:root {
  --color-primary: #1f3a5f;
  --color-secondary: #2f6f8f;
  --color-bg: #f6f7f9;
  --color-card: #ffffff;
  --color-border: #dfe3e8;
  --color-text: #2b2f36;
  --color-muted: #5a636e;
  --container: 1180px;
  --radius: 6px;
  --shadow-sm: 0 1px 2px rgba(31, 58, 95, 0.06);
  --shadow-hover: 0 6px 18px rgba(31, 58, 95, 0.1);
}

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

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

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

body {
  margin: 0;
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  font-size: 15px;
  line-height: 1.75;
  overflow-wrap: break-word;
}

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

a {
  color: var(--color-secondary);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

h1,
h2,
h3,
h4 {
  color: var(--color-primary);
  font-weight: 700;
  line-height: 1.4;
  margin: 0 0 0.6em;
}

p {
  margin: 0 0 1em;
}

ul,
ol {
  margin: 0 0 1em;
  padding: 0;
  list-style: none;
}

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

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

/* ==========================================================================
   layout
   ========================================================================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background-color: var(--color-primary);
  color: #fff;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.12);
}

.header-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 20px;
  min-height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand {
  display: flex;
  flex-direction: column;
  justify-content: center;
  color: #fff;
  padding: 10px 0;
}

.brand:hover {
  color: #fff;
}

.brand-name {
  font-size: 19px;
  font-weight: 700;
  line-height: 1.25;
}

.brand-slogan {
  font-size: 12px;
  color: rgba(255, 255, 255, 0.72);
  line-height: 1.4;
}

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

.nav-list {
  display: flex;
  align-items: center;
  gap: 4px;
  margin: 0;
}

.nav-item {
  display: flex;
}

.nav-link {
  display: flex;
  align-items: center;
  min-height: 44px;
  padding: 0 14px;
  color: rgba(255, 255, 255, 0.86);
  font-size: 15px;
  border-radius: var(--radius);
  transition: background-color 0.2s ease, color 0.2s ease;
}

.nav-link:hover {
  color: #fff;
  background-color: rgba(255, 255, 255, 0.1);
}

.nav-link.is-current {
  color: #fff;
  background-color: rgba(255, 255, 255, 0.16);
  font-weight: 600;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 0 10px;
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.4);
  border-radius: var(--radius);
}

.nav-toggle-bar {
  display: block;
  height: 2px;
  width: 100%;
  background-color: #fff;
  border-radius: 1px;
}

.site-main {
  display: block;
}

.home-main {
  padding-bottom: 8px;
}

.inner-main {
  max-width: var(--container);
  margin: 0 auto;
  padding: 24px 20px 56px;
}

.section {
  max-width: var(--container);
  margin: 0 auto;
  padding: 40px 20px;
}

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

.section-title {
  font-size: 22px;
  margin-bottom: 8px;
}

.section-desc {
  color: var(--color-muted);
  font-size: 14px;
  max-width: 62ch;
  margin-bottom: 0;
}

.section-intro {
  color: var(--color-muted);
  font-size: 14px;
  max-width: 68ch;
  margin-bottom: 18px;
}

.section-more {
  margin: 20px 0 0;
}

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 600;
  min-height: 44px;
}

.text-link::after {
  content: "\2192";
  font-size: 14px;
}

/* ==========================================================================
   components
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 22px;
  border-radius: var(--radius);
  font-size: 15px;
  font-weight: 600;
  border: 1px solid transparent;
  transition: background-color 0.2s ease, color 0.2s ease,
    border-color 0.2s ease, transform 0.2s ease;
}

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

.btn-primary:hover {
  background-color: #16304f;
  border-color: #16304f;
  color: #fff;
}

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

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

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

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

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--color-muted);
  margin-bottom: 16px;
}

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

.breadcrumb-sep {
  color: #9aa3ad;
}

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

.page-header {
  margin-bottom: 28px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--color-border);
}

.page-description {
  color: var(--color-secondary);
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 8px;
}

.page-title {
  font-size: 32px;
  margin-bottom: 10px;
}

.page-summary {
  color: var(--color-muted);
  font-size: 15px;
  max-width: 68ch;
  margin-bottom: 0;
}

.card-link,
.section-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 44px;
  font-weight: 600;
  font-size: 14px;
}

.card-link::after,
.section-link::after {
  content: "\2192";
  font-size: 13px;
}

