* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Nunito', sans-serif;
        }

        body {
            background-color: #f7f9fc;
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 40px 20px;
        }

        .container {
            width: 100%;
            max-width: 600px;
            background: #ffffff;
            border-radius: 12px;
            box-shadow: 0 10px 40px rgba(0,0,0,0.05);
            padding: 40px 50px;
            position: relative;
            overflow: hidden;
        }
        
        .top-accent {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 6px;
            background: linear-gradient(90deg, #1890ff, #ffca28);
        }

        .header {
            text-align: center;
            margin-bottom: 30px;
        }
        
        .header h1 {
            font-size: 1.8rem;
            color: #1f2937;
            margin-bottom: 8px;
        }
        
        .header p {
            color: #6b7280;
            font-size: 0.95rem;
        }

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

        .form-label {
            display: block;
            font-size: 0.85rem;
            font-weight: 700;
            color: #374151;
            margin-bottom: 8px;
        }

        .form-control {
            width: 100%;
            padding: 12px 16px;
            border-radius: 8px;
            border: 1px solid #d1d5db;
            font-size: 14px;
            color: #111827;
            transition: all 0.2s;
        }
        
        .form-control:focus {
            outline: none;
            border-color: #1890ff;
            box-shadow: 0 0 0 3px rgba(24, 144, 255, 0.1);
        }

        /* Input Groups (for Shop URL and Mobile OTP) */
        .input-group {
            display: flex;
            align-items: center;
            border: 1px solid #d1d5db;
            border-radius: 8px;
            overflow: hidden;
            transition: all 0.2s;
        }
        
        .input-group:focus-within {
            border-color: #1890ff;
            box-shadow: 0 0 0 3px rgba(24, 144, 255, 0.1);
        }
        
        .input-group .form-control {
            border: none;
            box-shadow: none;
            border-radius: 0;
            padding-left: 4px;
        }
        
        .input-group-append {
            padding: 0 16px;
            background: #f3f4f6;
            color: #6b7280;
            font-weight: 600;
            font-size: 14px;
            display: flex;
            align-items: center;
            height: 100%;
            border-left: 1px solid #d1d5db;
        }
        
        .input-group-prepend {
            padding: 0 0 0 21px;
            background: transparent;
            color: #111827;
            font-weight: 600;
            font-size: 14px;
            display: flex;
            align-items: center;
            height: 100%;
            border-right: none;
        }

        .btn-send-otp {
            background: #1890ff;
            color: white;
            border: none;
            padding: 0 16px;
            height: 100%;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.2s;
        }
        .btn-send-otp:hover {
            background: #0050b3;
        }

        /* Validation Feedback Indicators */
        .feedback-icon {
            position: absolute;
            right: 12px;
            top: 36px;
            font-size: 14px;
            display: none;
        }
        .feedback-icon.loading {
            display: block;
            color: #1890ff;
            animation: spin 1s linear infinite;
        }
        .feedback-icon.success {
            display: block;
            color: #10b981;
        }
        .feedback-icon.error {
            display: block;
            color: #ef4444;
        }
        .feedback-text {
            font-size: 0.75rem;
            margin-top: 4px;
            display: none;
        }
        .feedback-text.error {
            display: block;
            color: #ef4444;
        }
        .feedback-text.success {
            display: block;
            color: #10b981;
        }

        @keyframes spin {
            100% { transform: rotate(360deg); }
        }

        /* OTP Section Animation */
        #otp-section {
            display: none;
            opacity: 0;
            transform: translateY(-10px);
            transition: all 0.3s ease;
        }
        #otp-section.visible {
            display: block;
            opacity: 1;
            transform: translateY(0);
        }

        .btn-primary {
            width: 100%;
            background-color: #1890ff;
            color: #ffffff;
            border: none;
            padding: 14px;
            border-radius: 8px;
            font-size: 15px;
            font-weight: 700;
            cursor: pointer;
            transition: all 0.3s;
            margin-top: 10px;
        }
        .btn-primary:hover {
            background-color: #0050b3;
            transform: translateY(-1px);
        }
        .btn-primary:disabled {
            background-color: #9ca3af;
            cursor: not-allowed;
            transform: none;
        }
        
        .footer-link {
            text-align: center;
            margin-top: 25px;
            font-size: 14px;
            color: #6b7280;
        }
        .footer-link a {
            color: #1890ff;
            text-decoration: none;
            font-weight: 700;
        }

    /* Mobile - Very Small Screens */
    @media (max-width: 480px) {
        body {
            font-size: 13px;
        }
        .content-area, .container {
            padding: 12px;
        }
        .header-nav {
            padding: 0 10px;
        }
        .header-right {
            gap: 8px;
        }
        .header-btn {
            padding: 6px;
        }
        .stat-card, .card {
            padding: 16px;
        }
        .split-data {
            grid-template-columns: 1fr;
        }
        .form-row {
            flex-direction: column;
        }
        /* Make inputs and buttons more touch friendly */
        input, select, .btn {
            font-size: 14px; /* prevents iOS zoom */
        }
        .btn-full-mobile {
            width: 100%;
            margin-top: 10px;
        }
        table {
            font-size: 12px;
        }
    }