/* ========================================
   CSS Reset and Base Styles
   ======================================== */

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

html, body {
    width: 100%;
    height: 100%;
    overflow: hidden;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #87CEEB;
}

/* ========================================
   CSS Custom Properties (Color Palette)
   ======================================== */

:root {
    --background-color: #87CEEB;
    --grid-line: #D3D3D3;
    --grid-highlight: #FFFF00;
    
    --plant-sunflower: #FFD700;
    --plant-peashooter: #228B22;
    --plant-wallnut: #8B4513;
    --plant-cherry: #DC143C;
    --plant-snowpea: #87CEEB;
    
    --zombie-normal: #8B8B8B;
    --zombie-damaged: #FF0000;
    
    --sun-color: #FFFF00;
    
    --ui-text: #000000;
    --ui-background: rgba(255, 255, 255, 0.9);
    --ui-shadow: rgba(0, 0, 0, 0.3);
}

/* ========================================
   Main Game Container
   ======================================== */

.game-container {
    width: 100%;
    max-width: 500px;
    height: 100vh;
    margin: 0 auto;
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: linear-gradient(to bottom, #87CEEB 0%, #E0F6FF 100%);
}

#gameCanvas {
    border: 2px solid #333;
    background: #87CEEB;
    display: block;
    max-width: 100%;
    max-height: 100%;
    touch-action: none;
}

/* ========================================
   Loading Screen
   ======================================== */

.loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
}

.loading-content {
    text-align: center;
    color: white;
    padding: 2rem;
    max-width: 400px;
    width: 90%;
}

.loading-content h1 {
    font-size: 2rem;
    margin-bottom: 1rem;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

.loading-content .progress {
    height: 30px;
    background-color: rgba(255,255,255,0.3);
}

.loading-content p {
    margin-top: 1rem;
    font-size: 1.1rem;
}

/* ========================================
   Overlay Menus
   ======================================== */

.overlay-menu {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.85);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
}

.menu-content {
    background: var(--ui-background);
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 10px 30px var(--ui-shadow);
    text-align: center;
    max-width: 90%;
    max-height: 90%;
    overflow-y: auto;
}

.game-title {
    font-size: 2.5rem;
    color: #2d5016;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.2);
    margin-bottom: 2rem;
}

.menu-buttons {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.menu-buttons button {
    min-width: 250px;
    font-size: 1.2rem;
    padding: 0.8rem 1.5rem;
}

/* Victory/Defeat Screens */
.victory h1 {
    color: #28a745;
    font-size: 3rem;
    margin-bottom: 1.5rem;
}

.defeat h1 {
    color: #dc3545;
    font-size: 3rem;
    margin-bottom: 1rem;
}

.defeat-message {
    font-size: 1.3rem;
    color: #666;
    margin-bottom: 1.5rem;
}

.stats-container {
    background: rgba(0, 0, 0, 0.05);
    padding: 1.5rem;
    border-radius: 10px;
    margin: 1.5rem 0;
}

.stats-container p {
    font-size: 1.1rem;
    margin: 0.5rem 0;
}

/* ========================================
   Level Select
   ======================================== */

.level-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
    margin: 1.5rem 0;
}

.level-card {
    background: white;
    border: 3px solid #ddd;
    border-radius: 10px;
    padding: 1.5rem;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
}

.level-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
}

.level-card.locked {
    opacity: 0.5;
    cursor: not-allowed;
    background: #f0f0f0;
}

.level-card.locked::after {
    content: '🔒';
    position: absolute;
    top: 10px;
    right: 10px;
    font-size: 1.5rem;
}

.level-number {
    font-size: 2rem;
    font-weight: bold;
    color: #2d5016;
}

.level-name {
    font-size: 1.1rem;
    margin: 0.5rem 0;
}

.level-difficulty {
    color: #ffc107;
    font-size: 1.2rem;
}

/* ========================================
   Modals
   ======================================== */