/* 图片容器与图片统一约束 */

.hero-media,
.card-media,
.channel-figure,
.media-figure,
.updates-figure {
  margin: 0;
  overflow: hidden;
  border-radius: var(--radius);
  background-color: #e8ecf1;
}

.hero-media img,
.card-media img,
.channel-figure img,
.media-figure img,
.updates-figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-media figcaption,
.channel-figure figcaption,
.media-caption,
.updates-figure-caption {
  font-size: 13px;
  color: var(--color-muted);
  padding: 10px 2px 0;
  line-height: 1.6;
}

/* ==========================================================================
   pages - 首页
   ========================================================================== */

.hero {
  background-color: #eef2f6;
  border-bottom: 1px solid var(--color-border);
}

.hero-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 44px 20px;
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
  gap: 40px;
  align-items: center;
}

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

.hero-kicker {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-secondary);
  background-color: #fff;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  padding: 4px 14px;
  margin-bottom: 14px;
}

.hero-title {
  font-size: 32px;
  margin-bottom: 14px;
}

.hero-text {
  font-size: 16px;
  color: #3c434c;
  max-width: 56ch;
  margin-bottom: 22px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 22px;
}

.hero-points {
  display: grid;
  gap: 8px;
  margin: 0;
}

.hero-points li {
  position: relative;
  padding-left: 20px;
  font-size: 14px;
  color: var(--color-muted);
}

.hero-points li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 10px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--color-secondary);
}

.hero-media {
  aspect-ratio: 16 / 10;
}

/* 频道方向总览 */

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

.channel-card {
  display: flex;
  flex-direction: column;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s ease, box-shadow 0.2s ease,
    border-color 0.2s ease;
}

.channel-card:hover {
  transform: translateY(-2px);
  border-color: #c3ccd6;
  box-shadow: var(--shadow-hover);
}

.channel-card .card-media {
  aspect-ratio: 16 / 9;
  border-radius: 0;
}

.channel-card .card-body {
  display: flex;
  flex-direction: column;
  flex: 1;
  padding: 18px 20px 20px;
}

.channel-card .card-title {
  font-size: 17px;
  margin-bottom: 8px;
}

.channel-card .card-scope {
  font-size: 14px;
  color: var(--color-text);
  margin-bottom: 8px;
}

.channel-card .card-sample {
  font-size: 13px;
  color: var(--color-muted);
  margin-bottom: 12px;
}

.channel-card .card-link {
  margin-top: auto;
}

/* 本周专题片单速览 */

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

.topic-card {
  display: flex;
  flex-direction: column;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s ease, box-shadow 0.2s ease,
    border-color 0.2s ease;
}

.topic-card:hover {
  transform: translateY(-2px);
  border-color: #c3ccd6;
  box-shadow: var(--shadow-hover);
}

.topic-card .card-body {
  display: flex;
  flex-direction: column;
  flex: 1;
}

.topic-card .card-title {
  font-size: 17px;
  margin-bottom: 8px;
}

.topic-card .card-scope {
  font-size: 14px;
  margin-bottom: 8px;
}

.topic-card .card-count {
  font-size: 13px;
  color: var(--color-muted);
  margin-bottom: 12px;
}

.topic-card .card-link {
  margin-top: auto;
}

/* 最近更新记录摘要 */

.update-timeline {
  position: relative;
  margin: 0;
  padding-left: 22px;
  border-left: 2px solid var(--color-border);
}

.update-item {
  position: relative;
  padding: 0 0 20px 14px;
}

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

.update-item::before {
  content: "";
  position: absolute;
  left: -29px;
  top: 8px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background-color: var(--color-secondary);
  border: 2px solid var(--color-bg);
}

.update-date {
  display: inline-block;
  font-size: 13px;
  color: var(--color-muted);
  margin-right: 10px;
}

.update-tag {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  color: var(--color-primary);
  background-color: #e7edf3;
  border-radius: 4px;
  padding: 1px 8px;
  margin-right: 10px;
}

.update-title {
  font-weight: 600;
  color: var(--color-primary);
}

.update-summary {
  font-size: 14px;
  color: var(--color-muted);
  margin: 6px 0 0;
}

/* 观看前需要知道的三件事 */

.before-watch .step-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
  counter-reset: watch-step;
}

.before-watch .step-item {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-left: 3px solid var(--color-secondary);
  border-radius: var(--radius);
  padding: 18px 20px;
}

.before-watch .step-index {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  color: var(--color-secondary);
  margin-bottom: 6px;
}

