;
  transition: height 0.22s ease;
}

.site-header.is-compact .header-inner {
  height: 66px;
}

.brand {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 2px;
  flex: 0 0 auto;
  min-height: 44px;
}

.brand-name {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 600;
  color: var(--pine);
  letter-spacing: 0.02em;
  line-height: 1.2;
}

.brand-slogan {
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--brass);
  line-height: 1.3;
}

.site-nav {
  flex: 1 1 auto;
  min-width: 0;
}

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

.nav-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 14px;
  font-size: 15px;
  color: var(--ink);
  border-bottom: 2px solid transparent;
  white-space: nowrap;
}

.nav-link:hover {
  color: var(--pine);
  border-bottom-color: var(--brass-soft);
}

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

.header-feedback {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 0 16px;
  font-size: 14px;
  color: var(--pine);
  border: 1px solid var(--brass-soft);
  border-radius: var(--radius);
  white-space: nowrap;
}

.header-feedback:hover {
  background: var(--surface);
  border-color: var(--brass);
  color: var(--pine-deep);
}

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

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

.mobile-nav {
  display: none;
  border-top: 1px solid var(--line);
  background: var(--canvas);
  max-height: calc(100vh - 66px);
  overflow-y: auto;
}

.mobile-nav.is-open {
  display: block;
}

.mobile-nav-list {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 8px var(--pad-mobile) 20px;
}

.mobile-nav-row {
  display: flex;
  align-items: stretch;
  border-bottom: 1px solid var(--line);
}

.mobile-nav-link {
  flex: 1 1 auto;
  display: flex;
  align-items: center;
  min-height: 48px;
  padding: 0 4px;
  font-size: 16px;
  color: var(--ink);
}

.mobile-nav-link.is-current {
  color: var(--pine);
  font-weight: 600;
}

.mobile-nav-arrow {
  flex: 0 0 auto;
  width: 48px;
  min-height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--brass);
}

.mobile-nav-arrow::before {
  content: "";
  width: 8px;
  height: 8px;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  transform: rotate(45deg) translate(-2px, -2px);
  transition: transform 0.2s ease;
}

.mobile-nav-arrow[aria-expanded="true"]::before {
  transform: rotate(-135deg) translate(-2px, -2px);
}

.mobile-subnav {
  padding: 4px 0 8px 16px;
  border-bottom: 1px solid var(--line);
}

.mobile-subnav a {
  display: flex;
  align-items: center;
  min-height: 44px;
  font-size: 15px;
  color: var(--ink-soft);
}

.mobile-subnav a:hover {
  color: var(--pine);
}

.site-main {
  display: block;
}

.inner-main {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 var(--pad-desktop) 72px;
}

.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  padding: 22px 0 6px;
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--ink-soft);
}

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

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

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

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

.page-header {
  padding: 4px 0 0;
}

.page-title {
  font-family: var(--font-serif);
  font-size: clamp(28px, 3.4vw, 40px);
  font-weight: 600;
  line-height: 1.32;
  color: var(--ink);
  letter-spacing: 0.01em;
}

.page-head {
  padding: 14px 0 0;
}

.page-lead {
  max-width: var(--reading);
  font-size: 16px;
  color: var(--ink-soft);
  line-height: 1.85;
}

.rule-line {
  display: block;
  width: 100%;
  height: 1px;
  margin-top: 22px;
  background: var(--brass-soft);
  border: 0;
}

.title-rule {
  display: block;
  width: 32px;
  height: 1px;
  margin-top: 14px;
  background: var(--brass);
}

.rule-brass {
  width: 100%;
  height: 1px;
  margin: 20px 0 0;
  border: 0;
  background: var(--brass-soft);
}

.page-hero {
  padding: 20px 0 0;
}

.page-hero-inner {
  max-width: var(--reading);
}

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

.section-title {
  font-family: var(--font-serif);
  font-size: clamp(20px, 2.4vw, 24px);
  font-weight: 600;
  line-height: 1.4;
  color: var(--ink);
}

.section-title::after {
  content: "";
  display: block;
  width: 32px;
  height: 1px;
  margin-top: 10px;
  background: var(--brass);
}

.section-lead,
.section-intro,
.section-note {
  margin-top: 12px;
  max-width: var(--reading);
  font-size: 15px;
  color: var(--ink-soft);
  line-height: 1.85;
}

.next-step {
  margin-top: 52px;
  padding: 24px 26px;
  background: var(--surface);
  border-left: 3px solid var(--brass);
  border-radius: var(--radius);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px 24px;
}

.next-step-text {
  margin: 0;
  flex: 1 1 240px;
  font-size: 15px;
  color: var(--ink);
}

.next-step-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 18px;
  font-size: 14px;
  color: #fff;
  background: var(--pine);
  border: 1px solid var(--pine);
  border-radius: var(--radius);
}

.next-step-link:hover {
  background: var(--pine-deep);
  border-color: var(--pine-deep);
  color: #fff;
}

.next-step-link.is-plain {
  background: transparent;
  color: var(--pine);
  border-color: var(--brass-soft);
}

.next-step-link.is-plain:hover {
  background: var(--canvas);
  border-color: var(--brass);
  color: var(--pine-deep);
}

