/* ==========================================================================
   飘花飘雪影院 · 整站样式表
   分组：base / layout / components / pages / responsive
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. base —— 变量、重置、排版基础
   -------------------------------------------------------------------------- */

:root {
  --color-primary: #1f4e79;
  --color-primary-dark: #17395a;
  --color-accent: #e08a3c;
  --color-bg: #f5f6f8;
  --color-surface: #ffffff;
  --color-text: #2b2f36;
  --color-text-muted: #5c6470;
  --color-border: #dfe3e8;
  --color-border-strong: #c8cfd8;

  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
    "Source Han Sans SC", "Noto Sans CJK SC", "WenQuanYi Micro Hei",
    system-ui, -apple-system, "Segoe UI", Arial, sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;

  --container: 1120px;
  --radius: 6px;
  --radius-sm: 4px;
  --shadow-card: 0 1px 2px rgba(31, 78, 121, 0.06);
  --shadow-raise: 0 4px 14px rgba(31, 78, 121, 0.1);
  --header-height: 68px;
}

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 88px;
}

body.site-body {
  margin: 0;
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.7;
  font-weight: 400;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

h1,
h2,
h3,
h4,
p,
figure,
dl,
dd,
ol,
ul {
  margin: 0;
  padding: 0;
}

ol,
ul {
  list-style: none;
}

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

h1 {
  font-size: 32px;
}

h2 {
  font-size: 22px;
}

h3 {
  font-size: 17px;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color 0.15s ease, border-color 0.15s ease, background-color 0.15s ease;
}

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

img {
  display: block;
  max-width: 100%;
  height: auto;
  border: 0;
  background-color: #e9edf2;
}

button {
  font: inherit;
  color: inherit;
}

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

/* --------------------------------------------------------------------------
   2. layout —— 页头、主导航、主容器、页脚骨架
   -------------------------------------------------------------------------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  box-shadow: 0 1px 0 rgba(31, 78, 121, 0.04);
}

.site-header-inner {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 20px;
  min-height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.site-brand {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 2px;
  padding: 10px 0;
  color: var(--color-primary);
  min-width: 0;
}

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

.site-brand-name {
  font-size: 20px;
  font-weight: 600;
  line-height: 1.25;
  white-space: nowrap;
}

.site-brand-slogan {
  font-size: 12px;
  font-weight: 400;
  line-height: 1.4;
  color: var(--color-text-muted);
  white-space: nowrap;
}

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

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

.nav-item {
  display: block;
}

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

.nav-link:hover {
  color: var(--color-primary);
  background-color: #eef2f6;
}

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

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 0 10px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-sm);
  cursor: pointer;
}

.nav-toggle-bar {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--color-primary);
  border-radius: 1px;
}

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

.inner-main {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 20px 56px;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 18px 0 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--color-text-muted);
}

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

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

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

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

.page-header {
  padding: 16px 0 22px;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 28px;
}

.page-title {
  font-size: 32px;
  font-weight: 600;
  line-height: 1.3;
  color: var(--color-primary);
}

.page-description {
  margin-top: 10px;
  max-width: 860px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--color-text-muted);
}

.section {
  padding: 34px 0;
  border-top: 1px solid var(--color-border);
}

.section:first-of-type {
  border-top: 0;
}

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

.section-title {
  font-size: 22px;
  font-weight: 600;
  line-height: 1.35;
  color: var(--color-primary);
}

.section-desc,
.section-intro {
  margin-top: 8px;
  max-width: 800px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--color-text-muted);
}

.section-foot {
  margin-top: 18px;
  font-size: 14px;
}

.layout-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 32px;
  align-items: start;
}

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

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

.site-footer {
  flex-shrink: 0;
  margin-top: auto;
  background-color: #22303f;
  color: #c3ccd6;
  font-size: 14px;
}

.site-footer-inner {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 40px 20px 28px;
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) repeat(4, minmax(0, 1fr));
  gap: 28px;
}

