:root {
    --primary-color: #7C3AED;
    --primary-gradient: linear-gradient(135deg, #7C3AED 0%, #4F46E5 100%);
    --background-color: #0F172A;
    --card-bg: rgba(30, 41, 59, 0.7);
    --text-primary: #F8FAFC;
    --text-secondary: #94A3B8;
    --hover-color: rgba(51, 65, 85, 0.7);
    --accent-color: #F472B6;
    --success-color: #10B981;
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    --shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
    --card-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
}

[data-theme="light"] {
    --background-color: #F1F5F9;
    --card-bg: rgba(255, 255, 255, 0.7);
    --text-primary: #1E293B;
    --text-secondary: #64748B;
    --hover-color: rgba(226, 232, 240, 0.7);
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(0, 0, 0, 0.1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes slideIn {
    from { transform: translateX(-20px); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}

body {
    background-color: var(--background-color);
    color: var(--text-primary);
    min-height: 100vh;
    transition: all 0.5s ease;
    background-image: 
        radial-gradient(circle at 25% 25%, rgba(124, 58, 237, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 75% 75%, rgba(79, 70, 229, 0.1) 0%, transparent 50%);
}

.app-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    animation: fadeIn 0.5s ease-out;
}

.main-header {
    background: var(--background-color);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.main-nav ul {
    display: flex;
    gap: 2rem;
    list-style: none;
    margin: 0;
    padding: 0;
}

.main-nav a {
    color: var(--text-color);
    text-decoration: none;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.main-nav a:hover,
.main-nav a.active {
    background: var(--primary-color);
    color: white;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.theme-toggle {
    background: transparent;
    border: none;
    color: var(--text-color);
    font-size: 1.2rem;
    cursor: pointer;
    transition: var(--transition);
}

.theme-toggle:hover {
    color: var(--primary-color);
    transform: rotate(180deg);
}

.main-footer {
    background: var(--background-color);
    padding: 3rem 0 1rem;
    margin-top: 3rem;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.footer-section h3 {
    color: var(--text-color);
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

.footer-section p {
    color: var(--text-color-secondary);
    line-height: 1.6;
}

.footer-section ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-section ul li {
    margin-bottom: 0.5rem;
}

.footer-section ul a {
    color: var(--text-color-secondary);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: var(--transition);
}

.footer-section ul a:hover {
    color: var(--primary-color);
}

.social-links {
    display: flex;
    gap: 1rem;
}

.social-links a {
    color: var(--text-color);
    font-size: 1.5rem;
    transition: var(--transition);
}

.social-links a:hover {
    color: var(--primary-color);
    transform: translateY(-3px);
}

.app-download {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.app-store,
.play-store {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    background: var(--background-color-secondary);
    color: var(--text-color);
    text-decoration: none;
    transition: var(--transition);
}

.app-store:hover,
.play-store:hover {
    background: var(--primary-color);
    color: white;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    margin-top: 2rem;
    border-top: 1px solid var(--border-color);
}

.footer-bottom p {
    color: var(--text-color-secondary);
    font-size: 0.9rem;
}

@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: 1rem;
    }

    .main-nav ul {
        flex-wrap: wrap;
        justify-content: center;
    }

    .header-right {
        width: 100%;
        justify-content: center;
    }

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

main {
    flex: 1;
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
    width: 100%;
}

section {
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow);
    animation: slideIn 0.5s ease-out;
}

h2 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
    font-weight: 700;
}

.language-grid, .mood-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.language-card, .mood-card {
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    padding: 1.5rem;
    border-radius: 12px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    position: relative;
    overflow: hidden;
}

.language-card:hover, .mood-card:hover {
    transform: translateY(-5px);
    background: var(--hover-color);
    box-shadow: var(--card-shadow);
}

.language-card i, .mood-card i {
    font-size: 2rem;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    transition: transform 0.3s ease;
}

.language-card:hover i, .mood-card:hover i {
    transform: scale(1.2);
    animation: pulse 2s infinite;
}

.language-card span, .mood-card span {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
}

.mood-header, .playlist-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

.playlist {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.song-item {
    display: flex;
    align-items: center;
    padding: 1rem;
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    border-radius: 8px;
    text-decoration: none;
    color: var(--text-primary);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.song-item:hover {
    transform: translateX(5px);
    background: var(--hover-color);
}

.song-number {
    width: 30px;
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 600;
}

.song-thumbnail {
    width: 50px;
    height: 50px;
    border-radius: 8px;
    margin-right: 1rem;
    object-fit: cover;
    box-shadow: var(--card-shadow);
}

