/* ==================== 全局样式变量 ==================== */
:root {
    /* 主色调 - 清新绿色系 */
    --color-primary: #4CAF50;
    --color-primary-light: #81C784;
    --color-primary-dark: #388E3C;
    
    /* 辅助色 */
    --color-secondary: #FFC107;
    --color-danger: #F44336;
    --color-success: #8BC34A;
    
    /* 中性色 */
    --color-bg-light: #F5F5F5;
    --color-bg-dark: #333333;
    --color-text-primary: #212121;
    --color-text-secondary: #757575;
    --color-border: #E0E0E0;
    
    /* 游戏元素色 */
    --color-grass: #7CB342;
    --color-zombie: #8D6E63;
    --color-sun: #FFD54F;
    
    /* 网格配置 */
    --cell-width: 90px;
    --cell-height: 100px;
    --font-size-base: 14px;
}

/* ==================== 基础重置 ==================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    font-size: var(--font-size-base);
    color: var(--color-text-primary);
    background: linear-gradient(to bottom, #87CEEB 0%, #98D8C8 100%);
    overflow: hidden;
    -webkit-tap-highlight-color: transparent;
    user-select: none;
    -webkit-user-select: none;
}

/* ==================== 应用容器 ==================== */
.app-container {
    width: 100vw;
    height: 100vh;
    position: relative;
    overflow: hidden;
}

/* ==================== 屏幕基础样式 ==================== */
.screen {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: none;
    flex-direction: column;
    background: linear-gradient(to bottom, #87CEEB 0%, #98D8C8 50%, #7CB342 100%);
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
}

.screen.active {
    display: flex;
}

/* ==================== 主菜单界面 ==================== */
#main-menu {
    justify-content: center;
    align-items: center;
}

.menu-content {
    text-align: center;
    padding: 20px;
}

.game-title {
    font-size: 3rem;
    font-weight: bold;
    color: #fff;
    text-shadow: 4px 4px 8px rgba(0, 0, 0, 0.3);
    margin-bottom: 10px;
    animation: titleBounce 2s ease-in-out infinite;
}

.game-subtitle {
    font-size: 1.2rem;
    color: #fff;
    margin-bottom: 40px;
    opacity: 0.9;
}

.menu-buttons {
    display: flex;
    flex-direction: column;
    gap: 15px;
    max-width: 300px;
    margin: 0 auto;
}

.menu-buttons .btn {
    width: 100%;
}

/* ==================== 标题动画 ==================== */
@keyframes titleBounce {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-10px);
    }
}

/* ==================== 屏幕头部 ==================== */
.screen-header {
    background: rgba(76, 175, 80, 0.9);
    padding: 15px;
    display: flex;
    align-items: center;
    gap: 15px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.screen-header h2 {
    color: #fff;
    font-size: 1.5rem;
    margin: 0;
    flex: 1;
}

/* ==================== 关卡选择界面 ==================== */
.level-list {
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.level-card {
    background: #fff;
    border-radius: 10px;
    padding: 15px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    border: 3px solid transparent;
}

.level-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.level-card.unlocked {
    border-color: var(--color-primary);
}

.level-card.locked {
    opacity: 0.6;
    cursor: not-allowed;
    background: #e0e0e0;
}

.level-card.completed {
    border-color: var(--color-secondary);
}

.level-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

.level-title {
    font-size: 1.2rem;
    font-weight: bold;
    color: var(--color-text-primary);
}

.level-status {
    font-size: 1.5rem;
}

.level-description {
    color: var(--color-text-secondary);
    font-size: 0.9rem;
}

/* ==================== 关卡准备界面 ==================== */
.prepare-content {
    padding: 20px;
    overflow-y: auto;
}

.level-objective {
    background: rgba(255, 255, 255, 0.9);
    border-radius: 10px;
    padding: 15px;
    margin-bottom: 20px;
}

.level-objective h4 {
    color: var(--color-primary);
    margin-bottom: 10px;
}

