:root {
            --bg-color: #ffffff;
            --text-main: #000000;
            --text-muted: #666666;
            --border-color: #eaeaea;
            --input-bg: #fafafa;
            --ring-color: #000000;
            --toast-success: #10b981;
            --toast-error: #ef4444;
        }

        .dark {
            --bg-color: #000000;
            --text-main: #ffffff;
            --text-muted: #888888;
            --border-color: #333333;
            --input-bg: #0a0a0a;
            --ring-color: #ffffff;
            --toast-success: #059669;
            --toast-error: #dc2626;
        }

        body {
            font-family: 'Inter', sans-serif;
            background-color: var(--bg-color);
            color: var(--text-main);
            transition: background-color 0.3s ease, color 0.3s ease;
            -webkit-font-smoothing: antialiased;
        }
        .anton-font { 
            font-family: 'Anton', sans-serif; 
            text-transform: uppercase;
            letter-spacing: 0.01em;
        }

        .container-slim {
            width: 100%;
            max-width: 640px;
            margin: 0 auto;
            padding: 0 1.5rem;
        }

        .vercel-textarea {
            background-color: var(--input-bg);
            border: 1px solid var(--border-color);
            border-radius: 12px;
            transition: all 0.2s ease;
        }

        .vercel-textarea:focus {
            outline: none;
            border-color: var(--ring-color);
            box-shadow: 0 0 0 1px var(--ring-color);
            background-color: var(--bg-color);
        }

        .vercel-btn {
            background-color: var(--text-main);
            color: var(--bg-color);
            border: 1px solid var(--text-main);
            border-radius: 8px;
            transition: all 0.2s ease;
        }

        .vercel-btn:hover:not(:disabled) {
            background-color: var(--bg-color);
            color: var(--text-main);
        }

        .vercel-btn:active:not(:disabled) {
            transform: scale(0.97);
        }

        .vercel-btn:disabled {
            opacity: 0.6;
            cursor: not-allowed;
            transform: none;
        }

        .theme-toggle {
            border: 1px solid var(--border-color);
            background: var(--bg-color);
            color: var(--text-main);
            transition: all 0.2s ease;
        }

        .theme-toggle:hover {
            border-color: var(--text-main);
        }

        .fade-in {
            animation: fadeIn 0.8s ease-out forwards;
        }

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

        /* Spinner loading */
        .spinner {
            width: 16px;
            height: 16px;
            border: 2px solid rgba(255,255,255,0.3);
            border-radius: 50%;
            border-top-color: currentColor;
            animation: spin 0.6s linear infinite;
            display: inline-block;
        }
        @keyframes spin {
            to { transform: rotate(360deg); }
        }
        .btn-content {
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }