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

        body {
            background: #f5f5f5;
            font-family: system-ui, -apple-system, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
            padding: 2rem 1.5rem;
            color: #222;
        }

        .container {
            max-width: 1000px;
            margin: 0 auto;
        }

        /* brand header - subtle */
        .brand {
            margin-bottom: 1.5rem;
            display: flex;
            align-items: baseline;
            gap: 0.75rem;
            flex-wrap: wrap;
        }

        .brand h1 {
            font-weight: 450;
            font-size: 1.8rem;
            letter-spacing: -0.02em;
            color: #2a2a2a;
        }

        .brand .centrigon {
            font-weight: 500;
            color: #6b4f3f;
            background: #ede8e3;
            padding: 0.2rem 0.8rem;
            border-radius: 40px;
            font-size: 0.9rem;
        }

        .brand .tagline {
            color: #777;
            font-size: 0.95rem;
            font-weight: 350;
        }

        /* input area */
        .input-block {
            background: white;
            border-radius: 16px;
            padding: 1.5rem;
            margin-bottom: 2rem;
            border: 1px solid #e0e0e0;
        }

        .input-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 1rem;
            font-size: 0.9rem;
            color: #666;
        }

        .tools {
            display: flex;
            gap: 0.5rem;
        }

        .tools button {
            background: none;
            border: 1px solid #ccc;
            padding: 0.3rem 1rem;
            border-radius: 30px;
            font-size: 0.8rem;
            cursor: pointer;
            color: #444;
        }

        .tools button:hover {
            background: #f0f0f0;
        }

        textarea {
            width: 100%;
            padding: 1rem;
            font-size: 1.3rem;
            border: 1px solid #ccc;
            border-radius: 12px;
            font-family: inherit;
            resize: vertical;
            margin-bottom: 1rem;
        }

        textarea:focus {
            outline: none;
            border-color: #888;
        }

        .control-row {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 1.5rem;
            margin-top: 0.5rem;
        }

        .safe-toggle {
            display: flex;
            align-items: center;
            gap: 0.8rem;
        }

        .safe-toggle button {
            background: #aaa;  /* default off state */
            color: white;
            border: none;
            padding: 0.4rem 1.2rem;
            border-radius: 30px;
            font-weight: 500;
            cursor: pointer;
            transition: 0.1s;
        }

        .safe-toggle button.on {
            background: #222;
        }

        .random-btn {
            background: white;
            border: 1px solid #999;
            padding: 0.4rem 1.5rem;
            border-radius: 30px;
            cursor: pointer;
            display: flex;
            align-items: center;
            gap: 0.4rem;
        }

        .slider-group {
            display: flex;
            gap: 2rem;
            background: #f0f0f0;
            padding: 0.7rem 1.5rem;
            border-radius: 40px;
            margin-top: 1rem;
            flex-wrap: wrap;
        }

        .slider-item {
            display: flex;
            align-items: center;
            gap: 0.8rem;
        }

        .slider-item label {
            font-size: 0.85rem;
            font-weight: 500;
            min-width: 45px;
        }

        /* style cards - one per row */
        .category {
            margin: 2rem 0 1rem 0;
        }

        .category h2 {
            font-weight: 500;
            font-size: 1.3rem;
            margin-bottom: 1rem;
            padding-bottom: 0.3rem;
            border-bottom: 1px solid #ccc;
            color: #2a2a2a;
        }

        .cards {
            display: flex;
            flex-direction: column;
            gap: 0.75rem;
        }

        .card {
            background: white;
            border: 1px solid #ddd;
            border-radius: 14px;
            padding: 1rem 1.5rem;
            display: flex;
            align-items: center;
            justify-content: space-between;
            cursor: pointer;
            width: 100%;
            transition: 0.1s;
        }

        .card:hover {
            background: #fafafa;
            border-color: #aaa;
        }

        .card:active {
            background: #f0f0f0;
        }

        .card-left {
            min-width: 120px;
            flex-shrink: 0;
        }

        .style-name {
            font-size: 0.85rem;
            font-weight: 600;
            color: #777;
            text-transform: uppercase;
            letter-spacing: 0.3px;
        }

        .copy-hint {
            font-size: 0.7rem;
            color: #aaa;
            margin-top: 0.2rem;
        }

        .preview {
            font-size: 1.3rem;
            line-height: 1.4;
            font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
            word-break: break-word;
            text-align: right;
            padding-left: 1.5rem;
            max-width: 80%;
        }

        .toast {
            position: fixed;
            bottom: 30px;
            right: 30px;
            background: #222;
            color: white;
            padding: 0.6rem 1.5rem;
            border-radius: 40px;
            font-size: 0.9rem;
            opacity: 0;
            transition: opacity 0.15s;
            pointer-events: none;
            z-index: 1000;
        }

        .footer {
            margin-top: 3rem;
            text-align: center;
            color: #888;
            font-size: 0.8rem;
            border-top: 1px solid #ddd;
            padding-top: 2rem;
        }

        /* SEO Content Styling */
.seo-content {
    max-width: 1000px;
    margin: 2rem auto 0;
}

.seo-block {
    background: white;
    border-radius: 20px;
    padding: 1.75rem 2rem;
    margin-bottom: 1.5rem;
    border: 1px solid #e8e8e8;
    transition: box-shadow 0.2s ease;
}

.seo-block:hover {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.04);
}

.seo-block h2 {
    font-size: 1.5rem;
    font-weight: 600;
    color: #2a2a2a;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid #6b4f3f;
    display: inline-block;
}

.seo-block h3 {
    font-size: 1.2rem;
    font-weight: 500;
    color: #6b4f3f;
    margin: 1.25rem 0 0.5rem 0;
}

.seo-block p {
    color: #444;
    line-height: 1.65;
    margin-bottom: 1rem;
    font-size: 1rem;
}

.seo-block strong {
    color: #2a2a2a;
    font-weight: 600;
}

.seo-block ul, .seo-block ol {
    margin: 0.75rem 0 1rem 1.75rem;
    color: #444;
    line-height: 1.65;
}

.seo-block li {
    margin-bottom: 0.5rem;
    font-size: 1rem;
}

.seo-block li strong {
    color: #6b4f3f;
}

.seo-block a {
    color: #6b4f3f;
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: border-color 0.2s ease;
}

.seo-block a:hover {
    border-bottom-color: #6b4f3f;
}

/* Visually Hidden - Accessibility & SEO */
.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Responsive */
@media (max-width: 768px) {
    .seo-block {
        padding: 1.25rem 1.25rem;
        border-radius: 16px;
        margin-bottom: 1rem;
    }
    
    .seo-block h2 {
        font-size: 1.25rem;
    }
    
    .seo-block h3 {
        font-size: 1.05rem;
    }
    
    .seo-block p,
    .seo-block li {
        font-size: 0.9rem;
    }
    
    .seo-block ul, 
    .seo-block ol {
        margin-left: 1.25rem;
    }
}

/* Print styles */
@media print {
    .seo-block {
        background: white;
        border: 1px solid #ccc;
        page-break-inside: avoid;
        box-shadow: none;
    }
    
    .seo-block h2 {
        color: #000;
        border-bottom-color: #000;
    }
    
    .seo-block a {
        color: #000;
        text-decoration: underline;
    }
}