/* ===========================
   响应式设计
   =========================== */

/* 平板设备 (768px 及以下) */
@media (max-width: 768px) {
    .navbar .container {
        flex-direction: column;
        gap: 1rem;
    }

    .navbar-menu {
        flex-direction: column;
        gap: 0.5rem;
        width: 100%;
    }

    .navbar-menu a {
        display: block;
        padding: 0.5rem 0;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .hero p {
        font-size: 1rem;
    }

    .hero-buttons {
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }

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

    .file-item {
        flex-direction: column;
        align-items: flex-start;
    }

    .file-actions {
        width: 100%;
        margin-top: 1rem;
    }

    .result-stats {
        grid-template-columns: repeat(2, 1fr);
    }

    .footer-content {
        grid-template-columns: 1fr;
    }
}

/* 手机设备 (480px 及以下) */
@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }

    .logo {
        font-size: 1.25rem;
    }

    .logo-icon {
        font-size: 1.5rem;
    }

    .hero {
        padding: 2rem 0;
    }

    .hero h1 {
        font-size: 1.5rem;
    }

    .hero p {
        font-size: 0.95rem;
    }

    .tool-section {
        padding: 1.5rem;
    }

    .tool-section h2 {
        font-size: 1.5rem;
    }

    .upload-area {
        padding: 1.5rem;
    }

    .upload-icon {
        font-size: 2rem;
    }

    .upload-text {
        font-size: 1rem;
    }

    .upload-hint {
        font-size: 0.85rem;
    }

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

    .stat {
        padding: 0.75rem;
    }

    .stat-value {
        font-size: 1.25rem;
    }

    .btn {
        padding: 0.65rem 1.25rem;
        font-size: 0.95rem;
    }

    .file-item {
        padding: 0.75rem;
    }

    .file-icon {
        font-size: 1.25rem;
    }

    .file-name {
        font-size: 0.95rem;
    }

    .file-size {
        font-size: 0.85rem;
    }

    .btn-remove {
        padding: 0.4rem 0.8rem;
        font-size: 0.85rem;
    }

    .footer-section h3 {
        font-size: 1rem;
    }

    .footer-section a {
        font-size: 0.95rem;
    }
}

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

    .grid-2 {
        grid-template-columns: repeat(2, 1fr);
    }

    .grid-3 {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* 打印样式 */
@media print {
    .navbar,
    .footer,
    .btn,
    .upload-area {
        display: none;
    }

    body {
        background-color: white;
    }

    .tool-section {
        box-shadow: none;
        border: 1px solid var(--border-color);
    }
}

/* 深色模式支持 */
@media (prefers-color-scheme: dark) {
    :root {
        --text-dark: #f3f4f6;
        --text-light: #d1d5db;
        --bg-light: #1f2937;
        --bg-white: #111827;
        --border-color: #374151;
    }

    .header {
        background-color: var(--bg-white);
        border-bottom: 1px solid var(--border-color);
    }

    .upload-area {
        background-color: rgba(0, 102, 204, 0.05);
    }

    .upload-area:hover {
        background-color: rgba(0, 102, 204, 0.1);
    }

    .file-item,
    .stat {
        background-color: var(--bg-light);
    }

    .result-item {
        background-color: var(--bg-light);
    }
}

/* 高对比度模式 */
@media (prefers-contrast: more) {
    .btn {
        border: 2px solid currentColor;
    }

    .upload-area {
        border-width: 3px;
    }

    .file-item {
        border: 1px solid var(--border-color);
    }
}

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