body {
    min-height: 100vh;
    margin: 0;
    background:
        radial-gradient(ellipse at 20% 50%, rgba(26, 43, 74, 0.18) 0%, transparent 60%),
        radial-gradient(ellipse at 80% 20%, rgba(59, 130, 246, 0.12) 0%, transparent 50%),
        linear-gradient(135deg, #0f172a 0%, #1e3a5f 40%, #1a2b4a 70%, #0f2744 100%);
    display: flex;
    align-items: center;
    justify-content: center;
}

body::before {
    content: '';
    position: fixed;
    inset: 0;
    background-image:
        radial-gradient(circle at 15% 85%, rgba(59, 130, 246, 0.08) 0%, transparent 40%),
        radial-gradient(circle at 85% 15%, rgba(99, 179, 237, 0.06) 0%, transparent 40%);
    pointer-events: none;
}

.login-card {
    width: 100%;
    max-width: 420px;
    border: none;
    box-shadow:
        0 0 0 1px rgba(255,255,255,0.07),
        0 20px 60px rgba(0, 0, 0, 0.5),
        0 8px 24px rgba(0, 0, 0, 0.3);
    background: rgba(255, 255, 255, 0.97);
    backdrop-filter: blur(12px);
    border-radius: 16px !important;
    overflow: hidden;
}

.card-header-tkw {
    background: linear-gradient(135deg, #1a2b4a 0%, #243b6e 100%);
    padding: 2rem 1.5rem;
    text-align: center;
    border-bottom: 1px solid rgba(255,255,255,0.08);
    position: relative;
    overflow: hidden;
}

.card-header-tkw::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0; right: 0;
    height: 3px;
    background: linear-gradient(90deg, transparent, #3b82f6, #60a5fa, transparent);
}

.login-logo { height: 44px; }

.card-body {
    background: #ffffff;
}

h5.fw-semibold {
    color: #1e3a5f !important;
}

.input-group-text {
    background: #f1f5f9;
    border-color: #e2e8f0;
    color: #64748b;
}

.form-control {
    border-color: #e2e8f0;
}

.form-control:focus {
    border-color: #3b82f6;
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.12);
}

.btn-primary {
    background: linear-gradient(135deg, #1a2b4a, #243b6e);
    border: none;
    padding: 0.65rem;
    letter-spacing: 0.02em;
    transition: opacity 0.2s, transform 0.1s;
}

.btn-primary:hover {
    opacity: 0.92;
    transform: translateY(-1px);
    background: linear-gradient(135deg, #1a2b4a, #243b6e);
    border: none;
}

.btn-primary:active {
    transform: translateY(0);
}