/* ─── Reset & Variables ─────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
    --bg:        #0d0d0d;
    --surface:   #161616;
    --border:    #252525;
    --text:      #efefef;
    --muted:     #777;
    --accent:    #ffffff;
    --radius:    4px;
    --header-h:  58px;
    --max-w:     1440px;
}

html { font-size: 16px; scroll-behavior: smooth; }

body {
    background: var(--bg);
    color: var(--text);
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ─── Header ────────────────────────────────────────────────── */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    height: var(--header-h);
    background: rgba(13, 13, 13, 0.88);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--border);
}

.header-inner {
    max-width: var(--max-w);
    margin: 0 auto;
    padding: 0 2rem;
    height: 100%;
    display: flex;
    align-items: center;
}

.header-gallery {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: center;
}

.site-logo {
    font-size: 0.875rem;
    font-weight: 700;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--accent);
    user-select: none;
}

.header-gallery .site-logo { text-align: center; }

.year-label {
    font-size: 0.8125rem;
    color: var(--muted);
    letter-spacing: 0.05em;
    text-align: right;
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--muted);
    text-decoration: none;
    font-size: 0.8125rem;
    transition: color 0.2s;
}
.back-link svg { width: 15px; height: 15px; flex-shrink: 0; }
.back-link:hover { color: var(--accent); }

/* ─── Main content ──────────────────────────────────────────── */
.main-content {
    max-width: var(--max-w);
    margin: 0 auto;
    padding: 3rem 2rem 5rem;
}

.empty-state {
    color: var(--muted);
    font-size: 0.9375rem;
    padding: 4rem 0;
    text-align: center;
}
.empty-state code {
    font-family: monospace;
    background: var(--surface);
    padding: 2px 6px;
    border-radius: var(--radius);
}

/* ─── Years Grid (index) ────────────────────────────────────── */
.years-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.25rem;
}

.year-card {
    position: relative;
    aspect-ratio: 2 / 3;
    border-radius: 6px;
    overflow: hidden;
    cursor: pointer;
    background: var(--surface);
    border: 1px solid var(--border);
    transition: transform 0.35s cubic-bezier(.25,.46,.45,.94),
                box-shadow 0.35s ease;
    -webkit-user-select: none;
    user-select: none;
}

.year-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 24px 64px rgba(0, 0, 0, 0.6);
}

.card-bg {
    position: absolute;
    inset: 0;
    background-size: cover;
    background-position: center;
    transition: transform 0.6s cubic-bezier(.25,.46,.45,.94);
}
.year-card:hover .card-bg { transform: scale(1.05); }

.card-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(
        to top,
        rgba(0, 0, 0, 0.88) 0%,
        rgba(0, 0, 0, 0.3)  50%,
        rgba(0, 0, 0, 0.08) 100%
    );
}

.card-content {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.year-number {
    font-size: 3rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    line-height: 1;
    color: #fff;
}

.photo-count {
    font-size: 0.8125rem;
    color: rgba(255, 255, 255, 0.5);
    letter-spacing: 0.04em;
}

.lock-badge {
    position: absolute;
    top: 1.125rem;
    right: 1.125rem;
    width: 34px;
    height: 34px;
    background: rgba(0, 0, 0, 0.55);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(4px);
}
.lock-badge svg {
    width: 14px;
    height: 14px;
    color: rgba(255, 255, 255, 0.75);
}

/* ─── Gallery meta ──────────────────────────────────────────── */
.gallery-meta {
    color: var(--muted);
    font-size: 0.8125rem;
    letter-spacing: 0.04em;
    margin-bottom: 1.25rem;
}

/* ─── Photo Grid ────────────────────────────────────────────── */
.photo-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 3px;
}

.photo-item {
    aspect-ratio: 1;
    overflow: hidden;
    cursor: pointer;
    background: var(--surface);
    border: none;
    padding: 0;
    display: block;
}

.photo-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    opacity: 0.88;
    transition: transform 0.45s cubic-bezier(.25,.46,.45,.94), opacity 0.2s;
    will-change: transform;
}
.photo-item:hover img {
    transform: scale(1.06);
    opacity: 1;
}

/* ─── Modal ─────────────────────────────────────────────────── */
.modal-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.75);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    z-index: 500;
    align-items: center;
    justify-content: center;
    padding: 1rem;
}
.modal-overlay.is-open { display: flex; }

.modal-box {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 2rem;
    width: 100%;
    max-width: 360px;
    position: relative;
    animation: modal-in 0.22s cubic-bezier(.34,1.56,.64,1);
}

@keyframes modal-in {
    from { opacity: 0; transform: scale(0.94) translateY(8px); }
    to   { opacity: 1; transform: scale(1)    translateY(0);   }
}

