@media (max-width: 1024px) {
    .nav-container { max-width: 95%; }
}

@media (max-width: 768px) {
    .nav-toggle { display: block; }
    .nav-right-area {
        position: absolute;
        top: 60px;
        left: 0;
        right: 0;
        background: var(--bg-nav);
        box-shadow: var(--shadow-nav);
        flex-direction: column;
        padding: 12px var(--spacing-md);
        display: none;
        z-index: 999;
    }
    .nav-right-area.nav-open { display: flex; }
    .nav-links { flex-direction: column; width: 100%; }
    .nav-links a { margin-right: 0; padding: var(--spacing-sm) 0; font-size: 14px; border-bottom: 1px solid var(--border-light); }
    .nav-links a:last-child { border-bottom: none; }
    .lang-switch { margin-top: var(--spacing-sm); padding-top: var(--spacing-sm); border-top: 1px solid var(--border-light); }
    .content-card { padding: var(--spacing-md); }
    .main-container { margin: 12px auto; }
    .page-title { font-size: 1.25rem; }
    .page-subtitle { font-size: 0.85rem; margin-bottom: 12px; }
    .input-group { flex-wrap: wrap; }
    .url-input { min-width: 100%; order: 1; }
    .paste-btn { order: 2; }
    .play-btn { order: 3; flex: 1; }
    .play-btn { padding: 10px 20px; }
    .cookie-content { flex-direction: column; text-align: center; }
    .player-controls-bar { flex-direction: column; align-items: stretch; }
    .share-section { justify-content: center; }
    .tools-bar { justify-content: center; margin-top: var(--spacing-sm); }
    .tool-btn { padding: 6px 10px; font-size: 12px; }
    .modal-box { padding: var(--spacing-md); max-width: 95%; margin: 0 10px; }
    .modal-title { font-size: var(--spacing-lg); }
    .modal-embed-code { font-size: 11px; min-height: 60px; }
    .drag-overlay-content { padding: var(--spacing-lg) 32px; }
    .drag-overlay-icon { font-size: 36px; }
    .drag-overlay-text { font-size: var(--spacing-lg); }
    .drag-overlay-hint { font-size: 13px; }
    .history-header { flex-direction: column; align-items: flex-start; gap: 6px; }
    .clear-history-btn { align-self: flex-end; }
    .faq-grid { grid-template-columns: 1fr; }
    .faq-item { padding: var(--spacing-md); }
    .faq-summary { padding: 14px var(--spacing-md); font-size: var(--font-size-base); }
    .faq-answer { padding: 14px var(--spacing-md); }
    .info-section { padding: var(--spacing-md); margin-bottom: 20px; }
    .info-section h2 { font-size: 1.15rem; }
    .breadcrumb { font-size: 0.75rem; }
    .history-header .history-actions { display: flex; gap: var(--spacing-sm); }
}

