/* Vampire Planes CSS Stylesheet */

:root {
  --bg-color: #05070e;
  --bg-grid: rgba(255, 255, 255, 0.015);
  
  --panel-bg: rgba(13, 17, 34, 0.55);
  --panel-border: rgba(255, 255, 255, 0.05);
  --panel-hover-border: rgba(139, 92, 246, 0.25);
  
  --text-main: #f1f5f9;
  --text-muted: #94a3b8;
  --text-dark: #475569;
  
  --purple: #8b5cf6;
  --purple-glow: rgba(139, 92, 246, 0.2);
  --blue: #3b82f6;
  --blue-glow: rgba(59, 130, 246, 0.2);
  --green: #10b981;
  --red: #ef4444;
  --gold: #fbbf24;
  
  --font-main: 'Noto Sans KR', 'Inter', sans-serif;
  --font-display: 'Outfit', sans-serif;
  --transition-smooth: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  --shadow-card: 0 12px 40px 0 rgba(0, 0, 0, 0.5);
}

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

body {
  font-family: var(--font-main);
  background-color: var(--bg-color);
  color: var(--text-main);
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
  line-height: 1.6;
}

body::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: 
    linear-gradient(var(--bg-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--bg-grid) 1px, transparent 1px);
  background-size: 40px 40px;
  z-index: -2;
  pointer-events: none;
}

.bg-glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(150px);
  z-index: -3;
  pointer-events: none;
  opacity: 0.12;
}

.bg-glow-purple {
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, #7c3aed 0%, transparent 70%);
  top: -100px;
  left: 5%;
}

.bg-glow-blue {
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, #2563eb 0%, transparent 70%);
  top: 50%;
  right: 5%;
}

/* Glassmorphism Panel */
.glass-panel {
  background: var(--panel-bg);
  border: 1px solid var(--panel-border);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-radius: 20px;
  box-shadow: var(--shadow-card);
  transition: var(--transition-smooth);
}

/* Header */
.main-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.85rem 2rem;
  position: sticky;
  top: 0;
  z-index: 100;
  margin: 1rem 1.5rem 0 1.5rem;
  border-radius: 50px;
  border: 1px solid var(--panel-border);
  background: rgba(15, 15, 26, 0.85);
  backdrop-filter: blur(20px);
}

.header-left {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.back-btn {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.08);
  color: var(--text-muted);
  text-decoration: none;
  transition: var(--transition-smooth);
}

.back-btn:hover {
  background: rgba(255, 255, 255, 0.1);
  color: var(--text-main);
  border-color: var(--text-muted);
}

.app-logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.logo-icon.text-purple {
  color: var(--purple);
}

.logo-text {
  font-family: var(--font-main);
  font-weight: 800;
  font-size: 1.15rem;
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
}

.engine-sub {
  font-size: 0.7rem;
  color: var(--text-muted);
  font-weight: 400;
}

.btn-back-dashboard {
  background: rgba(139, 92, 246, 0.1);
  border: 1px solid rgba(139, 92, 246, 0.2);
  color: var(--text-main);
  font-weight: 600;
  font-size: 0.82rem;
  padding: 0.5rem 1rem;
  border-radius: 30px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  transition: var(--transition-smooth);
}

.btn-back-dashboard:hover {
  background: var(--purple);
  box-shadow: 0 4px 12px var(--purple-glow);
}

/* Container Layout */
.game-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 3rem 1.5rem;
}

/* Lobby Page */
.lobby-panel-wrapper {
  padding: 2.5rem;
  margin-bottom: 2.5rem;
}

.lobby-header {
  text-align: center;
  margin-bottom: 2.5rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  padding-bottom: 1.5rem;
}

.lobby-title {
  font-size: 2.2rem;
  font-weight: 900;
  letter-spacing: -1px;
  background: linear-gradient(135deg, #a78bfa, #8b5cf6, #3b82f6);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.lobby-subtitle {
  color: var(--text-muted);
  font-size: 1rem;
  margin-top: 0.5rem;
}

.lobby-settings-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 3rem;
}

.settings-col {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.setting-col-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.setting-col-title i {
  color: var(--purple);
}

