/* ============================================================
   StudyTracker – Main Stylesheet
   ============================================================ */

/* Variables */
:root {
  /* Backgrounds */
  --bg-base:        #0d1b2e;
  --bg-header:      #0a1628;
  --bg-card:        #132338;
  --bg-card-hover:  #1a2e49;
  --bg-input:       #0d1b2e;

  /* Overlays — for hover states on rows/items */
  --overlay-sm:     rgba(255,255,255,0.04);
  --overlay-md:     rgba(255,255,255,0.06);

  /* Borders */
  --border:         rgba(255,255,255,0.08);
  --border-strong:  rgba(255,255,255,0.15);

  /* Accent */
  --accent:         #3b82f6;
  --accent-hover:   #2563eb;
  --accent-dim:     rgba(59,130,246,0.12);

  /* Semantic */
  --success:        #22c55e;
  --success-dim:    rgba(34,197,94,0.15);
  --warning:        #f59e0b;
  --warning-dim:    rgba(245,158,11,0.15);
  --danger:         #ef4444;
  --danger-dim:     rgba(239,68,68,0.15);

  /* Text */
  --text:           #e2eaf4;
  --text-muted:     #7a9bb5;
  --text-dim:       #3d5a73;

  /* Shape & motion */
  --radius:         8px;
  --radius-sm:      5px;
  --radius-lg:      12px;
  --radius-pill:    99px;
  --shadow:         0 4px 24px rgba(0,0,0,0.35);
  --transition:     150ms ease;

  /* Layout */
  --header-h:       56px;
  --max-width:      1280px;
}

/* ── Reset ─────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scrollbar-gutter: stable; }
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  background: var(--bg-base);
  color: var(--text);
  line-height: 1.5;
  min-height: 100vh;
}
a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-hover); }
button { font: inherit; cursor: pointer; border: none; background: none; }
input, select, textarea { font: inherit; }
ul, ol { list-style: none; }
img { display: block; max-width: 100%; }
fieldset { border: 1px solid var(--border); border-radius: var(--radius); padding: 1rem; }
legend { padding: 0 .5rem; font-size: .85rem; font-weight: 600; color: var(--text-muted); text-transform: uppercase; letter-spacing: .05em; }

/* ── Typography ─────────────────────────────────────────────── */
h1 { font-size: 1.5rem; font-weight: 700; }
h2 { font-size: 1.2rem; font-weight: 600; }
h3 { font-size: 1rem;   font-weight: 600; }
p  { color: var(--text-muted); }

/* ── Header ────────────────────────────────────────────────── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-h);
  background: var(--bg-header);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.25rem;
  height: 100%;
  display: flex;
  align-items: center;
  gap: 1rem;
}
.site-logo {
  font-weight: 800;
  font-size: 1.1rem;
  color: var(--text);
  letter-spacing: -.02em;
  white-space: nowrap;
}
.site-logo:hover { color: var(--accent); }

.header-nav {
  display: flex;
  gap: .25rem;
  flex: 1;
  margin-left: .5rem;
}
.nav-link {
  padding: .375rem .75rem;
  border-radius: var(--radius-sm);
  font-size: .9rem;
  color: var(--text-muted);
  transition: background var(--transition), color var(--transition);
}
.nav-link:hover, .nav-link.active {
  background: rgba(255,255,255,0.07);
  color: var(--text);
}

.header-right {
  display: flex;
  align-items: center;
  gap: .5rem;
  margin-left: auto;
}

.semester-badge {
  background: rgba(59,130,246,0.15);
  border: 1px solid rgba(59,130,246,0.3);
  color: var(--accent);
  font-size: .78rem;
  font-weight: 600;
  padding: .25rem .6rem;
  border-radius: 20px;
  white-space: nowrap;
}

.btn-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  transition: background var(--transition), color var(--transition);
}
.btn-icon:hover { background: rgba(255,255,255,0.08); color: var(--text); }

