:root {
  --bg: #f4f7fb;
  --surface: #ffffff;
  --surface-alt: #eef3ff;
  --text: #1f2937;
  --muted: #6b7280;
  --border: #d7dfeb;
  --primary: #4f46e5;
  --primary-dark: #312e81;
  --success: #047857;
  --danger: #b91c1c;
  --shadow: 0 20px 60px rgba(15, 23, 42, 0.08);
  --radius: 18px;
  --content-width: 1240px;
  --page-grad-start: #eef2ff;
  --topbar-bg: rgba(255, 255, 255, 0.88);
  --topbar-border: rgba(215, 223, 235, 0.9);
  --card-border: rgba(215, 223, 235, 0.8);
  --badge-bg: rgba(79, 70, 229, 0.1);
  --doc-bg: rgba(255, 255, 255, 0.9);
  --doc-heading: #111827;
  --pre-bg: #0f172a;
  --pre-text: #e5e7eb;
  --inline-code-bg: rgba(79, 70, 229, 0.08);
  --blockquote-bg: rgba(79, 70, 229, 0.06);
  --table-head-bg: rgba(79, 70, 229, 0.06);
  --image-border: rgba(215, 223, 235, 0.9);
  --image-shadow: 0 16px 38px rgba(15, 23, 42, 0.08);
  --input-bg: #ffffff;
  --button-text: #ffffff;
  --ghost-bg: rgba(79, 70, 229, 0.1);
  --danger-bg: rgba(185, 28, 28, 0.1);
  --success-bg: rgba(4, 120, 87, 0.1);
  --error-bg: rgba(185, 28, 28, 0.1);
  --modal-backdrop: rgba(15, 23, 42, 0.74);
  --modal-shadow: 0 30px 90px rgba(15, 23, 42, 0.35);
  --card-hover-shadow: 0 28px 70px rgba(15, 23, 42, 0.12);
  --footer-bg: rgba(255, 255, 255, 0.72);
  --footer-border: rgba(215, 223, 235, 0.9);
  color-scheme: light;
}

html[data-theme='dark'],
body[data-theme='dark'],
body.theme-dark {
  --bg: #0b1220;
  --surface: #111827;
  --surface-alt: #162032;
  --text: #e5e7eb;
  --muted: #94a3b8;
  --border: #243244;
  --primary: #818cf8;
  --primary-dark: #c7d2fe;
  --success: #34d399;
  --danger: #f87171;
  --shadow: 0 24px 60px rgba(0, 0, 0, 0.35);
  --page-grad-start: #111827;
  --topbar-bg: rgba(17, 24, 39, 0.88);
  --topbar-border: rgba(36, 50, 68, 0.9);
  --card-border: rgba(36, 50, 68, 0.9);
  --badge-bg: rgba(129, 140, 248, 0.14);
  --doc-bg: rgba(17, 24, 39, 0.92);
  --doc-heading: #f8fafc;
  --pre-bg: #020617;
  --pre-text: #e2e8f0;
  --inline-code-bg: rgba(129, 140, 248, 0.14);
  --blockquote-bg: rgba(129, 140, 248, 0.1);
  --table-head-bg: rgba(129, 140, 248, 0.12);
  --image-border: rgba(51, 65, 85, 0.9);
  --image-shadow: 0 16px 38px rgba(0, 0, 0, 0.35);
  --input-bg: #0f172a;
  --button-text: #f8fafc;
  --ghost-bg: rgba(129, 140, 248, 0.16);
  --danger-bg: rgba(248, 113, 113, 0.18);
  --success-bg: rgba(52, 211, 153, 0.16);
  --error-bg: rgba(248, 113, 113, 0.18);
  --modal-backdrop: rgba(2, 6, 23, 0.88);
  --modal-shadow: 0 30px 90px rgba(0, 0, 0, 0.55);
  --card-hover-shadow: 0 28px 70px rgba(0, 0, 0, 0.38);
  --footer-bg: rgba(17, 24, 39, 0.78);
  --footer-border: rgba(36, 50, 68, 0.9);
  color-scheme: dark;
}

