/* DP Quest - Strategic Algorithms Game
   Theme: Cyberpunk Terminal with Phosphor Accents */

:root {
    /* Core Palette - Deep blacks with phosphor green and electric amber */
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-tertiary: #1a1a25;
    --bg-card: #15151f;
    
    /* Phosphor Accents */
    --phosphor-green: #39ff14;
    --phosphor-green-dim: #1a7a0a;
    --phosphor-green-glow: rgba(57, 255, 20, 0.3);
    
    /* Electric Amber */
    --amber: #ffb000;
    --amber-dim: #8a5f00;
    --amber-glow: rgba(255, 176, 0, 0.3);
    
    /* Danger/Health */
    --crimson: #ff3366;
    --crimson-dim: #8a1a36;
    --crimson-glow: rgba(255, 51, 102, 0.3);
    
    /* Cool Accent */
    --cyan: #00f5ff;
    --cyan-dim: #007a80;
    --cyan-glow: rgba(0, 245, 255, 0.3);
    
    /* Text */
    --text-primary: #e8e8f0;
    --text-secondary: #9898a8;
    --text-dim: #585868;
    
    /* Grid lines */
    --grid-line: rgba(57, 255, 20, 0.05);
    --grid-line-bright: rgba(57, 255, 20, 0.15);
    
    /* Fonts */
    --font-display: 'Orbitron', monospace;
    --font-body: 'Rajdhani', sans-serif;
    
    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    
    /* Borders */
    --border-thin: 1px solid rgba(57, 255, 20, 0.2);
    --border-glow: 1px solid var(--phosphor-green);
    
    /* Shadows */
    --shadow-glow: 0 0 20px var(--phosphor-green-glow);
    --shadow-amber: 0 0 20px var(--amber-glow);
    --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.5);
}

/* Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

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

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

/* Background Effects */
.game-container {
    position: relative;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.bg-grid {
    position: fixed;
    inset: 0;
    background-image: 
        linear-gradient(var(--grid-line) 1px, transparent 1px),
        linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
    background-size: 40px 40px;
    pointer-events: none;
    z-index: 0;
}

.bg-particles {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
}

.particle {
    position: absolute;
    width: 2px;
    height: 2px;
    background: var(--phosphor-green);
    border-radius: 50%;
    opacity: 0.5;
    animation: float 20s infinite linear;
}

@keyframes float {
    0% { transform: translateY(100vh) translateX(0); opacity: 0; }
    10% { opacity: 0.5; }
    90% { opacity: 0.5; }
    100% { transform: translateY(-100vh) translateX(100px); opacity: 0; }
}

/* Header */
.game-header {
    position: sticky;
    top: 0;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-md) var(--space-xl);
    background: linear-gradient(180deg, var(--bg-secondary) 0%, rgba(18, 18, 26, 0.9) 100%);
    backdrop-filter: blur(10px);
    border-bottom: var(--border-thin);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.logo-icon {
    font-size: 2rem;
    filter: drop-shadow(0 0 10px var(--phosphor-green));
    animation: pulse-glow 2s ease-in-out infinite;
}

@keyframes pulse-glow {
    0%, 100% { filter: drop-shadow(0 0 10px var(--phosphor-green)); }
    50% { filter: drop-shadow(0 0 20px var(--phosphor-green)); }
}

.logo h1 {
    font-family: var(--font-display);
    font-size: 1.75rem;
    font-weight: 900;
    letter-spacing: 0.1em;
    color: var(--text-primary);
}

.logo .accent {
    color: var(--phosphor-green);
    text-shadow: 0 0 10px var(--phosphor-green-glow);
}

/* Navigation */
.game-nav {
    display: flex;
    gap: var(--space-xs);
}

.nav-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-sm) var(--space-md);
    background: transparent;
    border: var(--border-thin);
    border-radius: 8px;
    color: var(--text-secondary);
    font-family: var(--font-body);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    cursor: pointer;
    transition: all 0.3s ease;
}

.nav-btn .nav-icon {
    font-size: 1.25rem;
}

.nav-btn:hover {
    background: rgba(57, 255, 20, 0.1);
    border-color: var(--phosphor-green-dim);
    color: var(--text-primary);
}

