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

body {
    font-family: 'Microsoft YaHei', Arial, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: #333;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
}

header {
    text-align: center;
    margin-bottom: 30px;
}

header h1 {
    color: white;
    font-size: 2.5em;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

.page {
    display: none;
    background: white;
    border-radius: 15px;
    padding: 30px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
}

.page.active {
    display: block;
}

.menu {
    display: flex;
    flex-direction: column;
    gap: 20px;
    align-items: center;
}

.menu-btn {
    background: linear-gradient(45deg, #ff6b6b, #ffa500);
    color: white;
    border: none;
    padding: 20px 40px;
    font-size: 1.2em;
    border-radius: 25px;
    cursor: pointer;
    transition: transform 0.3s;
    min-width: 250px;
}

.menu-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
}

input[type="text"] {
    width: 100%;
    padding: 12px;
    border: 2px solid #ddd;
    border-radius: 8px;
    font-size: 16px;
}

input[type="text"]:focus {
    border-color: #667eea;
    outline: none;
}

.word-form {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
}

.word-form input {
    flex: 1;
}

.word-form button {
    background: #4CAF50;
    color: white;
    border: none;
    padding: 12px 20px;
    border-radius: 8px;
    cursor: pointer;
}

#word-list {
    background: #f9f9f9;
    border-radius: 8px;
    padding: 15px;
    margin-bottom: 20px;
    min-height: 100px;
}

.word-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px;
    border-bottom: 1px solid #eee;
}

.word-item:last-child {
    border-bottom: none;
}

.delete-btn {
    background: #ff4757;
    color: white;
    border: none;
    padding: 5px 10px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 12px;
}

.wordbook-item {
    background: #f8f9fa;
    border: 2px solid #e9ecef;
    border-radius: 10px;
    padding: 20px;
    margin-bottom: 15px;
    transition: all 0.3s;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.wordbook-item:hover {
    border-color: #667eea;
    transform: translateY(-2px);
}

.wordbook-content {
    flex: 1;
    cursor: pointer;
}

.wordbook-actions {
    display: flex;
    gap: 10px;
    margin-left: 15px;
}

.edit-btn {
    background: #28a745;
    color: white;
    border: none;
    padding: 8px 15px;
    border-radius: 5px;
    cursor: pointer;
    font-size: 14px;
    transition: background 0.3s;
}

.edit-btn:hover {
    background: #218838;
}

.delete-wordbook-btn {
    background: #dc3545;
    color: white;
    border: none;
    padding: 8px 15px;
    border-radius: 5px;
    cursor: pointer;
    font-size: 14px;
    transition: background 0.3s;
}

.delete-wordbook-btn:hover {
    background: #c82333;
}

.difficulty-buttons {
    display: flex;
    gap: 10px;
    margin-top: 15px;
    justify-content: center;
}

.difficulty-btn {
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 14px;
    font-weight: bold;
    transition: all 0.3s;
    flex: 1;
    max-width: 120px;
}

.difficulty-btn.easy {
    background: linear-gradient(45deg, #4CAF50, #45a049);
    color: white;
}

.difficulty-btn.easy:hover {
    background: linear-gradient(45deg, #45a049, #3d8b40);
    transform: translateY(-2px);
}

.difficulty-btn.hard {
    background: linear-gradient(45deg, #ff6b6b, #ff5252);
    color: white;
}

.difficulty-btn.hard:hover {
    background: linear-gradient(45deg, #ff5252, #e53935);
    transform: translateY(-2px);
}

.wordbook-item h3 {
    color: #333;
    margin-bottom: 10px;
}

.wordbook-item p {
    color: #666;
    font-size: 14px;
}

.game-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    padding-bottom: 15px;
    border-bottom: 2px solid #eee;
}

.progress {
    background: #667eea;
    color: white;
    padding: 8px 15px;
    border-radius: 20px;
    font-weight: bold;
}

.meaning-section {
    margin-bottom: 30px;
}

.meaning-title {
    text-align: center;
    color: #333;
    margin-bottom: 15px;
    font-size: 1.3em;
    font-weight: bold;
}

.meaning-box {
    background: #ff6b6b;
    color: #ffffff;
    font-size: 3em;
    font-weight: bold;
    text-align: center;
    padding: 30px;
    border-radius: 20px;
    margin-bottom: 30px;
    border: 5px solid #333;
    box-shadow: 0 8px 20px rgba(0,0,0,0.3);
    min-height: 100px;
    display: flex;
    align-items: center;
    justify-content: center;
}



