:root {
            --primary: #10b981;
            --primary-dark: #059669;
            --primary-light: #d1fae5;
            --accent-teal: #14b8a6;
            --accent-blue: #3b82f6;
            --success: #10b981;
            --danger: #ef4444;
            --warning: #f59e0b;
            --info: #3b82f6;
            --dark: #0f172a;
            --dark-gray: #1e293b;
            --gray: #64748b;
            --light-gray: #94a3b8;
            --lighter-gray: #cbd5e1;
            --lightest-gray: #e2e8f0;
            --bg-light: #f8fafc;
            --white: #ffffff;
            --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.06);
            --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
            --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
            --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.1);
            --shadow-2xl: 0 25px 50px rgba(0, 0, 0, 0.15);
            --transition-fast: 0.15s ease;
            --transition: 0.3s ease;
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 16px;
            --radius-xl: 20px;
            --radius-full: 9999px;
        }

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

        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Segoe UI', 'Roboto', 'Helvetica Neue', sans-serif;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: var(--dark);
            line-height: 1.6;
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 20px;
            position: relative;
            overflow: hidden;
        }

        .bg-decoration {
            position: fixed;
            border-radius: var(--radius-full);
            opacity: 0.1;
            pointer-events: none;
            z-index: 0;
        }

        .decoration-1 {
            width: 400px;
            height: 400px;
            background: var(--primary);
            top: -100px;
            left: -100px;
            animation: float 20s ease-in-out infinite;
        }

        .decoration-2 {
            width: 300px;
            height: 300px;
            background: var(--accent-blue);
            bottom: -80px;
            right: -80px;
            animation: float 15s ease-in-out infinite reverse;
        }

        .decoration-3 {
            width: 200px;
            height: 200px;
            background: var(--accent-teal);
            top: 50%;
            right: 10%;
            animation: float 18s ease-in-out infinite;
        }

        @keyframes float {
            0%, 100% {
                transform: translate(0, 0) scale(1);
            }
            33% {
                transform: translate(30px, -50px) scale(1.1);
            }
            66% {
                transform: translate(-20px, 20px) scale(0.9);
            }
        }

        .login-container {
            width: 100%;
            max-width: 440px;
            position: relative;
            z-index: 1;
            animation: slideUp 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
        }

        @keyframes slideUp {
            from {
                opacity: 0;
                transform: translateY(30px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        .login-card {
            background: var(--white);
            border-radius: var(--radius-xl);
            padding: 48px 40px;
            box-shadow: var(--shadow-2xl);
            backdrop-filter: blur(10px);
            border: 1px solid rgba(255, 255, 255, 0.2);
            animation: fadeIn 0.6s ease-out 0.2s both;
        }

        @keyframes fadeIn {
            from {
                opacity: 0;
            }
            to {
                opacity: 1;
            }
        }

        .logo-section {
            text-align: center;
            margin-bottom: 40px;
            animation: slideInFromTop 0.6s ease-out;
        }

        @keyframes slideInFromTop {
            from {
                opacity: 0;
                transform: translateY(-20px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        .logo-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 80px;
            height: 80px;
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            border-radius: var(--radius-lg);
            margin-bottom: 20px;
            box-shadow: 0 8px 20px rgba(16, 185, 129, 0.3);
            animation: pulse 2s ease-in-out infinite;
        }

        @keyframes pulse {
            0%, 100% {
                transform: scale(1);
                box-shadow: 0 8px 20px rgba(16, 185, 129, 0.3);
            }
            50% {
                transform: scale(1.05);
                box-shadow: 0 12px 28px rgba(16, 185, 129, 0.4);
            }
        }

        .logo-section h1 {
            font-size: 28px;
            font-weight: 800;
            color: var(--dark);
            margin-bottom: 8px;
            letter-spacing: -0.5px;
        }

        .subtitle {
            font-size: 16px;
            color: var(--gray);
            font-weight: 600;
        }

