@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

:root {
    --bg-color: #fafafa;
    --surface-color: #ffffff;
    --text-primary: #171717;
    --text-secondary: #737373;
    --accent-color: #000000;
    --accent-contrast: #ffffff;
    --border-color: #e5e5e5;
    --input-bg: #f5f5f5;
    --nav-bg: rgba(255, 255, 255, 0.8);
    --transition-speed: 0.2s;
}

[data-theme="dark"] {
    --bg-color: #0a0a0a;
    --surface-color: #1a1a1a;
    --text-primary: #f5f5f5;
    --text-secondary: #a3a3a3;
    --accent-color: #ffffff;
    --accent-contrast: #000000;
    --border-color: #262626;
    --input-bg: #1f1f1f;
    --nav-bg: rgba(10, 10, 10, 0.8);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    -webkit-tap-highlight-color: transparent;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.5;
    transition: background-color var(--transition-speed), color var(--transition-speed);
}

.app-container {
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem 1rem;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

main {
    flex: 1;
}

/* Header */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 3rem;
}

.logo {
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.github-link,
.theme-toggle,
.header-btn {
    text-decoration: none;
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-primary);
    padding: 0.5rem;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background var(--transition-speed);
}

.github-link:hover,
.theme-toggle:hover,
.header-btn:hover {
    background: var(--input-bg);
}

/* Search Section */
.search-wrapper {
    position: relative;
    margin-bottom: 2rem;
}

.search-bar {
    display: flex;
    align-items: center;
    background: var(--input-bg);
    border-radius: 12px;
    padding: 0.75rem 1rem;
    border: 1px solid transparent;
    transition: border-color var(--transition-speed), background var(--transition-speed);
}

.search-bar:focus-within {
    border-color: var(--text-secondary);
    background: var(--surface-color);
}

.search-bar input {
    flex: 1;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1rem;
    margin-left: 0.75rem;
    outline: none;
    font-family: inherit;
}

.search-bar i {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* Autocomplete Results */
.results-dropdown {
    position: absolute;
    top: calc(100% + 8px);
    left: 0;
    right: 0;
    background: var(--surface-color);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    z-index: 50;
    overflow: hidden;
    display: none;
}

.result-item {
    display: flex;
    align-items: center;
    padding: 0.75rem 1rem;
    gap: 1rem;
    cursor: pointer;
    transition: background var(--transition-speed);
}

.result-item:hover {
    background: var(--input-bg);
}

.result-item img {
    width: 44px;
    height: 44px;
    border-radius: 6px;
    object-fit: cover;
}

.result-text {
    overflow: hidden;
}

.result-title {
    font-weight: 500;
    font-size: 0.95rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.result-subtitle {
    font-size: 0.85rem;
    color: var(--text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* Lyrics Container */
.lyrics-view {
    display: none;
    animation: slideUp 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

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

.track-info {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.track-info img {
    width: 80px;
    height: 80px;
    border-radius: 12px;
    object-fit: cover;
}

.track-details h2 {
    font-size: 1.5rem;
    font-weight: 700;
}

.track-details p {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* Tabs & Copy */
.controls-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 1.5rem;
    position: sticky;
    top: 0;
    background: var(--nav-bg);
    backdrop-filter: blur(8px);
    z-index: 10;
}

.tabs {
    display: flex;
    gap: 1.5rem;
}

.tab {
    padding: 0.75rem 0;
    background: none;
    border: none;
    color: var(--text-secondary);
    font-family: inherit;
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    position: relative;
}

.tab.active {
    color: var(--text-primary);
}

.tab.active::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--text-primary);
}

.copy-button {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.85rem;
    font-weight: 500;
    padding: 0.5rem;
    border-radius: 6px;
    transition: background var(--transition-speed), color var(--transition-speed);
}

.copy-button:hover {
    background: var(--input-bg);
    color: var(--text-primary);
}

.lyrics-content {
    white-space: pre-wrap;
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--text-primary);
    padding-bottom: 5rem;
}

.karaoke-timestamp {
    color: var(--text-secondary);
    font-size: 0.85rem;
    font-family: monospace;
    opacity: 0.5;
}

/* Welcome State */
.welcome-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 5rem 2rem;
    text-align: center;
    animation: fadeIn 0.5s ease-out;
}

.welcome-state i {
    font-size: 4rem;
    margin-bottom: 2rem;
    color: var(--text-secondary);
    opacity: 0.3;
}

.welcome-state h2 {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.welcome-state p {
    color: var(--text-secondary);
    font-size: 1.1rem;
    max-width: 400px;
    line-height: 1.6;
}

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

/* Empty State */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 4rem 2rem;
    text-align: center;
    color: var(--text-secondary);
}

.empty-state i {
    font-size: 3rem;
    margin-bottom: 1.5rem;
    color: var(--text-secondary);
    opacity: 0.5;
    animation: floating 3s ease-in-out infinite;
}

.empty-state h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.empty-state p {
    font-size: 0.95rem;
    max-width: 300px;
}

@keyframes floating {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

/* Loading State */
.loader {
    display: none;
    text-align: center;
    padding: 3rem;
}

.spinner {
    width: 24px;
    height: 24px;
    border: 2px solid var(--border-color);
    border-top-color: var(--text-primary);
    border-radius: 50%;
    display: inline-block;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Mobile Adjustments */
@media (max-width: 600px) {
    .app-container {
        padding: 1rem;
    }
    
    header {
        margin-bottom: 2rem;
    }
    
    .track-info {
        gap: 1rem;
    }
    
    .track-info img {
        width: 64px;
        height: 64px;
    }
    
    .track-details h2 {
        font-size: 1.25rem;
    }
    
    .track-details p {
        font-size: 0.95rem;
    }
    
    .tabs {
        gap: 1rem;
    }
    
    .tab {
        font-size: 0.85rem;
    }
    
    .lyrics-content {
        font-size: 1rem;
    }
}

footer {
    margin-top: 4rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

footer a {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
}

footer a:hover {
    text-decoration: underline;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    backdrop-filter: blur(4px);
    align-items: center;
    justify-content: center;
    padding: 1rem;
}

.modal.active {
    display: flex;
}

.modal-content {
    background-color: var(--surface-color);
    border-radius: 16px;
    width: 100%;
    max-width: 600px;
    max-height: 90vh;
    overflow-y: auto;
    position: relative;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    animation: modalSlideIn 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes modalSlideIn {
    from { opacity: 0; transform: translateY(20px) scale(0.95); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

.modal-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    background: var(--surface-color);
    z-index: 1;
}

.modal-header h2 {
    font-size: 1.25rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.close-btn {
    background: none;
    border: none;
    font-size: 2rem;
    color: var(--text-secondary);
    cursor: pointer;
    line-height: 1;
}

.modal-body {
    padding: 1.5rem;
}

.api-section {
    margin-top: 2rem;
}

.api-section h3 {
    font-size: 1rem;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.api-code {
    display: block;
    background: var(--input-bg);
    padding: 0.75rem 1rem;
    border-radius: 8px;
    font-family: monospace;
    font-size: 0.9rem;
    color: var(--text-primary);
    word-break: break-all;
}

.api-params {
    list-style: none;
}

.api-params li {
    margin-bottom: 0.5rem;
    font-size: 0.95rem;
}

.api-params code {
    background: var(--input-bg);
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
}

.api-json {
    background: var(--input-bg);
    padding: 1rem;
    border-radius: 8px;
    font-family: monospace;
    font-size: 0.85rem;
    color: var(--text-primary);
    overflow-x: auto;
}