:root {
        --primary: #00D4FF;
        --primary-dark: #00A8CC;
        --secondary: #6366F1;
        --accent: #10B981;
        --error: #EF4444;
        --warning: #F59E0B;
        --success: #10B981;
        
        /* Dark theme colors */
        --bg-primary: #0A0A0F;
        --bg-secondary: #1A1A2E;
        --bg-tertiary: #16213E;
        --text-primary: #FFFFFF;
        --text-secondary: #A1A1AA;
        --border-color: #374151;
        
        /* Glassmorphism */
        --glass-bg: rgba(255, 255, 255, 0.05);
        --glass-border: rgba(255, 255, 255, 0.1);
        --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
        
        /* Spacing */
        --space-xs: 0.25rem;
        --space-sm: 0.5rem;
        --space-md: 1rem;
        --space-lg: 1.5rem;
        --space-xl: 2rem;
        --space-2xl: 3rem;
        --space-3xl: 4rem;
        
        /* Border radius */
        --radius-sm: 0.375rem;
        --radius-md: 0.5rem;
        --radius-lg: 0.75rem;
        --radius-xl: 1rem;
        --radius-2xl: 1.5rem;
        --radius-full: 9999px;
        
        /* Typography */
        --font-size-xs: 0.75rem;
        --font-size-sm: 0.875rem;
        --font-size-base: 1rem;
        --font-size-lg: 1.125rem;
        --font-size-xl: 1.25rem;
        --font-size-2xl: 1.5rem;
        --font-size-3xl: 1.875rem;
        --font-size-4xl: 2.25rem;
        --font-size-5xl: 3rem;
        
        /* Shadows */
        --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
        --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
        --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
        --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
        --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
        --shadow-neon: 0 0 20px var(--primary), 0 0 40px var(--primary), 0 0 60px var(--primary);
    }

    /* Light theme variables */
    body.light-mode {
        --bg-primary: #F8FAFC;
        --bg-secondary: #F1F5F9;
        --bg-tertiary: #E2E8F0;
        --text-primary: #1E293B;
        --text-secondary: #64748B;
        --border-color: #CBD5E1;
        --glass-bg: rgba(255, 255, 255, 0.8);
        --glass-border: rgba(255, 255, 255, 0.2);
        --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    }

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

    html {
        scroll-behavior: smooth;
        font-size: 16px;
    }

    body {
        font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
        background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 50%, var(--bg-tertiary) 100%);
        background-attachment: fixed;
        color: var(--text-primary);
        min-height: 100vh;
        display: flex;
        justify-content: center;
        align-items: center;
        line-height: 1.6;
        -webkit-font-smoothing: antialiased;
        -moz-osx-font-smoothing: grayscale;
        overflow-x: hidden;
        padding: var(--space-lg);
    }

    .container {
        background: var(--glass-bg);
        backdrop-filter: blur(20px);
        border: 1px solid var(--glass-border);
        border-radius: var(--radius-2xl);
        padding: var(--space-3xl);
        width: 100%;
        max-width: 500px;
        box-shadow: var(--shadow-2xl);
        position: relative;
        animation: fadeIn 0.6s ease-out;
    }

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

    h1 {
        text-align: center;
        font-size: var(--font-size-3xl);
        font-weight: 800;
        background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
        background-clip: text;
        margin-bottom: var(--space-2xl);
        position: relative;
    }

    h1::after {
        content: '';
        position: absolute;
        bottom: -var(--space-md);
        left: 50%;
        transform: translateX(-50%);
        width: 80px;
        height: 4px;
        background: linear-gradient(90deg, var(--primary), var(--secondary));
        border-radius: var(--radius-full);
        animation: pulse 2s ease-in-out infinite alternate;
    }

    @keyframes pulse {
        from {
            transform: translateX(-50%) scaleX(1);
        }
        to {
            transform: translateX(-50%) scaleX(1.1);
        }
    }

    .form-group {
        margin-bottom: var(--space-xl);
        position: relative;
    }

    .input-field {
        width: 100%;
        padding: var(--space-lg);
        background: var(--glass-bg);
        backdrop-filter: blur(20px);
        border: 1px solid var(--glass-border);
        border-radius: var(--radius-lg);
        color: var(--text-primary);
        font-size: var(--font-size-base);
        outline: none;
        transition: all 0.3s ease;
    }

