:root {
  color-scheme: light;
  --color-bg: #ffffff;
  --color-surface: #f5f7fa;
  --color-panel: #ffffff;
  --color-text: #1f2329;
  --color-muted: #5f6773;
  --color-subtle: #86909c;
  --color-border: #e5e6eb;
  --color-primary: #165dff;
  --color-primary-strong: #0e42d2;
  --color-success: #00b42a;
  --color-warning: #ff7d00;
  --color-code-bg: #111827;
  --color-code-text: #e5e7eb;
  --shadow-soft: 0 12px 30px rgba(31, 35, 41, 0.08);
  --radius: 8px;
  --container: 1180px;
  --header-height: 68px;
  --article-font-scale: 0px;
}

[data-theme="dark"] {
  color-scheme: dark;
  --color-bg: #101318;
  --color-surface: #171b22;
  --color-panel: #1d222b;
  --color-text: #f2f3f5;
  --color-muted: #c9cdd4;
  --color-subtle: #a9aeb8;
  --color-border: #343b48;
  --color-primary: #4f8cff;
  --color-primary-strong: #76a6ff;
  --color-code-bg: #080d16;
  --color-code-text: #f3f4f6;
  --shadow-soft: 0 12px 30px rgba(0, 0, 0, 0.28);
}

* {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.75;
}

body.nav-open {
  overflow: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

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

img,
svg {
  max-width: 100%;
  display: block;
}

button,
input {
  font: inherit;
}

button {
  cursor: pointer;
}

:focus-visible {
  outline: 3px solid rgba(22, 93, 255, 0.25);
  outline-offset: 3px;
}

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 1000;
  transform: translateY(-150%);
  border-radius: 6px;
  background: var(--color-primary);
  color: #ffffff;
  padding: 8px 12px;
}

.skip-link:focus {
  transform: translateY(0);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.container {
  width: min(100% - 32px, var(--container));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  border-bottom: 1px solid var(--color-border);
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(16px);
}

[data-theme="dark"] .site-header {
  background: rgba(16, 19, 24, 0.94);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  height: 100%;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0;
  min-width: max-content;
  font-weight: 800;
  letter-spacing: 0;
  line-height: 0;
}

.brand-logo {
  width: auto;
  height: 34px;
  max-width: min(220px, 42vw);
}

[data-theme="dark"] .brand-logo {
  filter: brightness(0) invert(1);
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 8px;
  background: var(--color-primary);
  color: #ffffff;
  font-family: Consolas, "SFMono-Regular", Menlo, monospace;
  font-size: 17px;
  font-weight: 700;
}

.brand-text {
  display: flex;
  flex-direction: column;
  gap: 0;
  line-height: 1.15;
}

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

.brand-subtitle {
  color: var(--color-subtle);
  font-size: 11px;
  font-weight: 600;
}

.nav-toggle {
  display: none;
  flex: 0 0 40px;
  width: 40px;
  height: 40px;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  background: var(--color-panel);
  color: var(--color-text);
  padding: 0;
}

.nav-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  margin: 4px auto;
  background: currentColor;
  border-radius: 999px;
  transition: transform 160ms ease, opacity 160ms ease;
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

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

.nav-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

.site-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  flex: 1 1 auto;
  gap: 4px;
  min-width: 0;
}

.site-nav a {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 0 9px;
  border-radius: 8px;
  color: var(--color-muted);
  font-size: 13px;
  font-weight: 650;
  white-space: nowrap;
}

.site-nav a[aria-current="page"],
.site-nav a:hover {
  background: rgba(22, 93, 255, 0.08);
  color: var(--color-primary);
}

.header-actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
  min-width: 220px;
}

.search-box {
  position: relative;
  width: min(220px, 24vw);
}

.search-box input {
  width: 100%;
  height: 40px;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  background: var(--color-panel);
  color: var(--color-text);
  padding: 0 38px 0 12px;
}

.search-box input::placeholder {
  color: var(--color-subtle);
}

.search-icon {
  position: absolute;
  top: 50%;
  right: 12px;
  transform: translateY(-50%);
  color: var(--color-subtle);
  pointer-events: none;
}