.hamburger { display: none; }

/* ── Main ───────────────────────────────────────────────────── */
.site-main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1.5rem 1.25rem 4rem;
}

/* ── Auth pages ─────────────────────────────────────────────── */
body.auth-page {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 1rem;
}
.auth-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  width: 100%;
  max-width: 380px;
  box-shadow: var(--shadow);
}
.auth-card--wide { max-width: 560px; }
.auth-logo {
  font-size: 1.8rem;
  font-weight: 800;
  text-align: center;
  margin-bottom: .25rem;
}
.auth-sub {
  text-align: center;
  font-size: .9rem;
  color: var(--text-muted);
  margin-bottom: 2rem;
}
.auth-form { display: flex; flex-direction: column; gap: 1.25rem; }

/* ── Buttons ────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .4rem;
  padding: .5rem 1rem;
  border-radius: var(--radius-sm);
  font-size: .875rem;
  font-weight: 500;
  transition: background var(--transition), opacity var(--transition);
  white-space: nowrap;
}
.btn-primary {
  background: var(--accent);
  color: #fff;
}
.btn-primary:hover { background: var(--accent-hover); color: #fff; }
.btn-ghost {
  background: transparent;
  border: 1px solid var(--border-strong);
  color: var(--text-muted);
}
.btn-ghost:hover { background: rgba(255,255,255,0.06); color: var(--text); }
.btn-danger {
  background: var(--danger-dim);
  border: 1px solid rgba(239,68,68,0.3);
  color: var(--danger);
}
.btn-danger:hover { background: rgba(239,68,68,0.25); }
.btn-sm { padding: .3rem .65rem; font-size: .8rem; }
.btn-block { width: 100%; }
.btn-icon-text {
  display: inline-flex;
  align-items: center;
  gap: .35rem;
  color: var(--text-muted);
  font-size: .85rem;
  padding: .3rem .6rem;
  border-radius: var(--radius-sm);
  transition: background var(--transition), color var(--transition);
}
.btn-icon-text:hover { background: rgba(255,255,255,0.06); color: var(--text); }
.btn-icon-text svg { flex-shrink: 0; }

/* ── Forms ──────────────────────────────────────────────────── */
.form-group {
  display: flex;
  flex-direction: column;
  gap: .35rem;
  flex: 1;
}
.form-group label {
  font-size: .8rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: .04em;
}
.form-input, .form-select, .form-textarea {
  background: var(--bg-input);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  color: var(--text);
  padding: .5rem .75rem;
  transition: border-color var(--transition);
  width: 100%;
}
.form-input:focus, .form-select:focus, .form-textarea:focus {
  outline: none;
  border-color: var(--accent);
}
.form-select option { background: var(--bg-card-hover); }
.form-textarea { resize: vertical; min-height: 80px; }
.form-row {
  display: flex;
  gap: 1rem;
}
.form-check {
  display: flex;
  align-items: center;
  gap: .5rem;
  font-size: .9rem;
  cursor: pointer;
}
.form-check input[type="checkbox"] {
  width: 16px;
  height: 16px;
  accent-color: var(--accent);
  cursor: pointer;
}
.form-hint {
  font-size: .78rem;
  color: var(--text-dim);
}

/* ── Alerts ─────────────────────────────────────────────────── */
.alert {
  padding: .75rem 1rem;
  border-radius: var(--radius-sm);
  font-size: .875rem;
}
.alert-danger  { background: var(--danger-dim);  border: 1px solid rgba(239,68,68,0.3);  color: #fca5a5; }
.alert-success { background: var(--success-dim); border: 1px solid rgba(34,197,94,0.3);  color: #86efac; }
.alert-warning { background: var(--warning-dim); border: 1px solid rgba(245,158,11,0.3); color: #fcd34d; }

/* ── Cards ──────────────────────────────────────────────────── */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.card-header {
  padding: 1rem 1.25rem .75rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: .75rem;
}
.card-body { padding: 1.25rem; }
.card-footer {
  padding: .75rem 1.25rem;
  border-top: 1px solid var(--border);
}

