*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

        :root {
            --bg:       #f0f9ff;
            --text:     #071b22;
            --muted:    #64767d;
            --border:   #dde8ec;
            --teal:     #0098b3;
            --teal-dark:#007f96;
            --yellow:   #ffc20e;
            --sidebar:  #004d5a;
            --red:      #dc2626;
            --shadow:   0 20px 50px rgba(8,38,47,.10);
        }

        body {
            font-family: 'Plus Jakarta Sans', sans-serif;
            background: var(--bg);
            min-height: 100vh;
            display: grid;
            grid-template-columns: 1fr 1fr;
        }

        /* ── Panel kiri — ilustrasi ── */
        .left-panel {
            background: linear-gradient(135deg, var(--sidebar) 0%, #0098b3 100%);
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: flex-start;
            padding: 60px;
            color: white;
            position: relative;
            overflow: hidden;
        }

        .left-panel::before {
            content: '';
            position: absolute;
            width: 500px; height: 500px;
            border-radius: 50%;
            background: rgba(255,255,255,.04);
            top: -150px; right: -150px;
        }

        .left-panel::after {
            content: '';
            position: absolute;
            width: 300px; height: 300px;
            border-radius: 50%;
            background: rgba(255,194,14,.08);
            bottom: -80px; left: -80px;
        }

        .brand {
            display: flex;
            align-items: center;
            gap: 14px;
            margin-bottom: 60px;
            position: relative; z-index: 1;
        }

        .brand-icon {
            width: 48px; height: 48px;
            background: var(--yellow);
            border-radius: 14px;
            display: flex; align-items: center; justify-content: center;
            box-shadow: 0 8px 20px rgba(255,194,14,.3);
        }

        .brand-icon svg {
            width: 26px; height: 26px;
            fill: none; stroke: #0b1b20;
            stroke-width: 2.5; stroke-linecap: round; stroke-linejoin: round;
        }

        .brand-text {
            font-size: 20px;
            font-weight: 800;
            letter-spacing: -0.03em;
            line-height: 1.2;
        }

        .brand-text span { color: var(--yellow); }

        .left-content { position: relative; z-index: 1; }

        .left-content h1 {
            font-size: clamp(32px, 4vw, 48px);
            font-weight: 800;
            letter-spacing: -0.05em;
            line-height: 1.1;
            margin-bottom: 18px;
        }

        .left-content h1 span { color: var(--yellow); }

        .left-content p {
            font-size: 17px;
            color: rgba(255,255,255,.75);
            line-height: 1.7;
            max-width: 380px;
            margin-bottom: 40px;
        }

        .feature-list {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .feature-list li {
            display: flex;
            align-items: center;
            gap: 12px;
            font-size: 15px;
            color: rgba(255,255,255,.85);
            font-weight: 500;
        }

        .feature-list li::before {
            content: '✓';
            width: 22px; height: 22px;
            background: rgba(255,194,14,.2);
            border: 1px solid rgba(255,194,14,.4);
            border-radius: 50%;
            display: flex; align-items: center; justify-content: center;
            font-size: 12px;
            color: var(--yellow);
            font-weight: 700;
            flex-shrink: 0;
        }

        /* ── Panel kanan — form ── */
        .right-panel {
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 40px;
            background: white;
        }

        .login-card {
            width: 100%;
            max-width: 420px;
        }

        .login-card h2 {
            font-size: 28px;
            font-weight: 800;
            letter-spacing: -0.04em;
            color: var(--text);
            margin-bottom: 6px;
        }

        .login-card .subtitle {
            font-size: 15px;
            color: var(--muted);
            margin-bottom: 36px;
        }

        .alert-error {
            background: #fff1f2;
            border: 1px solid #fecaca;
            border-radius: 12px;
            padding: 14px 16px;
            color: var(--red);
            font-size: 14px;
            font-weight: 600;
            margin-bottom: 24px;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .alert-error::before { content: '⚠'; font-size: 16px; }

        .form-group {
            margin-bottom: 20px;
        }

        .form-group label {
            display: block;
            font-size: 13px;
            font-weight: 700;
            color: var(--muted);
            text-transform: uppercase;
            letter-spacing: .06em;
            margin-bottom: 8px;
        }

        .form-group input {
            width: 100%;
            height: 48px;
            border: 1.5px solid var(--border);
            border-radius: 12px;
            padding: 0 16px;
            font-size: 15px;
            font-family: inherit;
            color: var(--text);
            background: #f8fbfc;
            outline: none;
            transition: border-color .18s, box-shadow .18s, background .18s;
        }

        .form-group input:focus {
            border-color: var(--teal);
            background: white;
            box-shadow: 0 0 0 4px rgba(0,152,179,.12);
        }

        .form-group input::placeholder { color: #b0bec5; }

        .btn-login {
            width: 100%;
            height: 52px;
            background: linear-gradient(135deg, var(--teal), var(--teal-dark));
            color: white;
            border: none;
            border-radius: 12px;
            font-size: 16px;
            font-weight: 800;
            font-family: inherit;
            cursor: pointer;
            margin-top: 8px;
            transition: transform .18s, box-shadow .18s;
            box-shadow: 0 8px 24px rgba(0,152,179,.28);
            letter-spacing: -0.02em;
        }

        .btn-login:hover {
            transform: translateY(-2px);
            box-shadow: 0 14px 32px rgba(0,152,179,.35);
        }

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

        .login-footer {
            text-align: center;
            margin-top: 28px;
            font-size: 13px;
            color: var(--muted);
        }

        .login-footer strong { color: var(--text); }

        /* ── Responsive ── */
        @media (max-width: 768px) {
            body { grid-template-columns: 1fr; }
            .left-panel { display: none; }
            .right-panel { padding: 32px 24px; }
        }