.nav-btn.active {
    background: linear-gradient(135deg, rgba(57, 255, 20, 0.2) 0%, rgba(57, 255, 20, 0.05) 100%);
    border-color: var(--phosphor-green);
    color: var(--phosphor-green);
    box-shadow: var(--shadow-glow);
}

/* Stats Bar */
.stats-bar {
    display: flex;
    gap: var(--space-lg);
}

.stat {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--space-sm) var(--space-md);
    background: var(--bg-tertiary);
    border-radius: 8px;
    border: var(--border-thin);
}

.stat-label {
    font-size: 0.7rem;
    color: var(--text-dim);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.stat-value {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--amber);
    text-shadow: 0 0 10px var(--amber-glow);
}

/* Main Content */
.game-main {
    flex: 1;
    padding: var(--space-xl);
    position: relative;
    z-index: 1;
}

/* Screen Management */
.game-screen {
    display: none;
    animation: fadeIn 0.5s ease;
}

.game-screen.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Menu Screen */
.menu-hero {
    text-align: center;
    margin-bottom: var(--space-2xl);
    padding: var(--space-2xl);
}

.hero-title {
    font-family: var(--font-display);
    font-size: 3rem;
    font-weight: 900;
    letter-spacing: 0.05em;
    line-height: 1.2;
    margin-bottom: var(--space-md);
}

.gradient-text {
    background: linear-gradient(135deg, var(--phosphor-green) 0%, var(--cyan) 50%, var(--amber) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    letter-spacing: 0.2em;
    text-transform: uppercase;
}

/* Game Mode Cards */
.game-modes {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-lg);
    margin-bottom: var(--space-2xl);
}

.mode-card {
    position: relative;
    padding: var(--space-xl);
    background: var(--bg-card);
    border: var(--border-thin);
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.4s ease;
    overflow: hidden;
}

.mode-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, var(--phosphor-green), var(--cyan));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.4s ease;
}

.mode-card:hover {
    transform: translateY(-5px);
    border-color: var(--phosphor-green-dim);
    box-shadow: var(--shadow-glow);
}

.mode-card:hover::before {
    transform: scaleX(1);
}

.mode-icon {
    font-size: 3rem;
    margin-bottom: var(--space-md);
    filter: drop-shadow(0 0 10px rgba(255, 255, 255, 0.2));
}

.mode-card h3 {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: var(--space-sm);
    color: var(--text-primary);
}

.mode-card p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-md);
    line-height: 1.5;
}

.mode-difficulty {
    display: flex;
    gap: var(--space-xs);
    margin-bottom: var(--space-sm);
}

.difficulty-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--phosphor-green);
    box-shadow: 0 0 8px var(--phosphor-green-glow);
}

.difficulty-dot.dim {
    background: var(--bg-tertiary);
    box-shadow: none;
}

.mode-tag {
    display: inline-block;
    padding: var(--space-xs) var(--space-sm);
    background: rgba(57, 255, 20, 0.1);
    border: 1px solid var(--phosphor-green-dim);
    border-radius: 4px;
    font-size: 0.7rem;
    color: var(--phosphor-green);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

/* Concept Cards */
.dp-concepts {
    margin-top: var(--space-2xl);
}

.dp-concepts h3 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    text-align: center;
    margin-bottom: var(--space-lg);
    color: var(--text-primary);
}

.concept-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: var(--space-md);
}

.concept-card {
    padding: var(--space-lg);
    background: var(--bg-secondary);
    border: var(--border-thin);
    border-radius: 8px;
    text-align: center;
    transition: all 0.3s ease;
}

.concept-card:hover {
    border-color: var(--amber-dim);
    box-shadow: var(--shadow-amber);
}

.concept-icon {
    font-size: 2rem;
    display: block;
    margin-bottom: var(--space-sm);
}

.concept-card h4 {
    font-family: var(--font-display);
    font-size: 0.9rem;
    color: var(--amber);
    margin-bottom: var(--space-xs);
}

.concept-card p {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* Screen Header */
.screen-header {
    text-align: center;
    margin-bottom: var(--space-xl);
}

.screen-header h2 {
    font-family: var(--font-display);
    font-size: 2rem;
    margin-bottom: var(--space-sm);
}

.screen-header p {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* Controls Panel */
.controls-panel {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-lg);
    align-items: flex-end;
    padding: var(--space-lg);
    background: var(--bg-card);
    border: var(--border-thin);
    border-radius: 12px;
    margin-bottom: var(--space-lg);
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    min-width: 150px;
}