.next-step-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.next-step-links a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 16px;
  font-size: 14px;
  color: var(--pine);
  border: 1px solid var(--brass-soft);
  border-radius: var(--radius);
}

.next-step-links a:hover {
  background: var(--canvas);
  border-color: var(--brass);
  color: var(--pine-deep);
}

.text-link,
.inline-link {
  display: inline-block;
  border-bottom: 1px solid var(--brass-soft);
  padding-bottom: 1px;
  color: var(--link);
}

.text-link:hover,
.inline-link:hover {
  border-bottom-color: var(--link-hover);
  color: var(--link-hover);
}

/* 图片容器通用约束 */
.content-media,
.group-figure,
.collection-media,
.ledger-figure,
.faq-figure,
.page-media,
.media-figure {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--surface);
}

.content-media img,
.group-figure img,
.collection-media img,
.ledger-figure img,
.faq-figure img,
.page-media img,
.media-figure img {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

figcaption,
.hero-caption,
.ledger-figcaption,
.faq-figure-caption,
.media-caption {
  padding: 10px 14px;
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--ink-soft);
  background: var(--surface);
  border-top: 1px solid var(--line);
}

/* 页脚 */
.site-footer {
  margin-top: 72px;
  background: var(--surface);
  border-top: 1px solid var(--line);
}

.footer-inner {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 48px var(--pad-desktop) 0;
  display: grid;
  grid-template-columns: 1.4fr repeat(4, minmax(0, 1fr));
  gap: 32px 28px;
}

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

.footer-brand-name {
  display: block;
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 600;
  color: var(--pine);
  letter-spacing: 0.02em;
}

.footer-brand-desc {
  margin: 10px 0 0;
  font-size: 13px;
  line-height: 1.8;
  color: var(--ink-soft);
}

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

.footer-col-title {
  margin: 0 0 12px;
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--pine);
}

.footer-links li + li {
  margin-top: 2px;
}

.footer-links a {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  font-size: 14px;
  color: var(--ink-soft);
}

.footer-links a:hover {
  color: var(--pine);
}

.footer-bottom {
  max-width: var(--shell);
  margin: 32px auto 0;
  padding: 18px var(--pad-desktop) 26px;
  border-top: 1px solid var(--line);
}

.footer-position {
  margin: 0;
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--ink-soft);
}

/* ==========================================================================
   components — 通用组件
   ========================================================================== */

/* 片目条目列表 */
.entry-list {
  border-top: 1px solid var(--line);
}

.entry-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto auto auto;
  align-items: center;
  gap: 8px 18px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
  transition: border-color 0.18s ease;
}

.entry-row:hover {
  border-bottom-color: var(--brass);
}

.entry-main {
  min-width: 0;
}

.entry-name {
  display: inline-block;
  font-family: var(--font-serif);
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
  line-height: 1.5;
}

.entry-name:hover {
  color: var(--pine);
}

.entry-point {
  margin: 4px 0 0;
  font-size: 13px;
  line-height: 1.7;
  letter-spacing: 0.02em;
  color: var(--ink-soft);
}

.entry-tag {
  display: inline-block;
  padding: 2px 10px;
  font-size: 12px;
  letter-spacing: 0.02em;
  color: var(--pine);
  background: var(--canvas);
  border: 1px solid var(--brass-soft);
  border-radius: var(--radius);
  white-space: nowrap;
}

.entry-length {
  font-family: var(--font-num);
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--ink-soft);
  white-space: nowrap;
}

.entry-link {
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  font-size: 13px;
  color: var(--link);
  border-bottom: 1px solid transparent;
  white-space: nowrap;
}

.entry-link:hover {
  color: var(--link-hover);
  border-bottom-color: var(--brass-soft);
}

.entry-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.entry-scene {
  grid-column: 1 / -1;
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  letter-spacing: 0.02em;
  color: var(--ink-soft);
}

/* 分组标题块 */
.group-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 16px;
  padding-left: 14px;
  border-left: 3px solid var(--line);
  margin-bottom: 18px;
  transition: border-color 0.3s ease;
}

.channel-group.is-active .group-head {
  border-left-color: var(--brass);
}

.group-title {
  font-family: var(--font-serif);
  font-size: clamp(18px, 2vw, 22px);
  font-weight: 600;
  color: var(--ink);
}

.group-desc,
.group-rule {
  flex: 1 1 320px;
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.group-count {
  font-family: var(--font-num);
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--brass);
  white-space: nowrap;
}

/* FAQ 折叠 */
.faq-item {
  border-bottom: 1px solid var(--line);
  background: transparent;
}

.faq-question {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  min-height: 52px;
  padding: 14px 0;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.6;
  color: var(--ink);
  cursor: pointer;
  list-style: none;
}

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

.faq-question::after {
  content: "";
  flex: 0 0 auto;
  width: 9px;
  height: 9px;
  margin-top: 8px;
  border-right: 1.5px solid var(--brass);
  border-bottom: 1.5px solid var(--brass);
  transform: rotate(45deg);
  transition: transform 0.2s ease;
}

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

.faq-answer {
  padding: 0 0 16px;
  font-size: 14px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.faq-answer p {
  margin-bottom: 0.7em;
}

