/* ========================================
   SNAKE ADVENTURE: LEGENDS OF THE FOUR SEASONS
   Complete CSS Styling & Animations
   ======================================== */

/* ========================================
   RESET & VARIABLES
   ======================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Jungle Season Colors */
    --jungle-primary: #2d5016;
    --jungle-secondary: #4a7c2f;
    --jungle-accent: #76c043;
    
    /* Snow Season Colors */
    --snow-primary: #1a4d6d;
    --snow-secondary: #5da9db;
    --snow-accent: #c7eeff;
    
    /* Desert Season Colors */
    --desert-primary: #8b4513;
    --desert-secondary: #d2691e;
    --desert-accent: #ffd700;
    
    /* Space Season Colors */
    --space-primary: #0d0d2b;
    --space-secondary: #1a1a3e;
    --space-accent: #6c63ff;
    
    /* UI Colors */
    --bg-primary: #0a0e27;
    --bg-secondary: #1a1f3a;
    --text-primary: #ffffff;
    --text-secondary: #a0a8b8;
    --accent: #00ff88;
    --danger: #ff4757;
    --warning: #ffa502;
    --success: #26de81;
    
    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 20px;
    
    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 8px rgba(0,0,0,0.4);
    --shadow-lg: 0 8px 16px rgba(0,0,0,0.5);
    --shadow-glow: 0 0 20px rgba(0,255,136,0.5);
}

/* ========================================
   GLOBAL STYLES
   ======================================== */
body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #0a0e27 0%, #1a1f3a 100%);
    color: var(--text-primary);
    margin: 0;
    padding: 0;
    width: 100vw;
    height: 100vh;
    overflow: hidden;
    display: flex;
    justify-content: center;
    align-items: center;
}

#gameContainer {
    width: 100%;
    max-width: 1400px;
    height: 100vh;
    display: flex;
    flex-direction: column;
    position: relative;
    overflow: hidden;
}

/* ========================================
   HEADER
   ======================================== */
#gameHeader {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--bg-secondary);
    border-bottom: 2px solid var(--accent);
    box-shadow: var(--shadow-md);
}

.header-left h1 {
    font-size: 1.8rem;
    margin: 0;
    background: linear-gradient(45deg, var(--accent), #00d9ff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-top: var(--spacing-xs);
}

.header-right {
    display: flex;
    gap: var(--spacing-md);
}

.icon-btn {
    width: 45px;
    height: 45px;
    font-size: 1.5rem;
    background: var(--bg-primary);
    border: 2px solid var(--accent);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.3s ease;
    color: var(--text-primary);
}

.icon-btn:hover {
    background: var(--accent);
    transform: scale(1.1);
    box-shadow: var(--shadow-glow);
}

/* ========================================
   GAME HUD
   ======================================== */
#gameHUD {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-lg);
    background: rgba(26, 31, 58, 0.9);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(0, 255, 136, 0.3);
}

#gameHUD.hidden {
    display: none;
}

.hud-left, .hud-right {
    display: flex;
    gap: var(--spacing-md);
}

.stat-box {
    display: flex;
    flex-direction: column;
    align-items: center;
    min-width: 80px;
}

.stat-label {
    font-size: 0.7rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: var(--spacing-xs);
}

.stat-value {
    font-size: 1.4rem;
    font-weight: bold;
    color: var(--accent);
    text-shadow: 0 0 10px rgba(0, 255, 136, 0.5);
}

.season-indicator {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    border: 2px solid var(--accent);
    box-shadow: var(--shadow-glow);
}

#seasonName {
    font-size: 1.2rem;
    font-weight: bold;
    text-transform: uppercase;
    letter-spacing: 2px;
}

.season-timer {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-top: var(--spacing-xs);
}

/* ========================================
   CANVAS WRAPPER
   ======================================== */
#canvasWrapper {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    overflow: hidden;
    min-height: 0;
    padding: 10px;
}

#gameCanvas {
    border: 3px solid var(--accent);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg), 0 0 30px rgba(0, 255, 136, 0.3);
    background: #000000;
    display: block;
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

/* ========================================
   MOBILE CONTROLS
   ======================================== */
#mobileControls {
    position: absolute;
    bottom: 20px;
    right: 20px;
    display: grid;
    grid-template-rows: auto auto auto;
    gap: var(--spacing-sm);
    z-index: 100;
}