.control-group label {
    font-size: 0.8rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.control-group input[type="range"] {
    -webkit-appearance: none;
    width: 150px;
    height: 6px;
    background: var(--bg-tertiary);
    border-radius: 3px;
    outline: none;
}

.control-group input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 18px;
    height: 18px;
    background: var(--phosphor-green);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 0 10px var(--phosphor-green-glow);
}

.control-group select {
    padding: var(--space-sm) var(--space-md);
    background: var(--bg-tertiary);
    border: var(--border-thin);
    border-radius: 6px;
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 0.9rem;
    cursor: pointer;
}

.control-group select:focus {
    outline: none;
    border-color: var(--phosphor-green);
}

.control-buttons {
    display: flex;
    gap: var(--space-sm);
    margin-left: auto;
}

/* Buttons */
.btn {
    padding: var(--space-sm) var(--space-lg);
    border: none;
    border-radius: 6px;
    font-family: var(--font-display);
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
}

.btn-primary {
    background: linear-gradient(135deg, var(--phosphor-green) 0%, var(--phosphor-green-dim) 100%);
    color: var(--bg-primary);
    box-shadow: 0 4px 15px var(--phosphor-green-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 25px var(--phosphor-green-glow);
}

.btn-accent {
    background: linear-gradient(135deg, var(--amber) 0%, var(--amber-dim) 100%);
    color: var(--bg-primary);
    box-shadow: 0 4px 15px var(--amber-glow);
}

.btn-accent:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 25px var(--amber-glow);
}

.btn-secondary {
    background: transparent;
    color: var(--text-primary);
    border: var(--border-glow);
}

.btn-secondary:hover {
    background: rgba(57, 255, 20, 0.1);
}

/* Game Area */
.game-area {
    padding: var(--space-lg);
    background: var(--bg-card);
    border: var(--border-thin);
    border-radius: 12px;
    margin-bottom: var(--space-lg);
}

/* Grid Container (Pathfinder) */
.grid-container {
    display: grid;
    gap: 2px;
    margin: 0 auto var(--space-lg);
    padding: var(--space-md);
    background: var(--bg-secondary);
    border-radius: 8px;
    width: fit-content;
}

.grid-cell {
    width: 50px;
    height: 50px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: var(--bg-tertiary);
    border: 1px solid rgba(57, 255, 20, 0.1);
    border-radius: 4px;
    font-family: var(--font-display);
    font-size: 0.8rem;
    color: var(--text-primary);
    transition: all 0.3s ease;
    position: relative;
}

.grid-cell.start {
    background: linear-gradient(135deg, var(--cyan) 0%, var(--cyan-dim) 100%);
    color: var(--bg-primary);
    box-shadow: 0 0 15px var(--cyan-glow);
}

.grid-cell.end {
    background: linear-gradient(135deg, var(--amber) 0%, var(--amber-dim) 100%);
    color: var(--bg-primary);
    box-shadow: 0 0 15px var(--amber-glow);
}

.grid-cell.path {
    background: linear-gradient(135deg, var(--phosphor-green) 0%, var(--phosphor-green-dim) 100%);
    color: var(--bg-primary);
    box-shadow: 0 0 10px var(--phosphor-green-glow);
}

.grid-cell.obstacle {
    background: var(--bg-primary);
    color: var(--crimson);
    border-color: var(--crimson-dim);
}

.grid-cell.coin {
    position: relative;
}

.grid-cell.coin::after {
    content: '💰';
    position: absolute;
    font-size: 1.2rem;
}

.grid-cell.computing {
    animation: compute-pulse 0.5s ease-in-out;
}

@keyframes compute-pulse {
    0%, 100% { background: var(--bg-tertiary); }
    50% { background: rgba(57, 255, 20, 0.3); }
}

/* Path Legend */
.path-legend {
    display: flex;
    justify-content: center;
    gap: var(--space-lg);
    flex-wrap: wrap;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.legend-color {
    width: 16px;
    height: 16px;
    border-radius: 4px;
}

.legend-color.start { background: var(--cyan); }
.legend-color.end { background: var(--amber); }
.legend-color.path { background: var(--phosphor-green); }
.legend-color.obstacle { background: var(--crimson-dim); }
.legend-color.coin { background: gold; }