.footer-brand-name {
  font-size: 17px;
  font-weight: 600;
  color: #ffffff;
}

.footer-brand-desc {
  margin-top: 10px;
  line-height: 1.75;
  color: #9fadbb;
}

.footer-group-title {
  font-size: 14px;
  font-weight: 600;
  color: #ffffff;
  padding-bottom: 10px;
  margin-bottom: 12px;
  border-bottom: 1px solid #33445a;
}

.footer-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-link {
  color: #b6c2ce;
  display: inline-block;
  padding: 3px 0;
}

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

.footer-bottom {
  border-top: 1px solid #33445a;
}

.footer-copyright {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 16px 20px;
  font-size: 13px;
  line-height: 1.6;
  color: #8b98a6;
}

/* --------------------------------------------------------------------------
   3. components —— 通用按钮、链接、编号、条目等
   -------------------------------------------------------------------------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 20px;
  font-size: 15px;
  font-weight: 500;
  line-height: 1.4;
  border: 1px solid transparent;
  border-radius: var(--radius);
  cursor: pointer;
  text-align: center;
}

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

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

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

.btn-ghost:hover {
  border-color: var(--color-primary);
  background-color: #eef2f6;
  color: var(--color-primary);
}

.text-link,
.inline-link,
.collection-link,
.channel-link,
.channel-entry,
.related-link,
.aside-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-primary);
}

.text-link::after,
.inline-link::after,
.collection-link::after,
.channel-link::after,
.channel-entry::after,
.related-link::after,
.aside-link::after {
  content: "›";
  font-size: 15px;
  line-height: 1;
  color: var(--color-accent);
}

.text-link:hover,
.inline-link:hover,
.collection-link:hover,
.channel-link:hover,
.channel-entry:hover,
.related-link:hover,
.aside-link:hover {
  color: var(--color-accent);
}

.channel-no,
.step-no,
.step-index {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  color: var(--color-accent);
  font-weight: 600;
}

/* --------------------------------------------------------------------------
   4. pages —— 首页
   -------------------------------------------------------------------------- */

.lead-bar {
  background-color: #eef2f6;
  border-bottom: 1px solid var(--color-border);
  font-size: 13px;
}

.lead-bar-inner {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 9px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.lead-bar-text {
  color: var(--color-text-muted);
  line-height: 1.6;
}

.lead-bar-stage {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  color: var(--color-text);
  white-space: nowrap;
}

.stage-mark {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--color-accent);
}

.hero-section {
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

.hero-inner {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 40px 20px 44px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 460px);
  gap: 40px;
  align-items: center;
}

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

.hero-kicker {
  display: inline-block;
  padding: 4px 10px;
  font-size: 12px;
  line-height: 1.5;
  color: var(--color-primary);
  background-color: #eef2f6;
  border-left: 3px solid var(--color-accent);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.hero-title {
  margin-top: 16px;
  font-size: 32px;
  font-weight: 600;
  line-height: 1.32;
  color: var(--color-primary);
}

.hero-lead {
  margin-top: 14px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-text-muted);
  max-width: 560px;
}

.hero-points {
  margin-top: 18px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.hero-point {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text);
}

.hero-point::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 7px;
  height: 7px;
  border: 2px solid var(--color-accent);
  border-radius: 50%;
}

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

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

.hero-figure img {
  width: 100%;
  height: 320px;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
}

.hero-caption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--color-text-muted);
}

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

.channel-row {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr) 132px;
  gap: 18px;
  align-items: start;
  padding: 18px 0;
  border-bottom: 1px solid var(--color-border);
}

.channel-overview .channel-no {
  font-size: 18px;
  line-height: 1.5;
}

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

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

.channel-scope {
  margin-top: 6px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text);
}

.channel-fit {
  margin-top: 6px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--color-text-muted);
}

.channel-overview .channel-link {
  align-self: center;
  justify-self: end;
  white-space: nowrap;
}

