/* --- 1. Design Tokens --- */
:root {
    --bg-color: #ffffff;
    --text-color: #111111;
    --text-secondary: #666666;
    --border-color: #e5e5e5;
    --accent-color: #333333;
    
    --font-main: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    
    --space-sm: 1rem;
    --space-md: 2rem;
    --space-lg: 4rem;
    
    --grid-gap: 20px;
    --card-ratio: 4/3;
    
    --anim-speed: 0.4s;
    --anim-ease: cubic-bezier(0.2, 0.8, 0.2, 1);
}

[data-theme="dark"] {
    --bg-color: #111111;
    --text-color: #ffffff;
    --text-secondary: #aaaaaa;
    --border-color: #333333;
    --accent-color: #ffffff;
}

/* --- 2. Base Reset --- */
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
    background: var(--bg-color);
    color: var(--text-color);
    font-family: var(--font-main);
    transition: background var(--anim-speed), color var(--anim-speed);
}
button { cursor: pointer; font-family: inherit; }

/* --- 3. Hero --- */
.hero {
    min-height: 80vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: var(--space-md);
    position: relative;
}
.hero__title { font-size: clamp(2rem, 8vw, 5rem); letter-spacing: -0.05em; margin-bottom: 1rem;}
.hero__tagline { color: var(--text-secondary); font-size: 1.1rem; }
.hero__date { margin-top: 1rem; font-size: 0.9rem; color: var(--text-secondary); }

/* --- 4. Controls (Filter & Search) --- */
.controls {
    padding: var(--space-md);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}
.filters { display: flex; flex-wrap: wrap; gap: 0.5rem; justify-content: center; }
.filter-btn {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 0.5rem 1rem;
    border-radius: 4px;
    transition: all 0.2s;
}
.filter-btn:hover, .filter-btn.active {
    background: var(--text-color);
    color: var(--bg-color);
    border-color: var(--text-color);
}
.search-wrapper { position: relative; width: 100%; max-width: 400px; }
#search-input {
    width: 100%;
    padding: 0.8rem;
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    border-radius: 4px;
}

/* --- 5. Gallery Grid --- */
.works-gallery {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--grid-gap);
    padding: var(--space-md);
    max-width: 1600px;
    margin: 0 auto;
}
/* Responsive Columns Strategy */
@media (min-width: 1400px) { .works-gallery { grid-template-columns: repeat(4, 1fr); } }

.work-card {
    position: relative;
    aspect-ratio: var(--card-ratio);
    overflow: hidden;
    background: var(--border-color);
    cursor: pointer;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}
.work-card.visible { opacity: 1; transform: translateY(0); }

.work-card img {
    width: 100%; height: 100%; object-fit: cover;
    transition: transform 0.5s var(--anim-ease);
}
.work-card:hover img { transform: scale(1.05); }

.work-meta {
    position: absolute; bottom: 0; left: 0; right: 0;
    padding: 1rem;
    background: linear-gradient(to top, rgba(0,0,0,0.8), transparent);
    color: white;
    transform: translateY(100%);
    transition: transform 0.3s var(--anim-ease);
    display: flex; justify-content: space-between;
}
.work-card:hover .work-meta { transform: translateY(0); }

/* --- 6. Modal --- */
.modal {
    border: none; padding: 0;
    background: rgba(0,0,0,0.5);
    width: 100vw; height: 100vh; max-width: 100vw; max-height: 100vh;
}
.modal[open] { display: flex; align-items: center; justify-content: center; }
.modal-content {
    background: var(--bg-color);
    color: var(--text-color);
    width: 90%; max-width: 1100px; height: 85vh;
    padding: 2rem;
    position: relative;
    overflow-y: auto;
    border-radius: 8px;
}
.modal-layout { display: grid; grid-template-columns: 1.5fr 1fr; gap: 2rem; }
@media (max-width: 768px) { .modal-layout { grid-template-columns: 1fr; } }

#modal-img { width: 100%; height: auto; object-fit: contain; }
#close-modal {
    position: absolute; top: 1rem; right: 1rem;
    background: none; border: none; font-size: 2rem; color: var(--text-color);
}
.modal-meta { display: flex; gap: 1rem; color: var(--text-secondary); margin-bottom: 1rem; font-size: 0.9rem; text-transform: uppercase; letter-spacing: 0.1em; }
.modal-tags span {
    display: inline-block; background: var(--border-color); color: var(--text-color);
    padding: 0.2rem 0.5rem; margin-right: 0.5rem; margin-top: 1rem; font-size: 0.8rem;
}

/* --- 7. Utilities --- */
.loading-state { text-align: center; padding: 2rem; }
.spinner {
    width: 30px; height: 30px; border: 3px solid var(--border-color);
    border-top-color: var(--text-color); border-radius: 50%;
    animation: spin 1s linear infinite; margin: 0 auto;
}
@keyframes spin { to { transform: rotate(360deg); } }
.theme-toggle { position: absolute; top: 1rem; right: 1rem; background: none; border: none; color: var(--text-color); }
[data-theme="light"] .icon-sun { display: none; }
[data-theme="dark"] .icon-moon { display: none; }
footer { text-align: center; padding: 4rem; color: var(--text-secondary); font-size: 0.9rem; }