/* 第1套：编辑部专栏 — 左侧固定目录 + 右侧长文 */
:root {
  --cream: #F6F1E8;
  --ink: #1A2A24;
  --deep: #075E54;
  --bright: #25D366;
  --paper: #FFFBF4;
  --line: #D9CFC0;
  --muted: #5A6B64;
  --nav-w: 220px;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: auto;
}

body {
  margin: 0;
  background: var(--cream);
  color: var(--ink);
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.8;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: var(--deep);
  color: #fff;
  padding: 14px 28px 14px calc(var(--nav-w) + 40px);
  border-bottom: 3px solid var(--bright);
}

.brand-row {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-mark {
  width: 28px;
  height: 28px;
  flex: 0 0 28px;
}

.brand-mark svg {
  width: 28px;
  height: 28px;
  display: block;
}

.brand-name {
  font-family: "Georgia", "Songti SC", "SimSun", serif;
  font-size: 18px;
  letter-spacing: 0.04em;
}

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

.side-nav {
  position: fixed;
  top: 0;
  left: 0;
  width: var(--nav-w);
  height: 100vh;
  background: #EFE6D4;
  border-right: 1px solid var(--line);
  padding: 88px 18px 32px;
  overflow-y: auto;
}

.side-nav .nav-label {
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--muted);
  margin: 0 0 12px;
  text-transform: uppercase;
}

.side-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.side-nav li { margin: 0 0 4px; }

.side-nav a {
  display: block;
  padding: 8px 10px;
  color: var(--deep);
  text-decoration: none;
  border-left: 3px solid transparent;
  font-size: 14px;
}

.side-nav a:hover,
.side-nav a:focus {
  background: #e3d7c0;
  border-left-color: var(--bright);
}

.page {
  margin-left: var(--nav-w);
  width: calc(100% - var(--nav-w));
  padding: 36px 56px 80px;
  max-width: 980px;
}

.hero {
  padding: 12px 0 36px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 36px;
}

.hero h1 {
  font-family: "Georgia", "Songti SC", "SimSun", serif;
  font-size: 40px;
  line-height: 1.35;
  color: var(--deep);
  margin: 0 0 18px;
  font-weight: 600;
}

.lead {
  font-size: 18px;
  color: var(--muted);
  margin: 0 0 16px;
}

.hero-actions {
  display: flex;
  gap: 12px;
  margin-top: 22px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--deep);
  color: #fff;
  text-decoration: none;
  padding: 12px 20px;
  border-radius: 4px;
  font-size: 15px;
}

.btn svg {
  width: 18px;
  height: 18px;
}

.btn:hover {
  background: #0a7a6c;
}

.btn-ghost {
  background: transparent;
  color: var(--deep);
  border: 1px solid var(--deep);
}

.btn-ghost:hover {
  background: #e4f6ea;
}

.block {
  margin: 0 0 48px;
  padding: 0 0 8px;
}

.block h2 {
  font-family: "Georgia", "Songti SC", "SimSun", serif;
  font-size: 28px;
  color: var(--deep);
  margin: 0 0 16px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--bright);
}

.block h3 {
  font-family: "Georgia", "Songti SC", "SimSun", serif;
  font-size: 20px;
  margin: 22px 0 10px;
  color: #0b4a43;
}

.block p {
  margin: 0 0 14px;
}

.icon-row {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin: 18px 0;
}

.icon-row .glyph {
  width: 36px;
  height: 36px;
  flex: 0 0 36px;
  background: #e4f6ea;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.icon-row .glyph svg {
  width: 22px;
  height: 22px;
}

.note {
  background: var(--paper);
  border: 1px solid var(--line);
  padding: 16px 18px;
  margin: 16px 0;
}

.compare {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0 20px;
  font-size: 15px;
}

.compare th,
.compare td {
  border: 1px solid var(--line);
  padding: 10px 12px;
  text-align: left;
  vertical-align: top;
}

.compare th {
  background: #e7f4ec;
  color: var(--deep);
}

.faq article {
  background: var(--paper);
  border: 1px solid var(--line);
  padding: 16px 18px;
  margin: 0 0 12px;
}

.faq h3 {
  margin-top: 0;
  border: 0;
}

.site-footer {
  margin-left: var(--nav-w);
  background: var(--deep);
  color: #e8f3ef;
  padding: 32px 56px 40px;
}

.site-footer p {
  margin: 0 0 12px;
  max-width: 720px;
  font-size: 14px;
  line-height: 1.7;
}

.site-footer a {
  color: var(--bright);
}

@media (max-width: 860px) {
  .side-nav { display: none; }
  .site-header,
  .page,
  .site-footer { margin-left: 0; padding-left: 20px; padding-right: 20px; }
  .page { width: 100%; max-width: none; }
  .hero h1 { font-size: 30px; }
}

.wa-brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  flex: 0 0 auto;
  text-decoration: none;
  color: inherit;
  font-weight: 700;
  letter-spacing: 0.02em;
}
.wa-logo {
  width: 28px;
  height: 28px;
  display: block;
  flex: 0 0 28px;
  color: #25D366;
}
.wa-name {
  font-size: 16px;
  line-height: 1;
  white-space: nowrap;
}

.side-nav .wa-brand { margin: 0 0 18px; color: #075E54; }
.side-nav .wa-logo { color: #075E54; }
.side-nav .wa-name { font-size: 18px; }
.site-header .wa-logo { color: #25D366; }