.collection-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px;
}

.collection-card {
  display: grid;
  grid-template-columns: 176px minmax(0, 1fr);
  gap: 0;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  transition: box-shadow 0.18s ease, border-color 0.18s ease;
}

.collection-card:hover {
  border-color: var(--color-border-strong);
  box-shadow: var(--shadow-raise);
}

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

.collection-figure img {
  width: 100%;
  height: 100%;
  min-height: 168px;
  object-fit: cover;
}

.collection-body {
  min-width: 0;
  padding: 16px 18px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.collection-name {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-primary);
}

.collection-theme {
  font-size: 13px;
  line-height: 1.7;
  color: var(--color-text);
}

.collection-reason {
  font-size: 13px;
  line-height: 1.7;
  color: var(--color-text-muted);
}

.collection-card .collection-link {
  margin-top: auto;
  padding-top: 8px;
}

.browse-steps .step-list {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}

.browse-steps .step-item {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-top: 3px solid var(--color-primary);
  border-radius: var(--radius);
  padding: 18px 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 0;
}

.browse-steps .step-no {
  font-size: 13px;
  letter-spacing: 0.04em;
}

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

.browse-steps .step-action {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text);
}

.browse-steps .step-result {
  font-size: 13px;
  line-height: 1.7;
  color: var(--color-text-muted);
}

.browse-steps .step-fallback {
  font-size: 13px;
  line-height: 1.7;
  color: var(--color-accent);
  border-top: 1px dashed var(--color-border);
  padding-top: 8px;
}

.step-more {
  margin-top: 18px;
  font-size: 14px;
}

.field-boundary-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 26px;
}

.field-column,
.boundary-column {
  min-width: 0;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 20px 22px;
}

.column-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-primary);
  padding-bottom: 10px;
  margin-bottom: 12px;
  border-bottom: 1px solid var(--color-border);
}

.field-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.field-term {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text);
}

.field-desc {
  font-size: 14px;
  line-height: 1.75;
  color: var(--color-text-muted);
  margin-bottom: 8px;
}

.field-desc:last-child {
  margin-bottom: 0;
}

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

.boundary-item {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--color-text-muted);
}

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

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

.record-group {
  min-width: 0;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-left: 3px solid var(--color-accent);
  border-radius: var(--radius);
  padding: 18px 20px;
}

.record-stage {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-primary);
  padding-bottom: 10px;
  margin-bottom: 12px;
  border-bottom: 1px solid var(--color-border);
}

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

.record-item {
  position: relative;
  padding-left: 16px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--color-text-muted);
}

.record-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 6px;
  height: 1px;
  background-color: var(--color-border-strong);
}

.record-more {
  margin-top: 18px;
  font-size: 14px;
}

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

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

.index-link {
  display: flex;
  flex-direction: column;
  gap: 8px;
  height: 100%;
  padding: 18px 16px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  transition: border-color 0.18s ease, box-shadow 0.18s ease;
}

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

.index-name {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-primary);
}

.index-note {
  font-size: 13px;
  line-height: 1.7;
  color: var(--color-text-muted);
}

/* --------------------------------------------------------------------------
   5. pages —— 内页：频道分类
   -------------------------------------------------------------------------- */

.section-channels .section-title,
.section-fields .section-title,
.section-related .section-title {
  font-size: 20px;
}

.section-channels .channel-row {
  grid-template-columns: 150px minmax(0, 1fr) 120px;
  gap: 20px;
  align-items: start;
  padding: 20px 0;
  border-bottom: 1px solid var(--color-border);
}

.section-channels .channel-row:first-of-type {
  border-top: 1px solid var(--color-border);
}

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

.channel-figure img {
  width: 100%;
  height: 104px;
  object-fit: cover;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
}

