:root {
    --bg: #f6f7f8;
    --surface: #ffffff;
    --text: #1f2933;
    --muted: #6b7280;
    --border: #e5e7eb;
    --primary: #ff8000;
    --primary-dark: #d96d00;
    --danger: #b42318;
    --warning: #9a6700;
    --radius: 10px;
    --shadow: 0 8px 24px rgba(0,0,0,.06);
    --max-width: 1440px;
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
body { margin:0; background:var(--bg); color:var(--text); }
a { color:inherit; }

.topbar {
    position: sticky; top:0; z-index:20;
    display:flex; align-items:center; gap:28px;
    min-height:64px; padding:0 24px;
    background:var(--surface); border-bottom:1px solid var(--border);
}
.brand { font-weight:800; letter-spacing:.08em; text-decoration:none; white-space:nowrap; }
.brand span { color:var(--primary); }
.main-nav { display:flex; gap:6px; flex:1; }
.main-nav a {
    text-decoration:none; padding:10px 12px; border-radius:8px; color:#374151;
}
.main-nav a:hover { background:#f3f4f6; }
.user-menu { display:flex; align-items:center; gap:12px; font-size:14px; }
.link-button { border:0; background:none; cursor:pointer; color:var(--muted); }
.nav-toggle { display:none; border:0; background:none; font-size:24px; }

.container { max-width:var(--max-width); margin:0 auto; padding:32px 24px; }
.page-header { margin-bottom:24px; }
.page-header h1 { margin:0 0 6px; font-size:32px; }
.eyebrow { margin:0 0 4px; color:var(--primary-dark); font-weight:700; font-size:13px; text-transform:uppercase; letter-spacing:.08em; }
.muted { color:var(--muted); }

.stats-grid {
    display:grid;
    grid-template-columns:repeat(4,minmax(0,1fr));
    gap:16px;
    margin-bottom:24px;
}
.stat-card, .panel, .login-card {
    background:var(--surface);
    border:1px solid var(--border);
    border-radius:var(--radius);
    box-shadow:var(--shadow);
}
.stat-card { padding:20px; }
.stat-card strong { display:block; margin-top:8px; font-size:28px; }
.stat-label { color:var(--muted); font-size:14px; }

.panel { padding:22px; }
.panel-header { display:flex; justify-content:space-between; align-items:center; }
.panel h2 { margin:0; font-size:20px; }
.empty-state { padding:40px 0; text-align:center; color:var(--muted); }

.auth-shell {
    min-height:100vh; display:grid; place-items:center; padding:24px;
    background:linear-gradient(180deg,#ffffff 0,#f3f4f6 100%);
}
.login-card { width:min(100%,420px); padding:32px; }
.login-brand { margin-bottom:28px; }
.login-card h1 { margin-bottom:6px; }
.form-stack { display:grid; gap:18px; margin-top:24px; }
.form-stack label { display:grid; gap:7px; font-weight:600; font-size:14px; }
input {
    width:100%; padding:12px 13px; border:1px solid #cfd4dc; border-radius:8px;
    font:inherit; background:white;
}
input:focus { outline:2px solid rgba(255,128,0,.22); border-color:var(--primary); }
.btn { border:0; border-radius:8px; padding:12px 16px; font:inherit; font-weight:700; cursor:pointer; }
.btn.primary { background:var(--primary); color:white; }
.btn.primary:hover { background:var(--primary-dark); }
.alert { margin-top:18px; padding:12px 14px; border-radius:8px; font-size:14px; }
.alert.error { background:#fef3f2; color:var(--danger); }
.alert.warning { background:#fff7e6; color:var(--warning); }
.forgot-link { display:inline-block; margin-top:18px; font-size:14px; color:var(--muted); }

@media (max-width: 980px) {
    .stats-grid { grid-template-columns:repeat(2,minmax(0,1fr)); }
    .nav-toggle { display:block; margin-left:auto; }
    .main-nav {
        display:none; position:absolute; top:64px; left:0; right:0;
        background:white; border-bottom:1px solid var(--border); padding:12px 20px;
        flex-direction:column;
    }
    .main-nav.is-open { display:flex; }
    .user-menu span { display:none; }
}
@media (max-width: 600px) {
    .container { padding:20px 14px; }
    .stats-grid { grid-template-columns:1fr; }
    .topbar { padding:0 14px; gap:12px; }
    .user-menu { margin-left:0; }
}