/* 手稿编辑台 · Landing Page
   宋体 × 印章朱砂 × 象牙纸本 — 延续 popup 设计语言 */
:root {
  --paper: #f4f1ea;
  --paper-soft: #ece8dc;
  --paper-deep: #e2ddce;
  --ink: #1a1a1a;
  --ink-2: #2e2c27;
  --ink-soft: #55524b;
  --ink-faded: #8f8b80;
  --ink-ghost: #b8b4a8;
  --rule: #1a1a1a;
  --seal: #b4281e;
  --seal-ink: #8c1e15;
  --seal-soft: #f1e3df;
  --moss: #4a5d3f;
  --moss-soft: #e6ede0;
  --amber: #8a5a14;
  --amber-soft: #f2e8d2;
  --serif: 'Songti SC', 'STSong', 'Source Han Serif CN', 'Noto Serif CJK SC', 'SimSun', Georgia, 'Times New Roman', serif;
  --sans: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', system-ui, -apple-system, sans-serif;
  --serif-en: 'Iowan Old Style', 'Palatino Linotype', 'Book Antiqua', Georgia, 'Times New Roman', serif;
  --sans-en: 'Avenir Next', 'Segoe UI', 'Helvetica Neue', Helvetica, Arial, sans-serif;
  --mono: 'SF Mono', Menlo, Monaco, 'Cascadia Mono', Consolas, 'Courier New', monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  padding: 0;
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.65;
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  font-feature-settings: 'palt' 1;
}
body.lang-en {
  font-family: var(--sans-en);
  letter-spacing: 0.01em;
}

a { color: var(--seal); text-decoration: none; }
a:hover { color: var(--seal-ink); text-decoration: underline; }

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 32px;
}

/* ===== 顶部导航 ===== */
.nav {
  border-bottom: 1px solid var(--ink);
  background: var(--paper);
  position: sticky;
  top: 0;
  z-index: 50;
}
.nav-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 14px 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}
.nav-brand {
  font-family: var(--serif);
  font-size: 20px;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--ink);
  display: flex;
  align-items: center;
  gap: 10px;
}
.lang-en .nav-brand,
.lang-en .hero-title,
.lang-en .section-title,
.lang-en .diff-card h3,
.lang-en .feat-body h3,
.lang-en .price-name,
.lang-en .faq-item summary,
.lang-en .final-cta h2,
.lang-en .footer-brand,
.lang-en .compare-table th {
  font-family: var(--serif-en);
}
.nav-brand::after {
  content: '记';
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  background: var(--seal);
  color: var(--paper);
  font-family: var(--serif);
  font-size: 13px;
  border-radius: 2px;
}
.nav-links {
  display: flex;
  gap: 28px;
  font-size: 14px;
}
.nav-actions {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-left: auto;
}
.lang-switch {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 10px;
  border: 1px solid var(--ink-ghost);
  border-radius: 999px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-faded);
  background: rgba(255, 255, 255, 0.35);
}
.lang-switch a {
  color: var(--ink-faded);
  text-decoration: none;
}
.lang-switch a.active {
  color: var(--ink);
}
.lang-switch a:hover {
  color: var(--seal);
}
.nav-links a {
  color: var(--ink);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.nav-links a:hover { color: var(--seal); text-decoration: none; }
.nav-cta {
  background: var(--ink);
  color: var(--paper);
  padding: 8px 16px;
  border-radius: 2px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.nav-cta:hover {
  background: var(--seal);
  color: var(--paper);
  text-decoration: none;
}

/* ===== Hero ===== */
.hero {
  padding: 96px 0 80px;
  border-bottom: 1px solid var(--ink);
  position: relative;
}
.hero-eyebrow {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--seal);
  margin-bottom: 20px;
}
.hero-title {
  font-family: var(--serif);
  font-size: 64px;
  font-weight: 500;
  line-height: 1.1;
  letter-spacing: 0.02em;
  margin: 0 0 24px;
  color: var(--ink);
}
.lang-en .hero-title {
  font-size: 58px;
  max-width: 900px;
  line-height: 1.04;
}
.hero-title .accent {
  color: var(--seal);
  font-style: normal;
}
.lang-en .hero-lede,
.lang-en .section-lede {
  max-width: 760px;
}
.hero-lede {
  font-size: 19px;
  line-height: 1.7;
  color: var(--ink-soft);
  max-width: 680px;
  margin: 0 0 36px;
}
.hero-cta-row {
  display: flex;
  gap: 16px;
  align-items: center;
  flex-wrap: wrap;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 26px;
  border-radius: 2px;
  font-family: var(--sans);
  font-size: 15px;
  font-weight: 500;
  letter-spacing: 0.02em;
  border: 1px solid var(--ink);
  cursor: pointer;
  transition: transform 0.15s;
}
.btn:hover { transform: translate(-1px, -1px); text-decoration: none; }
.btn-primary {
  background: var(--ink);
  color: var(--paper);
  box-shadow: 3px 3px 0 0 var(--seal);
}
.btn-primary:hover { color: var(--paper); box-shadow: 4px 4px 0 0 var(--seal); }
.btn-ghost {
  background: var(--paper);
  color: var(--ink);
  box-shadow: 3px 3px 0 0 var(--ink);
}
.btn-ghost:hover { color: var(--ink); box-shadow: 4px 4px 0 0 var(--ink); }
.hero-proof {
  margin-top: 28px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--ink-faded);
}
.hero-proof .dot { color: var(--seal); }

