/* =========================================================
   base
   ========================================================= */
:root {
  --color-primary: #1a2a3a;
  --color-accent: #f5a623;
  --color-white: #ffffff;
  --color-gray: #e0e0e0;
  --color-text: #2c3e50;
  --color-text-light: #5a6b7b;
  --color-bg: #f5f6f8;
  --color-border: #e8eaed;
  --font-main: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  --container-width: 1200px;
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --transition: all 0.25s ease;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-main);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: var(--transition);
}

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

ul, ol {
  list-style: none;
}

h1, h2, h3, h4 {
  font-weight: 600;
  line-height: 1.4;
  color: var(--color-primary);
}

/* =========================================================
   layout
   ========================================================= */
.site-body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

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

.home-main {
  background-color: var(--color-white);
}

.inner-main {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 24px 20px 60px;
  background-color: var(--color-white);
}

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

/* --- header --- */
.site-header {
  background-color: var(--color-primary);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 8px rgba(26, 42, 58, 0.15);
}

.header-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
}

.brand-logo {
  display: flex;
  flex-direction: column;
  line-height: 1.3;
  padding: 8px 0;
}

.brand-name {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-white);
  letter-spacing: 0.02em;
}

.brand-slogan {
  font-size: 12px;
  color: rgba(255, 255, 255, 0.7);
  margin-top: 2px;
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 10px;
  flex-direction: column;
  gap: 5px;
}

.nav-toggle-bar {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-white);
  border-radius: 2px;
}

.site-nav {
  display: block;
}

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

.nav-item {
  position: relative;
}

.nav-link {
  display: block;
  padding: 8px 16px;
  color: rgba(255, 255, 255, 0.85);
  font-size: 15px;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

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

.nav-item.is-current .nav-link,
.nav-link.is-current {
  color: var(--color-white);
  background-color: var(--color-accent);
  font-weight: 500;
}

/* --- breadcrumb --- */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--color-text-light);
  margin-bottom: 20px;
  padding: 12px 0;
  border-bottom: 1px solid var(--color-border);
}

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

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

.breadcrumb-sep {
  color: #a0aab4;
}

.breadcrumb-current {
  color: var(--color-text);
  font-weight: 500;
}

/* --- page header --- */
.page-header {
  margin-bottom: 32px;
}

.page-title {
  font-size: 32px;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1.3;
  margin-bottom: 12px;
}

.page-description {
  font-size: 16px;
  color: var(--color-text-light);
  max-width: 780px;
}

/* --- section title --- */
.section-title {
  font-size: 24px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 16px;
  position: relative;
  padding-bottom: 12px;
}

.section-title::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 40px;
  height: 3px;
  background-color: var(--color-accent);
  border-radius: 2px;
}

.section-intro {
  font-size: 15px;
  color: var(--color-text-light);
  margin-bottom: 24px;
  max-width: 720px;
}

/* --- buttons --- */
.btn-primary,
.btn-secondary {
  display: inline-block;
  padding: 10px 24px;
  font-size: 15px;
  font-weight: 500;
  border-radius: var(--radius-md);
  transition: var(--transition);
  cursor: pointer;
}

.btn-primary {
  background-color: var(--color-accent);
  color: var(--color-primary);
}

.btn-primary:hover {
  background-color: #e09516;
  color: var(--color-primary);
  transform: translateY(-1px);
}

.btn-secondary {
  background-color: transparent;
  color: var(--color-white);
  border: 1px solid rgba(255, 255, 255, 0.6);
}

.btn-secondary:hover {
  background-color: rgba(255, 255, 255, 0.1);
  color: var(--color-white);
  border-color: var(--color-white);
}

/* --- footer --- */
.site-footer {
  background-color: var(--color-primary);
  color: rgba(255, 255, 255, 0.8);
  margin-top: auto;
}

.footer-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px 20px 24px;
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 40px;
}

.footer-brand {
  padding-right: 20px;
}

.footer-slogan {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-white);
  margin-bottom: 12px;
}

.footer-desc {
  font-size: 14px;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.65);
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.footer-group-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-white);
  margin-bottom: 12px;
}

.footer-link-list li {
  margin-bottom: 8px;
}

.footer-link-list a {
  color: rgba(255, 255, 255, 0.7);
  font-size: 14px;
}

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

.footer-bottom {
  grid-column: 1 / -1;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 20px;
  margin-top: 8px;
}

