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

        html, body {
            height: 100%;
            overflow: hidden;
        }

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background: linear-gradient(135deg, #4A8888 0%, #387070 100%);
            display: flex;
            justify-content: center;
            align-items: center;
            padding: 20px;
        }

        .container {
            background: white;
            border-radius: 16px;
            box-shadow: 0 15px 35px rgba(0, 0, 0, 0.2);
            overflow: hidden;
            width: 100%;
            max-width: 380px;
            border: 1px solid rgba(255, 255, 255, 0.2);
        }

        .header {
            background: linear-gradient(135deg, #4A8888 0%, #387070 100%);
            color: white;
            padding: 25px 20px;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .header::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100" opacity="0.1"><circle cx="20" cy="20" r="2" fill="white"/><circle cx="80" cy="40" r="1.5" fill="white"/><circle cx="40" cy="80" r="1" fill="white"/><circle cx="60" cy="20" r="1.2" fill="white"/></svg>');
        }

        .header h1 {
            font-size: 22px;
            margin-bottom: 6px;
            font-weight: 700;
            position: relative;
        }

        .header p {
            font-size: 13px;
            opacity: 0.9;
            font-weight: 400;
            position: relative;
        }

        .logo {
            width: 50px;
            height: 50px;
            margin: 0 auto 12px;
            background: rgba(255, 255, 255, 0.2);
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            position: relative;
        }

        .options {
            padding: 25px 20px;
            display: flex;
            flex-direction: column;
            align-items: center;
        }

        .option-button {
            width: 100%;
            padding: 14px 20px;
            margin: 6px 0;
            border: none;
            border-radius: 10px;
            background: #f8fafc;
            color: #2d3748;
            font-size: 15px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            border: 2px solid #e2e8f0;
            display: flex;
            align-items: center;
            justify-content: flex-start;
            gap: 12px;
            position: relative;
            overflow: hidden;
        }

        .option-button::before {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
            transition: left 0.5s;
        }

        .option-button:hover::before {
            left: 100%;
        }

        .option-button:hover {
            background: #4A8888;
            color: white;
            border-color: #4A8888;
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(74, 136, 136, 0.3);
        }

        .grafana {
            background: linear-gradient(135deg, #4A8888 0%, #387070 100%);
            color: white;
            border-color: #4A8888;
        }

        .grafana:hover {
            background: linear-gradient(135deg, #387070 0%, #2D5F5F 100%);
            box-shadow: 0 6px 20px rgba(74, 136, 136, 0.4);
        }

        .zoho {
            background: linear-gradient(135deg, #D8D3C4 0%, #c4bdab 100%);
            color: #2d3748;
            border-color: #D8D3C4;
        }

        .zoho:hover {
            background: linear-gradient(135deg, #c4bdab 0%, #b0a995 100%);
            color: #2d3748;
            box-shadow: 0 6px 20px rgba(216, 211, 196, 0.3);
        }

        .back-button {
            width: 100%;
            padding: 12px 20px;
            margin-top: 8px;
            border: none;
            border-radius: 10px;
            background: #6b7280;
            color: white;
            font-size: 14px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
        }

        .back-button:hover {
            background: #4b5563;
            transform: translateY(-1px);
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
        }

        .site-return-button {
            width: 100%;
            padding: 12px 20px;
            margin-top: 8px;
            border: none;
            border-radius: 10px;
            background: linear-gradient(135deg, #D8D3C4 0%, #c4bdab 100%);
            color: #2d3748;
            font-size: 14px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
        }

        .site-return-button:hover {
            background: linear-gradient(135deg, #c4bdab 0%, #b0a995 100%);
            transform: translateY(-1px);
            box-shadow: 0 4px 12px rgba(216, 211, 196, 0.3);
        }

        .icon {
            font-size: 18px;
            width: 20px;
            text-align: center;
        }

        .home-screen {
            text-align: center;
        }

        .home-content {
            padding: 30px 20px;
            display: flex;
            flex-direction: column;
            align-items: center;
        }

        .home-content h2 {
            margin-bottom: 15px;
            color: #2d3748;
            font-size: 20px;
            font-weight: 700;
            text-align: center;
            width: 100%;
        }

        .home-content p {
            color: #6b7280;
            font-size: 14px;
            line-height: 1.5;
            margin-bottom: 8px;
            text-align: center;
            width: 100%;
        }

        .login-button {
            background: linear-gradient(135deg, #4A8888 0%, #387070 100%);
            color: white;
            border: none;
            padding: 14px 35px;
            font-size: 15px;
            font-weight: 600;
            border-radius: 25px;
            cursor: pointer;
            transition: all 0.3s ease;
            box-shadow: 0 5px 15px rgba(74, 136, 136, 0.3);
            margin-top: 20px;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            position: relative;
            overflow: hidden;
            width: auto;
            min-width: 160px;
        }

        .login-button::before {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
            transition: left 0.5s;
        }

        .login-button:hover::before {
            left: 100%;
        }

        .login-button:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 25px rgba(74, 136, 136, 0.4);
            background: linear-gradient(135deg, #387070 0%, #2D5F5F 100%);
        }

        .site-button {
            background: linear-gradient(135deg, #D8D3C4 0%, #c4bdab 100%);
            color: #2d3748;
            border: none;
            padding: 12px 30px;
            font-size: 14px;
            font-weight: 600;
            border-radius: 20px;
            cursor: pointer;
            transition: all 0.3s ease;
            box-shadow: 0 3px 10px rgba(216, 211, 196, 0.3);
            margin-top: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            width: auto;
            min-width: 160px;
        }

        .site-button:hover {
            transform: translateY(-1px);
            box-shadow: 0 5px 15px rgba(216, 211, 196, 0.4);
            background: linear-gradient(135deg, #c4bdab 0%, #b0a995 100%);
        }

        .hidden {
            display: none;
        }

        .loading {
            display: inline-block;
            width: 16px;
            height: 16px;
            border: 2px solid #ffffff;
            border-radius: 50%;
            border-top-color: transparent;
            animation: spin 1s ease-in-out infinite;
        }

        @keyframes spin {
            to { transform: rotate(360deg); }
        }

        .footer {
            text-align: center;
            padding: 15px 20px;
            border-top: 1px solid #e5e7eb;
            color: #6b7280;
            font-size: 12px;
        }