#mobileControls.hidden {
    display: none;
}

.control-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-sm);
}

.control-btn {
    width: 60px;
    height: 60px;
    font-size: 1.8rem;
    background: rgba(26, 31, 58, 0.9);
    border: 2px solid var(--accent);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s ease;
    backdrop-filter: blur(10px);
    display: flex;
    justify-content: center;
    align-items: center;
}

.control-btn:active {
    background: var(--accent);
    transform: scale(0.95);
}

#upBtn {
    grid-column: 2;
}

#downBtn {
    grid-column: 2;
}

/* ========================================
   SCREENS (Start, Pause, Game Over)
   ======================================== */
.screen {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    background: rgba(10, 14, 39, 0.95);
    backdrop-filter: blur(15px);
    z-index: 1000;
    animation: fadeIn 0.3s ease;
}

.screen.hidden {
    display: none;
}

.screen-content {
    text-align: center;
    max-width: 600px;
    padding: var(--spacing-xl);
    background: var(--bg-secondary);
    border-radius: var(--radius-xl);
    border: 2px solid var(--accent);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.screen-title {
    font-size: 3rem;
    margin-bottom: var(--spacing-lg);
    background: linear-gradient(45deg, var(--accent), #00d9ff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-transform: uppercase;
    letter-spacing: 2px;
}

.animated-title {
    animation: pulse 2s ease-in-out infinite;
}

.screen-subtitle {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
}

/* ========================================
   BUTTONS
   ======================================== */
.game-btn {
    padding: var(--spacing-md) var(--spacing-xl);
    margin: var(--spacing-sm);
    font-size: 1.1rem;
    font-weight: bold;
    text-transform: uppercase;
    border: none;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all 0.3s ease;
    letter-spacing: 1px;
    min-width: 200px;
}

.primary-btn {
    background: linear-gradient(135deg, var(--accent), #00d9ff);
    color: var(--bg-primary);
    box-shadow: var(--shadow-md);
}

.primary-btn:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.secondary-btn {
    background: var(--bg-primary);
    color: var(--text-primary);
    border: 2px solid var(--accent);
}

.secondary-btn:hover {
    background: var(--accent);
    color: var(--bg-primary);
    transform: translateY(-2px);
}

/* ========================================
   EVOLUTION PREVIEW
   ======================================== */
.evolution-preview {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    margin: var(--spacing-lg) 0;
}

.evo-icon {
    font-size: 2rem;
    animation: float 3s ease-in-out infinite;
}

.evo-icon:nth-child(2) { animation-delay: 0.2s; }
.evo-icon:nth-child(3) { animation-delay: 0.4s; }
.evo-icon:nth-child(4) { animation-delay: 0.6s; }
.evo-icon:nth-child(5) { animation-delay: 0.8s; }
.evo-icon:nth-child(6) { animation-delay: 1s; }

/* ========================================
   GAME INFO
   ======================================== */
.game-info {
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.game-info p {
    color: var(--text-secondary);
    margin: var(--spacing-xs) 0;
}

/* ========================================
   FINAL STATS (Game Over Screen)
   ======================================== */
.final-stats {
    background: var(--bg-primary);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-lg);
}

.stat-row {
    display: flex;
    justify-content: space-between;
    padding: var(--spacing-sm) 0;
    font-size: 1.2rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.stat-row:last-child {
    border-bottom: none;
}

.stat-row span:last-child {
    color: var(--accent);
    font-weight: bold;
}

/* ========================================
   HOW TO PLAY SCREEN
   ======================================== */
.instructions {
    text-align: left;
    margin-bottom: var(--spacing-lg);
}

.instruction-item {
    background: var(--bg-primary);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
    border-left: 4px solid var(--accent);
}

.instruction-item h3 {
    color: var(--accent);
    margin-bottom: var(--spacing-sm);
    font-size: 1.2rem;
}

.instruction-item p {
    color: var(--text-secondary);
    line-height: 1.6;
    margin: var(--spacing-xs) 0;
}

/* ========================================
   NOTIFICATION SYSTEM
   ======================================== */
#notificationContainer {
    position: fixed;
    top: 100px;
    right: 20px;
    z-index: 2000;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.notification {
    background: var(--bg-secondary);
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-lg);
    border: 2px solid var(--accent);
    box-shadow: var(--shadow-lg);
    min-width: 250px;
    animation: slideIn 0.3s ease, fadeOut 0.3s ease 2.7s;
}

.notification.success {
    border-color: var(--success);
}

.notification.warning {
    border-color: var(--warning);
}

.notification.danger {
    border-color: var(--danger);
}

/* ========================================
   ANIMATIONS
   ======================================== */
@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes fadeOut {
    from {
        opacity: 1;
    }
    to {
        opacity: 0;
    }
}

