:root {
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --bg-gradient: linear-gradient(135deg, #0f172a 0%, #1e1b4b 100%);
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent-color: #10b981;
}

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

body {
    font-family: 'Inter', sans-serif;
    background: var(--bg-gradient);
    background-attachment: fixed;
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

.header {
    padding: 20px;
    display: flex;
    justify-content: center;
    position: sticky;
    top: 0;
    z-index: 100;
}

.return-button {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    color: var(--text-primary);
    padding: 10px 20px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 500;
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
}

.return-button:hover {
    background: var(--primary-color);
    border-color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: 0 10px 15px -3px rgba(99, 102, 241, 0.3);
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 40px 20px;
}

.tool-section {
    text-align: center;
    margin-bottom: 60px;
}

.main-title {
    font-family: 'Poppins', sans-serif;
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 10px;
    background: linear-gradient(to right, #818cf8, #c084fc);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.2rem;
    margin-bottom: 40px;
}

.glass-container {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    padding: 30px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

.input-area {
    margin-bottom: 25px;
}

.modern-textarea {
    width: 100%;
    min-height: 120px;
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    padding: 20px;
    color: #fff;
    font-size: 1.1rem;
    resize: vertical;
    transition: all 0.3s ease;
}

.modern-textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(99, 102, 241, 0.2);
}

.controls-area {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
    border-top: 1px solid var(--glass-border);
    border-bottom: 1px solid var(--glass-border);
    padding: 20px 0;
}

.control-group {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
}

.control-group label {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.align-buttons {
    display: flex;
    background: rgba(0, 0, 0, 0.2);
    border-radius: 10px;
    padding: 4px;
}

.align-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: 8px 12px;
    cursor: pointer;
    border-radius: 8px;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
}

.align-btn.active {
    background: var(--primary-color);
    color: #fff;
}

.modern-range {
    -webkit-appearance: none;
    appearance: none;
    width: 150px;
    height: 6px;
    background: rgba(0, 0, 0, 0.2);
    border-radius: 5px;
    outline: none;
}

.modern-range::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 18px;
    height: 18px;
    background: var(--primary-color);
    border-radius: 50%;
    cursor: pointer;
    transition: all 0.2s;
}

.modern-color {
    -webkit-appearance: none;
    appearance: none;
    border: none;
    width: 40px;
    height: 40px;
    border-radius: 10px;
    cursor: pointer;
    overflow: hidden;
    background: transparent;
}

.modern-color::-webkit-color-swatch-wrapper {
    padding: 0;
}

.modern-color::-webkit-color-swatch {
    border: none;
    border-radius: 10px;
}

.output-area {
    margin-top: 10px;
}

.output-wrapper {
    position: relative;
    background: rgba(0, 0, 0, 0.3);
    border: 1px dashed var(--glass-border);
    border-radius: 16px;
    padding: 30px;
    min-height: 100px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.output-preview {
    font-size: 24px;
    word-break: break-all;
    width: 100%;
}

.copy-btn {
    position: absolute;
    top: 10px;
    right: 10px;
    background: var(--accent-color);
    color: #fff;
    border: none;
    padding: 8px 15px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.85rem;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: all 0.3s ease;
}

.copy-btn:hover {
    background: #059669;
    transform: scale(1.05);
}

.style-selector {
    margin-top: 50px;
}

.section-title {
    font-size: 1.5rem;
    margin-bottom: 25px;
    color: var(--text-primary);
}

.styles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 15px;
}

.style-item {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 14px;
    padding: 20px;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    font-size: 1.2rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}

.style-item:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--primary-color);
    transform: translateY(-5px);
}

.style-item.active {
    background: rgba(99, 102, 241, 0.1);
    border-color: var(--primary-color);
    box-shadow: 0 0 20px rgba(99, 102, 241, 0.2);
}

.style-name {
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.ad-placeholder {
    background: var(--glass-bg);
    border: 1px dashed var(--glass-border);
    border-radius: 12px;
    padding: 20px;
    margin: 40px 0;
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.seo-article {
    margin-top: 80px;
    text-align: left;
    background: rgba(0, 0, 0, 0.2);
    padding: 40px;
    border-radius: 24px;
    border: 1px solid var(--glass-border);
}

.seo-article h2 {
    font-size: 2rem;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.seo-article h3 {
    font-size: 1.5rem;
    margin-top: 30px;
    margin-bottom: 15px;
    color: #818cf8;
}

.seo-article p {
    color: var(--text-secondary);
    margin-bottom: 20px;
    font-size: 1.1rem;
    line-height: 1.8;
}

.step-card {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    padding: 20px;
    margin-bottom: 20px;
    transition: transform 0.3s ease;
}

.step-card:hover {
    transform: translateX(10px);
    border-color: var(--primary-color);
}

.step-card strong {
    display: block;
    color: var(--primary-color);
    font-size: 1.2rem;
    margin-bottom: 8px;
}

.step-card p {
    margin-bottom: 0;
    font-size: 1rem;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    margin: 30px 0;
}

.feature-item {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    padding: 25px;
}

.feature-item strong {
    display: block;
    color: #818cf8;
    font-size: 1.1rem;
    margin-bottom: 10px;
}

.feature-item p {
    margin-bottom: 0;
    font-size: 0.95rem;
}

.faq-section {
    margin-top: 50px;
    border-top: 1px solid var(--glass-border);
    padding-top: 40px;
}

.faq-item {
    margin-bottom: 30px;
    background: rgba(255, 255, 255, 0.02);
    padding: 20px;
    border-radius: 12px;
}

.faq-item h3 {
    color: var(--text-primary);
    margin-bottom: 12px;
    font-size: 1.1rem;
    display: flex;
    align-items: flex-start;
    gap: 10px;
}

.faq-item h3::before {
    content: "Q:";
    color: var(--primary-color);
    font-weight: 700;
}

.faq-item p {
    margin-bottom: 0;
    padding-left: 28px;
}

.footer {
    text-align: center;
    padding: 40px;
    color: var(--text-secondary);
    border-top: 1px solid var(--glass-border);
}

@media (max-width: 768px) {
    .main-title {
        font-size: 2.5rem;
    }

    .glass-container {
        padding: 20px;
    }

    .controls-area {
        grid-template-columns: 1fr;
    }
}