/* ============================================================
   ValueIn · 价值研究所 —— 全站样式
   极简文档式 · 暖纸底色 · 墨色正文 · 深红点缀
   ============================================================ */

:root {
  --paper: #faf8f4;
  --paper-deep: #f3efe8;
  --ink: #1f1f1f;
  --ink-soft: #4a4a48;
  --ink-faint: #8a8680;
  --accent: #9e1b32;
  --accent-soft: rgba(158, 27, 50, 0.08);
  --line: #e3ddd2;
  --line-dark: #d3ccbf;
  --sidebar-w: 240px;
  --content-max: 760px;
  --serif: "Songti SC", "Noto Serif CJK SC", "STSong", serif;
  --sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.8;
}

a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.15s ease, color 0.15s ease;
}
a:hover { border-bottom-color: var(--accent); }

h1, h2, h3, h4 {
  font-family: var(--serif);
  font-weight: 700;
  line-height: 1.4;
  color: var(--ink);
}

/* ============ 布局骨架 ============ */

.layout {
  display: flex;
  min-height: 100vh;
}

/* ---- 侧栏 ---- */
.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  width: var(--sidebar-w);
  height: 100vh;
  padding: 48px 28px 32px;
  border-right: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  background: var(--paper);
  z-index: 40;
}

.site-name {
  font-family: var(--serif);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--ink);
  border: none;
  margin-bottom: 4px;
}
.site-name:hover { color: var(--accent); }

.site-tag {
  font-size: 12px;
  color: var(--ink-faint);
  letter-spacing: 0.2em;
  margin-bottom: 40px;
}

.side-nav {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
}
.nav-list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.nav-list > li { margin-bottom: 2px; }
.nav-link {
  display: block;
  padding: 8px 10px;
  font-size: 14px;
  color: var(--ink-soft);
  border: none;
  border-left: 2px solid transparent;
  transition: color 0.15s ease, border-color 0.15s ease, background 0.15s ease;
}
.nav-link:hover {
  color: var(--accent);
  background: var(--accent-soft);
}
.nav-link.active {
  color: var(--accent);
  border-left-color: var(--accent);
  background: var(--accent-soft);
}
.nav-code {
  font-size: 12px;
  color: var(--ink-faint);
  margin-left: 6px;
  letter-spacing: 0.04em;
}

/* 二级导航 */
.nav-group-head {
  display: flex;
  align-items: stretch;
}
.nav-group-head .nav-link {
  flex: 1;
  min-width: 0;
}
.nav-toggle {
  flex: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  background: none;
  border: none;
  border-left: 2px solid transparent;
  color: var(--ink-faint);
  cursor: pointer;
  padding: 0;
}
.nav-toggle svg { transition: transform 0.2s ease; }
.nav-toggle[aria-expanded="true"] svg { transform: rotate(180deg); }
.nav-toggle:hover { color: var(--accent); }
.nav-toggle:focus-visible { outline: 2px solid var(--accent); outline-offset: -2px; }
.sub-nav {
  list-style: none;
  margin: 2px 0 10px 11px;
  padding: 0 0 0 12px;
  border-left: 1px solid var(--line-dark);
}
.sub-nav a {
  display: block;
  padding: 4px 10px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-faint);
  border: none;
  border-radius: 0 3px 3px 0;
  transition: color 0.15s ease, background 0.15s ease;
}
.sub-nav a:hover {
  color: var(--accent);
  background: var(--accent-soft);
}
.sub-nav a.active {
  color: var(--accent);
  font-weight: 600;
  background: var(--accent-soft);
}

.side-foot {
  font-size: 12px;
  color: var(--ink-faint);
  line-height: 1.7;
  border-top: 1px solid var(--line);
  padding-top: 16px;
}

/* ---- 主内容区 ---- */
.main {
  flex: 1;
  margin-left: var(--sidebar-w);
  min-width: 0;
}

.content {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 64px 40px 96px;
}