.word-puzzle {
    text-align: center;
    font-size: 3em;
    font-family: 'Courier New', monospace;
    margin-bottom: 30px;
    letter-spacing: 10px;
}

.letter-slot {
    display: inline-block;
    width: 60px;
    height: 60px;
    border: 3px solid #ddd;
    border-radius: 8px;
    margin: 0 5px;
    line-height: 54px;
    text-align: center;
    background: white;
    cursor: pointer;
    transition: all 0.3s;
}

.letter-slot.filled {
    background: #4CAF50;
    color: white;
    border-color: #4CAF50;
}

.letter-slot.correct {
    background: #4CAF50;
    border-color: #4CAF50;
}

.letter-slot.incorrect {
    background: #ff4757;
    border-color: #ff4757;
}

.letter-options {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 30px;
    max-height: 200px;
    overflow-y: auto;
    padding: 10px;
    border-radius: 10px;
    background: rgba(255,255,255,0.1);
}

.letter-option {
    width: 45px;
    height: 45px;
    background: #667eea;
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 1.3em;
    cursor: pointer;
    transition: all 0.3s;
    font-weight: bold;
}

.letter-option:hover {
    background: #5a67d8;
    transform: scale(1.1);
}



.letter-slot.selected {
    border-color: #667eea !important;
    box-shadow: 0 0 10px rgba(102, 126, 234, 0.5);
}

.action-buttons {
    display: flex;
    gap: 15px;
    justify-content: center;
    margin-top: 20px;
}

button {
    background: #667eea;
    color: white;
    border: none;
    padding: 12px 25px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 16px;
    transition: background 0.3s;
}

button:hover {
    background: #5a67d8;
}

.back-btn {
    background: #6c757d;
    margin-top: 20px;
}

.back-btn:hover {
    background: #5a6268;
}

#submit-answer {
    background: #28a745;
    font-size: 1.2em;
    padding: 15px 30px;
}

#submit-answer:hover {
    background: #218838;
}

#next-word {
    background: #17a2b8;
}

#next-word:hover {
    background: #138496;
}

.result-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px;
    margin-bottom: 10px;
    border-radius: 8px;
    background: #f8f9fa;
}

.result-item.correct {
    border-left: 5px solid #28a745;
}

.result-item.incorrect {
    border-left: 5px solid #dc3545;
}

.score {
    text-align: center;
    font-size: 2em;
    margin-bottom: 30px;
    padding: 20px;
    background: linear-gradient(45deg, #667eea, #764ba2);
    color: white;
    border-radius: 15px;
}

@media (max-width: 600px) {
    .container {
        padding: 10px;
    }
    
    .word-form {
        flex-direction: column;
    }
    
    .meaning-title {
        font-size: 1.1em;
    }
    
    .meaning-box {
        font-size: 2.2em;
        padding: 20px;
        min-height: 80px;
    }
    
    .word-puzzle {
        font-size: 2em;
        letter-spacing: 5px;
    }
    
    .letter-slot {
        width: 45px;
        height: 45px;
        line-height: 39px;
        margin: 0 2px;
    }
    
    .wordbook-item {
        flex-direction: column;
        align-items: stretch;
    }
    
    .wordbook-actions {
        margin-left: 0;
        margin-top: 15px;
        justify-content: center;
    }
    
    .difficulty-buttons {
        flex-direction: column;
        gap: 8px;
    }
    
    .difficulty-btn {
        max-width: none;
    }
    
    .letter-option {
        width: 40px;
        height: 40px;
        font-size: 1.1em;
    }
    
    .word-display-area {
        flex-direction: column;
    }
    
    .word-slots {
        width: 100%;
    }
    
    .letter-slot-bubble {
        width: 45px;
        height: 45px;
        font-size: 1.3em;
    }
    
    .keyboard-letter {
        width: 40px;
        height: 40px;
        font-size: 1em;
    }
    
    .cannon-area {
        flex-direction: column;
    }
    
    .cannon-display {
        width: 100%;
        justify-content: center;
    }
    
    #fire-btn {
        width: 100%;
    }
}


/* 泡泡大战样式 */
.bubble-btn {
    background: linear-gradient(45deg, #667eea, #764ba2) !important;
    animation: pulse 2s infinite;
}

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

.bubble-game-header {
    margin-bottom: 20px;
}

.game-stats {
    display: flex;
    justify-content: space-around;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 15px;
    border-radius: 15px;
    color: white;
}

