/* ===========================================
   Responsive Design
   =========================================== */

@media (max-width: 640px) {
    .container {
        padding: 16px;
    }

    .header {
        padding: 24px 0;
    }

    .logo {
        font-size: 2rem;
    }

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

    .header p {
        font-size: 0.9rem;
    }

    /* Burger Menu Mobile */
    .header-actions {
        top: 10px;
        right: 10px;
        gap: 8px;
    }

    .burger-toggle {
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 5px;
        width: 36px;
        height: 36px;
        padding: 0;
        background: var(--bg-card);
        border: 1px solid var(--border-color);
        border-radius: var(--radius-md);
        cursor: pointer;
        z-index: 201;
        transition: all var(--transition-normal);
    }

    .burger-toggle:hover {
        border-color: var(--border-hover);
        background: var(--bg-card-hover);
    }

    .burger-bar {
        display: block;
        width: 18px;
        height: 2px;
        background: var(--text-secondary);
        border-radius: 1px;
        transition: all 0.3s ease;
        transform-origin: center;
    }

    .burger-toggle.open .burger-bar:nth-child(1) {
        transform: translateY(7px) rotate(45deg);
    }

    .burger-toggle.open .burger-bar:nth-child(2) {
        opacity: 0;
    }

    .burger-toggle.open .burger-bar:nth-child(3) {
        transform: translateY(-7px) rotate(-45deg);
    }

    /* Nav menu as dropdown panel */
    .nav-menu {
        display: none;
        position: absolute;
        top: calc(100% + 8px);
        right: 0;
        flex-direction: column;
        background: var(--bg-card);
        border: 1px solid var(--border-color);
        border-radius: var(--radius-md);
        box-shadow: var(--shadow-lg);
        min-width: 200px;
        padding: 8px 0;
        z-index: 200;
    }

    .nav-menu.open {
        display: flex;
    }

    /* Restore text labels in mobile menu */
    .nav-menu .api-link span {
        display: inline;
    }

    .nav-menu .api-link {
        padding: 10px 16px;
        border: none;
        border-radius: 0;
        background: transparent;
        opacity: 1;
        width: 100%;
        font-size: 0.85rem;
    }

    .nav-menu .api-link:hover {
        background: var(--bg-card-hover);
    }

    /* Auth avatar button in burger menu — show as full-width nav item */
    #navMenu .auth-user {
        width: 100%;
        border-bottom: 1px solid var(--border-color);
        padding-bottom: 4px;
        margin-bottom: 4px;
    }

    #navMenu .auth-avatar-btn {
        width: 100%;
        border-radius: 0;
        background: transparent;
        color: var(--text-primary);
        font-size: 0.85rem;
        font-weight: 500;
        justify-content: flex-start;
        padding: 10px 16px;
        gap: 10px;
        height: auto;
    }

    #navMenu .auth-avatar-btn:hover {
        background: var(--bg-card-hover);
    }

    #navMenu .auth-avatar-inner {
        width: 26px;
        height: 26px;
        min-width: 26px;
        border-radius: 50%;
        background: var(--accent-gradient);
        color: #fff;
        font-size: 0.78rem;
        font-weight: 700;
    }

    #navMenu .auth-nav-label {
        display: inline;
    }

    /* Language switcher inside menu */
    .nav-menu .lang-switcher {
        width: 100%;
        border-top: 1px solid var(--border-color);
        margin-top: 4px;
        padding-top: 4px;
    }

    .nav-menu .lang-current {
        width: 100%;
        border: none;
        border-radius: 0;
        padding: 10px 16px;
        font-size: 0.85rem;
    }

    .nav-menu .lang-current:hover {
        background: var(--bg-card-hover);
    }

    .nav-menu .lang-code {
        display: inline;
    }

    .nav-menu .lang-dropdown {
        position: static;
        display: none;
        opacity: 1;
        transform: none;
        box-shadow: none;
        border: none;
        border-top: 1px solid var(--border-color);
        border-radius: 0;
        width: 100%;
        max-height: 46vh;
    }