.copyright {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.5);
}

/* =========================================================
   pages - index
   ========================================================= */

/* --- hero --- */
.hero-section {
  background-color: var(--color-primary);
  color: var(--color-white);
  padding: 60px 0;
}

.hero-section {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 48px;
  align-items: center;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px 20px;
}

.hero-media {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
  order: 2;
}

.hero-media img {
  width: 100%;
  height: 320px;
  object-fit: cover;
}

.hero-content {
  order: 1;
}

.hero-title {
  font-size: 36px;
  font-weight: 700;
  color: var(--color-white);
  line-height: 1.3;
  margin-bottom: 16px;
}

.hero-sub {
  display: block;
  font-size: 18px;
  font-weight: 400;
  color: var(--color-accent);
  margin-top: 8px;
}

.hero-desc {
  font-size: 16px;
  color: rgba(255, 255, 255, 0.85);
  margin-bottom: 28px;
  max-width: 480px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

/* --- section block --- */
.section-block {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px 20px;
}

.section-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
}

.section-head .section-title {
  margin-bottom: 0;
}

.section-more {
  font-size: 14px;
  color: var(--color-accent);
  padding: 6px 12px;
  border: 1px solid var(--color-accent);
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.section-more:hover {
  background-color: var(--color-accent);
  color: var(--color-primary);
}

/* --- channels nav --- */
.channels-nav-section {
  background-color: var(--color-white);
}

.channel-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}

.channel-tag {
  display: inline-block;
  padding: 8px 20px;
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 20px;
  font-size: 14px;
  color: var(--color-text);
  transition: var(--transition);
}

.channel-tag:hover {
  background-color: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-primary);
}

/* --- topics grid (home) --- */
.topics-section {
  background-color: var(--color-bg);
}

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

.topic-card {
  background-color: var(--color-white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(26, 42, 58, 0.06);
  transition: var(--transition);
}

.topic-card:hover {
  box-shadow: 0 4px 16px rgba(26, 42, 58, 0.12);
  transform: translateY(-2px);
}

.topic-cover {
  overflow: hidden;
}

.topic-cover img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  transition: var(--transition);
}

.topic-card:hover .topic-cover img {
  transform: scale(1.03);
}

.topic-body {
  padding: 20px;
}

.topic-title {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 8px;
}

.topic-desc {
  font-size: 14px;
  color: var(--color-text-light);
  margin-bottom: 16px;
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.topic-link {
  font-size: 14px;
  color: var(--color-accent);
  font-weight: 500;
}

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

/* --- guide entry --- */
.guide-entry-section {
  background-color: var(--color-white);
}

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

.guide-entry-card {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 24px;
  background-color: var(--color-bg);
  border-radius: var(--radius-lg);
  border-left: 4px solid var(--color-accent);
  transition: var(--transition);
}

.guide-entry-card:hover {
  background-color: #eef0f2;
}

.entry-icon {
  font-size: 28px;
  color: var(--color-accent);
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: rgba(245, 166, 35, 0.12);
  border-radius: var(--radius-md);
}

.entry-title {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 8px;
}

.entry-desc {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.6;
  margin-bottom: 12px;
}

.entry-link {
  font-size: 14px;
  color: var(--color-accent);
  font-weight: 500;
}

/* --- faq preview --- */
.faq-preview-section {
  background-color: var(--color-bg);
}

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

.faq-preview-card {
  background-color: var(--color-white);
  padding: 24px;
  border-radius: var(--radius-lg);
  box-shadow: 0 2px 8px rgba(26, 42, 58, 0.06);
  transition: var(--transition);
}

.faq-preview-card:hover {
  box-shadow: 0 4px 16px rgba(26, 42, 58, 0.1);
}

.faq-preview-title {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 10px;
  color: var(--color-primary);
}

.faq-preview-desc {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.6;
  margin-bottom: 14px;
}

.faq-preview-link {
  font-size: 14px;
  color: var(--color-accent);
  font-weight: 500;
}

/* =========================================================
   pages - channels
   ========================================================= */
.page-channels {
  background-color: var(--color-white);
}

.channel-list {
  margin-bottom: 40px;
}

.channel-item {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 24px;
  padding: 20px 0;
  border-bottom: 1px solid var(--color-border);
  transition: var(--transition);
}

