:root {
  color-scheme: light;
  --surface-1: #fcfcfb;
  --plane: #f9f9f7;
  --text-primary: #0b0b0b;
  --text-secondary: #52514e;
  --muted: #898781;
  --grid: #e1e0d9;
  --baseline: #c3c2b7;
  --border: rgba(11,11,11,0.10);
  --series-1: #2a78d6;
  --series-1-wash: rgba(42,120,214,0.10);
  --series-3: #1baf7a;
  --series-3-wash: rgba(27,175,122,0.12);
  --success: #006300;
  --field: #ffffff;
}
@media (prefers-color-scheme: dark) {
  :root:where(:not([data-theme="light"])) {
    color-scheme: dark;
    --surface-1: #1a1a19;
    --plane: #0d0d0d;
    --text-primary: #ffffff;
    --text-secondary: #c3c2b7;
    --muted: #898781;
    --grid: #2c2c2a;
    --baseline: #383835;
    --border: rgba(255,255,255,0.10);
    --series-1: #3987e5;
    --series-1-wash: rgba(57,135,229,0.14);
    --series-3: #199e70;
    --series-3-wash: rgba(25,158,112,0.16);
    --success: #0ca30c;
    --field: #232322;
  }
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --surface-1: #1a1a19;
  --plane: #0d0d0d;
  --text-primary: #ffffff;
  --text-secondary: #c3c2b7;
  --muted: #898781;
  --grid: #2c2c2a;
  --baseline: #383835;
  --border: rgba(255,255,255,0.10);
  --series-1: #3987e5;
  --series-1-wash: rgba(57,135,229,0.14);
  --series-3: #199e70;
  --series-3-wash: rgba(25,158,112,0.16);
  --success: #0ca30c;
  --field: #232322;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--plane);
  color: var(--text-primary);
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  font-size: 15px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}
.wrap { max-width: 940px; margin: 0 auto; padding: 28px 20px 72px; }

.theme-btn {
  flex: none; background: var(--surface-1); color: var(--text-secondary);
  border: 1px solid var(--border); border-radius: 8px; padding: 7px 12px;
  font: inherit; font-size: 13px; cursor: pointer;
}
.theme-btn:hover { color: var(--text-primary); }

.btn {
  background: var(--series-1); color: #fff; border: none; border-radius: 8px;
  padding: 9px 15px; font: inherit; font-size: 13.5px; font-weight: 550; cursor: pointer;
  text-decoration: none; display: inline-block;
}
.btn:hover { filter: brightness(1.06); }
.btn.ghost { background: transparent; color: var(--text-secondary); border: 1px solid var(--border); }
.btn.ghost:hover { color: var(--text-primary); }