        .auth-form {
            display: block;
        }

        .form-group {
            margin-bottom: 24px;
        }

        .form-group label {
            display: block;
            font-size: 13px;
            font-weight: 700;
            color: var(--dark);
            margin-bottom: 8px;
            text-transform: uppercase;
            letter-spacing: 0.5px;
        }

        .form-group input {
            width: 100%;
            padding: 14px 16px;
            border: 2px solid var(--lightest-gray);
            border-radius: var(--radius-sm);
            font-size: 15px;
            transition: all var(--transition);
            background: var(--white);
            color: var(--dark);
            font-family: inherit;
        }

        .form-group input::placeholder {
            color: var(--light-gray);
        }

        .form-group input:hover {
            border-color: var(--lighter-gray);
        }

        .form-group input:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 4px var(--primary-light);
        }

        .password-input-wrapper {
            position: relative;
        }

        .password-input-wrapper input {
            padding-right: 48px;
        }

        .toggle-password {
            position: absolute;
            right: 12px;
            top: 50%;
            transform: translateY(-50%);
            background: none;
            border: none;
            padding: 6px;
            cursor: pointer;
            color: var(--gray);
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: var(--radius-sm);
            transition: var(--transition);
        }

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

        .checkbox-group {
            margin-bottom: 28px;
        }

        .checkbox-group label {
            display: flex;
            align-items: center;
            gap: 10px;
            cursor: pointer;
            font-size: 14px;
            font-weight: 600;
            color: var(--gray);
            text-transform: none;
            letter-spacing: normal;
        }

        .checkbox-group input[type="checkbox"] {
            width: 20px;
            height: 20px;
            cursor: pointer;
            accent-color: var(--primary);
        }

        .checkbox-group input[type="checkbox"]:focus {
            outline: 2px solid var(--primary);
            outline-offset: 2px;
        }

        .error-message {
            background: #fee2e2;
            color: var(--danger);
            padding: 14px 16px;
            border-radius: var(--radius-sm);
            font-size: 14px;
            margin-bottom: 20px;
            border-left: 4px solid var(--danger);
            font-weight: 600;
            display: flex;
            align-items: center;
            gap: 10px;
            animation: shake 0.5s;
        }

        .error-message::before {
            content: '⚠';
            font-size: 18px;
            flex-shrink: 0;
        }

        .success-message {
            background: var(--primary-light);
            color: var(--primary-dark);
            padding: 14px 16px;
            border-radius: var(--radius-sm);
            font-size: 14px;
            margin-bottom: 20px;
            border-left: 4px solid var(--primary);
            font-weight: 600;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .success-message::before {
            content: '✓';
            font-size: 18px;
            flex-shrink: 0;
        }

        @keyframes shake {
            0%, 100% { transform: translateX(0); }
            10%, 30%, 50%, 70%, 90% { transform: translateX(-5px); }
            20%, 40%, 60%, 80% { transform: translateX(5px); }
        }

        .btn-primary {
            width: 100%;
            padding: 16px;
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            color: white;
            border: none;
            border-radius: var(--radius-sm);
            font-size: 15px;
            font-weight: 700;
            cursor: pointer;
            transition: all var(--transition);
            text-transform: uppercase;
            letter-spacing: 0.5px;
            box-shadow: 0 4px 12px rgba(16, 185, 129, 0.3);
            position: relative;
            overflow: hidden;
        }

        .btn-primary::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;
        }

        .btn-primary:hover:not(:disabled)::before {
            left: 100%;
        }

        .btn-primary:hover:not(:disabled) {
            transform: translateY(-2px);
            box-shadow: 0 8px 20px rgba(16, 185, 129, 0.4);
        }

        .btn-primary:active:not(:disabled) {
            transform: translateY(0);
        }

        .btn-primary:disabled {
            opacity: 0.7;
            cursor: not-allowed;
            transform: none !important;
        }

