:root {
            --bg-base: #02040a;
            --bg-card: rgba(13, 17, 23, 0.7);
            --cyan-primary: #00e5ff;
            --cyan-dim: rgba(0, 229, 255, 0.1);
            --text-main: #f0f6fc;
            --text-muted: #8b949e;
            --border-glass: rgba(255, 255, 255, 0.08);
            --danger: #ff5f56;
            --font-ui: 'Inter', system-ui, sans-serif;
        }

        * { box-sizing: border-box; margin: 0; padding: 0; }
        
        body { 
            background-color: var(--bg-base); 
            color: var(--text-main); 
            font-family: var(--font-ui); 
            display: flex; 
            justify-content: center; 
            align-items: center; 
            min-height: 100vh;
            background-image: 
                radial-gradient(circle at top right, rgba(0, 229, 255, 0.05) 0%, transparent 40%),
                radial-gradient(circle at bottom left, rgba(30, 60, 150, 0.1) 0%, transparent 40%);
        }

        .auth-container {
            width: 100%;
            max-width: 400px;
            background: var(--bg-card);
            border: 1px solid var(--border-glass);
            border-radius: 16px;
            padding: 40px 32px;
            backdrop-filter: blur(20px);
            box-shadow: 0 20px 40px rgba(0,0,0,0.5);
            position: relative;
            overflow: hidden;
        }

        .logo {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 12px;
            font-weight: 600;
            font-size: 20px;
            margin-bottom: 32px;
        }

        .logo svg {
            width: 28px;
            height: 28px;
            stroke: var(--cyan-primary);
            filter: drop-shadow(0 0 8px rgba(0, 229, 255, 0.4));
        }

        .form-group { margin-bottom: 20px; }
        
        .form-group label {
            display: block;
            font-size: 13px;
            color: var(--text-muted);
            margin-bottom: 8px;
        }

        .form-control {
            width: 100%;
            padding: 12px 16px;
            background: rgba(0, 0, 0, 0.4);
            border: 1px solid var(--border-glass);
            border-radius: 8px;
            color: var(--text-main);
            font-family: var(--font-ui);
            font-size: 14px;
            transition: all 0.3s;
        }

        .form-control:focus {
            outline: none;
            border-color: var(--cyan-primary);
            box-shadow: 0 0 0 1px var(--cyan-primary);
        }

        .btn {
            width: 100%;
            padding: 12px;
            border-radius: 8px;
            font-size: 14px;
            font-weight: 600;
            cursor: pointer;
            border: none;
            transition: all 0.3s;
            display: flex;
            justify-content: center;
            align-items: center;
            gap: 8px;
        }

        .btn-primary {
            background: var(--cyan-dim);
            color: var(--cyan-primary);
            border: 1px solid var(--cyan-primary);
        }

        .btn-primary:hover:not(:disabled) {
            background: var(--cyan-primary);
            color: var(--bg-base);
            box-shadow: 0 0 15px rgba(0, 229, 255, 0.3);
        }

        .btn:disabled {
            opacity: 0.7;
            cursor: not-allowed;
        }

        .switch-form {
            text-align: center;
            margin-top: 24px;
            font-size: 13px;
            color: var(--text-muted);
        }

        .switch-form a {
            color: var(--cyan-primary);
            text-decoration: none;
            margin-left: 4px;
        }

        .switch-form a:hover { text-decoration: underline; }

        .alert {
            padding: 12px;
            border-radius: 8px;
            font-size: 13px;
            margin-top: 20px;
            display: none;
            text-align: center;
        }

        .alert.error {
            background: rgba(255, 95, 86, 0.1);
            border: 1px solid var(--danger);
            color: var(--danger);
            display: block;
        }

        /* Анимация переключения форм */
        .form-view { display: none; animation: fadeIn 0.4s ease; }
        .form-view.active { display: block; }

        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(10px); }
            to { opacity: 1; transform: translateY(0); }
        }

        /* Спиннер загрузки */
        .spinner {
            width: 16px;
            height: 16px;
            border: 2px solid transparent;
            border-top-color: currentColor;
            border-right-color: currentColor;
            border-radius: 50%;
            animation: spin 0.8s linear infinite;
        }

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