/* ── Stat cards ─────────────────────────────────────────────── */
.stats-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 1rem;
  margin-bottom: 1.75rem;
}
.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.1rem 1.25rem;
  display: flex;
  flex-direction: column;
  gap: .25rem;
}
.stat-card__value {
  font-size: 2rem;
  font-weight: 700;
  line-height: 1;
}
.stat-card__label {
  font-size: .8rem;
  color: var(--text-muted);
}
.stat-card--danger  .stat-card__value { color: var(--danger); }
.stat-card--warning .stat-card__value { color: var(--warning); }
.stat-card--success .stat-card__value { color: var(--success); }
.stat-card--accent  .stat-card__value { color: var(--accent); }

/* ── Dashboard layout ───────────────────────────────────────── */
.dashboard-grid {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 1.25rem;
  align-items: start;
}

/* ── Course grid ────────────────────────────────────────────── */
.course-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 1rem;
}
/* ── Course icon badge ───────────────────────────────────────── */
.course-icon-badge {
  width: 48px;
  height: 48px;
  border-radius: 6px;
  background: color-mix(in srgb, var(--course-color, var(--accent)) 18%, transparent);
  border: 1.5px solid color-mix(in srgb, var(--course-color, var(--accent)) 40%, transparent);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--course-color, var(--accent));
  flex-shrink: 0;
}
.course-icon-badge svg { width: 24px; height: 24px; stroke-width: 1.75; }
.course-icon-badge--lg { width: 68px; height: 68px; border-radius: 8px; }
.course-icon-badge--lg svg { width: 34px; height: 34px; }

/* ── Icon picker (course modal) ──────────────────────────────── */
.icon-picker {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(36px, 1fr));
  gap: .35rem;
  max-height: 150px;
  overflow-y: auto;
  padding: .3rem;
  background: rgba(255,255,255,0.02);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}
.icon-pick-btn {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  border: 1.5px solid transparent;
  background: transparent;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition);
}
.icon-pick-btn svg { width: 18px; height: 18px; stroke-width: 1.75; }
.icon-pick-btn:hover { background: rgba(255,255,255,0.06); color: var(--text); border-color: var(--border); }
.icon-pick-btn.selected { background: color-mix(in srgb, var(--accent) 18%, transparent); border-color: var(--accent); color: var(--accent); }

.course-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  display: flex;
  flex-direction: column;
  transition: background var(--transition), transform var(--transition);
  text-decoration: none;
  color: inherit;
  overflow: hidden;
}
.course-card:hover {
  background: var(--bg-card-hover);
  transform: translateY(-1px);
  color: inherit;
}
.course-card__body { padding: 1rem; flex: 1; }
.course-card__top  { display: flex; align-items: flex-start; gap: .75rem; margin-bottom: .75rem; }
.course-card__info { flex: 1; min-width: 0; }
.course-card__name {
  font-weight: 600;
  font-size: .95rem;
  margin-bottom: .2rem;
  color: var(--text);
}
.course-card__code {
  font-size: .78rem;
  color: var(--text-muted);
}
.course-card__footer {
  padding: .6rem 1rem;
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: .5rem;
}
.course-card__meta {
  font-size: .78rem;
  color: var(--text-muted);
}

/* ── Progress bar ───────────────────────────────────────────── */
.progress-bar {
  height: 5px;
  background: rgba(255,255,255,0.08);
  border-radius: 99px;
  overflow: hidden;
  margin-top: .5rem;
}
.progress-bar__fill {
  height: 100%;
  background: var(--success);
  border-radius: var(--radius-pill);
  transition: width .4s ease;
}
.progress-label {
  font-size: .75rem;
  color: var(--text-muted);
  display: flex;
  justify-content: space-between;
  margin-top: .3rem;
}