.faq-more {
  margin: 0;
  font-size: 13px;
}

.faq-more a {
  border-bottom: 1px solid var(--brass-soft);
}

/* 线性图标 */
.prep-icon,
.step-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  color: var(--pine);
  border: 1px solid var(--brass-soft);
  border-radius: var(--radius);
  background: var(--canvas);
}

.step-icon svg,
.prep-icon svg {
  width: 24px;
  height: 24px;
  stroke: currentColor;
  stroke-width: 1.5;
  fill: none;
}

/* ==========================================================================
   pages — 首页
   ========================================================================== */

.home-main {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 var(--pad-desktop);
}

/* 首屏作品集区 */
.hero {
  padding: 32px 0 8px;
}

.hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(0, 1fr);
  gap: 40px;
  align-items: start;
}

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

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

.hero-caption {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px 12px;
  background: var(--surface);
  border-top: 1px solid var(--line);
}

.hero-caption-tag {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--pine);
  padding: 2px 8px;
  border: 1px solid var(--brass-soft);
  border-radius: var(--radius);
}

.hero-caption-text {
  font-size: 13px;
  color: var(--ink-soft);
}

.hero-index {
  min-width: 0;
  display: flex;
  flex-direction: column;
}

.hero-title {
  font-size: clamp(30px, 4vw, 46px);
  line-height: 1.28;
  color: var(--ink);
}

.hero-lead {
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.hero-index-list {
  margin-top: 22px;
  border-top: 1px solid var(--line);
}

.hero-index-item {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr) auto;
  align-items: center;
  gap: 10px;
  padding: 11px 0;
  border-bottom: 1px solid var(--line);
}

.hero-index-num {
  font-family: var(--font-num);
  font-size: 14px;
  letter-spacing: 0.04em;
  color: var(--brass);
}

.hero-index-name {
  min-width: 0;
  font-size: 15px;
  color: var(--ink);
  overflow-wrap: break-word;
}

.hero-index-name:hover {
  color: var(--pine);
}

.hero-index-tag {
  font-size: 12px;
  letter-spacing: 0.02em;
  color: var(--ink-soft);
  white-space: nowrap;
}

.hero-note {
  margin: 18px 0 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--ink-soft);
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  align-self: flex-start;
  min-height: 46px;
  margin-top: 20px;
  padding: 0 24px;
  font-size: 15px;
  color: #fff;
  background: var(--pine);
  border: 1px solid var(--pine);
  border-radius: var(--radius);
}

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

.content-media-primary {
  margin-top: 32px;
}

/* 频道锚点条 */
.channel-anchor {
  margin-top: 40px;
}

.channel-anchor-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  padding: 14px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.channel-anchor-link {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 0 18px;
  font-size: 14px;
  color: var(--pine);
  border: 1px solid var(--brass-soft);
  border-radius: var(--radius);
  background: var(--canvas);
}

.channel-anchor-link:hover {
  border-color: var(--brass);
  background: var(--surface);
  color: var(--pine-deep);
}

/* 频道菜单长页 */
.channel-menu {
  margin-top: 56px;
}

.channel-group {
  padding: 26px 0 8px;
}

.channel-group + .channel-group {
  border-top: 1px solid var(--line);
  margin-top: 14px;
}

.channel-menu .entry-row {
  grid-template-columns: minmax(0, 1fr) auto auto auto;
}

/* 主题片单三联 */
.collection-triplet {
  margin-top: 64px;
}

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

.collection-card {
  display: flex;
  flex-direction: column;
  padding: 22px 22px 20px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: border-color 0.18s ease, transform 0.18s ease;
}

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

.collection-name {
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 600;
  color: var(--ink);
}

.collection-logic {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.collection-order {
  margin-top: 16px;
  padding-top: 12px;
  border-top: 1px solid var(--line);
  counter-reset: order;
}

.collection-order li {
  position: relative;
  padding: 5px 0 5px 26px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink);
  counter-increment: order;
}

.collection-order li::before {
  content: counter(order, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 5px;
  font-family: var(--font-num);
  font-size: 12px;
  color: var(--brass);
}

.collection-duration {
  align-self: flex-start;
  margin-top: 16px;
  padding: 2px 10px;
  font-size: 12px;
  letter-spacing: 0.02em;
  color: var(--pine);
  border: 1px solid var(--brass-soft);
  border-radius: var(--radius);
}

.collection-link {
  margin-top: 14px;
  font-size: 13px;
  color: var(--link);
  border-bottom: 1px solid var(--brass-soft);
  align-self: flex-start;
}

.collection-link:hover {
  color: var(--link-hover);
  border-bottom-color: var(--link-hover);
}

/* 分辑摘要 */
.ledger-summary {
  margin-top: 64px;
}

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

.ledger-row {
  display: grid;
  grid-template-columns: 64px minmax(0, 1.1fr) minmax(0, 1fr) auto;
  align-items: center;
  gap: 8px 20px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}

.ledger-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 40px;
  font-family: var(--font-num);
  font-size: 14px;
  letter-spacing: 0.02em;
  color: var(--pine);
  border: 1px solid var(--brass-soft);
  border-radius: var(--radius);
  background: var(--canvas);
}