/* Stage List */
.stage-cards-list {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.stage-card {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  padding: 1.15rem 1.5rem;
  cursor: pointer;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(255, 255, 255, 0.04);
}

.stage-card:hover {
  border-color: rgba(255, 255, 255, 0.1);
  transform: translateX(4px);
  background: rgba(255, 255, 255, 0.04);
}

.stage-card.active {
  border-color: var(--purple);
  background: rgba(139, 92, 246, 0.08);
  box-shadow: 0 0 15px rgba(139, 92, 246, 0.15);
}

.stage-badge {
  font-family: var(--font-display);
  font-size: 0.7rem;
  font-weight: 800;
  padding: 0.25rem 0.65rem;
  border-radius: 4px;
  min-width: 70px;
  text-align: center;
  letter-spacing: 0.5px;
}

.badge-easy { background-color: rgba(16, 185, 129, 0.15); color: #34d399; border: 1px solid rgba(16, 185, 129, 0.3); }
.badge-normal { background-color: rgba(59, 130, 246, 0.15); color: #60a5fa; border: 1px solid rgba(59, 130, 246, 0.3); }
.badge-hard { background-color: rgba(251, 191, 36, 0.15); color: #fbbf24; border: 1px solid rgba(251, 191, 36, 0.3); }
.badge-veryhard { background-color: rgba(249, 115, 22, 0.15); color: #fb923c; border: 1px solid rgba(249, 115, 22, 0.3); }
.badge-chaos { background-color: rgba(239, 68, 68, 0.15); color: #f87171; border: 1px solid rgba(239, 68, 68, 0.3); }

.stage-info h4 {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 0.2rem;
  color: var(--text-main);
}

.stage-card.active h4 {
  color: #c084fc;
}

.stage-info p {
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* Time Limit Selection */
.sub-setting-box {
  display: flex;
  flex-direction: column;
}

.time-select-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
}

.btn {
  outline: none;
  font-family: var(--font-main);
  cursor: pointer;
  transition: var(--transition-smooth);
}

.btn-time {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: 10px;
  color: var(--text-muted);
  padding: 0.75rem;
  font-weight: 700;
  font-size: 0.85rem;
}

.btn-time:hover {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-main);
}

.btn-time.active {
  background: rgba(59, 130, 246, 0.1);
  border-color: var(--blue);
  color: var(--blue);
  box-shadow: 0 0 12px rgba(59, 130, 246, 0.15);
}

.bullet-select-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
}

.btn-bullet-type {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: 10px;
  color: var(--text-muted);
  padding: 0.75rem 0.2rem;
  font-weight: 700;
  font-size: 0.8rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
}

.btn-bullet-type:hover {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-main);
}

.btn-bullet-type.active {
  background: rgba(139, 92, 246, 0.12);
  border-color: var(--purple);
  color: #c084fc;
  box-shadow: 0 0 12px rgba(139, 92, 246, 0.2);
}


.scaling-info-notice {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  margin-top: 0.85rem;
  background-color: rgba(239, 68, 68, 0.06);
  border: 1px solid rgba(239, 68, 68, 0.1);
  padding: 0.75rem 1rem;
  border-radius: 10px;
  font-size: 0.78rem;
  color: #f87171;
  line-height: 1.4;
}

.scaling-info-notice i {
  margin-top: 0.15rem;
  font-size: 0.95rem;
}

.flight-controls-info {
  padding: 1.5rem;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.01);
}

.controls-desc p {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 0.5rem;
}

.controls-desc ul {
  padding-left: 1.2rem;
  font-size: 0.8rem;
  color: var(--text-muted);
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

/* Start Game Action button */
.btn-start-action {
  width: 100%;
  background: linear-gradient(135deg, #a78bfa, #8b5cf6);
  border: none;
  border-radius: 14px;
  color: #ffffff;
  font-weight: 800;
  font-size: 1.15rem;
  padding: 1.15rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  box-shadow: 0 6px 20px rgba(139, 92, 246, 0.3);
  transition: var(--transition-smooth);
}

.btn-start-action:hover {
  background: linear-gradient(135deg, #c084fc, #a78bfa);
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(139, 92, 246, 0.45);
}