/* ── Status pills ───────────────────────────────────────────── */
.status-pill {
  display: inline-flex;
  align-items: center;
  gap: .3rem;
  padding: .2rem .55rem;
  border-radius: var(--radius-pill);
  font-size: .75rem;
  font-weight: 600;
  cursor: pointer;
  user-select: none;
  white-space: nowrap;
  transition: opacity var(--transition);
}
.status-pill:hover { opacity: .8; }
.status-pill--not_started {
  background: var(--overlay-md);
  color: var(--text-dim);
  border: 1px solid rgba(255,255,255,0.08);
}
.status-pill--in_progress {
  background: var(--warning-dim);
  color: var(--warning);
  border: 1px solid rgba(245,158,11,0.25);
}
.status-pill--done {
  background: var(--success-dim);
  color: var(--success);
  border: 1px solid rgba(34,197,94,0.25);
}
.status-pill--pending {
  background: var(--overlay-md);
  color: var(--text-muted);
  border: 1px solid rgba(255,255,255,0.1);
}
.status-pill--submitted {
  background: var(--warning-dim);
  color: var(--warning);
  border: 1px solid rgba(245,158,11,0.25);
}
.status-pill--graded {
  background: var(--success-dim);
  color: var(--success);
  border: 1px solid rgba(34,197,94,0.25);
}

/* ── Topic list ─────────────────────────────────────────────── */
.topic-list { display: flex; flex-direction: column; }
.topic-item {
  display: flex;
  align-items: center;
  gap: .6rem;
  padding: .5rem .5rem;
  border-bottom: 1px solid var(--border);
  transition: background var(--transition);
}
.topic-item:last-child { border-bottom: none; }
.topic-item:hover { background: var(--overlay-sm); }
.topic-item__status { flex-shrink: 0; }
.topic-item__type {
  flex-shrink: 0;
  color: var(--course-color, var(--accent));
  width: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.topic-item__type svg { width: 16px; height: 16px; stroke-width: 1.75; }
.topic-item__title {
  flex: 1;
  font-size: .9rem;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.topic-item__title.editable {
  cursor: text;
  border-radius: 3px;
  padding: .1rem .3rem;
}
.topic-item__title.editable:hover { background: var(--overlay-md); }
.topic-item__actions {
  display: flex;
  align-items: center;
  gap: .2rem;
}
.companion-link {
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 4px;
  color: var(--text-dim);
  text-decoration: none;
}
.companion-link svg { width: 14px; height: 14px; }
.companion-link:hover { color: var(--accent); background: var(--accent-dim); }
.goal-btn {
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 4px;
  color: var(--text-dim);
  font-size: .85rem;
  transition: color var(--transition), background var(--transition);
}
.goal-btn:hover { color: var(--warning); }
.goal-btn.active { color: var(--warning); }
.delete-btn {
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 4px;
  color: var(--text-dim);
  font-size: .85rem;
}
.delete-btn:hover { color: var(--danger); background: var(--danger-dim); }
.drag-handle {
  width: 16px;
  display: flex;
  align-items: center;
  color: var(--text-dim);
  cursor: grab;
  font-size: .75rem;
}
.topic-item.dragging { opacity: .4; }

/* ── Inline add form ────────────────────────────────────────── */
.inline-add {
  display: flex;
  align-items: center;
  gap: .5rem;
  padding: .5rem .75rem;
  border-radius: var(--radius-sm);
}
.inline-add__input {
  flex: 1;
  min-width: 0;
  background: transparent;
  border: none;
  border-bottom: 1px solid var(--border-strong);
  border-radius: 0;
  color: var(--text);
  padding: .3rem .1rem;
  font-size: .9rem;
}
.inline-add__input:focus { outline: none; border-color: var(--accent); }
.inline-add__input::placeholder { color: var(--text-dim); }
.inline-add__select {
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  padding: .25rem .4rem;
  font-size: .78rem;
}
.inline-add__select option { background: var(--bg-card-hover); }