.stat-item {
    text-align: center;
}

.stat-label {
    display: block;
    font-size: 0.9em;
    opacity: 0.9;
    margin-bottom: 5px;
}

.stat-value {
    display: block;
    font-size: 2em;
    font-weight: bold;
}

.stat-value.combo {
    color: #ffd700;
    text-shadow: 0 0 10px rgba(255, 215, 0, 0.5);
}

#bubble-canvas {
    width: 100%;
    max-width: 600px;
    height: 400px;
    background: linear-gradient(180deg, #87CEEB 0%, #E0F6FF 100%);
    border-radius: 15px;
    border: 3px solid #667eea;
    display: block;
    margin: 0 auto 20px;
    cursor: crosshair;
    touch-action: none;
    user-select: none;
}

#bubble-canvas:hover {
    border-color: #764ba2;
    box-shadow: 0 0 20px rgba(102, 126, 234, 0.5);
}

.bullet-section {
    background: white;
    border-radius: 15px;
    padding: 20px;
    margin-bottom: 20px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.chinese-hint {
    text-align: center;
    font-size: 2em;
    font-weight: bold;
    color: #ff6b6b;
    background: #fff3cd;
    padding: 15px 20px;
    border-radius: 10px;
    margin-bottom: 15px;
    border: 3px solid #ffc107;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
    flex-wrap: wrap;
}

.word-display-area {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 15px;
}

.word-slots {
    flex: 1;
    display: flex;
    justify-content: center;
    gap: 5px;
    min-height: 60px;
    padding: 10px;
    background: white;
    border: 3px solid #667eea;
    border-radius: 10px;
    flex-wrap: wrap;
}

.letter-slot-bubble {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5em;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s;
    box-shadow: 0 2px 5px rgba(0,0,0,0.2);
}

.letter-slot-bubble:hover {
    transform: translateY(-3px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.3);
}

.letter-slot-bubble.empty {
    background: #e0e0e0;
    color: #999;
    cursor: default;
}

.letter-slot-bubble.empty:hover {
    transform: none;
    box-shadow: 0 2px 5px rgba(0,0,0,0.2);
}

.clear-btn {
    padding: 10px 20px;
    background: #ff6b6b;
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-weight: bold;
    transition: all 0.3s;
}

.clear-btn:hover {
    background: #ff5252;
    transform: scale(1.05);
}

.letter-keyboard {
    display: flex;
    flex-wrap: wrap;
    gap: 5px;
    justify-content: center;
    padding: 15px;
    background: #f8f9fa;
    border-radius: 10px;
    margin-bottom: 15px;
}

.keyboard-letter {
    width: 45px;
    height: 45px;
    background: #667eea;
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 1.2em;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.2s;
    box-shadow: 0 2px 4px rgba(0,0,0,0.2);
}

.keyboard-letter:hover {
    background: #5a67d8;
    transform: scale(1.1);
}

.keyboard-letter:active {
    transform: scale(0.95);
}

.combo-bonus-info {
    background: linear-gradient(135deg, #ffd700, #ff6b6b);
    color: white;
    border-radius: 10px;
    padding: 12px 20px;
    margin-bottom: 15px;
    text-align: center;
    font-weight: bold;
    box-shadow: 0 2px 8px rgba(0,0,0,0.2);
}

.bonus-label {
    font-size: 1em;
    margin-right: 10px;
}

.bonus-value {
    font-size: 1.1em;
    text-shadow: 0 1px 2px rgba(0,0,0,0.2);
}

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

.upgrade-label {
    font-weight: bold;
    color: #333;
}

.upgrade-combo {
    font-weight: bold;
    color: #667eea;
    font-size: 1.1em;
}

.progress-bar {
    width: 100%;
    height: 25px;
    background: #e0e0e0;
    border-radius: 15px;
    overflow: hidden;
    margin-bottom: 10px;
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.1);
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #ffd700, #ff6b6b);
    border-radius: 15px;
    transition: all 0.3s ease;
    width: 0%;
    position: relative;
}

.progress-fill.super {
    background: linear-gradient(90deg, #00ff00, #00cc00);
    box-shadow: 0 0 10px rgba(0, 255, 0, 0.5);
}

.progress-fill.mega {
    background: linear-gradient(90deg, #ff00ff, #cc00cc);
    box-shadow: 0 0 15px rgba(255, 0, 255, 0.5);
}

.upgrade-levels {
    display: flex;
    justify-content: space-between;
    position: relative;
}