/* ==========================================
   Gameplay Dashboard View
   ========================================== */
.gameplay-panel-wrapper {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.hud-dashboard {
  padding: 1.25rem 2rem;
}

.hud-main-bar-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.25rem;
  gap: 2rem;
}

.hud-item {
  display: flex;
  flex-direction: column;
}

.hud-item.flex-item {
  align-items: center;
}

.hud-item .label {
  font-size: 0.65rem;
  font-weight: 700;
  color: var(--text-dark);
  letter-spacing: 0.8px;
}

.hud-item .value {
  font-family: var(--font-display);
  font-size: 1.8rem;
  font-weight: 800;
  line-height: 1.1;
}

.hud-item .value.purple { color: #c084fc; text-shadow: 0 0 15px rgba(192, 132, 252, 0.3); }
.hud-item .value.red { color: #f87171; text-shadow: 0 0 15px rgba(248, 113, 113, 0.3); }

.btn-pause {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--panel-border);
  border-radius: 10px;
  color: var(--text-main);
  width: 42px;
  height: 42px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition-smooth);
}

.btn-pause:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--text-muted);
}

/* Exp Bar */
.exp-bar-container {
  width: 100%;
  height: 22px;
  background-color: rgba(255, 255, 255, 0.04);
  border-radius: 30px;
  overflow: hidden;
  position: relative;
  border: 1px solid rgba(255, 255, 255, 0.06);
  margin-bottom: 1.25rem;
}

.exp-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, #3b82f6, #8b5cf6, #ec4899);
  border-radius: 30px;
  width: 0%;
  transition: width 0.2s ease;
}

.exp-bar-value {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-size: 0.72rem;
  font-weight: 800;
  color: #ffffff;
  letter-spacing: 0.5px;
}

/* Health and Shield Trackers */
.health-shield-bar-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-bottom: 1.25rem;
}

.bar-col {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.bar-label {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.bar-label i {
  font-size: 0.8rem;
}

.hud-bar-track {
  width: 100%;
  height: 12px;
  background-color: rgba(255, 255, 255, 0.03);
  border-radius: 10px;
  overflow: hidden;
  border: 1px solid rgba(255,255,255,0.05);
}

.hud-bar-fill {
  height: 100%;
  border-radius: 10px;
  width: 100%;
  transition: width 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.hp-fill {
  background: linear-gradient(90deg, #b91c1c, #ef4444);
  box-shadow: 0 0 10px rgba(239, 68, 68, 0.3);
}

.shield-fill {
  background: linear-gradient(90deg, #1d4ed8, #3b82f6);
  box-shadow: 0 0 10px rgba(59, 130, 246, 0.3);
}

/* Slots indicators */
.slots-dashboard-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  border-top: 1px solid rgba(255, 255, 255, 0.04);
  padding-top: 1rem;
}

.slots-col {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.slots-title {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-dark);
  white-space: nowrap;
}

.slots-list {
  display: flex;
  gap: 0.5rem;
}

.slot-icon-badge {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background-color: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.08);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  color: var(--text-muted);
  position: relative;
  transition: var(--transition-smooth);
}

.slot-icon-badge.occupied {
  background-color: rgba(139, 92, 246, 0.1);
  border-color: rgba(139, 92, 246, 0.3);
  color: #c084fc;
  box-shadow: 0 0 8px rgba(139, 92, 246, 0.15);
}

.slot-icon-badge.occupied-passive {
  background-color: rgba(59, 130, 246, 0.1);
  border-color: rgba(59, 130, 246, 0.3);
  color: #60a5fa;
  box-shadow: 0 0 8px rgba(59, 130, 246, 0.15);
}

.slot-level-indicator {
  position: absolute;
  bottom: -2px;
  right: -2px;
  background-color: #05070e;
  border: 1px solid rgba(255,255,255,0.15);
  font-family: var(--font-display);
  font-size: 0.55rem;
  font-weight: 800;
  color: #ffffff;
  padding: 0 4px;
  border-radius: 4px;
  line-height: 1;
}

/* ==========================================
   Play Workspace & Canvas Box
   ========================================== */
.game-workspace-layout {
  display: grid;
  grid-template-columns: 1fr;
  justify-items: center;
  gap: 1.5rem;
}

