/* 手机设备 */
@media (max-width: 768px) {
    body {
        padding: 10px;
    }

    nav {
        flex-direction: column;
        padding: 15px;
        gap: 15px;
    }

    .nav-links {
        width: 100%;
        overflow-x: auto;
        padding-bottom: 10px;
        justify-content: flex-start;
    }

        .nav-links li {
            flex-shrink: 0;
        }

    .user-status {
        width: 100%;
        justify-content: space-between;
    }

    .container {
        grid-template-columns: 1fr;
    }

    .card {
        padding: 20px;
    }

    .modal-content {
        padding: 20px;
    }

    .calendar-day {
        padding: 8px 2px;
        min-height: 40px;
        font-size: 0.9rem;
    }

    .friends-list {
        grid-template-columns: 1fr;
    }

    .quick-stats {
        grid-template-columns: 1fr;
    }

    .welcome-image {
        display: none;
    }
}

/* 小屏幕手机 */
@media (max-width: 480px) {
    h2 {
        font-size: 1.3rem;
    }

    .logo {
        font-size: 1.5rem;
    }

        .logo i {
            font-size: 1.7rem;
        }

    .nav-links a {
        padding: 8px 12px;
        font-size: 0.9rem;
    }

    .login-btn, .logout-btn {
        padding: 8px 12px;
        font-size: 0.9rem;
    }

    .tab {
        padding: 10px 15px;
        font-size: 0.9rem;
    }

    .stat-card {
        padding: 15px;
    }

        .stat-card p {
            font-size: 1.5rem;
        }

    .birthday-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }

    .days-until {
        align-self: flex-end;
    }

    .date-filter {
        width: 100%;
    }
}

/* 高对比度模式 */
@media (prefers-contrast: high) {
    :root {
        --glass-color: rgba(255, 255, 255, 0.9);
        --text-color: #000;
    }

    .glass {
        border: 2px solid var(--accent-color);
    }
}

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