/* 设计令牌：对齐 iOS 端 Theme.swift 的纸质编辑风品牌 */
:root {
  /* 色彩 —— 取自 SwiftUI Theme */
  --paper: #f7f5f0;        /* 纸质米白底色 */
  --paper-2: #fbfaf7;      /* 更亮的卡片底 */
  --ink: #1c1c1a;          /* 浓墨主体文字 */
  --ink-soft: rgba(28, 28, 26, 0.55);  /* 弱化次级文字 */
  --hairline: rgba(28, 28, 26, 0.12);  /* 极细分界线 */
  --accent: #b84d33;       /* 陶土砖红强调色 */
  --accent-soft: rgba(184, 77, 51, 0.10);

  /* 排版 */
  --serif: Georgia, "Times New Roman", "Songti SC", "STSong", serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --mono: "SF Mono", ui-monospace, "JetBrains Mono", Menlo, Consolas, monospace;

  /* 间距与圆角 */
  --radius: 14px;
  --maxw: 1080px;
}

* {
  box-sizing: border-box;
}

html,
body {
  padding: 0;
  margin: 0;
}

body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

h1,
h2,
h3 {
  font-family: var(--serif);
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.01em;
}

.shell {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}

/* 通用区块 */
.section {
  padding: 72px 0;
}
.section-tight {
  padding: 40px 0;
}

.eyebrow {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 12px;
}

.lead {
  color: var(--ink-soft);
  font-size: 18px;
}

hr.hair {
  border: none;
  border-top: 1px solid var(--hairline);
  margin: 0;
}

/* 卡片 */
.card {
  background: var(--paper-2);
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  padding: 24px;
}

.grid {
  display: grid;
  gap: 16px;
}
.grid-2 {
  grid-template-columns: repeat(2, 1fr);
}
.grid-3 {
  grid-template-columns: repeat(3, 1fr);
}

.mono {
  font-family: var(--mono);
}

.btn {
  display: inline-block;
  font-family: var(--sans);
  font-weight: 600;
  font-size: 15px;
  padding: 12px 22px;
  border-radius: 999px;
  border: 1px solid var(--ink);
  background: var(--ink);
  color: var(--paper);
  transition: opacity 0.15s ease;
}
.btn:hover {
  opacity: 0.85;
  text-decoration: none;
}
.btn-ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--hairline);
}
.btn-ghost:hover {
  border-color: var(--ink);
}

@media (max-width: 760px) {
  .grid-2,
  .grid-3 {
    grid-template-columns: 1fr;
  }
  .section {
    padding: 48px 0;
  }
}

/* ===== 品牌标识（Header / Footer 共用） ===== */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--ink);
  font-family: var(--serif);
  font-weight: 600;
  font-size: 19px;
}
.brand:hover {
  text-decoration: none;
}
.brand-mark {
  color: var(--accent);
  font-size: 20px;
}
.brand-name {
  color: var(--ink);
}

/* ===== Header ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(247, 245, 240, 0.85);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--hairline);
}
.site-header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.nav {
  display: flex;
  gap: 24px;
  font-size: 15px;
}
.nav a {
  color: var(--ink);
}
.nav a:hover {
  color: var(--accent);
  text-decoration: none;
}
/* 移动端菜单按钮，默认在宽屏隐藏 */
.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--hairline);
  border-radius: 8px;
  font-size: 18px;
  padding: 6px 10px;
  cursor: pointer;
  color: var(--ink);
}
@media (max-width: 600px) {
  .nav {
    display: none;            /* 窄屏折叠 */
    position: absolute;
    top: 64px;
    right: 24px;
    flex-direction: column;
    gap: 14px;
    background: var(--paper-2);
    border: 1px solid var(--hairline);
    border-radius: var(--radius);
    padding: 16px 20px;
  }
  .nav.open {
    display: flex;            /* 点击展开 */
  }
  .nav-toggle {
    display: inline-block;
  }
}

/* ===== Footer ===== */
.site-footer {
  padding: 48px 0 64px;
}
.footer-grid {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 32px;
  padding: 32px 0 16px;
}
.muted {
  color: var(--ink-soft);
  margin-top: 12px;
  font-size: 15px;
}
.footer-links {
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-size: 15px;
}
.footer-links a {
  color: var(--ink);
}
.footer-links a:hover {
  color: var(--accent);
}
.copyright {
  color: var(--ink-soft);
  font-size: 13px;
  margin-top: 24px;
}

/* ===== Hero ===== */
.hero {
  padding: 88px 0 64px;
  text-align: center;
}
.hero-title {
  font-size: clamp(34px, 6vw, 56px);
  margin: 0 auto 20px;
  max-width: 760px;
}
.hero-lead {
  max-width: 620px;
  margin: 0 auto 32px;
}
.hero-cta {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
}
.hero-note {
  margin-top: 22px;
  font-size: 13px;
  color: var(--ink-soft);
}

/* ===== 通用区块标题 ===== */
.section-title {
  font-size: clamp(26px, 4vw, 36px);
  margin: 0 0 8px;
}

/* ===== 功能卡片 ===== */
.features {
  margin-top: 36px;
}
.feature {
  padding: 22px;
}
.feature-icon {
  font-size: 26px;
  margin-bottom: 10px;
}
.feature-title {
  font-size: 19px;
  margin: 0 0 8px;
}
.feature-desc {
  color: var(--ink-soft);
  font-size: 15px;
  margin: 0;
}

/* ===== 市场标签 ===== */
.markets {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.market-chip {
  border: 1px solid var(--hairline);
  border-radius: 999px;
  padding: 6px 14px;
  font-size: 14px;
  background: var(--paper-2);
}

/* ===== CTA ===== */
.cta {
  text-align: center;
}
.cta-inner .lead {
  margin-bottom: 28px;
}

/* ===== 隐私协议 ===== */
.privacy {
  padding: 64px 0 24px;
}
.privacy-title {
  font-size: clamp(30px, 5vw, 44px);
  margin: 0 0 8px;
}
.privacy-meta {
  color: var(--ink-soft);
  font-size: 14px;
  font-family: var(--mono);
}
.privacy h2 {
  font-size: 22px;
  margin: 36px 0 10px;
}
.privacy p,
.privacy li {
  color: var(--ink);
  font-size: 16px;
}
.privacy ul {
  padding-left: 22px;
}
.privacy li {
  margin-bottom: 8px;
}
.p-section h2 {
  display: flex;
  align-items: baseline;
  gap: 10px;
}
.p-num {
  color: var(--accent);
  font-size: 16px;
}