.level-marker {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 5px;
    opacity: 0.5;
    transition: all 0.3s;
}

.level-marker.active {
    opacity: 1;
    transform: scale(1.2);
}

.level-icon {
    font-size: 1.5em;
}

.level-name {
    font-size: 0.8em;
    font-weight: bold;
    color: #666;
}

.level-marker.active .level-name {
    color: #667eea;
}

.cannon-area {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 15px;
}

.cannon-display {
    flex: 1;
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 15px;
    background: linear-gradient(135deg, #2c3e50, #34495e);
    border-radius: 10px;
}

.cannon-base {
    width: 80px;
    height: 60px;
    background: linear-gradient(135deg, #7f8c8d, #95a5a6);
    border-radius: 10px;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 8px rgba(0,0,0,0.3);
}

.cannon-barrel {
    width: 60px;
    height: 20px;
    background: linear-gradient(90deg, #34495e, #2c3e50);
    border-radius: 10px;
    position: relative;
    transform-origin: left center;
    transition: all 0.3s;
    box-shadow: 0 2px 4px rgba(0,0,0,0.3);
}

.cannon-barrel.normal {
    background: linear-gradient(90deg, #ffd700, #ff6b6b);
}

.cannon-barrel.super {
    background: linear-gradient(90deg, #00ff00, #00cc00);
    box-shadow: 0 0 15px rgba(0, 255, 0, 0.6);
}

.cannon-barrel.mega {
    background: linear-gradient(90deg, #ff00ff, #cc00cc);
    box-shadow: 0 0 20px rgba(255, 0, 255, 0.6);
}

.cannon-tip {
    position: absolute;
    right: -10px;
    top: 50%;
    transform: translateY(-50%);
    width: 15px;
    height: 15px;
    background: inherit;
    border-radius: 50%;
}

.bullet-mode {
    flex: 1;
    text-align: center;
    color: white;
}

.mode-label {
    display: block;
    font-size: 0.9em;
    opacity: 0.8;
    margin-bottom: 5px;
}

.mode-type {
    display: block;
    font-size: 1.5em;
    font-weight: bold;
}

.mode-type.normal {
    color: #ffd700;
    text-shadow: 0 0 10px rgba(255, 215, 0, 0.8);
}

.mode-type.super {
    color: #00ff00;
    text-shadow: 0 0 10px rgba(0, 255, 0, 0.8);
}

.mode-type.mega {
    color: #ff00ff;
    text-shadow: 0 0 10px rgba(255, 0, 255, 0.8);
}

.mode-ability {
    display: block;
    font-size: 0.7em;
    opacity: 0.9;
    margin-top: 5px;
    color: rgba(255, 255, 255, 0.8);
}

#fire-btn {
    padding: 15px 30px;
    font-size: 1.2em;
    background: linear-gradient(45deg, #ff6b6b, #ff5252);
    color: white;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    font-weight: bold;
    transition: all 0.3s;
}

#fire-btn:hover:not(:disabled) {
    background: linear-gradient(45deg, #ff5252, #e53935);
    transform: scale(1.05);
}

#fire-btn:disabled {
    background: #ccc;
    cursor: not-allowed;
    opacity: 0.6;
}

.bullet-status {
    text-align: center;
    font-size: 1.1em;
    color: #666;
    padding: 10px;
    background: #f8f9fa;
    border-radius: 8px;
}

.bullet-status.correct {
    background: #d4edda;
    color: #155724;
    font-weight: bold;
}

.bullet-status.wrong {
    background: #f8d7da;
    color: #721c24;
    font-weight: bold;
}

/* 泡泡样式 */
.bubble {
    position: absolute;
    border-radius: 50%;
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
}

/* 子弹样式 */
.bullet {
    position: absolute;
    width: 30px;
    height: 30px;
    background: radial-gradient(circle, #ffd700, #ff6b6b);
    border-radius: 50%;
    box-shadow: 0 0 20px rgba(255, 215, 0, 0.8);
}

.bullet.super {
    width: 40px;
    height: 40px;
    background: radial-gradient(circle, #00ff00, #00cc00);
    box-shadow: 0 0 30px rgba(0, 255, 0, 0.8);
}

.bullet.mega {
    width: 50px;
    height: 50px;
    background: radial-gradient(circle, #ff00ff, #cc00cc);
    box-shadow: 0 0 40px rgba(255, 0, 255, 0.8);
}

