:root {
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-tertiary: #e9ecef;
    --text-primary: #212529;
    --text-secondary: #495057;
    --text-muted: #6c757d;
    --border-color: #dee2e6;
    --accent-color: #4361ee;
    --accent-hover: #3a56d4;
    --success-color: #28a745;
    --warning-color: #ffc107;
    --danger-color: #dc3545;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.15);
}

[data-theme="dark"] {
    --bg-primary: #1a1a2e;
    --bg-secondary: #16213e;
    --bg-tertiary: #0f3460;
    --text-primary: #eaeaea;
    --text-secondary: #b8b8b8;
    --text-muted: #888888;
    --border-color: #3a3a5c;
    --accent-color: #4cc9f0;
    --accent-hover: #3db8e0;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.4);
}

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    transition: background-color 0.3s ease, color 0.3s ease;
    -webkit-text-size-adjust: 100%;
}

a {
    color: var(--accent-color);
    text-decoration: none;
    transition: color 0.2s ease;
}

a:hover {
    color: var(--accent-hover);
}

header {
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow);
}

.header-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.logo-icon {
    font-size: 1.8rem;
}

nav {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    flex-wrap: wrap;
}

.nav-link {
    padding: 0.5rem 0.8rem;
    border-radius: 6px;
    color: var(--text-secondary);
    font-size: 0.95rem;
    font-weight: 500;
    transition: all 0.2s ease;
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.nav-link:hover {
    background-color: var(--bg-tertiary);
    color: var(--accent-color);
}

.nav-link.active {
    background-color: var(--accent-color);
    color: white;
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-primary);
    padding: 0.5rem;
    min-height: 44px;
    min-width: 44px;
    align-items: center;
    justify-content: center;
}

.theme-toggle {
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    cursor: pointer;
    transition: all 0.2s ease;
    flex-shrink: 0;
}

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

main {
    flex: 1;
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem 1rem;
    width: 100%;
}

.hero {
    text-align: center;
    margin-bottom: 2rem;
}

.hero h1 {
    font-size: clamp(1.8rem, 5vw, 2.5rem);
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.hero p {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.tool-container {
    background-color: var(--bg-secondary);
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: var(--shadow);
    margin-bottom: 2rem;
}

textarea {
    width: 100%;
    min-height: 200px;
    padding: 1rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    font-family: inherit;
    resize: vertical;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    transition: border-color 0.2s ease;
    -webkit-tap-highlight-color: transparent;
    touch-action: pan-y;
}

textarea:focus {
    outline: none;
    border-color: var(--accent-color);
}

textarea::placeholder {
    color: var(--text-muted);
}

textarea:placeholder-shown {
    opacity: 1;
}

.button-group {
    display: flex;
    gap: 0.75rem;
    margin-top: 1rem;
    flex-wrap: wrap;
}

.btn {
    padding: 0.6rem 1.2rem;
    border: none;
    border-radius: 6px;
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    min-height: 44px;
    -webkit-tap-highlight-color: transparent;
    user-select: none;
}

.btn:active {
    transform: scale(0.98);
}

.btn-primary {
    background-color: var(--accent-color);
    color: white;
}

.btn-primary:hover,
.btn-primary:focus {
    background-color: var(--accent-hover);
}

.btn-secondary {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover,
.btn-secondary:focus {
    background-color: var(--border-color);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
    margin-top: 1.5rem;
}

.stat-card {
    background-color: var(--bg-tertiary);
    border-radius: 8px;
    padding: 1rem;
    text-align: center;
    border: 1px solid var(--border-color);
}

.stat-value {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--accent-color);
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 0.25rem;
}

.keywords-section {
    margin-top: 2rem;
}

.keywords-section h3 {
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.keywords-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.keyword-item {
    background-color: var(--bg-tertiary);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.9rem;
    border: 1px solid var(--border-color);
}

.keyword-item span {
    color: var(--accent-color);
    font-weight: 600;
}

.social-warnings {
    margin-top: 1.5rem;
    padding: 1rem;
    background-color: var(--bg-tertiary);
    border-radius: 8px;
    border-left: 4px solid var(--warning-color);
}

.social-warnings h4 {
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.warning-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border-color);
}

.warning-item:last-child {
    border-bottom: none;
}

.warning-status {
    padding: 0.25rem 0.75rem;
    border-radius: 4px;
    font-size: 0.85rem;
    font-weight: 500;
}

.status-ok {
    background-color: rgba(40, 167, 69, 0.2);
    color: var(--success-color);
}

.status-warning {
    background-color: rgba(255, 193, 7, 0.2);
    color: #856404;
}

.status-error {
    background-color: rgba(220, 53, 69, 0.2);
    color: var(--danger-color);
}

.privacy-notice {
    background-color: var(--bg-tertiary);
    padding: 1rem;
    border-radius: 8px;
    margin-top: 2rem;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.privacy-notice strong {
    color: var(--text-secondary);
}

footer {
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 2rem 1rem;
    margin-top: auto;
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
}

.footer-section h4 {
    color: var(--text-primary);
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

.footer-section ul {
    list-style: none;
}

.footer-section li {
    margin-bottom: 0.5rem;
}

.footer-section a {
    color: var(--text-secondary);
}

.footer-section a:hover {
    color: var(--accent-color);
}

.footer-bottom {
    max-width: 1200px;
    margin: 2rem auto 0;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
    text-align: center;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.character-breakdown {
    margin-top: 1.5rem;
}

.breakdown-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 1rem;
    margin-top: 1rem;
}

