/* SEVEN C 文档站 — GitBook 风格（参考 Cherry Studio 文档布局） */
* { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --doc-bg: #ffffff;
  --doc-sidebar: #f7f8fa;
  --doc-border: #e8eaed;
  --doc-text: #1a1a1a;
  --doc-mute: #5f6368;
  --doc-faint: #80868b;
  --doc-accent: #ff6b35;
  --doc-accent-soft: rgba(255, 107, 53, 0.1);
  --doc-banner: linear-gradient(135deg, #fff5f0 0%, #ffe8dc 100%);
  --doc-sidebar-w: 280px;
  --doc-toc-w: 220px;
  --doc-top-h: 56px;
  --doc-radius: 8px;
  --doc-font: 'Inter', -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--doc-font);
  font-size: 15px;
  line-height: 1.65;
  color: var(--doc-text);
  background: var(--doc-bg);
  -webkit-font-smoothing: antialiased;
}

a { color: var(--doc-accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ========== 顶栏 ========== */
.doc-top {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--doc-top-h);
  z-index: 100;
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 0 20px;
  background: var(--doc-bg);
  border-bottom: 1px solid var(--doc-border);
}
.doc-top-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
  color: var(--doc-text);
  text-decoration: none !important;
}
.doc-top-brand-mark {
  display: inline-flex;
  align-items: center;
  padding: 0;
  background: transparent;
  border: 0;
  border-radius: 0;
}
.doc-top-brand img {
  height: 22px;
  width: auto;
  display: block;
  filter: none;
}
.doc-top-search {
  flex: 1;
  max-width: 420px;
  margin: 0 auto;
  position: relative;
}
.doc-top-search input {
  width: 100%;
  height: 36px;
  padding: 0 14px 0 36px;
  border: 1px solid var(--doc-border);
  border-radius: 999px;
  font: inherit;
  font-size: 14px;
  background: var(--doc-sidebar);
  outline: none;
}
.doc-top-search input:focus {
  border-color: var(--doc-accent);
  background: #fff;
}
.doc-top-search svg {
  position: absolute;
  left: 12px;
  top: 10px;
  width: 16px;
  height: 16px;
  opacity: 0.45;
}
.doc-top-links {
  display: flex;
  align-items: center;
  gap: 20px;
  font-size: 14px;
  flex-shrink: 0;
}
.doc-top-links a { color: var(--doc-mute); text-decoration: none; }
.doc-top-links a:hover { color: var(--doc-accent); }
.doc-menu-btn {
  display: none;
  padding: 8px;
  border: 1px solid var(--doc-border);
  border-radius: var(--doc-radius);
  background: #fff;
}

/* ========== 三栏骨架 ========== */
.doc-shell {
  display: flex;
  padding-top: var(--doc-top-h);
  min-height: 100vh;
}

.doc-sidebar {
  position: fixed;
  top: var(--doc-top-h);
  left: 0;
  width: var(--doc-sidebar-w);
  height: calc(100vh - var(--doc-top-h));
  overflow-y: auto;
  background: var(--doc-sidebar);
  border-right: 1px solid var(--doc-border);
  padding: 20px 0 40px;
  z-index: 50;
}
.doc-sidebar::-webkit-scrollbar { width: 6px; }
.doc-sidebar::-webkit-scrollbar-thumb { background: #d0d4d9; border-radius: 3px; }

.doc-nav-group { margin-bottom: 20px; }
.doc-nav-group-title {
  padding: 0 20px 8px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--doc-faint);
}
.doc-nav-link {
  display: block;
  padding: 6px 20px;
  font-size: 14px;
  color: var(--doc-mute);
  text-decoration: none !important;
  border-left: 3px solid transparent;
}
.doc-nav-link:hover { color: var(--doc-text); background: rgba(0, 0, 0, 0.03); }
.doc-nav-link.is-active {
  color: var(--doc-accent);
  font-weight: 600;
  border-left-color: var(--doc-accent);
  background: var(--doc-accent-soft);
}
.doc-nav-link.is-hidden { display: none; }

.doc-main {
  flex: 1;
  margin-left: var(--doc-sidebar-w);
  margin-right: var(--doc-toc-w);
  min-width: 0;
}
.doc-content {
  max-width: 780px;
  margin: 0 auto;
  padding: 40px 48px 80px;
}

.doc-toc {
  position: fixed;
  top: var(--doc-top-h);
  right: 0;
  width: var(--doc-toc-w);
  height: calc(100vh - var(--doc-top-h));
  overflow-y: auto;
  padding: 28px 16px 40px;
  border-left: 1px solid var(--doc-border);
  font-size: 13px;
}
.doc-toc-title {
  font-size: 12px;
  font-weight: 600;
  color: var(--doc-faint);
  margin-bottom: 12px;
}
.doc-toc a {
  display: block;
  padding: 4px 0;
  color: var(--doc-mute);
  text-decoration: none !important;
  line-height: 1.4;
}
.doc-toc a:hover { color: var(--doc-accent); }
.doc-toc a.is-active { color: var(--doc-accent); font-weight: 600; }
.doc-toc a.toc-h3 { padding-left: 12px; font-size: 12px; }