/* 连击提示 */
.combo-popup {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 3em;
    font-weight: bold;
    color: #ffd700;
    text-shadow: 0 0 20px rgba(255, 215, 0, 0.8);
    animation: comboAnim 1s ease-out;
    pointer-events: none;
    z-index: 1000;
}

@keyframes comboAnim {
    0% { transform: translate(-50%, -50%) scale(0); opacity: 0; }
    50% { transform: translate(-50%, -50%) scale(1.2); opacity: 1; }
    100% { transform: translate(-50%, -50%) scale(1); opacity: 0; }
}

/* 升级提示 */
.upgrade-popup {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: linear-gradient(135deg, #667eea, #764ba2);
    padding: 30px 50px;
    border-radius: 20px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.3);
    animation: upgradeAnim 2s ease-out;
    pointer-events: none;
    z-index: 1001;
    text-align: center;
}

.upgrade-icon {
    font-size: 4em;
    margin-bottom: 10px;
    animation: rotateIcon 0.5s ease-out;
}

.upgrade-text {
    font-size: 2em;
    font-weight: bold;
    color: #ffd700;
    text-shadow: 0 0 10px rgba(255, 215, 0, 0.8);
    margin-bottom: 5px;
}

.upgrade-name {
    font-size: 1.5em;
    font-weight: bold;
    color: white;
}

@keyframes upgradeAnim {
    0% { 
        transform: translate(-50%, -50%) scale(0) rotate(-180deg); 
        opacity: 0; 
    }
    50% { 
        transform: translate(-50%, -50%) scale(1.2) rotate(10deg); 
        opacity: 1; 
    }
    70% {
        transform: translate(-50%, -50%) scale(1) rotate(-5deg);
    }
    100% { 
        transform: translate(-50%, -50%) scale(1) rotate(0deg); 
        opacity: 0; 
    }
}

@keyframes rotateIcon {
    0% { transform: rotate(0deg) scale(0); }
    50% { transform: rotate(180deg) scale(1.2); }
    100% { transform: rotate(360deg) scale(1); }
}

/* 武器解锁提示 */
.weapon-unlock-popup {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: linear-gradient(135deg, #ffd700, #ff6b6b);
    padding: 30px 50px;
    border-radius: 20px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.3);
    animation: unlockAnim 3s ease-out;
    pointer-events: none;
    z-index: 1002;
    text-align: center;
    border: 3px solid #fff;
}

.unlock-icon {
    font-size: 4em;
    margin-bottom: 10px;
    animation: bounceIcon 0.6s ease-out;
}

.unlock-text {
    font-size: 1.8em;
    font-weight: bold;
    color: #fff;
    text-shadow: 0 2px 4px rgba(0,0,0,0.3);
    margin-bottom: 5px;
}

.unlock-name {
    font-size: 1.5em;
    font-weight: bold;
    color: #fff;
    margin-bottom: 5px;
}

.unlock-desc {
    font-size: 1em;
    color: rgba(255,255,255,0.9);
}

@keyframes unlockAnim {
    0% { 
        transform: translate(-50%, -50%) scale(0) rotate(-180deg); 
        opacity: 0; 
    }
    50% { 
        transform: translate(-50%, -50%) scale(1.1) rotate(10deg); 
        opacity: 1; 
    }
    80% {
        transform: translate(-50%, -50%) scale(1) rotate(0deg);
    }
    100% { 
        transform: translate(-50%, -50%) scale(0.8); 
        opacity: 0; 
    }
}

@keyframes bounceIcon {
    0%, 100% { transform: translateY(0); }
    25% { transform: translateY(-20px); }
    50% { transform: translateY(0); }
    75% { transform: translateY(-10px); }
}

/* 武器切换通知 */
.weapon-change-notification {
    position: fixed;
    top: 20px;
    right: 20px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    padding: 15px 25px;
    border-radius: 10px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.3);
    display: flex;
    align-items: center;
    gap: 10px;
    z-index: 1003;
    transform: translateX(400px);
    transition: transform 0.3s ease;
}

.weapon-change-notification.show {
    transform: translateX(0);
}

.notification-icon {
    font-size: 2em;
}

.notification-text {
    font-size: 1.1em;
    font-weight: bold;
}

/* 响应式设计 */
@media (max-width: 600px) {
    #bubble-canvas {
        height: 300px;
    }
    
