/* ===== 基础变量（浅色 · 冷色调色板） ===== */
:root {
  --bg: #f5f8fc;
  --bg-alt: #eef3fa;
  --surface: #ffffff;
  --surface-2: #f6f9fe;
  --border: #e2e9f3;
  --border-strong: #cdd9ea;
  --text: #16233b;
  --text-dim: #55657f;
  --text-faint: #8a97ad;
  --cyan: #15a9c0;
  --blue: #2f6bff;
  --purple: #7a4dff;
  --grad: linear-gradient(120deg, #19c2d6 0%, #2f6bff 50%, #7a4dff 100%);
  --radius: 16px;
  --radius-sm: 10px;
  --maxw: 1120px;
  --shadow: 0 12px 32px rgba(28, 58, 110, 0.10);
  --shadow-sm: 0 4px 14px rgba(28, 58, 110, 0.06);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; scroll-padding-top: 76px; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
code {
  font-family: "JetBrains Mono", "Fira Code", Consolas, monospace;
  background: rgba(47, 107, 255, 0.09);
  color: #1f54d6;
  padding: 1px 6px;
  border-radius: 6px;
  font-size: 0.86em;
}

/* ===== 导航 ===== */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(14px);
  background: rgba(245, 248, 252, 0.82);
  border-bottom: 1px solid transparent;
  transition: border-color 0.25s, background 0.25s;
}
.nav.scrolled { border-bottom-color: var(--border); }
.nav-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  gap: 20px;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 1.05rem; }
.brand-name { background: var(--grad); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
.nav-links { display: flex; gap: 26px; margin-left: auto; }
.nav-links a { color: var(--text-dim); font-size: 0.94rem; transition: color 0.2s; }
.nav-links a:hover { color: var(--blue); }
.nav-cta { margin-left: 4px; }

/* ===== 按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 11px 22px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.94rem;
  cursor: pointer;
  transition: transform 0.18s, box-shadow 0.18s, background 0.2s, border-color 0.2s;
  border: 1px solid transparent;
}
.btn-primary { background: var(--grad); color: #fff; box-shadow: 0 10px 26px rgba(47, 107, 255, 0.32); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 14px 34px rgba(47, 107, 255, 0.42); }
.btn-ghost { background: rgba(47, 107, 255, 0.05); border-color: var(--border-strong); color: var(--text); }
.btn-ghost:hover { background: rgba(47, 107, 255, 0.1); border-color: var(--blue); color: var(--blue); }

/* ===== Hero ===== */
.hero { position: relative; overflow: hidden; }
.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(620px 420px at 16% 8%, rgba(25, 194, 214, 0.18), transparent 60%),
    radial-gradient(680px 480px at 84% 14%, rgba(122, 77, 255, 0.14), transparent 60%),
    radial-gradient(820px 540px at 50% 102%, rgba(47, 107, 255, 0.12), transparent 60%);
  pointer-events: none;
}
.hero-inner {
  position: relative;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 96px 24px 80px;
  text-align: center;
}
.badge {
  display: inline-block;
  padding: 6px 16px;
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  font-size: 0.82rem;
  color: var(--text-dim);
  background: rgba(47, 107, 255, 0.05);
  margin-bottom: 26px;
}
.hero-title {
  font-size: clamp(2.2rem, 5vw, 3.6rem);
  line-height: 1.15;
  font-weight: 800;
  letter-spacing: -0.02em;
}
.grad { background: var(--grad); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
.hero-sub {
  max-width: 680px;
  margin: 22px auto 0;
  color: var(--text-dim);
  font-size: 1.08rem;
}
.hero-actions { display: flex; gap: 14px; justify-content: center; margin-top: 34px; flex-wrap: wrap; }
.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
  max-width: 640px;
  margin: 64px auto 0;
}
.stat { padding: 18px 10px; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-sm); box-shadow: var(--shadow-sm); }
.stat-num { display: block; font-size: 1.8rem; font-weight: 800; background: var(--grad); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
.stat-label { font-size: 0.82rem; color: var(--text-faint); }

/* ===== 区块 ===== */
.section { max-width: var(--maxw); margin: 0 auto; padding: 84px 24px; }
.section-alt { max-width: none; background: var(--bg-alt); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.section-alt > * { max-width: var(--maxw); margin-left: auto; margin-right: auto; }
.section-head { text-align: center; margin-bottom: 52px; }
.section-title { font-size: clamp(1.7rem, 3.5vw, 2.4rem); font-weight: 800; letter-spacing: -0.01em; }
.section-desc { color: var(--text-dim); margin-top: 12px; font-size: 1.02rem; }

/* ===== 卡片网格 ===== */
.grid { display: grid; gap: 20px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.card {
  position: relative;
  overflow: hidden;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 24px;
  transition: transform 0.2s, border-color 0.2s, box-shadow 0.2s;
}
.card::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--grad);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.28s ease;
}
.card:hover { transform: translateY(-4px); border-color: rgba(47, 107, 255, 0.45); box-shadow: var(--shadow); }
.card:hover::before { transform: scaleX(1); }
.card h3 { font-size: 1.12rem; margin-bottom: 8px; color: var(--text); }
.card p { color: var(--text-dim); font-size: 0.94rem; }

/* ===== 工具集 chips ===== */
.tool-group { margin-bottom: 30px; }
.group-title { font-size: 1.05rem; margin-bottom: 14px; color: var(--text); padding-left: 12px; border-left: 3px solid var(--blue); }
.chips { display: flex; flex-wrap: wrap; gap: 10px; }
.chip {
  padding: 7px 15px;
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  background: var(--surface);
  font-size: 0.86rem;
  color: var(--text-dim);
  font-family: "JetBrains Mono", Consolas, monospace;
  transition: border-color 0.2s, color 0.2s, background 0.2s;
}
.chip:hover { border-color: var(--blue); color: var(--blue); background: rgba(47, 107, 255, 0.06); }