/* ============ 顶部汉堡（移动端） ============ */
.topbar {
  display: none;
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--paper);
  border-bottom: 1px solid var(--line);
  padding: 12px 20px;
  align-items: center;
  justify-content: space-between;
}
.topbar .topbar-name {
  font-family: var(--serif);
  font-weight: 700;
  font-size: 17px;
  color: var(--ink);
  border: none;
}
.menu-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: none;
  border: 1px solid var(--line-dark);
  border-radius: 4px;
  cursor: pointer;
  padding: 0;
}
.menu-btn svg { stroke: var(--ink); }
.menu-btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.sidebar-mask {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(31, 31, 31, 0.35);
  z-index: 39;
}
.sidebar-mask.show { display: block; }

/* ============ 首页 ============ */

.hero { margin-bottom: 56px; }
.hero-kicker {
  font-size: 13px;
  letter-spacing: 0.3em;
  color: var(--accent);
  margin: 0 0 12px;
}
.hero h1 {
  font-size: 34px;
  margin: 0 0 20px;
  letter-spacing: 0.04em;
}
.hero p {
  color: var(--ink-soft);
  margin: 0 0 12px;
}
.hero .hero-note {
  font-size: 14px;
  color: var(--ink-faint);
}

.section-title {
  font-size: 22px;
  margin: 0 0 8px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line-dark);
}
.section-sub {
  font-size: 13px;
  color: var(--ink-faint);
  margin: 0 0 28px;
}

/* ---- 股票导览卡 ---- */
.card-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}
.stock-card {
  display: block;
  border: none;
  border-top: 1px solid var(--line);
  padding: 28px 4px;
  color: var(--ink);
  transition: background 0.15s ease;
}
.stock-card:last-child { border-bottom: 1px solid var(--line); }
.stock-card:hover { background: var(--paper-deep); }
.stock-card .card-head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 6px;
}
.stock-card .card-name {
  font-family: var(--serif);
  font-size: 21px;
  font-weight: 700;
}
.stock-card .card-code {
  font-size: 13px;
  color: var(--accent);
  letter-spacing: 0.06em;
}
.stock-card .card-oneliner {
  font-size: 14px;
  color: var(--ink-soft);
  margin: 0 0 14px;
}
.stock-card .card-metrics {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 28px;
  margin-bottom: 14px;
}
.stock-card .card-metric { font-size: 13px; color: var(--ink-faint); }
.stock-card .card-metric b {
  display: block;
  font-size: 16px;
  font-weight: 600;
  color: var(--ink);
  font-family: var(--sans);
}
.stock-card .card-metric b .up { color: var(--accent); }
.stock-card .card-link {
  font-size: 14px;
  color: var(--accent);
}

/* ============ 股票页 ============ */

.stock-header { margin-bottom: 40px; }
.stock-header .crumb {
  font-size: 13px;
  color: var(--ink-faint);
  margin-bottom: 16px;
}
.stock-header .crumb a { color: var(--ink-faint); }
.stock-header .crumb a:hover { color: var(--accent); }
.stock-header h1 {
  font-size: 32px;
  margin: 0 0 6px;
  letter-spacing: 0.03em;
}
.stock-header .stock-code-line {
  font-size: 14px;
  color: var(--accent);
  letter-spacing: 0.08em;
  margin: 0 0 14px;
}
.stock-header .oneliner {
  font-size: 16px;
  color: var(--ink-soft);
  margin: 0 0 24px;
}

/* 关键指标条 */
.metric-strip {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  border: 1px solid var(--line-dark);
  margin-bottom: 10px;
}
.metric-strip .m {
  padding: 14px 16px;
  border-right: 1px solid var(--line);
}
.metric-strip .m:last-child { border-right: none; }
.metric-strip .m-label {
  font-size: 12px;
  color: var(--ink-faint);
  margin-bottom: 4px;
}
.metric-strip .m-value {
  font-size: 18px;
  font-weight: 600;
  font-family: var(--sans);
  white-space: nowrap;
}
.metric-date {
  font-size: 12px;
  color: var(--ink-faint);
  margin: 0 0 32px;
}

/* 章节 */
.doc-section {
  margin-bottom: 64px;
  scroll-margin-top: 32px;
}
.doc-section h2 {
  font-size: 24px;
  margin: 0 0 20px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--ink);
}
.doc-section h2 .sec-no {
  color: var(--accent);
  margin-right: 10px;
}
.doc-section h3 {
  font-size: 18px;
  margin: 32px 0 12px;
}
.doc-section p { margin: 0 0 14px; }
.doc-section ul, .doc-section ol {
  padding-left: 24px;
  margin: 0 0 14px;
}
.doc-section li { margin-bottom: 8px; }
.doc-section li::marker { color: var(--accent); }

strong { color: var(--ink); }
.neg { color: var(--accent); font-weight: 600; }

.note {
  font-size: 13px;
  color: var(--ink-faint);
  border-left: 3px solid var(--line-dark);
  padding: 4px 0 4px 14px;
  margin: 16px 0;
}

