/* =============================================================
   Email Aziendali — Micro-sito Blog
   CSS custom, mobile-first, variabili per replicabilita' collana

   Design system: per replicare su un altro micro-sito,
   cambiare SOLO le variabili in :root.
   ============================================================= */

/* --- Custom Properties --- */
:root {
    /* Palette — colori primari */
    --color-primary: #1a56db;
    --color-primary-dark: #1444af;
    --color-primary-light: #dbeafe;
    --color-primary-subtle: #eff6ff;
    --color-secondary: #4b5563;
    --color-accent: #2563eb;

    /* Gradiente brand — usato in hero, hover accent, decorazioni */
    --gradient-primary: linear-gradient(135deg, #1a56db 0%, #2563eb 50%, #3b82f6 100%);
    --gradient-hero: linear-gradient(160deg, #0f172a 0%, #1e3a5f 40%, #1a56db 100%);

    /* Testi */
    --color-text: #111827;
    --color-text-light: #6b7280;
    --color-text-on-dark: #f9fafb;
    --color-text-on-dark-muted: #94a3b8;

    /* Superfici */
    --color-bg: #ffffff;
    --color-surface: #f8fafc;
    --color-surface-elevated: #ffffff;
    --color-border: #e2e8f0;
    --color-border-light: #f1f5f9;

    /* Footer (sezione scura) */
    --color-footer-bg: #0f172a;
    --color-footer-text: #cbd5e1;
    --color-footer-text-muted: #64748b;
    --color-footer-border: #1e293b;

    /* Typography */
    --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-heading: var(--font-body);
    --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;

    /* Spacing & Layout */
    --max-width: 1140px;
    --max-width-content: 780px;
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
    --space-4xl: 5rem;

    /* Effects */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.08);
    --shadow-primary: 0 4px 14px rgba(26, 86, 219, 0.15);
    --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.04), 0 1px 2px rgba(0, 0, 0, 0.03);
    --shadow-card-hover: 0 10px 40px rgba(0, 0, 0, 0.08), 0 2px 8px rgba(0, 0, 0, 0.04);
    --radius: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-pill: 100px;

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-base: 0.25s ease;
    --transition-slow: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    margin: 0;
    font-family: var(--font-body);
    font-size: 1rem;
    line-height: 1.65;
    color: var(--color-text);
    background: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}
a:hover { color: var(--color-primary-dark); }

/* --- Container --- */
.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

.container--narrow {
    max-width: var(--max-width-content);
    margin: 0 auto;
}

/* --- Skip Link (a11y) --- */
.skip-link {
    position: absolute;
    top: -100%;
    left: var(--space-md);
    background: var(--color-primary);
    color: #fff;
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius);
    z-index: 1000;
    font-size: 0.875rem;
}
.skip-link:focus {
    top: var(--space-sm);
}

/* =============================================================
   HEADER
   ============================================================= */
.site-header {
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 100;
    transition: box-shadow var(--transition-base);
}

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

.site-brand {
    font-size: 1.2rem;
    font-weight: 800;
    color: var(--color-text);
    letter-spacing: -0.03em;
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}
.site-brand::before {
    content: "";
    display: inline-block;
    width: 8px;
    height: 28px;
    background: var(--gradient-primary);
    border-radius: 4px;
    flex-shrink: 0;
}
.site-brand:hover { color: var(--color-primary); }

/* Nav */
.site-nav {
    display: flex;
    gap: 2px;
}

.site-nav__link {
    color: var(--color-secondary);
    font-size: 0.8375rem;
    font-weight: 500;
    padding: 6px 12px;
    border-radius: var(--radius);
    transition: background var(--transition-fast), color var(--transition-fast);
    white-space: nowrap;
}
.site-nav__link:hover {
    background: var(--color-surface);
    color: var(--color-text);
}
.site-nav__link--active {
    color: var(--color-primary);
    background: var(--color-primary-subtle);
    font-weight: 600;
}

/* Hamburger */
.nav-toggle {
    display: none;
    background: none;
    border: none;
    padding: var(--space-sm);
    cursor: pointer;
    color: var(--color-text);
}