.channel-item:first-child {
  border-top: 1px solid var(--color-border);
}

.channel-item:hover {
  background-color: var(--color-bg);
  padding-left: 12px;
  padding-right: 12px;
  border-radius: var(--radius-lg);
}

.channel-thumb {
  border-radius: var(--radius-md);
  overflow: hidden;
}

.channel-thumb img {
  width: 100%;
  height: 160px;
  object-fit: cover;
}

.channel-info {
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.channel-name {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 10px;
}

.channel-desc {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 14px;
  max-width: 600px;
}

.channel-link {
  align-self: flex-start;
  font-size: 14px;
  color: var(--color-accent);
  font-weight: 500;
  padding: 6px 16px;
  border: 1px solid var(--color-accent);
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.channel-link:hover {
  background-color: var(--color-accent);
  color: var(--color-primary);
}

.channel-guide-note {
  background-color: var(--color-bg);
  padding: 24px;
  border-radius: var(--radius-lg);
  margin-top: 16px;
}

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

.channel-guide-note p {
  font-size: 14px;
  color: var(--color-text-light);
  margin-bottom: 12px;
  line-height: 1.7;
}

.channel-guide-note a {
  color: var(--color-accent);
  font-weight: 500;
}

.channel-guide-note a:hover {
  color: var(--color-primary);
}

/* =========================================================
   pages - topics
   ========================================================= */
.page-topics {
  background-color: var(--color-white);
}

.topic-grid {
  margin-bottom: 48px;
}

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

.topic-card .topic-card-media {
  overflow: hidden;
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.topic-card .topic-card-media img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  transition: var(--transition);
}

.topic-card:hover .topic-card-media img {
  transform: scale(1.03);
}

.topic-card-body {
  padding: 20px;
}

.topic-card-title {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 10px;
}

.topic-card-desc {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.6;
  margin-bottom: 16px;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.topic-card-link {
  font-size: 14px;
  color: var(--color-accent);
  font-weight: 500;
}

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

.topic-details {
  background-color: var(--color-bg);
  padding: 32px 24px;
  border-radius: var(--radius-lg);
}

.topic-detail-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-top: 20px;
}

.topic-detail-item {
  padding: 16px;
  background-color: var(--color-white);
  border-radius: var(--radius-md);
  border-left: 3px solid var(--color-accent);
}

.topic-detail-name {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 8px;
}

.topic-detail-text {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.6;
}

.topic-more-note {
  margin-top: 24px;
  font-size: 14px;
  color: var(--color-text-light);
}

.topic-more-note a {
  color: var(--color-accent);
  font-weight: 500;
}

.topic-more-note a:hover {
  color: var(--color-primary);
}

/* =========================================================
   pages - guide
   ========================================================= */
.page-guide {
  background-color: var(--color-white);
}

.guide-section {
  margin-bottom: 48px;
}

.guide-section .section-intro {
  margin-bottom: 24px;
}

.steps-list {
  counter-reset: step-counter;
}

.step-item {
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: 20px;
  padding: 24px 0;
  border-bottom: 1px solid var(--color-border);
  position: relative;
}

.step-item:last-child {
  border-bottom: none;
}

.step-number {
  width: 48px;
  height: 48px;
  background-color: var(--color-accent);
  color: var(--color-primary);
  font-size: 20px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  position: relative;
  z-index: 1;
}

.step-content {
  padding-top: 4px;
}

.step-title {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 10px;
}

.step-text {
  font-size: 15px;
  color: var(--color-text-light);
  line-height: 1.7;
  max-width: 680px;
}

.app-guide-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

.app-guide-content {
  background-color: var(--color-white);
}

.guide-figure {
  margin: 16px 0;
  border-radius: var(--radius-md);
  overflow: hidden;
}

.guide-figure img {
  width: 100%;
  height: auto;
  max-height: 280px;
  object-fit: cover;
}

.guide-link-card {
  background-color: var(--color-bg);
  padding: 20px;
  border-radius: var(--radius-md);
  border-left: 4px solid var(--color-accent);
  margin-top: 16px;
}

.guide-link-title {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 8px;
}

.guide-link-text {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.6;
}

.guide-faq-links {
  margin-top: 12px;
}

.guide-faq-links a {
  color: var(--color-accent);
  font-weight: 500;
  margin-right: 16px;
}