/* 表格 */
.table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin: 0 0 18px;
  border: 1px solid var(--line);
}
table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  min-width: 480px;
}
th, td {
  text-align: left;
  padding: 10px 14px;
  border-bottom: 1px solid var(--line);
  white-space: nowrap;
}
th {
  font-family: var(--serif);
  font-weight: 700;
  background: var(--paper-deep);
  border-bottom: 1px solid var(--line-dark);
}
tbody tr:last-child td { border-bottom: none; }
tbody tr:hover { background: var(--accent-soft); }
td.num, th.num { text-align: right; }

/* CSS 条形图 */
.bars { margin: 8px 0 24px; }
.bars-caption {
  font-size: 13px;
  color: var(--ink-faint);
  margin: 0 0 10px;
}
.bar-row {
  display: grid;
  grid-template-columns: 52px 1fr auto;
  align-items: center;
  gap: 12px;
  margin-bottom: 8px;
}
.bar-year {
  font-size: 13px;
  color: var(--ink-faint);
  text-align: right;
}
.bar-track {
  background: var(--paper-deep);
  height: 20px;
  border: 1px solid var(--line);
  position: relative;
}
.bar-fill {
  height: 100%;
  background: var(--accent);
  opacity: 0.85;
}
.bar-fill.dim { background: var(--ink); opacity: 0.55; }
.bar-value {
  font-size: 13px;
  font-weight: 600;
  min-width: 72px;
}
.bar-value .yoy {
  font-weight: 400;
  color: var(--ink-faint);
  font-size: 12px;
  margin-left: 6px;
}
.bar-value .yoy.down { color: var(--accent); }

/* 时间线 */
.timeline {
  list-style: none;
  margin: 0 0 16px;
  padding: 0;
  border-left: 2px solid var(--line-dark);
}
.timeline li {
  position: relative;
  padding: 0 0 22px 24px;
}
.timeline li::before {
  content: "";
  position: absolute;
  left: -6px;
  top: 9px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--paper);
  border: 2px solid var(--accent);
}
.timeline .t-date {
  font-size: 13px;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.04em;
}
.timeline .t-body { font-size: 15px; color: var(--ink-soft); }

/* 参考来源 */
.sources ol { padding-left: 22px; font-size: 14px; }
.sources li { margin-bottom: 6px; }
.sources a { word-break: break-all; }

/* 页尾 */
.page-foot {
  margin-top: 72px;
  padding-top: 24px;
  border-top: 1px solid var(--line-dark);
  font-size: 13px;
  color: var(--ink-faint);
  line-height: 1.9;
}

/* 返回顶部 */
.back-top {
  position: fixed;
  right: 28px;
  bottom: 32px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1px solid var(--line-dark);
  background: var(--paper);
  color: var(--ink-soft);
  font-size: 18px;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s;
  z-index: 60;
  line-height: 1;
}
.back-top.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.back-top:hover { color: var(--accent); border-color: var(--accent); }

/* ============ 移动端 ============ */
@media (max-width: 899px) {
  .topbar { display: flex; }
  .sidebar {
    transform: translateX(-100%);
    transition: transform 0.25s ease;
    width: 260px;
    box-shadow: 2px 0 16px rgba(31, 31, 31, 0.12);
    padding-top: 28px;
  }
  .sidebar.open { transform: translateX(0); }
  .main { margin-left: 0; }
  .content { padding: 36px 20px 80px; }
  .hero h1 { font-size: 27px; }
  .stock-header h1 { font-size: 26px; }
  .metric-strip { grid-template-columns: repeat(2, 1fr); }
  .metric-strip .m { border-bottom: 1px solid var(--line); }
  .doc-section { scroll-margin-top: 76px; }
  .back-top { right: 18px; bottom: 22px; }
}

@media (min-width: 900px) {
  .sidebar { transform: none !important; }
}

/* 打印与减弱动效 */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}