.before-watch .step-title {
  font-size: 17px;
  margin-bottom: 6px;
}

.before-watch .step-text {
  font-size: 14px;
  color: var(--color-muted);
  margin-bottom: 0;
}

/* ==========================================================================
   pages - 频道分类
   ========================================================================== */

.page-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 260px;
  gap: 32px;
  align-items: start;
}

.page-layout.sidebar-left {
  grid-template-columns: 260px minmax(0, 1fr);
}

.channel-index {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 20px;
  position: sticky;
  top: 88px;
}

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

.index-list {
  display: grid;
  gap: 4px;
  margin-bottom: 14px;
}

.index-item a {
  display: flex;
  align-items: center;
  min-height: 44px;
  padding: 0 10px;
  font-size: 14px;
  color: var(--color-text);
  border-radius: var(--radius);
  border-left: 3px solid transparent;
  transition: background-color 0.2s ease, border-color 0.2s ease,
    color 0.2s ease;
}

.index-item a:hover {
  background-color: #eef2f6;
  border-left-color: var(--color-secondary);
  color: var(--color-primary);
}

.index-note {
  font-size: 13px;
  color: var(--color-muted);
  margin-bottom: 0;
}

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

.channel-section {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 24px;
  scroll-margin-top: 88px;
}

.channel-section .section-title {
  font-size: 20px;
  margin-bottom: 8px;
}

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

.channel-figure {
  aspect-ratio: 21 / 9;
  margin-bottom: 18px;
}

.entry-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin-bottom: 16px;
}

.entry-item {
  background-color: #f4f6f9;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 12px 14px;
  font-size: 14px;
  color: var(--color-text);
}

.channel-compare {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 24px;
}

.table-wrap {
  width: 100%;
  overflow-x: auto;
}

.compare-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  min-width: 560px;
}

.table-caption {
  caption-side: top;
  text-align: left;
  font-size: 13px;
  color: var(--color-muted);
  padding-bottom: 10px;
}

.compare-table th,
.compare-table td {
  border: 1px solid var(--color-border);
  padding: 10px 12px;
  text-align: left;
  vertical-align: top;
}

.compare-table thead th {
  background-color: #eef2f6;
  color: var(--color-primary);
  font-weight: 600;
}

.compare-table tbody th {
  background-color: #f7f9fb;
  color: var(--color-primary);
  font-weight: 600;
  white-space: nowrap;
}

.compare-note {
  font-size: 13px;
  color: var(--color-muted);
  margin: 14px 0 0;
}

.compare-note a {
  margin-right: 14px;
}

/* ==========================================================================
   pages - 专题片单
   ========================================================================== */

.topic-overview .section-desc a {
  margin-left: 12px;
  font-weight: 600;
}

.topic-overview .topic-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.topic-sequences .section-desc {
  margin-bottom: 0;
}

.topic-sequence {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 22px 24px;
  margin-top: 20px;
  scroll-margin-top: 88px;
}

.topic-sequence-head {
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 12px;
  margin-bottom: 14px;
}

.topic-sequence-title {
  font-size: 18px;
  margin-bottom: 6px;
}

.topic-sequence-note {
  font-size: 14px;
  color: var(--color-muted);
  margin-bottom: 0;
}

.sequence-list {
  counter-reset: sequence;
  display: grid;
  gap: 10px;
  margin: 0;
}

.sequence-item {
  display: grid;
  grid-template-columns: minmax(0, 200px) minmax(0, 1fr);
  gap: 16px;
  align-items: baseline;
  padding: 10px 0;
  border-bottom: 1px dashed var(--color-border);
}

.sequence-item:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

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

.sequence-desc {
  font-size: 14px;
  color: var(--color-muted);
}

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

.topic-diff .diff-item {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-top: 3px solid var(--color-secondary);
  border-radius: var(--radius);
  padding: 16px 18px;
  font-size: 14px;
  color: var(--color-text);
}

.media-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

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

.media-figure .media-caption {
  padding: 8px 2px 0;
}

.media-hint {
  margin: 18px 0 0;
  font-size: 14px;
  color: var(--color-muted);
}

.media-hint a {
  margin-right: 14px;
  font-weight: 600;
}

/* ==========================================================================
   pages - 最近更新
   ========================================================================== */

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

.type-tag-item {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 16px 18px;
}

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

.type-tag-desc {
  font-size: 14px;
  color: var(--color-muted);
  margin-bottom: 0;
}

