:root {
  --blue: #2178af;   --blue-dark: #0d5973; --blue-tint: #e7eff2;
  --coral: #f66951;  --coral-dark: #f24122; --coral-light: #fa9482;
  --star: #fdc173;   --gold: #fdc239;      --sunshine: #fff7e6;
  --sky: #52c7eb;    --aqua: #82d7dd;      --teal: #2d8086;   --mint: #87d4b6;
  --lavender: #eee2f7; --blue-pale: #dcf1f3; --lime: #b2e3aa;
  --cream: #fffef9;  --paper: #f6f5ed;
  --ink: #212121;    --ink-soft: #6b6b6b;  --navy: #062935;
  --lavender-purple: #a78bda;

  --font-head: 'Fraunces', Georgia, serif;
  --font-body: 'Nunito', system-ui, sans-serif;

  --radius-card: 16px;
  --radius-btn: 12px;
  --shadow-soft: 0 2px 8px rgba(6, 41, 53, .08);
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--cream);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.5;
}
h1, h2, h3, h4 { font-family: var(--font-head); color: var(--navy); margin: 0 0 .5em; }
a { color: var(--blue); }
button { font-family: inherit; }

/* ---------- student color tints (used as data-color="sky" etc.) ---------- */
[data-color="coral"] { --tint: #fde3de; --strong: var(--coral); }
[data-color="sky"] { --tint: var(--blue-pale); --strong: var(--sky); }
[data-color="mint"] { --tint: #e2f5ec; --strong: var(--mint); }
[data-color="gold"] { --tint: var(--sunshine); --strong: var(--gold); }
[data-color="lavender"] { --tint: var(--lavender); --strong: var(--lavender-purple); }
[data-color="teal"] { --tint: var(--blue-pale); --strong: var(--teal); }

/* ---------- primitives ---------- */
.card {
  background: #fff;
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-soft);
  padding: 1.25rem;
}
.card.tinted { background: var(--tint, var(--paper)); }

.btn {
  display: inline-flex; align-items: center; gap: .4em;
  border: none; border-radius: var(--radius-btn);
  padding: .6em 1.2em; font-weight: 700; cursor: pointer;
  font-size: 1rem; transition: transform .1s ease, box-shadow .1s ease;
  background: var(--blue-pale); color: var(--navy);
}
.btn:hover { transform: translateY(-1px); box-shadow: var(--shadow-soft); }
.btn:active { transform: translateY(0); }
.btn-coral { background: var(--coral); color: #fff; }
.btn-coral:hover { background: var(--coral-dark); }
.btn-blue { background: var(--blue); color: #fff; }
.btn-blue:hover { background: var(--blue-dark); }
.btn-ghost { background: transparent; color: var(--blue); }
.btn-sm { padding: .35em .8em; font-size: .875rem; }
.btn[disabled] { opacity: .5; cursor: not-allowed; transform: none; }

.chip {
  display: inline-flex; align-items: center; gap: .3em;
  background: var(--blue-pale); color: var(--navy);
  border-radius: 999px; padding: .25em .75em; font-size: .8rem; font-weight: 700;
}
.badge {
  display: inline-block; background: var(--gold); color: var(--navy);
  border-radius: 999px; padding: .1em .6em; font-size: .7rem; font-weight: 800;
  text-transform: uppercase; letter-spacing: .02em;
}

input, select, textarea {
  font-family: inherit; font-size: 1rem;
  border: 1px solid #e0ded2; border-radius: 10px;
  padding: .55em .75em; width: 100%; background: #fff; color: var(--ink);
}
input:focus, select:focus, textarea:focus { outline: 2px solid var(--sky); }
label { display: block; font-weight: 700; font-size: .85rem; margin-bottom: .3em; color: var(--ink-soft); }
.field { margin-bottom: 1rem; }
.field-error { color: var(--coral-dark); font-size: .8rem; margin-top: .3em; }
.field.has-error input, .field.has-error select, .field.has-error textarea { border-color: var(--coral); }

.empty-state {
  text-align: center; padding: 2.5rem 1rem; color: var(--ink-soft);
}
.empty-state .emoji { font-size: 2.5rem; display: block; margin-bottom: .5rem; }

.toast {
  position: fixed; bottom: 1.5rem; left: 50%; transform: translateX(-50%);
  background: var(--navy); color: #fff; padding: .75em 1.25em; border-radius: var(--radius-btn);
  box-shadow: var(--shadow-soft); z-index: 1000; font-weight: 600;
}
.toast.error { background: var(--coral-dark); }

.modal-backdrop {
  position: fixed; inset: 0; background: rgba(6, 41, 53, .35);
  display: flex; align-items: center; justify-content: center; z-index: 900; padding: 1rem;
}
.modal {
  background: #fff; border-radius: var(--radius-card); box-shadow: var(--shadow-soft);
  padding: 1.5rem; max-width: 560px; width: 100%; max-height: 90vh; overflow-y: auto;
}
.modal-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 1rem; }
.modal-close { background: none; border: none; font-size: 1.4rem; cursor: pointer; color: var(--ink-soft); }

.confirm-actions { display: flex; gap: .5rem; justify-content: flex-end; margin-top: 1rem; }

table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: .5em .6em; border-bottom: 1px solid #eee; }
th { color: var(--ink-soft); font-size: .8rem; text-transform: uppercase; letter-spacing: .03em; }

::-webkit-scrollbar { height: 8px; width: 8px; }
::-webkit-scrollbar-thumb { background: #ddd; border-radius: 4px; }

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-8px); }
  75% { transform: translateX(8px); }
}