:root {
            --background-color: #ffffff;
            --default-color: #444444;
            --heading-color: #273d4e;
            --accent-color: #ff4a17;
            --surface-color: #ffffff;
            --contrast-color: #ffffff;
            --nav-color: #e5eaee;
            --nav-hover-color: #ff4a17;
        }

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

        .body {
            font-family: "Roboto", system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", "Liberation Sans", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";
            background: linear-gradient(135deg, var(--heading-color) 0%, var(--accent-color) 100%);
            color: var(--default-color);
            line-height: 1.6;
            letter-spacing: 0.01em;
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 20px;
        }

        .auth-container {
            background: var(--surface-color);
            border-radius: 8px;
            box-shadow: 0 8px 32px rgba(39, 61, 78, 0.15);
            overflow: hidden;
            width: 100%;
            max-width: 450px;
            position: relative;
            animation: slideUp 0.5s ease-out;
        }

        @keyframes slideUp {
            from {
                opacity: 0;
                transform: translateY(30px);
            }

            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        .auth-header {
            background: var(--heading-color);
            color: var(--contrast-color);
            padding: 32px;
            text-align: center;
            position: relative;
        }

        .logo {
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 16px;
        }

        .logo-icon {
            width: 40px;
            height: 40px;
            background: var(--accent-color);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-right: 12px;
            font-weight: 700;
            color: var(--contrast-color);
            font-size: 18px;
        }

        .logo-text {
            font-family: "Raleway", sans-serif;
            font-weight: 700;
            font-size: 18px;
            text-transform: uppercase;
        }

        .auth-title {
            font-family: "Raleway", sans-serif;
            font-weight: 600;
            font-size: 24px;
            margin-bottom: 8px;
        }

        .auth-subtitle {
            font-size: 14px;
            opacity: 0.9;
        }

        .auth-form {
            padding: 32px;
        }

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

        .form-label {
            display: block;
            font-size: 14px;
            font-weight: 600;
            color: var(--heading-color);
            margin-bottom: 8px;
            letter-spacing: 0.01em;
        }

        .form-input {
            width: 100%;
            padding: 14px 16px;
            border: 1px solid var(--nav-color);
            border-radius: 4px;
            font-size: 16px;
            font-family: "Roboto", system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", "Liberation Sans", sans-serif;
            color: var(--default-color);
            background: var(--background-color);
            transition: border-color 0.3s ease, box-shadow 0.3s ease;
        }

        .form-input:focus {
            outline: none;
            border-color: var(--accent-color);
            box-shadow: 0 0 0 2px rgba(255, 74, 23, 0.2);
        }

        .form-input::placeholder {
            color: #999999;
        }

        .password-field {
            position: relative;
        }

        .password-toggle {
            position: absolute;
            right: 12px;
            top: 50%;
            transform: translateY(-50%);
            background: none;
            border: none;
            color: #666666;
            cursor: pointer;
            font-size: 14px;
            padding: 4px;
        }

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

        .form-checkbox {
            display: flex;
            align-items: center;
            margin-bottom: 24px;
        }

        .checkbox-input {
            width: 18px;
            height: 18px;
            margin-right: 12px;
            accent-color: var(--accent-color);
        }

        .checkbox-label {
            font-size: 14px;
            color: var(--default-color);
            cursor: pointer;
        }

        .auth-button {
            width: 100%;
            padding: 14px 20px;
            background: var(--accent-color);
            color: var(--contrast-color);
            border: none;
            border-radius: 6px;
            font-family: "Raleway", sans-serif;
            font-weight: 700;
            font-size: 16px;
            letter-spacing: 0.05em;
            cursor: pointer;
            transition: all 0.3s ease;
            margin-bottom: 20px;
        }

        .auth-button:hover {
            background: #e63d14;
            box-shadow: 0 4px 12px rgba(255, 74, 23, 0.3);
            transform: translateY(-1px);
        }

        .auth-button:active {
            transform: translateY(0);
        }

        .auth-button:disabled {
            background: #CCCCCC;
            cursor: not-allowed;
            transform: none;
            box-shadow: none;
        }

        .auth-divider {
            display: flex;
            align-items: center;
            margin: 24px 0;
            color: #666666;
            font-size: 14px;
        }

        .auth-divider::before,
        .auth-divider::after {
            content: '';
            flex: 1;
            height: 1px;
            background: var(--nav-color);
        }

        .auth-divider span {
            padding: 0 16px;
        }

        .social-buttons {
            display: flex;
            gap: 12px;
            margin-bottom: 24px;
        }