.ledger-theme {
  min-width: 0;
  font-family: var(--font-serif);
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
}

.ledger-rep {
  min-width: 0;
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-soft);
}

.ledger-count {
  font-family: var(--font-num);
  font-size: 13px;
  color: var(--brass);
  white-space: nowrap;
}

.ledger-body {
  grid-column: 2 / -1;
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-soft);
}

.ledger-link {
  font-size: 13px;
  color: var(--link);
  border-bottom: 1px solid var(--brass-soft);
}

.ledger-link:hover {
  color: var(--link-hover);
  border-bottom-color: var(--link-hover);
}

/* 观看前准备 */
.watch-prep {
  margin-top: 64px;
}

.prep-list {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 24px;
  margin-top: 20px;
}

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

.prep-title {
  margin: 12px 0 0;
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
}

.prep-desc {
  margin: 6px 0 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--ink-soft);
}

.prep-more {
  margin-top: 20px;
  font-size: 14px;
}

.prep-more a {
  border-bottom: 1px solid var(--brass-soft);
}

/* 资料类型 */
.material-types {
  margin-top: 64px;
}

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

.material-item {
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

.material-name {
  font-family: var(--font-serif);
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
}

.material-desc {
  margin: 6px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
}

/* 首页问答与纠错引导 */
.home-faq {
  margin-top: 64px;
}

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

.feedback-strip {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 20px;
  margin-top: 36px;
  padding: 20px 24px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-left: 3px solid var(--brass);
  border-radius: var(--radius);
}

.feedback-strip-text {
  flex: 1 1 260px;
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink);
}

.feedback-strip-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 18px;
  font-size: 14px;
  color: var(--pine);
  border: 1px solid var(--brass-soft);
  border-radius: var(--radius);
  background: var(--canvas);
}

.feedback-strip-link:hover {
  border-color: var(--brass);
  color: var(--pine-deep);
}

/* ==========================================================================
   pages — 频道索引
   ========================================================================== */

.section {
  margin-top: 44px;
}

.section-reading {
  margin-top: 32px;
}

.field-legend {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  margin-top: 18px;
  padding: 16px 18px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.field-legend-item {
  min-width: 0;
}

.field-name {
  display: block;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--pine);
}

.field-desc {
  display: block;
  margin-top: 4px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-soft);
}

.page-channel-index .channel-group {
  margin-top: 44px;
}

.group-figure {
  margin-bottom: 20px;
}

.group-figure img {
  aspect-ratio: 21 / 9;
}

.page-channel-index .entry-row {
  grid-template-columns: minmax(0, 1.6fr) auto auto;
  align-items: start;
}

.page-channel-index .entry-scene {
  grid-column: 1 / -1;
}

.section-overlap {
  margin-top: 52px;
}

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

.overlap-item {
  min-width: 0;
  padding: 20px 22px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.overlap-title {
  font-family: var(--font-serif);
  font-size: 16px;
  font-weight: 600;
  color: var(--ink);
}

.overlap-text {
  margin: 8px 0 12px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.overlap-link {
  font-size: 13px;
  color: var(--link);
  border-bottom: 1px solid var(--brass-soft);
}

.overlap-link:hover {
  color: var(--link-hover);
  border-bottom-color: var(--link-hover);
}

/* ==========================================================================
   pages — 主题片单
   ========================================================================== */

.page-layout {
  display: grid;
  gap: 40px;
  margin-top: 8px;
}

.page-themed-collections .page-layout.layout-shell {
  grid-template-columns: minmax(0, 1fr);
}

/* 桌面：aside 先于 main 输出，因此侧栏在左 */
.page-themed-collections .page-layout.sidebar-left {
  grid-template-columns: 240px minmax(0, 1fr);
  align-items: start;
}

.collection-aside {
  min-width: 0;
  padding: 18px 18px 20px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.aside-title {
  font-family: var(--font-serif);
  font-size: 16px;
  font-weight: 600;
  color: var(--ink);
}

.collection-toc {
  margin-top: 12px;
}

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

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

.toc-link {
  display: flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  font-size: 14px;
  color: var(--ink);
}

.toc-link:hover {
  color: var(--pine);
}

.toc-index {
  font-family: var(--font-num);
  font-size: 12px;
  color: var(--brass);
}

.toc-name {
  min-width: 0;
}

.aside-note {
  margin: 14px 0 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--ink-soft);
}

.aside-entry {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  margin-top: 12px;
  font-size: 13px;
  color: var(--link);
  border-bottom: 1px solid var(--brass-soft);
}

.aside-entry:hover {
  color: var(--link-hover);
  border-bottom-color: var(--link-hover);
}

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

.collection-block {
  margin-top: 36px;
  padding-top: 28px;
  border-top: 1px solid var(--line);
}

.collection-block:first-of-type {
  margin-top: 24px;
}

.collection-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 14px;
}

.collection-head h2 {
  font-family: var(--font-serif);
  font-size: clamp(20px, 2.4vw, 24px);
  font-weight: 600;
  color: var(--ink);
}

.duration-tag {
  padding: 2px 10px;
  font-size: 12px;
  letter-spacing: 0.02em;
  color: var(--pine);
  border: 1px solid var(--brass-soft);
  border-radius: var(--radius);
  background: var(--canvas);
}