.canvas-screen-panel {
  padding: 0.6rem;
  border-radius: 24px;
  overflow: hidden;
}

.game-canvas-relative-wrapper {
  position: relative;
  background-color: #07080f;
  border-radius: 18px;
  overflow: hidden;
  box-shadow: inset 0 0 30px rgba(0, 0, 0, 0.9);
}

#game-canvas {
  display: block;
}

/* Alerts drop banner */
.game-alert-banner {
  position: absolute;
  top: 1.5rem;
  left: 50%;
  transform: translateX(-50%);
  background-color: rgba(239, 68, 68, 0.95);
  backdrop-filter: blur(10px);
  border: 1px solid #ef4444;
  border-radius: 8px;
  padding: 0.6rem 1.25rem;
  color: #ffffff;
  box-shadow: 0 10px 30px rgba(239, 68, 68, 0.4);
  z-index: 5;
  animation: slideDownFade 0.4s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes slideDownFade {
  from { top: -2rem; opacity: 0; }
  to { top: 1.5rem; opacity: 1; }
}

.alert-content {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: -0.2px;
}

.alert-content i {
  font-size: 0.95rem;
}

/* Overlay & modal displays */
.game-overlay-container {
  position: absolute;
  inset: 0;
  background-color: rgba(6, 8, 18, 0.8);
  backdrop-filter: blur(6px);
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: center;
}

.overlay-modal {
  width: 85%;
  max-width: 420px;
  padding: 2.25rem;
  text-align: center;
  animation: scaleUpOverlay 0.4s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes scaleUpOverlay {
  from { transform: scale(0.9); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}

.overlay-title {
  font-size: 1.75rem;
  font-weight: 900;
  margin-bottom: 0.75rem;
  color: #ffffff;
}

.overlay-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 2rem;
  line-height: 1.5;
}

.overlay-btn-row {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.btn-large {
  padding: 0.95rem 1.5rem;
  font-size: 0.95rem;
}

.btn-primary {
  background-color: var(--purple);
  border: none;
  color: #ffffff;
  font-weight: 800;
  border-radius: 8px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  transition: var(--transition-smooth);
}

.btn-primary:hover {
  background-color: #7c3aed;
  box-shadow: 0 4px 12px var(--purple-glow);
}

.btn-secondary {
  background-color: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--panel-border);
  color: var(--text-main);
  font-weight: 700;
  border-radius: 8px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  transition: var(--transition-smooth);
}

.btn-secondary:hover {
  background-color: rgba(255,255,255,0.1);
}

/* Levelup modal styling */
.levelup-modal {
  width: 90%;
  max-width: 580px;
  padding: 2.25rem 1.85rem;
  text-align: center;
  animation: scaleUpOverlay 0.4s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.levelup-header {
  margin-bottom: 1.75rem;
}

.pulse-icon {
  font-size: 2.5rem;
  margin-bottom: 0.5rem;
  animation: floatPulse 2s infinite ease-in-out;
}

@keyframes floatPulse {
  0% { transform: translateY(0) scale(1); filter: drop-shadow(0 0 2px rgba(139,92,246,0.3)); }
  50% { transform: translateY(-4px) scale(1.08); filter: drop-shadow(0 0 12px rgba(139,92,246,0.6)); }
  100% { transform: translateY(0) scale(1); filter: drop-shadow(0 0 2px rgba(139,92,246,0.3)); }
}

.levelup-header h2 {
  font-size: 1.5rem;
  font-weight: 900;
  color: #c084fc;
}

.levelup-header p {
  font-size: 0.82rem;
  color: var(--text-muted);
}

.upgrade-cards-container {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.upgrade-card {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  padding: 1rem 1.5rem;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: 12px;
  cursor: pointer;
  text-align: left;
  transition: var(--transition-smooth);
}

.upgrade-card:hover {
  background: rgba(139, 92, 246, 0.08);
  border-color: var(--purple);
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(139, 92, 246, 0.15);
}

.upgrade-card-icon {
  width: 48px;
  height: 48px;
  border-radius: 10px;
  background-color: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.08);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  color: var(--text-muted);
}

