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

:root {
  --black:   #0a0a0a;
  --dark:    #141414;
  --card:    #1c1c1c;
  --border:  #2a2a2a;
  --accent:  #c8a96e;
  --accent2: #e8c98e;
  --white:   #f5f5f5;
  --gray:    #888;
  --light:   #ccc;
  --danger:  #ef4444;
  --success: #22c55e;
  --radius:  10px;
}

body {
  font-family: 'Helvetica Neue', Arial, sans-serif;
  background: var(--black);
  color: var(--white);
  min-height: 100vh;
  line-height: 1.6;
}

.screen { min-height: 100vh; }
.hidden { display: none !important; }

/* ── Auth ── */
#auth-screen {
  display: flex; align-items: center; justify-content: center;
  background: radial-gradient(ellipse 80% 60% at 50% 30%, rgba(200,169,110,0.08) 0%, transparent 70%),
              var(--black);
  min-height: 100vh;
}
.auth-box {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 2.5rem;
  width: 100%; max-width: 400px;
  box-shadow: 0 30px 60px rgba(0,0,0,0.5);
}
.auth-box h1 {
  text-align: center;
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  color: var(--accent);
  letter-spacing: 0.03em;
}

.tab-bar {
  display: flex;
  border-bottom: 1px solid var(--border);
  margin-bottom: 1.5rem;
}
.tab {
  flex: 1; padding: 0.6rem;
  border: none; background: none;
  cursor: pointer; font-size: 0.95rem;
  color: var(--gray);
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  transition: all .2s;
}
.tab.active { color: var(--accent); border-bottom-color: var(--accent); font-weight: 600; }

.tab-content { display: none; flex-direction: column; gap: 0.8rem; }
.tab-content.active { display: flex; }

input[type="text"], input[type="email"], input[type="password"],
input[type="number"], input[type="date"], input[type="time"],
select, textarea {
  width: 100%;
  padding: 0.65rem 0.9rem;
  background: var(--dark);
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  color: var(--white);
  font-size: 0.95rem;
  outline: none;
  transition: border-color .2s;
}
input::placeholder { color: var(--gray); }
input:focus, select:focus { border-color: var(--accent); }
select option { background: var(--dark); }

.btn-primary {
  width: 100%; padding: 0.75rem;
  background: var(--accent); color: var(--black);
  border: none; border-radius: var(--radius);
  font-size: 1rem; font-weight: 700;
  cursor: pointer; transition: background .2s;
}
.btn-primary:hover { background: var(--accent2); }

.btn-ghost {
  padding: 0.4rem 0.9rem;
  background: none;
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--light);
  cursor: pointer; font-size: 0.9rem;
  transition: all .2s;
}
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }

.btn-icon {
  width: 2rem; height: 2rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--card);
  color: var(--light);
  cursor: pointer; font-size: 1.1rem;
  display: flex; align-items: center; justify-content: center;
  transition: all .2s;
}
.btn-icon:hover { border-color: var(--accent); color: var(--accent); }

.btn-small {
  padding: 0.3rem 0.75rem;
  border-radius: 6px; border: none;
  cursor: pointer; font-size: 0.82rem; font-weight: 600;
}
.btn-success { background: rgba(34,197,94,0.15); color: var(--success); border: 1px solid rgba(34,197,94,0.3); }
.btn-success:hover { background: rgba(34,197,94,0.25); }
.btn-danger  { background: rgba(239,68,68,0.15);  color: var(--danger);  border: 1px solid rgba(239,68,68,0.3);  }
.btn-danger:hover  { background: rgba(239,68,68,0.25);  }
.btn-outline {
  background: transparent;
  border: 1px solid var(--accent);
  color: var(--accent);
}
.btn-outline:hover { background: rgba(200,169,110,0.1); }

.btn-outline-sm {
  padding: 0.35rem 0.8rem;
  border: 1px solid var(--border);
  color: var(--light);
  background: transparent;
  border-radius: 8px; cursor: pointer;
  font-size: 0.88rem; font-weight: 500;
  transition: all .2s; white-space: nowrap;
}
.btn-outline-sm:hover, .btn-outline-sm.active {
  border-color: var(--accent); color: var(--accent);
  background: rgba(200,169,110,0.08);
}

.btn-outline-full {
  width: 100%; padding: 0.65rem;
  border: 1px solid var(--border);
  color: var(--light); background: transparent;
  border-radius: var(--radius); cursor: pointer;
  font-size: 0.95rem; font-weight: 500;
  transition: all .2s;
}
.btn-outline-full:hover { border-color: var(--accent); color: var(--accent); }