.updates-figure {
  aspect-ratio: 21 / 9;
  margin-bottom: 24px;
}

.timeline-list {
  position: relative;
  margin: 0;
  padding-left: 24px;
  border-left: 2px solid var(--color-border);
}

.timeline-item {
  position: relative;
  padding: 0 0 22px 16px;
}

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

.timeline-item::before {
  content: "";
  position: absolute;
  left: -31px;
  top: 8px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background-color: var(--color-secondary);
  border: 2px solid var(--color-bg);
}

.timeline-date {
  display: inline-block;
  font-size: 13px;
  color: var(--color-muted);
  margin-right: 10px;
}

.timeline-type {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  color: var(--color-primary);
  background-color: #e7edf3;
  border-radius: 4px;
  padding: 1px 8px;
  margin-right: 10px;
}

.timeline-body {
  display: block;
}

.timeline-name {
  font-size: 16px;
  margin: 8px 0 4px;
}

.timeline-summary {
  font-size: 14px;
  color: var(--color-muted);
  margin-bottom: 0;
}

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

.trend-item {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 16px 18px;
}

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

.trend-desc {
  font-size: 14px;
  color: var(--color-muted);
  margin-bottom: 0;
}

.updates-more {
  margin: 20px 0 0;
  font-size: 14px;
}

.updates-more a {
  margin-right: 16px;
  font-weight: 600;
}

/* ==========================================================================
   pages - 观看指南
   ========================================================================== */

.guide-steps-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 28px;
  align-items: start;
}

.guide-steps-main {
  min-width: 0;
}

.guide-steps-main .step-list {
  display: grid;
  gap: 14px;
  margin: 0;
}

.guide-steps-main .step-item {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 16px 18px;
}

.guide-steps-main .step-index {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background-color: #e7edf3;
  color: var(--color-primary);
  font-weight: 700;
  font-size: 14px;
}

.guide-steps-main .step-body {
  min-width: 0;
}

.guide-steps-main .step-title {
  font-size: 16px;
  margin-bottom: 4px;
}

.guide-steps-main .step-text {
  font-size: 14px;
  color: var(--color-muted);
  margin-bottom: 0;
}

.guide-media {
  position: sticky;
  top: 88px;
}

.guide-media .media-figure {
  aspect-ratio: 4 / 3;
}

.quality-block {
  margin-top: 24px;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 20px 22px;
}

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

.quality-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin: 0;
}

.quality-item {
  border-left: 3px solid var(--color-secondary);
  padding-left: 12px;
}

.quality-name {
  font-size: 15px;
  margin-bottom: 4px;
}

.quality-text {
  font-size: 14px;
  color: var(--color-muted);
  margin-bottom: 0;
}

.guide-boundary .boundary-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin: 0;
}

.boundary-item {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 16px 18px;
}

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

.boundary-text {
  font-size: 14px;
  color: var(--color-muted);
  margin-bottom: 0;
}

.faq-list {
  display: grid;
  gap: 10px;
}

.faq-item {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  min-height: 48px;
  padding: 12px 18px;
  font-size: 15px;
  font-weight: 600;
  color: var(--color-primary);
  cursor: pointer;
  list-style: none;
}

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

.faq-question::after {
  content: "+";
  flex: none;
  font-size: 18px;
  font-weight: 400;
  color: var(--color-secondary);
  transition: transform 0.2s ease;
}

.faq-item[open] .faq-question::after {
  content: "\2212";
}

.faq-question:hover {
  background-color: #f4f6f9;
}

.faq-answer {
  padding: 0 18px 16px;
  border-top: 1px solid var(--color-border);
}

.faq-answer p {
  font-size: 14px;
  color: var(--color-text);
  margin: 12px 0 0;
}

.faq-answer a {
  margin-right: 12px;
  font-weight: 600;
}

.feedback-block {
  margin-top: 24px;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-left: 3px solid var(--color-secondary);
  border-radius: var(--radius);
  padding: 20px 22px;
}

.feedback-title {
  font-size: 17px;
  margin-bottom: 8px;
}

.feedback-text {
  font-size: 14px;
  color: var(--color-text);
  margin-bottom: 12px;
}

.feedback-list {
  display: grid;
  gap: 8px;
  margin-bottom: 12px;
}

.feedback-item {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  color: var(--color-muted);
}

.feedback-item::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 10px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--color-secondary);
}

