/* 全局样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html, body {
    width: 100%;
    height: 100%;
    overflow: hidden;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
}

/* 3D背景画布 */
#bg-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    background: linear-gradient(135deg, #e3f2fd 0%, #ffffff 50%, #f0f8ff 100%);
}

/* 主内容容器 */
.main-container {
    position: relative;
    z-index: 10;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

/* Logo容器 */
.logo-container {
    margin-bottom: 60px;
    animation: fadeInDown 1s ease-out;
}

.logo-container img {
    max-width: 200px;
    max-height: 120px;
    width: auto;
    height: auto;
    filter: drop-shadow(0 4px 20px rgba(0, 102, 204, 0.2));
}

/* 按钮容器 */
.button-container {
    display: flex;
    flex-direction: column;
    gap: 20px;
    width: 100%;
    max-width: 320px;
    animation: fadeInUp 1s ease-out 0.3s both;
}

/* 按钮样式 */
.btn {
    padding: 16px 40px;
    font-size: 16px;
    font-weight: 500;
    border: none;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: center;
    letter-spacing: 1px;
}

.btn-primary {
    background: linear-gradient(135deg, #4a90e2 0%, #357abd 100%);
    color: #ffffff;
    box-shadow: 0 4px 15px rgba(74, 144, 226, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 25px rgba(74, 144, 226, 0.5);
}

.btn-secondary {
    background: #ffffff;
    color: #4a90e2;
    border: 2px solid #4a90e2;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.btn-secondary:hover {
    background: #4a90e2;
    color: #ffffff;
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(74, 144, 226, 0.3);
}

.btn-close {
    background: #f5f5f5;
    color: #666;
    padding: 10px 30px;
    font-size: 14px;
}

.btn-close:hover {
    background: #e0e0e0;
}

/* 弹窗样式 */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(5px);
    z-index: 100;
    display: none;
    justify-content: center;
    align-items: center;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.modal-overlay.active {
    display: flex;
    opacity: 1;
}

.modal-content {
    background: #ffffff;
    border-radius: 20px;
    width: 90%;
    max-width: 500px;
    max-height: 80vh;
    overflow: hidden;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.2);
    transform: scale(0.9);
    transition: transform 0.3s ease;
}

.modal-overlay.active .modal-content {
    transform: scale(1);
}

.modal-header {
    padding: 20px 25px;
    border-bottom: 1px solid #f0f0f0;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h3 {
    font-size: 18px;
    color: #333;
    font-weight: 600;
}

.modal-close {
    background: none;
    border: none;
    font-size: 28px;
    color: #999;
    cursor: pointer;
    line-height: 1;
    padding: 0;
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: all 0.2s;
}

.modal-close:hover {
    background: #f5f5f5;
    color: #333;
}

.modal-body {
    padding: 25px;
    max-height: 50vh;
    overflow-y: auto;
}

.modal-body::-webkit-scrollbar {
    width: 6px;
}

.modal-body::-webkit-scrollbar-track {
    background: #f1f1f1;
    border-radius: 3px;
}

.modal-body::-webkit-scrollbar-thumb {
    background: #c1c1c1;
    border-radius: 3px;
}

.popup-item {
    padding: 15px;
    margin-bottom: 15px;
    background: #f8f9fa;
    border-radius: 12px;
    line-height: 1.6;
    font-size: 15px;
    animation: slideIn 0.4s ease-out;
    border-left: 4px solid #4a90e2;
}

.popup-item:last-child {
    margin-bottom: 0;
}

.modal-footer {
    padding: 15px 25px;
    border-top: 1px solid #f0f0f0;
    text-align: center;
}

/* 动画效果 */
@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

/* 响应式设计 */
@media (max-width: 480px) {
    .logo-container img {
        max-width: 150px;
    }
    
    .button-container {
        max-width: 280px;
    }
    
    .btn {
        padding: 14px 30px;
        font-size: 15px;
    }
    
    .modal-content {
        width: 95%;
    }
}

/* 加载状态 */
.loading {
    text-align: center;
    color: #999;
    padding: 20px;
}