.search-panel {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  display: none;
  width: min(360px, calc(100vw - 32px));
  max-height: 420px;
  overflow: auto;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  background: var(--color-panel);
  box-shadow: var(--shadow-soft);
  padding: 8px;
}

.search-panel.is-visible {
  display: grid;
  gap: 4px;
}

.search-result {
  display: block;
  border-radius: 6px;
  padding: 10px;
}

.search-result:hover {
  background: var(--color-surface);
}

.search-result strong {
  display: block;
  color: var(--color-text);
  line-height: 1.45;
}

.search-result span {
  display: block;
  color: var(--color-subtle);
  font-size: 12px;
  line-height: 1.5;
}

.icon-button {
  display: inline-grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  background: var(--color-panel);
  color: var(--color-text);
}

.icon-button:hover {
  border-color: rgba(22, 93, 255, 0.35);
  color: var(--color-primary);
}

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

.hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(340px, 0.9fr);
  align-items: center;
  gap: 42px;
  padding: 64px 0 48px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 14px;
  color: var(--color-primary);
  font-size: 13px;
  font-weight: 750;
}

.eyebrow::before {
  content: "";
  width: 24px;
  height: 2px;
  border-radius: 999px;
  background: currentColor;
}

.hero h1 {
  margin: 0;
  max-width: 780px;
  font-size: clamp(32px, 5vw, 56px);
  line-height: 1.14;
  letter-spacing: 0;
}

.hero p {
  margin: 18px 0 0;
  max-width: 700px;
  color: var(--color-muted);
  font-size: 18px;
  line-height: 1.8;
}

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

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 42px;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 0 16px;
  background: var(--color-panel);
  color: var(--color-text);
  font-weight: 750;
}

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

.button:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.button.primary:hover {
  background: var(--color-primary-strong);
  color: #ffffff;
}

.hero-visual {
  display: grid;
  gap: 14px;
}

.terminal-card,
.metric-strip,
.server-card {
  border: 1px solid var(--color-border);
  border-radius: 8px;
  background: var(--color-panel);
  box-shadow: var(--shadow-soft);
}

.terminal-card {
  overflow: hidden;
}

.terminal-bar {
  display: flex;
  align-items: center;
  gap: 6px;
  border-bottom: 1px solid var(--color-border);
  padding: 10px 12px;
}

.terminal-dot {
  width: 10px;
  height: 10px;
  border-radius: 999px;
  background: var(--color-border);
}

.terminal-dot:nth-child(1) {
  background: #ff5f56;
}

.terminal-dot:nth-child(2) {
  background: #ffbd2e;
}

.terminal-dot:nth-child(3) {
  background: #27c93f;
}

.terminal-body {
  margin: 0;
  background: var(--color-code-bg);
  color: var(--color-code-text);
  padding: 18px;
  font-family: Consolas, "SFMono-Regular", Menlo, monospace;
  font-size: 13px;
  line-height: 1.75;
  overflow: auto;
}

.metric-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  overflow: hidden;
}

.metric {
  background: var(--color-panel);
  padding: 14px;
}

.metric strong {
  display: block;
  font-size: 20px;
  line-height: 1.3;
}

.metric span {
  color: var(--color-subtle);
  font-size: 12px;
}

.section {
  padding: 52px 0;
}

.section.alt {
  background: var(--color-surface);
}

.section-header {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 22px;
}

.section-header h2,
.section-header h1 {
  margin: 0;
  font-size: clamp(24px, 3vw, 34px);
  line-height: 1.25;
  letter-spacing: 0;
}

.section-header p {
  margin: 8px 0 0;
  max-width: 680px;
  color: var(--color-muted);
}

.link-more {
  color: var(--color-primary);
  font-size: 14px;
  font-weight: 750;
  white-space: nowrap;
}

.content-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 28px;
}

.grid {
  display: grid;
  gap: 18px;
}

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

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

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

.article-card,
.review-card,
.tool-card,
.guide-card,
.sidebar-card,
.legal-card {
  border: 1px solid var(--color-border);
  border-radius: 8px;
  background: var(--color-panel);
}

.article-card,
.review-card,
.tool-card,
.guide-card {
  overflow: hidden;
  transition: transform 160ms ease, box-shadow 160ms ease, border-color 160ms ease;
}

