:root {
  --bg: #ffffff;
  --surface: #f7f7f5;
  --surface2: #f0efeb;
  --text: #16161a;
  --text2: #5c5b57;
  --text3: #8a8983;
  --border: rgba(0, 0, 0, 0.09);
  --border2: rgba(0, 0, 0, 0.16);
  --accent: #2f6fed;
  --accent-soft: #eef3fe;
  --ok: #0d8a5f;
  --ok-soft: #e8f6f0;
  --warn: #b7791f;
  --warn-soft: #fdf6e7;
  --err: #c93c37;
  --err-soft: #fdeeee;
  --r: 10px;
  --r-lg: 14px;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.04), 0 8px 24px rgba(0, 0, 0, 0.04);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  font-size: 15px;
}

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

/* ---------- 布局 ---------- */
.wrap { max-width: 1120px; margin: 0 auto; padding: 0 24px; }
.narrow { max-width: 780px; margin: 0 auto; padding: 0 24px; }

/* ---------- 顶栏 ---------- */
header.top {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--border);
}
.top-inner {
  max-width: 1120px; margin: 0 auto; padding: 0 24px;
  height: 60px; display: flex; align-items: center; gap: 32px;
}
.logo { font-size: 17px; font-weight: 600; letter-spacing: -0.3px; color: var(--text); }
.logo:hover { text-decoration: none; }
nav { display: flex; gap: 26px; margin-left: auto; align-items: center; }
nav a { color: var(--text2); font-size: 14px; }
nav a:hover { color: var(--text); text-decoration: none; }
nav a.on { color: var(--text); font-weight: 500; }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  padding: 9px 18px; border-radius: 8px; border: 1px solid transparent;
  font-size: 14px; font-weight: 500; cursor: pointer;
  font-family: inherit; transition: all 0.15s;
}
.btn-primary { background: var(--text); color: #fff; }
.btn-primary:hover { background: #000; text-decoration: none; color: #fff; }
.btn-ghost { border-color: var(--border2); color: var(--text); background: transparent; }
.btn-ghost:hover { background: var(--surface); text-decoration: none; }
.btn-accent { background: var(--accent); color: #fff; }
.btn-accent:hover { background: #2559c4; text-decoration: none; color: #fff; }
.btn-sm { padding: 6px 12px; font-size: 13px; }
.btn:disabled { opacity: 0.45; cursor: not-allowed; }

/* ---------- Hero ---------- */
.hero { padding: 76px 0 60px; text-align: center; }
.eyebrow {
  display: inline-block; font-size: 12px; letter-spacing: 0.4px;
  color: var(--accent); background: var(--accent-soft);
  padding: 5px 13px; border-radius: 20px; margin-bottom: 22px;
}
h1 {
  font-size: 46px; line-height: 1.15; font-weight: 600;
  letter-spacing: -1.4px; margin-bottom: 18px;
}
h1 .dim { color: var(--text3); }
.lede { font-size: 17px; color: var(--text2); max-width: 620px; margin: 0 auto 30px; }

.pill-row { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; margin-bottom: 34px; }
.pill {
  display: inline-flex; align-items: center; gap: 7px;
  font-size: 13px; color: var(--text2);
  background: var(--surface); border: 1px solid var(--border);
  padding: 7px 14px; border-radius: 20px;
}
.pill i { width: 6px; height: 6px; border-radius: 50%; background: var(--ok); display: block; }
.pill.off i { background: var(--text3); }

.code-block {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--r-lg); padding: 18px 22px;
  text-align: left; max-width: 620px; margin: 0 auto 26px;
  font-family: ui-monospace, Menlo, Consolas, monospace; font-size: 13px;
  line-height: 1.85; color: var(--text); overflow-x: auto;
}
.code-block .k { color: #8250df; }
.code-block .s { color: #1a7f37; }
.tabs { display: flex; gap: 4px; margin-bottom: 12px; }
.tab {
  font-size: 13px; padding: 5px 12px; border-radius: 6px; cursor: pointer;
  color: var(--text2); border: 1px solid transparent; font-family: inherit;
}
.tab.on { background: #fff; border-color: var(--border2); color: var(--text); }

/* ---------- 模型广场 ---------- */
.section { padding: 64px 0; }
.section-head { text-align: center; margin-bottom: 40px; }
.section-head h2 { font-size: 30px; font-weight: 600; letter-spacing: -0.7px; margin-bottom: 10px; }
.section-head p { color: var(--text2); font-size: 15px; }

