/* ============================================================
   main.css
   Layout landing page utama: hero, kelas grid, background blobs,
   footer, theme switcher, dll.
   ============================================================ */

/* ---------- Floating background blobs ---------- */
.bg-blobs {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  overflow: hidden;
}

.blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.55;
  will-change: transform;
}

.blob-1 {
  width: 480px;
  height: 480px;
  background: var(--blob-1);
  top: -120px;
  left: -120px;
  animation: blobFloat 16s ease-in-out infinite;
}

.blob-2 {
  width: 420px;
  height: 420px;
  background: var(--blob-2);
  top: 30%;
  right: -140px;
  animation: blobFloat 20s ease-in-out infinite;
  animation-delay: -6s;
}

.blob-3 {
  width: 380px;
  height: 380px;
  background: var(--blob-3);
  bottom: -120px;
  left: 30%;
  animation: blobFloat 22s ease-in-out infinite;
  animation-delay: -10s;
}

.grid-overlay {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image: linear-gradient(var(--color-border) 1px, transparent 1px),
                    linear-gradient(90deg, var(--color-border) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse at top, black 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse at top, black 30%, transparent 75%);
  opacity: 0.4;
}

/* ---------- Layout ---------- */
.container {
  width: min(1120px, 100% - 2.5rem);
  margin: 0 auto;
}

/* ---------- Top bar ---------- */
.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  padding: 0.85rem 0;
  -webkit-backdrop-filter: blur(18px) saturate(180%);
  backdrop-filter: blur(18px) saturate(180%);
  background: color-mix(in srgb, var(--glass-bg) 70%, transparent);
  border-bottom: 1px solid var(--glass-border-soft);
}

.topbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
}

.brand-logo {
  height: 48px;
  border-radius: 12px;
  object-fit: cover;
  flex-shrink: 0;
  box-shadow: 0 10px 24px -10px var(--color-primary-glow),
              inset 0 0 0 1px rgba(255, 255, 255, 0.06);
  background: white;
  padding-right: 20px;
  padding-left: 20px;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.brand-name {
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.brand-sub {
  font-size: 0.7rem;
  color: var(--color-text-subtle);
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.topbar-actions {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
}

/* ---------- Hero ---------- */
.hero {
  padding: 5rem 0 3rem;
  text-align: center;
  position: relative;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.85rem;
  border-radius: 999px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border-soft);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--color-text-muted);
  letter-spacing: 0.04em;
  margin-bottom: 1.5rem;
}

.hero-badge .dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--color-accent);
  box-shadow: 0 0 0 4px var(--color-accent-soft);
  animation: pulseGlow 2.4s ease-in-out infinite;
}

.hero-title {
  font-size: clamp(2.1rem, 5vw, 3.5rem);
  line-height: 1.05;
  font-weight: 800;
  letter-spacing: -0.035em;
  margin-bottom: 1rem;
  background: var(--gradient-text);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-subtitle {
  max-width: 580px;
  margin: 0 auto;
  font-size: clamp(0.95rem, 1.6vw, 1.05rem);
  color: var(--color-text-muted);
  line-height: 1.6;
}

.hero-stats {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-top: 2rem;
  justify-content: center;
}

.stat-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.95rem;
  border-radius: 999px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border-soft);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  font-size: 0.82rem;
  color: var(--color-text-muted);
  font-weight: 500;
}

.stat-pill strong {
  color: var(--color-text);
  font-weight: 700;
}

/* ---------- Class sections ---------- */
.classes-section {
  padding: 2.5rem 0 4rem;
}

.category {
  margin-bottom: 2.4rem;
}

.category-head {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  margin-bottom: 1rem;
  padding: 0 0.2rem;
}

.category-title {
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.category-meta {
  font-size: 0.78rem;
  color: var(--color-text-subtle);
  font-weight: 500;
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  background: var(--color-primary-soft);
  color: var(--color-primary);
}

.category-line {
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, var(--color-border-strong), transparent);
}

.class-grid {
  display: grid;
  gap: 0.85rem;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
}

.class-card {
  position: relative;
  display: flex;
  align-items: center;
  gap: 0.85rem;
  padding: 1rem 1.1rem;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border-soft);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  backdrop-filter: blur(20px) saturate(180%);
  border-radius: 16px;
  text-align: left;
  transition: transform 0.22s cubic-bezier(0.22, 1, 0.36, 1),
              box-shadow 0.25s ease, border-color 0.2s ease,
              background 0.2s ease;
  width: 100%;
  cursor: pointer;
  overflow: hidden;
}

.class-card::before {
  content: "";
  position: absolute;
  inset: -1px;
  border-radius: inherit;
  background: var(--gradient-primary);
  opacity: 0;
  z-index: -1;
  transition: opacity 0.25s ease;
}

