:root {
  --app-bg: #f8fafc;
  --app-surface: rgba(255, 255, 255, 0.88);
  --app-surface-strong: #ffffff;
  --app-text: #0f172a;
  --app-muted: #475569;
  --app-border: rgba(148, 163, 184, 0.22);
  --app-primary: #2563eb;
  --app-primary-deep: #0f172a;
  --app-soft: #dbeafe;
  --app-success: #16a34a;
  --app-danger: #dc2626;
  --app-shadow: 0 24px 80px rgba(15, 23, 42, 0.12);
  --app-radius: 24px;
}

html[data-bs-theme="dark"] {
  --app-bg: #020617;
  --app-surface: rgba(15, 23, 42, 0.82);
  --app-surface-strong: #0f172a;
  --app-text: #f8fafc;
  --app-muted: #cbd5e1;
  --app-border: rgba(148, 163, 184, 0.16);
  --app-primary: #60a5fa;
  --app-primary-deep: #dbeafe;
  --app-soft: rgba(37, 99, 235, 0.16);
  --app-success: #4ade80;
  --app-danger: #f87171;
  --app-shadow: 0 24px 80px rgba(2, 6, 23, 0.45);
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  color: var(--app-text);
  background:
    radial-gradient(circle at top left, rgba(37, 99, 235, 0.22), transparent 28%),
    radial-gradient(circle at top right, rgba(15, 23, 42, 0.18), transparent 22%),
    linear-gradient(180deg, rgba(248, 250, 252, 0.96), rgba(241, 245, 249, 1));
  transition: background-color 0.35s ease, color 0.35s ease;
}

html[data-bs-theme="dark"] body {
  background:
    radial-gradient(circle at top left, rgba(96, 165, 250, 0.16), transparent 24%),
    radial-gradient(circle at top right, rgba(37, 99, 235, 0.12), transparent 18%),
    linear-gradient(180deg, #020617, #0f172a);
}

code {
  color: var(--app-primary);
}

.app-shell {
  padding: 1.25rem 0 0;
}

.app-content {
  padding-bottom: 2rem;
}

.app-navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 1.25rem;
  border: 1px solid var(--app-border);
  border-radius: 999px;
  background: var(--app-surface);
  backdrop-filter: blur(20px);
  box-shadow: var(--app-shadow);
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  gap: 0.875rem;
  color: var(--app-text);
}

.brand-mark strong,
.brand-mark small {
  display: block;
  line-height: 1.1;
}

.brand-mark small {
  color: var(--app-muted);
}

.brand-logo {
  display: inline-grid;
  place-items: center;
  width: 52px;
  height: 52px;
  border-radius: 18px;
  color: #fff;
  font-weight: 800;
  letter-spacing: 0.08em;
  background: linear-gradient(135deg, var(--app-primary), #60a5fa);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.28);
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  border-radius: 999px;
  border: 1px solid var(--app-border);
  background: var(--app-surface-strong);
  color: var(--app-text);
  padding: 0.75rem 1rem;
}

.icon-sun,
.icon-moon {
  width: 1rem;
  height: 1rem;
}

html[data-bs-theme="light"] .icon-moon,
html[data-bs-theme="dark"] .icon-sun {
  display: none;
}

.hero-panel,
.progress-panel,
.toolbar-panel,
.tabs-panel,
.stat-card {
  border: 1px solid var(--app-border);
  background: var(--app-surface);
  backdrop-filter: blur(20px);
  box-shadow: var(--app-shadow);
}

.hero-panel {
  display: grid;
  gap: 1.5rem;
  padding: 1.5rem;
  margin-top: 1.5rem;
  border-radius: var(--app-radius);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.45rem 0.8rem;
  border-radius: 999px;
  background: var(--app-soft);
  color: var(--app-primary);
  font-weight: 700;
  margin-bottom: 1rem;
}

.hero-panel h1 {
  max-width: 12ch;
  font-size: clamp(2rem, 5vw, 4rem);
  line-height: 0.98;
  letter-spacing: -0.04em;
  margin-bottom: 1rem;
}

