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

:root {
    --c-bg:       #f4f6f8;
    --c-surface:  #ffffff;
    --c-border:   #e2e6ea;
    --c-primary:  #2563eb;
    --c-primary-h:#1d4ed8;
    --c-danger:   #dc2626;
    --c-danger-h: #b91c1c;
    --c-success:  #16a34a;
    --c-text:     #1e293b;
    --c-muted:    #64748b;
    --c-header:   #1e293b;
    --radius:     8px;
    --shadow:     0 1px 3px rgba(0,0,0,.12), 0 1px 2px rgba(0,0,0,.08);
}

body {
    font-family: system-ui, -apple-system, sans-serif;
    background: var(--c-bg);
    color: var(--c-text);
    min-height: 100vh;
    line-height: 1.5;
}

a { color: var(--c-primary); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ---- Header ---- */
.site-header {
    background: var(--c-header);
    color: #fff;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 6px rgba(0,0,0,.25);
}
.header-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.25rem;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}
.site-title {
    color: #fff;
    font-weight: 600;
    font-size: 1.1rem;
    display: flex;
    align-items: center;
    gap: .5rem;
    text-decoration: none;
}
.site-title:hover { text-decoration: none; opacity: .9; }
.header-logo { height: 60px; width: auto; object-fit: contain; }
.header-nav {
    display: flex;
    align-items: center;
    gap: .75rem;
    flex-wrap: wrap;
}
.nav-user { font-size: .875rem; color: #cbd5e1; }

/* ---- Buttons ---- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: .35rem;
    padding: .45rem .95rem;
    border-radius: var(--radius);
    font-size: .875rem;
    font-weight: 500;
    cursor: pointer;
    border: none;
    transition: background .15s, opacity .15s;
    text-decoration: none !important;
}
.btn-primary   { background: var(--c-primary); color: #fff; }
.btn-primary:hover { background: var(--c-primary-h); }
.btn-outline   { background: transparent; color: #fff; border: 1px solid rgba(255,255,255,.4); }
.btn-outline:hover { background: rgba(255,255,255,.1); }
.btn-sm        { padding: .3rem .7rem; font-size: .8rem; }
.btn-danger    { background: var(--c-danger); color: #fff; }
.btn-danger:hover { background: var(--c-danger-h); }
.btn-full      { width: 100%; justify-content: center; }

/* ---- Main content ---- */
.main-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1.5rem 1.25rem 3rem;
}

/* ---- Alerts ---- */
.alert {
    padding: .75rem 1rem;
    border-radius: var(--radius);
    margin-bottom: 1.25rem;
    font-size: .9rem;
}
.alert-error   { background: #fef2f2; border: 1px solid #fca5a5; color: #b91c1c; }
.alert-success { background: #f0fdf4; border: 1px solid #86efac; color: var(--c-success); }

/* ---- Login ---- */
.login-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: linear-gradient(135deg, #1e293b 0%, #334155 100%);
}
.login-card {
    background: #fff;
    border-radius: 12px;
    padding: 2.5rem 2rem;
    width: 100%;
    max-width: 380px;
    box-shadow: 0 20px 60px rgba(0,0,0,.3);
}
.login-logo {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: .75rem;
    margin-bottom: 2rem;
    color: var(--c-primary);
}
.login-logo h1 { font-size: 1.5rem; color: var(--c-text); }
.login-logo-img { width: 125px; height: auto; }

/* ---- Forms ---- */
.form-group { margin-bottom: 1.25rem; }
.form-group label {
    display: block;
    font-size: .875rem;
    font-weight: 500;
    margin-bottom: .4rem;
    color: var(--c-text);
}
.form-group input,
.form-group textarea {
    width: 100%;
    padding: .6rem .85rem;
    border: 1px solid var(--c-border);
    border-radius: var(--radius);
    font-size: .95rem;
    transition: border-color .15s, box-shadow .15s;
}
.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--c-primary);
    box-shadow: 0 0 0 3px rgba(37,99,235,.15);
}
.required { color: var(--c-danger); }

