/* Klassikl design system — blue/purple/orange, tuned for fast class discovery. */

:root {
  --klx-blue-50: #eef2ff;
  --klx-blue-100: #e0e7ff;
  --klx-blue-400: #6182ff;
  --klx-blue-500: #3b5bfb;
  --klx-blue-600: #2f46e0;
  --klx-blue-700: #2536b8;

  --klx-purple-50: #f5f1ff;
  --klx-purple-100: #ece3ff;
  --klx-purple-400: #9a6bf0;
  --klx-purple-500: #7c3aed;
  --klx-purple-600: #6d28d9;
  --klx-purple-700: #5b21b6;

  --klx-orange-50: #fff4eb;
  --klx-orange-100: #ffe4cc;
  --klx-orange-400: #ff9a52;
  --klx-orange-500: #fb7a2e;
  --klx-orange-600: #e8600f;

  --klx-ink-900: #10131f;
  --klx-ink-800: #1f2437;
  --klx-ink-600: #4b5266;
  --klx-ink-400: #7d84a0;
  --klx-line: #e7e9f4;
  --klx-line-strong: #d7daec;
  --klx-surface: #f6f7fd;
  --klx-surface-alt: #ffffff;

  --klx-gradient-hero: linear-gradient(135deg, #3b5bfb 0%, #6d3ef0 55%, #9333ea 100%);
  --klx-gradient-accent: linear-gradient(135deg, #ff9a52 0%, #fb7a2e 100%);
  --klx-gradient-cool: linear-gradient(135deg, #6182ff 0%, #9a6bf0 100%);

  --klx-radius-sm: 10px;
  --klx-radius: 16px;
  --klx-radius-lg: 22px;
  --klx-shadow-sm: 0 1px 2px rgba(16, 19, 31, 0.06);
  --klx-shadow: 0 8px 24px rgba(31, 36, 74, 0.08);
  --klx-shadow-lg: 0 20px 45px rgba(31, 36, 74, 0.16);
}

/* ---------- base ---------- */

html { font-size: 15px; }
@media (min-width: 768px) { html { font-size: 16px; } }

body {
  font-family: "Plus Jakarta Sans", "Segoe UI", system-ui, -apple-system, sans-serif;
  background: var(--klx-surface);
  color: var(--klx-ink-800);
  margin-bottom: 0;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  color: var(--klx-ink-900);
  letter-spacing: -0.01em;
}

a { color: var(--klx-blue-600); text-decoration: none; }
a:hover { color: var(--klx-purple-600); }

.text-muted { color: var(--klx-ink-400) !important; }

main.container { max-width: 1140px; }

.btn:focus, .btn:active:focus, .btn-link.nav-link:focus,
.form-control:focus, .form-select:focus, .form-check-input:focus {
  box-shadow: 0 0 0 3px var(--klx-blue-100);
}

/* ---------- buttons ---------- */

.btn {
  border-radius: var(--klx-radius-sm);
  font-weight: 600;
  padding-block: 0.55rem;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease, color 0.15s ease;
}
.btn-sm { border-radius: 8px; }
.btn-lg { border-radius: 14px; }

.btn-primary {
  --bs-btn-bg: var(--klx-blue-500);
  --bs-btn-border-color: var(--klx-blue-500);
  --bs-btn-hover-bg: var(--klx-blue-600);
  --bs-btn-hover-border-color: var(--klx-blue-600);
  --bs-btn-active-bg: var(--klx-blue-700);
  --bs-btn-active-border-color: var(--klx-blue-700);
  --bs-btn-focus-shadow-rgb: 59, 91, 251;
  box-shadow: 0 6px 16px rgba(59, 91, 251, 0.25);
}
.btn-primary:hover { transform: translateY(-1px); }

.btn-outline-primary {
  --bs-btn-color: var(--klx-blue-600);
  --bs-btn-border-color: var(--klx-blue-400);
  --bs-btn-hover-bg: var(--klx-blue-500);
  --bs-btn-hover-border-color: var(--klx-blue-500);
  --bs-btn-active-bg: var(--klx-blue-600);
  --bs-btn-active-border-color: var(--klx-blue-600);
}

.btn-secondary {
  --bs-btn-bg: var(--klx-purple-500);
  --bs-btn-border-color: var(--klx-purple-500);
  --bs-btn-hover-bg: var(--klx-purple-600);
  --bs-btn-hover-border-color: var(--klx-purple-600);
  --bs-btn-active-bg: var(--klx-purple-700);
  --bs-btn-active-border-color: var(--klx-purple-700);
}

.btn-outline-secondary {
  --bs-btn-color: var(--klx-ink-600);
  --bs-btn-border-color: var(--klx-line-strong);
  --bs-btn-hover-color: #fff;
  --bs-btn-hover-bg: var(--klx-purple-500);
  --bs-btn-hover-border-color: var(--klx-purple-500);
}

.btn-accent {
  color: #fff;
  background: var(--klx-gradient-accent);
  border: none;
  box-shadow: 0 8px 20px rgba(251, 122, 46, 0.35);
}
.btn-accent:hover { color: #fff; transform: translateY(-1px); filter: brightness(1.04); }