.song-info {
    flex: 1;
}

.song-title {
    font-weight: 600;
    margin-bottom: 0.25rem;
    color: var(--text-primary);
}

.song-artist {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

button {
    background: var(--primary-gradient);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 12px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

button:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 8px -1px rgba(0, 0, 0, 0.2);
}

.back-button {
    background: transparent;
    color: var(--text-secondary);
    padding: 0.5rem 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    border: 1px solid var(--glass-border);
}

.back-button:hover {
    color: var(--text-primary);
    background: var(--glass-bg);
    transform: translateX(-5px);
}

.hidden {
    display: none !important;
}

.loading, .error {
    text-align: center;
    padding: 2rem;
    color: var(--text-secondary);
    animation: fadeIn 0.5s ease-out;
}

@media (max-width: 768px) {
    .language-grid, .mood-grid {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    }

    h1 {
        font-size: 2rem;
    }

    h2 {
        font-size: 1.25rem;
    }

    section {
        padding: 1rem;
    }
}

.language-card {
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    position: relative;
    min-height: 150px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--border-radius);
    overflow: hidden;
    cursor: pointer;
    transition: box-shadow 0.3s ease, transform 0s;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    transform: none;
}

.language-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    transition: background 0.3s ease;
}

.language-card:hover .language-overlay {
    background: rgba(0, 0, 0, 0.3);
}

.language-card span {
    position: relative;
    z-index: 1;
    color: white;
    font-size: 1.2rem;
    font-weight: 600;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
}

.language-card:hover {
    box-shadow: 0 8px 15px rgba(0, 0, 0, 0.3);
    transform: none;
}

.language-card.selected {
    border: 3px solid var(--primary-color);
}

.language-card.selected .language-overlay {
    background: rgba(0, 0, 0, 0.2);
}

.mood-card {
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    position: relative;
    min-height: 150px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--border-radius);
    overflow: hidden;
    cursor: pointer;
    transition: box-shadow 0.3s ease, transform 0s;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    transform: none;
    padding: 1.5rem;
}

.mood-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    transition: background 0.3s ease;
}

.mood-card:hover .mood-overlay {
    background: rgba(0, 0, 0, 0.3);
}

.mood-card span {
    position: relative;
    z-index: 1;
    color: white;
    font-size: 1.5rem;
    font-weight: 600;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
    text-align: center;
}

.mood-card:hover {
    box-shadow: 0 8px 15px rgba(0, 0, 0, 0.3);
    transform: none;
}

.mood-card.selected {
    border: 3px solid var(--primary-color);
}

.mood-card.selected .mood-overlay {
    background: rgba(0, 0, 0, 0.2);
}

.generate-button-container {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 1.5rem;
    background: linear-gradient(to top, rgba(0, 0, 0, 0.8), transparent);
    display: flex;
    justify-content: center;
    z-index: 10;
}

.generate-btn {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 1rem 2rem;
    border-radius: 25px;
    font-size: 1.2rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.generate-btn:hover {
    background: var(--primary-color-dark);
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.2);
}

.generate-btn i {
    font-size: 1.2rem;
}

.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    z-index: 1000;
    backdrop-filter: blur(5px);
}

.modal-content {
    position: relative;
    background: var(--background-color);
    max-width: 400px;
    margin: 5% auto;
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
    animation: modalSlideIn 0.3s ease-out;
}

@keyframes modalSlideIn {
    from {
        transform: translateY(-50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.close-modal {
    position: absolute;
    top: 1rem;
    right: 1rem;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-color-secondary);
    transition: var(--transition);
}

.close-modal:hover {
    color: var(--text-color);
}

.modal h2 {
    text-align: center;
    margin-bottom: 2rem;
    color: var(--text-color);
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-color);
}

.form-group input {
    width: 100%;
    padding: 0.8rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    background: var(--background-color-secondary);
    color: var(--text-color);
    transition: var(--transition);
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(29, 185, 84, 0.2);
}

.form-options {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.remember-me {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-color-secondary);
}

.forgot-password {
    color: var(--primary-color);
    text-decoration: none;
    font-size: 0.9rem;
}

.forgot-password:hover {
    text-decoration: underline;
}

.login-btn,
.register-btn {
    width: 100%;
    padding: 1rem;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.login-btn:hover,
.register-btn:hover {
    background: var(--primary-color-dark);
    transform: translateY(-2px);
}

.social-login {
    margin: 2rem 0;
    text-align: center;
}

.social-login p {
    color: var(--text-color-secondary);
    margin-bottom: 1rem;
}

.social-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

.social-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.8rem 1.5rem;
    border: none;
    border-radius: var(--border-radius);
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.social-btn.google {
    background: #DB4437;
    color: white;
}