.upgrade-card:hover .upgrade-card-icon {
  background-color: rgba(139, 92, 246, 0.15);
  border-color: rgba(139, 92, 246, 0.3);
  color: #c084fc;
}

.upgrade-card-info {
  flex-grow: 1;
}

.upgrade-card-title-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 0.15rem;
}

.upgrade-card-title-row h4 {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--text-main);
}

.upgrade-card:hover .upgrade-card-title-row h4 {
  color: #c084fc;
}

.upgrade-type-badge {
  font-size: 0.65rem;
  font-weight: 700;
  color: var(--text-muted);
}

.upgrade-card-desc {
  font-size: 0.75rem;
  color: var(--text-muted);
  line-height: 1.35;
}

.upgrade-card:hover .upgrade-card-desc {
  color: var(--text-main);
}

/* Mobile Handheld Steering */
.mobile-controller-panel {
  display: none;
  width: 100%;
  max-width: 480px;
  padding: 1rem;
  text-align: center;
}

.mobile-pad-title {
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--text-dark);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.touch-control-joystick-area {
  background-color: rgba(255,255,255,0.01);
  border: 1px dashed rgba(255,255,255,0.08);
  height: 100px;
  border-radius: 12px;
  margin-top: 0.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  cursor: pointer;
  user-select: none;
}

.touch-joystick-inner {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  color: var(--text-muted);
  font-size: 0.85rem;
  font-weight: 600;
  pointer-events: none;
}

.touch-joystick-inner i {
  font-size: 1.1rem;
  animation: bounceSteer 1.5s infinite ease-in-out;
}

@keyframes bounceSteer {
  0%, 100% { transform: translateX(0); }
  50% { transform: translateX(3px); }
}

/* ==========================================
   Bottom Guide Encyclopedia
   ========================================== */
.explanation-board-section {
  margin-top: 4rem;
}

.board-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.75rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  padding-bottom: 0.75rem;
}

.board-header i {
  font-size: 1.75rem;
}

.board-header h2 {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-main);
}

.board-header span {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.explanation-layout {
  display: grid;
  grid-template-columns: 0.7fr 1.3fr;
  gap: 2rem;
}

.explanation-index-list ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.explanation-index-list li {
  padding: 0.9rem 1.25rem;
  background-color: rgba(255, 255, 255, 0.01);
  border: 1px solid rgba(255,255,255,0.03);
  border-radius: 10px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.85rem;
  transition: var(--transition-smooth);
}

.explanation-index-list li:hover {
  background-color: rgba(255, 255, 255, 0.03);
  color: var(--text-main);
  transform: translateX(4px);
}

.explanation-index-list li.active {
  background-color: rgba(139, 92, 246, 0.08);
  border-color: rgba(139, 92, 246, 0.3);
  color: #c084fc;
}

.index-num {
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 800;
  color: var(--text-dark);
}

.explanation-index-list li.active .index-num {
  color: #c084fc;
}

.explanation-display-box {
  padding: 2.25rem;
  min-height: 380px;
}

.display-top-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  background-color: rgba(139,92,246,0.1);
  color: #c084fc;
  border-radius: 4px;
  padding: 0.2rem 0.55rem;
  font-size: 0.65rem;
  font-weight: 800;
  margin-bottom: 1rem;
}

#explanation-display-title {
  font-size: 1.3rem;
  font-weight: 800;
  margin-bottom: 1.25rem;
  color: var(--text-main);
  border-left: 3px solid var(--purple);
  padding-left: 0.75rem;
}

.display-text-body {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.65;
}

.display-text-body h4 {
  font-size: 0.95rem;
  font-weight: 700;
  margin-top: 1.5rem;
  margin-bottom: 0.5rem;
  color: var(--text-main);
}

.display-text-body ul {
  padding-left: 1.25rem;
  margin-top: 0.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.display-text-body p {
  margin-bottom: 0.85rem;
}

/* Floating Actions panel */
.floating-panel {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 90;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.float-btn {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background-color: rgba(13, 17, 34, 0.85);
  border: 1px solid var(--panel-border);
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: var(--shadow-card);
  transition: var(--transition-smooth);
}

.float-btn:hover {
  background-color: var(--purple);
  color: #ffffff;
  border-color: var(--purple);
  transform: translateY(-2px);
}