.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 200;
}

.modal-content {
    background: white;
    border-radius: 15px;
    max-width: 90%;
    max-height: 90%;
    width: 500px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
}

.modal-header {
    background: #2d5016;
    color: white;
    padding: 1rem 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h3 {
    margin: 0;
    font-size: 1.5rem;
}

.btn-close-modal {
    background: none;
    border: none;
    color: white;
    font-size: 2rem;
    cursor: pointer;
    line-height: 1;
    padding: 0;
    width: 30px;
    height: 30px;
}

.modal-body {
    padding: 1.5rem;
    max-height: 70vh;
    overflow-y: auto;
}

.modal-body h4 {
    color: #2d5016;
    margin-top: 1rem;
    margin-bottom: 0.5rem;
}

.modal-body p, .modal-body ul, .modal-body ol {
    line-height: 1.6;
    margin-bottom: 1rem;
}

.modal-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-top: 1.5rem;
}

/* Plant Almanac Grid */
.plant-almanac-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: 1rem;
}

.plant-almanac-card {
    background: #f8f9fa;
    border: 2px solid #ddd;
    border-radius: 10px;
    padding: 1rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
}

.plant-almanac-card:hover {
    transform: scale(1.05);
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
}

.plant-icon {
    font-size: 3rem;
    margin-bottom: 0.5rem;
}

.plant-name {
    font-weight: bold;
    margin: 0.5rem 0;
}

.plant-cost {
    color: #ffc107;
    font-size: 0.9rem;
}

.plant-cooldown {
    color: #666;
    font-size: 0.8rem;
}

/* Plant Detail */
.plant-detail-header {
    text-align: center;
    margin-bottom: 1.5rem;
}

.plant-detail-icon {
    font-size: 5rem;
    margin: 1rem 0;
}

.plant-stats-table {
    width: 100%;
    margin: 1rem 0;
}

.plant-stats-table td {
    padding: 0.5rem;
    border-bottom: 1px solid #ddd;
}

.plant-stats-table td:first-child {
    font-weight: bold;
    color: #2d5016;
}

.plant-description {
    background: #f8f9fa;
    padding: 1rem;
    border-radius: 5px;
    margin-top: 1rem;
    font-style: italic;
}

/* ========================================
   Landscape Warning
   ======================================== */

.landscape-warning {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.95);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9998;
}

.landscape-content {
    text-align: center;
    color: white;
    padding: 2rem;
}

.landscape-content h2 {
    font-size: 2rem;
    margin-bottom: 1rem;
}

.landscape-content p {
    font-size: 1.2rem;
}

/* ========================================
   Tooltip
   ======================================== */

.tooltip-popup {
    position: fixed;
    background: rgba(0, 0, 0, 0.9);
    color: white;
    padding: 0.8rem 1.2rem;
    border-radius: 8px;
    font-size: 0.9rem;
    z-index: 1000;
    pointer-events: none;
    max-width: 250px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.3);
}

.tooltip-popup::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 50%;
    transform: translateX(-50%);
    border-left: 8px solid transparent;
    border-right: 8px solid transparent;
    border-top: 8px solid rgba(0, 0, 0, 0.9);
}

/* ========================================
   Responsive Design - Mobile
   ======================================== */

@media (max-width: 768px) {
    .game-container {
        max-width: 100%;
    }
    
    .game-title {
        font-size: 2rem;
    }
    
    .menu-buttons button {
        min-width: 200px;
        font-size: 1rem;
    }
    
    .modal-content {
        width: 95%;
    }
    
    .plant-almanac-grid {
        grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
    }
    
    .level-list {
        grid-template-columns: 1fr;
    }
}

/* Touch optimization */
button, .level-card, .plant-almanac-card {
    min-height: 44px;
    min-width: 44px;
}

/* Prevent text selection during gameplay */
.game-container {
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

/* ========================================
   Animations
   ======================================== */

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

.menu-content {
    animation: fadeIn 0.3s ease-out;
}

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

.level-card:not(.locked):hover {
    animation: pulse 0.5s ease-in-out;
}