.btn-primary-sm {
  padding: 0.5rem 1rem;
  background: var(--accent); color: var(--black);
  border: none; border-radius: 8px;
  cursor: pointer; font-size: 0.9rem; font-weight: 700;
}
.btn-primary-sm:hover { background: var(--accent2); }

.error-msg { color: var(--danger); font-size: 0.85rem; margin-top: 0.4rem; min-height: 1.2em; }

/* ── Navbar ── */
.navbar {
  display: flex; align-items: center; gap: 1rem;
  padding: 0 1.5rem; height: 60px;
  background: rgba(10,10,10,0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 100;
}
.nav-brand {
  font-size: 1.1rem; font-weight: 700;
  color: var(--accent); margin-right: auto;
  text-decoration: none; letter-spacing: 0.05em;
}
.nav-links { display: flex; gap: 0.3rem; }
.nav-link {
  padding: 0.4rem 0.9rem;
  border-radius: 8px; border: none;
  background: none; cursor: pointer;
  font-size: 0.9rem; color: var(--gray);
  font-weight: 500; transition: all .2s;
}
.nav-link:hover, .nav-link.active {
  background: rgba(200,169,110,0.1);
  color: var(--accent);
}
.nav-user { display: flex; align-items: center; gap: 0.6rem; font-size: 0.9rem; }
#nav-username { font-weight: 600; color: var(--light); }

/* ── Pages ── */
.page { padding: 1.5rem 2rem; max-width: 1100px; margin: 0 auto; }
.page-header {
  display: flex; align-items: center;
  justify-content: space-between;
  flex-wrap: wrap; gap: 0.8rem; margin-bottom: 1.5rem;
}
.page-header h2 { font-size: 1.4rem; font-weight: 700; }

/* ── Calendar ── */
.calendar-controls {
  display: flex; align-items: center;
  gap: 0.6rem; font-weight: 600; font-size: 1rem;
  margin-bottom: 1rem; color: var(--light);
}
.calendar-grid {
  display: grid; grid-template-columns: repeat(7, 1fr);
  gap: 1px; background: var(--border);
  border: 1px solid var(--border);
  border-radius: var(--radius); overflow: hidden;
}
.cal-header {
  background: var(--dark);
  color: var(--accent);
  text-align: center; padding: 0.5rem;
  font-weight: 600; font-size: 0.85rem;
}
.cal-day {
  background: var(--card);
  min-height: 90px; padding: 0.4rem;
}
.cal-day.other-month { background: var(--dark); opacity: 0.5; }
.cal-day.today { background: rgba(200,169,110,0.06); }
.cal-date {
  font-size: 0.8rem; font-weight: 600;
  color: var(--gray); margin-bottom: 0.2rem;
}
.cal-day.today .cal-date { color: var(--accent); }

.cal-slot {
  background: rgba(200,169,110,0.2);
  color: var(--accent);
  border: 1px solid rgba(200,169,110,0.3);
  border-radius: 4px; padding: 2px 5px;
  font-size: 0.72rem; margin-bottom: 2px;
  cursor: pointer; white-space: nowrap;
  overflow: hidden; text-overflow: ellipsis;
  transition: background .2s;
}
.cal-slot:hover { background: rgba(200,169,110,0.35); }
.cal-slot.full { background: rgba(136,136,136,0.15); color: var(--gray); border-color: var(--border); }
.cal-slot.teacher-own { background: rgba(200,169,110,0.25); color: var(--accent2); border-color: rgba(200,169,110,0.4); }
.cal-slot.selected { outline: 2px solid var(--accent2); outline-offset: 1px; }
.cal-slot.multiselect-mode { cursor: crosshair; }
.cal-toolbar { display: flex; align-items: center; gap: 0.6rem; flex-wrap: wrap; }

/* ── Card list ── */
.card-list { display: flex; flex-direction: column; gap: 0.8rem; }
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.2rem;
  display: flex; align-items: center;
  gap: 1rem; flex-wrap: wrap;
  transition: border-color .2s;
}
.card:hover { border-color: rgba(200,169,110,0.3); }
.card-info { flex: 1; }
.card-title { font-weight: 700; font-size: 1rem; margin-bottom: 0.2rem; color: var(--white); }
.card-sub { font-size: 0.87rem; color: var(--gray); }
.card-actions { display: flex; gap: 0.5rem; align-items: center; }

