:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --bg: #ffffff;
    --surface: #f8fafc;
    --border: #e2e8f0;
    --text: #0f172a;
    --text-muted: #64748b;
    --danger: #dc2626;
    --danger-bg: #fef2f2;
    --radius: 10px;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
}

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

/* ---------- Navbar ---------- */
.navbar {
    border-bottom: 1px solid var(--border);
    background: var(--bg);
    position: sticky;
    top: 0;
    z-index: 50;
}
.navbar-inner {
    max-width: 1100px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 20px;
}
.brand { font-weight: 700; font-size: 20px; color: var(--text); }
.nav-links { display: flex; align-items: center; gap: 20px; }
.nav-links a { color: var(--text); font-weight: 500; }
.btn-nav {
    background: var(--primary);
    color: #fff !important;
    padding: 8px 16px;
    border-radius: var(--radius);
    text-decoration: none !important;
}
.nav-toggle { display: none; background: none; border: none; font-size: 22px; cursor: pointer; }

/* ---------- Layout ---------- */
.page-wrap { max-width: 1100px; margin: 0 auto; padding: 40px 20px; min-height: 70vh; }

/* ---------- Hero ---------- */
.hero { text-align: center; padding: 60px 0; }
.hero h1 { font-size: 34px; margin-bottom: 12px; }
.hero p { color: var(--text-muted); max-width: 560px; margin: 0 auto 28px; }
.hero-actions { display: flex; gap: 14px; justify-content: center; }

/* ---------- Buttons ---------- */
.btn {
    display: inline-block;
    padding: 11px 22px;
    border-radius: var(--radius);
    font-weight: 600;
    cursor: pointer;
    border: 1px solid transparent;
    text-decoration: none !important;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-outline { background: #fff; color: var(--primary); border-color: var(--primary); }
.btn-block { width: 100%; text-align: center; }

/* ---------- Auth cards ---------- */
.auth-wrap { display: flex; justify-content: center; padding: 40px 20px; }
.auth-card {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 32px;
    width: 100%;
    max-width: 380px;
    box-shadow: 0 4px 24px rgba(15, 23, 42, 0.04);
}
.auth-card h2 { margin-top: 0; margin-bottom: 20px; }
.auth-card label { display: block; font-size: 13px; font-weight: 600; margin: 14px 0 6px; }
.auth-card input {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 14px;
}
.auth-card input:focus { outline: none; border-color: var(--primary); }
.auth-card button { margin-top: 22px; }
.auth-switch { text-align: center; margin-top: 16px; font-size: 14px; color: var(--text-muted); }

.alert { padding: 10px 14px; border-radius: 8px; font-size: 14px; margin-bottom: 6px; }
.alert-error { background: var(--danger-bg); color: var(--danger); border: 1px solid #fecaca; }

/* ---------- Dashboard (user) ---------- */
.dash-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 16px; margin-bottom: 24px; }
.dash-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 6px;
}
.dash-label { font-size: 13px; color: var(--text-muted); }
.dash-value { font-size: 22px; font-weight: 700; }
.dash-actions { display: flex; gap: 12px; margin-bottom: 20px; }
.dash-note { color: var(--text-muted); font-size: 13px; }

/* ---------- Admin shell ---------- */
.admin-shell { display: flex; min-height: 100vh; }
.admin-sidebar {
    width: 240px;
    background: var(--surface);
    border-right: 1px solid var(--border);
    padding: 24px 16px;
    flex-shrink: 0;
}
.admin-brand { font-weight: 700; font-size: 18px; margin-bottom: 24px; }
.admin-sidebar nav { display: flex; flex-direction: column; gap: 4px; }
.admin-sidebar nav a {
    padding: 10px 12px;
    border-radius: 8px;
    color: var(--text);
    font-weight: 500;
    font-size: 14px;
}
.admin-sidebar nav a:hover, .admin-sidebar nav a.active { background: #eef2ff; color: var(--primary); text-decoration: none; }
.logout-link { color: var(--danger) !important; }
.sidebar-note { font-size: 12px; color: var(--text-muted); margin-top: 16px; line-height: 1.5; }
.admin-main { flex: 1; padding: 28px 32px; }
.admin-topbar { display: flex; justify-content: space-between; align-items: center; margin-bottom: 24px; }
.admin-topbar h1 { margin: 0; font-size: 22px; }
.admin-login-body { display: flex; align-items: center; min-height: 100vh; background: var(--surface); }

/* ---------- Error page ---------- */
.error-page { text-align: center; padding: 100px 20px; }
.error-page h1 { font-size: 64px; margin: 0; color: var(--primary); }

/* ---------- Footer ---------- */
.site-footer { text-align: center; padding: 24px; color: var(--text-muted); font-size: 13px; border-top: 1px solid var(--border); }

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
    .nav-toggle { display: block; }
    .nav-links {
        display: none;
        position: absolute;
        top: 56px;
        left: 0;
        right: 0;
        background: var(--bg);
        border-bottom: 1px solid var(--border);
        flex-direction: column;
        padding: 16px 20px;
        gap: 14px;
    }
    .nav-links.open { display: flex; }
    .admin-shell { flex-direction: column; }
    .admin-sidebar { width: 100%; border-right: none; border-bottom: 1px solid var(--border); }
}