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
}

@keyframes float {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-10px);
    }
}

/* ========================================
   RESPONSIVE DESIGN
   ======================================== */
@media (max-width: 768px) {
    .header-left h1 {
        font-size: 1.2rem;
    }
    
    .subtitle {
        font-size: 0.7rem;
    }
    
    .icon-btn {
        width: 35px;
        height: 35px;
        font-size: 1.2rem;
    }
    
    #gameHUD {
        flex-wrap: wrap;
        padding: var(--spacing-sm);
    }
    
    .stat-box {
        min-width: 60px;
    }
    
    .stat-label {
        font-size: 0.6rem;
    }
    
    .stat-value {
        font-size: 1rem;
    }
    
    #seasonName {
        font-size: 0.9rem;
    }
    
    .season-timer {
        font-size: 0.7rem;
    }
    
    .screen-title {
        font-size: 2rem;
    }
    
    .screen-content {
        max-width: 90%;
        padding: var(--spacing-lg);
    }
    
    .game-btn {
        min-width: 150px;
        font-size: 0.9rem;
        padding: var(--spacing-sm) var(--spacing-lg);
    }
    
    .evolution-preview {
        gap: var(--spacing-sm);
    }
    
    .evo-icon {
        font-size: 1.5rem;
    }
    
    #mobileControls {
        display: grid;
    }
}

@media (max-width: 480px) {
    .header-left h1 {
        font-size: 1rem;
    }
    
    .screen-title {
        font-size: 1.5rem;
    }
    
    .control-btn {
        width: 50px;
        height: 50px;
        font-size: 1.5rem;
    }
}


/* ========================================
   PHASES 8-12 ADDITIONAL STYLES
   ======================================== */

/* Mission Panel */
.mission-panel {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: var(--bg-secondary);
    border: 2px solid var(--accent);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    z-index: 1500;
    max-width: 500px;
    width: 90%;
    box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.mission-panel.hidden {
    display: none;
}

.mission-panel h2 {
    color: var(--accent);
    margin-bottom: var(--spacing-lg);
    text-align: center;
}

#missionList {
    max-height: 400px;
    overflow-y: auto;
}

.mission-item {
    background: var(--bg-primary);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
    border-left: 4px solid var(--accent);
}

.mission-item.completed {
    border-left-color: var(--success);
    opacity: 0.7;
}

.mission-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xs);
}

.mission-status {
    font-size: 1.2rem;
}

.mission-name {
    font-weight: bold;
    color: var(--text-primary);
}

.mission-desc {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin: var(--spacing-xs) 0;
}

.mission-progress-bar {
    height: 6px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-sm);
    overflow: hidden;
    margin: var(--spacing-sm) 0;
}

.mission-progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent), var(--success));
    transition: width 0.3s ease;
}

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

.mission-reward {
    color: var(--warning);
    font-weight: bold;
}

/* AI Controls Panel */
.ai-panel {
    padding: var(--spacing-sm);
    background: rgba(0, 0, 0, 0.3);
    border-radius: var(--radius-md);
    margin-top: var(--spacing-sm);
}

.ai-controls {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.ai-controls label {
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: bold;
}

.ai-btn {
    padding: var(--spacing-xs) var(--spacing-md);
    background: var(--bg-primary);
    border: 2px solid var(--accent);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    cursor: pointer;
    font-size: 0.85rem;
    transition: all 0.2s ease;
}

.ai-btn:hover {
    background: var(--accent);
    color: var(--bg-primary);
    transform: translateY(-2px);
}

/* Game Mode Selector */
.mode-selector {
    margin: var(--spacing-lg) 0;
    text-align: center;
}

.mode-selector h3 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
    font-size: 1.1rem;
}

.mode-select {
    width: 100%;
    padding: var(--spacing-md);
    background: var(--bg-primary);
    border: 2px solid var(--accent);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

.mode-select:hover {
    border-color: var(--success);
    box-shadow: 0 0 10px rgba(0, 255, 136, 0.3);
}

.mode-select option {
    background: var(--bg-primary);
    color: var(--text-primary);
    padding: var(--spacing-sm);
}

/* Portal Button Styling */
button[style*="position: fixed"] {
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .mission-panel {
        max-width: 90%;
        padding: var(--spacing-md);
    }
    
    .ai-controls {
        justify-content: center;
    }
    
    .ai-btn {
        font-size: 0.75rem;
        padding: 6px 12px;
    }
}