.badge {
  display: inline-block; padding: 2px 10px;
  border-radius: 99px; font-size: 0.78rem; font-weight: 600;
}
.badge-booked   { background: rgba(200,169,110,0.15); color: var(--accent); }
.badge-attended { background: rgba(34,197,94,0.12);  color: var(--success); }
.badge-cancelled{ background: rgba(239,68,68,0.12);  color: var(--danger);  }
.credits-badge  { font-size: 1.5rem; font-weight: 800; color: var(--accent); min-width: 60px; text-align: center; }

/* ── Modal ── */
.modal {
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.7);
  display: flex; align-items: center; justify-content: center;
  z-index: 200;
  backdrop-filter: blur(4px);
}
.modal-content {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px; padding: 2rem;
  width: 90%; max-width: 440px;
  position: relative;
  box-shadow: 0 30px 60px rgba(0,0,0,0.5);
}
.modal-wide { max-width: 560px; }
.modal-close {
  position: absolute; top: 0.8rem; right: 0.8rem;
  background: none; border: none;
  font-size: 1.1rem; cursor: pointer;
  color: var(--gray); transition: color .2s;
}
.modal-close:hover { color: var(--white); }
.modal-content h3 { margin-bottom: 1rem; font-size: 1.1rem; color: var(--white); }
.modal-content form { display: flex; flex-direction: column; gap: 0.7rem; }
.modal-content label { display: flex; flex-direction: column; gap: 0.3rem; font-size: 0.9rem; font-weight: 500; color: var(--light); }
.modal-hint { font-size: 0.85rem; color: var(--gray); margin-bottom: 1rem; }

/* ── Form ── */
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 0.7rem; }
.days-selector {
  display: flex; align-items: center;
  flex-wrap: wrap; gap: 0.5rem; padding: 0.5rem 0;
}
.days-selector span { font-size: 0.9rem; font-weight: 500; color: var(--gray); }
.days-selector label {
  display: flex; align-items: center; gap: 0.25rem;
  cursor: pointer; font-size: 0.9rem;
  padding: 0.25rem 0.5rem;
  border: 1px solid var(--border);
  border-radius: 6px; color: var(--light);
  transition: all .15s;
}
.days-selector label:has(input:checked) {
  border-color: var(--accent);
  background: rgba(200,169,110,0.1);
  color: var(--accent); font-weight: 600;
}
.days-selector input[type="checkbox"] { accent-color: var(--accent); }

/* ── Batch preview ── */
.batch-preview {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  max-height: 200px; overflow-y: auto;
  margin: 0.5rem 0;
  background: var(--dark);
}
.batch-preview-header {
  padding: 0.5rem 0.8rem;
  background: var(--card);
  border-bottom: 1px solid var(--border);
  font-size: 0.85rem; font-weight: 600;
  color: var(--gray);
  display: flex; justify-content: space-between;
  position: sticky; top: 0;
}
.batch-preview-item {
  padding: 0.4rem 0.8rem;
  font-size: 0.85rem;
  border-bottom: 1px solid var(--border);
  display: flex; align-items: center; gap: 0.5rem;
  color: var(--light);
}
.batch-preview-item:last-child { border-bottom: none; }
.batch-preview-item.booked { color: var(--gray); text-decoration: line-through; }
.preview-badge {
  font-size: 0.72rem; padding: 1px 6px;
  border-radius: 4px;
  background: rgba(200,169,110,0.15);
  color: var(--accent);
}

/* ── Batch bar ── */
.batch-bar {
  position: fixed; bottom: 1.5rem;
  left: 50%; transform: translateX(-50%);
  background: var(--card);
  border: 1px solid var(--accent);
  color: var(--white);
  padding: 0.7rem 1.4rem;
  border-radius: 99px;
  display: flex; align-items: center; gap: 1rem;
  z-index: 300;
  box-shadow: 0 8px 30px rgba(0,0,0,0.4);
}
#batch-bar-count { font-weight: 600; font-size: 0.95rem; color: var(--accent); }

/* ── Empty state ── */
.empty-state {
  text-align: center; padding: 3rem;
  color: var(--gray); font-size: 0.95rem;
}

/* ── Toast ── */
.toast {
  position: fixed; bottom: 2rem;
  left: 50%; transform: translateX(-50%) translateY(20px);
  background: var(--card);
  border: 1px solid var(--accent);
  color: var(--white);
  padding: 0.7rem 1.4rem;
  border-radius: 99px; font-size: 0.9rem;
  opacity: 0; transition: all .3s;
  z-index: 999; pointer-events: none;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
.toast.toast-error   { border-color: var(--danger); background: rgba(239,68,68,0.15); }
.toast.toast-success { border-color: var(--success); background: rgba(34,197,94,0.12); }

