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

:root {
  --bg:        #f8f7f4;
  --surface:   #ffffff;
  --border:    rgba(0,0,0,0.10);
  --border-md: rgba(0,0,0,0.18);
  --text:      #1a1a18;
  --muted:     #6b6b66;
  --hint:      #9a9a94;
  --accent:    #4f46e5;
  --accent-bg: #eeedfe;
  --success:   #1D9E75;
  --success-bg:#e1f5ee;
  --warn:      #BA7517;
  --warn-bg:   #faeeda;
  --danger:    #E24B4A;
  --danger-bg: #fcebeb;
  --radius-sm: 6px;
  --radius:    10px;
  --radius-lg: 14px;
  --shadow:    0 1px 3px rgba(0,0,0,0.07), 0 1px 2px rgba(0,0,0,0.05);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg:        #18181a;
    --surface:   #222226;
    --border:    rgba(255,255,255,0.10);
    --border-md: rgba(255,255,255,0.18);
    --text:      #e8e8e4;
    --muted:     #9a9a94;
    --hint:      #6b6b66;
    --accent:    #7f77dd;
    --accent-bg: #26215c;
    --success:   #5dcaa5;
    --success-bg:#04342c;
    --warn:      #ef9f27;
    --warn-bg:   #412402;
    --danger:    #f09595;
    --danger-bg: #501313;
  }
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  font-size: 15px;
}

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

button {
  cursor: pointer;
  font-family: inherit;
  font-size: 14px;
  border: 1px solid var(--border-md);
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--text);
  padding: 8px 16px;
  transition: background 0.15s, opacity 0.15s;
}
button:hover  { background: var(--bg); }
button:active { opacity: 0.8; }
button.primary {
  background: var(--accent);
  color: #fff;
  border-color: transparent;
  font-weight: 500;
}
button.primary:hover { opacity: 0.9; background: var(--accent); }
button.success {
  background: var(--success);
  color: #fff;
  border-color: transparent;
  font-weight: 500;
}
button.danger {
  background: var(--danger);
  color: #fff;
  border-color: transparent;
}

input, select, textarea {
  font-family: inherit;
  font-size: 14px;
  border: 1px solid var(--border-md);
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--text);
  padding: 8px 12px;
  width: 100%;
  outline: none;
  transition: border-color 0.15s;
}
input:focus, select:focus, textarea:focus {
  border-color: var(--accent);
}

/* Layout */
.page  { max-width: 960px; margin: 0 auto; padding: 24px 16px 80px; }
.card  { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 20px 24px; }
.row   { display: flex; gap: 12px; align-items: center; }
.col   { display: flex; flex-direction: column; gap: 12px; }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.grid3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.grid4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }

@media (max-width: 600px) {
  .grid2, .grid3, .grid4 { grid-template-columns: 1fr; }
}

/* Typography */
h1 { font-size: 22px; font-weight: 600; }
h2 { font-size: 18px; font-weight: 600; }
h3 { font-size: 15px; font-weight: 600; }
.muted  { color: var(--muted); font-size: 13px; }
.hint   { color: var(--hint);  font-size: 12px; }
.label  { font-size: 12px; font-weight: 500; color: var(--muted); text-transform: uppercase; letter-spacing: 0.04em; }

/* Badges */
.badge {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 99px;
  background: var(--accent-bg);
  color: var(--accent);
}
.badge.success { background: var(--success-bg); color: var(--success); }
.badge.warn    { background: var(--warn-bg);    color: var(--warn); }
.badge.danger  { background: var(--danger-bg);  color: var(--danger); }

/* Progress bar */
.progress-bar { height: 6px; background: var(--border); border-radius: 99px; overflow: hidden; }
.progress-bar-fill { height: 100%; border-radius: 99px; background: var(--accent); transition: width 0.4s ease; }
.progress-bar-fill.success { background: var(--success); }
.progress-bar-fill.warn    { background: var(--warn); }

/* Divider */
.divider { border: none; border-top: 1px solid var(--border); margin: 16px 0; }

/* Spinner */
@keyframes spin { to { transform: rotate(360deg); } }
.spinner {
  width: 24px; height: 24px;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}
.spinner-center { display: flex; justify-content: center; align-items: center; padding: 48px; }

/* Empty state */
.empty { text-align: center; padding: 48px 24px; color: var(--muted); }

/* Form group */
.form-group { display: flex; flex-direction: column; gap: 6px; }
.form-group label { font-size: 13px; font-weight: 500; color: var(--muted); }

/* Option card (for subject/role selection) */
.option-card {
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
  background: var(--surface);
}
.option-card:hover  { border-color: var(--accent); background: var(--accent-bg); }
.option-card.active { border-color: var(--accent); background: var(--accent-bg); }