/* ===== 差异化带 ===== */
.differentiator {
  padding: 72px 0;
  background: var(--paper-soft);
  border-bottom: 1px solid var(--ink);
}
.section-eyebrow {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--seal);
  margin-bottom: 14px;
}
.section-title {
  font-family: var(--serif);
  font-size: 40px;
  font-weight: 500;
  line-height: 1.2;
  letter-spacing: 0.02em;
  margin: 0 0 18px;
  color: var(--ink);
}
.section-lede {
  font-size: 17px;
  color: var(--ink-soft);
  max-width: 680px;
  margin: 0 0 48px;
}
.diff-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.diff-card {
  background: var(--paper);
  border: 1px solid var(--ink);
  border-radius: 2px;
  padding: 28px 24px;
  box-shadow: 3px 3px 0 0 var(--ink);
  position: relative;
}
.diff-card .num {
  font-family: var(--serif);
  font-size: 13px;
  color: var(--seal);
  letter-spacing: 0.2em;
  margin-bottom: 16px;
}
.diff-card h3 {
  font-family: var(--serif);
  font-size: 22px;
  font-weight: 500;
  margin: 0 0 10px;
  color: var(--ink);
}
.diff-card p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-soft);
  margin: 0;
}

/* ===== 竞品对比表 ===== */
.compare {
  padding: 88px 0;
  border-bottom: 1px solid var(--ink);
}
.compare-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  background: var(--paper);
  border: 1px solid var(--ink);
}
.compare-table th,
.compare-table td {
  padding: 16px 18px;
  text-align: left;
  border-bottom: 1px solid var(--ink-ghost);
}
.compare-table th {
  font-family: var(--serif);
  font-weight: 500;
  font-size: 15px;
  background: var(--paper-soft);
  border-bottom: 1px solid var(--ink);
}
.compare-table th.us {
  background: var(--seal);
  color: var(--paper);
}
.compare-table td.us {
  background: var(--seal-soft);
  font-weight: 500;
}
.compare-table tr:last-child td { border-bottom: none; }
.compare-table .check { color: var(--moss); font-weight: 700; }
.compare-table .cross { color: var(--ink-faded); }

/* ===== 功能展示 ===== */
.features {
  padding: 88px 0;
  background: var(--paper-soft);
  border-bottom: 1px solid var(--ink);
}
.feat-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}
.feat-card {
  background: var(--paper);
  border: 1px solid var(--ink);
  border-radius: 2px;
  padding: 32px 28px;
  box-shadow: 3px 3px 0 0 var(--ink);
  display: flex;
  gap: 18px;
}
.feat-icon {
  width: 44px;
  height: 44px;
  flex-shrink: 0;
  background: var(--ink);
  color: var(--paper);
  border-radius: 2px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--serif);
  font-size: 22px;
}
.feat-card.highlight .feat-icon { background: var(--seal); }
.feat-body h3 {
  font-family: var(--serif);
  font-size: 20px;
  font-weight: 500;
  margin: 0 0 8px;
  color: var(--ink);
}
.feat-body p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-soft);
  margin: 0;
}

