/* ================================================
   KidLink Pro — Blog Layout CSS
   Shared styles for all blog articles
   ================================================ */

:root {
    --primary: #4F46AD;
    --primary-dark: #3D3690;
    --primary-light: #6C63C7;
    --accent: #E8943A;
    --accent-dark: #D17E2A;
    --mint: #10B981;
    --sky: #3B82F6;
    --rose: #F43F5E;

    --gray-50: #FDFBF7;
    --gray-100: #F8F6F0;
    --gray-200: #EBE7DF;
    --gray-300: #C8C4BC;
    --gray-400: #A09B94;
    --gray-500: #7A7570;
    --gray-600: #5C574F;
    --gray-700: #3E3855;
    --gray-800: #2A2740;
    --gray-900: #1E1B3A;

    --font-display: 'Fraunces', Georgia, serif;
    --font-body: 'Plus Jakarta Sans', system-ui, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;

    --shadow-sm: 0 1px 2px rgba(30, 27, 58, 0.05);
    --shadow-md: 0 4px 6px rgba(30, 27, 58, 0.08);
    --shadow-lg: 0 10px 15px rgba(30, 27, 58, 0.1);
    --radius-full: 9999px;
}

/* --- Reset & Base --- */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

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

body {
    font-family: var(--font-body);
    font-size: 16px;
    line-height: 1.7;
    color: var(--gray-800);
    background: var(--gray-50);
}

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

a:hover {
    color: var(--primary-dark);
    text-decoration: underline;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* --- Blog Header --- */
.blog-header {
    background: white;
    border-bottom: 1px solid var(--gray-200);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.blog-header .container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.blog-header .logo-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
    color: var(--gray-900);
    font-weight: 700;
    font-size: 1.1rem;
}

.blog-header .logo-link img {
    height: 32px;
    width: auto;
}

.blog-header nav {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.blog-header nav a {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--gray-600);
}

.blog-header nav a:hover {
    color: var(--primary);
    text-decoration: none;
}

.blog-header .btn-trial {
    display: inline-flex;
    align-items: center;
    padding: 0.6rem 1.5rem;
    background: var(--accent);
    color: white;
    border: none;
    border-radius: var(--radius-full);
    font-weight: 700;
    font-size: 0.85rem;
    cursor: pointer;
    text-decoration: none;
    transition: background 0.2s ease;
}

.blog-header .btn-trial:hover {
    background: var(--accent-dark);
    text-decoration: none;
    color: white;
}

/* --- Breadcrumb --- */
.breadcrumb {
    max-width: 720px;
    margin: 2rem auto 0;
    padding: 0 1.5rem;
    font-size: 0.85rem;
    color: var(--gray-500);
}

.breadcrumb a {
    color: var(--gray-500);
    font-weight: 500;
}

.breadcrumb a:hover {
    color: var(--primary);
}

.breadcrumb span {
    margin: 0 0.4rem;
}

/* --- Article Container --- */
.article-container {
    max-width: 720px;
    margin: 0 auto;
    padding: 2rem 1.5rem 4rem;
}

/* --- Article Header --- */
.article-header {
    margin-bottom: 3rem;
}

.article-header .article-tag {
    display: inline-block;
    background: rgba(79, 70, 173, 0.1);
    color: var(--primary);
    padding: 0.35rem 1rem;
    border-radius: var(--radius-full);
    font-weight: 700;
    font-size: 0.8rem;
    margin-bottom: 1.25rem;
    letter-spacing: 0.02em;
}

.article-header h1 {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 700;
    line-height: 1.2;
    color: var(--gray-900);
    font-variation-settings: 'opsz' 36;
    margin-bottom: 1rem;
}

.article-meta {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    font-size: 0.85rem;
    color: var(--gray-500);
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--gray-200);
}

.article-meta .read-time {
    display: flex;
    align-items: center;
    gap: 0.3rem;
}

/* --- Article Content --- */
.article-content h2 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--gray-900);
    margin: 2.5rem 0 1rem;
    font-variation-settings: 'opsz' 24;
    line-height: 1.3;
}

