/* ── Reset & Base ───────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --color-bg: #f5f5f5;
  --color-surface: #ffffff;
  --color-text: #1a1a1a;
  --color-text-muted: #666;
  --color-border: #ddd;
  --color-primary: #2563eb;
  --color-primary-hover: #1d4ed8;
  --color-danger: #dc2626;

  /* Category colors */
  --cat-gen-ed: #3b82f6;
  --cat-core: #8b5cf6;
  --cat-major: #059669;
  --cat-distributive: #d97706;
  --cat-elective: #6b7280;

  --radius: 6px;
  --shadow: 0 1px 3px rgba(0,0,0,0.1);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.5;
  min-height: 100vh;
}

/* ── Controls / Header ─────────────────────────────── */
.controls {
  background: var(--color-surface);
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow);
  position: sticky;
  top: 0;
  z-index: 100;
}

.controls__title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.controls__row {
  display: flex;
  align-items: flex-end;
  gap: 1rem;
  flex-wrap: wrap;
}

.controls__label {
  display: flex;
  flex-direction: column;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--color-text-muted);
  gap: 0.25rem;
}

.controls__select {
  font-size: 0.9rem;
  padding: 0.4rem 0.6rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-surface);
  min-width: 200px;
}

.controls__buttons {
  display: flex;
  gap: 0.5rem;
}

.controls__info {
  margin-top: 0.5rem;
  font-size: 0.85rem;
  color: var(--color-text-muted);
  display: flex;
  gap: 1.5rem;
}

.controls__alias {
  color: var(--color-primary);
  font-style: italic;
}

.btn {
  padding: 0.4rem 1rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 0.85rem;
  cursor: pointer;
  transition: background 0.15s;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn--primary {
  background: var(--color-primary);
  color: white;
  border-color: var(--color-primary);
}

.btn--primary:hover:not(:disabled) {
  background: var(--color-primary-hover);
}

.btn--secondary {
  background: var(--color-surface);
}

.btn--secondary:hover:not(:disabled) {
  background: #f0f0f0;
}

/* ── Term Grid ─────────────────────────────────────── */
.term-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
  padding: 1.5rem;
  align-items: start;
}

.term-column {
  background: var(--color-surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  border: 2px solid transparent;
  min-height: 200px;
  transition: border-color 0.15s;
}

.term-column.drag-over {
  border-color: var(--color-primary);
  background: #eff6ff;
}

.term-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--color-border);
  font-weight: 600;
  font-size: 0.9rem;
}

.term-header__credits {
  font-weight: 500;
  font-size: 0.8rem;
  padding: 0.15rem 0.5rem;
  border-radius: 999px;
  background: #e5e7eb;
}

.term-header__credits.over-limit {
  background: #fee2e2;
  color: var(--color-danger);
  font-weight: 600;
}

.term-courses {
  padding: 0.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  min-height: 100px;
}

/* ── Course Cards ──────────────────────────────────── */
.course-card {
  padding: 0.5rem 0.75rem;
  border-radius: 4px;
  border-left: 4px solid var(--cat-gen-ed);
  background: #fafafa;
  font-size: 0.82rem;
  cursor: grab;
  transition: box-shadow 0.15s, opacity 0.15s;
  user-select: none;
}

.course-card:active { cursor: grabbing; }
.course-card.dragging { opacity: 0.4; }

.course-card[data-category-type="gen-ed"]      { border-left-color: var(--cat-gen-ed); }
.course-card[data-category-type="core"]         { border-left-color: var(--cat-core); }
.course-card[data-category-type="major"]        { border-left-color: var(--cat-major); }
.course-card[data-category-type="distributive"] { border-left-color: var(--cat-distributive); }
.course-card[data-category-type="elective"]     { border-left-color: var(--cat-elective); }

.course-card:hover {
  box-shadow: 0 2px 6px rgba(0,0,0,0.12);
}

.course-card__header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
}

.course-card__code {
  font-weight: 600;
  font-size: 0.8rem;
}

.course-card__credits {
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

.course-card__title {
  font-size: 0.78rem;
  color: var(--color-text-muted);
  margin-top: 0.1rem;
  line-height: 1.3;
}

/* Course card with dropdown (pick rule) */
.course-card--pick {
  cursor: default;
}

.course-card--pick select {
  width: 100%;
  font-size: 0.8rem;
  margin-top: 0.25rem;
  padding: 0.2rem;
  border: 1px solid var(--color-border);
  border-radius: 3px;
}

/* Open elective */
.course-card--elective {
  border-left-color: var(--cat-elective);
  cursor: default;
}

.course-card--elective input {
  width: 100%;
  font-size: 0.8rem;
  margin-top: 0.25rem;
  padding: 0.2rem 0.4rem;
  border: 1px solid var(--color-border);
  border-radius: 3px;
}

/* ── Grade Select ──────────────────────────────────── */
.course-card__grade {
  display: flex;
  justify-content: flex-end;
  margin-top: 0.2rem;
}

.grade-select {
  font-size: 0.7rem;
  padding: 0.05rem 0.2rem;
  border: 1px solid var(--color-border);
  border-radius: 3px;
  background: var(--color-surface);
  color: var(--color-text-muted);
  width: 3.5rem;
  cursor: pointer;
}

/* ── Print Header (on-screen student fields) ──────── */
.print-header {
  margin-top: 0.5rem;
  display: flex;
  gap: 1.5rem;
  align-items: center;
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.print-header__input {
  font-size: 0.85rem;
  padding: 0.3rem 0.5rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  width: 200px;
  margin-left: 0.25rem;
}

/* ── Print Layout (hidden on screen) ──────────────── */
.print-layout { display: none; }

/* ── Legend ─────────────────────────────────────────── */
.legend {
  padding: 0.75rem 1.5rem;
  border-top: 1px solid var(--color-border);
  background: var(--color-surface);
}

.legend__items {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
  font-size: 0.8rem;
}

.legend__item {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.legend__swatch {
  width: 14px;
  height: 14px;
  border-radius: 3px;
}

/* ── Empty state ───────────────────────────────────── */
.empty-state {
  grid-column: 1 / -1;
  text-align: center;
  padding: 4rem 2rem;
  color: var(--color-text-muted);
  font-size: 1rem;
}

/* ── Responsive ────────────────────────────────────── */
@media (max-width: 768px) {
  .term-grid {
    grid-template-columns: 1fr;
    padding: 1rem;
  }
  .controls__row {
    flex-direction: column;
    align-items: stretch;
  }
  .controls__select {
    min-width: unset;
  }
}