/* ── Assignments table ──────────────────────────────────────── */
.ea-list { display: flex; flex-direction: column; }
.ea-item {
  display: flex;
  align-items: center;
  gap: .75rem;
  padding: .5rem .5rem;
  border-bottom: 1px solid var(--border);
  transition: background var(--transition);
}
.ea-item:last-child { border-bottom: none; }
.ea-item:hover { background: var(--overlay-sm); }
.ea-item__icon { flex-shrink: 0; width: 20px; display: flex; align-items: center; justify-content: center; color: var(--course-color, var(--accent)); }
.ea-item__icon svg { width: 16px; height: 16px; stroke-width: 1.75; }
.ea-item__title { flex: 1; font-size: .9rem; min-width: 0; }
.ea-item__due {
  font-size: .8rem;
  white-space: nowrap;
}
.ea-item__due--overdue { color: var(--danger); }
.ea-item__due--urgent  { color: var(--warning); }
.ea-item__due--soon    { color: #fde68a; }
.ea-item__due--ok      { color: var(--text-muted); }
.ea-item__grade {
  font-size: .8rem;
  color: var(--text-muted);
  min-width: 40px;
  text-align: center;
}
.ea-item__actions { display: flex; gap: .2rem; }

/* ── Veranstaltungen ─────────────────────────────────────────── */
.v-add-form { display: flex; flex-direction: column; gap: .4rem; }
.v-add-form__row { display: flex; align-items: center; gap: .5rem; flex-wrap: wrap; }
.v-inline-group { display: inline-flex; align-items: center; gap: .4rem; flex-wrap: wrap; }

/* Secondary row: date/time/pattern controls – underlined, smaller */
.v-add-form__row--secondary { gap: .4rem; }
.v-add-form__row--secondary .form-input,
.v-add-form__row--secondary .form-select {
  background: transparent;
  border: none;
  border-bottom: 1px solid var(--border-strong);
  border-radius: 0;
  font-size: .82rem;
  padding: .2rem .15rem;
  height: auto;
  color: var(--text);
}
.v-add-form__row--secondary .form-textarea {
  font-size: .82rem;
  padding: .2rem .3rem;
  border-radius: var(--radius-sm);
}
.v-add-form__row--secondary .btn {
  padding: .22rem .65rem;
  font-size: .82rem;
  line-height: 1.5;
}

.v-list { display: flex; flex-direction: column; }
.v-item {
  display: flex;
  align-items: center;
  gap: .6rem;
  padding: .5rem .5rem;
  border-bottom: 1px solid var(--border);
  transition: background var(--transition);
}
.v-item:last-child { border-bottom: none; }
.v-item:hover { background: var(--overlay-sm); }
.v-item--past { opacity: .55; }

.v-item__type-icon { flex-shrink: 0; width: 20px; display: flex; align-items: center; justify-content: center; color: var(--course-color, var(--accent)); }
.v-item__type-icon svg { width: 16px; height: 16px; stroke-width: 1.75; }

.v-item__date  { font-size: .88rem; font-weight: 500; white-space: nowrap; min-width: 90px; }
.v-item__time  { font-size: .8rem; white-space: nowrap; }
.v-item__title-loc { flex: 1; min-width: 0; display: flex; align-items: baseline; gap: .25rem; flex-wrap: wrap; }
.v-item__title { font-size: .88rem; }
.v-item__location { font-size: .8rem; }

/* Required flag button */
.v-item__req-btn { color: var(--text-dim); padding: .2rem; transition: color var(--transition); }
.v-item__req-btn svg { width: 14px; height: 14px; }
.v-item__req-btn.active { color: var(--warning); }
.v-item__req-btn:hover { color: var(--warning); }

/* Attendance status pill variants */
.status-pill--att-none     { background: var(--overlay-md); color: var(--text-dim); border: 1px solid rgba(255,255,255,0.08); }
.status-pill--att-attended { background: var(--success-dim); color: var(--success); border: 1px solid rgba(34,197,94,0.25); }
.status-pill--att-watched  { background: rgba(99,102,241,0.12); color: var(--accent); border: 1px solid rgba(99,102,241,0.25); }
.status-pill--att-missed   { background: rgba(239,68,68,0.12); color: var(--danger); border: 1px solid rgba(239,68,68,0.25); }