.article-card:hover,
.review-card:hover,
.tool-card:hover,
.guide-card:hover {
  transform: translateY(-2px);
  border-color: rgba(22, 93, 255, 0.32);
  box-shadow: var(--shadow-soft);
}

.card-media {
  display: block;
  aspect-ratio: 16 / 9;
  background: var(--color-surface);
  overflow: hidden;
}

.card-media-text {
  position: relative;
  background: linear-gradient(135deg, #0f172a 0%, #172554 54%, #1d4ed8 100%);
  color: #ffffff;
}

.card-media-text::after {
  content: "";
  position: absolute;
  left: 18px;
  right: 18px;
  bottom: 18px;
  height: 4px;
  border-radius: 999px;
  background: linear-gradient(90deg, #fb923c, #facc15 40%, #60a5fa);
}

.text-cover {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  height: 100%;
  gap: 16px;
  padding: 18px;
}

.text-cover-kicker {
  display: inline-flex;
  align-items: center;
  align-self: flex-start;
  min-height: 28px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.08);
  color: #fdba74;
  padding: 0 10px;
  font-size: 12px;
  font-weight: 750;
  letter-spacing: 0.02em;
}

.text-cover-title {
  display: -webkit-box;
  overflow: hidden;
  color: #ffffff;
  font-size: clamp(18px, 2vw, 24px);
  font-weight: 800;
  line-height: 1.4;
  letter-spacing: 0;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 3;
}

.text-cover-meta {
  display: block;
  padding-right: 28px;
  color: rgba(226, 232, 240, 0.9);
  font-size: 12px;
  font-weight: 700;
  line-height: 1.5;
}

.card-media img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: center;
}

.card-body {
  padding: 18px;
}

.card-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 10px;
  color: var(--color-subtle);
  font-size: 12px;
}

.tag {
  display: inline-flex;
  align-items: center;
  min-height: 24px;
  border-radius: 999px;
  background: rgba(22, 93, 255, 0.08);
  color: var(--color-primary);
  padding: 0 9px;
  font-size: 12px;
  font-weight: 750;
}

.tag.success {
  background: rgba(0, 180, 42, 0.1);
  color: var(--color-success);
}

.tag.warning {
  background: rgba(255, 125, 0, 0.12);
  color: var(--color-warning);
}

.article-card h3,
.review-card h3,
.tool-card h3,
.guide-card h3 {
  margin: 0;
  font-size: 18px;
  line-height: 1.45;
  letter-spacing: 0;
}

.article-card p,
.review-card p,
.tool-card p,
.guide-card p {
  margin: 10px 0 0;
  color: var(--color-muted);
  font-size: 14px;
  line-height: 1.7;
}

.spec-list {
  display: grid;
  gap: 8px;
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
}

.spec-list li {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  border-top: 1px solid var(--color-border);
  padding-top: 8px;
  color: var(--color-muted);
  font-size: 13px;
}

.spec-list strong {
  color: var(--color-text);
}

.recommend-note {
  margin-top: 14px;
  border-left: 3px solid var(--color-success);
  background: rgba(0, 180, 42, 0.08);
  padding: 10px 12px;
  color: var(--color-muted);
  font-size: 13px;
}

.sidebar {
  display: grid;
  align-content: start;
  gap: 16px;
}

.sidebar .ad-slot {
  position: sticky;
  top: calc(var(--header-height) + 18px);
  align-self: start;
}

.sidebar-card {
  padding: 18px;
}

.sidebar-card h2,
.sidebar-card h3 {
  margin: 0 0 12px;
  font-size: 17px;
  line-height: 1.35;
}

.rank-list,
.plain-list,
.tag-cloud {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.rank-list {
  counter-reset: rank;
}

.rank-list a {
  display: grid;
  grid-template-columns: 26px minmax(0, 1fr);
  gap: 8px;
  color: var(--color-muted);
  font-size: 14px;
  line-height: 1.55;
}

.rank-list a::before {
  counter-increment: rank;
  content: counter(rank);
  display: grid;
  place-items: center;
  width: 22px;
  height: 22px;
  border-radius: 6px;
  background: var(--color-surface);
  color: var(--color-primary);
  font-size: 12px;
  font-weight: 800;
}