.collection-media {
  margin-top: 16px;
}

.collection-media img {
  aspect-ratio: 21 / 9;
}

.collection-logic {
  margin-top: 16px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.sequence-list {
  margin-top: 16px;
  border-top: 1px solid var(--line);
}

.sequence-item {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr) auto;
  align-items: start;
  gap: 10px 16px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

.sequence-index {
  font-family: var(--font-num);
  font-size: 14px;
  letter-spacing: 0.04em;
  color: var(--brass);
  padding-top: 2px;
}

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

.sequence-name {
  display: block;
  font-family: var(--font-serif);
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
}

.sequence-reason {
  margin: 4px 0 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--ink-soft);
}

.sequence-link {
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  font-size: 13px;
  color: var(--link);
  white-space: nowrap;
}

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

.usage-tips {
  margin-top: 44px;
  padding-top: 28px;
  border-top: 1px solid var(--line);
}

.usage-tips h2 {
  font-family: var(--font-serif);
  font-size: clamp(20px, 2.4vw, 24px);
  font-weight: 600;
  color: var(--ink);
}

.usage-columns {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
  margin-top: 20px;
}

.usage-col {
  min-width: 0;
  padding: 18px 20px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.usage-col-title {
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 600;
  color: var(--pine);
}

.usage-list {
  margin-top: 10px;
}

.usage-list li {
  position: relative;
  padding: 6px 0 6px 16px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.usage-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 15px;
  width: 6px;
  height: 1px;
  background: var(--brass);
}

.usage-note {
  margin-top: 18px;
  font-size: 13px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.usage-note a {
  border-bottom: 1px solid var(--brass-soft);
  margin-right: 4px;
}

.related-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 18px;
  margin-top: 32px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
}

.related-links-label {
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--brass);
}

.related-links-item {
  font-size: 14px;
  color: var(--link);
  border-bottom: 1px solid var(--brass-soft);
}

.related-links-item:hover {
  color: var(--link-hover);
  border-bottom-color: var(--link-hover);
}

/* ==========================================================================
   pages — 分辑清单
   ========================================================================== */

.page-episode-ledger .ledger-hero {
  padding: 16px 0 0;
}

.page-episode-ledger .ledger-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 44px;
  margin-top: 32px;
}

.ledger-reading,
.ledger-list {
  min-width: 0;
}

.ledger-reading-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 28px;
  align-items: start;
  margin-top: 8px;
}

.ledger-figure {
  min-width: 0;
}

.ledger-figure img {
  aspect-ratio: 4 / 3;
}

.ledger-code {
  min-width: 0;
  padding: 20px 22px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.ledger-code-sample {
  margin: 0;
  font-family: var(--font-num);
  font-size: 20px;
  letter-spacing: 0.06em;
  color: var(--pine);
}

.ledger-code-list {
  margin-top: 14px;
  border-top: 1px solid var(--line);
}

.ledger-code-row {
  display: grid;
  grid-template-columns: 88px minmax(0, 1fr);
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px solid var(--line);
  font-size: 14px;
  line-height: 1.75;
}

.ledger-code-row dt {
  color: var(--pine);
  font-weight: 600;
}

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

.ledger-card {
  padding: 20px 22px;
  background: var(--canvas);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.ledger-card + .ledger-card {
  margin-top: 16px;
}

.ledger-card-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 14px;
}

.ledger-card-title {
  flex: 1 1 180px;
  min-width: 0;
  font-family: var(--font-serif);
  font-size: 17px;
  font-weight: 600;
  color: var(--ink);
}

.ledger-desc {
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.ledger-samples {
  margin-top: 12px;
  border-top: 1px solid var(--line);
}

.ledger-samples li {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 14px;
  padding: 10px 0;
  border-bottom: 1px solid var(--line);
}

.ledger-samples a {
  font-size: 14px;
  color: var(--ink);
}

.ledger-samples a:hover {
  color: var(--pine);
}

.ledger-sample-tag {
  font-size: 12px;
  letter-spacing: 0.02em;
  color: var(--ink-soft);
  padding: 2px 10px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.ledger-caliber {
  margin-top: 44px;
  padding-top: 28px;
  border-top: 1px solid var(--line);
}

.caliber-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
  margin-top: 8px;
}

.caliber-col {
  min-width: 0;
  padding: 18px 20px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.caliber-col-title {
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 600;
  color: var(--pine);
}

.caliber-col p {
  margin: 10px 0 12px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
}

/* ==========================================================================
   pages — 观看说明
   ========================================================================== */

.page-title-block {
  padding: 4px 0 0;
}

.page-lede {
  max-width: var(--reading);
  margin: 0 0 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.content-media-inline {
  margin-top: 22px;
}

.content-media-inline img {
  aspect-ratio: 21 / 9;
}

.page-watch-notes .page-layout.layout-main-aside {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 40px;
  align-items: start;
  margin-top: 8px;
}

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

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

.aside-block {
  padding: 20px 22px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.aside-block + .aside-block {
  margin-top: 20px;
}

.aside-intro {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.watch-steps {
  margin-top: 32px;
}

.step-item {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 16px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
}

