/* =============================================
   Exam Countdown & Study Planner
   ============================================= */

.planner-section {
  padding: 60px 0 80px;
  background: var(--gray-50);
  border-top: 1px solid var(--gray-100);
  border-bottom: 1px solid var(--gray-100);
}

[data-theme="dark"] .planner-section {
  background: rgba(255,255,255,0.02);
  border-color: rgba(255,255,255,0.06);
}

/* ── COUNTDOWN BAND ── */
.countdown-band {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  background: linear-gradient(135deg, #16a34a 0%, #15803d 60%, #166534 100%);
  border-radius: var(--radius-xl);
  padding: 36px 24px 28px;
  margin-bottom: 40px;
  box-shadow: 0 8px 32px rgba(22,163,74,0.25);
  position: relative;
  overflow: hidden;
}

.countdown-band::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 80% 20%, rgba(255,255,255,0.08) 0%, transparent 60%);
  pointer-events: none;
}

.countdown-label {
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.2px;
  color: rgba(255,255,255,0.75);
}

.countdown-digits {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: center;
}

.cd-block {
  display: flex;
  flex-direction: column;
  align-items: center;
  background: rgba(0,0,0,0.25);
  border-radius: 12px;
  padding: 14px 20px 10px;
  min-width: 80px;
}

.cd-block span:first-child {
  font-size: 2.8rem;
  font-weight: 800;
  color: #fff;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  letter-spacing: -1px;
}

.cd-unit {
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: rgba(255,255,255,0.6);
  margin-top: 4px;
}

.cd-sep {
  font-size: 2rem;
  font-weight: 800;
  color: rgba(255,255,255,0.4);
  margin-top: -12px;
  line-height: 1;
}

.countdown-date {
  font-size: 0.82rem;
  color: rgba(255,255,255,0.65);
  letter-spacing: 0.3px;
}

/* ── PLANNER BODY LAYOUT ── */
.planner-body {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: 28px;
  align-items: start;
}

/* ── SUBJECT SETUP PANEL ── */
.planner-setup {
  background: var(--white);
  border: 1.5px solid var(--gray-100);
  border-radius: var(--radius-xl);
  padding: 24px;
  position: sticky;
  top: 88px;
}

[data-theme="dark"] .planner-setup {
  background: rgba(255,255,255,0.04);
  border-color: rgba(255,255,255,0.08);
}

.planner-setup-title {
  font-size: 1rem;
  font-weight: 800;
  color: var(--gray-900);
  margin-bottom: 6px;
}

[data-theme="dark"] .planner-setup-title { color: #f1f5f9; }

.planner-setup-sub {
  font-size: 0.8rem;
  color: var(--gray-500);
  line-height: 1.5;
  margin-bottom: 16px;
}

/* Subject checklist */
.subject-checklist {
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin-bottom: 18px;
}

.sc-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 7px 10px;
  border-radius: var(--radius-md);
  transition: background var(--transition);
  border: 1.5px solid transparent;
}

.sc-row--checked {
  background: var(--green-50);
  border-color: rgba(22,163,74,0.15);
}

[data-theme="dark"] .sc-row--checked {
  background: rgba(22,163,74,0.1);
  border-color: rgba(22,163,74,0.2);
}

.sc-label {
  display: flex;
  align-items: center;
  gap: 9px;
  cursor: pointer;
  flex: 1;
  min-width: 0;
}

.sc-checkbox {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.sc-check-custom {
  width: 18px;
  height: 18px;
  border: 2px solid var(--gray-300);
  border-radius: 5px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
  background: var(--white);
}

[data-theme="dark"] .sc-check-custom {
  border-color: rgba(255,255,255,0.2);
  background: rgba(255,255,255,0.06);
}

.sc-checkbox:checked + .sc-check-custom {
  background: var(--green-600);
  border-color: var(--green-600);
}

.sc-checkbox:checked + .sc-check-custom::after {
  content: '';
  display: block;
  width: 5px;
  height: 9px;
  border: 2px solid white;
  border-top: none;
  border-left: none;
  transform: rotate(45deg) translateY(-1px);
}

.sc-emoji { font-size: 1rem; }

.sc-name {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--gray-700);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

[data-theme="dark"] .sc-name { color: #cbd5e1; }

.sc-row--checked .sc-name {
  color: var(--green-800);
  font-weight: 600;
}

[data-theme="dark"] .sc-row--checked .sc-name { color: #4ade80; }

.sc-weak-btn {
  background: none;
  border: 1.5px solid var(--gray-200);
  border-radius: 6px;
  color: var(--gray-400);
  font-size: 0.85rem;
  padding: 3px 7px;
  cursor: pointer;
  transition: all var(--transition);
  flex-shrink: 0;
  line-height: 1;
}

.sc-weak-btn:hover:not([disabled]) {
  border-color: #f59e0b;
  color: #f59e0b;
}