.btn-outline-danger { --bs-btn-hover-color: #fff; }

/* ---------- navbar ---------- */

.navbar.klx-navbar {
  position: sticky;
  top: 0;
  z-index: 1030;
  background: rgba(255, 255, 255, 0.92) !important;
  backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--klx-line);
  box-shadow: none !important;
  padding-block: 0.65rem;
}

.klx-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 800;
  font-size: 1.25rem;
  color: var(--klx-ink-900) !important;
}
.klx-brand-mark {
  width: 34px;
  height: 34px;
  border-radius: 10px;
  background: var(--klx-gradient-hero);
  color: #fff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1rem;
  box-shadow: 0 6px 14px rgba(59, 91, 251, 0.35);
}

.klx-navbar .nav-link {
  color: var(--klx-ink-600) !important;
  font-weight: 600;
  padding: 0.5rem 0.85rem !important;
  border-radius: 999px;
  transition: background 0.15s ease, color 0.15s ease;
}
.klx-navbar .nav-link:hover { color: var(--klx-blue-600) !important; background: var(--klx-blue-50); }
.klx-navbar .nav-link.active { color: var(--klx-blue-600) !important; background: var(--klx-blue-50); }

/* ---------- hero ---------- */

.klx-hero {
  background: var(--klx-gradient-hero);
  border-radius: 0 0 32px 32px;
  color: #fff;
  padding: 3.5rem 1.5rem 4.5rem;
  margin-bottom: -2.5rem;
  position: relative;
  overflow: hidden;
}
.klx-hero::before, .klx-hero::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.12);
}
.klx-hero::before { width: 320px; height: 320px; top: -140px; right: -80px; }
.klx-hero::after { width: 220px; height: 220px; bottom: -120px; left: 8%; background: rgba(255, 154, 82, 0.18); }
.klx-hero .container { position: relative; z-index: 1; }

.klx-hero h1 { color: #fff; font-size: clamp(2rem, 4vw, 2.9rem); }
.klx-hero p.lead { color: rgba(255, 255, 255, 0.88); }

.klx-search-card {
  background: var(--klx-surface-alt);
  border-radius: var(--klx-radius-lg);
  box-shadow: var(--klx-shadow-lg);
  padding: 0.75rem;
  position: relative;
  z-index: 2;
}
.klx-search-card .form-control {
  border: none;
  font-size: 1.05rem;
  padding-block: 0.75rem;
}
.klx-search-card .form-control:focus { box-shadow: none; }

.klx-category-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: rgba(255, 255, 255, 0.16);
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.35);
  border-radius: 999px;
  padding: 0.35rem 0.9rem;
  font-size: 0.85rem;
  font-weight: 600;
  transition: background 0.15s ease;
}
.klx-category-pill:hover { background: rgba(255, 255, 255, 0.28); color: #fff; }

/* ---------- filter chips (browse page) ---------- */

.klx-filter-bar {
  background: var(--klx-surface-alt);
  border: 1px solid var(--klx-line);
  border-radius: var(--klx-radius);
  box-shadow: var(--klx-shadow-sm);
  padding: 1.1rem 1.25rem;
}

.klx-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  border: 1px solid var(--klx-line-strong);
  background: var(--klx-surface-alt);
  color: var(--klx-ink-600);
  border-radius: 999px;
  padding: 0.35rem 0.85rem;
  font-size: 0.85rem;
  font-weight: 600;
  transition: all 0.15s ease;
}
.klx-chip:hover { border-color: var(--klx-blue-400); color: var(--klx-blue-600); }
.klx-chip.active {
  background: var(--klx-gradient-hero);
  border-color: transparent;
  color: #fff;
}

/* ---------- role chips (admin user management) ---------- */

.klx-role-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  border: none;
  border-radius: 999px;
  padding: 0.3rem 0.7rem;
  font-size: 0.78rem;
  font-weight: 700;
  background: var(--klx-purple-100);
  color: var(--klx-purple-700);
  transition: background 0.15s ease, color 0.15s ease;
}
.klx-role-chip:hover { background: #fbdcdc; color: #b42318; }
.klx-role-chip-add {
  display: inline-flex;
  align-items: center;
  border: 1px dashed var(--klx-line-strong);
  border-radius: 999px;
  padding: 0.3rem 0.7rem;
  font-size: 0.78rem;
  font-weight: 600;
  background: transparent;
  color: var(--klx-ink-400);
  transition: all 0.15s ease;
}
.klx-role-chip-add:hover { border-color: var(--klx-blue-400); color: var(--klx-blue-600); }

/* ---------- cards ---------- */

.card {
  border: 1px solid var(--klx-line);
  border-radius: var(--klx-radius);
  box-shadow: var(--klx-shadow-sm);
}

.klx-class-card {
  overflow: hidden;
  transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
}
.klx-class-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--klx-shadow-lg);
  border-color: var(--klx-blue-100);
}

