:root {
    --primary: #1f6feb;
    --primary-dark: #164ea6;
    --surface: rgba(255,255,255,.92);
    --text: #132033;
    --muted: #64748b;
}

* { box-sizing: border-box; }
body {
    min-height: 100vh;
    margin: 0;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    background:
        radial-gradient(circle at 15% 10%, rgba(31,111,235,.20), transparent 30%),
        radial-gradient(circle at 85% 15%, rgba(14,165,233,.22), transparent 28%),
        linear-gradient(135deg, #eaf2ff 0%, #f8fafc 48%, #ecfeff 100%);
    color: var(--text);
}

.login-shell {
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 24px;
}

.login-card {
    width: min(100%, 430px);
    background: var(--surface);
    backdrop-filter: blur(16px);
    border: 1px solid rgba(148,163,184,.28);
    border-radius: 28px;
    padding: 34px;
    box-shadow: 0 24px 70px rgba(15, 23, 42, .16);
}

.brand-badge {
    width: 62px;
    height: 62px;
    border-radius: 20px;
    display: grid;
    place-items: center;
    background: linear-gradient(135deg, var(--primary), #22c55e);
    color: white;
    font-size: 28px;
    margin-bottom: 18px;
    box-shadow: 0 14px 30px rgba(31,111,235,.3);
}

h1 {
    font-size: 2rem;
    font-weight: 800;
    letter-spacing: -.04em;
    margin: 0;
}

.subtitle {
    color: var(--muted);
    margin: 8px 0 26px;
}

.form-control, .input-group-text {
    border-radius: 14px;
    border-color: #dbe3ef;
}

.input-group .input-group-text { border-top-right-radius: 0; border-bottom-right-radius: 0; }
.input-group .form-control { border-top-left-radius: 0; border-bottom-left-radius: 0; }

.btn-primary {
    border: 0;
    border-radius: 16px;
    padding: 12px 16px;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    font-weight: 700;
}

.login-help {
    margin-top: 20px;
    padding: 12px 14px;
    border-radius: 16px;
    background: #f8fafc;
    color: var(--muted);
    font-size: .9rem;
    text-align: center;
}