/* =========================================================
   pages - verify
   ========================================================= */
.page-verify {
  background-color: var(--color-white);
}

.verify-section {
  margin-bottom: 48px;
}

.content-media {
  margin: 16px 0 24px;
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.content-media img {
  width: 100%;
  height: 240px;
  object-fit: cover;
}

.content-media figcaption {
  font-size: 13px;
  color: var(--color-text-light);
  text-align: center;
  padding: 10px;
  background-color: var(--color-bg);
}

.content-media-inline {
  max-width: 640px;
}

.verify-step {
  display: grid;
  grid-template-columns: 64px 1fr;
  gap: 20px;
  padding: 20px 0;
  border-bottom: 1px solid var(--color-border);
}

.verify-step .step-number {
  background-color: var(--color-primary);
  color: var(--color-white);
}

.step-body {
  padding-top: 4px;
}

.step-body .step-title {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 8px;
}

.step-body .step-text {
  font-size: 15px;
  color: var(--color-text-light);
  line-height: 1.7;
  max-width: 680px;
}

.step-link {
  display: inline-block;
  margin-top: 10px;
  font-size: 14px;
  color: var(--color-accent);
  font-weight: 500;
}

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

.risk-section {
  background-color: #fff8f0;
  padding: 28px 24px;
  border-radius: var(--radius-lg);
  margin-bottom: 40px;
  border: 1px solid #f0d9b8;
}

.risk-section .section-title {
  color: #8a5a1a;
}

.risk-section .section-title::after {
  background-color: #d4922a;
}

.risk-item {
  padding: 16px 0;
  border-bottom: 1px dashed #e0c8a8;
}

.risk-item:last-child {
  border-bottom: none;
}

.risk-title {
  font-size: 16px;
  font-weight: 600;
  color: #8a5a1a;
  margin-bottom: 6px;
}

.risk-text {
  font-size: 14px;
  color: #6b4f2a;
  line-height: 1.6;
}

.confirm-section {
  background-color: var(--color-bg);
  padding: 28px 24px;
  border-radius: var(--radius-lg);
}

.confirm-text {
  font-size: 15px;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 20px;
}

.confirm-links {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.confirm-link {
  display: inline-block;
  padding: 8px 20px;
  background-color: var(--color-accent);
  color: var(--color-primary);
  font-size: 14px;
  font-weight: 500;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.confirm-link:hover {
  background-color: var(--color-primary);
  color: var(--color-white);
}

/* =========================================================
   pages - faq
   ========================================================= */
.page-faq {
  background-color: var(--color-white);
}

.faq-list-section {
  margin-bottom: 40px;
}

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

.faq-item {
  border-bottom: 1px solid var(--color-border);
  padding: 4px 0;
}

.faq-item summary {
  padding: 18px 0;
  font-size: 16px;
  font-weight: 500;
  color: var(--color-primary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: var(--transition);
  list-style: none;
  position: relative;
  padding-right: 32px;
}

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

.faq-item summary::after {
  content: "+";
  position: absolute;
  right: 8px;
  font-size: 22px;
  color: var(--color-accent);
  font-weight: 400;
  transition: var(--transition);
}

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

.faq-item summary:hover {
  color: var(--color-accent);
}

.faq-item p {
  font-size: 15px;
  color: var(--color-text-light);
  line-height: 1.7;
  padding: 0 0 20px;
  max-width: 760px;
}

.faq-item p a {
  color: var(--color-accent);
  font-weight: 500;
}

.feedback-entry {
  background-color: var(--color-bg);
  padding: 32px 24px;
  border-radius: var(--radius-lg);
}

.feedback-card {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 24px;
  align-items: center;
}

.feedback-image {
  width: 100%;
  height: 160px;
  object-fit: cover;
  border-radius: var(--radius-md);
}

.feedback-content p {
  font-size: 15px;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 16px;
}

.feedback-links {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px 16px;
  margin-bottom: 16px;
}

.feedback-links a {
  font-size: 14px;
  color: var(--color-accent);
  font-weight: 500;
}

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

.feedback-content p:last-child a {
  color: var(--color-accent);
  font-weight: 500;
}

/* =========================================================
   pages - 404
   ========================================================= */
.site-error {
  background-color: var(--color-white);
}

.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 60vh;
  padding: 40px 20px;
}

