:root {
    --bg-color: #121212;
    --text-primary: #FFFFFF;
    --text-secondary: #B3B3B3;
    --accent: #1DB954;
    --accent-hover: #1ed760;
    --border-color: #333;
    --font-family: 'Outfit', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    --transition-fast: 0.2s ease;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font-family);
    background: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.5;
    min-height: 100vh;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Typography */
h1, h2, h3, h4 {
    color: var(--text-primary);
    font-weight: 700;
}

p {
    color: var(--text-secondary);
}

/* Buttons */
.btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background-color: var(--accent);
    color: #000;
    font-weight: 900;
    text-transform: uppercase;
    font-size: 1rem;
    padding: 14px 32px;
    border: 3px solid #000;
    border-radius: 0;
    cursor: pointer;
    text-decoration: none;
    box-shadow: 4px 4px 0 #fff;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.btn-primary:hover {
    background-color: var(--accent-hover);
}

.btn-primary:active {
    transform: translate(4px, 4px);
    box-shadow: 0 0 0 #fff;
}

.btn-secondary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background-color: transparent;
    color: var(--text-primary);
    font-weight: 900;
    text-transform: uppercase;
    font-size: 0.9rem;
    padding: 10px 24px;
    border: 3px solid var(--border-color);
    border-radius: 0;
    cursor: pointer;
    text-decoration: none;
    box-shadow: 4px 4px 0 var(--border-color);
    transition: all var(--transition-fast);
}

.btn-secondary:hover {
    border-color: var(--text-primary);
    box-shadow: 4px 4px 0 var(--text-primary);
}

.btn-secondary:active {
    transform: translate(4px, 4px);
    box-shadow: 0 0 0 var(--text-primary);
}

/* Landing Page */
.landing-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: 2rem;
    text-align: center;
}

.hero {
    margin-bottom: 3rem;
    animation: fadeUp 0.8s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.hero h1 {
    font-size: clamp(2.5rem, 8vw, 5rem);
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: -0.04em;
    margin-bottom: 1rem;
}

.highlight {
    color: var(--accent);
}

.subtitle {
    font-size: 1.25rem;
    max-width: 600px;
    margin: 0 auto 3rem auto;
    color: var(--text-secondary);
}

/* Features Grid */
.features {
    display: flex;
    gap: 1.5rem;
    margin-top: 4rem;
    flex-wrap: wrap;
    justify-content: center;
    opacity: 0;
    animation: fadeUp 0.8s cubic-bezier(0.16, 1, 0.3, 1) 0.2s forwards;
}

.feature-card {
    background: #111;
    border: 3px solid var(--border-color);
    border-radius: 0;
    padding: 2rem;
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--text-secondary);
    box-shadow: 6px 6px 0 var(--border-color);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.feature-card:hover {
    color: var(--text-primary);
    transform: translate(-4px, -4px);
    box-shadow: 10px 10px 0 var(--text-primary);
}

/* Header & App Container */
.app-container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 2rem;
}

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 3rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.header h2 {
    font-size: 2rem;
    letter-spacing: -0.02em;
}

/* Share Section */
.share-section {
    background: transparent;
    padding: 2.5rem;
    margin-bottom: 3rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border: 4px solid var(--accent);
    border-radius: 0;
    box-shadow: 8px 8px 0 var(--accent);
}

.share-section h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.share-input-group {
    display: flex;
    gap: 1rem;
}

.share-input-group input {
    padding: 14px 16px;
    font-family: var(--font-family);
    font-size: 1rem;
    font-weight: 900;
    border: 3px solid var(--border-color);
    border-radius: 0;
    background: #000;
    color: var(--text-primary);
    width: 350px;
    outline: none;
    transition: border-color var(--transition-fast);
}

.share-input-group input:focus {
    border-color: var(--text-primary);
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 1.5rem;
    margin-bottom: 4rem;
}

.stat-box {
    background: #111;
    border: 3px solid var(--border-color);
    border-radius: 0;
    padding: 2rem;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
    box-shadow: 6px 6px 0 var(--border-color);
    position: relative;
    overflow: hidden;
}

.stat-box:hover {
    transform: translate(-4px, -4px);
    box-shadow: 10px 10px 0 var(--text-primary);
    border-color: var(--text-primary);
}

.stat-box h3 {
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

/* Track List */
.track-list {
    list-style: none;
}

.track-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.75rem;
    border: 2px solid transparent;
    transition: all var(--transition-fast);
    margin-bottom: 0.5rem;
}

.track-item:last-child {
    margin-bottom: 0;
}

.track-item:hover {
    border-color: var(--text-primary);
    background-color: #1a1a1a;
}

.track-img {
    width: 56px;
    height: 56px;
    object-fit: cover;
    border-radius: 0;
    border: 2px solid var(--border-color);
}

.track-info {
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.track-title {
    font-weight: 600;
    font-size: 1rem;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

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

/* Top Artist Focus */
.top-artist-img {
    width: 100%;
    aspect-ratio: 1;
    object-fit: cover;
    border-radius: 0;
    border: 3px solid var(--border-color);
    margin-bottom: 1.5rem;
    transition: border-color 0.2s ease;
}

.stat-box:hover .top-artist-img {
    border-color: var(--text-primary);
}

.top-artist-name {
    font-size: 2.2rem;
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: -0.02em;
    word-break: break-word;
}

/* Single Track Display (Recent/Playing) */
.single-track-display {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.single-track-display .track-img {
    width: 160px;
    height: 160px;
    border-radius: 0;
    border: 3px solid var(--border-color);
    margin-bottom: 1.5rem;
}

.single-track-display .track-title {
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
    white-space: normal;
}

.single-track-display .track-artist {
    font-size: 1rem;
}

/* Animations */
@keyframes fadeUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Loading Overlay */
#loading {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: var(--bg-color);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid rgba(255, 255, 255, 0.1);
    border-left-color: var(--accent);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.hidden {
    display: none !important;
}

/* Modal Overlay */
.modal-overlay {
    position: fixed;
    top: 0; left: 0;
    width: 100vw; height: 100vh;
    background: rgba(0,0,0,0.8);
    backdrop-filter: blur(5px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 2000;
    animation: fadeIn 0.3s ease;
}

.modal-content {
    background: #0d0d0d;
    padding: 3rem;
    box-shadow: 12px 12px 0 var(--accent);
    max-width: 500px;
    width: 90%;
    text-align: center;
    animation: scaleIn 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    border: 4px solid var(--accent);
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes scaleIn {
    from { transform: scale(0.95); opacity: 0; }
    to { transform: scale(1); opacity: 1; }
}

.modal-content h2 {
    font-size: 2rem;
    margin-bottom: 1rem;
}

.modal-content p {
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.modal-form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.modal-form input {
    padding: 14px 16px;
    font-size: 1rem;
    font-weight: 900;
    font-family: inherit;
    border-radius: 0;
    border: 3px solid var(--border-color);
    background: #000;
    color: var(--text-primary);
    outline: none;
    transition: border-color var(--transition-fast);
}

.modal-form input:focus {
    border-color: var(--accent);
}

.ghost-btn {
    background: transparent;
    color: var(--text-secondary);
    border: none;
    padding: 8px;
    font-size: 0.9rem;
    cursor: pointer;
    text-decoration: underline;
    margin-top: 1rem;
}
.ghost-btn:hover {
    color: var(--text-primary);
}