.available-plants {
    background: rgba(255, 255, 255, 0.9);
    border-radius: 10px;
    padding: 15px;
    margin-bottom: 20px;
}

.available-plants h4 {
    color: var(--color-primary);
    margin-bottom: 15px;
}

.plant-cards {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.prepare-plant-card {
    background: #f0f0f0;
    border-radius: 8px;
    padding: 12px;
    display: flex;
    align-items: center;
    gap: 15px;
}

.plant-emoji {
    font-size: 2.5rem;
}

.plant-info {
    flex: 1;
}

.plant-name {
    font-weight: bold;
    color: var(--color-text-primary);
    margin-bottom: 5px;
}

.plant-cost {
    color: var(--color-secondary);
    font-size: 0.9rem;
    margin-bottom: 5px;
}

.plant-description {
    color: var(--color-text-secondary);
    font-size: 0.85rem;
}

/* ==================== 游戏战斗界面 ==================== */
#game-battle {
    background: linear-gradient(to bottom, #87CEEB 0%, #7CB342 100%);
}

/* 顶部状态栏 */
.status-bar {
    background: rgba(76, 175, 80, 0.95);
    padding: 10px 15px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
    z-index: 100;
}

.sun-counter {
    display: flex;
    align-items: center;
    gap: 5px;
    background: rgba(255, 255, 255, 0.3);
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 1.2rem;
    font-weight: bold;
    color: #fff;
}

.sun-icon {
    font-size: 1.5rem;
    animation: sunGlow 2s ease-in-out infinite;
}

.wave-progress {
    color: #fff;
    font-weight: bold;
    font-size: 1rem;
}

/* 植物选择栏 */
.plant-selector {
    background: rgba(139, 195, 74, 0.9);
    padding: 10px;
    display: flex;
    gap: 8px;
    overflow-x: auto;
    overflow-y: hidden;
    -webkit-overflow-scrolling: touch;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.15);
    z-index: 99;
}

.plant-selector::-webkit-scrollbar {
    height: 4px;
}

.plant-selector::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.5);
    border-radius: 2px;
}

.plant-card {
    background: #fff;
    border-radius: 8px;
    padding: 8px;
    min-width: 70px;
    text-align: center;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    border: 2px solid transparent;
    position: relative;
}

.plant-card:active {
    transform: scale(0.95);
}

.plant-card.selected {
    border-color: var(--color-secondary);
    box-shadow: 0 0 10px rgba(255, 193, 7, 0.5);
}

.plant-card.disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.plant-card.cooling {
    opacity: 0.6;
}

.plant-card-emoji {
    font-size: 2rem;
    display: block;
    margin-bottom: 5px;
}

.plant-card-cost {
    color: var(--color-secondary);
    font-size: 0.8rem;
    font-weight: bold;
}

.cooldown-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    font-weight: bold;
    border-radius: 8px;
}

/* 游戏战场 */
.battlefield {
    flex: 1;
    position: relative;
    overflow: hidden;
}

.grid-container {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    display: grid;
    grid-template-columns: repeat(3, var(--cell-width));
    grid-template-rows: repeat(5, var(--cell-height));
    gap: 5px;
}

.grid-cell {
    width: var(--cell-width);
    height: var(--cell-height);
    background: linear-gradient(135deg, #8BC34A 0%, #7CB342 100%);
    border: 2px solid #689F38;
    border-radius: 8px;
    cursor: pointer;
    position: relative;
    transition: background 0.2s;
}

.grid-cell:hover {
    background: linear-gradient(135deg, #9CCC65 0%, #8BC34A 100%);
}

.grid-cell.preview {
    background: linear-gradient(135deg, rgba(255, 235, 59, 0.5) 0%, rgba(255, 193, 7, 0.5) 100%);
}