/* ===== 架构 ===== */
.arch { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-bottom: 48px; }
.arch-col { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; box-shadow: var(--shadow-sm); }
.arch-col h4 { font-size: 1.05rem; margin-bottom: 16px; color: var(--blue); }
.arch-list { list-style: none; display: flex; flex-direction: column; gap: 11px; }
.arch-list li { color: var(--text-dim); font-size: 0.92rem; padding-left: 16px; position: relative; }
.arch-list li::before { content: ""; position: absolute; left: 0; top: 10px; width: 6px; height: 6px; border-radius: 50%; background: var(--blue); }

.flow { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 30px 24px; box-shadow: var(--shadow-sm); }
.flow-title { font-size: 1.05rem; margin-bottom: 22px; color: var(--purple); text-align: center; }
.flow-track { display: flex; align-items: center; justify-content: center; gap: 10px; flex-wrap: wrap; }
.flow-node {
  background: var(--surface-2);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  padding: 14px 18px;
  text-align: center;
  font-weight: 600;
  min-width: 130px;
}
.flow-node small { display: block; font-weight: 400; color: var(--text-faint); font-size: 0.74rem; margin-top: 3px; }
.flow-arrow { color: var(--blue); font-size: 1.5rem; line-height: 1; }
.flow-note { text-align: center; color: var(--text-faint); font-size: 0.86rem; margin-top: 20px; }

/* ===== 步骤 ===== */
.steps { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 20px; }
.step { display: flex; gap: 16px; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 22px; box-shadow: var(--shadow-sm); }
.step-no {
  flex: 0 0 38px;
  width: 38px; height: 38px;
  border-radius: 50%;
  background: var(--grad);
  color: #fff;
  font-weight: 800;
  display: flex; align-items: center; justify-content: center;
}
.step-body h4 { font-size: 1.02rem; margin-bottom: 6px; color: var(--text); }
.step-body p { color: var(--text-dim); font-size: 0.9rem; }

/* ===== 元信息 / 日志 ===== */
.meta-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 14px; margin-bottom: 34px; }
.meta-item { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 16px 18px; box-shadow: var(--shadow-sm); }
.meta-item span { display: block; color: var(--text-faint); font-size: 0.8rem; margin-bottom: 6px; }
.meta-item strong { font-size: 0.96rem; font-weight: 700; color: var(--text); }
.log { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 8px 22px; box-shadow: var(--shadow-sm); }
.log summary { cursor: pointer; padding: 14px 0; font-weight: 600; color: var(--text); }
.log summary:hover { color: var(--blue); }
.log-list { list-style: none; padding: 6px 0 18px; display: flex; flex-direction: column; gap: 10px; }
.log-list li { color: var(--text-dim); font-size: 0.9rem; padding-left: 14px; border-left: 2px solid var(--border-strong); }
.log-list b { color: var(--blue); }

/* ===== 页脚 ===== */
.footer { border-top: 1px solid var(--border); background: var(--bg-alt); }
.footer-inner { max-width: var(--maxw); margin: 0 auto; padding: 46px 24px; text-align: center; }
.footer-brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 700; font-size: 1.1rem; }
.footer-note { color: var(--text-dim); margin: 12px 0 20px; }
.footer-links { display: flex; gap: 24px; justify-content: center; flex-wrap: wrap; }
.footer-links a { color: var(--text-dim); font-size: 0.92rem; transition: color 0.2s; }
.footer-links a:hover { color: var(--blue); }
.footer-copy { color: var(--text-faint); font-size: 0.82rem; margin-top: 22px; }

/* ===== 下载 ===== */
.download-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 24px;
  background: var(--surface);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  padding: 28px 32px;
  box-shadow: var(--shadow-sm);
}
.dl-main { display: flex; align-items: center; gap: 20px; }
.dl-badge {
  flex: 0 0 auto;
  width: 64px; height: 64px;
  border-radius: 16px;
  background: var(--grad);
  color: #fff;
  font-weight: 800;
  font-size: 1.08rem;
  letter-spacing: 0.5px;
  display: flex; align-items: center; justify-content: center;
}
.dl-info h3 { font-size: 1.22rem; color: var(--text); }
.dl-meta { color: var(--text-dim); font-size: 0.95rem; margin-top: 5px; }
.dl-actions { display: flex; gap: 12px; flex-wrap: wrap; }
.dl-note { text-align: center; color: var(--text-faint); font-size: 0.86rem; margin-top: 22px; }
@media (max-width: 560px) {
  .download-card { flex-direction: column; align-items: stretch; text-align: center; }
  .dl-main { justify-content: center; }
  .dl-actions { justify-content: center; }
  .dl-actions .btn { flex: 1 1 auto; }
}

/* ===== 404 ===== */
.nf { min-height: 70vh; display: flex; flex-direction: column; align-items: center; justify-content: center; text-align: center; gap: 18px; }
.nf h1 { font-size: 4rem; background: var(--grad); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }

/* ===== 响应式 ===== */
@media (max-width: 880px) {
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .arch { grid-template-columns: 1fr; }
  .nav-links { display: none; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 560px) {
  .grid-3 { grid-template-columns: 1fr; }
  .hero-inner { padding: 70px 20px 60px; }
  .section { padding: 64px 20px; }
  .flow-track { flex-direction: column; }
  .flow-arrow { transform: rotate(90deg); }
}