    .nav-menu .lang-switcher.open .lang-dropdown {
        display: flex;
    }

    .lang-option {
        padding: 8px 10px;
    }

    .lang-option .lang-name {
        font-size: 0.85rem;
    }

    .search-section {
        padding: 16px;
        border-radius: var(--radius-lg);
    }

    .search-form {
        flex-direction: column;
    }

    .input-wrapper input {
        padding: 14px 38px 14px 16px;
    }

    .btn-search {
        padding: 14px 24px;
        width: 100%;
    }

    .instructions {
        font-size: 0.8rem;
    }

    .track-card {
        padding: 12px;
        gap: 10px;
        flex-wrap: wrap;
    }

    .track-cover {
        width: 44px;
        height: 44px;
    }

    .track-title {
        font-size: 0.9rem;
    }

    .track-artist {
        font-size: 0.8rem;
    }

    .track-card > .track-platforms {
        width: 100%;
        margin-left: 0;
        padding-left: 54px;
        padding-top: 2px;
    }

    .original-track {
        padding: 16px;
        flex-direction: column;
        text-align: center;
    }

    .original-track .track-cover {
        width: 80px;
        height: 80px;
    }

    .results-header {
        flex-direction: column;
        gap: 8px;
        align-items: flex-start;
    }

    /* Info Sections Mobile */
    .info-section {
        padding: 20px 16px;
        margin-top: 24px;
    }

    .info-section h2 {
        font-size: 1rem;
    }

    .steps-grid {
        grid-template-columns: 1fr;
        gap: 12px;
    }

    .step-card {
        padding: 16px;
    }

    .step-icon {
        width: 36px;
        height: 36px;
        font-size: 0.9rem;
    }

    .features-list {
        grid-template-columns: 1fr;
        gap: 8px;
    }

    .features-list li {
        padding: 10px 14px;
        font-size: 0.8rem;
    }

    .faq-item h3 {
        font-size: 0.85rem;
        padding: 14px 16px;
    }

    .faq-answer {
        padding: 0 16px 14px;
    }

    .faq-answer p {
        font-size: 0.8rem;
    }

    .footer-tagline {
        font-size: 0.8rem;
    }

    /* 404 Page Mobile */
    .error-vinyl {
        width: 160px;
        height: 160px;
    }

    .vinyl-disc::before {
        width: 60px;
        height: 60px;
    }

    .vinyl-disc::after {
        font-size: 1rem;
    }

    .error-title {
        font-size: 1.5rem;
    }

    .secret-message {
        font-size: 0.75rem;
        padding: 10px 16px;
        max-width: 90vw;
        white-space: normal;
        text-align: center;
    }

    /* Share Section Mobile */
    .share-section {
        flex-direction: column;
        gap: 10px;
        padding: 14px;
    }

    .btn-share {
        width: 100%;
        justify-content: center;
        padding: 12px 18px;
    }

    .share-url {
        width: 100%;
        text-align: center;
        font-size: 0.75rem;
    }

    .share-cta {
        margin-bottom: 20px;
    }

    .btn-primary {
        width: 100%;
        justify-content: center;
        padding: 12px 24px;
        font-size: 0.9rem;
    }

    /* API Page Mobile */
    .api-form {
        padding: 24px 20px;
        margin-top: 24px;
    }

    .form-input,
    .form-textarea {
        padding: 12px 14px;
        font-size: 0.95rem;
    }

    .btn-submit {
        padding: 14px 20px;
    }

    .api-success {
        padding: 32px 20px;
    }

    /* Lyrics Mobile */
    .lyrics-card {
        padding: 12px;
        gap: 12px;
    }