/* Dashboard card upcoming rows */
.course-card__upcoming { display: flex; flex-direction: column; gap: .2rem; flex: 1; }
.course-card__upcoming-row {
  display: flex;
  align-items: center;
  gap: .4rem;
  font-size: .78rem;
  color: var(--text-muted);
}
.course-card__upcoming-row svg { width: 13px; height: 13px; flex-shrink: 0; }

/* ── Deadline list ──────────────────────────────────────────── */
.deadline-list { display: flex; flex-direction: column; width: 100%; }
.deadline-item {
  width: 100%;
  display: flex;
  align-items: center;
  gap: .75rem;
  padding: .5rem .5rem;
  border-bottom: 1px solid var(--border);
  transition: background var(--transition);
}
.deadline-item:last-child { border-bottom: none; }
.deadline-item:hover { background: var(--overlay-sm); }
.deadline-item.done { opacity: .5; }
.deadline-item.done .deadline-item__title { text-decoration: line-through; }
.deadline-type-icon {
  flex-shrink: 0;
  width: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--course-color, var(--accent));
}
.deadline-type-icon svg { width: 16px; height: 16px; stroke-width: 1.75; }
.deadline-item__title { flex: 1; font-size: .9rem; min-width: 0; }
.deadline-item__date  { font-size: .8rem; white-space: nowrap; }

/* Dashboard deadline variant — title+meta stacked */
.deadline-item--dashboard .deadline-item__body  { flex: 1; min-width: 0; }
.deadline-item--dashboard .deadline-item__title { font-size: 1rem; font-weight: 600; }
.deadline-item--dashboard .deadline-item__meta  { font-size: .75rem; color: var(--text-muted); margin-top: .1rem; }
.deadline-item__course-link { color: var(--text-muted); text-decoration: none; }
.deadline-item__course-link:hover { color: var(--text); }
.btn-group { display: flex; gap: .25rem; }

/* ── Section header ─────────────────────────────────────────── */
.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}
.section-title {
  font-size: .85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .07em;
  color: var(--text-muted);
}

/* ── Page header ────────────────────────────────────────────── */
.page-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.75rem;
  flex-wrap: wrap;
}
.page-header__title { font-size: 1.4rem; font-weight: 700; }
.page-header__sub   { font-size: .875rem; color: var(--text-muted); margin-top: .2rem; }
.page-header__actions { display: flex; gap: .5rem; flex-wrap: wrap; align-items: center; }

/* ── Course header ──────────────────────────────────────────── */
.course-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.5rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--border);
}
.course-header__top  { display: flex; align-items: flex-start; gap: .875rem; flex: 1; }
.course-header__color-bar {
  width: 4px;
  min-height: 50px;
  border-radius: var(--radius-pill);
  background: var(--course-color, var(--accent));
  flex-shrink: 0;
  align-self: stretch;
}
.course-header__info { flex: 1; }
.course-header__name { font-size: 1.3rem; font-weight: 700; }
.course-header__meta { font-size: .85rem; color: var(--text-muted); margin-top: .2rem; }
.course-header__actions { display: flex; gap: .5rem; align-items: flex-start; flex-wrap: wrap; }

/* ── Requirements chips ─────────────────────────────────────── */
.req-chips { display: flex; flex-wrap: wrap; gap: .5rem; margin-top: .75rem; }
.req-chip svg { width: 12px; height: 12px; flex-shrink: 0; }
.req-chip {
  display: inline-flex;
  align-items: center;
  gap: .35rem;
  padding: .25rem .6rem;
  border-radius: var(--radius-pill);
  font-size: .78rem;
  font-weight: 500;
  border: 1px solid var(--border-strong);
  background: var(--overlay-sm);
  color: var(--text-muted);
}
.req-chip--ok      { border-color: rgba(34,197,94,0.3);  background: var(--success-dim); color: var(--success); }
.req-chip--warn    { border-color: rgba(245,158,11,0.3); background: var(--warning-dim); color: var(--warning); }
.req-chip--danger  { border-color: rgba(239,68,68,0.3);  background: var(--danger-dim);  color: var(--danger); }