.plain-list a {
  color: var(--color-muted);
  font-size: 14px;
}

.tag-cloud {
  display: flex;
  flex-wrap: wrap;
}

.breadcrumb {
  color: var(--color-subtle);
  font-size: 14px;
  margin-bottom: 18px;
  max-width: 100%;
}

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

.article-shell {
  padding: 34px 0 54px;
}

.article-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 34px;
  align-items: start;
}

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

.article-header {
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 24px;
  margin-bottom: 28px;
}

.article-header h1 {
  margin: 0;
  font-size: clamp(30px, 4vw, 46px);
  line-height: 1.2;
  letter-spacing: 0;
}

.article-summary {
  margin: 16px 0 0;
  color: var(--color-muted);
  font-size: 18px;
  line-height: 1.85;
}

.article-info {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 16px;
  margin-top: 18px;
  color: var(--color-subtle);
  font-size: 13px;
}

.article-content {
  font-size: calc(16px + var(--article-font-scale));
  line-height: 1.9;
}

.article-top-promo {
  margin: 0 0 24px;
}

.article-content > *:first-child {
  margin-top: 0;
}

.article-content p {
  margin: 14px 0;
}

.article-content h2 {
  margin: 38px 0 14px;
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 10px;
  font-size: 26px;
  line-height: 1.35;
  letter-spacing: 0;
}

.article-content h3 {
  margin: 28px 0 10px;
  font-size: 20px;
  line-height: 1.45;
  letter-spacing: 0;
}

.article-content ul,
.article-content ol {
  padding-left: 1.4em;
}

.article-content li + li {
  margin-top: 6px;
}

.article-content strong {
  color: var(--color-text);
}

.article-content a {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.article-content :not(pre) > code {
  border-radius: 6px;
  background: rgba(22, 93, 255, 0.08);
  color: var(--color-text);
  padding: 2px 6px;
  font-family: Consolas, "SFMono-Regular", Menlo, monospace;
  font-size: 0.92em;
}

.article-content pre {
  margin: 22px 0;
  overflow: auto;
  border: 1px solid #2b3444;
  border-radius: 8px;
  background: var(--color-code-bg);
  color: var(--color-code-text);
  padding: 16px 18px;
}

.article-content pre code {
  display: block;
  min-width: max-content;
  font-family: Consolas, "SFMono-Regular", Menlo, monospace;
  font-size: 14px;
  line-height: 1.7;
  tab-size: 2;
}

.article-content table {
  display: block;
  width: 100%;
  max-width: 100%;
  overflow-x: auto;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  border-collapse: collapse;
  margin: 22px 0;
}

.article-content thead th,
.article-content tbody td {
  border-bottom: 1px solid var(--color-border);
  padding: 12px 14px;
  text-align: left;
  vertical-align: top;
}

.article-content thead th {
  background: var(--color-surface);
  font-weight: 800;
}

.article-content tbody tr:last-child td {
  border-bottom: 0;
}

.article-content figure {
  margin: 24px 0;
}

.article-content figcaption {
  color: var(--color-subtle);
  font-size: 13px;
}

.callout {
  border-left: 4px solid var(--color-primary);
  border-radius: 0 8px 8px 0;
  background: rgba(22, 93, 255, 0.08);
  padding: 14px 16px;
  color: var(--color-muted);
}

.callout.success {
  border-left-color: var(--color-success);
  background: rgba(0, 180, 42, 0.08);
}

.callout.warning {
  border-left-color: var(--color-warning);
  background: rgba(255, 125, 0, 0.1);
}

.compare-table {
  width: 100%;
  overflow-x: auto;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  margin: 22px 0;
}

.compare-table table {
  width: 100%;
  min-width: 680px;
  border-collapse: collapse;
}

.compare-table th,
.compare-table td {
  border-bottom: 1px solid var(--color-border);
  padding: 12px 14px;
  text-align: left;
  vertical-align: top;
}

.compare-table th {
  background: var(--color-surface);
  font-weight: 800;
}

.compare-table tr:last-child td {
  border-bottom: 0;
}

.code-wrap {
  overflow: hidden;
  border: 1px solid #2b3444;
  border-radius: 8px;
  background: var(--color-code-bg);
}

