/* ============================================================
   functions.css — Offline AI Pros component styles
   ============================================================ */

/* ── Utilities ─────────────────────────────────────────────── */

.container {
    width: 100%;
    max-width: var(--container-width);
    margin-inline: auto;
    padding-inline: var(--container-padding);
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* ── Buttons ───────────────────────────────────────────────── */

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius);
    font-family: var(--font-sans);
    font-size: 0.95rem;
    font-weight: 600;
    line-height: 1;
    cursor: pointer;
    border: none;
    transition: background-color var(--transition), color var(--transition), transform var(--transition);
    text-decoration: none;
}

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

.btn--primary:hover {
    background-color: var(--color-accent-hover);
    color: #ffffff;
    transform: translateY(-1px);
}

.btn--ghost {
    background-color: transparent;
    color: var(--color-accent);
    border: 1px solid var(--color-accent);
}

.btn--ghost:hover {
    background-color: var(--color-accent-dim);
    color: var(--color-accent);
}

/* ── Site Header ───────────────────────────────────────────── */

.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    height: var(--header-height);
    background-color: rgba(10, 10, 10, 0.92);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--header-height);
    gap: 2rem;
}

.site-logo {
    display: flex;
    align-items: center;
    flex-shrink: 0;
    text-decoration: none;
}

.site-logo img,
.site-logo svg {
    height: 32px;
    width: auto;
}

.logo-text {
    font-size: 1.1rem;
    font-weight: 800;
    color: var(--color-text);
    letter-spacing: -0.02em;
    white-space: nowrap;
}

.logo-text span {
    color: var(--color-accent);
}

/* Navigation */

.main-nav {
    display: flex;
    align-items: center;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    list-style: none;
}

.nav-menu a {
    display: block;
    padding: 0.4rem 0.75rem;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-text-muted);
    border-radius: var(--radius);
    transition: color var(--transition), background-color var(--transition);
}

.nav-menu a:hover,
.nav-menu .current-menu-item a {
    color: var(--color-text);
    background-color: var(--color-surface-2);
}

/* Hamburger */

.hamburger {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 40px;
    height: 40px;
    padding: 8px;
    background: none;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    cursor: pointer;
    flex-shrink: 0;
}

.hamburger span {
    display: block;
    width: 100%;
    height: 1.5px;
    background-color: var(--color-text);
    border-radius: 2px;
    transition: transform 0.2s ease, opacity 0.2s ease;
}

.hamburger.is-active span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.hamburger.is-active span:nth-child(2) { opacity: 0; }
.hamburger.is-active span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

/* Mobile nav */

.mobile-nav {
    display: none;
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    z-index: 99;
    background-color: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: 1rem var(--container-padding);
}

.mobile-nav.is-open {
    display: block;
}

.mobile-nav .nav-menu {
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
}

.mobile-nav .nav-menu a {
    font-size: 1rem;
    padding: 0.65rem 0.5rem;
    width: 100%;
}

/* ── Hero ──────────────────────────────────────────────────── */

.hero {
    padding: clamp(4rem, 10vw, 8rem) 0;
    background-color: var(--color-bg);
    background-image:
        linear-gradient(rgba(59, 130, 246, 0.04) 1px, transparent 1px),
        linear-gradient(90deg, rgba(59, 130, 246, 0.04) 1px, transparent 1px);
    background-size: 60px 60px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::after {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse 70% 50% at 50% 100%, rgba(59, 130, 246, 0.06), transparent);
    pointer-events: none;
}

.hero .container {
    position: relative;
    z-index: 1;
    max-width: 820px;
}

.hero__eyebrow {
    display: inline-block;
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--color-accent);
    background-color: var(--color-accent-dim);
    padding: 0.3rem 0.85rem;
    border-radius: 999px;
    margin-bottom: 1.5rem;
}

.hero__title {
    font-size: clamp(2.2rem, 5.5vw, 4rem);
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: -0.035em;
    color: var(--color-text);
    margin-bottom: 1.25rem;
}

.hero__subtitle {
    font-size: clamp(1rem, 2vw, 1.2rem);
    color: var(--color-text-muted);
    max-width: 560px;
    margin-inline: auto;
    margin-bottom: 2rem;
    line-height: 1.7;
}

.hero__actions {
    display: flex;
    gap: 0.75rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* ── Category Cards ────────────────────────────────────────── */

.categories-section {
    padding: 5rem 0;
    border-top: 1px solid var(--color-border);
}

.section-header {
    text-align: center;
    margin-bottom: 2.5rem;
}

.section-title {
    font-size: clamp(1.4rem, 3vw, 2rem);
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 0.5rem;
}

.section-subtitle {
    color: var(--color-text-muted);
    font-size: 1rem;
}

.category-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1rem;
}

.category-card {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
    padding: 1.5rem;
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    text-decoration: none;
    color: var(--color-text);
    transition: border-color var(--transition), background-color var(--transition), transform var(--transition);
}

.category-card:hover {
    border-color: var(--color-accent);
    background-color: var(--color-surface-2);
    color: var(--color-text);
    transform: translateY(-2px);
}