    .lyrics-card__main {
        gap: 12px;
    }

    .lyrics-card__cover {
        width: 56px;
        height: 56px;
    }

    .lyrics-card__title {
        font-size: 0.9rem;
    }

    .lyrics-textarea {
        min-height: 70px;
        padding: 14px 16px;
    }

    .lyrics-card__actions {
        gap: 8px;
    }

    .lyrics-card__text {
        max-height: 300px;
        font-size: 0.8rem;
    }

    /* Similar Artists Mobile */
    .artist-result__header {
        gap: 12px;
        padding: 12px;
    }

    .artist-result__cover {
        width: 48px;
        height: 48px;
    }

    .artist-result--simple .artist-result__cover {
        width: 40px;
        height: 40px;
    }

    .artist-result__name {
        font-size: 0.9rem;
    }

    .artist-result__tracks {
        padding: 0 12px 12px;
    }

    .sa-track {
        gap: 8px;
    }

    .sa-track__cover {
        width: 36px;
        height: 36px;
    }

    .ac-dropdown {
        max-height: 240px;
    }

    .ac-item {
        padding: 8px 12px;
        gap: 10px;
    }

    .ac-img {
        width: 32px;
        height: 32px;
    }

    /* Platform Icons Mobile */
    .track-platforms {
        gap: 4px;
        padding-left: 8px;
    }

    .track-platform {
        width: 28px;
        height: 28px;
    }

    .track-platform svg {
        width: 14px;
        height: 14px;
    }

    /* Genre Finder */
    .gf-result-card {
        padding: 16px;
    }

    .gf-result-card__header {
        gap: 12px;
    }

    .gf-result-card__cover {
        width: 64px;
        height: 64px;
    }

    .gf-result-card__title {
        font-size: 1rem;
    }

    .gf-genres {
        gap: 6px;
    }

    .genre-badge {
        padding: 5px 12px;
        font-size: 0.8rem;
    }

    .gf-actions {
        flex-direction: column;
    }

    .gf-action-btn {
        width: 100%;
        justify-content: center;
    }

    .feedback-bar {
        flex-wrap: wrap;
        gap: 8px;
        justify-content: center;
    }

    .feedback-bar__label {
        width: 100%;
        text-align: center;
        margin-right: 0;
    }

    /* AI Pro CTA Mobile */
    .ai-pro-cta-inline {
        width: 100%;
        flex-direction: column;
        align-items: center;
        gap: 10px;
        margin-left: 0;
    }

    .ai-pro-cta-inline__text {
        text-align: center;
    }

    .ai-pro-cta-inline .ai-pro-cta__btn {
        width: 100%;
        justify-content: center;
    }

    .ai-pro-cta-inline--lyrics {
        flex-direction: column;
        text-align: center;
    }

    .ai-pro-cta-inline--lyrics .ai-pro-cta__btn {
        width: 100%;
        justify-content: center;
    }

    /* AI Pro Switcher Mobile */
    .ai-pro-switcher__tab {
        padding: 8px 10px;
        font-size: 0.82rem;
    }

    /* AI Limit Bar Mobile */
    .ai-limit-bar {
        flex-direction: column;
        gap: 6px;
    }

    .ai-limit-bar__counter {
        white-space: normal;
    }

    .ai-pro-card {
        flex-direction: column;
        text-align: center;
        align-items: center;
    }

    .ai-pro-card__platforms {
        justify-content: center;
    }

    .ai-pro-original {
        flex-direction: column;
        text-align: center;
    }

    .ai-pro-original .track-cover {
        width: 80px;
        height: 80px;
    }

    .ai-pro-original .ai-pro-card__platforms {
        justify-content: center;
    }

    /* Pricing Page Mobile */
    .pricing-grid,
    .pricing-grid--two {
        grid-template-columns: 1fr;
        gap: 16px;
        max-width: 100%;
    }

    /* Hide yearly placeholder on mobile (no need for spacing) */
    .pricing-card__yearly--placeholder {
        display: none;
    }

    .pricing-card {
        padding: 24px 20px;
    }

    .pricing-card__amount {
        font-size: 2rem;
    }

    .pricing-card__features li {
        font-size: 0.8rem;
    }
}