/* ── Info Pages ── */
.info-grid {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 1.2rem;
}
.info-card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: 12px; padding: 1.8rem;
  transition: border-color .2s, transform .2s;
}
.info-card:hover { border-color: var(--accent); transform: translateY(-3px); }
.info-icon {
  font-size: 1.8rem; margin-bottom: 1rem;
  width: 48px; height: 48px;
  background: rgba(200,169,110,0.1);
  border: 1px solid rgba(200,169,110,0.2);
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
}
.info-card h3 { font-size: 1rem; font-weight: 700; margin-bottom: 0.5rem; }
.info-card p  { font-size: 0.88rem; color: var(--gray); line-height: 1.6; }

.instructor-grid {
  display: grid; grid-template-columns: repeat(2, 1fr);
  gap: 1.2rem;
}
.instructor-card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: 12px; overflow: hidden;
  display: flex; gap: 0;
  transition: border-color .2s, transform .2s;
}
.instructor-card:hover { border-color: var(--accent); transform: translateY(-3px); }
.instructor-photo {
  width: 90px; flex-shrink: 0;
  background: linear-gradient(135deg, var(--border), var(--dark));
  display: flex; align-items: center; justify-content: center;
  font-size: 2.5rem;
}
.instructor-body { padding: 1.2rem; flex: 1; }
.instructor-body h3 { font-size: 1rem; font-weight: 700; margin-bottom: 0.2rem; }
.instructor-title { color: var(--accent); font-size: 0.78rem; font-weight: 600; margin-bottom: 0.5rem; }
.instructor-body p  { font-size: 0.83rem; color: var(--gray); line-height: 1.5; margin-bottom: 0.7rem; }
.instructor-tags { display: flex; flex-wrap: wrap; gap: 0.35rem; }
.itag {
  font-size: 0.7rem; padding: 0.2rem 0.55rem;
  background: rgba(200,169,110,0.1);
  border: 1px solid rgba(200,169,110,0.25);
  border-radius: 100px; color: var(--accent);
}

.plans-grid {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 1.2rem;
}
.plan-card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: 14px; padding: 1.8rem;
  position: relative; transition: transform .2s;
}
.plan-card:hover { transform: translateY(-4px); }
.plan-card.featured {
  border-color: var(--accent);
  background: linear-gradient(160deg, rgba(200,169,110,0.06), var(--card));
}
.plan-badge {
  position: absolute; top: -12px; left: 50%; transform: translateX(-50%);
  background: var(--accent); color: var(--black);
  font-size: 0.7rem; font-weight: 700;
  padding: 0.25rem 0.9rem; border-radius: 100px; white-space: nowrap;
}
.plan-name  { font-size: 0.85rem; color: var(--gray); font-weight: 600; margin-bottom: 0.6rem; }
.plan-price { font-size: 2rem; font-weight: 800; margin-bottom: 0.3rem; }
.plan-price span { font-size: 0.9rem; font-weight: 400; color: var(--gray); }
.plan-desc  { color: var(--gray); font-size: 0.83rem; margin-bottom: 1.2rem; padding-bottom: 1.2rem; border-bottom: 1px solid var(--border); }
.plan-features { list-style: none; display: flex; flex-direction: column; gap: 0.6rem; }
.plan-features li { font-size: 0.85rem; color: var(--light); display: flex; gap: 0.5rem; }
.plan-features li::before { content: '✓'; color: var(--accent); font-weight: 700; }

.venue-cards {
  display: grid; grid-template-columns: repeat(2, 1fr);
  gap: 1.2rem; max-width: 800px;
}
.venue-detail-card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: 12px; padding: 1.4rem;
  display: flex; gap: 1rem; align-items: flex-start;
  transition: border-color .2s;
}
.venue-detail-card:hover { border-color: rgba(200,169,110,0.3); }
.venue-icon { font-size: 1.4rem; flex-shrink: 0; }
.venue-detail-card h4 { font-size: 0.88rem; font-weight: 700; margin-bottom: 0.35rem; }
.venue-detail-card p  { font-size: 0.83rem; color: var(--gray); line-height: 1.6; }

/* ── Responsive ── */
@media (max-width: 600px) {
  .page { padding: 1rem; }
  .cal-day { min-height: 60px; }
  .cal-slot { font-size: 0.65rem; }
  .card { flex-direction: column; align-items: flex-start; }
}