.code-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  border-bottom: 1px solid #2b3444;
  padding: 9px 12px;
  color: #cbd5e1;
  font-family: Consolas, "SFMono-Regular", Menlo, monospace;
  font-size: 12px;
}

.copy-code {
  border: 1px solid #475569;
  border-radius: 6px;
  background: #1f2937;
  color: #f8fafc;
  padding: 5px 10px;
  font-size: 12px;
}

.copy-code:hover {
  border-color: #93c5fd;
  color: #bfdbfe;
}

.code-block {
  margin: 0;
  max-width: 100%;
  overflow: auto;
  background: var(--color-code-bg);
  color: var(--color-code-text);
  padding: 14px 0;
  font-family: Consolas, "SFMono-Regular", Menlo, monospace;
  font-size: 14px;
  line-height: 1.7;
  tab-size: 2;
}

.code-block code {
  counter-reset: code-line;
  display: block;
  min-width: max-content;
}

.code-line {
  position: relative;
  display: block;
  min-height: 1.7em;
  padding: 0 18px 0 58px;
  white-space: pre;
}

.code-line::before {
  counter-increment: code-line;
  content: counter(code-line);
  position: absolute;
  left: 0;
  width: 42px;
  color: #64748b;
  text-align: right;
  user-select: none;
}

.article-tools {
  position: sticky;
  top: calc(var(--header-height) + 18px);
  display: grid;
  gap: 16px;
}

.toc a {
  display: block;
  border-left: 2px solid var(--color-border);
  padding: 5px 0 5px 10px;
  color: var(--color-muted);
  font-size: 13px;
  line-height: 1.5;
}

.toc a.toc-h3 {
  padding-left: 22px;
}

.toc a.is-active,
.toc a:hover {
  border-left-color: var(--color-primary);
  color: var(--color-primary);
}

.font-controls {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}

.font-controls button {
  min-height: 34px;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  background: var(--color-panel);
  color: var(--color-text);
}

.font-controls button:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.affiliate-box {
  border: 1px solid rgba(0, 180, 42, 0.35);
  border-radius: 8px;
  background: rgba(0, 180, 42, 0.08);
  padding: 16px;
}

.affiliate-box h3 {
  margin: 0 0 8px;
}

.affiliate-box p {
  margin: 0;
  color: var(--color-muted);
  font-size: 14px;
}

.ad-container {
  margin-top: 20px;
}

.ad-container-mobile {
  display: none;
}

.mobile-ad-container {
  display: none;
  margin-top: 18px;
}

.ad-slot {
  display: block;
}

.ad-slot + .ad-slot,
.article-footer .ad-slot {
  margin-top: 18px;
}

.ad-link,
.ad-placeholder {
  display: grid;
  gap: 10px;
  border: 1px dashed rgba(22, 93, 255, 0.36);
  border-radius: 8px;
  background: rgba(22, 93, 255, 0.06);
  padding: 16px;
}

.ad-slot-wide .ad-link,
.ad-slot-wide .ad-placeholder {
  grid-template-columns: auto minmax(0, 1fr);
  align-items: center;
}

.ad-link img {
  width: 100%;
  border-radius: 6px;
  object-fit: cover;
}

.ad-slot-wide .ad-link img {
  width: 180px;
  aspect-ratio: 16 / 9;
}

.ad-slot-image-only .ad-link {
  display: block;
  gap: 0;
  border: 0;
  background: transparent;
  padding: 0;
}

.ad-copy-mobile {
  display: none;
}

.ad-slot-image-only .ad-link img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: 10px;
  aspect-ratio: auto;
  object-fit: contain;
}

.ad-link strong,
.ad-placeholder strong {
  display: block;
  color: var(--color-text);
  line-height: 1.4;
}

.ad-link em,
.ad-placeholder p {
  display: block;
  margin: 4px 0 0;
  color: var(--color-muted);
  font-size: 13px;
  font-style: normal;
  line-height: 1.6;
}

.ad-placeholder span {
  display: inline-grid;
  place-items: center;
  width: 38px;
  height: 24px;
  border-radius: 6px;
  background: var(--color-primary);
  color: #ffffff;
  font-size: 12px;
  font-weight: 800;
}

.empty-state {
  border: 1px solid var(--color-border);
  border-radius: 8px;
  background: var(--color-panel);
  padding: 22px;
}

