/* ============================================
   BaseTools - News Website Stylesheet
   Google Discover & News Optimized
   ============================================ */

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

:root {
    --color-bg: #ffffff;
    --color-surface: #f8f9fa;
    --color-border: #e8eaed;
    --color-text: #1a1a2e;
    --color-text-secondary: #5f6368;
    --color-accent: #1a73e8;
    --color-accent-hover: #1557b0;
    --color-category: #e8f0fe;
    --color-category-text: #1a73e8;
    --color-red: #d93025;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-serif: 'Merriweather', Georgia, serif;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
    --shadow-lg: 0 8px 30px rgba(0,0,0,0.12);
    --radius: 12px;
    --radius-sm: 8px;
    --container-max: 1200px;
    --transition: 0.2s ease;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-sans);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

a {
    text-decoration: none;
    color: inherit;
}

/* Container */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 20px;
}

/* ============================================
   Header
   ============================================ */
.header {
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
    background: rgba(255,255,255,0.95);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    font-size: 1.4rem;
    color: var(--color-text);
    text-decoration: none;
}

.logo-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background: var(--color-accent);
    color: #fff;
    border-radius: var(--radius-sm);
    font-size: 1.2rem;
    font-weight: 800;
}

.logo-text {
    letter-spacing: -0.5px;
}

.nav {
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-link {
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    transition: all var(--transition);
}

.nav-link:hover,
.nav-link.active {
    background: var(--color-surface);
    color: var(--color-text);
}

.nav-link.active {
    background: var(--color-category);
    color: var(--color-accent);
    font-weight: 600;
}

.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.menu-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-text);
    border-radius: 2px;
    transition: all var(--transition);
}

/* ============================================
   Hero Section
   ============================================ */
.hero-section {
    margin: 24px 0 40px;
}

.hero-card {
    display: block;
    border-radius: var(--radius);
    overflow: hidden;
    background: var(--color-bg);
    box-shadow: var(--shadow-md);
    transition: box-shadow var(--transition), transform var(--transition);
}

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

.hero-image-wrapper {
    position: relative;
    aspect-ratio: 16/8.4;
    overflow: hidden;
}

.hero-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}

.hero-card:hover .hero-image {
    transform: scale(1.03);
}

.category-badge {
    position: absolute;
    top: 16px;
    left: 16px;
    background: var(--color-accent);
    color: #fff;
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.3px;
    text-transform: uppercase;
}

.hero-content {
    padding: 24px 28px 28px;
}

.hero-title {
    font-family: var(--font-serif);
    font-size: 1.75rem;
    font-weight: 700;
    line-height: 1.35;
    color: var(--color-text);
    margin-bottom: 12px;
}

.hero-card:hover .hero-title {
    color: var(--color-accent);
}

.hero-excerpt {
    font-size: 1rem;
    color: var(--color-text-secondary);
    line-height: 1.65;
    margin-bottom: 16px;
}

.hero-meta {
    display: flex;
    align-items: center;
    gap: 16px;
    font-size: 0.85rem;
    color: var(--color-text-secondary);
}

.hero-meta .author {
    font-weight: 600;
    color: var(--color-accent);
}

/* ============================================
   Sections
   ============================================ */
.section {
    margin-bottom: 48px;
}

.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 24px;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--color-text);
}

.section-title {
    font-size: 1.3rem;
    font-weight: 800;
    letter-spacing: -0.3px;
}

.see-all {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-accent);
    transition: color var(--transition);
}

.see-all:hover {
    color: var(--color-accent-hover);
}

/* ============================================
   Article Cards Grid
   ============================================ */
.articles-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.article-card {
    border-radius: var(--radius);
    overflow: hidden;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    transition: box-shadow var(--transition), transform var(--transition);
}

.article-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-3px);
}

.card-link {
    display: block;
}

.card-image-wrapper {
    aspect-ratio: 3/2;
    overflow: hidden;
}

.card-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}

.article-card:hover .card-image {
    transform: scale(1.05);
}

.card-content {
    padding: 16px 20px 20px;
}

.card-category {
    display: inline-block;
    font-size: 0.7rem;
    font-weight: 700;
    color: var(--color-category-text);
    background: var(--color-category);
    padding: 4px 10px;
    border-radius: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 10px;
}

.card-title {
    font-family: var(--font-serif);
    font-size: 1.05rem;
    font-weight: 700;
    line-height: 1.4;
    color: var(--color-text);
    margin-bottom: 8px;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.article-card:hover .card-title {
    color: var(--color-accent);
}

.card-excerpt {
    font-size: 0.88rem;
    color: var(--color-text-secondary);
    line-height: 1.55;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    margin-bottom: 12px;
}

.card-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 0.78rem;
    color: var(--color-text-secondary);
}

