:root {
  --font-main: 'Inter', system-ui, -apple-system, sans-serif;
  --bg-dark: #0f1218;
  --accent-gold: #de9b35;
  --accent-blue: #00b0ff;
  --rarity-covert: #eb4b4b;
  --rarity-classified: #d32ce6;
  --rarity-restricted: #8847ff;
  --rarity-mil-spec: #4b69ff;
  --rarity-special: #ffd700;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  user-select: none;
  -webkit-user-select: none;
}

body, html {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: #000;
  font-family: var(--font-main);
  color: #fff;
}

#canvas-container {
  width: 100%;
  height: 100%;
  position: absolute;
  top: 0;
  left: 0;
  z-index: 1;
}

/* Crosshair */
#crosshair {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 24px;
  height: 24px;
  pointer-events: none;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: center;
}

#crosshair::before,
#crosshair::after {
  content: '';
  position: absolute;
  background: rgba(0, 255, 136, 0.9);
  box-shadow: 0 0 4px rgba(0, 0, 0, 0.8);
}

#crosshair::before {
  width: 2px;
  height: 14px;
}

#crosshair::after {
  width: 14px;
  height: 2px;
}

#crosshair.hit {
  transform: translate(-50%, -50%) scale(1.4);
  transition: transform 0.05s ease-out;
}

#crosshair.hit::before,
#crosshair.hit::after {
  background: #ff3333;
}

/* CS2 Sniper Scope Overlay (Chuột phải súng ngắm) */
#sniper-scope {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 15;
  display: flex;
  align-items: center;
  justify-content: center;
}

#sniper-scope.hidden {
  display: none !important;
}

.scope-ring {
  position: relative;
  width: min(80vh, 80vw);
  height: min(80vh, 80vw);
  border-radius: 50%;
  border: 4px solid #000;
  box-shadow: inset 0 0 60px rgba(0, 0, 0, 0.96), 0 0 0 3500px #000;
  overflow: hidden;
}

.scope-lens-tint {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(circle, rgba(18, 52, 42, 0.04) 40%, rgba(10, 24, 20, 0.22) 80%, rgba(0, 0, 0, 0.65) 100%);
  pointer-events: none;
}

.scope-crosshair-h {
  position: absolute;
  top: 50%;
  left: 0;
  width: 100%;
  height: 1px;
  background: #000;
  transform: translateY(-50%);
  box-shadow: 0 0 1px rgba(0,0,0,0.8);
}

.scope-crosshair-v {
  position: absolute;
  top: 0;
  left: 50%;
  width: 1px;
  height: 100%;
  background: #000;
  transform: translateX(-50%);
  box-shadow: 0 0 1px rgba(0,0,0,0.8);
}

.scope-center-dot {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 3px;
  height: 3px;
  background: #ff2222;
  border-radius: 50%;
  transform: translate(-50%, -50%);
  box-shadow: 0 0 4px #ff0000;
}

.scope-mil-ticks-h {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 320px;
  height: 12px;
  transform: translate(-50%, -50%);
  background-image: repeating-linear-gradient(to right, #000 0, #000 1px, transparent 1px, transparent 32px);
  opacity: 0.85;
}

.scope-mil-ticks-v {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 12px;
  height: 320px;
  transform: translate(-50%, -50%);
  background-image: repeating-linear-gradient(to bottom, #000 0, #000 1px, transparent 1px, transparent 32px);
  opacity: 0.85;
}

.scope-bracket-tl, .scope-bracket-tr, .scope-bracket-bl, .scope-bracket-br {
  position: absolute;
  width: 36px;
  height: 36px;
  border-color: rgba(0, 0, 0, 0.65);
  border-style: solid;
}
.scope-bracket-tl { top: 22%; left: 22%; border-width: 2px 0 0 2px; }
.scope-bracket-tr { top: 22%; right: 22%; border-width: 2px 2px 0 0; }
.scope-bracket-bl { bottom: 22%; left: 22%; border-width: 0 0 2px 2px; }
.scope-bracket-br { bottom: 22%; right: 22%; border-width: 0 2px 2px 0; }

.scope-lens-glare {
  position: absolute;
  top: -30%;
  left: -30%;
  width: 160%;
  height: 160%;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.08) 0%, transparent 40%, rgba(0, 255, 200, 0.03) 60%, transparent 100%);
  pointer-events: none;
}

/* Hitmarker text */
#hit-indicator {
  position: absolute;
  top: 45%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 1.1rem;
  font-weight: 800;
  color: #ff3333;
  text-shadow: 0 2px 8px rgba(0,0,0,0.9);
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.15s, transform 0.15s;
  z-index: 11;
}

#hit-indicator.show {
  opacity: 1;
  transform: translate(-50%, -70%);
}

/* HUD elements */
.hud {
  position: absolute;
  z-index: 10;
  pointer-events: none;
}