.empty-state h2 {
  margin: 0 0 8px;
  font-size: 20px;
}

.empty-state p {
  margin: 0;
  color: var(--color-muted);
}

.article-footer {
  margin-top: 38px;
  border-top: 1px solid var(--color-border);
  padding-top: 26px;
}

.summary-box {
  border: 1px solid var(--color-border);
  border-radius: 8px;
  background: var(--color-surface);
  padding: 18px;
}

.summary-box h2 {
  margin: 0 0 10px;
  font-size: 20px;
}

.summary-box ul {
  margin: 0;
  padding-left: 1.2em;
}

.category-hero {
  border-bottom: 1px solid var(--color-border);
  background: var(--color-surface);
  padding: 42px 0;
}

.category-hero h1 {
  margin: 0;
  font-size: clamp(30px, 4vw, 44px);
  line-height: 1.2;
  letter-spacing: 0;
}

.category-hero p {
  max-width: 760px;
  margin: 12px 0 0;
  color: var(--color-muted);
}

.filter-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

.filter-chip {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  background: var(--color-panel);
  color: var(--color-muted);
  padding: 0 12px;
  font-size: 14px;
}

.filter-chip.active,
.filter-chip:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.pagination {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.pagination-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 42px;
  min-height: 42px;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  background: var(--color-panel);
  color: var(--color-muted);
  padding: 0 14px;
  font-size: 14px;
  font-weight: 700;
}

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

.pagination-link.is-current {
  border-color: var(--color-primary);
  background: var(--color-primary);
  color: #ffffff;
}

.pagination-link-nav {
  min-width: 78px;
}

.legal-page {
  padding: 42px 0 64px;
}

.legal-card {
  max-width: 860px;
  padding: 28px;
}

.legal-card h1 {
  margin: 0 0 12px;
  font-size: 32px;
}

.legal-card h2 {
  margin: 28px 0 10px;
  font-size: 20px;
}

.site-footer {
  border-top: 1px solid var(--color-border);
  background: var(--color-surface);
  padding: 34px 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.2fr repeat(3, minmax(140px, 1fr));
  gap: 28px;
}

.footer-grid h2,
.footer-grid h3 {
  margin: 0 0 10px;
  font-size: 16px;
}

.footer-grid p,
.footer-grid a {
  color: var(--color-muted);
  font-size: 14px;
}

.footer-links {
  display: grid;
  gap: 7px;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  border-top: 1px solid var(--color-border);
  margin-top: 26px;
  padding-top: 18px;
  color: var(--color-subtle);
  font-size: 13px;
}

.back-top {
  position: fixed;
  right: 18px;
  bottom: 18px;
  z-index: 60;
  display: none;
  box-shadow: var(--shadow-soft);
}

.back-top.is-visible {
  display: inline-grid;
}

.reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 120;
  width: 0;
  height: 3px;
  background: var(--color-primary);
}

@media (max-width: 1080px) {
  .grid.four {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .content-layout,
  .article-layout {
    grid-template-columns: 1fr;
  }

  .sidebar,
  .article-tools {
    display: none;
  }

  .ad-container-desktop {
    display: none;
  }

  .ad-container-mobile {
    display: block;
  }

  .mobile-ad-container {
    display: block;
  }

  .mobile-ad-container .ad-slot-image-only .ad-link,
  .ad-container-mobile .ad-slot-image-only .ad-link,
  .article-footer .ad-slot-image-only .ad-link {
    border: 1px solid rgba(22, 93, 255, 0.16);
    border-radius: 16px;
    background: linear-gradient(180deg, rgba(22, 93, 255, 0.06), rgba(255, 255, 255, 0.98));
    padding: 14px;
    box-shadow: 0 14px 28px rgba(15, 23, 42, 0.08);
  }

  [data-theme="dark"] .mobile-ad-container .ad-slot-image-only .ad-link,
  [data-theme="dark"] .ad-container-mobile .ad-slot-image-only .ad-link,
  [data-theme="dark"] .article-footer .ad-slot-image-only .ad-link {
    border-color: rgba(96, 165, 250, 0.2);
    background: linear-gradient(180deg, rgba(59, 130, 246, 0.16), rgba(15, 23, 42, 0.96));
  }

