:root {
  --bg: #f6f8fb;
  --surface: #ffffff;
  --surface-2: #f8fafc;
  --border: #e6ebf2;
  --text: #1f2a37;
  --text-2: #52606d;
  --text-3: #8a97a6;
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --accent: #0ea5e9;
  --green: #10b981;
  --red: #ef4444;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow: 0 1px 2px rgba(16, 24, 40, .04), 0 4px 16px rgba(16, 24, 40, .06);
  --shadow-hover: 0 4px 12px rgba(16, 24, 40, .08), 0 12px 28px rgba(16, 24, 40, .10);
}

* { box-sizing: border-box; }

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

a { color: var(--primary); text-decoration: none; }

/* ---------- 顶部导航 ---------- */
.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, .82);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.topbar-inner {
  max-width: 960px;
  margin: 0 auto;
  padding: 12px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 18px; letter-spacing: .2px; }
.brand .logo {
  width: 34px; height: 34px; border-radius: 10px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  display: grid; place-items: center; color: #fff; font-size: 18px;
}
.topnav { display: flex; gap: 4px; flex-wrap: wrap; }
.topnav a {
  padding: 8px 13px; border-radius: 9px; font-weight: 600; font-size: 14px; color: var(--text-2);
  transition: background .15s, color .15s;
}
.topnav a:hover { background: #eef2f8; color: var(--text); }
.topnav a.active { background: var(--primary); color: #fff; }

/* ---------- 主容器 ---------- */
.wrap { max-width: 960px; margin: 0 auto; padding: 28px 20px 60px; }

/* ---------- Hero ---------- */
.hero {
  background: linear-gradient(135deg, #eef4ff 0%, #eef9ff 100%);
  border: 1px solid #e0ecff;
  border-radius: var(--radius);
  padding: 30px 26px;
  margin-bottom: 26px;
}
.hero h1 { margin: 0 0 6px; font-size: 26px; letter-spacing: .3px; }
.hero p { margin: 0; color: var(--text-2); font-size: 15px; }

/* ---------- 区块标题 ---------- */
.section-title {
  display: flex; align-items: center; gap: 8px;
  font-size: 16px; font-weight: 800; margin: 30px 0 14px; color: var(--text);
}
.section-title::after {
  content: ""; flex: 1; height: 1px; background: var(--border);
}
.section-title .ic { font-size: 18px; }

/* ---------- 卡片栅格 ---------- */
.grid { display: grid; gap: 12px; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); }
.card {
  display: flex; flex-direction: column; gap: 4px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 14px;
  color: var(--text);
  box-shadow: var(--shadow);
  transition: transform .16s, box-shadow .16s, border-color .16s;
}
.card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
  border-color: #cddcf7;
}
.card .c-ic { font-size: 26px; line-height: 1; }
.card .c-t { font-weight: 700; font-size: 15px; }
.card .c-d { font-size: 12.5px; color: var(--text-3); }
.card .c-go { margin-top: 4px; font-size: 12px; color: var(--primary); font-weight: 600; opacity: .8; }

/* ---------- 面板 ---------- */
.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 18px;
  margin-top: 12px;
}
.panel-tabs { display: flex; gap: 6px; margin-bottom: 14px; flex-wrap: wrap; }
.tab {
  padding: 8px 14px; border: 1px solid var(--border); border-radius: 999px;
  background: var(--surface-2); font-size: 13px; font-weight: 600; color: var(--text-2);
  cursor: pointer; transition: background .15s, color .15s, border-color .15s;
}
.tab:hover { border-color: #cbd5e1; }
.tab.active { background: var(--primary); border-color: var(--primary); color: #fff; }

textarea, .preview {
  width: 100%; height: 280px;
  border: 1px solid var(--border); border-radius: var(--radius-sm);
  padding: 14px; margin-bottom: 14px; box-sizing: border-box;
  font-size: 14px;
}
textarea { font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace; resize: vertical; }
textarea:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(37, 99, 235, .12); }
.preview { display: none; overflow-y: auto; background: var(--surface-2); line-height: 1.7; }
.preview img { max-width: 100%; border-radius: 8px; }
.preview code { background: #eef2f7; color: #dc2626; padding: 2px 6px; border-radius: 5px; font-family: monospace; }
.preview pre { background: #111827; color: #f9fafb; padding: 14px; border-radius: 10px; overflow-x: auto; }
.preview pre code { background: transparent; color: inherit; padding: 0; }
.preview blockquote { border-left: 4px solid var(--primary); margin: 0; padding: 6px 12px; color: var(--text-2); background: #eef4ff; border-radius: 0 8px 8px 0; }

.btnrow { display: flex; gap: 10px; }
.btn {
  flex: 1; padding: 12px; border: none; border-radius: var(--radius-sm);
  font-weight: 700; font-size: 15px; cursor: pointer; transition: filter .15s, background .15s;
  color: #fff; background: var(--primary);
}
.btn:hover { filter: brightness(1.05); }
.btn:active { filter: brightness(.95); }
.btn.green { background: var(--green); }
.btn.gray { background: var(--text-3); }

.foot { text-align: center; color: var(--text-3); font-size: 13px; margin-top: 40px; padding-top: 18px; border-top: 1px solid var(--border); }

/* ---------- 响应式 ---------- */
@media (max-width: 640px) {
  .topbar-inner { flex-direction: column; align-items: flex-start; }
  .hero h1 { font-size: 22px; }
  .grid { grid-template-columns: repeat(2, 1fr); }
  .wrap { padding: 20px 14px 48px; }
}