/* ===== 价格 ===== */
.pricing {
  padding: 88px 0;
  border-bottom: 1px solid var(--ink);
}
.price-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
  margin-top: 16px;
}
.price-card {
  background: var(--paper);
  border: 1px solid var(--ink);
  border-radius: 2px;
  padding: 40px 32px;
  box-shadow: 4px 4px 0 0 var(--ink);
  position: relative;
}
.price-card.pro {
  background: var(--ink);
  color: var(--paper);
  box-shadow: 4px 4px 0 0 var(--seal);
}
.price-card.pro .price-name,
.price-card.pro .price-amount,
.price-card.pro .price-tagline,
.price-card.pro li { color: var(--paper); }
.price-card.pro li::before { background: var(--seal); }
.price-badge {
  position: absolute;
  top: -14px;
  right: 24px;
  background: var(--seal);
  color: var(--paper);
  font-family: var(--mono);
  font-size: 11px;
  padding: 6px 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  border-radius: 2px;
}
.price-name {
  font-family: var(--serif);
  font-size: 22px;
  font-weight: 500;
  margin: 0 0 6px;
  color: var(--ink);
}
.price-tagline {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-faded);
  margin: 0 0 24px;
}
.price-amount {
  font-family: var(--serif);
  font-size: 52px;
  font-weight: 500;
  line-height: 1;
  margin: 0 0 4px;
  color: var(--ink);
}
.price-amount .unit {
  font-size: 16px;
  color: var(--ink-soft);
  font-family: var(--sans);
  margin-left: 4px;
}
.price-amount .strike {
  font-size: 20px;
  color: var(--ink-faded);
  text-decoration: line-through;
  margin-right: 10px;
  font-weight: 400;
}
.price-note {
  font-size: 13px;
  color: var(--ink-faded);
  margin: 0 0 28px;
  font-family: var(--mono);
  letter-spacing: 0.06em;
}
.price-card ul {
  list-style: none;
  padding: 0;
  margin: 0 0 28px;
}
.price-card li {
  position: relative;
  padding: 8px 0 8px 24px;
  font-size: 14px;
  color: var(--ink-soft);
  border-bottom: 1px dashed var(--ink-ghost);
}
.price-card li:last-child { border-bottom: none; }
.price-card li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 15px;
  width: 12px;
  height: 2px;
  background: var(--seal);
}
.price-cta {
  width: 100%;
  justify-content: center;
  padding: 14px 20px;
}

/* ===== FAQ ===== */
.faq {
  padding: 88px 0;
  background: var(--paper-soft);
  border-bottom: 1px solid var(--ink);
}
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  max-width: 860px;
  margin-top: 16px;
}
.faq-item {
  background: var(--paper);
  border: 1px solid var(--ink);
  border-radius: 2px;
}
.faq-item summary {
  padding: 18px 22px;
  font-family: var(--serif);
  font-size: 17px;
  font-weight: 500;
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: '+';
  font-family: var(--serif);
  font-size: 22px;
  color: var(--seal);
  transition: transform 0.2s;
}
.faq-item[open] summary::after { content: '−'; }
.faq-item .answer {
  padding: 0 22px 22px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-soft);
}
.faq-item .answer p { margin: 0 0 10px; }
.faq-item .answer p:last-child { margin: 0; }

/* ===== 终章 CTA ===== */
.final-cta {
  padding: 100px 0;
  text-align: center;
  border-bottom: 1px solid var(--ink);
}
.final-cta h2 {
  font-family: var(--serif);
  font-size: 44px;
  font-weight: 500;
  margin: 0 0 16px;
  color: var(--ink);
}
.final-cta p {
  font-size: 17px;
  color: var(--ink-soft);
  margin: 0 0 32px;
}

/* ===== 页脚 ===== */
footer {
  padding: 48px 0 32px;
  background: var(--paper);
}
.footer-inner {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 36px;
  margin-bottom: 32px;
}
.footer-brand {
  font-family: var(--serif);
  font-size: 18px;
  margin-bottom: 8px;
}
.footer-about {
  font-size: 13px;
  color: var(--ink-soft);
  line-height: 1.7;
}
.footer-col h4 {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink);
  margin: 0 0 14px;
}
.footer-col a {
  display: block;
  font-size: 13px;
  color: var(--ink-soft);
  padding: 4px 0;
}
.footer-col a:hover { color: var(--seal); text-decoration: none; }
.footer-legal {
  border-top: 1px solid var(--ink-ghost);
  padding-top: 20px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--ink-faded);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

/* ===== 响应式 ===== */
@media (max-width: 860px) {
  .hero { padding: 56px 0 48px; }
  .hero-title { font-size: 38px; }
  .lang-en .hero-title { font-size: 34px; }
  .hero-lede { font-size: 16px; }
  .section-title { font-size: 28px; }
  .diff-grid,
  .feat-grid,
  .price-grid { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr 1fr; }
  .nav-links { display: none; }
  .nav-inner {
    flex-wrap: wrap;
    justify-content: space-between;
  }
  .nav-actions {
    width: 100%;
    justify-content: space-between;
  }
  .compare-table { font-size: 12px; }
  .compare-table th,
  .compare-table td { padding: 10px 8px; }
  .final-cta h2 { font-size: 30px; }
  .price-amount { font-size: 40px; }
}