        .btn-primary.shake {
            animation: shake 0.5s;
        }

        .btn-loader {
            display: inline-flex;
            align-items: center;
            justify-content: center;
        }

        .spinner {
            animation: spin 1s linear infinite;
            stroke-dasharray: 60;
            stroke-dashoffset: 0;
            transform-origin: center;
        }

        @keyframes spin {
            0% {
                transform: rotate(0deg);
                stroke-dashoffset: 0;
            }
            50% {
                stroke-dashoffset: 30;
            }
            100% {
                transform: rotate(360deg);
                stroke-dashoffset: 0;
            }
        }

        .login-footer {
            margin-top: 32px;
            padding-top: 24px;
            border-top: 1px solid var(--lightest-gray);
            text-align: center;
            display: flex;
            flex-direction: column;
            gap: 12px;
            animation: slideInFromBottom 0.6s ease-out 0.3s both;
        }

        @keyframes slideInFromBottom {
            from {
                opacity: 0;
                transform: translateY(20px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        .login-footer p {
            font-size: 14px;
            color: var(--gray);
            margin: 0;
        }

        .link-secondary {
            color: var(--primary);
            text-decoration: none;
            font-weight: 600;
            transition: var(--transition);
            position: relative;
        }

        .link-secondary::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--primary);
            transition: width var(--transition);
        }

        .link-secondary:hover::after {
            width: 100%;
        }

        .link-secondary:hover {
            color: var(--primary-dark);
        }

        .security-notice {
            margin-top: 24px;
            padding: 16px;
            background: rgba(255, 255, 255, 0.9);
            border-radius: var(--radius-md);
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
            font-size: 13px;
            color: var(--gray);
            font-weight: 600;
            box-shadow: var(--shadow-sm);
            backdrop-filter: blur(10px);
            animation: fadeIn 0.8s ease-out 0.4s both;
        }

        .security-notice svg {
            flex-shrink: 0;
        }

        /* Responsive Design */
        @media (max-width: 480px) {
            body {
                padding: 16px;
            }

            .login-card {
                padding: 32px 24px;
            }

            .logo-section {
                margin-bottom: 32px;
            }

            .logo-icon {
                width: 70px;
                height: 70px;
                margin-bottom: 16px;
            }

            .logo-section h1 {
                font-size: 24px;
            }

            .subtitle {
                font-size: 14px;
            }

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

            .form-group input {
                padding: 12px 14px;
                font-size: 14px;
            }

            .btn-primary {
                padding: 14px;
                font-size: 14px;
            }

            .login-footer {
                margin-top: 24px;
                padding-top: 20px;
                font-size: 13px;
            }

            .security-notice {
                margin-top: 20px;
                padding: 14px;
                font-size: 12px;
                flex-direction: column;
                text-align: center;
            }

            .bg-decoration {
                display: none;
            }
        }

        @media (max-width: 360px) {
            .login-card {
                padding: 28px 20px;
            }

            .logo-section h1 {
                font-size: 22px;
            }

            .form-group label {
                font-size: 12px;
            }
        }

        @media (min-width: 768px) {
            .login-container {
                max-width: 480px;
            }

            .login-card {
                padding: 56px 48px;
            }

            .logo-section {
                margin-bottom: 48px;
            }

            .logo-icon {
                width: 90px;
                height: 90px;
            }

            .logo-section h1 {
                font-size: 32px;
            }

            .subtitle {
                font-size: 18px;
            }

            .form-group input {
                padding: 16px 18px;
                font-size: 16px;
            }

            .btn-primary {
                padding: 18px;
                font-size: 16px;
            }
        }

        @media (hover: hover) {
            .login-card {
                transition: transform var(--transition), box-shadow var(--transition);
            }

            .login-card:hover {
                transform: translateY(-4px);
                box-shadow: 0 30px 60px rgba(0, 0, 0, 0.2);
            }
        }

