/* 响应式设计 */

/* 大屏幕 (1200px以上) */
@media (min-width: 1200px) {
    .container {
        max-width: 1140px;
    }
}

/* 中等屏幕 (992px - 1199px) */
@media (max-width: 1199px) {
    .main-content {
        padding: 15px;
    }
    
    .sidebar {
        width: 220px;
    }
    
    .exam-card {
        width: 250px;
    }
}

/* 平板 (768px - 991px) */
@media (max-width: 991px) {
    .main-content {
        flex-direction: column;
    }
    
    .sidebar {
        width: 100%;
        margin-right: 0;
        margin-bottom: 20px;
    }
    
    .main-nav ul {
        display: flex;
        overflow-x: auto;
        padding: 10px 0;
    }
    
    .nav-link {
        border-left: none;
        border-bottom: 3px solid transparent;
        white-space: nowrap;
    }
    
    .nav-link.active {
        border-left: none;
        border-bottom-color: var(--primary-color);
    }
    
    .header-content {
        flex-direction: column;
        gap: 15px;
    }
    
    .user-info {
        width: 100%;
        justify-content: space-between;
    }
    
    .exam-options {
        flex-direction: column;
        align-items: center;
    }
    
    .exam-card {
        width: 100%;
        max-width: 400px;
    }
    
    .payment-options {
        flex-direction: column;
    }
    
    .payment-option {
        min-width: 100%;
    }
}

/* 手机 (576px - 767px) */
@media (max-width: 767px) {
    .auth-form {
        padding: 25px 15px;
    }
    
    .main-header {
        padding: 1rem;
    }
    
    .logo-section h1 {
        font-size: 1.2rem;
    }
    
    .user-status {
        flex-direction: column;
        align-items: flex-start;
        gap: 5px;
    }
    
    .expiry-status {
        font-size: 0.8rem;
    }
    
    .content-area {
        padding: 15px;
    }
    
    .filter-group {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .type-controls {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .number-controls {
        width: 100%;
    }
    
    .number-controls input {
        flex: 1;
    }
    
    .question-card {
        padding: 15px;
    }
    
    .question-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }
    
    .exam-header {
        flex-direction: column;
        gap: 15px;
        text-align: center;
    }
    
    .modal-content {
        width: 95%;
        margin: 10px;
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
        gap: 30px;
    }
    
    .footer-info p {
        justify-content: center;
    }
}

/* 小手机 (小于576px) */
@media (max-width: 575px) {
    .auth-tabs {
        width: 100%;
    }
    
    .auth-tab {
        padding: 12px 10px;
        font-size: 0.85rem;
    }
    
    .logo-section h1 {
        font-size: 1rem;
    }
    
    .user-menu-btn {
        padding: 8px 12px;
        font-size: 0.9rem;
    }
    
    .nav-link {
        padding: 10px 15px;
        font-size: 0.9rem;
    }
    
    .btn {
        padding: 8px 15px;
        font-size: 0.9rem;
    }
    
    .question-type {
        font-size: 0.8rem;
        padding: 3px 10px;
    }
    
    .timer {
        font-size: 1.2rem;
        padding: 8px 15px;
    }
    
    .method-btn {
        padding: 12px;
        font-size: 1rem;
    }
    
    .qrcode-placeholder {
        font-size: 4rem;
    }
}

/* 打印样式 */
@media print {
    .main-header,
    .sidebar,
    .main-footer,
    .practice-controls,
    .exam-submit,
    .user-menu,
    .nav-link:not(.active) {
        display: none !important;
    }
    
    .main-content {
        display: block;
        padding: 0;
    }
    
    .content-area {
        box-shadow: none;
        border: none;
        padding: 0;
    }
    
    .question-card {
        break-inside: avoid;
        page-break-inside: avoid;
        border: 1px solid #000;
        margin-bottom: 20px;
    }
    
    body {
        background: white !important;
    }
}

/* 深色模式支持 */
@media (prefers-color-scheme: dark) {
    :root {
        --dark-color: #f8f9fa;
        --light-color: #343a40;
        --gray-color: #adb5bd;
    }
    
    body {
        background: linear-gradient(135deg, #495057 0%, #212529 100%);
        color: var(--dark-color);
    }
    
    .auth-form,
    .modal-content,
    .sidebar,
    .content-area,
    .question-card,
    .exam-card,
    .payment-option {
        background: #343a40;
        color: var(--dark-color);
    }
    
    .form-group input,
    .code-editor,
    .form-control {
        background: #495057;
        border-color: #6c757d;
        color: var(--dark-color);
    }
    
    .option-item {
        background: #495057;
    }
    
    .password-requirements {
        background: #495057;
    }
    
    .nav-link:hover,
    .nav-link.active {
        background: #495057;
    }
}

/* 高对比度模式 */
@media (prefers-contrast: high) {
    :root {
        --primary-color: #0000ff;
        --secondary-color: #008000;
        --danger-color: #ff0000;
        --warning-color: #ffa500;
    }
    
    .btn {
        border: 2px solid currentColor;
    }
    
    .form-group input {
        border: 2px solid #000;
    }
}

/* 减少动画 */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* 在原有的响应式CSS中添加以下内容 */

/* 平板 (768px - 991px) */
@media (max-width: 991px) {
    /* 保持原有样式不变，添加以下调整 */
    .exam-timer-container {
        position: sticky;
        top: 60px;
        right: auto;
        left: 50%;
        transform: translateX(-50%);
        width: auto;
        margin: 10px auto;
        z-index: 1000;
    }
    
    .sidebar.fixed {
        position: relative !important;
        top: 0 !important;
        left: 0 !important;
        height: auto !important;
    }
    
    .main-content {
        padding-left: 20px !important;
    }
}

/* 手机 (576px - 767px) */
@media (max-width: 767px) {
    .exam-timer-container {
        padding: 10px 15px;
        font-size: 0.9rem;
        top: 50px;
    }
    
    .timer-value {
        font-size: 1.2rem;
    }
    
    .sidebar {
        position: relative;
        width: 100%;
        margin: 0 0 20px 0;
        height: auto;
    }
    
    .main-content {
        padding: 15px !important;
    }
}

/* 小手机 (小于576px) */
@media (max-width: 575px) {
    .exam-timer-container {
        padding: 8px 12px;
        top: 45px;
    }
    
    .timer-value {
        font-size: 1.1rem;
    }
    
    .timer-label {
        font-size: 0.8rem;
    }
}