/* =============================================================
   HERO
   ============================================================= */
.hero {
    background: var(--gradient-hero);
    color: var(--color-text-on-dark);
    text-align: center;
    padding: var(--space-4xl) var(--space-lg) var(--space-3xl);
    /* Full-width breakout dal container */
    width: 100vw;
    position: relative;
    left: 50%;
    right: 50%;
    margin-left: -50vw;
    margin-right: -50vw;
    overflow: hidden;
}

/* Pattern decorativo sottile */
.hero::before {
    content: "";
    position: absolute;
    inset: 0;
    background-image:
        radial-gradient(circle at 20% 50%, rgba(59, 130, 246, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(37, 99, 235, 0.1) 0%, transparent 40%),
        radial-gradient(circle at 60% 80%, rgba(59, 130, 246, 0.08) 0%, transparent 45%);
    pointer-events: none;
}

/* Griglia decorativa sottile */
.hero::after {
    content: "";
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
    background-size: 60px 60px;
    pointer-events: none;
}

.hero > * {
    position: relative;
    z-index: 1;
}

.hero__badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.15);
    color: var(--color-primary-light);
    font-size: 0.8125rem;
    font-weight: 600;
    padding: 6px 16px;
    border-radius: var(--radius-pill);
    margin-bottom: var(--space-lg);
    letter-spacing: 0.02em;
    backdrop-filter: blur(4px);
}

.hero__title {
    font-size: 2.25rem;
    font-weight: 800;
    color: #ffffff;
    margin: 0 0 var(--space-md);
    letter-spacing: -0.03em;
    line-height: 1.15;
}

.hero__subtitle {
    font-size: 1.125rem;
    color: var(--color-text-on-dark-muted);
    margin: 0 auto;
    max-width: 560px;
    line-height: 1.6;
}

.hero__divider {
    width: 48px;
    height: 3px;
    background: rgba(59, 130, 246, 0.6);
    border: none;
    border-radius: 2px;
    margin: var(--space-xl) auto 0;
}

/* =============================================================
   SECTION TITLES
   ============================================================= */
.section-title {
    font-size: 1.375rem;
    font-weight: 800;
    margin: 0 0 var(--space-xl);
    color: var(--color-text);
    letter-spacing: -0.02em;
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.section-title::after {
    content: "";
    flex: 1;
    height: 1px;
    background: var(--color-border);
}

/* =============================================================
   ARTICLES GRID
   ============================================================= */
.articles-section {
    padding: var(--space-3xl) 0 var(--space-2xl);
}

.articles-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-xl);
    margin-bottom: var(--space-2xl);
}

/* =============================================================
   ARTICLE CARD
   ============================================================= */
.article-card {
    background: var(--color-surface-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition:
        box-shadow var(--transition-slow),
        transform var(--transition-slow),
        border-color var(--transition-base);
    box-shadow: var(--shadow-card);
}
.article-card:hover {
    box-shadow: var(--shadow-card-hover);
    transform: translateY(-3px);
    border-color: var(--color-primary-light);
}

.article-card__accent {
    height: 3px;
    background: var(--gradient-primary);
    opacity: 0;
    transition: opacity var(--transition-base);
}
.article-card:hover .article-card__accent {
    opacity: 1;
}

.article-card__body {
    padding: var(--space-xl) var(--space-lg) var(--space-lg);
}

.article-card__meta {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 0.8125rem;
    color: var(--color-text-light);
    margin-bottom: var(--space-sm);
}

.article-card__category {
    color: var(--color-primary);
    font-weight: 600;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}
.article-card__category:hover { color: var(--color-primary-dark); }

.article-card__title {
    font-size: 1.125rem;
    font-weight: 700;
    margin: 0 0 var(--space-sm);
    line-height: 1.35;
    letter-spacing: -0.01em;
}
.article-card__title a {
    color: var(--color-text);
    transition: color var(--transition-fast);
}
.article-card__title a:hover {
    color: var(--color-primary);
}

