:root {
    --sf-green: #16a34a;
    --sf-green-dark: #15803d;
    --sf-dark: #0f172a;
    --sf-surface: #f8fafc;
    --sf-border: #e2e8f0;
    --sf-text: #0f172a;
    --sf-text-2: #475569;
    --sf-text-3: #94a3b8;
    --sf-radius: 8px;
    --sf-red: #dc2626;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    color: var(--sf-text);
    background: var(--sf-surface);
}

.sf-login-body {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: var(--sf-dark);
}

.sf-login-card {
    background: #fff;
    border-radius: var(--sf-radius);
    padding: 40px;
    width: 320px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, .3);
}

.sf-login-card h1 { margin: 0 0 4px; font-size: 22px; }
.sf-muted { color: var(--sf-text-3); font-size: 13px; }

.sf-login-card form { display: flex; flex-direction: column; gap: 14px; margin-top: 20px; }
.sf-login-card label { display: flex; flex-direction: column; gap: 6px; font-size: 13px; color: var(--sf-text-2); }

input[type=text], input[type=password], input[type=file], select {
    padding: 9px 12px;
    border: 1px solid var(--sf-border);
    border-radius: 6px;
    font-size: 14px;
}

button {
    background: var(--sf-green);
    color: #fff;
    border: none;
    border-radius: 6px;
    padding: 10px 16px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
}
button:hover { background: var(--sf-green-dark); }

.sf-btn-link { background: none; color: var(--sf-red); border: none; padding: 0; font-size: 13px; text-decoration: underline; cursor: pointer; }
.sf-btn-danger { background: var(--sf-red); }

.sf-topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: var(--sf-dark);
    color: #fff;
    padding: 14px 28px;
}
.sf-topbar-brand { font-weight: 700; }
.sf-topbar-brand .sf-muted { color: #94a3b8; }
.sf-topbar-nav a {
    color: #cbd5e1;
    text-decoration: none;
    margin-left: 18px;
    font-size: 13px;
}
.sf-topbar-nav a:hover { color: #fff; }
.sf-topbar-logout { color: #fca5a5 !important; }

.sf-main {
    max-width: 1100px;
    margin: 0 auto;
    padding: 32px 28px;
}

.sf-table {
    width: 100%;
    border-collapse: collapse;
    background: #fff;
    border-radius: var(--sf-radius);
    overflow: hidden;
    box-shadow: 0 1px 3px rgba(0, 0, 0, .06);
}
.sf-table th, .sf-table td {
    text-align: left;
    padding: 10px 14px;
    border-bottom: 1px solid var(--sf-border);
    font-size: 13px;
}
.sf-table th { background: var(--sf-surface); color: var(--sf-text-2); font-weight: 600; }

.sf-table-results { overflow-x: auto; display: block; white-space: nowrap; }

.sf-positive { color: var(--sf-green-dark); font-weight: 600; }
.sf-negative { color: var(--sf-red); font-weight: 600; }

.sf-form-inline { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; margin-top: 12px; }

.sf-checkbox-row { display: flex; align-items: center; gap: 8px; padding: 8px 0; font-size: 14px; }

.sf-alert { padding: 12px 16px; border-radius: 6px; margin-bottom: 16px; font-size: 13px; }
.sf-alert-error { background: #fef2f2; color: var(--sf-red); border: 1px solid #fecaca; }
.sf-alert-ok { background: #f0fdf4; color: var(--sf-green-dark); border: 1px solid #bbf7d0; }

.sf-danger-zone { background: #fff; border: 1px solid #fecaca; border-radius: var(--sf-radius); padding: 20px; margin-top: 20px; }
.sf-danger-zone h2 { color: var(--sf-red); margin-top: 0; font-size: 16px; }