.category-card__icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    background-color: var(--color-accent-dim);
    border-radius: var(--radius);
    color: var(--color-accent);
    flex-shrink: 0;
}

.category-card__icon svg {
    width: 22px;
    height: 22px;
}

.category-card__name {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
}

.category-card__desc {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    line-height: 1.5;
}

.category-card__arrow {
    margin-top: auto;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-accent);
    letter-spacing: 0.02em;
}

/* ── Latest Articles ───────────────────────────────────────── */

.latest-section {
    padding: 5rem 0;
    border-top: 1px solid var(--color-border);
}

.section-actions {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 2rem;
}

.articles-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.25rem;
}

.article-card {
    display: flex;
    flex-direction: column;
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: border-color var(--transition), transform var(--transition);
    text-decoration: none;
    color: var(--color-text);
}

.article-card:hover {
    border-color: var(--color-accent);
    transform: translateY(-2px);
    color: var(--color-text);
}

.article-card__thumb {
    aspect-ratio: 16 / 9;
    overflow: hidden;
    background-color: var(--color-surface-2);
}

.article-card__thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.article-card:hover .article-card__thumb img {
    transform: scale(1.03);
}

.article-card__thumb-placeholder {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--color-surface-2) 0%, #1f2937 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-accent);
    font-size: 2rem;
    font-weight: 800;
    letter-spacing: -0.05em;
}

.article-card__body {
    display: flex;
    flex-direction: column;
    flex: 1;
    padding: 1.25rem;
    gap: 0.6rem;
}

.article-card__meta {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

.article-card__meta .sep {
    opacity: 0.4;
}

.article-card__cat {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-accent);
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.article-card__title {
    font-size: 1rem;
    font-weight: 700;
    line-height: 1.35;
    letter-spacing: -0.01em;
    color: var(--color-text);
}

.article-card__excerpt {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    line-height: 1.55;
}

/* ── Single Post ───────────────────────────────────────────── */

.single-wrapper {
    max-width: 740px;
    margin-inline: auto;
    padding: 3rem var(--container-padding) 5rem;
}

.single-header {
    margin-bottom: 2rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--color-border);
}

.single-cats {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    margin-bottom: 1rem;
}

.single-cat-badge {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-accent);
    background-color: var(--color-accent-dim);
    padding: 0.25rem 0.65rem;
    border-radius: 999px;
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.single-title {
    font-size: clamp(1.6rem, 4vw, 2.6rem);
    font-weight: 800;
    line-height: 1.15;
    letter-spacing: -0.03em;
    margin-bottom: 1.25rem;
}

.single-meta {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

.read-time-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-accent);
    background-color: var(--color-accent-dim);
    padding: 0.25rem 0.65rem;
    border-radius: 999px;
}

/* Affiliate disclosure */

.affiliate-disclosure {
    display: flex;
    gap: 0.75rem;
    align-items: flex-start;
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-left: 3px solid var(--color-accent);
    border-radius: var(--radius);
    padding: 0.9rem 1.1rem;
    margin-bottom: 2.5rem;
    font-size: 0.825rem;
    color: var(--color-text-muted);
    line-height: 1.5;
}

.affiliate-disclosure svg {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
    color: var(--color-accent);
    margin-top: 2px;
}

/* Article body typography */

.single-content {
    font-size: 1.05rem;
    line-height: 1.8;
    color: var(--color-text);
}

.single-content h2 {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--color-text);
    margin: 2.5rem 0 0.9rem;
    padding-top: 0.5rem;
    border-top: 1px solid var(--color-border);
}

.single-content h3 {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--color-text);
    margin: 1.75rem 0 0.6rem;
}

.single-content p {
    margin-bottom: 1.3rem;
    color: #e0e0e0;
}

.single-content a {
    color: var(--color-accent);
    text-decoration: underline;
    text-underline-offset: 3px;
    text-decoration-color: rgba(59, 130, 246, 0.4);
}

.single-content a:hover {
    text-decoration-color: var(--color-accent);
}

.single-content ul,
.single-content ol {
    margin: 0 0 1.3rem 1.5rem;
}

.single-content li {
    margin-bottom: 0.4rem;
    color: #e0e0e0;
}

.single-content strong {
    color: var(--color-text);
    font-weight: 600;
}

.single-content code {
    font-family: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;
    font-size: 0.88em;
    background-color: var(--color-surface-2);
    border: 1px solid var(--color-border);
    padding: 0.15em 0.4em;
    border-radius: 4px;
    color: #93c5fd;
}

.single-content pre {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 1.25rem;
    overflow-x: auto;
    margin: 0 0 1.5rem;
}

.single-content pre code {
    background: none;
    border: none;
    padding: 0;
    font-size: 0.9rem;
    color: #93c5fd;
}

.single-content blockquote {
    border-left: 3px solid var(--color-accent);
    margin: 1.5rem 0;
    padding: 0.75rem 1.25rem;
    background-color: var(--color-surface);
    border-radius: 0 var(--radius) var(--radius) 0;
    color: var(--color-text-muted);
    font-style: italic;
}