.hero-panel p,
.stat-helper,
.empty-state p,
.sticker-meta,
.toolbar-meta,
.hero-note {
  color: var(--app-muted);
}

.hero-actions {
  display: grid;
  gap: 1rem;
  align-content: center;
}

.hero-note {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 1rem 1.1rem;
  border-radius: 20px;
  background: var(--app-surface-strong);
}

.stats-grid {
  display: grid;
  gap: 1rem;
  margin-top: 1.5rem;
}

.stat-card {
  padding: 1.25rem;
  border-radius: 22px;
}

.stat-card.accent-primary {
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.95), rgba(96, 165, 250, 0.9));
  color: #fff;
}

.stat-card.accent-primary .stat-helper,
.stat-card.accent-primary .stat-label {
  color: rgba(255, 255, 255, 0.82);
}

.stat-card.accent-soft {
  background: linear-gradient(135deg, var(--app-soft), var(--app-surface-strong));
}

.stat-label {
  font-size: 0.95rem;
  color: var(--app-muted);
  margin-bottom: 0.45rem;
}

.stat-value {
  font-size: clamp(1.8rem, 4vw, 2.7rem);
  font-weight: 800;
  line-height: 1;
  margin-bottom: 0.5rem;
}

.progress-panel,
.toolbar-panel,
.tabs-panel {
  margin-top: 1.5rem;
  border-radius: var(--app-radius);
  padding: 1.35rem;
}

.progress-copy {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: end;
  margin-bottom: 1rem;
}

.section-title {
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.78rem;
  color: var(--app-muted);
  margin-bottom: 0.35rem;
}

.progress-badge,
.filter-pill,
.status-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.5rem 0.8rem;
  border-radius: 999px;
  background: var(--app-soft);
  color: var(--app-primary);
  font-weight: 700;
}

.progress-track {
  width: 100%;
  height: 16px;
  background: rgba(148, 163, 184, 0.2);
  border-radius: 999px;
  overflow: hidden;
}

.progress-fill {
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--app-primary), #60a5fa);
  border-radius: inherit;
  transition: width 0.35s ease;
}

.progress-scale {
  display: flex;
  justify-content: space-between;
  margin-top: 0.75rem;
  color: var(--app-muted);
  font-size: 0.9rem;
}

.toolbar-panel {
  display: grid;
  gap: 1rem;
}

.search-box {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  border: 1px solid var(--app-border);
  border-radius: 18px;
  background: var(--app-surface-strong);
  padding: 0.85rem 1rem;
}

.search-box .form-control {
  border: 0;
  background: transparent;
  box-shadow: none;
  padding: 0;
  color: var(--app-text);
}

.toolbar-meta {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.75rem;
  align-items: center;
}

.toolbar-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.filters-grid {
  display: grid;
  gap: 0.9rem;
}

.filter-select {
  display: grid;
  gap: 0.45rem;
}

.filter-select label {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--app-muted);
}

.filter-select .form-select {
  border-radius: 16px;
  border-color: var(--app-border);
  background-color: var(--app-surface-strong);
  color: var(--app-text);
  box-shadow: none;
}

.album-tabs {
  gap: 0.75rem;
  margin-bottom: 1.25rem;
}

.album-tabs .nav-link {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.9rem 1rem;
  border-radius: 16px;
  font-weight: 700;
  color: var(--app-muted);
  background: transparent;
}

.album-tabs .nav-link.active {
  color: #fff;
  background: linear-gradient(135deg, var(--app-primary), #60a5fa);
  box-shadow: 0 14px 32px rgba(37, 99, 235, 0.22);
}

.tab-count,
.duplicate-badge {
  min-width: 2rem;
  text-align: center;
  border-radius: 999px;
  padding: 0.2rem 0.55rem;
  background: rgba(255, 255, 255, 0.2);
  font-size: 0.85rem;
}

