:root {
    --primary: #1e40af; /* biru tua — branding utama */
    --primary-light: #3b82f6; /* biru sedang */
    --primary-bg: #eff6ff; /* biru sangat muda */
    --surface: #ffffff;
    --text: #1e293b;
    --border: #e2e8f0;
    --shadow: 0 4px 12px rgba(30, 64, 175, 0.12);
}

body {
    background-color: #f8fafc;
    font-family: "Segoe UI", system-ui, sans-serif;
    color: var(--text);
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    margin: 0;
    padding: 1rem;
}

.auth-wrapper {
    width: 100%;
    max-width: 870px;
}

.auth-card {
    background: var(--surface);
    border-radius: 12px;
    box-shadow: var(--shadow);
    overflow: hidden;
    transition: transform 0.3s ease;
}

.auth-card:hover {
    transform: translateY(-2px);
}

.auth-header {
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: white;
    padding: 1.75rem 1.5rem;
    text-align: center;
}

.auth-header h1 {
    font-weight: 700;
    font-size: 1.75rem;
    margin: 0;
}

.auth-header .logo-icon {
    margin-right: 8px;
}

.auth-body {
    padding: 2rem;
}

.form-label {
    font-weight: 600;
    color: #334155;
    margin-bottom: 0.5rem;
}

.input-group-text {
    background-color: #f1f5f9;
    border-right: none;
}

.form-control:focus {
    border-color: var(--primary-light);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.25);
}

.btn-primary {
    background-color: var(--primary);
    border-color: var(--primary);
    padding: 0.65rem;
    font-weight: 600;
    transition: all 0.2s ease;
}

.btn-primary:hover {
    background-color: #1d4ed8;
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(30, 64, 175, 0.3);
}

.footer-links {
    text-align: center;
    margin-top: 1.25rem;
}

.footer-links a {
    color: var(--primary-light);
    text-decoration: none;
    font-weight: 500;
}

.footer-links a:hover {
    text-decoration: underline;
}

.alert {
    border-radius: 8px;
}

/* Animasi subtle */
.fade-in {
    animation: fadeIn 0.6s ease forwards;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Optional: Dark mode vars (bisa diaktifkan nanti) */
[data-theme="dark"] {
    --primary: #3b82f6;
    --primary-light: #60a5fa;
    --primary-bg: #1e293b;
    --surface: #0f172a;
    --text: #f1f5f9;
    --border: #334155;
}

[data-theme="dark"] body {
    background-color: #020617;
}