  .mobile-ad-container .ad-slot-image-only .ad-link::before,
  .ad-container-mobile .ad-slot-image-only .ad-link::before,
  .article-footer .ad-slot-image-only .ad-link::before {
    content: "合作推荐";
    display: inline-flex;
    align-items: center;
    min-height: 24px;
    width: fit-content;
    border-radius: 999px;
    background: rgba(15, 23, 42, 0.92);
    color: #ffffff;
    padding: 0 10px;
    font-size: 11px;
    font-weight: 750;
    letter-spacing: 0.04em;
    margin-bottom: 12px;
  }

  [data-theme="dark"] .mobile-ad-container .ad-slot-image-only .ad-link::before,
  [data-theme="dark"] .ad-container-mobile .ad-slot-image-only .ad-link::before,
  [data-theme="dark"] .article-footer .ad-slot-image-only .ad-link::before {
    background: rgba(248, 250, 252, 0.14);
    color: #f8fafc;
  }

  .mobile-ad-container .ad-slot-image-only .ad-link img,
  .ad-container-mobile .ad-slot-image-only .ad-link img,
  .article-footer .ad-slot-image-only .ad-link img {
    border-radius: 12px;
    box-shadow: 0 10px 20px rgba(15, 23, 42, 0.08);
  }

  .mobile-ad-container .ad-copy-mobile,
  .ad-container-mobile .ad-copy-mobile,
  .article-footer .ad-copy-mobile {
    display: grid;
    gap: 4px;
    margin-top: 12px;
  }
}

@media (max-width: 1180px) and (min-width: 861px) {
  .header-actions {
    min-width: auto;
  }

  .header-actions .search-box {
    display: none;
  }

  .site-nav a {
    padding: 0 7px;
    font-size: 12px;
  }
}

@media (max-width: 860px) {
  :root {
    --header-height: 60px;
  }

  body {
    font-size: 15px;
  }

  .container {
    width: min(100% - 24px, var(--container));
  }

  .nav-toggle {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
  }

  .site-nav {
    position: fixed;
    top: var(--header-height);
    left: 12px;
    right: 12px;
    display: none;
    grid-template-columns: 1fr;
    gap: 4px;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    background: var(--color-panel);
    padding: 10px 12px 14px;
    box-shadow: var(--shadow-soft);
  }

  .site-nav.is-open {
    display: grid;
  }

  .site-nav a {
    min-height: 44px;
    border-radius: 6px;
  }

  .breadcrumb {
    overflow-x: auto;
    white-space: nowrap;
    scrollbar-width: none;
    -webkit-overflow-scrolling: touch;
  }

  .breadcrumb::-webkit-scrollbar {
    display: none;
  }

  .header-actions {
    min-width: auto;
  }

  .search-box {
    width: min(210px, 42vw);
  }

  .hero-inner {
    grid-template-columns: 1fr;
    gap: 28px;
    padding: 44px 0 32px;
  }

  .hero p {
    font-size: 16px;
  }

  .section {
    padding: 38px 0;
  }

  .section-header {
    display: block;
  }

  .link-more {
    display: inline-block;
    margin-top: 12px;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 640px) {
  .brand-logo {
    height: 30px;
    max-width: min(188px, 56vw);
  }

  .text-cover {
    padding: 16px;
  }

  .text-cover-title {
    font-size: 19px;
  }

  .brand-subtitle,
  .header-actions .search-box {
    display: none;
  }

  .grid.two,
  .grid.three,
  .grid.four {
    grid-template-columns: 1fr;
  }

  .metric-strip {
    grid-template-columns: 1fr;
  }

  .card-body,
  .sidebar-card,
  .legal-card {
    padding: 16px;
  }

  .article-shell {
    padding-top: 24px;
  }

  .article-summary {
    font-size: 16px;
  }

  .article-content h2 {
    font-size: 23px;
  }

  .code-block {
    font-size: 13px;
  }

  .code-line {
    padding-left: 50px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
  }

  .footer-bottom {
    display: block;
  }

  .ad-slot-wide .ad-link,
  .ad-slot-wide .ad-placeholder {
    grid-template-columns: 1fr;
  }

  .ad-slot-wide .ad-link img {
    width: 100%;
  }
}