.modal-close {
    position: absolute;
    top: 0.875rem;
    right: 0.875rem;
    background: none;
    border: none;
    color: var(--muted);
    font-size: 1.125rem;
    cursor: pointer;
    line-height: 1;
    padding: 4px;
    transition: color 0.15s;
}
.modal-close:hover { color: var(--accent); }

.modal-title {
    font-size: 1.1875rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
    color: var(--accent);
}

.modal-subtitle {
    font-size: 0.8125rem;
    color: var(--muted);
    margin-bottom: 1.5rem;
}

.input-group { margin-bottom: 0.875rem; }

.input-group input[type="text"] {
    width: 100%;
    background: var(--bg);
    border: 1px solid var(--border);
    color: var(--text);
    padding: 0.6875rem 0.875rem;
    border-radius: var(--radius);
    font-size: 0.9375rem;
    font-family: 'SF Mono', 'Fira Mono', monospace;
    letter-spacing: 0.08em;
    outline: none;
    transition: border-color 0.15s;
    -webkit-appearance: none;
}
.input-group input[type="text"]:focus {
    border-color: rgba(255, 255, 255, 0.35);
}

.input-error {
    display: block;
    margin-top: 0.4rem;
    font-size: 0.75rem;
    color: #f05050;
}
.input-error[hidden] { display: none; }

.btn-primary {
    display: block;
    width: 100%;
    padding: 0.6875rem;
    background: var(--accent);
    color: #000;
    border: none;
    border-radius: var(--radius);
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    letter-spacing: 0.04em;
    transition: opacity 0.15s;
}
.btn-primary:hover { opacity: 0.85; }

/* ─── Lightbox ──────────────────────────────────────────────── */
.lightbox {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.97);
    z-index: 1000;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}
.lightbox.is-open { display: flex; }

.lb-stage {
    display: flex;
    align-items: center;
    justify-content: center;
    flex: 1;
    width: 100%;
    padding: 3.5rem 5rem;
    cursor: zoom-out;
}

#lb-img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    display: block;
    cursor: default;
    border-radius: 2px;
}

.lb-counter {
    position: fixed;
    bottom: 1.25rem;
    left: 50%;
    transform: translateX(-50%);
    color: rgba(255, 255, 255, 0.35);
    font-size: 0.75rem;
    letter-spacing: 0.1em;
    pointer-events: none;
}

.lb-close {
    position: fixed;
    top: 1.25rem;
    right: 1.25rem;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--accent);
    font-size: 1.25rem;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.15s;
    z-index: 10;
}
.lb-close:hover { background: rgba(255, 255, 255, 0.16); }

.lb-download {
    position: fixed;
    top: 1.25rem;
    left: 1.25rem;
    display: flex;
    align-items: center;
    gap: 0.375rem;
    height: 40px;
    padding: 0 1rem;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    color: var(--accent);
    font-size: 0.8125rem;
    text-decoration: none;
    transition: background 0.15s;
    z-index: 10;
}
.lb-download svg { width: 14px; height: 14px; flex-shrink: 0; }
.lb-download:hover { background: rgba(255, 255, 255, 0.15); }

/* ─── Lightbox spinner ──────────────────────────────────────────── */
.lb-spinner {
    display: none;
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 30px;
    height: 30px;
    border: 2px solid rgba(255, 255, 255, 0.1);
    border-top-color: rgba(255, 255, 255, 0.65);
    border-radius: 50%;
    animation: lb-spin 0.65s linear infinite;
    z-index: 5;
    pointer-events: none;
}

@keyframes lb-spin {
    to { transform: translate(-50%, -50%) rotate(360deg); }
}

.lightbox.is-loading .lb-spinner { display: block; }
.lightbox.is-loading #lb-img     { opacity: 0; }
#lb-img { transition: opacity 0.2s ease; }

.lb-prev, .lb-next {
    position: fixed;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--accent);
    font-size: 2rem;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.15s;
    z-index: 10;
    line-height: 1;
}
.lb-prev { left: 1.25rem; }
.lb-next { right: 1.25rem; }
.lb-prev:hover, .lb-next:hover { background: rgba(255, 255, 255, 0.14); }

/* ─── Responsive ────────────────────────────────────────────── */
@media (max-width: 1200px) {
    .photo-grid { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 860px) {
    .years-grid { grid-template-columns: repeat(2, 1fr); }
    .photo-grid { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 600px) {
    .main-content { padding: 1.5rem 1rem 4rem; }
    .header-inner { padding: 0 1rem; }
    .years-grid { grid-template-columns: 1fr 1fr; gap: 0.75rem; }
    .year-number { font-size: 2.25rem; }
    .photo-grid { grid-template-columns: repeat(2, 1fr); gap: 2px; }
    .lb-stage { padding: 3rem 1rem; }
    .lb-prev { left: 0.5rem; }
    .lb-next { right: 0.5rem; }
    .header-gallery { grid-template-columns: auto 1fr auto; gap: 0.75rem; }
    .header-gallery .site-logo { font-size: 0.75rem; }
}