.cards-grid {
  display: grid;
  gap: 1rem;
}

.sticker-card {
  position: relative;
  overflow: hidden;
  display: grid;
  gap: 1rem;
  padding: 1rem;
  border-radius: 24px;
  border: 1px solid var(--app-border);
  background: var(--app-surface-strong);
  transition: transform 0.28s ease, box-shadow 0.28s ease, opacity 0.28s ease;
  animation: fade-up 0.35s ease both;
}

.sticker-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 18px 36px rgba(15, 23, 42, 0.12);
}

.sticker-top {
  display: flex;
  gap: 1rem;
  align-items: start;
}

.placeholder-image {
  flex: 0 0 88px;
  height: 112px;
  display: grid;
  place-items: center;
  border-radius: 20px;
  background: linear-gradient(160deg, rgba(37, 99, 235, 0.18), rgba(15, 23, 42, 0.08));
  color: var(--app-primary);
  font-size: 1.65rem;
  font-weight: 800;
  letter-spacing: 0.04em;
}

.sticker-body {
  min-width: 0;
  flex: 1 1 auto;
}

.sticker-number {
  font-size: 0.82rem;
  color: var(--app-primary);
  font-weight: 800;
  letter-spacing: 0.08em;
  margin-bottom: 0.35rem;
}

.sticker-name {
  font-size: 1.12rem;
  font-weight: 800;
  margin-bottom: 0.35rem;
}

.sticker-selection {
  margin-bottom: 0.65rem;
}

.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}

.sticker-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.sticker-actions .btn {
  border-radius: 14px;
}

.counter-box {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  padding: 0.5rem;
  border-radius: 16px;
  border: 1px solid var(--app-border);
  background: var(--app-bg);
}

.counter-value {
  min-width: 2ch;
  text-align: center;
  font-weight: 800;
}

.empty-state {
  display: grid;
  place-items: center;
  text-align: center;
  gap: 0.75rem;
  padding: 2rem 1rem;
  border: 1px dashed var(--app-border);
  border-radius: 24px;
  background: rgba(148, 163, 184, 0.08);
}

.empty-icon {
  display: inline-grid;
  place-items: center;
  width: 64px;
  height: 64px;
  border-radius: 20px;
  background: var(--app-soft);
  color: var(--app-primary);
}

.app-icon {
  width: 1rem;
  height: 1rem;
  fill: currentColor;
  flex: 0 0 auto;
}

.sticker-card.removing {
  opacity: 0;
  transform: scale(0.96);
}

.btn-primary {
  background: var(--app-primary);
  border-color: var(--app-primary);
}

.btn-outline-secondary {
  color: var(--app-text);
  border-color: var(--app-border);
}

.btn-outline-danger {
  border-color: rgba(220, 38, 38, 0.28);
  color: var(--app-danger);
}

.btn-outline-primary {
  border-color: rgba(37, 99, 235, 0.28);
  color: var(--app-primary);
}

.toast {
  border-radius: 18px;
  box-shadow: var(--app-shadow);
}

@keyframes fade-up {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (min-width: 768px) {
  .hero-panel {
    grid-template-columns: minmax(0, 1.5fr) minmax(280px, 0.9fr);
    align-items: center;
    padding: 2rem;
  }

  .stats-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .toolbar-panel {
    grid-template-columns: minmax(0, 1.5fr) minmax(280px, 1fr);
    align-items: center;
  }

  .filters-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .cards-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1200px) {
  .cards-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 767.98px) {
  .app-navbar {
    border-radius: 28px;
    padding: 1rem;
  }

  .theme-toggle span,
  .progress-copy {
    font-size: 0.95rem;
  }

  .progress-copy,
  .toolbar-meta {
    flex-direction: column;
    align-items: start;
  }

  .album-tabs {
    flex-wrap: nowrap;
    overflow-x: auto;
    padding-bottom: 0.35rem;
  }

  .album-tabs .nav-link {
    white-space: nowrap;
  }

  .placeholder-image {
    flex-basis: 72px;
    height: 96px;
  }
}