/* Shared design tokens + base components (login pages and the main app). */
:root {
  --bg: #eef1f6; --surface: #ffffff; --surface-2: #f5f7fb; --surface-3: #e9edf4;
  --text: #1a2230; --muted: #667085; --border: #d8dee9; --border-strong: #b9c2d3;
  --accent: #3563e9; --accent-hover: #2850c8; --accent-contrast: #ffffff; --accent-soft: #e6edff;
  --danger: #d92d20; --danger-soft: #fde8e6; --ok: #12924a; --ok-soft: #e1f6ea; --warn: #b54708; --warn-soft: #fff1e0;
  --shadow-sm: 0 1px 2px rgba(16,24,40,.08);
  --shadow-md: 0 4px 14px rgba(16,24,40,.10), 0 1px 3px rgba(16,24,40,.08);
  --shadow-lg: 0 14px 40px rgba(16,24,40,.22), 0 3px 8px rgba(16,24,40,.10);
  --radius: 10px; --radius-sm: 6px;
  --belt: #2c8a52; --belt-fill: rgba(44,138,82,.20);
  --belt2: #d63a4f; --belt2-fill: rgba(214,58,79,.16);
  --material: #8a6330; --material-fill: rgba(176,128,62,.62);
  --skirt: #6b7686; --grid: rgba(102,112,133,.22);
  --font: Inter, "Segoe UI", system-ui, -apple-system, Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  color-scheme: light;
}
:root[data-theme="dark"] {
  --bg: #0d1219; --surface: #161d28; --surface-2: #1b2431; --surface-3: #222d3d;
  --text: #e5eaf2; --muted: #93a0b4; --border: #2a3546; --border-strong: #3a475c;
  --accent: #6c8fff; --accent-hover: #86a3ff; --accent-contrast: #0b1020; --accent-soft: #1d2a4d;
  --danger: #ff6b5e; --danger-soft: #3b1a18; --ok: #3ddc84; --ok-soft: #12301f; --warn: #ffb35c; --warn-soft: #382612;
  --shadow-sm: 0 1px 2px rgba(0,0,0,.4);
  --shadow-md: 0 4px 14px rgba(0,0,0,.45);
  --shadow-lg: 0 14px 40px rgba(0,0,0,.65), 0 3px 8px rgba(0,0,0,.4);
  --belt: #49b878; --belt-fill: rgba(73,184,120,.22);
  --belt2: #ff6b7e; --belt2-fill: rgba(255,107,126,.18);
  --material: #d3a05a; --material-fill: rgba(196,146,76,.55);
  --skirt: #9aa6b8; --grid: rgba(147,160,180,.18);
  color-scheme: dark;
}
* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }
body { font-family: var(--font); font-size: 14px; line-height: 1.45; color: var(--text); background: var(--bg); -webkit-font-smoothing: antialiased; }
button, input, select, textarea { font: inherit; color: inherit; }
h1, h2, h3 { margin: 0; font-weight: 650; }
a { color: var(--accent); }

.btn { display: inline-flex; align-items: center; justify-content: center; gap: 6px; padding: 7px 14px; border-radius: var(--radius-sm);
  border: 1px solid var(--border-strong); background: var(--surface); cursor: pointer; font-weight: 550; transition: background .12s, border-color .12s; }
.btn:hover { background: var(--surface-2); }
.btn:disabled { opacity: .55; cursor: not-allowed; }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-contrast); }
.btn.primary:hover { background: var(--accent-hover); }
.btn.danger { color: var(--danger); border-color: var(--danger); }
.btn.sm { padding: 3px 9px; font-size: 12.5px; }
.btn.ghost { border-color: transparent; background: transparent; }
.btn.ghost:hover { background: var(--surface-3); }
.btn svg { width: 16px; height: 16px; }

.input, .select { width: 100%; padding: 8px 10px; border: 1px solid var(--border-strong); border-radius: var(--radius-sm); background: var(--surface); outline: none; }
.input:focus, .select:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
.input.bad { border-color: var(--danger); box-shadow: 0 0 0 3px var(--danger-soft); }
label.lbl { display: block; font-size: 12.5px; font-weight: 600; color: var(--muted); margin-bottom: 4px; }

.alert { padding: 9px 12px; border-radius: var(--radius-sm); font-size: 13px; border: 1px solid transparent; }
.alert.error { background: var(--danger-soft); color: var(--danger); border-color: var(--danger); }
.alert.ok { background: var(--ok-soft); color: var(--ok); border-color: var(--ok); }
.alert.warn { background: var(--warn-soft); color: var(--warn); border-color: var(--warn); }
.hidden { display: none !important; }

/* ---- login / invitation pages ---- */
.auth-wrap { min-height: 100%; display: grid; place-items: center; padding: 24px;
  background: radial-gradient(1000px 500px at 15% -10%, var(--accent-soft), transparent 60%), var(--bg); }
.auth-card { width: min(420px, 100%); background: var(--surface); border: 1px solid var(--border); border-radius: 16px; box-shadow: var(--shadow-lg); padding: 30px 28px; }
.auth-brand { display: flex; align-items: center; gap: 12px; margin-bottom: 22px; }
.auth-brand img { width: 40px; height: 40px; }
.auth-brand h1 { font-size: 19px; }
.auth-brand p { margin: 0; color: var(--muted); font-size: 12.5px; }
.auth-form { display: grid; gap: 14px; }
.auth-foot { margin-top: 18px; text-align: center; color: var(--muted); font-size: 12px; }
.theme-fab { position: fixed; top: 14px; right: 14px; }