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

:root {
  --bg: #111;
  --bg-card: #1a1a1a;
  --bg-card-hover: #222;
  --border: #333;
  --text: #e5e5e5;
  --text-muted: #888;
  --accent: #f59e0b;
  --accent-dim: #92610b;
  --military: #4a5568;
  --special: #2b6cb0;
  --mastery: #d69e2e;
  --complete: #22c55e;
  --progress-bg: #2a2a2a;
  --arclight: #6366f1;
  --shattered-gold: #d69e2e;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  padding-bottom: 2rem;
}

/* Header */
header {
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  padding: 1rem 1.25rem;
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

h1 {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  color: var(--accent);
}

.header-actions {
  display: flex;
  gap: 0.5rem;
}

.btn {
  padding: 0.4rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg);
  color: var(--text);
  font-size: 0.8rem;
  cursor: pointer;
  transition: background 0.15s;
}

.btn:hover {
  background: var(--bg-card-hover);
}

/* Progress summary */
.progress-summary {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.progress-text {
  display: flex;
  justify-content: space-between;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.progress-bar-track {
  height: 8px;
  background: var(--progress-bg);
  border-radius: 4px;
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  background: var(--accent);
  border-radius: 4px;
  transition: width 0.3s ease;
  width: 0%;
}

.progress-bar-fill.complete {
  background: var(--complete);
}

/* Class filter */
.class-filter {
  display: flex;
  gap: 0.4rem;
  padding: 0.75rem 1.25rem;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
}

.class-filter button {
  flex-shrink: 0;
  padding: 0.4rem 0.85rem;
  border: 1px solid var(--border);
  border-radius: 20px;
  background: var(--bg-card);
  color: var(--text-muted);
  font-size: 0.8rem;
  cursor: pointer;
  transition: all 0.15s;
  white-space: nowrap;
}

.class-filter button:hover {
  border-color: var(--accent-dim);
  color: var(--text);
}

.class-filter button.active {
  background: var(--accent);
  color: #000;
  border-color: var(--accent);
  font-weight: 600;
}

/* Weapon list */
.weapon-list {
  padding: 0.75rem 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

/* Weapon card */
.weapon-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}

.weapon-header {
  display: flex;
  align-items: center;
  padding: 0.85rem 1rem;
  cursor: pointer;
  gap: 0.75rem;
  user-select: none;
  transition: background 0.15s;
}

.weapon-header:hover {
  background: var(--bg-card-hover);
}

.weapon-expand {
  font-size: 0.7rem;
  color: var(--text-muted);
  transition: transform 0.2s;
  flex-shrink: 0;
  width: 1rem;
  text-align: center;
}

.weapon-card.open .weapon-expand {
  transform: rotate(90deg);
}

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

.weapon-name {
  font-weight: 600;
  font-size: 0.95rem;
}

.weapon-class {
  font-size: 0.8rem;
  color: #888;
  margin-top: 0.25rem;
}

.weapon-progress {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-shrink: 0;
}

.weapon-progress-text {
  font-size: 0.8rem;
  color: var(--text-muted);
  white-space: nowrap;
}

.weapon-progress-bar {
  width: 60px;
  height: 6px;
  background: var(--progress-bg);
  border-radius: 3px;
  overflow: hidden;
}

.weapon-progress-bar .progress-bar-fill {
  height: 100%;
}

/* Camo list */
.camo-list {
  display: none;
  border-top: 1px solid var(--border);
  padding: 0.5rem 0;
}

.weapon-card.open .camo-list {
  display: block;
}

.camo-category-label {
  padding: 0.3rem 1rem 0.2rem 2.5rem;
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

.camo-category-label.military { color: var(--military); }
.camo-category-label.special { color: var(--special); }
.camo-category-label.mastery { color: var(--mastery); }

.camo-item {
  display: flex;
  align-items: flex-start;
  padding: 0.45rem 1rem 0.45rem 1.5rem;
  gap: 0.6rem;
  transition: background 0.1s;
  cursor: pointer;
}