.section-channels .channel-no {
  font-size: 13px;
  letter-spacing: 0.04em;
}

.section-channels .channel-name {
  margin-top: 4px;
  font-size: 17px;
}

.channel-meta {
  margin-top: 10px;
  display: grid;
  grid-template-columns: 78px minmax(0, 1fr);
  gap: 4px 12px;
}

.channel-meta-key {
  font-size: 13px;
  color: var(--color-text-muted);
  padding-top: 2px;
}

.channel-meta-value {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text);
}

.section-channels .channel-entry {
  align-self: center;
  justify-self: end;
  white-space: nowrap;
}

.section-fields .field-item {
  min-width: 0;
  padding: 16px 0;
  border-bottom: 1px solid var(--color-border);
}

.section-fields .field-item:last-of-type {
  border-bottom: 0;
  padding-bottom: 0;
}

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

.field-text {
  margin-top: 6px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--color-text-muted);
  max-width: 720px;
}

.section-related {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 20px;
}

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

.related-item {
  min-width: 0;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-border);
}

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

/* --------------------------------------------------------------------------
   6. pages —— 内页：专题片单
   -------------------------------------------------------------------------- */

.page-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 32px;
  align-items: start;
}

.collections-section .section-title,
.collections-tips .section-title,
.aside-title {
  font-size: 20px;
}

.collection-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin-top: 20px;
}

.collection-item {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  gap: 0;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  transition: box-shadow 0.18s ease, border-color 0.18s ease;
}

.collection-item:hover {
  border-color: var(--color-border-strong);
  box-shadow: var(--shadow-raise);
}

.collection-media {
  margin: 0;
  min-width: 0;
}

.collection-media img {
  width: 100%;
  height: 100%;
  min-height: 176px;
  object-fit: cover;
}

.collection-item .collection-body {
  padding: 18px 20px;
  gap: 7px;
}

.collection-topic {
  font-size: 13px;
  line-height: 1.7;
  color: var(--color-text);
}

.collection-meta {
  margin-top: 4px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--color-text-muted);
}

.collection-item .collection-link {
  margin-top: auto;
  padding-top: 8px;
}

.collections-tips {
  margin-top: 34px;
  padding-top: 28px;
  border-top: 1px solid var(--color-border);
}

.tips-list {
  margin-top: 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.tips-item {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--color-text-muted);
}

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

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

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

.aside-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-primary);
  padding-bottom: 10px;
  margin-bottom: 12px;
  border-bottom: 1px solid var(--color-border);
}

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

.relation-list {
  margin-top: 14px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.relation-row {
  min-width: 0;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-border);
}

.relation-row:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.relation-term {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text);
}

.relation-desc {
  margin-top: 4px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--color-text-muted);
}

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

.aside-link-item {
  min-width: 0;
}

/* --------------------------------------------------------------------------
   7. pages —— 内页：浏览指引
   -------------------------------------------------------------------------- */

.guide-steps .section-title,
.guide-faq .section-title,
.guide-related .section-title {
  font-size: 20px;
}

.guide-steps .step-list {
  margin-top: 22px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.guide-steps .step-item {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  gap: 0;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-card);
}

.step-media {
  margin: 0;
  min-width: 0;
}

.step-media img {
  width: 100%;
  height: 100%;
  min-height: 176px;
  object-fit: cover;
}

.step-body {
  min-width: 0;
  padding: 18px 20px;
  display: flex;
  flex-direction: column;
  gap: 7px;
}

.guide-steps .step-index {
  font-size: 13px;
  letter-spacing: 0.04em;
}

.guide-steps .step-title {
  font-size: 17px;
  font-weight: 600;
  color: var(--color-primary);
}

.guide-steps .step-action {
  font-size: 14px;
  line-height: 1.75;
  color: var(--color-text);
}

.guide-steps .step-result {
  font-size: 13px;
  line-height: 1.7;
  color: var(--color-text-muted);
}