.article-card__excerpt {
    color: var(--color-text-light);
    font-size: 0.9375rem;
    line-height: 1.6;
    margin: 0;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* =============================================================
   CATEGORIES SECTION
   ============================================================= */
.categories-section {
    padding-bottom: var(--space-3xl);
}

.categories-list {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.categories-list__item {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: 10px 20px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-pill);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-secondary);
    transition:
        all var(--transition-base);
}
.categories-list__item::before {
    content: "";
    display: inline-block;
    width: 6px;
    height: 6px;
    background: var(--color-primary);
    border-radius: 50%;
    opacity: 0.4;
    transition: opacity var(--transition-fast), transform var(--transition-fast);
}
.categories-list__item:hover {
    background: var(--color-primary);
    color: #fff;
    border-color: var(--color-primary);
    box-shadow: var(--shadow-primary);
    transform: translateY(-1px);
}
.categories-list__item:hover::before {
    background: #fff;
    opacity: 1;
    transform: scale(1.3);
}

/* =============================================================
   BREADCRUMB
   ============================================================= */
.breadcrumb {
    font-size: 0.8125rem;
    color: var(--color-text-light);
    margin-bottom: var(--space-lg);
    padding-top: var(--space-lg);
}
.breadcrumb a { color: var(--color-text-light); }
.breadcrumb a:hover { color: var(--color-primary); }
.breadcrumb__separator {
    margin: 0 var(--space-sm);
    color: var(--color-border);
}

/* =============================================================
   ARTICLE PAGE
   ============================================================= */
.article-header {
    margin-bottom: var(--space-2xl);
}

.article-header__category {
    display: inline-block;
    color: var(--color-primary);
    font-weight: 600;
    font-size: 0.8125rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--space-sm);
}

.article-header__title {
    font-size: 2rem;
    font-weight: 800;
    line-height: 1.2;
    margin: 0 0 var(--space-md);
    letter-spacing: -0.025em;
    color: var(--color-text);
}

.article-header__meta {
    color: var(--color-text-light);
    font-size: 0.875rem;
}

/* Article content prose */
.article-content {
    font-size: 1.0625rem;
    line-height: 1.8;
    color: var(--color-text);
}
.article-content h2 {
    font-size: 1.5rem;
    font-weight: 700;
    margin: var(--space-2xl) 0 var(--space-md);
    letter-spacing: -0.02em;
}
.article-content h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin: var(--space-xl) 0 var(--space-sm);
}
.article-content p { margin: 0 0 var(--space-lg); }
.article-content ul, .article-content ol {
    margin: 0 0 var(--space-lg);
    padding-left: var(--space-xl);
}
.article-content li { margin-bottom: var(--space-sm); }
.article-content blockquote {
    border-left: 3px solid var(--color-primary);
    margin: var(--space-xl) 0;
    padding: var(--space-lg) var(--space-xl);
    background: var(--color-primary-subtle);
    color: var(--color-secondary);
    border-radius: 0 var(--radius) var(--radius) 0;
    font-style: italic;
}
.article-content pre {
    background: #0f172a;
    color: #e2e8f0;
    padding: var(--space-lg);
    border-radius: var(--radius-lg);
    overflow-x: auto;
    font-family: var(--font-mono);
    font-size: 0.875rem;
    margin: 0 0 var(--space-lg);
    border: 1px solid #1e293b;
}
.article-content code {
    font-family: var(--font-mono);
    font-size: 0.875em;
    background: var(--color-primary-subtle);
    color: var(--color-primary-dark);
    padding: 0.15em 0.4em;
    border-radius: 4px;
}
.article-content pre code {
    background: none;
    color: inherit;
    padding: 0;
}
.article-content a {
    color: var(--color-primary);
    text-decoration: underline;
    text-decoration-color: rgba(26, 86, 219, 0.3);
    text-underline-offset: 3px;
    transition: text-decoration-color var(--transition-fast);
}
.article-content a:hover {
    text-decoration-color: var(--color-primary);
}

