:root {
            /* Tema Warna Merah Sinarmed Style */
            --brand-red: #D32F2F;       /* Merah Utama */
            --brand-dark: #8B0000;      /* Merah Gelap (Hover/Gradient) */
            --brand-light: #FFEBEE;     /* Merah Muda (Backgrounds) */
            --brand-text: #333333;      /* Warna Teks Utama */
            --bg-body: #F0F2F5;         /* Background Halaman */
            
            /* Gradient untuk Header & Tombol */
            --gradient-brand: linear-gradient(135deg, #D32F2F 0%, #B71C1C 100%);
        }

        body {
            height: 100vh;
            margin: 0;
            font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
            background-color: var(--bg-body);
            color: var(--brand-text);
        }

        /* Container Utama */
        .login-wrapper {
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 1rem;
        }

        .card-login {
            border: none;
            border-radius: 1rem;
            box-shadow: 0 10px 30px rgba(211, 47, 47, 0.15); /* Shadow merah tipis */
            overflow: hidden;
            width: 100%;
            max-width: 420px; /* Lebar optimal */
            background: white;
            display: flex;
            flex-direction: column;
        }

        /* Bagian Header Merah */
        .login-header {
            background: var(--gradient-brand);
            color: white;
            padding: 2.5rem 1.5rem;
            text-align: center;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            position: relative;
        }

        .brand-logo {
            font-size: 2.8rem;
            margin-bottom: 0.5rem;
            background: rgba(255, 255, 255, 0.2);
            padding: 15px;
            border-radius: 50%;
            backdrop-filter: blur(5px);
        }

        .login-header h3 {
            margin: 0;
            font-weight: 700;
            letter-spacing: 0.5px;
            text-transform: uppercase;
        }
        
        .login-header p {
            margin: 0.25rem 0 0 0;
            font-size: 0.85rem;
            opacity: 0.9;
            font-weight: 300;
        }

        /* Bagian Form */
        .login-body {
            padding: 2rem;
            background: white;
        }

        /* Styling Input */
        .input-group-custom {
            margin-bottom: 1.25rem;
            position: relative;
        }
        
        .form-label-mobile {
            display: block;
            margin-bottom: 0.5rem;
            font-size: 0.75rem;
            font-weight: 700;
            color: var(--brand-text);
            letter-spacing: 1px;
            margin-left: 0.2rem;
        }

        .form-control-lg-custom {
            font-size: 1rem; /* 16px anti-zoom */
            padding: 0.8rem 1rem;
            padding-left: 3rem; /* Space for icon */
            border-radius: 0.5rem;
            border: 1px solid #e0e0e0;
            background-color: #fcfcfc;
            color: var(--brand-text);
            transition: all 0.2s;
        }

        .form-control-lg-custom:focus {
            border-color: var(--brand-red);
            background-color: white;
            box-shadow: 0 0 0 4px rgba(211, 47, 47, 0.1); /* Focus ring merah */
            outline: none;
        }

        /* Ikon Input */
        .input-icon {
            position: absolute;
            left: 1rem;
            top: 2.5rem; /* Sesuai tinggi input + label */
            color: #aaa;
            z-index: 10;
            pointer-events: none;
            transition: color 0.2s;
        }
        
        .input-group-custom:focus-within .input-icon {
            color: var(--brand-red); /* Ikon jadi merah saat aktif */
        }
        
        .toggle-password-btn {
            position: absolute;
            right: 1rem;
            top: 2.5rem;
            color: #aaa;
            background: none;
            border: none;
            cursor: pointer;
            z-index: 10;
            font-size: 1.1rem;
            padding: 0;
        }
        
        .toggle-password-btn:hover {
            color: var(--brand-red);
        }

        /* Tombol Login Merah */
        .btn-brand {
            background: var(--gradient-brand);
            border: none;
            color: white;
            padding: 0.85rem;
            font-weight: 600;
            font-size: 1rem;
            border-radius: 0.5rem;
            width: 100%;
            margin-top: 0.5rem;
            box-shadow: 0 4px 10px rgba(183, 28, 28, 0.3);
            transition: all 0.3s;
            letter-spacing: 0.5px;
        }

        .btn-brand:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 15px rgba(183, 28, 28, 0.4);
            background: linear-gradient(135deg, #B71C1C 0%, #8B0000 100%);
            color: white;
        }

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

        /* Helper Links */
        .d-flex-links {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-top: -0.5rem;
            margin-bottom: 1.5rem;
            padding: 0 0.2rem;
        }
        
        .form-check-input:checked {
            background-color: var(--brand-red);
            border-color: var(--brand-red);
        }

        .link-brand {
            font-size: 0.8rem;
            text-decoration: none;
            color: var(--brand-red);
            font-weight: 600;
        }
        
        .link-brand:hover {
            text-decoration: underline;
            color: var(--brand-dark);
        }

        /* Error Messages */
        .text-error {
            color: var(--brand-red);
            font-size: 0.75rem;
            margin-top: 0.25rem;
            margin-left: 0.2rem;
            display: none;
            font-weight: 600;
        }

        /* Desktop Adjustment */
        @media (min-width: 768px) {
            .card-login {
                flex-direction: row;
                max-width: 850px;
            }
            .login-header {
                width: 40%;
                border-radius: 1rem 0 0 1rem;
                padding: 3rem;
            }
            .login-body {
                width: 60%;
                border-radius: 0 1rem 1rem 0;
                padding: 3rem;
            }
            .input-icon, .toggle-password-btn { top: 2.7rem; }
        }