/* ============================================================
 * 蜗牛 AI · 指南 / 博客落地页共享样式
 * 设计令牌对齐官网 index.html：ink + accent橙 + gold + paper
 * ============================================================ */
:root {
  --ink: #1A1A2E;
  --ink-2: #2A2A40;
  --ink-3: #6A6A85;
  --paper: #FCFCFA;
  --paper-2: #F5F4EE;
  --paper-3: #E8E7E0;
  --accent: #FF5B1F;
  --accent-2: #E84A0F;
  --accent-light: rgba(255, 91, 31, 0.08);
  --accent-warm: #FFF5EE;
  --gold: #D4A547;
  --line: rgba(26, 26, 46, 0.08);
  --shadow-sm: 0 1px 3px rgba(26, 26, 46, 0.04), 0 2px 8px rgba(26, 26, 46, 0.04);
  --shadow-md: 0 4px 16px rgba(26, 26, 46, 0.08);
  --shadow-lg: 0 12px 36px rgba(26, 26, 46, 0.12);
  --r-sm: 6px; --r-md: 10px; --r-lg: 16px; --r-xl: 24px;
  --sans: 'Inter', 'Helvetica Neue', 'Helvetica', 'Arial', 'PingFang SC', 'Microsoft YaHei UI', 'Noto Sans SC', sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--sans);
  background: var(--paper);
  color: var(--ink);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-2); }
img { max-width: 100%; display: block; }

/* ===== 导航 ===== */
.g-nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  display: flex; justify-content: space-between; align-items: center;
  padding: 14px 40px;
  background: linear-gradient(180deg, rgba(252, 252, 250, .96) 0%, rgba(252, 252, 250, .85) 100%);
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}
.g-nav .logo { display: flex; align-items: center; gap: 10px; color: var(--ink); text-decoration: none; }
.g-nav .logo img { height: 30px; width: auto; }
.g-nav .logo span { font-weight: 800; font-size: 15px; letter-spacing: -0.01em; }
.g-nav .links { display: flex; gap: 26px; align-items: center; }
.g-nav .links a { font-size: 13px; font-weight: 600; color: var(--ink-3); transition: color .2s; }
.g-nav .links a:hover { color: var(--accent); }
.g-btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 9px 18px; border-radius: 100px; background: var(--accent); color: #fff;
  font-size: 13px; font-weight: 700; transition: background .2s;
}
.g-btn:hover { background: var(--accent-2); color: #fff; }

/* ===== 页头 ===== */
.g-header { padding: 128px 24px 40px; text-align: center; background:
  radial-gradient(circle at 50% -10%, rgba(255, 91, 31, 0.07) 0%, transparent 55%); }
.g-breadcrumb {
  display: flex; gap: 8px; justify-content: center; align-items: center;
  font-size: 13px; color: var(--ink-3); margin-bottom: 18px; flex-wrap: wrap;
}
.g-breadcrumb a { color: var(--ink-3); }
.g-breadcrumb a:hover { color: var(--accent); }
.g-breadcrumb .sep { color: var(--paper-3); }
.g-header h1 {
  font-size: clamp(28px, 4.5vw, 44px); line-height: 1.2; font-weight: 800;
  letter-spacing: -0.02em; max-width: 880px; margin: 0 auto 16px;
}
.g-header .lead {
  max-width: 720px; margin: 0 auto; font-size: clamp(15px, 2vw, 18px);
  color: var(--ink-2);
}
.g-header .meta {
  margin-top: 22px; display: flex; gap: 18px; justify-content: center;
  font-size: 13px; color: var(--ink-3); flex-wrap: wrap;
}
.g-header .meta span { display: inline-flex; align-items: center; gap: 6px; }

/* ===== 正文容器 ===== */
.g-wrap { max-width: 820px; margin: 0 auto; padding: 24px 24px 64px; }
.g-wrap.wide { max-width: 1080px; }

/* ===== 文章排版 ===== */
.g-wrap h2 {
  font-size: 26px; font-weight: 800; margin: 44px 0 16px;
  padding-left: 14px; border-left: 5px solid var(--accent); letter-spacing: -0.01em;
}
.g-wrap h3 { font-size: 19px; font-weight: 700; margin: 28px 0 12px; color: var(--ink-2); }
.g-wrap p { margin: 14px 0; color: var(--ink-2); }
.g-wrap ul, .g-wrap ol { margin: 14px 0; padding-left: 22px; color: var(--ink-2); }
.g-wrap li { margin: 8px 0; }
.g-wrap strong { color: var(--ink); font-weight: 700; }
.g-wrap code {
  background: var(--paper-2); border: 1px solid var(--line); border-radius: 5px;
  padding: 1px 6px; font-family: 'JetBrains Mono', 'SF Mono', Menlo, Consolas, monospace;
  font-size: 0.88em; color: var(--accent-2);
}
.g-wrap table {
  width: 100%; border-collapse: collapse; margin: 20px 0; font-size: 14px;
  border: 1px solid var(--line); border-radius: var(--r-md); overflow: hidden;
  box-shadow: var(--shadow-sm);
}
.g-wrap th, .g-wrap td { padding: 12px 14px; text-align: left; border-bottom: 1px solid var(--line); }
.g-wrap th { background: var(--accent-light); color: var(--accent-2); font-weight: 700; }
.g-wrap tr:last-child td { border-bottom: none; }