/* Footer styling */
.main-footer {
  padding: 3rem 1.5rem;
  text-align: center;
  border-top: 1px solid var(--panel-border);
  color: var(--text-dark);
  font-size: 0.8rem;
  margin-top: 5rem;
}

/* Responsive adjustment */
@media (max-width: 1024px) {
  .lobby-settings-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }
  .explanation-layout {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
}

@media (max-width: 768px) {
  .main-header {
    margin: 1rem;
    padding: 0.85rem 1.25rem;
    flex-direction: column;
    align-items: stretch;
    border-radius: 20px;
    gap: 1rem;
  }
  .lobby-panel-wrapper {
    padding: 1.5rem;
  }
  .lobby-title {
    font-size: 1.8rem;
  }
  .hud-main-bar-row {
    flex-wrap: wrap;
    gap: 1rem;
  }
  .health-shield-bar-row {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
  .slots-dashboard-row {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
  .mobile-controller-panel {
    display: block;
  }
}


/* ==========================================================================
   Antigravity Unified Header Styles
   ========================================================================== */
.main-header {
  display: flex !important;
  align-items: center !important;
  justify-content: space-between !important;
  padding: 0.85rem 2rem !important;
  position: sticky !important;
  top: 0 !important;
  z-index: 100 !important;
  margin: 1rem 1.5rem 0 1.5rem !important;
  border-radius: 50px !important;
  border: 1px solid rgba(255, 255, 255, 0.05) !important;
  background: rgba(15, 15, 26, 0.85) !important;
  backdrop-filter: blur(20px) !important;
  -webkit-backdrop-filter: blur(20px) !important;
}

.header-left {
  display: flex !important;
  align-items: center !important;
  gap: 0.75rem !important;
}

.back-btn {
  width: 36px !important;
  height: 36px !important;
  border-radius: 10px !important;
  display: flex !important;
  align-items: center !important;
  justify-content: center !important;
  background: rgba(255, 255, 255, 0.05) !important;
  border: 1px solid rgba(255, 255, 255, 0.08) !important;
  color: #94a3b8 !important;
  text-decoration: none !important;
  transition: all 0.3s ease !important;
}

.back-btn:hover {
  background: rgba(255, 255, 255, 0.1) !important;
  color: #f1f5f9 !important;
  border-color: #94a3b8 !important;
}

.app-logo {
  display: flex !important;
  align-items: center !important;
  gap: 0.5rem !important;
}

.app-logo i.logo-icon {
  font-size: 1.15rem !important;
}

.app-logo i.logo-icon.text-purple { color: #a78bfa !important; }
.app-logo i.logo-icon.text-blue { color: #60a5fa !important; }
.app-logo i.logo-icon.text-red { color: #f87171 !important; }
.app-logo i.logo-icon.text-green { color: #34d399 !important; }
.app-logo i.logo-icon.text-orange { color: #fb923c !important; }
.app-logo i.logo-icon.text-cyan { color: #22d3ee !important; }
.app-logo i.logo-icon.text-gold { color: #fbbf24 !important; }

.logo-text {
  font-family: inherit !important;
  font-weight: 800 !important;
  font-size: 1.15rem !important;
  display: flex !important;
  align-items: baseline !important;
  gap: 0.5rem !important;
  color: #f1f5f9 !important;
  margin: 0 !important;
  padding: 0 !important;
  border: none !important;
}

.engine-sub {
  font-size: 0.7rem !important;
  color: #94a3b8 !important;
  font-weight: 400 !important;
}

.btn-back-dashboard {
  background: rgba(168, 85, 247, 0.1) !important;
  border: 1px solid rgba(168, 85, 247, 0.2) !important;
  color: #f1f5f9 !important;
  font-weight: 600 !important;
  font-size: 0.82rem !important;
  padding: 0.5rem 1.25rem !important;
  border-radius: 30px !important;
  cursor: pointer !important;
  display: flex !important;
  align-items: center !important;
  gap: 0.4rem !important;
  transition: all 0.3s ease !important;
}

.btn-back-dashboard:hover {
  background: #a855f7 !important;
  box-shadow: 0 4px 12px rgba(168, 85, 247, 0.3) !important;
}