:root {
    --bg: #0f172a;
    --bg-soft: #111c35;
    --card: #ffffff;
    --text: #172033;
    --muted: #6b7280;
    --line: #e5e7eb;
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --danger: #dc2626;
    --success: #16a34a;
    --shadow: 0 22px 60px rgba(15, 23, 42, .13);
    --radius: 22px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    background: #f4f7fb;
    color: var(--text);
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.container { width: min(1180px, calc(100% - 32px)); margin: 0 auto; }

.site-header {
    background: linear-gradient(135deg, #111827, #172554 55%, #1e40af);
    color: #fff;
    position: sticky;
    top: 0;
    z-index: 10;
    box-shadow: 0 10px 35px rgba(15, 23, 42, .25);
}
.header-wrap { display: flex; align-items: center; justify-content: space-between; gap: 20px; padding: 16px 0; }
.logo { display: flex; align-items: center; gap: 12px; }
.logo-mark {
    width: 44px; height: 44px; border-radius: 14px;
    background: rgba(255, 255, 255, .16);
    display: grid; place-items: center;
    font-weight: 900;
    border: 1px solid rgba(255, 255, 255, .25);
}
.logo strong { display: block; font-size: 18px; }
.logo small { display: block; color: #cbd5e1; margin-top: 2px; }
.main-nav { display: flex; gap: 6px; flex-wrap: wrap; justify-content: flex-end; }
.main-nav a {
    color: #dbeafe;
    padding: 9px 12px;
    border-radius: 999px;
    font-size: 14px;
}
.main-nav a:hover, .main-nav a.active { background: rgba(255, 255, 255, .15); color: #fff; }
.main-content { padding: 34px 0 48px; }

.hero {
    background: radial-gradient(circle at 20% 20%, rgba(59, 130, 246, .35), transparent 35%), linear-gradient(135deg, #0f172a, #1e3a8a);
    color: #fff;
    border-radius: 32px;
    padding: 34px;
    display: grid;
    grid-template-columns: 1.2fr .8fr;
    gap: 24px;
    align-items: center;
    box-shadow: var(--shadow);
    margin-bottom: 30px;
}
.badge {
    display: inline-flex;
    padding: 8px 12px;
    background: rgba(255, 255, 255, .12);
    border: 1px solid rgba(255, 255, 255, .2);
    border-radius: 999px;
    color: #bfdbfe;
    font-size: 14px;
}
.hero h1 { font-size: clamp(34px, 5vw, 58px); line-height: 1; margin: 16px 0; }
.hero p { color: #dbeafe; font-size: 17px; max-width: 680px; }
.search-box {
    background: #fff;
    padding: 12px;
    border-radius: 20px;
    display: flex;
    gap: 10px;
    box-shadow: 0 16px 40px rgba(0,0,0,.18);
}
.search-box input {
    border: 0;
    flex: 1;
    min-width: 0;
    padding: 14px 12px;
    font-size: 16px;
    outline: none;
}
.search-box button, .btn, .download-btn {
    border: 0;
    cursor: pointer;
    background: var(--primary);
    color: #fff;
    padding: 13px 18px;
    border-radius: 14px;
    font-weight: 800;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: .15s ease;
}
.search-box button:hover, .btn:hover, .download-btn:hover { background: var(--primary-dark); transform: translateY(-1px); }
.btn-small { padding: 9px 12px; border-radius: 11px; font-size: 14px; }
.btn-muted { background: #e5e7eb; color: #111827; }
.btn-muted:hover { background: #d1d5db; }

.page-heading { display: flex; align-items: flex-end; justify-content: space-between; gap: 16px; margin: 0 0 18px; }
.page-heading h2 { margin: 0; font-size: 28px; }
.page-heading p { margin: 0; color: var(--muted); }
.file-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; }
.file-card {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(15, 23, 42, .06);
    display: flex;
    flex-direction: column;
}
.cover { aspect-ratio: 16 / 10; background: #e2e8f0; overflow: hidden; }
.cover img { width: 100%; height: 100%; object-fit: cover; transition: .25s ease; }
.file-card:hover .cover img { transform: scale(1.04); }
.cover-placeholder {
    width: 100%; height: 100%;
    display: grid; place-items: center;
    background: linear-gradient(135deg, #1e3a8a, #2563eb);
    color: #fff;
    font-size: 42px;
    font-weight: 900;
}
.cover-placeholder.big { min-height: 320px; border-radius: var(--radius); }
.file-card-body { padding: 18px; display: flex; flex-direction: column; flex: 1; }
.meta-line { display: flex; gap: 10px; flex-wrap: wrap; color: var(--muted); font-size: 13px; margin-bottom: 10px; }
.meta-line span { background: #f1f5f9; padding: 5px 9px; border-radius: 999px; }
.file-card h3 { margin: 0 0 10px; font-size: 20px; line-height: 1.2; }
.file-card h3 a:hover { color: var(--primary); }
.file-card p { color: var(--muted); line-height: 1.55; margin: 0 0 16px; flex: 1; }
.card-actions { display: flex; align-items: center; justify-content: space-between; gap: 12px; color: var(--muted); font-size: 14px; }