@media (prefers-color-scheme: dark) {
  html:not([data-theme='light']):not([data-theme='dark']) {
    --bg: #0b1220;
    --surface: #111827;
    --surface-alt: #162032;
    --text: #e5e7eb;
    --muted: #94a3b8;
    --border: #243244;
    --primary: #818cf8;
    --primary-dark: #c7d2fe;
    --success: #34d399;
    --danger: #f87171;
    --shadow: 0 24px 60px rgba(0, 0, 0, 0.35);
    --page-grad-start: #111827;
    --topbar-bg: rgba(17, 24, 39, 0.88);
    --topbar-border: rgba(36, 50, 68, 0.9);
    --card-border: rgba(36, 50, 68, 0.9);
    --badge-bg: rgba(129, 140, 248, 0.14);
    --doc-bg: rgba(17, 24, 39, 0.92);
    --doc-heading: #f8fafc;
    --pre-bg: #020617;
    --pre-text: #e2e8f0;
    --inline-code-bg: rgba(129, 140, 248, 0.14);
    --blockquote-bg: rgba(129, 140, 248, 0.1);
    --table-head-bg: rgba(129, 140, 248, 0.12);
    --image-border: rgba(51, 65, 85, 0.9);
    --image-shadow: 0 16px 38px rgba(0, 0, 0, 0.35);
    --input-bg: #0f172a;
    --button-text: #f8fafc;
    --ghost-bg: rgba(129, 140, 248, 0.16);
    --danger-bg: rgba(248, 113, 113, 0.18);
    --success-bg: rgba(52, 211, 153, 0.16);
    --error-bg: rgba(248, 113, 113, 0.18);
    --modal-backdrop: rgba(2, 6, 23, 0.88);
    --modal-shadow: 0 30px 90px rgba(0, 0, 0, 0.55);
    --card-hover-shadow: 0 28px 70px rgba(0, 0, 0, 0.38);
    --footer-bg: rgba(17, 24, 39, 0.78);
    --footer-border: rgba(36, 50, 68, 0.9);
    color-scheme: dark;
  }
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  font-family: "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
  color: var(--text);
  background: linear-gradient(180deg, var(--page-grad-start) 0%, var(--bg) 180px, var(--bg) 100%);
}

body.has-modal {
  overflow: hidden;
}

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

a:hover {
  text-decoration: underline;
}

code,
pre,
kbd {
  font-family: "Cascadia Code", Consolas, monospace;
}

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

.topbar {
  position: sticky;
  top: 0;
  z-index: 40;
  background: var(--topbar-bg);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--topbar-border);
}

.topbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 68px;
  gap: 16px;
}

.brand {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--primary-dark);
}

.topnav {
  display: flex;
  align-items: center;
  gap: 18px;
  font-size: 0.96rem;
}

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

.site-footer {
  padding: 2rem 0;
  border-top: 1px solid var(--footer-border);
  background: var(--footer-bg);
  backdrop-filter: blur(12px);
}

.site-footer__inner {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
}

.site-footer__inner a {
  color: var(--muted);
  text-decoration: none;
  font-size: 13px;
  transition: color 0.3s ease;
}

.site-footer__inner a:hover {
  color: var(--text);
  text-decoration: none;
}

.theme-toggle {
  gap: 8px;
  padding: 0 14px;
  white-space: nowrap;
}

.theme-toggle__icon {
  font-size: 1rem;
}

.hero {
  padding: 52px 0 20px;
}

.hero__badge,
.article-card__label,
.doc-header__eyebrow {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  padding: 0 14px;
  border-radius: 999px;
  background: var(--badge-bg);
  color: var(--primary-dark);
  font-size: 0.88rem;
  font-weight: 700;
}

.hero h1 {
  margin: 18px 0 14px;
  font-size: clamp(2rem, 4vw, 3.4rem);
  line-height: 1.15;
}