.guide-steps .step-issue {
  font-size: 13px;
  line-height: 1.7;
  color: var(--color-accent);
  border-top: 1px dashed var(--color-border);
  padding-top: 8px;
}

.guide-faq {
  margin-top: 34px;
  padding-top: 28px;
  border-top: 1px solid var(--color-border);
}

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

.faq-question {
  padding: 15px 44px 15px 18px;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.6;
  color: var(--color-primary);
  cursor: pointer;
  list-style: none;
  position: relative;
}

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

.faq-question::after {
  content: "+";
  position: absolute;
  right: 18px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 18px;
  line-height: 1;
  color: var(--color-accent);
}

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

.faq-question:hover {
  background-color: #f7f9fb;
}

.faq-answer {
  padding: 14px 18px 16px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--color-text-muted);
  border-top: 1px solid var(--color-border);
}

.faq-answer p + p {
  margin-top: 8px;
}

.guide-related {
  margin-top: 34px;
  padding-top: 28px;
  border-top: 1px solid var(--color-border);
}

.guide-related .related-list {
  margin-top: 18px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.guide-related .related-item {
  min-width: 0;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 18px 20px;
}

.related-desc {
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--color-text-muted);
}

/* --------------------------------------------------------------------------
   8. pages —— 内页：整理记录
   -------------------------------------------------------------------------- */

.records-stages .section-title,
.records-boundary .section-title,
.records-links .section-title {
  font-size: 20px;
}

.stage-group {
  margin-top: 22px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 20px 22px;
  display: grid;
  grid-template-columns: 200px minmax(0, 1fr);
  gap: 8px 24px;
  align-items: start;
}

.stage-figure {
  grid-row: span 2;
  margin: 0;
  min-width: 0;
}

.stage-figure img {
  width: 100%;
  height: 132px;
  object-fit: cover;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
}

.stage-figure-caption {
  margin-top: 8px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--color-text-muted);
}

.stage-title {
  font-size: 17px;
  font-weight: 600;
  color: var(--color-primary);
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-border);
}

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

.stage-item {
  min-width: 0;
  padding-bottom: 12px;
  border-bottom: 1px dashed var(--color-border);
}

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

.stage-item-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text);
}

.stage-item-desc {
  margin-top: 4px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--color-text-muted);
}

.stage-item-meta {
  margin-top: 6px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--color-accent);
}

.records-boundary {
  margin-top: 34px;
  padding-top: 28px;
  border-top: 1px solid var(--color-border);
}

.records-boundary .boundary-list {
  margin-top: 18px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px 26px;
}

.records-links {
  margin-top: 34px;
  padding-top: 28px;
  border-top: 1px solid var(--color-border);
}

.link-list {
  margin-top: 18px;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

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

.link-card {
  display: flex;
  align-items: center;
  min-height: 60px;
  padding: 14px 16px;
  font-size: 15px;
  font-weight: 500;
  color: var(--color-primary);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-left: 3px solid var(--color-primary);
  border-radius: var(--radius);
  transition: border-color 0.18s ease, box-shadow 0.18s ease, color 0.18s ease;
}

.link-card:hover {
  color: var(--color-accent);
  border-left-color: var(--color-accent);
  box-shadow: var(--shadow-card);
}

/* --------------------------------------------------------------------------
   9. pages —— 404
   -------------------------------------------------------------------------- */

.error-main {
  max-width: var(--container);
  margin: 0 auto;
  padding: 48px 20px 64px;
}

.error-section {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 40px 32px;
  text-align: left;
}

.error-code {
  font-family: var(--font-mono);
  font-size: 42px;
  font-weight: 600;
  line-height: 1.1;
  color: var(--color-accent);
}

.error-title {
  margin-top: 12px;
  font-size: 32px;
  font-weight: 600;
  color: var(--color-primary);
}

.error-desc {
  margin-top: 12px;
  max-width: 640px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-text-muted);
}

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

.error-next {
  margin-top: 32px;
  padding-top: 28px;
  border-top: 1px solid var(--color-border);
}