/* Custom requirements tooltip chip */
.req-chip--has-tooltip { position: relative; }
.req-chip__trigger {
  background: none;
  border: none;
  padding: 0;
  color: inherit;
  font: inherit;
  cursor: pointer;
  line-height: 1;
}
.req-chip__tooltip {
  display: none;
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  z-index: 100;
  min-width: 220px;
  max-width: 320px;
  background: var(--bg-base);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  padding: .6rem .75rem;
  font-size: .78rem;
  font-weight: 400;
  color: var(--text-muted);
  line-height: 1.5;
  white-space: normal;
  box-shadow: var(--shadow);
}
.req-chip__tooltip::before {
  content: '';
  position: absolute;
  top: -5px;
  left: 12px;
  width: 8px;
  height: 8px;
  background: var(--bg-base);
  border-left: 1px solid var(--border-strong);
  border-top: 1px solid var(--border-strong);
  transform: rotate(45deg);
}
.req-chip--has-tooltip.open .req-chip__tooltip { display: block; }

/* ── Tabs ───────────────────────────────────────────────────── */
.tabs {
  display: flex;
  gap: .25rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 1.25rem;
  overflow-x: auto;
  padding-bottom: 2px;
}
.tab-btn {
  padding: .5rem 1rem;
  font-size: .875rem;
  font-weight: 500;
  color: var(--text-muted);
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  white-space: nowrap;
  transition: color var(--transition), border-color var(--transition);
}
.tab-btn:hover { color: var(--text); }
.tab-btn.active { color: var(--course-color, var(--accent)); border-color: var(--course-color, var(--accent)); }
.tab-panel { display: none; }
.tab-panel.active { display: block; overflow-x: hidden; }

/* ── Modal ──────────────────────────────────────────────────── */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.65);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 200;
  padding: 1rem;
}
.modal-overlay[hidden] { display: none; }
.modal {
  background: var(--bg-card);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 520px;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow);
}
.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 1.5rem 1rem;
  border-bottom: 1px solid var(--border);
}
.modal-title { font-size: 1rem; font-weight: 600; }
.modal-close {
  font-size: 1.3rem;
  color: var(--text-muted);
  line-height: 1;
}
.modal-close:hover { color: var(--text); }
.modal-body { padding: 1.25rem 1.5rem; display: flex; flex-direction: column; gap: .75rem; }

.modal-form { display: flex; flex-direction: column; gap: 0; }
.modal-form > .form-group,
.modal-form > .form-row { margin-bottom: 1.25rem; }
.modal-form > .req-section-title { margin-bottom: .5rem; }
.modal-form > .req-block { margin-bottom: .5rem; }
.modal-form > .req-block:last-of-type { margin-bottom: 1.25rem; }
.modal-footer {
  padding: .875rem 1.5rem 1.25rem;
  display: flex;
  justify-content: flex-end;
  gap: .5rem;
}

/* ── Toast ──────────────────────────────────────────────────── */
.toast-container {
  position: fixed;
  bottom: 1.25rem;
  right: 1.25rem;
  z-index: 300;
  display: flex;
  flex-direction: column;
  gap: .5rem;
}
.toast {
  background: var(--bg-card-hover);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  padding: .65rem 1rem;
  font-size: .875rem;
  box-shadow: var(--shadow);
  min-width: 200px;
  max-width: 340px;
  animation: slideIn .2s ease;
}
.toast--success { border-color: rgba(34,197,94,0.4);  color: #86efac; }
.toast--error   { border-color: rgba(239,68,68,0.4);  color: #fca5a5; }
@keyframes slideIn {
  from { opacity: 0; transform: translateX(20px); }
  to   { opacity: 1; transform: translateX(0); }
}