.hero p {
  margin: 0;
  max-width: 760px;
  color: var(--muted);
  font-size: 1.04rem;
}

.article-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
  padding: 16px 0 48px;
}

.home-shell {
  padding: 32px 0 48px;
}

.home-shell .article-grid {
  padding: 0;
}

.article-card,
.card,
.doc-panel {
  background: var(--surface);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.article-card {
  display: block;
  padding: 24px;
  color: inherit;
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}

.article-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--card-hover-shadow);
  text-decoration: none;
}

.article-card h2 {
  margin: 0 0 12px;
  font-size: 1.22rem;
}

.article-card p,
.muted,
.toc-empty,
.empty-state p,
.doc-header__meta,
.doc-panel .toc-list a,
.admin-header p,
.upload-card p {
  color: var(--muted);
}

.article-card__meta,
.doc-header__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  font-size: 0.92rem;
}

.empty-state,
.not-found-card,
.auth-card,
.upload-card,
.table-card,
.admin-header {
  padding: 28px;
}

.empty-state,
.not-found-card {
  text-align: center;
}

.doc-shell {
  display: grid;
  grid-template-columns: minmax(230px, 280px) minmax(0, 1fr);
  gap: 24px;
  padding: 32px 0 48px;
}

.doc-sidebar {
  display: flex;
  flex-direction: column;
  gap: 18px;
  position: sticky;
  top: 88px;
  align-self: start;
  max-height: calc(100vh - 104px);
  overflow-y: auto;
  padding-right: 4px;
}

.doc-panel {
  padding: 20px;
  position: static;
}

.doc-panel h2 {
  margin: 0 0 16px;
  font-size: 1rem;
}

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

.toc-link {
  line-height: 1.45;
}

.toc-link--level-2 {
  padding-left: 12px;
}

.toc-link--level-3,
.toc-link--level-4,
.toc-link--level-5,
.toc-link--level-6 {
  padding-left: 24px;
}

.toc-list--compact a {
  font-size: 0.95rem;
}

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

.doc-header {
  padding: 8px 0 22px;
}

.doc-header h1 {
  margin: 14px 0 14px;
  font-size: clamp(2rem, 4vw, 3rem);
  line-height: 1.16;
}

.doc-content {
  padding: 34px;
  background: var(--doc-bg);
  border: 1px solid var(--card-border);
  border-radius: 24px;
  box-shadow: var(--shadow);
}

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

.doc-content h1,
.doc-content h2,
.doc-content h3,
.doc-content h4,
.doc-content h5,
.doc-content h6 {
  color: var(--doc-heading);
  scroll-margin-top: 88px;
}

.doc-content h2 {
  margin-top: 40px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}

.doc-content p,
.doc-content li,
.doc-content blockquote,
.doc-content td,
.doc-content th {
  line-height: 1.85;
  font-size: 1rem;
}

.doc-content pre {
  overflow-x: auto;
  padding: 18px;
  border-radius: 18px;
  background: var(--pre-bg);
  color: var(--pre-text);
}

.doc-content code {
  padding: 0.18em 0.45em;
  border-radius: 8px;
  background: var(--inline-code-bg);
}

.doc-content pre code {
  padding: 0;
  background: transparent;
  color: inherit;
}

.doc-content blockquote {
  margin: 24px 0;
  padding: 14px 18px;
  border-left: 4px solid var(--primary);
  background: var(--blockquote-bg);
  border-radius: 0 16px 16px 0;
}

.doc-content ul,
.doc-content ol {
  padding-left: 24px;
}

.doc-content hr {
  margin: 34px 0;
  border: 0;
  border-top: 1px solid var(--border);
}

.table-wrapper {
  overflow-x: auto;
}

.doc-content table,
.table-card table {
  width: 100%;
  border-collapse: collapse;
}

.doc-content th,
.doc-content td,
.table-card th,
.table-card td {
  padding: 12px 14px;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}