/* =============================================================
   RELATED ARTICLES
   ============================================================= */
.related-articles {
    margin-top: var(--space-3xl);
    padding-top: var(--space-2xl);
    border-top: 1px solid var(--color-border);
}
.related-articles__title {
    font-size: 1.25rem;
    font-weight: 700;
    margin: 0 0 var(--space-lg);
}

/* =============================================================
   CATEGORY HEADER
   ============================================================= */
.category-header {
    margin-bottom: var(--space-2xl);
    padding-bottom: var(--space-xl);
    border-bottom: 1px solid var(--color-border);
}
.category-header__title {
    font-size: 2rem;
    font-weight: 800;
    margin: 0 0 var(--space-sm);
    letter-spacing: -0.025em;
}
.category-header__description {
    color: var(--color-text-light);
    font-size: 1.0625rem;
    margin: 0 0 var(--space-sm);
    line-height: 1.6;
}
.category-header__count {
    color: var(--color-text-light);
    font-size: 0.8125rem;
    margin: 0;
    font-weight: 500;
}

/* =============================================================
   EMPTY STATE
   ============================================================= */
.empty-state {
    text-align: center;
    padding: var(--space-4xl) var(--space-lg);
}
.empty-state::before {
    content: "";
    display: block;
    width: 64px;
    height: 64px;
    margin: 0 auto var(--space-xl);
    border-radius: var(--radius-xl);
    background: var(--color-primary-subtle);
    border: 2px dashed var(--color-primary-light);
}
.empty-state__title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-text);
    margin: 0 0 var(--space-sm);
}
.empty-state__text {
    color: var(--color-text-light);
    margin: 0;
    font-size: 0.9375rem;
}

/* =============================================================
   FOOTER
   ============================================================= */
.site-footer {
    background: var(--color-footer-bg);
    color: var(--color-footer-text);
    padding: var(--space-2xl) 0;
    margin-top: 0;
}

.site-footer .container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-md);
    text-align: center;
}

.site-footer__brand {
    font-size: 1.1rem;
    font-weight: 700;
    color: #ffffff;
    letter-spacing: -0.02em;
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-xs);
}
.site-footer__brand::before {
    content: "";
    display: inline-block;
    width: 6px;
    height: 22px;
    background: var(--gradient-primary);
    border-radius: 3px;
}

.site-footer__tagline {
    color: var(--color-footer-text-muted);
    font-size: 0.8125rem;
    margin: 0;
    line-height: 1.5;
}

.site-footer__divider {
    width: 40px;
    height: 1px;
    background: var(--color-footer-border);
    border: none;
    margin: var(--space-sm) 0;
}

.site-footer__copy {
    color: var(--color-footer-text-muted);
    font-size: 0.75rem;
    margin: 0;
}

.site-footer__credit {
    color: var(--color-footer-text-muted);
    font-size: 0.75rem;
    margin: 0;
}
.site-footer__credit a {
    color: var(--color-footer-text);
    font-weight: 600;
    transition: color var(--transition-fast);
}
.site-footer__credit a:hover {
    color: var(--color-primary-light);
}

/* =============================================================
   CONTACT PAGE
   ============================================================= */
.contact-page {
    padding: var(--space-2xl) 0 var(--space-3xl);
    max-width: var(--max-width-content);
    margin: 0 auto;
}

.contact-header {
    text-align: center;
    margin-bottom: var(--space-2xl);
}

.contact-header__title {
    font-size: 2rem;
    font-weight: 800;
    margin: 0 0 var(--space-md);
    letter-spacing: -0.025em;
    color: var(--color-text);
}

.contact-header__description {
    color: var(--color-text-light);
    font-size: 1.0625rem;
    margin: 0;
    line-height: 1.6;
    max-width: 560px;
    margin: 0 auto;
}

.contact-body {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-xl);
}

.contact-card {
    background: var(--color-surface-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--space-2xl) var(--space-xl);
    text-align: center;
    width: 100%;
    max-width: 480px;
    box-shadow: var(--shadow-md);
}

.contact-card__icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 72px;
    height: 72px;
    background: #e8faf0;
    color: #25D366;
    border-radius: 50%;
    margin-bottom: var(--space-lg);
}