/* Top bar: Score, Timer, Back */
.hud-top {
  top: 20px;
  left: 24px;
  right: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.hud-user-info {
  display: flex;
  align-items: center;
  gap: 12px;
  background: rgba(15, 18, 24, 0.75);
  backdrop-filter: blur(10px);
  padding: 8px 18px;
  border-radius: 30px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 0.95rem;
}

.stats-card {
  display: flex;
  gap: 20px;
  background: rgba(15, 18, 24, 0.75);
  backdrop-filter: blur(10px);
  padding: 8px 24px;
  border-radius: 30px;
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.stat-label {
  font-size: 0.7rem;
  text-transform: uppercase;
  color: #8fa0b5;
  letter-spacing: 1px;
}

.stat-val {
  font-size: 1.15rem;
  font-weight: 800;
  color: #fff;
}

.btn-interactive {
  pointer-events: auto;
  cursor: pointer;
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: #fff;
  padding: 8px 16px;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 600;
  transition: all 0.2s;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.btn-interactive:hover {
  background: rgba(255, 255, 255, 0.25);
  transform: translateY(-2px);
}

/* Bottom HUD */
.hud-bottom-left {
  bottom: 24px;
  left: 24px;
  display: flex;
  align-items: flex-end;
  gap: 16px;
}

.health-box {
  background: rgba(15, 18, 24, 0.85);
  backdrop-filter: blur(10px);
  padding: 12px 24px;
  border-radius: 12px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.health-val {
  font-size: 2.4rem;
  font-weight: 900;
  color: #00ff88;
  text-shadow: 0 0 10px rgba(0, 255, 136, 0.4);
}

.health-lbl {
  font-size: 0.85rem;
  text-transform: uppercase;
  font-weight: 700;
  color: #8fa0b5;
}

.hud-bottom-right {
  bottom: 24px;
  right: 24px;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 10px;
}

/* Weapon Slots Bar (1, 2, 3) */
.weapon-slots-bar {
  display: flex;
  gap: 8px;
  margin-bottom: 6px;
}

.slot-item {
  background: rgba(15, 18, 24, 0.75);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 8px;
  padding: 4px 10px;
  font-size: 0.78rem;
  font-weight: 700;
  color: #8fa0b5;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: all 0.2s ease;
}

.slot-item.active {
  background: rgba(222, 155, 53, 0.25);
  border-color: var(--accent-gold);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 0 12px rgba(222, 155, 53, 0.35);
}

.slot-key {
  background: rgba(255, 255, 255, 0.15);
  padding: 1px 5px;
  border-radius: 4px;
  font-size: 0.7rem;
}

.slot-item.active .slot-key {
  background: var(--accent-gold);
  color: #111;
}

.weapon-banner {
  background: rgba(15, 18, 24, 0.85);
  backdrop-filter: blur(10px);
  padding: 10px 20px;
  border-radius: 12px;
  border-left: 5px solid var(--rarity-covert);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  border-right: 1px solid rgba(255, 255, 255, 0.1);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  text-align: right;
  min-width: 220px;
}

.wpn-name {
  font-size: 1.15rem;
  font-weight: 800;
  color: #fff;
}

.wpn-skin {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--accent-gold);
}

.ammo-box {
  display: flex;
  align-items: baseline;
  gap: 6px;
  background: rgba(15, 18, 24, 0.85);
  backdrop-filter: blur(10px);
  padding: 10px 24px;
  border-radius: 12px;
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.ammo-cur {
  font-size: 2.5rem;
  font-weight: 900;
  color: #fff;
}

.ammo-slash {
  font-size: 1.5rem;
  color: #666;
}

.ammo-max {
  font-size: 1.3rem;
  font-weight: 700;
  color: #8fa0b5;
}

/* Hints bar */
.hud-hints {
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 16px;
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.6);
  background: rgba(0, 0, 0, 0.5);
  padding: 6px 18px;
  border-radius: 20px;
}

.hint-key {
  background: rgba(255, 255, 255, 0.2);
  color: #fff;
  font-weight: 700;
  padding: 2px 6px;
  border-radius: 4px;
  margin-right: 4px;
}

/* Modals & Screens */
.screen-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(8, 10, 15, 0.85);
  backdrop-filter: blur(8px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 100;
  pointer-events: auto;
}

.screen-overlay.hidden {
  display: none;
}

.menu-card {
  background: #151a23;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 18px;
  padding: 36px 48px;
  text-align: center;
  max-width: 520px;
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.8);
}

.menu-title {
  font-size: 2rem;
  font-weight: 900;
  letter-spacing: 1px;
  margin-bottom: 8px;
  background: linear-gradient(135deg, #fff, #de9b35);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.menu-desc {
  font-size: 0.95rem;
  color: #8fa0b5;
  margin-bottom: 24px;
  line-height: 1.5;
}