/* 提示框 */
.g-callout {
  border-radius: var(--r-lg); padding: 18px 22px; margin: 22px 0;
  border: 1px solid var(--line); background: var(--paper-2);
}
.g-callout.tip { background: var(--accent-warm); border-color: rgba(255, 91, 31, 0.25); }
.g-callout.tip .ttl { color: var(--accent-2); font-weight: 800; display: flex; gap: 8px; align-items: center; margin-bottom: 6px; }
.g-callout p:last-child { margin-bottom: 0; }

/* ===== 直接答案框 ===== */
.g-answer {
  background: linear-gradient(135deg, #fff 0%, var(--accent-warm) 100%);
  border: 2px solid var(--accent); border-radius: var(--r-lg);
  padding: 22px 26px; margin: 8px 0 28px; box-shadow: var(--shadow-sm);
}
.g-answer .lbl { font-size: 12px; font-weight: 800; letter-spacing: 0.08em; color: var(--accent-2); text-transform: uppercase; margin-bottom: 8px; }
.g-answer p { margin: 0; font-size: 17px; color: var(--ink); font-weight: 500; }

/* ===== 集群卡网格 ===== */
.g-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin: 24px 0; }
.g-grid.cols-2 { grid-template-columns: repeat(2, 1fr); }
.g-card {
  display: block; background: #fff; border: 1px solid var(--line); border-radius: var(--r-lg);
  padding: 22px; box-shadow: var(--shadow-sm); transition: transform .15s, box-shadow .15s, border-color .15s;
  color: inherit;
}
.g-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: rgba(255, 91, 31, 0.4); }
.g-card .emo { font-size: 32px; }
.g-card h3 { margin: 12px 0 6px; font-size: 17px; }
.g-card p { font-size: 14px; color: var(--ink-3); margin: 0; }
.g-card .go { margin-top: 12px; font-size: 13px; font-weight: 700; color: var(--accent); }

/* ===== 相关文章 ===== */
.g-related { margin-top: 56px; padding-top: 32px; border-top: 1px solid var(--line); }
.g-related h2 { border: none; padding: 0; margin: 0 0 18px; font-size: 22px; }
.g-related .g-grid { margin: 0; }

/* ===== FAQ ===== */
.g-faq { margin: 18px 0; }
.g-faq details {
  border: 1px solid var(--line); border-radius: var(--r-md); padding: 4px 18px; margin-bottom: 10px;
  background: #fff; transition: border-color .15s;
}
.g-faq details[open] { border-color: var(--accent); }
.g-faq summary {
  cursor: pointer; font-size: 16px; font-weight: 700; color: var(--ink); padding: 12px 0;
  list-style: none; display: flex; justify-content: space-between; align-items: center; gap: 12px;
}
.g-faq summary::-webkit-details-marker { display: none; }
.g-faq summary::after { content: "+"; color: var(--accent); font-size: 22px; font-weight: 700; flex: none; }
.g-faq details[open] summary::after { content: "−"; }
.g-faq .ans { padding: 0 0 14px; color: var(--ink-2); font-size: 15px; }

/* ===== CTA 横条 ===== */
.g-cta {
  margin: 40px 0 8px; padding: 28px; border-radius: var(--r-xl);
  background: linear-gradient(135deg, var(--ink) 0%, var(--ink-2) 100%); color: #fff; text-align: center;
}
.g-cta h3 { color: #fff; font-size: 22px; margin: 0 0 8px; }
.g-cta p { color: rgba(255, 255, 255, 0.8); margin: 0 0 18px; }
.g-cta .g-btn { background: var(--accent); }
.g-cta .g-btn:hover { background: var(--accent-2); }

/* ===== 页脚 ===== */
.g-foot { text-align: center; color: var(--ink-3); font-size: 13px; padding: 28px 24px; border-top: 1px solid var(--line); }
.g-foot a { color: var(--ink-3); }

/* ===== 响应式 ===== */
@media (max-width: 860px) {
  .g-grid, .g-grid.cols-2 { grid-template-columns: 1fr; }
}
@media (max-width: 720px) {
  .g-nav { padding: 12px 16px; }
  .g-nav .links { display: none; }
  .g-header { padding: 110px 18px 32px; }
  .g-wrap { padding: 18px 18px 56px; }
}