.contact-card__title {
    font-size: 1.375rem;
    font-weight: 700;
    margin: 0 0 var(--space-sm);
    color: var(--color-text);
}

.contact-card__text {
    color: var(--color-text-light);
    font-size: 0.9375rem;
    line-height: 1.6;
    margin: 0 0 var(--space-xl);
}

.contact-whatsapp-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: 14px 32px;
    background: #25D366;
    color: #fff;
    border-radius: var(--radius-pill);
    font-weight: 700;
    font-size: 1rem;
    transition:
        background var(--transition-fast),
        box-shadow var(--transition-base),
        transform var(--transition-base);
    box-shadow: 0 4px 14px rgba(37, 211, 102, 0.3);
}
.contact-whatsapp-btn:hover {
    background: #20bd5a;
    box-shadow: 0 6px 20px rgba(37, 211, 102, 0.4);
    transform: translateY(-2px);
    color: #fff;
}
.contact-whatsapp-btn:active {
    transform: translateY(0);
}

.contact-info {
    text-align: center;
}

.contact-info__text {
    color: var(--color-text-light);
    font-size: 0.9375rem;
    margin: 0;
    line-height: 1.6;
    max-width: 480px;
}

/* =============================================================
   404 PAGE
   ============================================================= */
.page-404 {
    text-align: center;
    padding: var(--space-4xl) var(--space-lg);
}
.page-404__code {
    font-size: 5rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin: 0;
    line-height: 1;
}
.page-404__title {
    font-size: 1.5rem;
    font-weight: 700;
    margin: var(--space-md) 0 var(--space-sm);
}
.page-404__text {
    color: var(--color-text-light);
    margin: 0 0 var(--space-xl);
}
.page-404__link {
    display: inline-block;
    padding: 12px 28px;
    background: var(--gradient-primary);
    color: #fff;
    border-radius: var(--radius);
    font-weight: 600;
    font-size: 0.9375rem;
    transition: box-shadow var(--transition-base), transform var(--transition-base);
    box-shadow: var(--shadow-primary);
}
.page-404__link:hover {
    box-shadow: 0 6px 20px rgba(26, 86, 219, 0.25);
    transform: translateY(-1px);
    color: #fff;
}

/* =============================================================
   RESPONSIVE
   ============================================================= */

/* Mobile: hamburger */
@media (max-width: 767px) {
    .nav-toggle { display: block; }

    .site-nav {
        display: none;
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        background: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(12px);
        border-bottom: 1px solid var(--color-border);
        flex-direction: column;
        padding: var(--space-sm) var(--space-lg) var(--space-md);
        box-shadow: var(--shadow-lg);
    }
    .site-nav--open { display: flex; }

    .site-nav__link {
        padding: 10px 12px;
        font-size: 0.9375rem;
    }

    .hero {
        padding: var(--space-3xl) var(--space-lg) var(--space-2xl);
    }
    .hero__title { font-size: 1.75rem; }
    .hero__subtitle { font-size: 1rem; }

    .article-header__title { font-size: 1.5rem; }
    .category-header__title { font-size: 1.5rem; }

    .section-title::after { display: none; }
}

/* Tablet */
@media (min-width: 768px) {
    .articles-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .hero__title { font-size: 2.5rem; }
    .hero {
        padding: var(--space-4xl) var(--space-lg) var(--space-3xl);
    }
    .site-main { padding-top: var(--space-lg); }

    .site-footer .container {
        flex-direction: row;
        justify-content: space-between;
        text-align: left;
    }
    .site-footer__divider { display: none; }
    .site-footer__right {
        text-align: right;
    }
}

/* Desktop */
@media (min-width: 1024px) {
    .articles-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    .hero__title { font-size: 3rem; }
    .hero {
        padding: 5rem var(--space-lg) var(--space-4xl);
    }
}

/* Print */
@media print {
    .site-header, .site-footer, .nav-toggle, .skip-link { display: none; }
    body { font-size: 12pt; color: #000; }
    a { color: #000; text-decoration: underline; }
    .article-content { max-width: 100%; }
    .hero { background: none; color: #000; padding: 1rem 0; }
}