.grid-cell.occupied {
    cursor: default;
}

/* 游戏对象层 */
.game-layer {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

.game-layer > * {
    pointer-events: auto;
}

/* 植物对象 */
.plant-object {
    position: absolute;
    text-align: center;
    animation: plantGrow 0.3s ease-out;
    cursor: pointer;
}

.plant-object-emoji {
    font-size: 2.5rem;
    display: block;
}

.health-bar {
    width: 80%;
    height: 6px;
    background: rgba(0, 0, 0, 0.3);
    border-radius: 3px;
    margin: 2px auto;
    overflow: hidden;
}

.health-bar-fill {
    height: 100%;
    background: linear-gradient(to right, #4CAF50, #8BC34A);
    transition: width 0.3s;
}

.health-bar-fill.low {
    background: linear-gradient(to right, #F44336, #FF5722);
}

/* 僵尸对象 */
.zombie-object {
    position: absolute;
    text-align: center;
    animation: zombieWalk 1s infinite;
}

.zombie-object-emoji {
    font-size: 2.5rem;
    display: block;
}

.zombie-object.slowed {
    filter: brightness(0.8) saturate(1.5);
}

/* 子弹对象 */
.projectile-object {
    position: absolute;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    transition: all 0.05s linear;
}

.projectile-normal {
    background: radial-gradient(circle, #8BC34A, #558B2F);
    box-shadow: 0 0 5px rgba(139, 195, 74, 0.8);
}

.projectile-ice {
    background: radial-gradient(circle, #81D4FA, #0277BD);
    box-shadow: 0 0 5px rgba(129, 212, 250, 0.8);
}

/* 太阳对象 */
.sun-object {
    position: absolute;
    width: 50px;
    height: 50px;
    background: radial-gradient(circle, #FFF59D 0%, #FFD54F 50%, #FFA726 100%);
    border-radius: 50%;
    cursor: pointer;
    animation: sunFloat 3s ease-in-out infinite;
    box-shadow: 0 0 15px rgba(255, 193, 7, 0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
}

.sun-object:hover {
    transform: scale(1.1);
}

.sun-object.collecting {
    animation: collectSun 0.5s ease-in forwards;
}

/* 底部提示区 */
.hint-bar {
    background: rgba(76, 175, 80, 0.9);
    padding: 10px 15px;
    text-align: center;
    color: #fff;
    font-size: 0.9rem;
    box-shadow: 0 -2px 4px rgba(0, 0, 0, 0.2);
    z-index: 100;
}

.hint-bar.warning {
    background: rgba(244, 67, 54, 0.9);
    animation: pulse 1s ease-in-out infinite;
}

/* ==================== 游戏结果界面 ==================== */
.result-content {
    text-align: center;
    padding: 30px 20px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    min-height: 100vh;
}

.victory-title {
    font-size: 2.5rem;
    color: #fff;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
    margin-bottom: 20px;
}

.victory-animation {
    font-size: 5rem;
    animation: spin 2s linear infinite;
    margin-bottom: 20px;
}

.defeat-title {
    font-size: 2.5rem;
    color: #fff;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
    margin-bottom: 15px;
}

.defeat-reason {
    font-size: 1.2rem;
    color: #fff;
    margin-bottom: 20px;
}

.game-stats {
    background: rgba(255, 255, 255, 0.9);
    border-radius: 10px;
    padding: 20px;
    margin: 20px auto;
    max-width: 300px;
}

.game-stats p {
    font-size: 1.1rem;
    margin: 10px 0;
    color: var(--color-text-primary);
}

.unlock-message {
    background: rgba(255, 193, 7, 0.9);
    color: #fff;
    padding: 10px 20px;
    border-radius: 20px;
    display: inline-block;
    margin: 10px auto;
    font-weight: bold;
}

.defeat-tips {
    background: rgba(255, 255, 255, 0.9);
    border-radius: 10px;
    padding: 20px;
    margin: 20px auto;
    max-width: 350px;
    text-align: left;
}

.defeat-tips h4 {
    color: var(--color-primary);
    margin-bottom: 10px;
}

.defeat-tips ul {
    list-style-position: inside;
    color: var(--color-text-primary);
}

