:root {
    --bg: #f2f5f9;
    --text: #1c2733;
    --muted: #5b6774;
    --accent: #004c94;
    --accent-dark: #003a72;
    --card-bg: #ffffff;
    --border: #d8e0ea;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
}

.site-header {
    position: relative;
    text-align: center;
    padding: 2rem 1rem 1rem;
}

.admin-btn {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: var(--accent);
    color: #fff;
    border: 2px solid var(--accent-dark);
    padding: 0.4rem 1.1rem;
    border-radius: 8px;
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 600;
}

.admin-btn:hover {
    background: var(--accent-dark);
}

.site-header h1 {
    margin: 0 0 1rem;
    font-size: 1.6rem;
    font-weight: 600;
}

.site-header p {
    color: var(--muted);
    font-size: 0.9rem;
}

.tabs {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.tab {
    padding: 0.5rem 1.1rem;
    border-radius: 999px;
    text-decoration: none;
    color: var(--text);
    background: var(--card-bg);
    border: 1px solid var(--border);
    font-size: 0.95rem;
    transition: background 0.15s, color 0.15s;
}

.tab.active, .tab:hover {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
}

main {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 1rem 3rem;
}

.upload-box {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1.5rem;
    margin: 1.5rem 0;
}

.upload-box h2 {
    margin-top: 0;
    font-size: 1.15rem;
}

.upload-box .hint {
    margin: 0.6rem 0 0;
    font-size: 0.8rem;
    color: var(--muted);
}

.upload-box form {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
    align-items: center;
}

.upload-box input[type="text"] {
    padding: 0.55rem 0.8rem;
    border-radius: 8px;
    border: 1px solid var(--border);
    font-size: 0.95rem;
}

.upload-box input[type="file"] {
    font-size: 0.9rem;
}

button, .delete-btn {
    background: var(--accent);
    color: #fff;
    border: none;
    padding: 0.6rem 1.2rem;
    border-radius: 8px;
    font-size: 0.95rem;
    cursor: pointer;
}

button:hover, .delete-btn:hover {
    background: var(--accent-dark);
}

.msg {
    padding: 0.6rem 0.9rem;
    border-radius: 8px;
    font-size: 0.9rem;
    margin: 0.3rem 0;
    width: 100%;
}

.msg-success { background: #e5f5e6; color: #2c6b2f; }
.msg-error { background: #fbe7e5; color: #a3352b; }

.empty {
    text-align: center;
    color: var(--muted);
    padding: 3rem 0;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 0.6rem;
}

.grid-item {
    position: relative;
    display: block;
    aspect-ratio: 1 / 1;
    overflow: hidden;
    border-radius: 10px;
    background: var(--card-bg);
    border: 1px solid var(--border);
}

.grid-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.uploader {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: rgba(0,0,0,0.55);
    color: #fff;
    font-size: 0.7rem;
    padding: 0.2rem 0.4rem;
    text-align: center;
}

.lightbox {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.lightbox.hidden { display: none; }

.lightbox img {
    max-width: 90vw;
    max-height: 90vh;
    border-radius: 6px;
}

.lightbox-close, .lightbox-prev, .lightbox-next {
    position: absolute;
    background: rgba(255,255,255,0.15);
    color: #fff;
    border: none;
    font-size: 1.6rem;
    cursor: pointer;
    padding: 0.4rem 0.8rem;
    border-radius: 50%;
}

.lightbox-close { top: 1.2rem; right: 1.2rem; }
.lightbox-prev { left: 1.2rem; top: 50%; transform: translateY(-50%); }
.lightbox-next { right: 1.2rem; top: 50%; transform: translateY(-50%); }

.admin-login {
    max-width: 340px;
    margin: 4rem auto;
    text-align: center;
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 2rem;
}

.admin-login form {
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
    margin-top: 1rem;
}

.admin-login input {
    padding: 0.6rem 0.8rem;
    border-radius: 8px;
    border: 1px solid var(--border);
}

.grid-item form {
    position: absolute;
    top: 0.3rem;
    right: 0.3rem;
    margin: 0;
}

.grid-item .delete-btn {
    padding: 0.2rem 0.5rem;
    font-size: 0.75rem;
    border-radius: 6px;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #10161d;
        --text: #eef2f6;
        --muted: #9aa7b4;
        --card-bg: #1a2229;
        --border: #2c3742;
    }
}

.site-logo {
    display: block;
    margin: 0 auto 0.75rem;
    width: 200px;
    height: auto;
}

.site-footer {
    text-align: center;
    padding: 2rem 1rem 3rem;
}

.site-footer a {
    color: var(--muted);
    font-size: 0.8rem;
    text-decoration: none;
}

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

/* Tablet */
@media (max-width: 900px) {
    .grid {
        grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
    }
}

/* Phone */
@media (max-width: 600px) {
    .site-header {
        padding: 1.25rem 0.75rem 0.75rem;
    }

    .site-logo {
        width: 150px;
    }

    .site-header h1 {
        font-size: 1.25rem;
    }

    .admin-btn {
        top: 0.6rem;
        right: 0.6rem;
        padding: 0.35rem 0.8rem;
        font-size: 0.75rem;
    }

    .tab {
        padding: 0.5rem 0.9rem;
        font-size: 0.9rem;
    }

    main {
        padding: 0 0.6rem 2rem;
    }

    .upload-box {
        padding: 1rem;
    }

    .upload-box form {
        flex-direction: column;
        align-items: stretch;
    }

    .upload-box button {
        width: 100%;
    }

    .grid {
        grid-template-columns: repeat(auto-fill, minmax(105px, 1fr));
        gap: 0.4rem;
    }

    .lightbox-close, .lightbox-prev, .lightbox-next {
        font-size: 1.2rem;
        padding: 0.3rem 0.6rem;
    }

    .lightbox-close { top: 0.6rem; right: 0.6rem; }
    .lightbox-prev { left: 0.4rem; }
    .lightbox-next { right: 0.4rem; }

    .admin-login {
        margin: 2rem 1rem;
        padding: 1.5rem;
    }
}

/* Very small phones */
@media (max-width: 360px) {
    .site-logo {
        width: 120px;
    }

    .site-header h1 {
        font-size: 1.1rem;
    }
}

/* Large desktop */
@media (min-width: 1400px) {
    main {
        max-width: 1300px;
    }
}