:root {
    --primary: #1e4fa3;
    --primary-dark: #153a78;
    --accent: #2fa4e7;
    --success: #2e9f4b;
    --danger: #d64545;
    --warning: #e8a11c;
    --border: #dfe7f1;
    --surface: #f7fbff;
    --text: #203245;
}

* { box-sizing: border-box; }
body {
    margin: 0;
    font-family: Arial, sans-serif;
    color: var(--text);
    background: linear-gradient(135deg, #eef6ff 0%, #f9fbff 100%);
}
.page-shell { min-height: 100vh; }
.topbar { display: flex; justify-content: space-between; align-items: center; padding: 20px 30px; background: var(--primary); color: white; }
.brand-block h1 { margin: 0; font-size: 1.3rem; }
.brand-block p { margin: 4px 0 0; opacity: .9; }
.topbar-actions { display: flex; gap: 10px; align-items: center; }
.user-pill { background: rgba(255,255,255,.2); padding: 8px 12px; border-radius: 999px; }
.layout { display: grid; grid-template-columns: 240px 1fr; min-height: calc(100vh - 84px); }
.sidebar { background: #fff; padding: 24px 18px; border-right: 1px solid var(--border); }
.sidebar h3 { margin-top: 0; color: var(--primary-dark); }
.sidebar a { display: block; padding: 10px 12px; margin-bottom: 8px; text-decoration: none; color: var(--text); border-radius: 8px; }
.sidebar a:hover { background: var(--surface); }
.content { padding: 24px 30px; }
.card { background: white; border: 1px solid var(--border); border-radius: 16px; padding: 20px; box-shadow: 0 10px 25px rgba(30,79,163,.06); }
.grid { display: grid; gap: 16px; }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.stats-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px; }
.stat-card { background: white; border-radius: 14px; padding: 18px; border: 1px solid var(--border); }
.stat-card h3 { margin: 0 0 8px; font-size: 1rem; color: #567; }
.stat-card .value { font-size: 1.6rem; font-weight: 700; color: var(--primary); }
.btn { display: inline-block; padding: 10px 15px; border-radius: 10px; text-decoration: none; border: none; cursor: pointer; font-weight: 700; }
.btn-primary { background: var(--primary); color: white; }
.btn-secondary { background: #e8eff9; color: var(--primary-dark); }
.btn-success { background: var(--success); color: white; }
form { display: grid; gap: 12px; }
label { font-weight: 600; }
input, select, textarea { width: 100%; padding: 10px 12px; border: 1px solid var(--border); border-radius: 10px; }
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; }
th, td { padding: 10px 12px; border-bottom: 1px solid var(--border); text-align: left; }
.badge { display: inline-block; padding: 6px 10px; border-radius: 999px; font-size: .8rem; font-weight: 700; }
.badge-warning { background: #fff3d7; color: #8a5a00; }
.badge-success { background: #e8f9ee; color: #1f7c42; }
.badge-danger { background: #fde9e9; color: #a13232; }
.auth-card { max-width: 480px; margin: 50px auto; background: white; padding: 30px; border-radius: 16px; box-shadow: 0 15px 35px rgba(0,0,0,.08); }
.small { color: #678; font-size: .9rem; }
.mt { margin-top: 12px; }
.mb { margin-bottom: 12px; }
.row { display: grid; gap: 16px; grid-template-columns: repeat(2, 1fr); }
.file-list { display: flex; flex-direction: column; gap: 8px; }
.file-item { padding: 10px 12px; border: 1px solid var(--border); border-radius: 10px; }
@media (max-width: 900px) {
    .layout { grid-template-columns: 1fr; }
    .sidebar { border-right: none; border-bottom: 1px solid var(--border); }
    .stats-grid, .grid-4, .grid-2, .row { grid-template-columns: 1fr; }
}