.step-item:first-of-type {
  border-top: 1px solid var(--line);
}

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

.step-title {
  font-family: var(--font-sans);
  font-size: 16px;
  font-weight: 600;
  color: var(--ink);
}

.step-standard {
  margin: 6px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.step-action {
  margin: 8px 0 0;
  padding-left: 12px;
  border-left: 2px solid var(--brass-soft);
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink);
}

.troubleshoot {
  margin-top: 44px;
}

.troubleshoot-list {
  margin-top: 16px;
  padding-left: 0;
  counter-reset: trouble;
}

.troubleshoot-item {
  position: relative;
  padding: 16px 0 16px 40px;
  border-bottom: 1px solid var(--line);
  counter-increment: trouble;
}

.troubleshoot-item::before {
  content: counter(trouble, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 18px;
  font-family: var(--font-num);
  font-size: 14px;
  letter-spacing: 0.04em;
  color: var(--brass);
}

.troubleshoot-title {
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
}

.troubleshoot-text {
  margin: 6px 0 8px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.content-aside .material-list {
  margin-top: 14px;
}

.content-aside .material-item {
  padding: 12px 0;
}

.content-aside .material-name {
  font-size: 14px;
}

.content-aside .material-desc {
  font-size: 13px;
}

.aside-link-list {
  margin-top: 12px;
  border-top: 1px solid var(--line);
}

.aside-link-item {
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
}

.aside-link-item a {
  font-size: 14px;
  color: var(--link);
}

.aside-link-item a:hover {
  color: var(--link-hover);
}

.aside-link-desc {
  margin: 4px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-soft);
}

/* ==========================================================================
   pages — 常见问答
   ========================================================================== */

.faq-figure {
  margin-top: 24px;
}

.faq-figure img {
  aspect-ratio: 21 / 9;
}

.faq-section {
  margin-top: 44px;
}

.faq-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 32px;
  border-top: 1px solid var(--line);
}

/* ==========================================================================
   pages — 纠错与建议
   ========================================================================== */

.page-media {
  margin-top: 24px;
}

.page-media img {
  aspect-ratio: 21 / 9;
}

.content-section {
  margin-top: 44px;
}

.content-section h2 {
  font-family: var(--font-serif);
  font-size: clamp(20px, 2.4vw, 24px);
  font-weight: 600;
  color: var(--ink);
}

.feedback-type-list {
  margin-top: 16px;
  border-top: 1px solid var(--line);
}

.feedback-type-item {
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}

.feedback-type-name {
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 600;
  color: var(--pine);
}

.feedback-type-standard {
  margin: 6px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink);
}

.feedback-type-example {
  margin: 6px 0 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--ink-soft);
}

.feedback-info-list {
  margin-top: 16px;
  padding-left: 0;
  counter-reset: info;
}

.feedback-info-item {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
  counter-increment: info;
}

.feedback-info-index {
  font-family: var(--font-num);
  font-size: 14px;
  letter-spacing: 0.04em;
  color: var(--brass);
}

.feedback-info-index::before {
  content: counter(info, decimal-leading-zero);
}

.feedback-info-text {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.process-list {
  margin-top: 16px;
  padding-left: 0;
  counter-reset: process;
}

.process-step {
  position: relative;
  padding: 18px 0 18px 44px;
  border-bottom: 1px solid var(--line);
  counter-increment: process;
}

.process-step::before {
  content: counter(process, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 20px;
  font-family: var(--font-num);
  font-size: 15px;
  letter-spacing: 0.04em;
  color: var(--brass);
}

.process-step-title {
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
}

.process-step-text {
  margin: 6px 0 8px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.feedback-note {
  margin-top: 44px;
  padding: 20px 24px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-left: 3px solid var(--brass);
  border-radius: var(--radius);
}

.feedback-note h2 {
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 600;
  color: var(--ink);
}

.feedback-note-text {
  margin: 10px 0 12px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
}

/* ==========================================================================
   pages — 内容边界
   ========================================================================== */

.page-boundaries .page-layout.single-column {
  display: block;
}

.page-boundaries .content-section .section-head {
  margin-bottom: 14px;
}

.section-body {
  max-width: var(--reading);
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.compare-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
  margin-top: 20px;
}

.compare-col {
  min-width: 0;
  padding: 20px 22px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.compare-do {
  border-left: 3px solid var(--pine);
}

.compare-dont {
  border-left: 3px solid var(--warn);
}

.compare-title {
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 600;
  color: var(--pine);
}

.compare-dont .compare-title {
  color: var(--warn);
}

.compare-list {
  margin-top: 12px;
}

.compare-list li {
  position: relative;
  padding: 6px 0 6px 16px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.compare-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 15px;
  width: 6px;
  height: 1px;
  background: var(--brass);
}

.media-figure {
  margin-top: 24px;
}

.media-figure img {
  aspect-ratio: 21 / 9;
}

.caliber-list {
  margin-top: 16px;
  border-top: 1px solid var(--line);
}

.caliber-item {
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

.caliber-name {
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
}

.caliber-desc {
  margin: 6px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.exclude-list {
  margin-top: 16px;
  border-top: 1px solid var(--line);
}

.exclude-item {
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

.exclude-name {
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 600;
  color: var(--warn);
}