.breakdown-item {
    background-color: var(--bg-tertiary);
    padding: 1rem;
    border-radius: 8px;
    text-align: center;
    border: 1px solid var(--border-color);
}

.breakdown-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent-color);
}

.breakdown-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 0.25rem;
}

.keyword-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 1rem;
}

.keyword-table th,
.keyword-table td {
    padding: 0.75rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.keyword-table th {
    background-color: var(--bg-tertiary);
    font-weight: 600;
    color: var(--text-primary);
}

.keyword-table tr:hover {
    background-color: var(--bg-tertiary);
}

.no-results {
    text-align: center;
    padding: 2rem;
    color: var(--text-muted);
}

@media (max-width: 768px) {
    .header-container {
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
    }

    .mobile-menu-btn {
        display: flex;
        order: 2;
    }

    nav {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: var(--bg-secondary);
        border-bottom: 1px solid var(--border-color);
        padding: 1rem;
        flex-direction: column;
        gap: 0.25rem;
        box-shadow: var(--shadow-lg);
    }

    nav.active {
        display: flex;
    }

    .nav-link {
        width: 100%;
        min-height: 48px;
        padding: 0.75rem 1rem;
        font-size: 1rem;
        text-align: left;
    }

    main {
        padding: 1rem;
    }

    .tool-container {
        padding: 1rem;
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.75rem;
    }

    .stat-card {
        padding: 0.75rem;
    }

    .stat-value {
        font-size: 1.5rem;
    }

    .button-group {
        flex-direction: column;
        gap: 0.5rem;
    }

    .btn {
        width: 100%;
        min-height: 48px;
        justify-content: center;
        font-size: 1rem;
        padding: 0.75rem 1.5rem;
    }

    textarea {
        min-height: 200px;
        font-size: 1rem;
    }

    .hero h1 {
        font-size: 1.75rem;
    }

    .hero p {
        font-size: 1rem;
    }
}

@media (max-width: 480px) {
    .stats-grid {
        grid-template-columns: 1fr;
    }

    .breakdown-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .keyword-table {
        font-size: 0.8rem;
        display: block;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }

    .keyword-table th,
    .keyword-table td {
        padding: 0.5rem 0.3rem;
    }

    .footer-container {
        flex-direction: column;
        gap: 1.5rem;
        text-align: center;
    }

    .footer-section ul {
        display: flex;
        flex-wrap: wrap;
        justify-content: center;
        gap: 1rem;
    }

    .footer-section li {
        margin-bottom: 0;
    }

    .hero h1 {
        font-size: 1.5rem;
    }

    .privacy-notice {
        font-size: 0.85rem;
        padding: 0.75rem;
    }
}

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

.fade-in {
    animation: fadeIn 0.3s ease;
}

.blog-container {
    display: grid;
    grid-template-columns: 1fr 320px;
    gap: 2rem;
    margin-top: 1rem;
}

.blog-posts {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.blog-post {
    background-color: var(--bg-secondary);
    border-radius: 12px;
    padding: 1.5rem;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

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

.blog-post .post-date {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 0.75rem;
    display: inline-block;
}

.blog-post h2 {
    margin-bottom: 0.75rem;
}

.blog-post h2 a {
    color: var(--text-primary);
    text-decoration: none;
    font-size: 1.3rem;
}

.blog-post h2 a:hover {
    color: var(--accent-color);
}

.post-excerpt {
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 1rem;
}

.post-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.tag {
    background-color: var(--bg-tertiary);
    padding: 0.3rem 0.7rem;
    border-radius: 20px;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.blog-sidebar {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.sidebar-section {
    background-color: var(--bg-secondary);
    border-radius: 12px;
    padding: 1.5rem;
    border: 1px solid var(--border-color);
}

.sidebar-section h3 {
    color: var(--text-primary);
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

.sidebar-section ul {
    list-style: none;
}

.sidebar-section li {
    margin-bottom: 0.75rem;
}

.sidebar-section a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.2s ease;
}

.sidebar-section a:hover {
    color: var(--accent-color);
}

.subscribe-form {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-top: 1rem;
}

.subscribe-form input {
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-size: 0.95rem;
}

.subscribe-form input:focus {
    outline: none;
    border-color: var(--accent-color);
}

.subscribe-form input::placeholder {
    color: var(--text-muted);
}

@media (max-width: 900px) {
    .blog-container {
        grid-template-columns: 1fr;
    }

    .blog-sidebar {
        order: -1;
    }
}

@media (max-width: 480px) {
    .blog-post h2 a {
        font-size: 1.15rem;
    }

    .post-excerpt {
        font-size: 0.95rem;
    }
}

.blog-article {
    background-color: var(--bg-secondary);
    border-radius: 12px;
    padding: 2rem;
    border: 1px solid var(--border-color);
    max-width: 800px;
    margin: 0 auto;
}

.article-date {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
    display: inline-block;
}

.blog-article h1 {
    font-size: 2rem;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
    line-height: 1.3;
}

.article-content {
    line-height: 1.8;
    color: var(--text-secondary);
}

.article-content h2 {
    color: var(--text-primary);
    margin-top: 2rem;
    margin-bottom: 1rem;
    font-size: 1.4rem;
}

.article-content h3 {
    color: var(--text-primary);
    margin-top: 1.5rem;
    margin-bottom: 0.75rem;
    font-size: 1.2rem;
}

.article-content p {
    margin-bottom: 1rem;
}

.article-content ul,
.article-content ol {
    margin-bottom: 1rem;
    padding-left: 1.5rem;
}

.article-content li {
    margin-bottom: 0.5rem;
}

.article-content strong {
    color: var(--text-primary);
}

.article-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
}