.error-panel {
  text-align: center;
  max-width: 520px;
  padding: 48px 32px;
  background-color: var(--color-bg);
  border-radius: var(--radius-lg);
}

.error-code {
  font-size: 72px;
  font-weight: 800;
  color: var(--color-accent);
  line-height: 1;
  margin-bottom: 8px;
}

.error-panel h1 {
  font-size: 24px;
  margin-bottom: 12px;
}

.error-desc {
  font-size: 15px;
  color: var(--color-text-light);
  margin-bottom: 24px;
}

.error-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 24px;
}

.error-actions .btn-secondary {
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.error-actions .btn-secondary:hover {
  background-color: var(--color-primary);
  color: var(--color-white);
}

.error-help {
  font-size: 14px;
  color: var(--color-text-light);
}

.error-help a {
  color: var(--color-accent);
  font-weight: 500;
  margin: 0 4px;
}

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

/* --- tablet --- */
@media (max-width: 992px) {
  .hero-section {
    grid-template-columns: 1fr;
    gap: 32px;
    padding: 40px 20px;
  }

  .hero-media {
    order: 1;
  }

  .hero-content {
    order: 2;
  }

  .hero-title {
    font-size: 30px;
  }

  .footer-inner {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .footer-brand {
    padding-right: 0;
  }

  .channel-item {
    grid-template-columns: 220px 1fr;
  }
}

/* --- mobile --- */
@media (max-width: 768px) {
  .inner-main {
    padding: 16px 16px 48px;
  }

  .page-title {
    font-size: 28px;
  }

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

  .header-inner {
    padding: 0 16px;
    min-height: 56px;
    position: relative;
  }

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--color-primary);
    box-shadow: 0 8px 16px rgba(26, 42, 58, 0.2);
  }

  .nav-list {
    display: none;
    flex-direction: column;
    padding: 8px 16px 16px;
    gap: 0;
  }

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

  .nav-item {
    width: 100%;
  }

  .nav-link {
    padding: 12px 16px;
    border-radius: var(--radius-sm);
  }

  .nav-item.is-current .nav-link,
  .nav-link.is-current {
    background-color: transparent;
    color: var(--color-accent);
  }

  .hero-section {
    padding: 32px 16px;
  }

  .hero-title {
    font-size: 26px;
  }

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

  .hero-actions {
    flex-direction: column;
    gap: 12px;
  }

  .hero-actions .btn-primary,
  .hero-actions .btn-secondary {
    text-align: center;
    width: 100%;
  }

  .section-block {
    padding: 36px 16px;
  }

  .section-head {
    flex-wrap: wrap;
    gap: 8px;
  }

  .topics-grid,
  .guide-entry-grid,
  .faq-preview-grid,
  .topic-grid-inner,
  .topic-detail-list {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .topic-cover img,
  .topic-card .topic-card-media img {
    height: 180px;
  }

  .channel-item {
    grid-template-columns: 1fr;
    gap: 16px;
    padding: 16px 0;
  }

  .channel-thumb img {
    height: 180px;
  }

  .channel-item:hover {
    padding-left: 0;
    padding-right: 0;
  }

  .step-item,
  .verify-step {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .step-number {
    width: 40px;
    height: 40px;
    font-size: 18px;
  }

  .footer-inner {
    padding: 36px 16px 20px;
  }

  .footer-links {
    grid-template-columns: 1fr 1fr;
    gap: 20px;
  }

  .feedback-card {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .feedback-image {
    height: 140px;
  }

  .feedback-links {
    grid-template-columns: 1fr 1fr;
  }

  .error-code {
    font-size: 56px;
  }

  .error-panel {
    padding: 32px 20px;
  }

  .content-media img {
    height: 180px;
  }

  .guide-entry-card {
    flex-direction: column;
    align-items: flex-start;
  }

  .breadcrumb {
    font-size: 13px;
    margin-bottom: 16px;
    flex-wrap: wrap;
  }
}

/* --- small mobile --- */
@media (max-width: 480px) {
  .brand-name {
    font-size: 17px;
  }

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

  .footer-links {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .channel-tags {
    gap: 8px;
  }

  .channel-tag {
    padding: 6px 14px;
    font-size: 13px;
  }

  .topic-detail-list {
    grid-template-columns: 1fr;
  }
}