        @media (max-height: 600px) and (orientation: landscape) {
            .login-card {
                padding: 24px 32px;
                max-height: 90vh;
                overflow-y: auto;
            }

            .logo-section {
                margin-bottom: 20px;
            }

            .logo-icon {
                width: 60px;
                height: 60px;
                margin-bottom: 12px;
            }

            .logo-section h1 {
                font-size: 22px;
            }

            .subtitle {
                font-size: 14px;
            }

            .form-group {
                margin-bottom: 16px;
            }

            .login-footer {
                margin-top: 20px;
                padding-top: 16px;
            }

            .security-notice {
                margin-top: 16px;
                padding: 12px;
                font-size: 12px;
            }
        }

        @media (pointer: coarse) {
            .form-group input,
            .btn-primary {
                min-height: 48px;
            }

            .toggle-password {
                min-width: 44px;
                min-height: 44px;
            }

            .checkbox-group input[type="checkbox"] {
                width: 24px;
                height: 24px;
            }

            .link-secondary {
                padding: 8px;
                margin: -8px;
            }
        }

        button:focus-visible,
        a:focus-visible,
        input:focus-visible {
            outline: 2px solid var(--primary);
            outline-offset: 2px;
        }

        @media (prefers-reduced-motion: reduce) {
            *,
            *::before,
            *::after {
                animation-duration: 0.01ms !important;
                animation-iteration-count: 1 !important;
                transition-duration: 0.01ms !important;
                scroll-behavior: auto !important;
            }

            .bg-decoration {
                animation: none;
            }

            .logo-icon {
                animation: none;
            }

            .btn-primary::before {
                transition: none;
            }
        }

        @media (prefers-color-scheme: dark) {
            body {
                background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
            }

            .login-card {
                background: var(--dark-gray);
                border-color: rgba(255, 255, 255, 0.1);
            }

            .logo-section h1 {
                color: var(--white);
            }

            .subtitle {
                color: var(--light-gray);
            }

            .form-group label {
                color: var(--lightest-gray);
            }

            .form-group input {
                background: var(--dark);
                border-color: #334155;
                color: var(--white);
            }

            .form-group input:hover {
                border-color: #475569;
            }

            .form-group input:focus {
                background: var(--dark);
            }

            .form-group input::placeholder {
                color: var(--gray);
            }

            .toggle-password {
                color: var(--light-gray);
            }

            .toggle-password:hover {
                background: #334155;
                color: var(--primary);
            }

            .checkbox-group label {
                color: var(--light-gray);
            }

            .login-footer {
                border-top-color: #334155;
            }

            .login-footer p {
                color: var(--light-gray);
            }

            .security-notice {
                background: rgba(30, 41, 59, 0.9);
                color: var(--light-gray);
            }

            .bg-decoration {
                opacity: 0.05;
            }
        }

        input:-webkit-autofill,
        input:-webkit-autofill:hover,
        input:-webkit-autofill:focus {
            -webkit-box-shadow: 0 0 0 30px var(--white) inset !important;
            -webkit-text-fill-color: var(--dark) !important;
            transition: background-color 5000s ease-in-out 0s;
        }

        @media (prefers-color-scheme: dark) {
            input:-webkit-autofill,
            input:-webkit-autofill:hover,
            input:-webkit-autofill:focus {
                -webkit-box-shadow: 0 0 0 30px var(--dark) inset !important;
                -webkit-text-fill-color: var(--white) !important;
            }
        }

        .login-container,
        .login-card,
        .logo-icon,
        .btn-primary,
        .bg-decoration {
            transform: translateZ(0);
            backface-visibility: hidden;
        }

        button,
        .link-secondary {
            -webkit-user-select: none;
            user-select: none;
        }

        button,
        a,
        input {
            -webkit-tap-highlight-color: transparent;
        }

        body {
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            text-rendering: optimizeLegibility;
        }