.article-content h3 {
    font-family: var(--font-body);
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--gray-900);
    margin: 2rem 0 0.75rem;
}

.article-content p {
    margin-bottom: 1.25rem;
    color: var(--gray-700);
    line-height: 1.8;
}

.article-content ul,
.article-content ol {
    margin-bottom: 1.25rem;
    padding-left: 1.5rem;
}

.article-content li {
    margin-bottom: 0.5rem;
    color: var(--gray-700);
    line-height: 1.7;
}

.article-content strong {
    color: var(--gray-900);
    font-weight: 700;
}

.article-content blockquote {
    border-left: 4px solid var(--accent);
    background: rgba(232, 148, 58, 0.06);
    padding: 1.25rem 1.5rem;
    margin: 1.5rem 0;
    border-radius: 0 0.75rem 0.75rem 0;
    font-style: italic;
    color: var(--gray-700);
}

.article-content code {
    font-family: var(--font-mono);
    background: var(--gray-100);
    padding: 0.15rem 0.4rem;
    border-radius: 4px;
    font-size: 0.9em;
    color: var(--primary);
}

.article-content pre {
    background: var(--gray-900);
    color: var(--gray-100);
    padding: 1.5rem;
    border-radius: 0.75rem;
    overflow-x: auto;
    margin: 1.5rem 0;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    line-height: 1.6;
}

.article-content pre code {
    background: none;
    color: inherit;
    padding: 0;
}

/* --- Highlight Box --- */
.highlight-box {
    background: rgba(79, 70, 173, 0.06);
    border: 1px solid rgba(79, 70, 173, 0.15);
    border-radius: 1rem;
    padding: 1.5rem 2rem;
    margin: 2rem 0;
}

.highlight-box.accent {
    background: rgba(232, 148, 58, 0.06);
    border-color: rgba(232, 148, 58, 0.2);
}

.highlight-box.mint {
    background: rgba(16, 185, 129, 0.06);
    border-color: rgba(16, 185, 129, 0.2);
}

/* --- CTA Box --- */
.article-cta {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    color: white;
    padding: 3rem;
    border-radius: 1.5rem;
    text-align: center;
    margin: 3rem 0 2rem;
    position: relative;
    overflow: hidden;
}

.article-cta::before {
    content: '';
    position: absolute;
    top: -50px;
    right: -50px;
    width: 200px;
    height: 200px;
    background: white;
    opacity: 0.08;
    border-radius: 50%;
}

.article-cta h3 {
    font-family: var(--font-display);
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    color: white;
    position: relative;
}

.article-cta p {
    font-size: 1.05rem;
    opacity: 0.9;
    margin-bottom: 1.75rem;
    position: relative;
    color: white;
}

.article-cta .btn-cta {
    display: inline-block;
    padding: 1rem 2.5rem;
    background: var(--accent);
    color: white;
    border: none;
    border-radius: var(--radius-full);
    font-weight: 800;
    font-size: 1.05rem;
    cursor: pointer;
    text-decoration: none;
    transition: background 0.2s ease, transform 0.2s ease;
    position: relative;
}

.article-cta .btn-cta:hover {
    background: var(--accent-dark);
    transform: translateY(-2px);
    text-decoration: none;
    color: white;
}

.article-cta .cta-note {
    font-size: 0.8rem;
    opacity: 0.7;
    margin-top: 1rem;
    position: relative;
}

/* --- Related Articles --- */
.related-articles {
    margin: 3rem 0;
}

.related-articles h3 {
    font-family: var(--font-display);
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    color: var(--gray-900);
}

.related-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.25rem;
}

.related-card {
    background: white;
    border: 1px solid var(--gray-200);
    border-radius: 1rem;
    padding: 1.25rem;
    text-decoration: none;
    transition: box-shadow 0.2s ease, transform 0.2s ease;
}

.related-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
    text-decoration: none;
}

.related-card h4 {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--gray-900);
    line-height: 1.4;
    margin-bottom: 0.5rem;
}