/* DP Visualization */
.dp-visualization {
    padding: var(--space-lg);
    background: var(--bg-card);
    border: var(--border-thin);
    border-radius: 12px;
    margin-bottom: var(--space-lg);
}

.dp-visualization h3 {
    font-family: var(--font-display);
    font-size: 1rem;
    color: var(--phosphor-green);
    margin-bottom: var(--space-md);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.dp-table-container {
    overflow-x: auto;
    padding: var(--space-md);
    background: var(--bg-secondary);
    border-radius: 8px;
    margin-bottom: var(--space-md);
}

.dp-table {
    border-collapse: collapse;
    margin: 0 auto;
}

.dp-table th,
.dp-table td {
    width: 45px;
    height: 45px;
    text-align: center;
    border: 1px solid rgba(57, 255, 20, 0.15);
    font-family: var(--font-display);
    font-size: 0.75rem;
}

.dp-table th {
    background: var(--bg-tertiary);
    color: var(--amber);
    font-weight: 600;
}

.dp-table td {
    background: var(--bg-primary);
    color: var(--text-primary);
    transition: all 0.3s ease;
}

.dp-table td.highlight {
    background: rgba(57, 255, 20, 0.2);
    color: var(--phosphor-green);
    box-shadow: inset 0 0 10px var(--phosphor-green-glow);
}

.dp-table td.current {
    background: var(--phosphor-green);
    color: var(--bg-primary);
    animation: cell-pulse 0.5s ease;
}

@keyframes cell-pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}

.dp-info {
    display: flex;
    gap: var(--space-lg);
    justify-content: center;
    flex-wrap: wrap;
}

.info-box {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--space-md);
    background: var(--bg-tertiary);
    border-radius: 8px;
    min-width: 120px;
}

.info-label {
    font-size: 0.7rem;
    color: var(--text-dim);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--space-xs);
}

.info-value {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--phosphor-green);
}

/* Algorithm Panel */
.algorithm-panel {
    padding: var(--space-lg);
    background: var(--bg-card);
    border: var(--border-thin);
    border-radius: 12px;
}

.algorithm-panel h3 {
    font-family: var(--font-display);
    font-size: 1rem;
    color: var(--amber);
    margin-bottom: var(--space-md);
}

.code-block {
    padding: var(--space-lg);
    background: var(--bg-primary);
    border-radius: 8px;
    overflow-x: auto;
    border: 1px solid rgba(57, 255, 20, 0.1);
}

.code-block code {
    font-family: 'Courier New', monospace;
    font-size: 0.85rem;
    color: var(--phosphor-green);
    line-height: 1.8;
    white-space: pre;
}

/* Inventory Screen */
.inventory-area {
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: var(--space-lg);
}

.items-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: var(--space-md);
}

.item-card {
    padding: var(--space-md);
    background: var(--bg-secondary);
    border: var(--border-thin);
    border-radius: 8px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
}

.item-card:hover {
    border-color: var(--phosphor-green);
    transform: translateY(-3px);
}

.item-card.selected {
    background: rgba(57, 255, 20, 0.1);
    border-color: var(--phosphor-green);
    box-shadow: var(--shadow-glow);
}

.item-icon {
    font-size: 2rem;
    margin-bottom: var(--space-sm);
}

.item-name {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-xs);
}

.item-stats {
    display: flex;
    justify-content: center;
    gap: var(--space-md);
    font-size: 0.75rem;
}

.item-weight {
    color: var(--crimson);
}

.item-value {
    color: var(--amber);
}

/* Backpack */
.backpack-container {
    padding: var(--space-lg);
    background: var(--bg-secondary);
    border: var(--border-thin);
    border-radius: 12px;
}

.backpack-visual {
    text-align: center;
    margin-bottom: var(--space-lg);
}

.backpack-icon {
    font-size: 4rem;
    margin-bottom: var(--space-sm);
}

.capacity-bar {
    height: 20px;
    background: var(--bg-tertiary);
    border-radius: 10px;
    overflow: hidden;
    margin-bottom: var(--space-sm);
}

.capacity-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--phosphor-green), var(--amber));
    border-radius: 10px;
    transition: width 0.5s ease;
    width: 0%;
}

.capacity-text {
    font-family: var(--font-display);
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.selected-items {
    min-height: 100px;
    margin-bottom: var(--space-md);
}