.error-next-title {
  font-size: 20px;
  font-weight: 600;
  color: var(--color-primary);
}

.error-next-list {
  margin-top: 16px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.error-next-item {
  min-width: 0;
}

.error-next-link {
  display: flex;
  align-items: center;
  min-height: 56px;
  padding: 14px 16px;
  font-size: 15px;
  font-weight: 500;
  color: var(--color-primary);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.error-next-link:hover {
  border-color: var(--color-primary);
  color: var(--color-accent);
}

/* --------------------------------------------------------------------------
   10. responsive —— 平板与手机
   -------------------------------------------------------------------------- */

@media (max-width: 1024px) {
  .hero-inner {
    grid-template-columns: minmax(0, 1fr) minmax(0, 380px);
    gap: 30px;
  }

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

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

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

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

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

@media (max-width: 768px) {
  :root {
    --header-height: 60px;
  }

  html {
    scroll-padding-top: 76px;
  }

  h1 {
    font-size: 24px;
  }

  h2 {
    font-size: 19px;
  }

  .site-header-inner {
    padding: 0 16px;
    flex-wrap: wrap;
    gap: 0;
  }

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

  .site-brand-slogan {
    font-size: 11px;
  }

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    flex-basis: 100%;
    width: 100%;
    display: block;
  }

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 6px 0 12px;
    border-top: 1px solid var(--color-border);
  }

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

  .nav-link {
    padding: 12px 4px;
    border-bottom: 1px solid var(--color-border);
    border-radius: 0;
  }

  .nav-link.is-current {
    border-bottom-color: var(--color-border);
    box-shadow: inset 3px 0 0 var(--color-accent);
    padding-left: 12px;
  }

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

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

  .page-header {
    padding: 14px 0 18px;
    margin-bottom: 22px;
  }

  .section {
    padding: 26px 0;
  }

  .lead-bar-inner {
    padding: 8px 16px;
    gap: 6px;
  }

  .hero-inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 26px;
    padding: 28px 16px 32px;
  }

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

  .hero-figure img {
    height: 220px;
  }

  .channel-row {
    grid-template-columns: 40px minmax(0, 1fr);
    gap: 12px;
  }

  .channel-overview .channel-link {
    grid-column: 2;
    justify-self: start;
    margin-top: 4px;
  }

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

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

  .collection-figure img {
    height: 180px;
    min-height: 0;
  }

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

  .field-boundary-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 18px;
  }

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

  .index-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
  }

  .layout-shell,
  .page-layout {
    grid-template-columns: minmax(0, 1fr);
    gap: 26px;
  }

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

  .channel-figure img {
    height: 168px;
  }

  .section-channels .channel-entry {
    justify-self: start;
    align-self: start;
  }

  .channel-meta {
    grid-template-columns: 76px minmax(0, 1fr);
  }

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

  .collection-media img {
    height: 190px;
    min-height: 0;
  }

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

  .step-media img {
    height: 180px;
    min-height: 0;
  }

  .guide-related .related-list {
    grid-template-columns: minmax(0, 1fr);
    gap: 12px;
  }

  .stage-group {
    grid-template-columns: minmax(0, 1fr);
    gap: 16px;
    padding: 18px;
  }

  .stage-figure {
    grid-row: auto;
  }

  .stage-figure img {
    height: 168px;
  }

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

  .link-list {
    grid-template-columns: minmax(0, 1fr);
    gap: 12px;
  }

  .error-main {
    padding: 32px 16px 48px;
  }

  .error-section {
    padding: 28px 20px;
  }

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

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

  .error-next-list {
    grid-template-columns: minmax(0, 1fr);
    gap: 12px;
  }

  .site-footer-inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 22px;
    padding: 32px 16px 22px;
  }

  .footer-copyright {
    padding: 14px 16px;
  }
}

@media (max-width: 480px) {
  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

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

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

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

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