.sc-weak-btn.active {
  background: #fef3c7;
  border-color: #f59e0b;
  color: #92400e;
}

[data-theme="dark"] .sc-weak-btn.active {
  background: rgba(245,158,11,0.15);
  border-color: #f59e0b;
  color: #fbbf24;
}

.sc-weak-btn[disabled] {
  opacity: 0.3;
  cursor: not-allowed;
}

.planner-legend {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.75rem;
  color: var(--gray-500);
  margin-bottom: 16px;
}

.planner-legend span { color: #f59e0b; }

.planner-gen-btn {
  width: 100%;
  justify-content: center;
}

/* ── TIMETABLE PANEL ── */
.planner-timetable {
  display: flex;
  flex-direction: column;
  gap: 20px;
  min-height: 300px;
}

.planner-empty {
  background: var(--white);
  border: 1.5px solid var(--gray-100);
  border-radius: var(--radius-xl);
  padding: 64px 32px;
  text-align: center;
  color: var(--gray-400);
  font-size: 0.92rem;
  line-height: 1.6;
}

[data-theme="dark"] .planner-empty {
  background: rgba(255,255,255,0.03);
  border-color: rgba(255,255,255,0.07);
}

.planner-empty-icon {
  font-size: 2.5rem;
  margin-bottom: 14px;
}

.planner-empty strong { color: var(--green-600); }

/* Timetable header */
.tt-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 4px;
}

.tt-header-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--gray-900);
}

[data-theme="dark"] .tt-header-title { color: #f1f5f9; }

.tt-regen-btn {
  font-size: 0.8rem;
  padding: 6px 14px;
}

/* Week block */
.tt-week {
  background: var(--white);
  border: 1.5px solid var(--gray-100);
  border-radius: var(--radius-xl);
  overflow: hidden;
}

[data-theme="dark"] .tt-week {
  background: rgba(255,255,255,0.04);
  border-color: rgba(255,255,255,0.08);
}

.tt-week-label {
  padding: 10px 16px;
  font-size: 0.75rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  color: var(--gray-500);
  border-bottom: 1px solid var(--gray-100);
  background: var(--gray-50);
}

[data-theme="dark"] .tt-week-label {
  background: rgba(255,255,255,0.02);
  border-bottom-color: rgba(255,255,255,0.06);
}

.tt-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  overflow-x: auto;
}

/* Day cell */
.tt-day {
  border-right: 1px solid var(--gray-100);
  min-width: 100px;
  min-height: 90px;
}

.tt-day:last-child { border-right: none; }

[data-theme="dark"] .tt-day {
  border-right-color: rgba(255,255,255,0.06);
}

.tt-weekend {
  background: rgba(0,0,0,0.015);
}

[data-theme="dark"] .tt-weekend {
  background: rgba(255,255,255,0.01);
}

.tt-past {
  opacity: 0.45;
}

.tt-today .tt-day-header {
  background: var(--green-600);
}

.tt-today .tt-day-name,
.tt-today .tt-day-date {
  color: white !important;
}

.tt-day-header {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 8px 6px 6px;
  border-bottom: 1px solid var(--gray-100);
  gap: 1px;
}

[data-theme="dark"] .tt-day-header {
  border-bottom-color: rgba(255,255,255,0.06);
}

.tt-day-name {
  font-size: 0.7rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--gray-500);
}

.tt-day-date {
  font-size: 0.68rem;
  color: var(--gray-400);
}

.tt-sessions {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 6px;
}

.tt-session {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 0.72rem;
  font-weight: 600;
  padding: 4px 7px;
  border-radius: 6px;
  background: color-mix(in srgb, var(--s-color) 12%, transparent);
  color: var(--s-color);
  border: 1px solid color-mix(in srgb, var(--s-color) 25%, transparent);
  line-height: 1.2;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Fallback for browsers without color-mix */
@supports not (background: color-mix(in srgb, red 10%, transparent)) {
  .tt-session {
    background: rgba(99,102,241,0.1);
    color: #4f46e5;
    border-color: rgba(99,102,241,0.2);
  }
}

.tt-session-exam {
  --s-color: #ef4444;
  font-style: italic;
  opacity: 0.7;
}

[data-theme="dark"] .tt-session {
  filter: brightness(1.1);
}

/* ── RESPONSIVE ── */
@media (max-width: 900px) {
  .planner-body {
    grid-template-columns: 1fr;
  }
  .planner-setup {
    position: static;
  }
  .subject-checklist {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4px;
  }
}

@media (max-width: 600px) {
  .cd-block {
    min-width: 64px;
    padding: 10px 14px 8px;
  }
  .cd-block span:first-child {
    font-size: 2rem;
  }
  .cd-sep {
    font-size: 1.4rem;
    margin-top: -8px;
  }
  .subject-checklist {
    grid-template-columns: 1fr;
  }
  .tt-grid {
    grid-template-columns: repeat(7, minmax(90px, 1fr));
  }
}