    .game-stats {
        flex-direction: column;
        gap: 10px;
    }
    
    .stat-value {
        font-size: 1.5em;
    }
    
    .chinese-hint {
        font-size: 1.5em;
    }
    
    .bullet-input-area {
        flex-direction: column;
    }
    
    #fire-btn {
        width: 100%;
    }
    
    .upgrade-progress {
        padding: 10px;
    }
    
    .upgrade-levels {
        gap: 5px;
    }
    
    .level-icon {
        font-size: 1.2em;
    }
    
    .level-name {
        font-size: 0.7em;
    }
    
    .upgrade-popup {
        padding: 20px 30px;
    }
    
    .upgrade-icon {
        font-size: 3em;
    }
    
    .upgrade-text {
        font-size: 1.5em;
    }
    
    .upgrade-name {
        font-size: 1.2em;
    }
    
    .weapon-selector-content {
        grid-template-columns: repeat(auto-fill, minmax(70px, 1fr));
    }
    
    .weapon-btn-icon {
        font-size: 1.5em;
    }
    
    .weapon-btn-name {
        font-size: 0.7em;
    }
    
    .weapon-change-notification {
        top: 10px;
        right: 10px;
        left: 10px;
        padding: 12px 15px;
    }
    
    .notification-icon {
        font-size: 1.5em;
    }
    
    .notification-text {
        font-size: 0.9em;
    }
}


/* 游戏内武器选择器 */
.weapon-selector {
    background: white;
    border-radius: 10px;
    margin-bottom: 15px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    overflow: hidden;
}

.weapon-selector-title {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 15px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    font-weight: bold;
    cursor: pointer;
}

.toggle-selector {
    background: rgba(255,255,255,0.2);
    border: none;
    color: white;
    padding: 5px 10px;
    border-radius: 5px;
    cursor: pointer;
    font-size: 1em;
    transition: all 0.3s;
}

.toggle-selector:hover {
    background: rgba(255,255,255,0.3);
}

.weapon-selector-content {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
    gap: 8px;
    padding: 15px;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.weapon-selector-content.open {
    max-height: 500px;
}

.weapon-btn {
    background: white;
    border: 2px solid #e0e0e0;
    border-radius: 10px;
    padding: 10px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s;
    position: relative;
}

.weapon-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
}

.weapon-btn.selected {
    border-color: #667eea;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1), rgba(118, 75, 162, 0.1));
}

.weapon-btn.locked {
    opacity: 0.4;
    cursor: not-allowed;
}

.weapon-btn.locked:hover {
    transform: none;
    box-shadow: none;
}

.weapon-btn-icon {
    font-size: 2em;
    margin-bottom: 5px;
}

.weapon-btn-name {
    font-size: 0.75em;
    color: #333;
    font-weight: bold;
}

.weapon-btn-badge {
    position: absolute;
    top: -5px;
    right: -5px;
    background: #4CAF50;
    color: white;
    border-radius: 50%;
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.7em;
    font-weight: bold;
}

.weapon-btn.locked .weapon-btn-badge {
    background: #999;
}

/* 总积分显示 */
.total-score-display {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: linear-gradient(135deg, #ffd700, #ff6b6b);
    color: white;
    padding: 15px 20px;
    border-radius: 10px;
    margin-bottom: 20px;
    font-size: 1.2em;
}

.arsenal-btn {
    background: white;
    color: #667eea;
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s;
}

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

/* 兵器库 */
.arsenal-info {
    background: #f8f9fa;
    padding: 15px;
    border-radius: 10px;
    margin-bottom: 20px;
    text-align: center;
}

.arsenal-info p {
    margin: 5px 0;
    font-size: 1.1em;
}

#arsenal-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 15px;
    margin-bottom: 20px;
}

.weapon-card {
    background: white;
    border: 3px solid #e0e0e0;
    border-radius: 15px;
    padding: 20px;
    text-align: center;
    transition: all 0.3s;
    position: relative;
}

.weapon-card.unlocked {
    border-color: #4CAF50;
    cursor: pointer;
}

.weapon-card.unlocked:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 16px rgba(0,0,0,0.2);
}

.weapon-card.selected {
    border-color: #667eea;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1), rgba(118, 75, 162, 0.1));
}

.weapon-card.locked {
    opacity: 0.6;
    cursor: not-allowed;
}

.weapon-icon {
    font-size: 3em;
    margin-bottom: 10px;
}

.weapon-name {
    font-size: 1.2em;
    font-weight: bold;
    color: #333;
    margin-bottom: 5px;
}

.weapon-desc {
    font-size: 0.9em;
    color: #666;
    margin-bottom: 10px;
}

.weapon-score {
    font-size: 0.9em;
    color: #667eea;
    font-weight: bold;
}