.read-time {
    font-weight: 500;
}

/* ============================================
   Article Page
   ============================================ */
.article-header {
    max-width: 800px;
    margin: 32px auto 0;
}

.breadcrumb {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.82rem;
    color: var(--color-text-secondary);
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.breadcrumb a {
    color: var(--color-accent);
    transition: color var(--transition);
}

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

.breadcrumb .separator {
    color: var(--color-border);
}

.article-category-tag {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 700;
    color: #fff;
    background: var(--color-accent);
    padding: 5px 14px;
    border-radius: 20px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 16px;
}

.article-title {
    font-family: var(--font-serif);
    font-size: 2.2rem;
    font-weight: 700;
    line-height: 1.3;
    color: var(--color-text);
    margin-bottom: 16px;
}

.article-subtitle {
    font-size: 1.15rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
    margin-bottom: 20px;
}

.article-info {
    display: flex;
    align-items: center;
    gap: 20px;
    padding: 16px 0;
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
    margin-bottom: 28px;
    flex-wrap: wrap;
}

.article-author {
    display: flex;
    align-items: center;
    gap: 10px;
}

.author-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--color-accent);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-weight: 700;
    font-size: 0.9rem;
}

.author-details .author-name {
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--color-text);
}

.author-details .author-role {
    font-size: 0.78rem;
    color: var(--color-text-secondary);
}

.article-date {
    font-size: 0.85rem;
    color: var(--color-text-secondary);
}

.article-date time {
    font-weight: 500;
}

/* Feature Image */
.article-feature-image {
    max-width: 960px;
    margin: 0 auto 32px;
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.article-feature-image img {
    width: 100%;
    aspect-ratio: 16/9;
    object-fit: cover;
}

.article-feature-image figcaption {
    padding: 10px 16px;
    font-size: 0.82rem;
    color: var(--color-text-secondary);
    background: var(--color-surface);
    text-align: center;
}

/* Article Body */
.article-body {
    max-width: 760px;
    margin: 0 auto;
    padding-bottom: 48px;
}

.article-body h2 {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-weight: 700;
    margin: 36px 0 16px;
    color: var(--color-text);
    line-height: 1.35;
}

.article-body h3 {
    font-size: 1.2rem;
    font-weight: 700;
    margin: 28px 0 12px;
    color: var(--color-text);
}

.article-body p {
    font-size: 1.05rem;
    line-height: 1.8;
    margin-bottom: 20px;
    color: #2d2d2d;
}

.article-body ul, .article-body ol {
    margin: 16px 0 20px 24px;
}

.article-body li {
    font-size: 1.05rem;
    line-height: 1.7;
    margin-bottom: 8px;
    color: #2d2d2d;
}

.article-body strong {
    font-weight: 700;
    color: var(--color-text);
}

.article-body a {
    color: var(--color-accent);
    font-weight: 500;
    border-bottom: 1px solid transparent;
    transition: border-color var(--transition);
}

.article-body a:hover {
    border-bottom-color: var(--color-accent);
}

/* Spec Table */
.spec-table-wrapper {
    overflow-x: auto;
    margin: 24px 0;
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-border);
}

.spec-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.92rem;
}

.spec-table thead {
    background: var(--color-text);
    color: #fff;
}

.spec-table th {
    padding: 14px 18px;
    text-align: left;
    font-weight: 700;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.spec-table td {
    padding: 12px 18px;
    border-bottom: 1px solid var(--color-border);
    color: #333;
    line-height: 1.5;
}

.spec-table tbody tr:nth-child(even) {
    background: var(--color-surface);
}

.spec-table tbody tr:hover {
    background: var(--color-category);
}

/* Article inline image */
.article-inline-image {
    margin: 28px 0;
    border-radius: var(--radius-sm);
    overflow: hidden;
}

.article-inline-image img {
    width: 100%;
    border-radius: var(--radius-sm);
}

.article-inline-image figcaption {
    padding: 8px 0;
    font-size: 0.82rem;
    color: var(--color-text-secondary);
    text-align: center;
    font-style: italic;
}

/* Key Highlights Box */
.highlights-box {
    background: var(--color-surface);
    border-left: 4px solid var(--color-accent);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    padding: 20px 24px;
    margin: 28px 0;
}

.highlights-box h3 {
    font-size: 1rem;
    font-weight: 700;
    margin: 0 0 12px;
    color: var(--color-accent);
}

.highlights-box ul {
    margin: 0;
    padding-left: 20px;
}

.highlights-box li {
    font-size: 0.95rem;
    line-height: 1.65;
    margin-bottom: 6px;
    color: #333;
}

/* Quick FAQ */
.faq-list {
    margin: 24px 0 0;
}

.faq-item {
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: #fff;
    margin-bottom: 12px;
    overflow: hidden;
}