.exclude-desc {
  margin: 6px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
}

/* ==========================================================================
   pages — 404
   ========================================================================== */

.error-main {
  display: block;
}

.error-inner {
  max-width: 760px;
  margin: 0 auto;
  padding: 72px var(--pad-desktop) 96px;
}

.error-code {
  margin: 0;
  font-family: var(--font-num);
  font-size: 56px;
  line-height: 1;
  letter-spacing: 0.06em;
  color: var(--brass);
}

.error-title {
  margin-top: 16px;
  font-family: var(--font-serif);
  font-size: clamp(26px, 3.2vw, 36px);
  font-weight: 600;
  color: var(--ink);
}

.error-lead {
  margin-top: 16px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.error-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 24px;
  font-size: 15px;
  border-radius: var(--radius);
  border: 1px solid var(--pine);
}

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

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

.btn-ghost {
  color: var(--pine);
  background: transparent;
  border-color: var(--brass-soft);
}

.btn-ghost:hover {
  background: var(--surface);
  border-color: var(--brass);
  color: var(--pine-deep);
}

.error-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  margin-top: 36px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
}

.error-links a {
  font-size: 14px;
  color: var(--link);
  border-bottom: 1px solid var(--brass-soft);
}

.error-links a:hover {
  color: var(--link-hover);
  border-bottom-color: var(--link-hover);
}

/* ==========================================================================
   responsive — 960px 断点
   ========================================================================== */

@media (max-width: 960px) {
  .header-inner {
    height: 70px;
    padding: 0 var(--pad-tablet);
    gap: 16px;
  }

  .site-header.is-compact .header-inner {
    height: 62px;
  }

  .site-nav,
  .header-feedback {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }

  .mobile-nav.is-open {
    display: block;
  }

  .inner-main,
  .home-main {
    padding-left: var(--pad-tablet);
    padding-right: var(--pad-tablet);
  }

  .footer-inner {
    padding: 40px var(--pad-tablet) 0;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 28px 24px;
  }

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

  .footer-bottom {
    padding: 16px var(--pad-tablet) 24px;
  }

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

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

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

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

  /* 主题片单：平板收为单栏，主内容先于侧栏 */
  .page-themed-collections .page-layout.sidebar-left {
    grid-template-columns: minmax(0, 1fr);
    gap: 28px;
  }

  .page-themed-collections .page-content {
    order: 1;
  }

  .page-themed-collections .collection-aside {
    order: 2;
    padding: 16px 18px;
  }

  .toc-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    border-top: 0;
  }

  .toc-item {
    border-bottom: 0;
  }

  .toc-link {
    min-height: 40px;
    padding: 0 14px;
    border: 1px solid var(--brass-soft);
    border-radius: var(--radius);
    background: var(--canvas);
    font-size: 13px;
  }

  .page-watch-notes .page-layout.layout-main-aside {
    grid-template-columns: minmax(0, 1fr);
    gap: 28px;
  }

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

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

  .ledger-rep {
    grid-column: 2 / -1;
  }

  .ledger-body {
    grid-column: 2 / -1;
  }

  .channel-menu .entry-row,
  .page-channel-index .entry-row {
    grid-template-columns: minmax(0, 1fr) auto;
  }

  .page-channel-index .entry-meta {
    grid-column: 1 / -1;
  }
}

/* ==========================================================================
   responsive — 640px 断点
   ========================================================================== */

@media (max-width: 640px) {
  body {
    font-size: 15px;
  }

  .header-inner {
    height: 62px;
    padding: 0 var(--pad-mobile);
  }

  .site-header.is-compact .header-inner {
    height: 58px;
  }

  .brand-name {
    font-size: 18px;
  }

  .brand-slogan {
    font-size: 10px;
  }

  .inner-main,
  .home-main {
    padding-left: var(--pad-mobile);
    padding-right: var(--pad-mobile);
  }

  .inner-main {
    padding-bottom: 48px;
  }

  .breadcrumb {
    padding: 16px 0 4px;
    font-size: 12px;
  }

  .page-title {
    font-size: clamp(24px, 6.4vw, 30px);
  }

  .page-lead,
  .page-lede {
    font-size: 15px;
  }

  .site-footer {
    margin-top: 48px;
  }

  .footer-inner {
    padding: 32px var(--pad-mobile) 0;
    grid-template-columns: minmax(0, 1fr);
    gap: 24px;
  }

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

  .footer-bottom {
    margin-top: 24px;
    padding: 16px var(--pad-mobile) 22px;
  }

  .footer-links a {
    min-height: 40px;
  }

  .hero {
    padding-top: 20px;
  }

  .hero-title {
    font-size: clamp(26px, 7.2vw, 32px);
  }

  .hero-index-item {
    grid-template-columns: 28px minmax(0, 1fr);
    gap: 8px;
  }

  .hero-index-tag {
    grid-column: 2;
    font-size: 12px;
    color: var(--brass);
  }

  .btn-primary {
    align-self: stretch;
    justify-content: center;
  }

  .channel-anchor {
    margin-top: 28px;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  .channel-anchor-list {
    flex-wrap: nowrap;
    gap: 8px;
    padding: 12px 0;
  }