    .input-field:focus {
        border-color: var(--primary);
        box-shadow: 0 0 0 3px rgba(0, 212, 255, 0.1);
    }

    .input-field::placeholder {
        color: var(--text-secondary);
    }

    .input-field.error {
        border-color: var(--error);
        animation: shake 0.5s ease;
    }

    @keyframes shake {
        0%, 100% { transform: translateX(0); }
        10%, 30%, 50%, 70%, 90% { transform: translateX(-8px); }
        20%, 40%, 60%, 80% { transform: translateX(8px); }
    }

    .btn {
        width: 100%;
        padding: var(--space-lg);
        background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
        border: none;
        border-radius: var(--radius-lg);
        color: var(--bg-primary);
        font-weight: 700;
        cursor: pointer;
        font-size: var(--font-size-lg);
        box-shadow: var(--shadow-lg);
        transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        margin-bottom: var(--space-md);
        display: flex;
        align-items: center;
        justify-content: center;
        gap: var(--space-sm);
    }

    .btn:hover {
        background: linear-gradient(135deg, var(--secondary) 0%, var(--primary) 100%);
        transform: translateY(-2px);
        box-shadow: var(--shadow-xl);
    }

    .btn:active {
        transform: translateY(0);
        box-shadow: var(--shadow-lg);
    }

    .btn:disabled {
        background: var(--text-secondary);
        cursor: not-allowed;
        transform: none !important;
    }

    .toggle-section {
        display: flex;
        gap: var(--space-md);
        margin-bottom: var(--space-xl);
    }

    .toggle-btn {
        flex: 1;
        padding: var(--space-md);
        background: var(--glass-bg);
        backdrop-filter: blur(20px);
        border: 1px solid var(--glass-border);
        color: var(--text-primary);
        border-radius: var(--radius-lg);
        cursor: pointer;
        transition: all 0.3s ease;
        font-size: var(--font-size-base);
        text-align: center;
        display: flex;
        align-items: center;
        justify-content: center;
        gap: var(--space-sm);
    }

    .toggle-btn.active {
        background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
        color: var(--bg-primary);
        border-color: transparent;
        box-shadow: var(--shadow-md);
    }

    .toggle-btn:hover:not(.active) {
        background: rgba(255, 255, 255, 0.1);
        border-color: var(--primary);
    }

    .additional-actions {
        text-align: center;
        margin-top: var(--space-xl);
    }

    .link-btn {
        background: none;
        border: none;
        color: var(--primary);
        cursor: pointer;
        text-decoration: none;
        font-size: var(--font-size-base);
        transition: all 0.3s ease;
        font-weight: 500;
        display: inline-flex;
        align-items: center;
        gap: var(--space-sm);
    }

    .link-btn:hover {
        color: var(--primary-dark);
        text-decoration: underline;
    }

    .message {
        margin-top: var(--space-lg);
        padding: var(--space-md);
        border-radius: var(--radius-lg);
        text-align: center;
        font-weight: 600;
        display: none;
        animation: fadeIn 0.3s ease;
    }

    .message.success {
        background-color: rgba(16, 185, 129, 0.1);
        color: var(--success);
        border: 1px solid var(--success);
    }

    .message.error {
        background-color: rgba(239, 68, 68, 0.1);
        color: var(--error);
        border: 1px solid var(--error);
    }

    .message.info {
        background-color: rgba(0, 212, 255, 0.1);
        color: var(--primary);
        border: 1px solid var(--primary);
    }

    .theme-toggle {
        position: fixed;
        top: var(--space-lg);
        right: var(--space-lg);
        width: 48px;
        height: 48px;
        background: var(--glass-bg);
        backdrop-filter: blur(20px);
        border: 1px solid var(--glass-border);
        border-radius: var(--radius-full);
        display: flex;
        align-items: center;
        justify-content: center;
        cursor: pointer;
        transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        color: var(--primary);
        font-size: var(--font-size-lg);
        z-index: 100;
    }

    .theme-toggle:hover {
        transform: scale(1.1) rotate(180deg);
        box-shadow: var(--shadow-lg);
        background: var(--primary);
        color: var(--bg-primary);
    }