.faq-item summary {
    list-style: none;
    cursor: pointer;
    padding: 16px 18px;
    font-weight: 700;
    color: var(--color-text-primary);
    position: relative;
}

.faq-item summary::-webkit-details-marker {
    display: none;
}

.faq-item summary::after {
    content: '+';
    position: absolute;
    right: 18px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 1.2rem;
    color: var(--color-accent);
}

.faq-item[open] summary::after {
    content: '−';
}

.faq-item p {
    margin: 0;
    padding: 0 18px 16px;
}

/* Tags */
.article-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 32px;
    padding-top: 24px;
    border-top: 1px solid var(--color-border);
}

.tag {
    display: inline-block;
    padding: 6px 14px;
    background: var(--color-surface);
    color: var(--color-text-secondary);
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
    transition: all var(--transition);
}

.tag:hover {
    background: var(--color-category);
    color: var(--color-accent);
}

/* ============================================
   Related Posts / More Articles
   ============================================ */
.related-posts {
    max-width: 1000px;
    margin: 0 auto 48px;
    padding-top: 40px;
    border-top: 2px solid var(--color-border);
}

.related-posts .section-header {
    margin-bottom: 24px;
    padding-bottom: 0;
    border-bottom: none;
}

.related-posts .section-title {
    font-size: 1.3rem;
    font-weight: 800;
    position: relative;
    padding-bottom: 12px;
}

.related-posts .section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 50px;
    height: 3px;
    background: var(--color-accent);
    border-radius: 2px;
}

.related-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.related-grid:empty {
    display: none;
}

.related-grid:empty + .no-related {
    display: block;
}

.no-related {
    display: none;
    text-align: center;
    color: var(--color-text-secondary);
    font-size: 0.9rem;
    padding: 20px;
}

/* ============================================
   Footer
   ============================================ */
.footer {
    background: #1a1a2e;
    color: #c9c9d6;
    padding: 48px 0 0;
    margin-top: 48px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 40px;
    padding-bottom: 40px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.footer-desc {
    font-size: 0.9rem;
    line-height: 1.65;
    margin-top: 16px;
    color: #9a9aaf;
}

.footer-links h4 {
    font-size: 0.9rem;
    font-weight: 700;
    color: #fff;
    margin-bottom: 16px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.footer-links a {
    display: block;
    font-size: 0.88rem;
    color: #9a9aaf;
    padding: 5px 0;
    transition: color var(--transition);
}

.footer-links a:hover {
    color: #fff;
}

.footer .logo-icon {
    background: var(--color-accent);
}

.footer .logo-text {
    color: #fff;
}

.footer-bottom {
    padding: 20px 0;
    text-align: center;
    font-size: 0.82rem;
    color: #6a6a7f;
}

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

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 1024px) {
    .articles-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .related-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .nav {
        display: none;
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        background: var(--color-bg);
        flex-direction: column;
        padding: 16px 20px;
        border-bottom: 1px solid var(--color-border);
        box-shadow: var(--shadow-md);
    }

    .nav.active {
        display: flex;
    }

    .nav-link {
        width: 100%;
        padding: 12px 16px;
        border-radius: var(--radius-sm);
    }

    .menu-toggle {
        display: flex;
    }

    .hero-title {
        font-size: 1.35rem;
    }

    .hero-content {
        padding: 18px 20px 22px;
    }

    .articles-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .related-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .article-card .card-link {
        display: flex;
        flex-direction: row;
    }

    .article-card .card-image-wrapper {
        flex: 0 0 130px;
        aspect-ratio: 1/1;
    }

    .article-card .card-content {
        padding: 10px 14px;
    }

    .article-card .card-title {
        font-size: 0.92rem;
        -webkit-line-clamp: 2;
        line-clamp: 2;
    }

    .article-card .card-excerpt {
        display: none;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .article-title {
        font-size: 1.6rem;
    }

    .article-body p,
    .article-body li {
        font-size: 1rem;
    }

    .spec-table th,
    .spec-table td {
        padding: 10px 12px;
        font-size: 0.82rem;
    }

    .section-header {
        margin-bottom: 18px;
    }
}

@media (max-width: 480px) {
    .hero-image-wrapper {
        aspect-ratio: 16/10;
    }

    .hero-title {
        font-size: 1.2rem;
    }

    .hero-excerpt {
        font-size: 0.9rem;
    }

    .article-title {
        font-size: 1.4rem;
    }

    .article-info {
        gap: 12px;
    }
}

/* ============================================
   Loading placeholder for images
   ============================================ */
img[src=""] ,
img:not([src]) {
    background: var(--color-surface);
    min-height: 200px;
}

/* Smooth page transitions */
.main {
    min-height: 60vh;
}

/* Print styles */
@media print {
    .header, .footer, .nav, .article-tags {
        display: none;
    }
    .article-body {
        max-width: 100%;
    }
}