.file-page {
    display: grid;
    grid-template-columns: 420px 1fr;
    gap: 28px;
    align-items: start;
    background: #fff;
    border-radius: 30px;
    padding: 24px;
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
}
.file-page-cover img { width: 100%; aspect-ratio: 16 / 11; object-fit: cover; border-radius: 22px; }
.file-page-info h1 { margin: 10px 0 12px; font-size: clamp(30px, 4vw, 48px); line-height: 1.05; }
.lead { color: var(--muted); font-size: 18px; line-height: 1.6; }
.specs { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; margin: 22px 0; }
.specs div { background: #f8fafc; border: 1px solid var(--line); border-radius: 16px; padding: 13px; }
.specs strong { display: block; font-size: 13px; color: var(--muted); margin-bottom: 5px; }
.download-btn { font-size: 18px; padding: 16px 24px; border-radius: 16px; }
.content-box {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 24px;
    padding: 24px;
    margin-top: 22px;
}
.content-box h2 { margin-top: 0; }
.description-text { line-height: 1.75; color: #334155; }
.empty-state { background: #fff; border: 1px dashed #cbd5e1; border-radius: 24px; padding: 44px; text-align: center; }
.empty-state h3, .empty-state h1 { margin-top: 0; }
.empty-state p { color: var(--muted); }
.pagination { display: flex; gap: 8px; justify-content: center; margin-top: 28px; }
.pagination a { padding: 10px 14px; border-radius: 12px; background: #fff; border: 1px solid var(--line); }
.pagination a.active { background: var(--primary); color: #fff; }

.site-footer { background: #0f172a; color: #cbd5e1; padding: 28px 0; }
.footer-wrap { display: flex; justify-content: space-between; gap: 20px; align-items: center; }
.footer-wrap strong { display: block; color: #fff; margin-bottom: 4px; }
.footer-links { display: flex; gap: 14px; }
.footer-links a:hover { color: #fff; }
.alert { padding: 14px 16px; border-radius: 14px; margin-bottom: 16px; }
.alert-success { background: #dcfce7; color: #166534; }
.alert-error { background: #fee2e2; color: #991b1b; }

.admin-body { background: #eef2f7; }
.admin-topbar { background: #111827; color: #fff; }
.admin-topbar-inner { display: flex; justify-content: space-between; align-items: center; gap: 18px; padding: 14px 0; }
.admin-brand { font-weight: 900; font-size: 18px; }
.admin-nav { display: flex; gap: 8px; flex-wrap: wrap; justify-content: flex-end; }
.admin-nav a { padding: 8px 11px; border-radius: 10px; color: #dbeafe; }
.admin-nav a:hover { background: rgba(255,255,255,.12); color: #fff; }
.admin-main { padding: 28px 0 48px; }
.admin-heading { display: flex; justify-content: space-between; align-items: center; gap: 18px; margin-bottom: 20px; }
.admin-heading h1 { margin: 0 0 6px; font-size: 32px; }
.admin-heading p { margin: 0; color: var(--muted); }
.stats-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px; margin-bottom: 20px; }
.stat-card { background: #fff; border-radius: 20px; padding: 20px; border: 1px solid var(--line); box-shadow: 0 12px 30px rgba(15, 23, 42, .06); }
.stat-card strong { display: block; font-size: 34px; line-height: 1; margin-bottom: 8px; color: var(--primary); }
.stat-card span { color: var(--muted); }
.admin-panel, .login-card {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 22px;
    padding: 20px;
    box-shadow: 0 12px 35px rgba(15, 23, 42, .06);
}
.login-card { max-width: 430px; margin: 40px auto; }
.login-card h1 { margin-top: 0; }
.panel-header { display: flex; justify-content: space-between; align-items: center; gap: 14px; margin-bottom: 14px; }
.panel-header h2 { margin: 0; }
.table-wrap { overflow-x: auto; }
.admin-table { width: 100%; border-collapse: collapse; min-width: 760px; }
.admin-table th, .admin-table td { padding: 12px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: middle; }
.admin-table th { color: var(--muted); font-size: 13px; text-transform: uppercase; letter-spacing: .04em; }
.admin-table a { color: var(--primary); font-weight: 700; }
.actions-cell { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; }
.actions-cell form { margin: 0; }
.link-button { background: transparent; border: 0; padding: 0; color: var(--primary); cursor: pointer; font-weight: 700; font: inherit; }
.link-button.danger { color: var(--danger); }
.muted { color: var(--muted); }
.admin-form { display: grid; gap: 12px; }
.admin-form label { font-weight: 800; }
.admin-form input[type="text"], .admin-form input[type="email"], .admin-form input[type="password"], .admin-form input[type="url"], .admin-form input[type="number"], .admin-form select, .admin-form textarea, .admin-search input {
    width: 100%;
    border: 1px solid #d1d5db;
    border-radius: 13px;
    padding: 12px 13px;
    font: inherit;
    background: #fff;
}
.admin-form textarea { resize: vertical; }
.form-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.form-grid.four { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.check-row { display: flex; gap: 20px; flex-wrap: wrap; margin: 4px 0; }
.check-row label { font-weight: 600; }
.form-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 8px; }
.admin-search { display: flex; gap: 10px; margin-bottom: 14px; }
.admin-columns { display: grid; grid-template-columns: 380px 1fr; gap: 20px; align-items: start; }

@media (max-width: 920px) {
    .header-wrap, .footer-wrap, .admin-topbar-inner { flex-direction: column; align-items: flex-start; }
    .main-nav, .admin-nav { justify-content: flex-start; }
    .hero { grid-template-columns: 1fr; padding: 24px; }
    .file-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .file-page { grid-template-columns: 1fr; }
    .specs { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .stats-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .admin-columns { grid-template-columns: 1fr; }
    .form-grid, .form-grid.four { grid-template-columns: 1fr; }
}

@media (max-width: 600px) {
    .container { width: min(100% - 22px, 1180px); }
    .search-box, .admin-search { flex-direction: column; }
    .file-grid { grid-template-columns: 1fr; }
    .specs, .stats-grid { grid-template-columns: 1fr; }
    .admin-heading { flex-direction: column; align-items: flex-start; }
    .empty-state { padding: 28px 18px; }
}