.model-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(238px, 1fr)); gap: 14px;
}
.model-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--r-lg); padding: 20px; transition: all 0.18s;
}
.model-card:hover { border-color: var(--border2); transform: translateY(-2px); box-shadow: var(--shadow); }
.mc-top { display: flex; align-items: center; gap: 9px; margin-bottom: 11px; }
.mc-dot { width: 7px; height: 7px; border-radius: 50%; flex-shrink: 0; }
.mc-name { font-size: 14px; font-weight: 600; letter-spacing: -0.2px; word-break: break-all; }
.mc-desc { font-size: 13px; color: var(--text2); margin-bottom: 13px; }
.mc-foot { display: flex; align-items: center; justify-content: space-between; gap: 8px; }
.tag {
  font-size: 11px; padding: 3px 9px; border-radius: 5px;
  background: var(--ok-soft); color: var(--ok); font-weight: 500;
}
.tag.paid { background: var(--warn-soft); color: var(--warn); }
.mc-price { font-size: 12px; color: var(--text3); font-family: ui-monospace, Menlo, monospace; }

/* ---------- 表格 ---------- */
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th, td { padding: 12px 14px; text-align: left; border-bottom: 1px solid var(--border); }
th { color: var(--text3); font-weight: 500; font-size: 12px; text-transform: uppercase; letter-spacing: 0.3px; }
tbody tr:last-child td { border-bottom: none; }
td.mono, .mono { font-family: ui-monospace, Menlo, Consolas, monospace; font-size: 12.5px; }

/* ---------- 表单 ---------- */
.field { margin-bottom: 16px; }
label { display: block; font-size: 13px; color: var(--text2); margin-bottom: 6px; }
input, select, textarea {
  width: 100%; padding: 10px 13px; font-size: 14px; font-family: inherit;
  border: 1px solid var(--border2); border-radius: 8px;
  background: #fff; color: var(--text); outline: none; transition: border-color 0.15s;
}
input:focus, select:focus, textarea:focus { border-color: var(--accent); }

/* ---------- 卡片/面板 ---------- */
.card {
  background: #fff; border: 1px solid var(--border);
  border-radius: var(--r-lg); padding: 24px; margin-bottom: 18px;
}
.card h3 { font-size: 16px; font-weight: 600; margin-bottom: 14px; }
.card-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 14px; gap: 12px; flex-wrap: wrap; }
.card-head h3 { margin: 0; }

.stat-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(128px, 1fr)); gap: 12px; margin-bottom: 22px; }
.stat { background: var(--surface); border: 1px solid var(--border); border-radius: var(--r); padding: 15px; }
.stat-label { font-size: 12px; color: var(--text3); margin-bottom: 5px; }
.stat-value { font-size: 22px; font-weight: 600; letter-spacing: -0.5px; }

.alert { padding: 11px 15px; border-radius: 8px; font-size: 13.5px; margin-bottom: 14px; }
.alert-err { background: var(--err-soft); color: var(--err); }
.alert-ok { background: var(--ok-soft); color: var(--ok); }
.alert-warn { background: var(--warn-soft); color: var(--warn); }

.empty { text-align: center; padding: 40px 20px; color: var(--text3); font-size: 14px; }

.key-row {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 14px 0; border-bottom: 1px solid var(--border); flex-wrap: wrap;
}
.key-row:last-child { border-bottom: none; }
.key-info { flex: 1; min-width: 180px; }
.key-name { font-size: 14px; font-weight: 500; margin-bottom: 3px; }
.key-meta { font-size: 12px; color: var(--text3); }

.reveal {
  background: var(--surface); border: 1px dashed var(--border2);
  border-radius: 8px; padding: 14px; margin-bottom: 14px;
  font-family: ui-monospace, Menlo, Consolas, monospace; font-size: 13px; word-break: break-all;
}

footer {
  border-top: 1px solid var(--border); padding: 28px 0; margin-top: 60px;
  color: var(--text3); font-size: 13px;
}
footer .wrap { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }

.hidden { display: none !important; }

.chat-wrap { max-width: 820px; margin: 0 auto; }
.chat-log {
  min-height: 260px; max-height: 520px; overflow-y: auto;
  border: 1px solid var(--border); border-radius: var(--r-lg);
  padding: 20px; margin-bottom: 16px; background: var(--surface);
}
.msg { margin-bottom: 16px; }
.msg:last-child { margin-bottom: 0; }
.msg-role { font-size: 12px; color: var(--text3); margin-bottom: 5px; font-weight: 500; }
.msg-body { font-size: 14.5px; line-height: 1.75; white-space: pre-wrap; word-break: break-word; }

@media (max-width: 720px) {
  h1 { font-size: 32px; }
  .hero { padding: 48px 0 40px; }
  nav { gap: 16px; }
  nav a.hide-sm { display: none; }
  .wrap, .narrow, .top-inner { padding: 0 18px; }
  .section { padding: 44px 0; }
}