.related-card p {
    font-size: 0.8rem;
    color: var(--gray-500);
    line-height: 1.5;
}

/* --- Blog Footer --- */
.blog-footer {
    background: var(--gray-900);
    color: white;
    padding: 3rem 0;
    text-align: center;
}

.blog-footer .container {
    max-width: 720px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

.blog-footer p {
    font-size: 0.85rem;
    opacity: 0.7;
    margin-bottom: 0.5rem;
}

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

/* --- Blog Index Page --- */
.blog-index-header {
    text-align: center;
    padding: 4rem 1.5rem 3rem;
    max-width: 720px;
    margin: 0 auto;
}

.blog-index-header h1 {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 0.75rem;
    font-variation-settings: 'opsz' 36;
}

.blog-index-header p {
    font-size: 1.1rem;
    color: var(--gray-600);
}

.blog-grid {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 1.5rem 4rem;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 2rem;
}

.blog-card {
    background: white;
    border: 1px solid var(--gray-200);
    border-radius: 1.25rem;
    overflow: hidden;
    text-decoration: none;
    display: flex;
    flex-direction: column;
    transition: box-shadow 0.3s ease, transform 0.3s ease;
}

.blog-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
    text-decoration: none;
}

.blog-card .card-icon {
    height: 160px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
}

.blog-card .card-icon.bg-primary {
    background: linear-gradient(135deg, rgba(79, 70, 173, 0.08), rgba(79, 70, 173, 0.15));
    color: var(--primary);
}

.blog-card .card-icon.bg-accent {
    background: linear-gradient(135deg, rgba(232, 148, 58, 0.08), rgba(232, 148, 58, 0.15));
    color: var(--accent);
}

.blog-card .card-icon.bg-mint {
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.08), rgba(16, 185, 129, 0.15));
    color: var(--mint);
}

.blog-card .card-icon.bg-sky {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.08), rgba(59, 130, 246, 0.15));
    color: var(--sky);
}

.blog-card .card-icon.bg-rose {
    background: linear-gradient(135deg, rgba(244, 63, 94, 0.08), rgba(244, 63, 94, 0.15));
    color: var(--rose);
}

.blog-card-body {
    padding: 1.5rem;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.blog-card-body .card-tag {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--primary);
    margin-bottom: 0.5rem;
}

.blog-card-body h2 {
    font-family: var(--font-display);
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--gray-900);
    line-height: 1.35;
    margin-bottom: 0.75rem;
    font-variation-settings: 'opsz' 24;
}

.blog-card-body p {
    font-size: 0.9rem;
    color: var(--gray-600);
    line-height: 1.6;
    flex: 1;
}

.blog-card-body .card-meta {
    display: flex;
    align-items: center;
    gap: 1rem;
    font-size: 0.8rem;
    color: var(--gray-400);
    margin-top: 1rem;
    padding-top: 0.75rem;
    border-top: 1px solid var(--gray-100);
}

.blog-lang-section {
    max-width: 1000px;
    margin: 0 auto 2rem;
    padding: 0 1.5rem;
}

.blog-lang-section h2 {
    font-family: var(--font-display);
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 1.25rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--gray-200);
}

/* --- Responsive --- */
@media (max-width: 768px) {
    .article-header h1 {
        font-size: 1.6rem;
    }

    .article-content h2 {
        font-size: 1.25rem;
    }

    .article-cta {
        padding: 2rem 1.5rem;
    }

    .article-cta h3 {
        font-size: 1.4rem;
    }

    .blog-index-header h1 {
        font-size: 1.8rem;
    }

    .blog-grid {
        grid-template-columns: 1fr;
    }

    .blog-header nav {
        display: none;
    }

    .related-grid {
        grid-template-columns: 1fr;
    }

    .article-meta {
        flex-wrap: wrap;
        gap: 0.75rem;
    }
}

@media (max-width: 480px) {
    .article-container {
        padding: 1.5rem 1rem 3rem;
    }

    .breadcrumb {
        padding: 0 1rem;
    }
}