.klx-card-cover {
  height: 128px;
  position: relative;
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  padding: 0.75rem;
  background-size: cover;
  background-position: center;
  color: #fff;
}
.klx-cover-1 { background-image: linear-gradient(135deg, #3b5bfb 0%, #7c3aed 100%); }
.klx-cover-2 { background-image: linear-gradient(135deg, #7c3aed 0%, #fb7a2e 100%); }
.klx-cover-3 { background-image: linear-gradient(135deg, #2f46e0 0%, #6182ff 60%, #9a6bf0 100%); }
.klx-cover-4 { background-image: linear-gradient(135deg, #5b21b6 0%, #3b5bfb 100%); }
.klx-cover-5 { background-image: linear-gradient(135deg, #fb7a2e 0%, #7c3aed 100%); }
.klx-card-cover .klx-cover-label {
  font-weight: 800;
  font-size: 1.05rem;
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.15);
  max-width: 75%;
}
.klx-card-cover .klx-mode-badge {
  background: rgba(16, 19, 31, 0.45);
  backdrop-filter: blur(4px);
  border-radius: 999px;
  padding: 0.25rem 0.6rem;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}
.klx-card-cover .klx-featured-badge {
  position: absolute;
  top: 0.65rem;
  left: 0.65rem;
  background: var(--klx-gradient-accent);
  border-radius: 999px;
  padding: 0.25rem 0.7rem;
  font-size: 0.72rem;
  font-weight: 700;
}
.klx-card-cover-icon {
  position: absolute;
  top: 0.9rem;
  right: 0.9rem;
  width: 34px;
  height: 34px;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.22);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
}

.klx-price-tag {
  font-weight: 800;
  color: var(--klx-ink-900);
}
.klx-price-tag small { font-weight: 600; color: var(--klx-ink-400); }

/* ---------- badges / pills ---------- */

.badge { font-weight: 600; border-radius: 999px; padding: 0.4em 0.75em; }
.badge.bg-light { background: var(--klx-blue-50) !important; color: var(--klx-blue-700) !important; }
.badge.bg-warning { background: var(--klx-orange-100) !important; color: var(--klx-orange-600) !important; }
.badge.bg-purple { background: var(--klx-purple-100) !important; color: var(--klx-purple-700) !important; }
.badge.bg-primary { background: var(--klx-blue-500) !important; }

.klx-rating { color: var(--klx-orange-500); font-weight: 700; }

/* ---------- forms ---------- */

.form-control, .form-select {
  border-radius: var(--klx-radius-sm);
  border-color: var(--klx-line-strong);
  padding-block: 0.55rem;
}
.form-control:focus, .form-select:focus {
  border-color: var(--klx-blue-400);
}
.input-group .form-control { border-radius: var(--klx-radius-sm); }

/* ---------- sections ---------- */

.klx-section-title {
  position: relative;
  padding-left: 1rem;
  margin-bottom: 1rem;
}
.klx-section-title::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.2em;
  bottom: 0.2em;
  width: 5px;
  border-radius: 999px;
  background: var(--klx-gradient-hero);
}

.klx-feature-card {
  border: 1px solid var(--klx-line);
  border-radius: var(--klx-radius);
  background: var(--klx-surface-alt);
  padding: 1.5rem;
  height: 100%;
}
.klx-feature-icon {
  width: 46px;
  height: 46px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  color: #fff;
  margin-bottom: 0.9rem;
}

/* ---------- tables ---------- */

.table thead th {
  background: var(--klx-blue-50);
  color: var(--klx-blue-700);
  font-weight: 700;
  border-bottom: none;
  text-transform: uppercase;
  font-size: 0.75rem;
  letter-spacing: 0.03em;
}
.table.klx-table { border-radius: var(--klx-radius); overflow: hidden; border: 1px solid var(--klx-line); }
.table.klx-table td, .table.klx-table th { border-color: var(--klx-line); vertical-align: middle; }

/* ---------- alerts ---------- */

.alert { border: none; border-radius: var(--klx-radius-sm); }
.alert-info { background: var(--klx-blue-50); color: var(--klx-blue-700); }
.alert-warning { background: var(--klx-orange-50); color: var(--klx-orange-600); }
.alert-light { background: var(--klx-surface); color: var(--klx-ink-600); }

/* ---------- footer ---------- */

footer.klx-footer {
  background: var(--klx-ink-900);
  color: rgba(255, 255, 255, 0.65);
  margin-top: 4rem;
  padding: 2.5rem 0;
}
footer.klx-footer a { color: rgba(255, 255, 255, 0.85); }
footer.klx-footer a:hover { color: var(--klx-orange-400); }
footer.klx-footer .klx-brand { color: #fff !important; }

/* ---------- misc ---------- */

.klx-empty-state {
  text-align: center;
  padding: 3rem 1.5rem;
  border: 1px dashed var(--klx-line-strong);
  border-radius: var(--klx-radius);
  background: var(--klx-surface-alt);
  color: var(--klx-ink-600);
}

.breadcrumb { background: transparent; padding: 0; margin-bottom: 1rem; }

.klx-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--klx-gradient-cool);
  color: #fff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  flex-shrink: 0;
}