.class-card:hover {
  transform: translateY(-3px);
  border-color: var(--color-primary);
  background: var(--glass-bg-strong);
  box-shadow: 0 18px 36px -16px var(--color-primary-glow);
}

.class-card:active {
  transform: translateY(0) scale(0.99);
}

.class-avatar {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.95rem;
  color: #fff;
  flex-shrink: 0;
  background: var(--gradient-primary);
  box-shadow: 0 6px 14px -6px var(--color-primary-glow);
  position: relative;
}

.class-avatar.alt-1 { background: linear-gradient(135deg, #2563EB, #06B6D4); }
.class-avatar.alt-2 { background: linear-gradient(135deg, #F97316, #F59E0B); }
.class-avatar.alt-3 { background: linear-gradient(135deg, #8B5CF6, #EC4899); }
.class-avatar.alt-4 { background: linear-gradient(135deg, #10B981, #06B6D4); }

.class-info {
  flex: 1;
  min-width: 0;
}

.class-name {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.01em;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.class-meta {
  font-size: 0.74rem;
  color: var(--color-text-subtle);
  font-weight: 500;
  margin-top: 0.15rem;
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
}

.class-meta.locked::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-accent);
}

.class-meta.unlocked::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-success);
}

.class-arrow {
  color: var(--color-text-subtle);
  flex-shrink: 0;
  transition: transform 0.25s ease, color 0.2s ease;
}

.class-card:hover .class-arrow {
  transform: translateX(3px);
  color: var(--color-primary);
}

/* ---------- Footer ---------- */
.footer {
  padding: 2rem 0 2.5rem;
  text-align: center;
  border-top: 1px solid var(--glass-border-soft);
  margin-top: 2rem;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.85rem;
}

.footer-brand {
  font-weight: 700;
  font-size: 0.95rem;
  letter-spacing: -0.01em;
}

.footer-meta {
  font-size: 0.78rem;
  color: var(--color-text-subtle);
}

.footer-divider {
  width: 60px;
  height: 2px;
  border-radius: 2px;
  background: var(--gradient-text);
}

/* ---------- Theme switcher ---------- */
.theme-toggle {
  width: 38px;
  height: 38px;
  border-radius: 12px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border-soft);
  color: var(--color-text-muted);
  transition: background 0.2s ease, color 0.2s ease, transform 0.25s ease;
}

.theme-toggle:hover {
  background: var(--color-primary-soft);
  color: var(--color-text);
  transform: rotate(20deg);
}

.theme-toggle .sun,
.theme-toggle .moon {
  position: absolute;
  transition: opacity 0.3s ease, transform 0.3s ease;
}

.theme-toggle {
  position: relative;
}

[data-theme="light"] .theme-toggle .sun { opacity: 0; transform: scale(0.5) rotate(-90deg); }
[data-theme="light"] .theme-toggle .moon { opacity: 1; transform: scale(1) rotate(0); }
[data-theme="dark"] .theme-toggle .sun { opacity: 1; transform: scale(1) rotate(0); }
[data-theme="dark"] .theme-toggle .moon { opacity: 0; transform: scale(0.5) rotate(90deg); }

/* ---------- Password modal extras ---------- */
.lock-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 0.4rem;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--gradient-primary);
  color: #fff;
  box-shadow: 0 14px 30px -10px var(--color-primary-glow),
              inset 0 1px 0 rgba(255, 255, 255, 0.25);
  position: relative;
}

.lock-icon::after {
  content: "";
  position: absolute;
  inset: -6px;
  border-radius: 50%;
  border: 2px solid var(--color-primary-soft);
}

.modal-card.password-card {
  width: min(440px, 100%);
}

.password-title {
  text-align: center;
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 0.3rem;
}

.password-desc {
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.88rem;
  margin-bottom: 1.2rem;
  line-height: 1.5;
}

.password-loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.85rem;
  padding: 1.2rem 0 0.4rem;
}

.password-loading .spinner {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 3px solid var(--color-primary-soft);
  border-top-color: var(--color-primary);
  animation: spin 0.9s linear infinite;
}

.password-loading-text {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.success-check {
  width: 72px;
  height: 72px;
  margin: 0 auto 0.6rem;
  border-radius: 50%;
  background: rgba(16, 185, 129, 0.12);
  color: var(--color-success);
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.success-check svg path {
  stroke-dasharray: 100;
  animation: checkmark 0.6s ease forwards;
}

@media (max-width: 640px) {
  .hero { padding: 3.5rem 0 2rem; }
  .topbar-inner { gap: 0.5rem; }
  .brand-name { font-size: 0.88rem; }
  .brand-sub { font-size: 0.62rem; }
  .class-grid { grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 0.7rem; }
  .modal-card { border-radius: 18px; }
}