.login-card .btn-primary {
    padding: .65rem 1rem;
    font-size: 1rem;
    margin-top: .25rem;
}
.btn-outline-dark {
    background: transparent;
    color: var(--c-muted);
    border: 1px solid var(--c-border);
    padding: .65rem 1rem;
    font-size: .9rem;
    justify-content: center;
}
.btn-outline-dark:hover { background: var(--c-bg); color: var(--c-text); }
.admin-link { margin-top: .85rem; }

/* ---- Page header ---- */
.page-header {
    display: flex;
    align-items: baseline;
    gap: 1rem;
    flex-wrap: wrap;
    margin-bottom: 1.5rem;
}
.page-header h2 { font-size: 1.5rem; }
.page-header .btn { margin-left: auto; }
.album-desc { color: var(--c-muted); font-size: .9rem; margin-top: .25rem; }
.photo-count { color: var(--c-muted); font-size: .875rem; margin-top: .2rem; }

/* ---- Breadcrumb ---- */
.breadcrumb {
    display: flex;
    align-items: center;
    gap: .5rem;
    font-size: .875rem;
    color: var(--c-muted);
    margin-bottom: 1.25rem;
}
.breadcrumb a { color: var(--c-primary); }
.breadcrumb span { color: var(--c-muted); }

/* ---- Album grid ---- */
.album-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 1.25rem;
}
.album-card {
    background: var(--c-surface);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: transform .18s, box-shadow .18s;
    text-decoration: none !important;
    color: var(--c-text);
}
.album-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(0,0,0,.15);
}
.album-cover {
    width: 100%;
    aspect-ratio: 4/3;
    overflow: hidden;
    background: var(--c-bg);
    position: relative;
}
.album-badge {
    position: absolute;
    bottom: .5rem;
    right: .5rem;
    background: rgba(0,0,0,.55);
    color: #fff;
    font-size: .75rem;
    font-weight: 600;
    padding: .2rem .55rem;
    border-radius: 999px;
    line-height: 1.4;
    pointer-events: none;
}
.album-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform .3s;
}
.album-card:hover .album-cover img { transform: scale(1.05); }
.album-cover-empty {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #94a3b8;
}
.album-info { padding: .85rem 1rem; }
.album-info h3 { font-size: 1rem; font-weight: 600; }
.album-desc-small { font-size: .8rem; color: var(--c-muted); margin-top: .25rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.album-count { font-size: .8rem; color: var(--c-muted); display: block; margin-top: .4rem; }

/* ---- Photo grid ---- */
.photo-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 1rem;
}
.photo-card {
    display: block;
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: transform .18s, box-shadow .18s;
}
.photo-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 18px rgba(0,0,0,.18);
}
.photo-thumb {
    aspect-ratio: 4/3;
    overflow: hidden;
    background: #e2e8f0;
}
.photo-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform .3s;
}
.photo-card:hover .photo-thumb img { transform: scale(1.07); }

/* ---- Lightbox ---- */
.lightbox-view { max-width: 1100px; margin: 0 auto; }
.lightbox-nav-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1rem;
}
.lightbox-nav-bar .btn-outline {
    color: var(--c-text);
    border-color: var(--c-border);
    background: var(--c-surface);
}
.lightbox-nav-bar .btn-outline:hover { background: var(--c-bg); }
.lightbox-counter-group { display: flex; align-items: center; gap: .75rem; }
.lightbox-counter { font-size: .875rem; color: var(--c-muted); }
.btn-download { background: var(--c-primary); color: #fff; padding: .3rem .45rem; }
.btn-download:hover { background: var(--c-primary-h); }
.lightbox-frame {
    position: relative;
    background: rgba(0,0,0,.55);
    border-radius: var(--radius);
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 300px;
}
.lightbox-img {
    max-width: 100%;
    max-height: 80vh;
    display: block;
    object-fit: contain;
}
.lightbox-arrow {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(0,0,0,.5);
    color: #fff;
    font-size: 2.5rem;
    line-height: 1;
    padding: .5rem .75rem;
    text-decoration: none !important;
    border-radius: 4px;
    transition: background .15s;
    user-select: none;
}
.lightbox-arrow:hover { background: rgba(0,0,0,.8); }
.arrow-prev { left: .75rem; }
.arrow-next { right: .75rem; }
.lightbox-meta {
    display: flex;
    justify-content: space-between;
    font-size: .8rem;
    color: var(--c-muted);
    margin-top: .6rem;
    flex-wrap: wrap;
    gap: .5rem;
}

