:root {
            --primary: #2563eb;
            --bg: #f1f5f9;
            --card: #fff;
            --muted: #64748b;
            --danger: #dc2626;
            --success: #16a34a;
            --warning: #f59e0b;
        }

        * {
            box-sizing: border-box;
            font-family: system-ui, -apple-system, sans-serif;
        }

        body {
            margin: 0;
            background: var(--bg);
            -webkit-tap-highlight-color: transparent;
        }

        header {
            background: var(--primary);
            color: #fff;
            padding: 16px;
            text-align: center;
            font-weight: 600;
            position: sticky;
            top: 0;
            z-index: 10;
        }

        .container {
            padding: 16px;
            max-width: 520px;
            margin: auto;
        }

        .hidden {
            display: none !important;
        }

        .card {
            background: var(--card);
            border-radius: 16px;
            padding: 24px;
            margin-top: 32px;
            box-shadow: 0 6px 18px rgba(0, 0, 0, .1);
            text-align: center;
        }

        .card h2 {
            margin: 0 0 24px 0;
            font-size: 24px;
            color: #1e293b;
        }

        label {
            font-size: 14px;
            color: var(--muted);
            margin-top: 16px;
            display: block;
            text-align: left;
        }

        .input-group {
            position: relative;
            margin-top: 8px;
        }

        input {
            width: 100%;
            padding: 12px 40px 12px 12px;
            border-radius: 10px;
            border: 1px solid #cbd5f5;
            font-size: 16px;
        }

        input.invalid {
            border-color: var(--danger);
        }

        .password-toggle {
            position: absolute;
            right: 12px;
            top: 50%;
            transform: translateY(-50%);
            color: var(--muted);
            cursor: pointer;
            font-size: 18px;
        }

        .password-toggle:hover {
            color: var(--primary);
        }

        .actions {
            display: flex;
            flex-direction: column;
            gap: 12px;
            margin-top: 24px;
        }

        .btn {
            padding: 14px;
            border: none;
            border-radius: 12px;
            font-weight: 600;
            font-size: 16px;
            cursor: pointer;
        }

        .primary {
            background: var(--primary);
            color: #fff;
        }

        .secondary {
            background: #e5e7eb;
            color: #374151;
        }

        .toggle-link {
            margin-top: 20px;
            color: var(--primary);
            font-size: 15px;
            cursor: pointer;
            text-decoration: underline;
        }

        .logo-icon {
            font-size: 64px;
            color: var(--primary);
            margin-bottom: 16px;
        }

        .error-msg {
            color: var(--danger);
            font-size: 14px;
            margin: 16px 0;
            text-align: center;
        }

        .success-msg {
            color: var(--success);
            font-size: 15px;
            line-height: 1.5;
            margin: 20px 0;
            padding: 14px;
            background-color: #ecfdf5;
            border: 1px solid #a7f3d0;
            border-radius: 10px;
            white-space: pre-line;
            text-align: center;
        }

        .warning-msg {
            color: var(--warning);
            font-size: 14px;
            margin: 16px 0 0 0;
            text-align: center;
            background: #fffbeb;
            padding: 12px;
            border-radius: 10px;
            border: 1px solid var(--warning);
        }