        .social-button {
            flex: 1;
            padding: 12px;
            border: 1px solid var(--nav-color);
            border-radius: 6px;
            background: var(--background-color);
            color: var(--default-color);
            font-size: 14px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
        }

        .social-button:hover {
            background: #F5F5F5;
            border-color: var(--accent-color);
            transform: translateY(-1px);
        }

        .auth-links {
            text-align: center;
        }

        .auth-link {
            color: var(--accent-color);
            text-decoration: none;
            font-size: 14px;
            font-weight: 600;
            cursor: pointer;
            transition: color 0.3s ease;
        }

        .auth-link:hover {
            color: var(--heading-color);
            text-decoration: underline;
        }

        .auth-footer {
            padding: 20px 32px;
            background: #f1f4fa;
            text-align: center;
            font-size: 14px;
            color: #666666;
        }

        .error-message {
            background: #FFE8E8;
            color: #D32F2F;
            padding: 12px 16px;
            border-radius: 4px;
            margin-bottom: 20px;
            font-size: 14px;
            border-left: 4px solid #D32F2F;
            animation: shake 0.5s ease-in-out;
        }

        .success-message {
            background: #E8F5E8;
            color: var(--heading-color);
            padding: 12px 16px;
            border-radius: 4px;
            margin-bottom: 20px;
            font-size: 14px;
            border-left: 4px solid var(--accent-color);
        }

        @keyframes shake {

            0%,
            100% {
                transform: translateX(0);
            }

            25% {
                transform: translateX(-5px);
            }

            75% {
                transform: translateX(5px);
            }
        }

        .loading {
            display: inline-block;
            width: 20px;
            height: 20px;
            border: 2px solid var(--contrast-color);
            border-radius: 50%;
            border-top-color: transparent;
            animation: spin 1s ease-in-out infinite;
        }

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

        .form-input.invalid {
            border-color: #D32F2F;
            box-shadow: 0 0 0 2px rgba(211, 47, 47, 0.2);
        }

        .form-input.valid {
            border-color: var(--accent-color);
        }

        .field-error {
            color: #D32F2F;
            font-size: 12px;
            margin-top: 4px;
        }

        .password-strength {
            margin-top: 8px;
        }

        .strength-bar {
            height: 4px;
            background: var(--nav-color);
            border-radius: 2px;
            overflow: hidden;
            margin-bottom: 4px;
        }

        .strength-fill {
            height: 100%;
            transition: all 0.3s ease;
            border-radius: 2px;
        }

        .strength-weak .strength-fill {
            width: 33%;
            background: #D32F2F;
        }

        .strength-medium .strength-fill {
            width: 66%;
            background: #F7931E;
        }

        .strength-strong .strength-fill {
            width: 100%;
            background: var(--accent-color);
        }

        .strength-text {
            font-size: 12px;
            color: #666666;
        }

        .back-button {
            position: absolute;
            left: 20px;
            top: 50%;
            transform: translateY(-50%);
            background: none;
            border: none;
            color: var(--contrast-color);
            cursor: pointer;
            font-size: 20px;
            opacity: 0.8;
            transition: opacity 0.3s ease;
        }

        .back-button:hover {
            opacity: 1;
        }

        .verification-code {
            display: flex;
            gap: 8px;
            justify-content: center;
            margin: 20px 0;
        }

        .code-input {
            width: 50px;
            height: 50px;
            text-align: center;
            border: 2px solid var(--nav-color);
            border-radius: 8px;
            font-size: 20px;
            font-weight: 600;
            color: var(--default-color);
            transition: border-color 0.3s ease;
        }

        .code-input:focus {
            outline: none;
            border-color: var(--accent-color);
        }

        .resend-timer {
            text-align: center;
            margin-top: 16px;
            color: #666666;
            font-size: 14px;
        }

        .resend-link {
            color: var(--accent-color);
            cursor: pointer;
            text-decoration: underline;
        }

        .resend-link:hover {
            color: var(--heading-color);
        }

        @media (max-width: 480px) {
            .auth-container {
                margin: 10px;
            }

            .auth-header,
            .auth-form {
                padding: 24px;
            }

            .social-buttons {
                flex-direction: column;
            }

            .verification-code {
                gap: 6px;
            }

            .code-input {
                width: 45px;
                height: 45px;
                font-size: 18px;
            }
        }

        .auth-page {
            display: none;
        }

        .auth-page.active {
            display: block;
        }