  .channel-anchor-link {
    flex: 0 0 auto;
    min-height: 44px;
    padding: 0 14px;
    font-size: 13px;
  }

  .channel-menu {
    margin-top: 36px;
  }

  .channel-group {
    padding-top: 20px;
  }

  .group-head {
    flex-direction: column;
    gap: 6px;
    padding-left: 12px;
  }

  .group-desc,
  .group-rule {
    flex: 1 1 auto;
  }

  .channel-menu .entry-row,
  .page-channel-index .entry-row {
    grid-template-columns: minmax(0, 1fr);
    gap: 6px;
    padding: 14px 0;
  }

  .channel-menu .entry-tag,
  .channel-menu .entry-length,
  .channel-menu .entry-link,
  .page-channel-index .entry-meta,
  .page-channel-index .entry-link {
    justify-self: start;
  }

  .entry-link {
    min-height: 40px;
  }

  .collection-triplet,
  .ledger-summary,
  .watch-prep,
  .material-types,
  .home-faq {
    margin-top: 40px;
  }

  .collection-cards {
    grid-template-columns: minmax(0, 1fr);
    gap: 16px;
  }

  .ledger-row {
    grid-template-columns: 56px minmax(0, 1fr);
    gap: 6px 12px;
    padding: 14px 0;
  }

  .ledger-rep,
  .ledger-body,
  .ledger-link {
    grid-column: 2;
  }

  .ledger-badge {
    width: 48px;
    height: 36px;
    font-size: 13px;
  }

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

  .feedback-strip {
    padding: 18px;
  }

  .feedback-strip-link {
    justify-content: center;
    width: 100%;
  }

  .section {
    margin-top: 32px;
  }

  .field-legend {
    grid-template-columns: minmax(0, 1fr);
    gap: 10px;
    padding: 14px;
  }

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

  .overlap-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 16px;
  }

  .page-layout {
    gap: 24px;
  }

  /* 主题片单：手机端主内容在前，目录条在后 */
  .page-themed-collections .page-layout.sidebar-left {
    gap: 24px;
  }

  .page-themed-collections .collection-aside {
    padding: 14px 16px;
  }

  .toc-list {
    gap: 6px;
  }

  .toc-link {
    min-height: 40px;
    padding: 0 12px;
    font-size: 13px;
  }

  .collection-head {
    gap: 8px;
  }

  .collection-media img {
    aspect-ratio: 16 / 9;
  }

  .sequence-item {
    grid-template-columns: 32px minmax(0, 1fr);
    gap: 8px 12px;
  }

  .sequence-link {
    grid-column: 2;
    min-height: 40px;
  }

  .usage-columns {
    grid-template-columns: minmax(0, 1fr);
    gap: 16px;
  }

  .page-episode-ledger .ledger-layout {
    gap: 32px;
    margin-top: 20px;
  }

  .ledger-code {
    padding: 16px 18px;
  }

  .ledger-code-sample {
    font-size: 18px;
  }

  .ledger-code-row {
    grid-template-columns: minmax(0, 1fr);
    gap: 2px;
    padding: 8px 0;
  }

  .ledger-card {
    padding: 16px 18px;
  }

  .caliber-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 16px;
  }

  .content-media-inline img,
  .faq-figure img,
  .page-media img,
  .media-figure img {
    aspect-ratio: 16 / 9;
  }

  .page-watch-notes .page-layout.layout-main-aside {
    gap: 24px;
  }

  .step-item {
    grid-template-columns: 40px minmax(0, 1fr);
    gap: 12px;
    padding: 16px 0;
  }

  .step-icon {
    width: 40px;
    height: 40px;
  }

  .troubleshoot-item {
    padding-left: 32px;
  }

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

  .faq-section {
    margin-top: 32px;
  }

  .feedback-info-item {
    grid-template-columns: 32px minmax(0, 1fr);
    gap: 10px;
  }

  .process-step {
    padding-left: 36px;
  }

  .feedback-note {
    margin-top: 32px;
    padding: 18px;
  }

  .compare-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 16px;
  }

  .next-step {
    margin-top: 36px;
    padding: 18px;
    gap: 12px;
  }

  .next-step-link {
    justify-content: center;
    width: 100%;
  }

  .next-step-links {
    width: 100%;
  }

  .next-step-links a {
    flex: 1 1 100%;
    justify-content: center;
  }

  .error-inner {
    padding: 48px var(--pad-mobile) 64px;
  }

  .error-code {
    font-size: 44px;
  }

  .error-actions .btn {
    flex: 1 1 100%;
  }
}

/* ==========================================================================
   motion — 淡入增强（不影响初始可见）
   ========================================================================== */

@media (prefers-reduced-motion: no-preference) {
  .reveal {
    animation: rise-in 0.26s ease both;
  }

  @keyframes rise-in {
    from {
      transform: translateY(12px);
      opacity: 0.001;
    }
    to {
      transform: none;
      opacity: 1;
    }
  }
}

/* 程序验收反馈：移动端正文优先 */
@media (max-width: 768px) {
  .site-main :is(.page-content, .main-content, .content-main) {
    order: 1;
  }

  .site-main :is(aside, .sidebar) {
    order: 2;
  }
}