:root {
    --glass-bg: rgba(255, 255, 255, 0.1);
    --glass-border: rgba(255, 255, 255, 0.2);
    --white-90: rgba(255, 255, 255, 0.9);
    --black-10: rgba(0, 0, 0, 0.1);
    --text-primary: rgba(0, 0, 0, 0.85);
    --text-secondary: rgba(0, 0, 0, 0.6);
    --shadow: rgba(0, 0, 0, 0.1);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: linear-gradient(135deg, #f5f7fa 0%, #e4e8ec 100%);
    min-height: 100vh;
    color: var(--text-primary);
}

/* 毛玻璃效果 */
.glass {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    box-shadow: 0 8px 32px 0 var(--shadow);
}

/* iOS风格按钮 */
.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 12px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.btn:active {
    transform: scale(0.95);
    transition: transform 0.1s cubic-bezier(0.4, 0, 0.2, 1);
}

.btn-primary {
    background: linear-gradient(135deg, var(--white-90) 0%, rgba(240, 240, 240, 0.9) 100%);
    color: var(--text-primary);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 24px var(--shadow);
}

.btn-secondary {
    background: rgba(200, 200, 200, 0.3);
    color: var(--text-primary);
}

/* 果冻回弹动画 */
@keyframes jelly {
    0%, 100% { transform: scale(1); }
    25% { transform: scale(0.95); }
    50% { transform: scale(1.05); }
    75% { transform: scale(0.98); }
}

.jelly {
    animation: jelly 0.5s cubic-bezier(0.36, 0.07, 0.19, 0.97);
}

/* 输入框 */
.input {
    width: 100%;
    padding: 14px 18px;
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    font-size: 16px;
    background: var(--white-90);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    color: var(--text-primary);
}

.input:focus {
    outline: none;
    border-color: rgba(0, 122, 255, 0.5);
    box-shadow: 0 0 0 4px rgba(0, 122, 255, 0.1);
    transform: translateY(-1px);
}

/* 卡片 */
.card {
    background: var(--white-90);
    border-radius: 20px;
    padding: 24px;
    margin: 16px 0;
    box-shadow: 0 4px 16px var(--shadow);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 32px var(--shadow);
}

/* 开关按钮 */
.switch {
    position: relative;
    display: inline-block;
    width: 51px;
    height: 31px;
}

.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(120, 120, 128, 0.16);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border-radius: 31px;
}

.slider:before {
    position: absolute;
    content: "";
    height: 27px;
    width: 27px;
    left: 2px;
    bottom: 2px;
    background-color: white;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border-radius: 50%;
    box-shadow: 0 3px 8px rgba(0, 0, 0, 0.15), 0 3px 1px rgba(0, 0, 0, 0.06);
}

input:checked + .slider {
    background-color: #34c759;
}

input:checked + .slider:before {
    transform: translateX(20px);
}

/* 响应式布局 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* 手机端 */
@media (max-width: 768px) {
    .container {
        padding: 12px;
    }
    
    .card {
        padding: 16px;
        border-radius: 16px;
    }
    
    .btn {
        padding: 10px 20px;
        font-size: 14px;
    }
}

/* 平板端 */
@media (min-width: 769px) and (max-width: 1024px) {
    .container {
        max-width: 900px;
    }
}

/* PC端 */
@media (min-width: 1025px) {
    .container {
        max-width: 1200px;
    }
}

/* 加载动画 */
.spinner {
    border: 3px solid rgba(0, 0, 0, 0.1);
    border-top: 3px solid var(--text-primary);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s cubic-bezier(0.4, 0, 0.2, 1) infinite;
}

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

/* 淡入动画 */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeIn 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 模态框 */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(10px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    animation: fadeIn 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.modal-content {
    background: var(--white-90);
    border-radius: 20px;
    padding: 32px;
    max-width: 90%;
    max-height: 90%;
    overflow-y: auto;
    animation: jelly 0.5s cubic-bezier(0.36, 0.07, 0.19, 0.97);
}

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

::-webkit-scrollbar-track {
    background: rgba(0, 0, 0, 0.05);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb {
    background: rgba(0, 0, 0, 0.2);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(0, 0, 0, 0.3);
}