:root {
    /* Spotify-inspired color palette */
    --bg-primary: #121212;
    --bg-secondary: #181818;
    --bg-elevated: #282828;
    --text-primary: #ffffff;
    --text-secondary: #b3b3b3;
    --accent: #1DB954;
    --accent-hover: #1ed760;
    --error: #ff4b4b;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen,
        Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.5;
}

/* Header & Navigation */
header {
    background-color: var(--bg-secondary);
    padding: 1rem;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

nav {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 700;
}

/* Venue Grid */
.venue-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
    padding: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

/* Venue Cards */
.venue-card {
    background-color: var(--bg-secondary);
    border-radius: 8px;
    padding: 1.5rem;
    transition: transform 0.2s ease;
}

.venue-card:hover {
    transform: translateY(-4px);
}

.venue-name {
    font-size: 1.25rem;
    margin-bottom: 1rem;
}

/* Month Sections */
.month-section {
    margin: 1rem 0;
    border-radius: 4px;
}

.month-section h3 {
    background-color: var(--bg-elevated);
    padding: 0.75rem 1rem;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    user-select: none;
    border-radius: 4px;
}

.month-section h3:hover {
    background-color: var(--accent);
    color: var(--bg-primary);
}

.month-section .arrow {
    transition: transform 0.2s ease;
    display: inline-block;
    width: 20px;
    text-align: center;
}

/* Playlist Container */
.playlist-container {
    margin-top: 0.5rem;
    transition: max-height 0.3s ease-out;
    max-height: 400px;
    overflow: hidden;
}

.playlist-container.collapsed {
    max-height: 0;
    margin: 0;
}

.playlist-container:not(.collapsed) {
    margin-top: 0.5rem;
}

.playlist-container iframe {
    border-radius: 8px;
    width: 100%;
}

/* Buttons */
.filter-btn {
    background-color: var(--accent);
    color: var(--bg-primary);
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    cursor: pointer;
    font-weight: 600;
    transition: background-color 0.2s ease;
}

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

/* Footer */
footer {
    text-align: center;
    padding: 2rem;
    background-color: var(--bg-secondary);
    color: var(--text-secondary);
    margin-top: 4rem;
}

/* Mobile Responsiveness */
@media (max-width: 768px) {
    .venue-grid {
        grid-template-columns: 1fr;
        padding: 1rem;
    }

    nav {
        flex-direction: column;
        gap: 1rem;
    }
}

.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--bg-primary);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.loading-overlay p {
    margin-top: 1rem;
    color: var(--text-secondary);
}

.loading-overlay.hidden {
    display: none;
}

.lds-ring {
    display: inline-block;
    position: relative;
    width: 80px;
    height: 80px;
}

.lds-ring div {
    box-sizing: border-box;
    display: block;
    position: absolute;
    width: 64px;
    height: 64px;
    margin: 8px;
    border: 8px solid var(--bg-elevated);
    border-radius: 50%;
    animation: lds-ring 1.2s cubic-bezier(0.5, 0, 0.5, 1) infinite;
    border-color: var(--accent) transparent transparent transparent;
}

.lds-ring div:nth-child(1) { animation-delay: -0.45s; }
.lds-ring div:nth-child(2) { animation-delay: -0.3s; }
.lds-ring div:nth-child(3) { animation-delay: -0.15s; }

@keyframes lds-ring {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}