:root {
    --bg-color: #0a0a0a;
    --text-color: #ffffff;
    --text-muted: #888888;
    --accent-color: #3b82f6;
    --border-color: #333333;
    --nav-height: 60px;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    line-height: 1.6;
    min-height: 100vh;
}

/* Header / Navigation */
header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav-height);
    background-color: var(--bg-color);
    border-bottom: 1px solid var(--border-color);
    z-index: 100;
}

nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: 1200px;
    margin: 0 auto;
    height: 100%;
    padding: 0 1rem;
}

.nav-left,
.nav-right {
    flex: 1;
}

.nav-right {
    text-align: right;
}

.nav-center {
    flex: 1;
    text-align: center;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.nav-btn.active {
    background-color: var(--border-color);
    border-color: var(--text-muted);
}

.nav-btn {
    display: inline-block;
    padding: 0.5rem 1rem;
    color: var(--text-color);
    text-decoration: none;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    transition: background-color 0.2s, border-color 0.2s;
}

.nav-btn:hover:not(.disabled) {
    background-color: var(--border-color);
    border-color: var(--text-muted);
}

.nav-btn.disabled {
    color: var(--text-muted);
    cursor: not-allowed;
    opacity: 0.5;
}

/* Date selector */
#date-select {
    background-color: var(--bg-color);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    padding: 0.5rem 1rem;
    border-radius: 4px;
    font-size: 1rem;
    cursor: pointer;
}

#date-select:hover {
    border-color: var(--text-muted);
}

#date-select:focus {
    outline: none;
    border-color: var(--accent-color);
}

/* Main content */
main {
    padding-top: calc(var(--nav-height) + 1rem);
    padding-bottom: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

/* Day view */
.day-view {
    padding: 0 1rem;
}

.composite-image {
    margin-bottom: 2rem;
}

.composite-image img {
    width: 100%;
    height: auto;
    border-radius: 8px;
}

/* Share bar */
.share-bar {
    display: flex;
    gap: 0.5rem;
    padding: 0.75rem 0;
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 1rem;
}

.share-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.5rem 0.75rem;
    appearance: none;
    -webkit-appearance: none;
    background-color: transparent;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 0.875rem;
    font-family: inherit;
    line-height: 1;
    transition: color 0.2s, border-color 0.2s, background-color 0.2s;
}

.share-btn:hover {
    color: var(--text-color);
    border-color: var(--text-muted);
    background-color: var(--border-color);
}

.share-btn.copied {
    color: #22c55e;
    border-color: #22c55e;
}

.share-btn svg {
    flex-shrink: 0;
}

/* Headlines section */
.headlines {
    margin-top: 2rem;
}

.headlines h2 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.headlines ul {
    list-style: none;
}

.headlines li {
    padding: 1rem 0;
    border-bottom: 1px solid var(--border-color);
}

.headlines li:last-child {
    border-bottom: none;
}

.headline-text {
    display: block;
    font-size: 1.1rem;
    margin-bottom: 0.25rem;
}

a.headline-text {
    color: var(--text-color);
    text-decoration: none;
}

a.headline-text:hover {
    text-decoration: underline;
    color: var(--accent-color);
}

.headline-meta {
    display: block;
    font-size: 0.875rem;
    color: var(--text-muted);
}

/* Gallery view */
.gallery-view {
    padding: 0 1rem;
}

.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1rem;
}

.gallery-card {
    position: relative;
    display: block;
    border-radius: 8px;
    overflow: hidden;
    text-decoration: none;
    border: 1px solid var(--border-color);
    transition: border-color 0.2s, transform 0.2s;
}

.gallery-card:hover {
    border-color: var(--text-muted);
    transform: translateY(-2px);
}

.gallery-card img {
    width: 100%;
    height: auto;
    display: block;
}

.gallery-card-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 0.75rem;
    background: linear-gradient(transparent, rgba(0, 0, 0, 0.8));
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
}

.gallery-badge {
    background-color: var(--accent-color);
    color: var(--text-color);
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: lowercase;
}

.gallery-date {
    color: var(--text-muted);
    font-size: 0.8rem;
}

.gallery-empty {
    text-align: center;
    color: var(--text-muted);
    padding: 4rem 1rem;
    font-size: 1.1rem;
}

/* Loading state */
#loading {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 1.25rem;
    color: var(--text-muted);
}

/* Responsive */
@media (max-width: 640px) {
    nav {
        padding: 0 0.5rem;
    }

    .nav-btn {
        padding: 0.4rem 0.75rem;
        font-size: 0.875rem;
    }

    #date-select {
        padding: 0.4rem 0.5rem;
        font-size: 0.875rem;
    }

    .day-view {
        padding: 0 0.5rem;
    }

    .headline-text {
        font-size: 1rem;
    }

    .share-label {
        display: none;
    }

    .share-btn {
        padding: 0.5rem;
    }

    .gallery-grid {
        grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
        gap: 0.5rem;
    }

    .gallery-view {
        padding: 0 0.5rem;
    }
}