/* ── Requirements section (course modal) ───────────────────── */
.req-section-title {
  font-size: .78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--text-muted);
  margin: 0 0 .5rem;
}
.req-block {
  display: flex;
  flex-direction: column;
  gap: .4rem;
  padding: .6rem .75rem;
  background: rgba(255,255,255,0.02);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}
.req-block + .req-block { margin-top: .5rem; }
.req-indent {
  padding-left: 1.5rem;
  border-left: 2px solid var(--border-strong);
  margin-top: .25rem;
}

/* ── Color picker ───────────────────────────────────────────── */
.color-picker { display: flex; gap: .5rem; flex-wrap: wrap; }
.color-swatch {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 2px solid transparent;
  cursor: pointer;
  transition: transform var(--transition), border-color var(--transition);
}
.color-swatch:hover { transform: scale(1.15); }
.color-swatch.selected { border-color: #fff; }

/* ── Empty state ────────────────────────────────────────────── */
.empty-state {
  text-align: center;
  padding: 2.5rem 1rem;
  color: var(--text-dim);
}
.empty-state__icon { font-size: 2rem; margin-bottom: .75rem; }
.empty-state__text { font-size: .9rem; }

/* ── Separator ──────────────────────────────────────────────── */
.divider {
  height: 1px;
  background: var(--border);
  margin: 1.25rem 0;
}

/* ── Semester management ────────────────────────────────────── */
.semester-list { display: flex; flex-direction: column; gap: .75rem; }
.semester-item {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: .875rem 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.semester-item__name { flex: 1; font-weight: 600; }
.semester-item__year { font-size: .85rem; color: var(--text-muted); }
.active-badge {
  background: var(--success-dim);
  color: var(--success);
  border: 1px solid rgba(34,197,94,0.3);
  font-size: .72rem;
  font-weight: 700;
  padding: .15rem .45rem;
  border-radius: var(--radius-pill);
  text-transform: uppercase;
  letter-spacing: .05em;
}

/* ── Responsive ─────────────────────────────────────────────── */
@media (max-width: 768px) {
  .header-nav {
    display: none;
    position: fixed;
    top: var(--header-h);
    left: 0; right: 0;
    background: var(--bg-header);
    border-bottom: 1px solid var(--border);
    padding: .75rem 1rem;
    flex-direction: column;
    gap: .25rem;
    z-index: 99;
  }
  .header-nav.open { display: flex; }
  .hamburger { display: flex; }

  .dashboard-grid { grid-template-columns: 1fr; }
  .form-row { flex-direction: column; gap: .75rem; }
  .course-grid { grid-template-columns: 1fr; }
  .stats-row { grid-template-columns: repeat(2, 1fr); }

  .site-main { padding: 1rem .875rem 4rem; }

  .course-header { flex-wrap: wrap; }
  .course-header__actions { width: 100%; }

  .page-header { flex-direction: column; }

  .ea-item__grade { display: none; }
}

@media (max-width: 480px) {
  .stats-row { grid-template-columns: 1fr 1fr; }
  .auth-card { padding: 1.75rem 1.25rem; }
}

/* ── Misc utilities ─────────────────────────────────────────── */
.mt-1  { margin-top: .5rem; }
.mt-2  { margin-top: 1rem; }
.mt-3  { margin-top: 1.5rem; }
.mb-1  { margin-bottom: .5rem; }
.mb-2  { margin-bottom: 1rem; }
.mb-3  { margin-bottom: 1.5rem; }
.text-muted { color: var(--text-muted); }
.text-sm    { font-size: .85rem; }
.flex-center { display: flex; align-items: center; }
.gap-sm { gap: .5rem; }
.hidden { display: none !important; }
.w-full { width: 100%; }