.selected-item {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm);
    background: var(--bg-tertiary);
    border-radius: 6px;
    margin-bottom: var(--space-sm);
    font-size: 0.85rem;
}

.total-value {
    font-family: var(--font-display);
    font-size: 1.25rem;
    text-align: center;
    color: var(--amber);
    padding-top: var(--space-md);
    border-top: var(--border-thin);
}

/* Combat Screen */
.combat-area {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-lg);
}

.battlefield {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2xl);
    padding: var(--space-xl);
    background: linear-gradient(180deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
    border-radius: 12px;
}

.character {
    text-align: center;
    padding: var(--space-lg);
    background: var(--bg-card);
    border-radius: 12px;
    border: var(--border-thin);
    min-width: 180px;
}

.character.player {
    border-color: var(--cyan-dim);
}

.character.enemy {
    border-color: var(--crimson-dim);
}

.character-sprite {
    font-size: 4rem;
    margin-bottom: var(--space-sm);
    animation: idle-bounce 2s ease-in-out infinite;
}

@keyframes idle-bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-5px); }
}

.character-name {
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: var(--space-sm);
}

.health-bar,
.energy-bar {
    height: 12px;
    background: var(--bg-tertiary);
    border-radius: 6px;
    overflow: hidden;
    margin-bottom: var(--space-xs);
}

.health-fill {
    height: 100%;
    border-radius: 6px;
    transition: width 0.5s ease;
}

.player-health {
    background: linear-gradient(90deg, var(--crimson), var(--amber));
    width: 100%;
}

.enemy-health {
    background: var(--crimson);
    width: 100%;
}

.energy-fill {
    height: 100%;
    background: var(--cyan);
    border-radius: 6px;
    width: 100%;
}

.health-text,
.energy-text {
    font-family: var(--font-display);
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.vs-divider {
    font-size: 2rem;
    animation: pulse-glow 1.5s ease-in-out infinite;
}

/* Skills Panel */
.skills-panel {
    padding: var(--space-lg);
    background: var(--bg-secondary);
    border-radius: 12px;
}

.skills-panel h4 {
    font-family: var(--font-display);
    font-size: 0.9rem;
    color: var(--amber);
    margin-bottom: var(--space-md);
    text-transform: uppercase;
}

.skills-list {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-md);
}

.skill-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-md);
    background: var(--bg-tertiary);
    border: var(--border-thin);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    min-width: 100px;
}

.skill-btn:hover:not(:disabled) {
    border-color: var(--phosphor-green);
    transform: translateY(-2px);
}

.skill-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.skill-btn.optimal {
    border-color: var(--amber);
    box-shadow: var(--shadow-amber);
}

.skill-icon {
    font-size: 1.5rem;
}

.skill-name {
    font-family: var(--font-display);
    font-size: 0.75rem;
    color: var(--text-primary);
}

.skill-cost {
    font-size: 0.7rem;
    color: var(--cyan);
}

.skill-damage {
    font-size: 0.7rem;
    color: var(--crimson);
}

/* Combat Log */
.combat-log {
    max-height: 150px;
    overflow-y: auto;
    padding: var(--space-md);
    background: var(--bg-primary);
    border-radius: 8px;
    font-family: monospace;
    font-size: 0.85rem;
}

.log-entry {
    padding: var(--space-xs) 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    color: var(--text-secondary);
}

.log-entry.damage {
    color: var(--crimson);
}

.log-entry.heal {
    color: var(--phosphor-green);
}

.log-entry.system {
    color: var(--cyan);
}

/* Benchmark Screen */
.benchmark-container {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

.benchmark-results {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-lg);
}

.result-card {
    padding: var(--space-xl);
    background: var(--bg-card);
    border: var(--border-thin);
    border-radius: 12px;
    text-align: center;
}

.result-card h4 {
    font-family: var(--font-display);
    font-size: 1rem;
    margin-bottom: var(--space-lg);
}

.result-card.brute-force {
    border-color: var(--crimson-dim);
}

.result-card.brute-force h4 {
    color: var(--crimson);
}

.result-card.dp-result {
    border-color: var(--phosphor-green-dim);
}

.result-card.dp-result h4 {
    color: var(--phosphor-green);
}

.result-time {
    margin-bottom: var(--space-md);
}

.time-value {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 700;
}

.brute-force .time-value {
    color: var(--crimson);
}

.dp-result .time-value {
    color: var(--phosphor-green);
}

.time-unit {
    font-size: 1rem;
    color: var(--text-secondary);
}

.result-calls {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-sm);
}

.calls-value {
    font-family: var(--font-display);
    color: var(--text-primary);
}

