/* 防止页面加载闪烁 */
html.loading * {
    visibility: hidden !important;
}

/* 隐藏底部渐变条 */
body::after {
    content: '';
    display: none;
}

* {
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* 小屏幕优化 */
@media (max-width: 375px) {
    html {
        font-size: 14px;
    }
    
    body {
        font-size: 14px;
    }
}

/* 触摸设备优化 */
@media (hover: none) and (pointer: coarse) {
    button, a {
        min-height: 44px;
        min-width: 44px;
    }
}

/* 隐藏滚动条 */
::-webkit-scrollbar {
    width: 0px;
    height: 0px;
    display: none;
}
::-webkit-scrollbar-track {
    display: none;
}
::-webkit-scrollbar-thumb {
    display: none;
}

/* Firefox滚动条隐藏 */
* {
    scrollbar-width: none;
    -ms-overflow-style: none;
}

/* 唱片旋转动画 */
@keyframes spin-record {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}
.animate-spin-record {
    animation: spin-record 10s linear infinite;
}

/* 闪烁动画 */
@keyframes blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}
.animate-blink {
    animation: blink 2s infinite;
}

/* 脉冲动画 - 已禁用以避免闪烁 */
@keyframes pulse-ring {
    0% { transform: scale(0.8); opacity: 0.8; }
    80%, 100% { opacity: 0; transform: scale(2); }
}
.pulse-ring {
    position: absolute;
    border-radius: 50%;
    /* animation: pulse-ring 2s cubic-bezier(0.215, 0.61, 0.355, 1) infinite; */
}

/* 自定义工具类 */
.text-shadow {
    text-shadow: 0 2px 4px rgba(0,0,0,0.1);
}
.text-shadow-lg {
    text-shadow: 0 4px 8px rgba(0,0,0,0.2);
}
.bg-gradient-primary {
    background: linear-gradient(135deg, #6366f1, #ec4899);
}
.bg-glass {
    background: rgba(255, 255, 255, 0.25);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.18);
}
.transition-all-300 {
    transition: all 0.3s ease;
}

/* 唱片旋转动画 */
@keyframes spin-record {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}
.animate-spin-record {
    animation: spin-record 10s linear infinite;
}

/* 闪烁动画 */
@keyframes blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}
.animate-blink {
    animation: blink 2s infinite;
}

/* 脉冲动画 - 已禁用以避免闪烁 */
@keyframes pulse-ring {
    0% { transform: scale(0.8); opacity: 0.8; }
    80%, 100% { opacity: 0; transform: scale(2); }
}
.pulse-ring {
    position: absolute;
    border-radius: 50%;
    /* animation: pulse-ring 2s cubic-bezier(0.215, 0.61, 0.355, 1) infinite; */
}

/* 选项按钮悬停效果 */
.option-btn:hover {
    transform: translateX(10px);
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.3);
}

/* 选项按钮选中效果 */
.option-btn.selected {
    background: linear-gradient(135deg, #6366f1, #ec4899);
    color: white;
    border-color: #6366f1;
}

/* 选项按钮正确答案效果 */
.option-btn.correct {
    background: linear-gradient(135deg, #10b981, #059669);
    border-color: #10b981;
}

/* 选项按钮错误答案效果 */
.option-btn.incorrect {
    background: linear-gradient(135deg, #ef4444, #dc2626);
    border-color: #ef4444;
}

/* 进度条动画 */
@keyframes progress {
    from { width: 0%; }
    to { width: 100%; }
}

/* 倒计时动画 */
@keyframes countdown {
    0% { color: #ec4899; }
    50% { color: #f43f5e; }
    100% { color: #ef4444; }
}
.timer-warning {
    animation: countdown 1s ease-in-out infinite;
}

/* 结果页面动画 */
@keyframes result-appear {
    from {
        opacity: 0;
        transform: translateY(50px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}
.result-animation {
    animation: result-appear 0.8s ease-out;
}

/* 模态框动画 */
@keyframes modal-appear {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}
.modal-animation {
    animation: modal-appear 0.3s ease-out;
}

/* 按钮点击波纹效果 */
.btn-ripple {
    position: relative;
    overflow: hidden;
}
.btn-ripple::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}
.btn-ripple:active::before {
    width: 300px;
    height: 300px;
}

/* 加载动画 */
@keyframes loading {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}
.loading-spinner {
    border: 4px solid rgba(255, 255, 255, 0.3);
    border-top: 4px solid #6366f1;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: loading 1s linear infinite;
}

/* 分类标签样式 */
.category-tag {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* 难度标签样式 */
.difficulty-easy { background: linear-gradient(135deg, #10b981, #059669); }
.difficulty-medium { background: linear-gradient(135deg, #f59e0b, #d97706); }
.difficulty-hard { background: linear-gradient(135deg, #ef4444, #dc2626); }

/* 响应式设计 */
@media (max-width: 768px) {
    .container {
        padding-left: 16px;
        padding-right: 16px;
    }
    
    h1 {
        font-size: 2.5rem !important;
    }
    
    .option-btn {
        font-size: 1rem;
        padding: 12px 16px;
    }
    
    .pulse-ring {
        width: 120px !important;
        height: 120px !important;
    }
}

/* 深色模式增强 */
@media (prefers-color-scheme: dark) {
    .bg-gray-900 {
        background-color: #0f172a;
    }
    
    .bg-gray-800 {
        background-color: #1e293b;
    }
    
    .bg-gray-700 {
        background-color: #334155;
    }
}

/* 打印样式 */
@media print {
    body {
        background: white;
        color: black;
    }
    
    .fixed, .absolute {
        display: none;
    }
    
    .container {
        max-width: 100%;
    }
}