.controls-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-bottom: 28px;
  text-align: left;
  background: rgba(0, 0, 0, 0.25);
  padding: 16px;
  border-radius: 12px;
  font-size: 0.85rem;
}

.ctrl-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

.btn-primary {
  background: linear-gradient(135deg, #de9b35, #c87c1c);
  color: #fff;
  border: none;
  font-size: 1.1rem;
  font-weight: 800;
  padding: 14px 36px;
  border-radius: 12px;
  cursor: pointer;
  transition: all 0.2s;
  box-shadow: 0 6px 20px rgba(222, 155, 53, 0.35);
  width: 100%;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(222, 155, 53, 0.5);
}

/* Skin Selector Drawer */
#skin-drawer {
  position: absolute;
  top: 0;
  right: 0;
  width: 380px;
  height: 100%;
  background: #11151e;
  border-left: 1px solid rgba(255, 255, 255, 0.12);
  z-index: 105;
  display: flex;
  flex-direction: column;
  transform: translateX(100%);
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  pointer-events: auto;
}

#skin-drawer.open {
  transform: translateX(0);
}

.drawer-header {
  padding: 16px 20px 12px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.drawer-tabs {
  display: flex;
  padding: 0 16px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(0, 0, 0, 0.2);
}

.tab-btn {
  flex: 1;
  background: none;
  border: none;
  color: #8fa0b5;
  font-size: 0.8rem;
  font-weight: 700;
  padding: 10px 4px;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: all 0.2s;
  text-align: center;
}

.tab-btn:hover {
  color: #fff;
}

.tab-btn.active {
  color: var(--accent-gold);
  border-bottom-color: var(--accent-gold);
}

.drawer-title {
  font-size: 1.2rem;
  font-weight: 800;
}

.drawer-close {
  background: none;
  border: none;
  color: #8fa0b5;
  font-size: 1.5rem;
  cursor: pointer;
}

.drawer-body {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.skin-item {
  display: flex;
  align-items: center;
  gap: 12px;
  background: #181e2b;
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: 10px;
  padding: 10px;
  cursor: pointer;
  transition: all 0.2s;
}

.skin-item:hover {
  background: #202737;
  border-color: rgba(255, 255, 255, 0.2);
  transform: translateX(-4px);
}

.skin-item.equipped {
  border-color: var(--accent-gold);
  background: rgba(222, 155, 53, 0.1);
}

.skin-thumb {
  width: 64px;
  height: 48px;
  object-fit: contain;
  background: rgba(0, 0, 0, 0.3);
  border-radius: 6px;
  padding: 4px;
}

.skin-details {
  flex: 1;
  overflow: hidden;
}

.skin-wpn {
  font-size: 0.8rem;
  color: #8fa0b5;
  font-weight: 600;
}

.skin-lbl {
  font-size: 0.95rem;
  font-weight: 700;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.skin-badge {
  font-size: 0.75rem;
  padding: 3px 8px;
  border-radius: 6px;
  background: rgba(222, 155, 53, 0.2);
  color: var(--accent-gold);
  font-weight: 700;
}

/* Inspect Card Overlay (Phím F) */
.inspect-card {
  position: absolute;
  top: 90px;
  left: 28px;
  background: rgba(18, 22, 32, 0.94);
  backdrop-filter: blur(14px);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-left: 6px solid var(--accent-gold);
  border-radius: 14px;
  padding: 16px;
  width: 320px;
  z-index: 50;
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.8);
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  pointer-events: none;
  opacity: 1;
  transform: translateY(0);
}

.inspect-card.hidden {
  opacity: 0;
  transform: translateY(-20px);
  pointer-events: none;
}

.inspect-badge {
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 1px;
  color: var(--accent-gold);
  margin-bottom: 10px;
}

.inspect-img-wrap {
  width: 100%;
  height: 160px;
  background: radial-gradient(circle at center, rgba(255, 255, 255, 0.08) 0%, rgba(0, 0, 0, 0.4) 80%);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 12px;
  overflow: hidden;
}

.inspect-img-wrap img {
  max-width: 90%;
  max-height: 90%;
  object-fit: contain;
  filter: drop-shadow(0 8px 16px rgba(0, 0, 0, 0.6));
}

.inspect-info h3 {
  font-size: 1.15rem;
  font-weight: 800;
  margin-bottom: 4px;
}

.inspect-info p {
  font-size: 0.85rem;
  color: #8fa0b5;
  margin-bottom: 12px;
}

.inspect-details {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.badge-rarity {
  font-size: 0.75rem;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 6px;
  background: rgba(235, 75, 75, 0.2);
  color: #eb4b4b;
}

.badge-price {
  font-size: 1.15rem;
  font-weight: 800;
  color: #00ff88;
}