.camo-item:hover {
  background: var(--bg-card-hover);
}

.camo-item.completed {
  opacity: 0.5;
}

.camo-item input[type="checkbox"] {
  appearance: none;
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  border: 2px solid var(--border);
  border-radius: 4px;
  flex-shrink: 0;
  margin-top: 1px;
  cursor: pointer;
  position: relative;
  transition: all 0.15s;
}

.camo-item input[type="checkbox"]:checked {
  background: var(--complete);
  border-color: var(--complete);
}

.camo-item input[type="checkbox"]:checked::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  width: 4px;
  height: 8px;
  margin: auto;
  border: solid #000;
  border-width: 0 2px 2px 0;
  transform: translateY(-1px) rotate(45deg);
}

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

.camo-name {
  font-size: 0.85rem;
  font-weight: 500;
}

.camo-requirement {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 0.1rem;
}

.camo-badge {
  font-size: 0.6rem;
  padding: 0.15rem 0.4rem;
  border-radius: 3px;
  font-weight: 600;
  text-transform: uppercase;
  flex-shrink: 0;
  margin-top: 2px;
}

.camo-badge.military { background: var(--military); color: #fff; }
.camo-badge.special { background: var(--special); color: #fff; }
.camo-badge.mastery { background: var(--mastery); color: #000; }

/* Mastery progress section */
.mastery-progress {
  padding: 0.75rem 1.25rem;
}

.mastery-progress .progress-summary {
  margin-bottom: 0.75rem;
}

.mastery-progress-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.5rem;
}

.mastery-progress-grid .camo-tracker-banner:last-child:nth-child(odd) {
  grid-column: 1 / -1;
}

/* Camo tracker banners */
.camo-tracker-banner {
  background: linear-gradient(135deg, #1a1a2e, #16213e, #0f3460);
  border: 2px solid var(--border);
  border-radius: 8px;
  padding: 1rem;
  text-align: center;
}

.camo-tracker-banner h2 {
  font-size: 1rem;
  margin-bottom: 0.25rem;
}

.camo-tracker-banner p {
  color: var(--text-muted);
  font-size: 0.8rem;
}

.camo-tracker-banner .progress-bar-track {
  margin-top: 0.5rem;
}

.camo-tracker-banner .banner-stats {
  margin-top: 0.4rem;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.camo-tracker-banner.unlocked {
  border-color: var(--complete);
}

.camo-tracker-banner.unlocked h2 {
  color: var(--complete);
}

/* Banner color variants */
.camo-tracker-banner.shattered-gold {
  border-color: var(--shattered-gold);
}

.camo-tracker-banner.shattered-gold h2 {
  color: var(--shattered-gold);
}

.camo-tracker-banner.arclight {
  border-color: var(--arclight);
}

.camo-tracker-banner.arclight h2 {
  color: var(--arclight);
}

.camo-tracker-banner.singularity {
  border-color: var(--mastery);
}

.camo-tracker-banner.singularity h2 {
  color: var(--mastery);
}

/* Scrollbar */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 3px;
}

/* Responsive */
@media (max-width: 639px) {
  .mastery-progress-grid {
    grid-template-columns: 1fr;
  }
}

@media (min-width: 640px) {
  header {
    padding: 1.25rem 2rem;
  }

  .class-filter {
    padding: 0.75rem 2rem;
    flex-wrap: wrap;
  }

  .mastery-progress {
    padding: 0.75rem 2rem;
  }

  .weapon-list {
    padding: 1rem 2rem;
  }

  h1 {
    font-size: 1.5rem;
  }
}

@media (min-width: 960px) {
  header {
    padding: 1.25rem 4rem;
  }

  .class-filter {
    padding: 0.75rem 4rem;
  }

  .mastery-progress {
    padding: 0.75rem 4rem;
    max-width: 900px;
    margin: 0 auto;
  }

  .weapon-list {
    padding: 1rem 4rem;
    max-width: 900px;
    margin: 0 auto;
  }
}