.defeat-tips li {
    margin: 8px 0;
}

.result-buttons {
    display: flex;
    flex-direction: column;
    gap: 10px;
    max-width: 300px;
    margin: 20px auto 0;
}

/* ==================== 游戏说明界面 ==================== */
.help-content {
    padding: 20px;
    overflow-y: auto;
}

.help-content section {
    background: rgba(255, 255, 255, 0.9);
    border-radius: 10px;
    padding: 20px;
    margin-bottom: 20px;
}

.help-content h3 {
    color: var(--color-primary);
    margin-bottom: 15px;
    font-size: 1.3rem;
}

.help-content ul,
.help-content ol {
    margin-left: 20px;
}

.help-content li {
    margin: 8px 0;
    line-height: 1.6;
}

.entity-info p {
    margin: 10px 0;
    line-height: 1.6;
}

/* ==================== 模态框 ==================== */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.modal-overlay.active {
    display: flex;
}

.modal-content {
    background: #fff;
    border-radius: 15px;
    padding: 30px;
    max-width: 90%;
    width: 350px;
    text-align: center;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.modal-content h2,
.modal-content h3 {
    color: var(--color-primary);
    margin-bottom: 20px;
}

.modal-content p {
    margin-bottom: 20px;
    color: var(--color-text-primary);
}

.modal-buttons {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

/* ==================== 动画定义 ==================== */
@keyframes plantGrow {
    0% {
        transform: scale(0);
        opacity: 0;
    }
    50% {
        transform: scale(1.2);
    }
    100% {
        transform: scale(1);
        opacity: 1;
    }
}

@keyframes zombieWalk {
    0%, 100% {
        transform: translateX(0) rotate(-2deg);
    }
    50% {
        transform: translateX(-2px) rotate(2deg);
    }
}

@keyframes sunGlow {
    0%, 100% {
        filter: brightness(1);
    }
    50% {
        filter: brightness(1.3);
    }
}

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

@keyframes collectSun {
    0% {
        transform: translate(0, 0) scale(1);
        opacity: 1;
    }
    100% {
        transform: translate(var(--target-x), var(--target-y)) scale(0.3);
        opacity: 0;
    }
}

@keyframes spin {
    0% {
        transform: rotate(0deg);
    }
    100% {
        transform: rotate(360deg);
    }
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.7;
    }
}

@keyframes flash {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.3;
    }
}

.flash {
    animation: flash 0.3s;
}

/* ==================== 响应式设计 ==================== */
/* 平板设备 */
@media (min-width: 768px) {
    :root {
        --cell-width: 100px;
        --cell-height: 120px;
        --font-size-base: 16px;
    }

    .game-title {
        font-size: 3.5rem;
    }

    .menu-buttons {
        max-width: 350px;
    }
}

/* 桌面设备 */
@media (min-width: 1024px) {
    :root {
        --cell-width: 110px;
        --cell-height: 130px;
        --font-size-base: 18px;
    }

    .app-container {
        max-width: 600px;
        margin: 0 auto;
        box-shadow: 0 0 20px rgba(0, 0, 0, 0.3);
    }

    .game-title {
        font-size: 4rem;
    }
}

/* 触摸优化 - 确保最小触摸区域 */
.btn,
.plant-card,
.grid-cell,
.sun-object {
    min-width: 44px;
    min-height: 44px;
}

/* 防止文本选择和拖拽 */
img,
.plant-object-emoji,
.zombie-object-emoji,
.sun-object {
    -webkit-user-drag: none;
    -khtml-user-drag: none;
    -moz-user-drag: none;
    -o-user-drag: none;
    user-drag: none;
}

/* 滚动条样式 */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: rgba(0, 0, 0, 0.1);
}

::-webkit-scrollbar-thumb {
    background: rgba(76, 175, 80, 0.6);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(76, 175, 80, 0.8);
}