.complexity {
    font-size: 0.85rem;
    color: var(--text-dim);
}

.speedup-card {
    border-color: var(--amber-dim);
}

.speedup-card h4 {
    color: var(--amber);
}

.speedup-value {
    font-family: var(--font-display);
    font-size: 3rem;
    font-weight: 900;
    color: var(--amber);
    text-shadow: 0 0 20px var(--amber-glow);
}

.speedup-label {
    color: var(--text-secondary);
}

/* Benchmark Chart */
.benchmark-chart {
    padding: var(--space-lg);
    background: var(--bg-card);
    border: var(--border-thin);
    border-radius: 12px;
}

.benchmark-chart h3 {
    font-family: var(--font-display);
    font-size: 1rem;
    color: var(--amber);
    margin-bottom: var(--space-lg);
}

.chart-container {
    height: 300px;
    display: flex;
    align-items: flex-end;
    gap: var(--space-md);
    padding: var(--space-lg);
    background: var(--bg-secondary);
    border-radius: 8px;
}

.chart-bar-group {
    display: flex;
    flex-direction: column;
    align-items: center;
    flex: 1;
}

.chart-bars {
    display: flex;
    gap: var(--space-xs);
    align-items: flex-end;
    height: 200px;
}

.chart-bar {
    width: 30px;
    border-radius: 4px 4px 0 0;
    transition: height 0.5s ease;
}

.chart-bar.brute {
    background: linear-gradient(180deg, var(--crimson), var(--crimson-dim));
}

.chart-bar.dp {
    background: linear-gradient(180deg, var(--phosphor-green), var(--phosphor-green-dim));
}

.chart-label {
    margin-top: var(--space-sm);
    font-size: 0.75rem;
    color: var(--text-secondary);
}

/* Call Tree Visualization */
.call-tree-visualization {
    padding: var(--space-lg);
    background: var(--bg-card);
    border: var(--border-thin);
    border-radius: 12px;
}

.call-tree-visualization h3 {
    font-family: var(--font-display);
    font-size: 1rem;
    color: var(--amber);
    margin-bottom: var(--space-md);
}

.tree-container {
    padding: var(--space-lg);
    background: var(--bg-secondary);
    border-radius: 8px;
    overflow-x: auto;
    min-height: 200px;
}

.tree-node {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    margin: var(--space-xs);
}

.node-value {
    padding: var(--space-xs) var(--space-sm);
    background: var(--bg-tertiary);
    border: 1px solid var(--phosphor-green-dim);
    border-radius: 4px;
    font-family: var(--font-display);
    font-size: 0.75rem;
    color: var(--text-primary);
}

.node-value.duplicate {
    background: rgba(255, 176, 0, 0.2);
    border-color: var(--amber);
    color: var(--amber);
}

.tree-note {
    margin-top: var(--space-md);
    font-size: 0.85rem;
    color: var(--text-dim);
    text-align: center;
    font-style: italic;
}

/* Knapsack Table */
.knapsack-table {
    max-height: 400px;
}

/* Combat Table */
.combat-table {
    max-height: 300px;
}

/* Footer */
.game-footer {
    padding: var(--space-md) var(--space-xl);
    background: var(--bg-secondary);
    border-top: var(--border-thin);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.85rem;
    color: var(--text-dim);
}

.footer-stats {
    font-family: var(--font-display);
    color: var(--phosphor-green);
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--phosphor-green-dim);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--phosphor-green);
}

/* Responsive */
@media (max-width: 1024px) {
    .game-header {
        flex-wrap: wrap;
        gap: var(--space-md);
    }
    
    .game-nav {
        order: 3;
        width: 100%;
        justify-content: center;
    }
    
    .inventory-area {
        grid-template-columns: 1fr;
    }
    
    .benchmark-results {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .nav-btn span:last-child {
        display: none;
    }
    
    .battlefield {
        flex-direction: column;
        gap: var(--space-lg);
    }
    
    .controls-panel {
        flex-direction: column;
    }
    
    .control-buttons {
        margin-left: 0;
        width: 100%;
        flex-wrap: wrap;
    }
}