/* ---- Empty state ---- */
.empty-state {
    text-align: center;
    padding: 4rem 1rem;
    color: var(--c-muted);
}
.empty-state p { margin-bottom: 1.25rem; font-size: 1rem; }

/* ---- Admin card ---- */
.admin-card {
    background: var(--c-surface);
    border-radius: var(--radius);
    padding: 1.75rem 1.5rem;
    box-shadow: var(--shadow);
    margin-bottom: 1.5rem;
}
.admin-card h2, .admin-card h3 {
    margin-bottom: 1.25rem;
    font-size: 1.2rem;
}
.form-actions {
    display: flex;
    gap: .75rem;
    flex-wrap: wrap;
    margin-top: 1.5rem;
}

/* ---- Upload zone ---- */
.upload-zone {
    border: 2px dashed var(--c-border);
    border-radius: var(--radius);
    padding: 3rem 1.5rem;
    text-align: center;
    cursor: pointer;
    transition: border-color .2s, background .2s;
    color: var(--c-muted);
}
.upload-zone:hover, .upload-zone.drag-over {
    border-color: var(--c-primary);
    background: #eff6ff;
}
.upload-zone svg { display: block; margin: 0 auto .75rem; color: #94a3b8; }
.upload-zone p { font-size: .95rem; }
.upload-zone .upload-hint { font-size: .8rem; margin-top: .35rem; }
.upload-label { color: var(--c-primary); cursor: pointer; font-weight: 500; text-decoration: underline; }

.preview-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: .75rem;
    margin-top: 1rem;
}
.preview-item { display: flex; flex-direction: column; align-items: center; gap: .35rem; }
.preview-item img { width: 100%; aspect-ratio: 1; object-fit: cover; border-radius: 6px; }
.preview-item span { font-size: .7rem; color: var(--c-muted); max-width: 100%; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* ---- Admin album list ---- */
.admin-album-list { display: flex; flex-direction: column; gap: .75rem; }
.admin-album-row {
    background: var(--c-surface);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: .75rem 1rem;
    flex-wrap: wrap;
}
.admin-album-cover {
    width: 72px;
    height: 54px;
    border-radius: 6px;
    overflow: hidden;
    flex-shrink: 0;
    background: var(--c-bg);
}
.admin-album-cover img { width: 100%; height: 100%; object-fit: cover; display: block; }
.admin-album-cover .album-cover-empty.small { height: 100%; color: #94a3b8; }
.admin-album-info {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: .15rem;
    min-width: 0;
}
.admin-album-info strong { font-size: .95rem; }
.admin-album-info .text-muted { font-size: .8rem; color: var(--c-muted); }
.admin-album-actions { display: flex; gap: .5rem; flex-wrap: wrap; }

/* ---- Manage photos grid ---- */
.manage-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 1rem;
}
.manage-item {
    background: var(--c-bg);
    border-radius: var(--radius);
    overflow: hidden;
    display: flex;
    flex-direction: column;
}
.manage-item img {
    width: 100%;
    aspect-ratio: 4/3;
    object-fit: cover;
    display: block;
}
.manage-item-info {
    padding: .5rem .6rem;
    display: flex;
    flex-direction: column;
    gap: .1rem;
    font-size: .75rem;
    color: var(--c-muted);
    flex: 1;
}
.manage-item-info span:first-child { color: var(--c-text); font-weight: 500; word-break: break-all; }
.manage-item form { padding: .5rem .6rem; padding-top: 0; }
.manage-item .btn-danger { width: 100%; justify-content: center; }

.text-muted { color: var(--c-muted); }

/* ---- Responsive ---- */
@media (max-width: 600px) {
    .header-inner { height: auto; padding: .6rem 1rem; flex-wrap: wrap; }
    .main-content { padding: 1rem .75rem 2rem; }
    .photo-grid { grid-template-columns: repeat(auto-fill, minmax(130px, 1fr)); }
    .album-grid { grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); }
    .lightbox-arrow { font-size: 1.8rem; padding: .3rem .5rem; }
    .admin-album-row { flex-wrap: wrap; }
}