.weapon-card.locked .weapon-score {
    color: #999;
}

.weapon-status {
    position: absolute;
    top: 10px;
    right: 10px;
    padding: 5px 10px;
    border-radius: 5px;
    font-size: 0.8em;
    font-weight: bold;
}

.weapon-status.unlocked {
    background: #4CAF50;
    color: white;
}

.weapon-status.locked {
    background: #999;
    color: white;
}

.weapon-status.selected {
    background: #667eea;
    color: white;
}

@media (max-width: 600px) {
    #arsenal-container {
        grid-template-columns: 1fr;
    }
    
    .total-score-display {
        flex-direction: column;
        gap: 10px;
    }
    
    .arsenal-btn {
        width: 100%;
    }
}


/* BOSS出现提示 */
.boss-appear-popup {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: linear-gradient(135deg, #ff0000, #cc0000);
    padding: 40px 60px;
    border-radius: 20px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.5);
    animation: bossAppearAnim 3s ease-out;
    pointer-events: none;
    z-index: 1004;
    text-align: center;
    border: 4px solid #ffd700;
}

.boss-appear-icon {
    font-size: 5em;
    margin-bottom: 15px;
    animation: bossShake 0.5s ease-in-out infinite;
}

.boss-appear-text {
    font-size: 2.5em;
    font-weight: bold;
    color: #ffd700;
    text-shadow: 0 0 20px rgba(255, 215, 0, 0.8);
    margin-bottom: 10px;
}

.boss-appear-hp {
    font-size: 1.5em;
    color: white;
    font-weight: bold;
}

@keyframes bossAppearAnim {
    0% { 
        transform: translate(-50%, -50%) scale(0) rotate(-360deg); 
        opacity: 0; 
    }
    50% { 
        transform: translate(-50%, -50%) scale(1.2) rotate(10deg); 
        opacity: 1; 
    }
    80% {
        transform: translate(-50%, -50%) scale(1) rotate(0deg);
    }
    100% { 
        transform: translate(-50%, -50%) scale(0.8); 
        opacity: 0; 
    }
}

@keyframes bossShake {
    0%, 100% { transform: rotate(0deg); }
    25% { transform: rotate(-10deg); }
    75% { transform: rotate(10deg); }
}

/* BOSS击败提示 */
.boss-defeat-popup {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: linear-gradient(135deg, #ffd700, #ff6b6b);
    padding: 40px 60px;
    border-radius: 20px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.5);
    animation: bossDefeatAnim 3s ease-out;
    pointer-events: none;
    z-index: 1004;
    text-align: center;
    border: 4px solid #fff;
}

.boss-defeat-icon {
    font-size: 5em;
    margin-bottom: 15px;
    animation: victoryRotate 1s ease-out;
}

.boss-defeat-text {
    font-size: 2.5em;
    font-weight: bold;
    color: #fff;
    text-shadow: 0 2px 4px rgba(0,0,0,0.3);
    margin-bottom: 10px;
}

.boss-defeat-bonus {
    font-size: 1.8em;
    color: #fff;
    font-weight: bold;
}

@keyframes bossDefeatAnim {
    0% { 
        transform: translate(-50%, -50%) scale(0); 
        opacity: 0; 
    }
    50% { 
        transform: translate(-50%, -50%) scale(1.2); 
        opacity: 1; 
    }
    80% {
        transform: translate(-50%, -50%) scale(1);
    }
    100% { 
        transform: translate(-50%, -50%) scale(0.8); 
        opacity: 0; 
    }
}

@keyframes victoryRotate {
    0% { transform: rotate(0deg) scale(0); }
    50% { transform: rotate(360deg) scale(1.3); }
    100% { transform: rotate(720deg) scale(1); }
}

/* 单词掌握提示 */
.word-mastered-popup {
    position: fixed;
    top: 20%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: linear-gradient(135deg, #4ecdc4, #44a08d);
    padding: 30px 50px;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
    animation: wordMasteredAnim 2s ease-out;
    pointer-events: none;
    z-index: 1003;
    text-align: center;
    border: 3px solid #fff;
}

.word-mastered-icon {
    font-size: 3em;
    margin-bottom: 10px;
}

.word-mastered-text {
    font-size: 1.3em;
    color: #fff;
    margin-bottom: 10px;
}

.word-mastered-word {
    font-size: 2em;
    font-weight: bold;
    color: #ffd700;
    text-shadow: 0 2px 4px rgba(0,0,0,0.3);
    margin-bottom: 5px;
}