.doc-content th,
.table-card th {
  background: var(--table-head-bg);
  text-align: left;
}

.doc-image,
.doc-inline-image {
  display: block;
  max-width: min(100%, 420px);
  margin: 24px auto;
}

.doc-image img,
.doc-inline-image {
  width: 100%;
  height: auto;
  border-radius: 18px;
  border: 1px solid var(--image-border);
  box-shadow: var(--image-shadow);
  cursor: zoom-in;
  transition: transform 0.18s ease;
}

.doc-image img:hover,
.doc-inline-image:hover {
  transform: scale(1.015);
}

.doc-image figcaption {
  margin-top: 10px;
  text-align: center;
  font-size: 0.92rem;
  color: var(--muted);
}

.admin-shell,
.auth-shell,
.not-found-shell {
  padding: 32px 0 48px;
}

.admin-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
  margin: 22px 0;
}

.admin-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.upload-card,
.auth-card {
  display: grid;
  gap: 14px;
}

.auth-card {
  max-width: 460px;
  margin: 0 auto;
}

label {
  display: grid;
  gap: 8px;
}

input,
button {
  font: inherit;
}

input[type="text"],
input[type="password"],
input[type="file"],
input:not([type]) {
  width: 100%;
  min-height: 46px;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--input-bg);
  color: var(--text);
}

button,
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 0 16px;
  border: 0;
  border-radius: 12px;
  background: var(--primary);
  color: var(--button-text);
  font-weight: 700;
  cursor: pointer;
}

button:hover,
.button:hover {
  text-decoration: none;
  filter: brightness(1.05);
}

.button--ghost {
  background: var(--ghost-bg);
  color: var(--primary-dark);
}

.button--danger {
  background: var(--danger-bg);
  color: var(--danger);
}

.inline-form {
  display: inline-flex;
  margin: 0;
}

.password-form {
  display: grid;
  gap: 8px;
  min-width: 220px;
}

.password-form .button {
  width: 100%;
}

.actions-cell {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.alert {
  margin-bottom: 18px;
  padding: 14px 16px;
  border-radius: 14px;
}

.alert-success {
  background: var(--success-bg);
  color: var(--success);
}

.alert-error {
  background: var(--error-bg);
  color: var(--danger);
}

.image-modal {
  position: fixed;
  inset: 0;
  z-index: 80;
}

.image-modal__backdrop {
  position: absolute;
  inset: 0;
  background: var(--modal-backdrop);
}

.image-modal__dialog {
  position: relative;
  display: grid;
  place-items: center;
  width: min(92vw, 1200px);
  height: min(88vh, 900px);
  margin: min(6vh, 36px) auto;
  padding: 18px;
}

.image-modal__dialog img {
  max-width: 100%;
  max-height: 100%;
  border-radius: 22px;
  box-shadow: var(--modal-shadow);
  cursor: zoom-out;
}

body,
.topbar,
.article-card,
.card,
.doc-panel,
.doc-content,
input,
button,
.button,
.site-footer {
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

@media (max-width: 960px) {
  .doc-shell {
    grid-template-columns: 1fr;
  }

  .doc-sidebar {
    order: 2;
    position: static;
    max-height: none;
    overflow: visible;
    padding-right: 0;
  }

  .doc-content {
    padding: 24px;
  }

  .admin-header {
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (max-width: 640px) {
  .container {
    width: min(calc(100% - 20px), var(--content-width));
  }

  .topbar-inner,
  .topnav {
    flex-direction: column;
    align-items: flex-start;
    padding: 10px 0;
  }

  .theme-toggle {
    width: 100%;
  }

  .doc-content,
  .table-card,
  .upload-card,
  .auth-card,
  .admin-header,
  .not-found-card {
    padding: 20px;
  }

  .table-card {
    overflow-x: auto;
  }
}

@media (max-width: 600px) {
  .site-footer__inner {
    flex-direction: column;
    gap: 10px;
  }
}