:root,
[data-theme="dark"] {
  color-scheme: dark;
  --bg: #0b1220;
  --bg-elev: #121c2e;
  --bg-panel: #162338;
  --line: #24344d;
  --text: #e8eef6;
  --muted: #9aabc0;
  --accent: #2e6bb8;
  --accent-2: #7eb3e8;
  --danger: #c94c4c;
  --ok: #3d9b7a;
  --glow-a: #1a3a68;
  --glow-b: #0f2748;
  --font-display: "Segoe UI", "Trebuchet MS", sans-serif;
  --font-body: "Segoe UI", "Trebuchet MS", sans-serif;
}

[data-theme="light"] {
  color-scheme: light;
  --bg: #f3f6fb;
  --bg-elev: #ffffff;
  --bg-panel: #ffffff;
  --line: #d5deea;
  --text: #122033;
  --muted: #5c6d82;
  --accent: #1f4f8a;
  --accent-2: #2e6bb8;
  --danger: #c94c4c;
  --ok: #2a8a64;
  --glow-a: #c5d8f0;
  --glow-b: #dce7f5;
}

* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; }
body {
  font-family: var(--font-body);
  background:
    radial-gradient(1200px 600px at 8% -12%, var(--glow-a) 0%, transparent 55%),
    radial-gradient(900px 500px at 100% 0%, var(--glow-b) 0%, transparent 48%),
    var(--bg);
  color: var(--text);
}
a { color: inherit; text-decoration: none; }
.muted { color: var(--muted); }
.hint { margin: 0 0 .9rem; }
.flash-wrap { position: fixed; top: 1rem; right: 1rem; z-index: 50; display: grid; gap: .5rem; }
.flash { margin: 0; padding: .7rem 1rem; border-radius: .4rem; background: var(--bg-panel); border: 1px solid var(--line); }
.flash-danger { border-color: var(--danger); }
.flash-success { border-color: var(--ok); }
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  border: 0; border-radius: .4rem; padding: .7rem 1rem; cursor: pointer;
  font: inherit; font-weight: 600;
}
.btn-primary { background: var(--accent); color: #f4f8ff; }
.btn-primary:hover { filter: brightness(1.08); }
.btn-ghost {
  background: transparent;
  color: var(--accent-2);
  border: 1px solid var(--line);
  padding: .35rem .7rem;
  font-size: .85rem;
}
.btn-ghost:hover { border-color: var(--accent-2); }
.theme-toggle {
  width: 2.2rem;
  height: 2.2rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--bg-panel);
  color: var(--text);
  cursor: pointer;
  display: inline-grid;
  place-items: center;
  padding: 0;
}
.theme-toggle:hover { border-color: var(--accent-2); }
.theme-toggle svg { width: 1.05rem; height: 1.05rem; }
.theme-toggle .icon-sun { display: none; }
.theme-toggle .icon-moon { display: block; }
[data-theme="light"] .theme-toggle .icon-sun { display: block; }
[data-theme="light"] .theme-toggle .icon-moon { display: none; }