.word-mastered-chinese {
    font-size: 1.5em;
    color: #fff;
}

@keyframes wordMasteredAnim {
    0% { 
        transform: translate(-50%, -50%) scale(0); 
        opacity: 0; 
    }
    30% { 
        transform: translate(-50%, -50%) scale(1.1); 
        opacity: 1; 
    }
    70% {
        transform: translate(-50%, -50%) scale(1);
    }
    100% { 
        transform: translate(-50%, -50%) scale(0.9); 
        opacity: 0; 
    }
}

/* 单词本完成提示 */
.wordbook-complete-popup {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: linear-gradient(135deg, #667eea, #764ba2);
    padding: 50px 70px;
    border-radius: 25px;
    box-shadow: 0 15px 50px rgba(0,0,0,0.5);
    z-index: 1005;
    text-align: center;
    border: 5px solid #ffd700;
    max-width: 500px;
}

.wordbook-complete-icon {
    font-size: 6em;
    margin-bottom: 20px;
    animation: victoryRotate 1.5s ease-out;
}

.wordbook-complete-title {
    font-size: 3em;
    font-weight: bold;
    color: #ffd700;
    text-shadow: 0 3px 6px rgba(0,0,0,0.3);
    margin-bottom: 15px;
}

.wordbook-complete-text {
    font-size: 1.5em;
    color: #fff;
    margin-bottom: 10px;
}

.wordbook-complete-name {
    font-size: 2em;
    font-weight: bold;
    color: #fff;
    text-shadow: 0 2px 4px rgba(0,0,0,0.3);
    margin-bottom: 30px;
}

.wordbook-complete-stats {
    display: flex;
    justify-content: space-around;
    margin-bottom: 30px;
    padding: 20px;
    background: rgba(255,255,255,0.1);
    border-radius: 15px;
}

.stat-item {
    text-align: center;
}

.stat-label {
    font-size: 1em;
    color: rgba(255,255,255,0.8);
    margin-bottom: 5px;
}

.stat-value {
    font-size: 2em;
    font-weight: bold;
    color: #ffd700;
}

.wordbook-complete-message {
    font-size: 1.3em;
    color: #fff;
    margin-bottom: 25px;
}

.wordbook-complete-btn {
    background: linear-gradient(45deg, #ffd700, #ffaa00);
    color: #333;
    border: none;
    padding: 15px 40px;
    font-size: 1.3em;
    font-weight: bold;
    border-radius: 25px;
    cursor: pointer;
    transition: transform 0.3s, box-shadow 0.3s;
    box-shadow: 0 5px 15px rgba(0,0,0,0.3);
}

.wordbook-complete-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(0,0,0,0.4);
}

.wordbook-complete-btn:active {
    transform: translateY(-1px);
}

/* 终极弹使用提示 */
.ultimate-used-popup {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: linear-gradient(135deg, #FF1493, #9B59B6, #4169E1);
    padding: 50px 70px;
    border-radius: 25px;
    box-shadow: 0 15px 50px rgba(0,0,0,0.7);
    animation: ultimateAnim 3s ease-out;
    pointer-events: none;
    z-index: 1006;
    text-align: center;
    border: 5px solid #FFD700;
}

.ultimate-icon {
    font-size: 6em;
    margin-bottom: 20px;
    animation: ultimateRotate 2s ease-out;
}

.ultimate-text {
    font-size: 3em;
    font-weight: bold;
    color: #FFD700;
    text-shadow: 0 0 20px rgba(255, 215, 0, 0.8);
    margin-bottom: 30px;
}

.ultimate-stats {
    font-size: 1.5em;
    color: #fff;
    line-height: 2;
}

.ultimate-stats div {
    margin: 10px 0;
}

@keyframes ultimateAnim {
    0% { 
        transform: translate(-50%, -50%) scale(0) rotate(-720deg); 
        opacity: 0; 
    }
    50% { 
        transform: translate(-50%, -50%) scale(1.3) rotate(0deg); 
        opacity: 1; 
    }
    80% {
        transform: translate(-50%, -50%) scale(1);
    }
    100% { 
        transform: translate(-50%, -50%) scale(0.9); 
        opacity: 0; 
    }
}

@keyframes ultimateRotate {
    0% { transform: rotate(0deg) scale(0); }
    50% { transform: rotate(720deg) scale(1.5); }
    100% { transform: rotate(1440deg) scale(1); }
}