.social-btn.facebook {
    background: #4267B2;
    color: white;
}

.social-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

.register-link,
.login-link {
    text-align: center;
    margin-top: 1.5rem;
    color: var(--text-color-secondary);
}

.register-link a,
.login-link a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
}

.register-link a:hover,
.login-link a:hover {
    text-decoration: underline;
}

.welcome-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: calc(100vh - 200px);
    padding: 2rem;
    animation: fadeIn 0.8s ease-out;
    position: relative;
    margin-top: 80px;
    width: 100%;
    background: var(--background-color);
    z-index: 1;
}

.welcome-content {
    text-align: center;
    max-width: 800px;
    padding: 2rem;
}

.welcome-title {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    background: linear-gradient(45deg, var(--accent-color), #1DB954);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    animation: titleFadeIn 1s ease-out;
}

.highlight {
    color: #1DB954;
    -webkit-text-fill-color: #1DB954;
}

.welcome-subtitle {
    font-size: 1.5rem;
    color: var(--text-secondary);
    margin-bottom: 3rem;
    animation: subtitleFadeIn 1.2s ease-out;
}

.music-notes {
    position: relative;
    height: 100px;
    margin: 2rem 0;
}

.music-notes i {
    position: absolute;
    font-size: 2rem;
    color: var(--accent-color);
    opacity: 0;
}

.note-1 {
    left: -50px;
    animation: floatNote 3s infinite 0.5s;
}

.note-2 {
    animation: floatNote 3s infinite 1s;
}

.note-3 {
    right: -50px;
    animation: floatNote 3s infinite 1.5s;
}

.welcome-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.welcome-card {
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    padding: 2rem;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    animation: cardFadeIn 0.8s ease-out forwards;
    opacity: 0;
}

.welcome-card:nth-child(1) { animation-delay: 0.2s; }
.welcome-card:nth-child(2) { animation-delay: 0.4s; }
.welcome-card:nth-child(3) { animation-delay: 0.6s; }

.welcome-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.welcome-card i {
    font-size: 2.5rem;
    color: var(--accent-color);
    margin-bottom: 1rem;
}

.welcome-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.welcome-card p {
    color: var(--text-secondary);
    line-height: 1.6;
}

@keyframes titleFadeIn {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes subtitleFadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes floatNote {
    0% {
        transform: translateY(0) rotate(0deg);
        opacity: 0;
    }
    50% {
        opacity: 1;
    }
    100% {
        transform: translateY(-100px) rotate(360deg);
        opacity: 0;
    }
}

@keyframes cardFadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.search-container {
    position: relative;
    margin: 0 1rem;
}

.search-box {
    display: flex;
    align-items: center;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 25px;
    padding: 0.5rem 1rem;
    transition: all 0.3s ease;
}

.search-box:focus-within {
    box-shadow: 0 0 0 2px var(--primary-color);
    transform: translateY(-1px);
}

#searchInput {
    background: transparent;
    border: none;
    color: var(--text-primary);
    padding: 0.5rem;
    width: 200px;
    font-size: 0.9rem;
}

#searchInput:focus {
    outline: none;
}

#searchInput::placeholder {
    color: var(--text-secondary);
}

#searchBtn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0.5rem;
    transition: color 0.3s ease;
}

#searchBtn:hover {
    color: var(--primary-color);
}

.search-results {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--background-color);
    border: 1px solid var(--glass-border);
    border-radius: 8px;
    margin-top: 0.5rem;
    max-height: 300px;
    overflow-y: auto;
    display: none;
    z-index: 100;
}

.search-results.active {
    display: block;
}

.search-result-item {
    padding: 0.8rem 1rem;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.search-result-item:hover {
    background-color: var(--glass-bg);
}

.search-result-item.language {
    color: var(--primary-color);
}

.search-result-item.mood {
    color: var(--accent-color);
}

.library-container {
    padding: 2rem;
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    margin-bottom: 2rem;
    animation: slideIn 0.5s ease-out;
}

.library-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

.trending-songs {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
}

.trending-song-card {
    background: var(--card-bg);
    border-radius: 12px;
    overflow: hidden;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    cursor: pointer;
}

.trending-song-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
}

.trending-song-thumbnail {
    width: 100%;
    height: 180px;
    object-fit: cover;
}

.trending-song-info {
    padding: 1rem;
}

.trending-song-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.trending-song-channel {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.trending-song-views {
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-top: 0.5rem;
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 700;
    color: #1DB954; /* Spotify green color */
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.logo i {
    font-size: 1.8rem;
    color: #1DB954; /* Spotify green color */
}