.doc-feedback {
  margin-top: 32px;
  padding-top: 20px;
  border-top: 1px solid var(--doc-border);
}
.doc-feedback p { font-size: 13px; color: var(--doc-mute); margin-bottom: 10px; }
.doc-feedback-btns { display: flex; gap: 8px; }
.doc-feedback-btns button {
  width: 36px;
  height: 36px;
  border: 1px solid var(--doc-border);
  border-radius: var(--doc-radius);
  background: #fff;
  font-size: 18px;
  cursor: pointer;
}
.doc-feedback-btns button:hover { border-color: var(--doc-accent); }

/* ========== 正文排版 ========== */
.doc-content h1 {
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
  line-height: 1.2;
}
.doc-content h2 {
  font-size: 1.35rem;
  font-weight: 700;
  margin: 48px 0 16px;
  padding-top: 8px;
  scroll-margin-top: calc(var(--doc-top-h) + 16px);
}
.doc-content h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin: 28px 0 10px;
  scroll-margin-top: calc(var(--doc-top-h) + 16px);
}
.doc-content p { margin-bottom: 14px; color: var(--doc-text); }
.doc-content ul, .doc-content ol {
  margin: 0 0 16px 1.25em;
  color: var(--doc-mute);
}
.doc-content li { margin-bottom: 6px; }
.doc-content strong { color: var(--doc-text); font-weight: 600; }

.doc-banner {
  margin: 0 0 28px;
  padding: 28px 32px;
  border-radius: var(--doc-radius);
  background: var(--doc-banner);
  border: 1px solid rgba(255, 107, 53, 0.15);
}
.doc-banner img {
  display: block;
  height: 32px;
  width: auto;
  margin-bottom: 12px;
  background: transparent;
  border: 0;
  filter: none;
}
.doc-banner p { margin: 0; color: var(--doc-mute); font-size: 15px; }

.doc-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 24px;
}
.doc-meta span {
  font-size: 13px;
  padding: 4px 10px;
  border-radius: 999px;
  background: var(--doc-sidebar);
  color: var(--doc-mute);
}

.doc-figure {
  margin: 20px 0 28px;
  border: 1px solid var(--doc-border);
  border-radius: var(--doc-radius);
  overflow: hidden;
  background: #0a0a0a;
}
.doc-figure img { width: 100%; display: block; }
.doc-figure figcaption {
  padding: 10px 14px;
  font-size: 13px;
  color: var(--doc-mute);
  background: var(--doc-sidebar);
  border-top: 1px solid var(--doc-border);
}

.doc-figure-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin: 20px 0 28px;
}
.doc-figure-row .doc-figure { margin: 0; }
@media (max-width: 720px) {
  .doc-figure-row { grid-template-columns: 1fr; }
}

.doc-callout {
  margin: 16px 0;
  padding: 14px 16px;
  border-radius: var(--doc-radius);
  border-left: 4px solid var(--doc-accent);
  background: var(--doc-accent-soft);
  font-size: 14px;
  color: var(--doc-mute);
}
.doc-callout strong { color: var(--doc-text); }

.doc-table-wrap { overflow-x: auto; margin: 16px 0 24px; }
.doc-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}
.doc-table th,
.doc-table td {
  padding: 10px 12px;
  border: 1px solid var(--doc-border);
  text-align: left;
}
.doc-table th { background: var(--doc-sidebar); font-weight: 600; }
.doc-table code {
  font-size: 13px;
  background: var(--doc-sidebar);
  padding: 2px 6px;
  border-radius: 4px;
}

.doc-card-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin: 16px 0 24px;
}
.doc-card {
  padding: 14px 16px;
  border: 1px solid var(--doc-border);
  border-radius: var(--doc-radius);
  background: #fff;
}
.doc-card h4 { font-size: 14px; margin-bottom: 6px; }
.doc-card p { font-size: 13px; margin: 0; color: var(--doc-mute); }

.doc-faq details {
  margin-bottom: 10px;
  border: 1px solid var(--doc-border);
  border-radius: var(--doc-radius);
  overflow: hidden;
}
.doc-faq summary {
  padding: 14px 16px;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  background: var(--doc-sidebar);
}
.doc-faq summary::-webkit-details-marker { display: none; }
.doc-faq details[open] summary { border-bottom: 1px solid var(--doc-border); }
.doc-faq .doc-faq-body {
  padding: 14px 16px;
  font-size: 14px;
  color: var(--doc-mute);
}

.doc-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.4);
  z-index: 40;
}

@media (max-width: 1100px) {
  .doc-toc { display: none; }
  .doc-main { margin-right: 0; }
}
@media (max-width: 900px) {
  .doc-menu-btn { display: block; }
  .doc-sidebar {
    transform: translateX(-100%);
    transition: transform 0.2s;
    box-shadow: 4px 0 24px rgba(0, 0, 0, 0.12);
  }
  .doc-sidebar.is-open { transform: translateX(0); }
  .doc-overlay.is-open { display: block; }
  .doc-main { margin-left: 0; }
  .doc-content { padding: 28px 20px 60px; }
  .doc-card-grid { grid-template-columns: 1fr; }
  .doc-top-search { max-width: 200px; }
}