@media (max-width: 480px) {
    .nav-container { max-width: 100%; padding: 0 var(--spacing-sm); }
    .brand { font-size: var(--spacing-lg); }
    .content-card { padding: 12px; border-radius: var(--radius-md); }
    .page-title { font-size: 1.1rem; }
    .page-subtitle { font-size: 0.8rem; }
    .play-btn { padding: 10px var(--spacing-md); font-size: 14px; }
    .url-input { padding: 10px; font-size: 13px; }
    .paste-btn { padding: 10px 12px; }
    .subtitle-toggle { font-size: 12px; }
    .subtitle-input-group { flex-direction: column; }
    .subtitle-input { padding: var(--spacing-sm) 10px; font-size: 12px; }
    .subtitle-btn { padding: var(--spacing-sm) 12px; font-size: 12px; }
    .share-section { gap: 4px; }
    .share-btn { padding: 4px var(--spacing-sm); font-size: 11px; }
    .tools-bar { gap: 4px; flex-wrap: wrap; }
    .tool-btn { padding: 4px var(--spacing-sm); font-size: 11px; }
    .tool-btn .tool-icon { font-size: 12px; }
    .feature-grid { gap: 6px; }
    .feature-item { font-size: 12px; padding: 5px 10px; }
    .dark-toggle { margin-left: 6px; padding: 4px 6px; font-size: 14px; }
    .history-title { font-size: 14px; }
    .history-search-input { font-size: 12px; padding: 6px var(--spacing-sm); }
    .history-item { padding: 6px 10px; }
    .history-url { font-size: 12px; }
    .modal-box { padding: 12px; }
    .modal-title { font-size: 15px; margin-bottom: 12px; }
    .modal-embed-code { font-size: 10px; padding: var(--spacing-sm); }
    .modal-copy-btn { padding: 6px var(--spacing-md); font-size: 13px; width: 100%; }
    .modal-hint { font-size: 12px; }
    .modal-qr-img { max-width: 160px; }
    .modal-close { top: var(--spacing-sm); right: var(--spacing-sm); font-size: 20px; }
    .drag-overlay-content { padding: 20px var(--spacing-lg); border-radius: var(--radius-lg); }
    .drag-overlay-icon { font-size: 32px; }
    .drag-overlay-text { font-size: 14px; }
    .drag-overlay-hint { font-size: 12px; }
    .cookie-buttons { flex-direction: column; width: 100%; }
    .cookie-btn { width: 100%; text-align: center; }
    .faq-item { padding: 12px; }
    .faq-summary { padding: 12px 14px; font-size: 0.95rem; }
    .faq-answer { padding: 12px 14px; font-size: 0.9rem; }
    .info-section { padding: 12px; margin-bottom: var(--spacing-md); }
    .info-section h2 { font-size: 1.05rem; padding-left: 10px; border-left-width: 4px; }
    .info-section p { font-size: 0.9rem; }
    .info-section ul, .info-section ol { padding-left: var(--spacing-md); }
    .footer-links { gap: 10px; }
    .footer-links a { font-size: 0.8rem; }
    .page-footer { margin-top: var(--spacing-lg); padding-top: var(--spacing-md); }
    .illustration { padding: var(--spacing-sm) 0; margin: 12px auto; }
    .breadcrumb { font-size: 0.7rem; margin-bottom: 10px; }
    .comparison-table th, .comparison-table td { padding: 6px; font-size: 0.85rem; }
}

@media (max-width: 360px) {
    .content-card { padding: var(--spacing-sm); }
    .page-title { font-size: var(--font-size-base); }
    .page-subtitle { display: none; }
    .brand { font-size: 14px; }
    .lang-switch { font-size: 12px; }
    .share-btn { padding: 3px 6px; font-size: 10px; }
    .tool-btn { padding: 6px var(--spacing-sm); font-size: 10px; }
    .tool-label { display: none; }
    .feature-item { font-size: 11px; padding: 4px var(--spacing-sm); }
    .faq-item { padding: 10px; }
    .faq-summary { padding: 10px 12px; font-size: 0.9rem; }
    .faq-answer { padding: 10px 12px; font-size: 0.85rem; }
    .info-section { padding: 10px; }
    .info-section h2 { font-size: var(--font-size-base); }
    .footer-links { gap: var(--spacing-sm); }
    .footer-links a { font-size: 0.75rem; }
    .page-footer { margin-top: 20px; padding-top: 12px; }
}

@media (min-width: 1200px) {
    .main-container { max-width: 900px; }
    .content-card { padding: var(--spacing-xl); }
    .page-title { font-size: var(--font-size-2xl); }
    .page-subtitle { font-size: var(--font-size-base); }
    .url-input { padding: 12px 14px; font-size: 15px; }
    .play-btn { padding: 12px 28px; font-size: 15px; }
    .paste-btn { padding: 12px 14px; font-size: 18px; }
    .share-btn { padding: 6px 14px; font-size: 13px; }
    .tool-btn { padding: 6px 14px; font-size: 13px; }
    .feature-item { padding: var(--spacing-sm) var(--spacing-md); font-size: 14px; }
    .history-title { font-size: 18px; }
    .history-url { font-size: 14px; }
}

@media (min-width: 1441px) {
    .main-container { max-width: 960px; }
}