.feedback-note {
  font-size: 14px;
  margin-bottom: 0;
}

.feedback-note a {
  font-weight: 600;
}

/* ==========================================================================
   pages - 404
   ========================================================================== */

.error-main {
  max-width: var(--container);
  margin: 0 auto;
  padding: 56px 20px 64px;
}

.error-panel {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 40px 32px;
  text-align: center;
}

.error-code {
  font-size: 48px;
  font-weight: 700;
  color: var(--color-secondary);
  line-height: 1;
  margin-bottom: 12px;
}

.error-title {
  font-size: 28px;
  margin-bottom: 12px;
}

.error-text {
  color: var(--color-muted);
  max-width: 60ch;
  margin: 0 auto 10px;
}

.error-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin-top: 22px;
}

.error-links {
  margin-top: 32px;
}

.error-links .section-title {
  text-align: center;
  margin-bottom: 16px;
}

.error-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin: 0;
}

.error-list a {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 52px;
  padding: 10px 16px;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 600;
  text-align: center;
  transition: border-color 0.2s ease, background-color 0.2s ease;
}

.error-list a:hover {
  background-color: #eef2f6;
  border-color: #c3ccd6;
}

/* ==========================================================================
   footer
   ========================================================================== */

.site-footer {
  background-color: var(--color-primary);
  color: rgba(255, 255, 255, 0.82);
  margin-top: 40px;
}

.footer-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 40px 20px 28px;
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr) minmax(0, 1.2fr);
  gap: 32px;
}

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

.footer-title {
  color: #fff;
  font-size: 16px;
  margin-bottom: 12px;
}

.footer-text {
  font-size: 14px;
  line-height: 1.8;
  margin-bottom: 0;
}

.footer-list {
  display: grid;
  gap: 2px;
  margin: 0;
}

.footer-list a {
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  color: rgba(255, 255, 255, 0.82);
  font-size: 14px;
}

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

.footer-note {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.66);
  margin: 10px 0 0;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.18);
}

.footer-copy {
  max-width: var(--container);
  margin: 0 auto;
  padding: 16px 20px;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.66);
}

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

@media (max-width: 960px) {
  .header-inner {
    flex-wrap: wrap;
    min-height: 60px;
    padding: 8px 20px;
  }

  .nav-toggle {
    display: flex;
  }

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

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    padding: 8px 0 12px;
  }

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

  .nav-item {
    display: block;
  }

  .nav-link {
    justify-content: flex-start;
    padding: 0 12px;
    min-height: 48px;
  }

  .hero-inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 26px;
    padding: 32px 20px;
  }

  .hero-media {
    order: -1;
    aspect-ratio: 16 / 9;
  }

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

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

  .section-title {
    font-size: 19px;
  }

  .section {
    padding: 30px 20px;
  }

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

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

  .before-watch .step-list,
  .entry-list,
  .topic-diff .diff-list,
  .media-grid,
  .type-tag-list,
  .updates-trends .trend-list,
  .error-list {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-layout,
  .page-layout.sidebar-left {
    grid-template-columns: minmax(0, 1fr);
    gap: 24px;
  }

  .channel-index {
    position: static;
    top: auto;
  }

  .index-list {
    grid-auto-flow: column;
    grid-auto-columns: max-content;
    overflow-x: auto;
    gap: 8px;
    padding-bottom: 6px;
  }

  .index-item a {
    border-left: none;
    border-bottom: 3px solid transparent;
    padding: 0 14px;
    white-space: nowrap;
  }

  .index-item a:hover {
    border-left-color: transparent;
    border-bottom-color: var(--color-secondary);
  }

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

  .guide-steps-layout {
    grid-template-columns: minmax(0, 1fr);
    gap: 22px;
  }

  .guide-media {
    position: static;
    top: auto;
  }

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

  .footer-inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 24px;
    padding: 32px 20px 24px;
  }
}

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

  .brand-name {
    font-size: 17px;
  }

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

  .hero-inner,
  .inner-main,
  .section,
  .error-main {
    padding-left: 16px;
    padding-right: 16px;
  }

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

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

  .hero-text {
    font-size: 15px;
  }

  .hero-actions .btn {
    flex: 1 1 auto;
  }

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

  .channel-section,
  .channel-compare,
  .topic-sequence,
  .quality-block,
  .feedback-block,
  .error-panel {
    padding: 18px 16px;
  }

  .update-item,
  .timeline-item {
    padding-right: 0;
  }

  .footer-inner {
    padding-left: 16px;
    padding-right: 16px;
  }

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