.single-content img {
    border-radius: var(--radius);
    margin: 1.5rem 0;
}

/* ── Site Footer ───────────────────────────────────────────── */

.site-footer {
    background-color: var(--color-surface);
    border-top: 1px solid var(--color-border);
    padding: 3rem 0 2rem;
}

.footer-inner {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 2rem;
    align-items: start;
    padding-bottom: 2rem;
    margin-bottom: 2rem;
    border-bottom: 1px solid var(--color-border);
}

.footer-brand .logo-text {
    font-size: 1rem;
    margin-bottom: 0.5rem;
    display: block;
}

.footer-tagline {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    max-width: 320px;
    line-height: 1.6;
}

.footer-nav {
    list-style: none;
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.footer-nav a {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    transition: color var(--transition);
}

.footer-nav a:hover {
    color: var(--color-text);
}

.footer-bottom {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    flex-wrap: wrap;
}

.footer-copyright {
    font-size: 0.8rem;
    color: var(--color-text-muted);
    line-height: 1.4;
}

.footer-affiliate-disclosure {
    font-size: 0.78rem;
    color: var(--color-text-muted);
    opacity: 0.7;
    line-height: 1.5;
    max-width: 680px;
}

/* ── Responsive ────────────────────────────────────────────── */

@media (max-width: 1024px) {
    .category-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

@media (max-width: 768px) {
    .main-nav {
        display: none;
    }

    .hamburger {
        display: flex;
    }

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

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

    .footer-inner {
        grid-template-columns: 1fr;
    }

    .footer-nav {
        gap: 1rem;
    }

    .section-actions {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }
}

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

    .hero__actions {
        flex-direction: column;
        align-items: center;
    }

    .btn {
        width: 100%;
        justify-content: center;
    }
}

/* ── Archive Pages ─────────────────────────────────────────── */

.archive-header {
    padding: 4rem 0 3.5rem;
    background-color: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
}

.archive-header__eyebrow {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--color-accent);
    background-color: var(--color-accent-dim);
    padding: 0.25rem 0.75rem;
    border-radius: 999px;
    margin-bottom: 1.25rem;
}

.archive-header__title {
    font-size: clamp(1.8rem, 4.5vw, 3rem);
    font-weight: 800;
    letter-spacing: -0.03em;
    color: var(--color-text);
    display: inline-block;
}

.archive-header__title::after {
    content: '';
    display: block;
    width: 48px;
    height: 3px;
    background-color: var(--color-accent);
    border-radius: 2px;
    margin-top: 0.85rem;
}

.archive-header__count {
    margin-top: 1.25rem;
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

.archive-header__desc {
    margin-top: 0.5rem;
    font-size: 1rem;
    color: var(--color-text-muted);
    max-width: 560px;
    line-height: 1.65;
}

/* ── Archive grid section ──────────────────────────────────── */

.archive-grid-section {
    padding: 3.5rem 0 5rem;
}

/* ── Thumbnail with category badge overlay ─────────────────── */

.archive-thumb {
    position: relative;
}

.archive-card__cat-badge {
    position: absolute;
    top: 0.65rem;
    left: 0.65rem;
    z-index: 2;
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.07em;
    text-transform: uppercase;
    color: #ffffff;
    background-color: var(--color-accent);
    padding: 0.2rem 0.6rem;
    border-radius: 999px;
    pointer-events: none;
    white-space: nowrap;
}

/* ── Article card title: white default, blue on hover ──────── */

.article-card__title a {
    color: var(--color-text);
    transition: color var(--transition);
}

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

/* ── Excerpt: clamp to 3 lines ─────────────────────────────── */

.article-card__excerpt {
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* ── Archive pagination ────────────────────────────────────── */

.archive-pagination {
    margin-top: 3rem;
    display: flex;
    justify-content: center;
}

.archive-pagination .nav-links {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    flex-wrap: wrap;
    justify-content: center;
}

.archive-pagination .page-numbers {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 2.5rem;
    height: 2.5rem;
    padding: 0 0.75rem;
    border-radius: var(--radius);
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-text-muted);
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    text-decoration: none;
    transition: color var(--transition), background-color var(--transition), border-color var(--transition);
}

.archive-pagination .page-numbers:hover {
    color: var(--color-text);
    background-color: var(--color-surface-2);
    border-color: var(--color-accent);
}

.archive-pagination .page-numbers.current {
    color: #ffffff;
    background-color: var(--color-accent);
    border-color: var(--color-accent);
    font-weight: 600;
}

.archive-pagination .page-numbers.dots {
    background: none;
    border-color: transparent;
    color: var(--color-text-muted);
    pointer-events: none;
}

.archive-pagination .prev,
.archive-pagination .next {
    font-size: 0.875rem;
    font-weight: 600;
    padding: 0 1rem;
}

/* ── No posts state ────────────────────────────────────────── */

.archive-no-posts {
    text-align: center;
    padding: 4rem 0;
    color: var(--color-text-muted);
    font-size: 1rem;
}

/* ── Archive responsive ────────────────────────────────────── */

@media (max-width: 640px) {
    .archive-header {
        padding: 2.5rem 0 2.5rem;
    }
}