    .close-btn {
        position: fixed;
        top: var(--space-lg);
        left: var(--space-lg);
        width: 48px;
        height: 48px;
        background: var(--glass-bg);
        backdrop-filter: blur(20px);
        border: 1px solid var(--glass-border);
        border-radius: var(--radius-full);
        display: flex;
        align-items: center;
        justify-content: center;
        cursor: pointer;
        transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        color: var(--text-secondary);
        font-size: var(--font-size-lg);
        z-index: 100;
        text-decoration: none;
    }

    .close-btn:hover {
        transform: scale(1.1);
        box-shadow: var(--shadow-lg);
        background: var(--error);
        color: white;
        border-color: var(--error);
    }

    .toggle-password {
        position: absolute;
        top: 50%;
        right: var(--space-md);
        transform: translateY(-50%);
        background: none;
        border: none;
        cursor: pointer;
        color: var(--primary);
        font-size: var(--font-size-lg);
        transition: all 0.3s ease;
        padding: var(--space-xs);
        border-radius: var(--radius-sm);
    }

    .toggle-password:hover {
        color: var(--primary-dark);
        background: rgba(0, 212, 255, 0.1);
    }

    .loading-spinner {
        width: 20px;
        height: 20px;
        border: 2px solid transparent;
        border-top: 2px solid var(--bg-primary);
        border-radius: 50%;
        animation: spin 1s linear infinite;
        display: none;
    }

    @keyframes spin {
        0% {
            transform: rotate(0deg);
        }
        100% {
            transform: rotate(360deg);
        }
    }

    /* Cookie Banner Styles */
    .cookie-banner {
        position: fixed;
        bottom: var(--space-lg);
        left: 50%;
        transform: translateX(-50%);
        max-width: 600px;
        width: calc(100% - var(--space-xl));
        background: var(--glass-bg);
        backdrop-filter: blur(20px);
        border: 1px solid var(--glass-border);
        border-radius: var(--radius-2xl);
        padding: var(--space-xl);
        text-align: center;
        box-shadow: var(--shadow-2xl);
        z-index: 200;
        display: none;
    }

    .cookie-banner p {
        margin-bottom: var(--space-lg);
        color: var(--text-primary);
        line-height: 1.6;
    }

    .cookie-btn {
        background: var(--primary);
        color: var(--bg-primary);
        border: none;
        padding: var(--space-md) var(--space-xl);
        border-radius: var(--radius-full);
        cursor: pointer;
        transition: all 0.3s ease;
        font-weight: 600;
        margin: 0 var(--space-sm);
        font-size: var(--font-size-base);
    }

    .cookie-btn.reject {
        background: var(--error);
        color: white;
    }

    .cookie-btn:hover {
        transform: translateY(-2px);
        box-shadow: var(--shadow-lg);
    }

    .cookie-confirmation {
        position: fixed;
        bottom: var(--space-lg);
        left: 50%;
        transform: translateX(-50%);
        background: var(--glass-bg);
        backdrop-filter: blur(20px);
        border: 1px solid var(--glass-border);
        border-radius: var(--radius-full);
        padding: var(--space-md) var(--space-xl);
        color: var(--text-primary);
        box-shadow: var(--shadow-lg);
        z-index: 200;
        display: none;
        opacity: 0;
        transition: opacity 0.5s ease;
    }

    .cookie-confirmation.success {
        border-color: var(--success);
    }

    .cookie-confirmation.error {
        border-color: var(--error);
    }

    @media (max-width: 768px) {
        .container {
            padding: var(--space-2xl);
            margin: var(--space-md);
        }
        
        h1 {
            font-size: var(--font-size-2xl);
        }
        
        .theme-toggle,
        .close-btn {
            width: 40px;
            height: 40px;
            font-size: var(--font-size-base);
        }
        
        .toggle-section {
            flex-direction: column;
        }
        
        .cookie-banner {
            padding: var(--space-lg);
            bottom: var(--space-md);
        }
        
        .cookie-btn {
            padding: var(--space-sm) var(--space-md);
            font-size: var(--font-size-sm);
        }
    }

    @media (max-width: 480px) {
        .container {
            padding: var(--space-xl);
        }
        
        .cookie-banner {
            width: calc(100% - var(--space-md));
            padding: var(--space-lg);
        }
        
        .cookie-banner p {
            font-size: var(--font-size-sm);
        }
    }

    @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;
        }
    }

    *:focus {
        outline: 2px solid var(--primary);
        outline-offset: 2px;
    }