/* =============================================================
   GOOGLE I/O 2026 — Biolatti.it special section
   Design System: Segnale Caldo (Biolatti visual identity v1)
   Palette: Yellow #FFC300 | Teal #00796B | Terra #E96D50
            Dark #2B2B2B | Light #F8F8F6
   Font:    Montserrat (head) + Lato (body)
   ============================================================= */

@import url('https://fonts.googleapis.com/css2?family=Montserrat:wght@400;600;700;800&family=Lato:wght@400;700&display=swap');

/* -------------------------------------------------------------
   1. CSS VARIABLES
   ------------------------------------------------------------- */
:root {
  --color-yellow:  #FFC300;
  --color-yellow-d:#E6AF00;
  --color-teal:    #00796B;
  --color-teal-d:  #005F56;
  --color-terra:   #E96D50;
  --color-terra-d: #D4573B;
  --color-dark:    #2B2B2B;
  --color-light:   #F8F8F6;
  --color-white:   #FFFFFF;
  --color-gray:    #888888;
  --color-line:    #E8E5DE;
  --font-head:     'Montserrat', sans-serif;
  --font-body:     'Lato', sans-serif;
  --radius:        6px;
  --radius-lg:     12px;
  --shadow:        0 8px 32px rgba(0,0,0,.08);
  --shadow-hover:  0 16px 48px rgba(0,0,0,.15);
  --transition:    .25s ease;
  --max-width:     1200px;
}

/* -------------------------------------------------------------
   2. RESET + BASE
   ------------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 17px; scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 400;
  line-height: 1.75;
  color: var(--color-dark);
  background-color: var(--color-light);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
img, svg, picture, video { display: block; max-width: 100%; }
a { color: var(--color-teal); text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 3px; transition: color var(--transition); }
a:hover { color: var(--color-terra); }
ul, ol { list-style: none; }
p { line-height: 1.75; margin-bottom: 1rem; }

/* -------------------------------------------------------------
   3. TIPOGRAFIA
   ------------------------------------------------------------- */
h1, h2, h3, h4, h5, h6 { font-family: var(--font-head); line-height: 1.15; color: var(--color-dark); margin-bottom: 1rem; }
h1 { font-size: clamp(40px, 5.5vw, 64px); font-weight: 800; letter-spacing: -1.2px; }
h2 { font-size: clamp(30px, 3.5vw, 40px); font-weight: 700; letter-spacing: -0.5px; margin-top: 2.5rem; }
h3 { font-size: clamp(22px, 2.2vw, 26px); font-weight: 600; margin-top: 2rem; }
h4 { font-size: 19px; font-weight: 600; margin-top: 1.5rem; }
.eyebrow {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 2.5px;
  color: var(--color-terra);
  display: inline-block;
  margin-bottom: 1rem;
}
blockquote {
  font-family: var(--font-head);
  font-size: 1.2rem;
  font-weight: 600;
  font-style: italic;
  border-left: 4px solid var(--color-yellow);
  padding: 0.5rem 0 0.5rem 1.5rem;
  margin: 2rem 0;
  color: var(--color-dark);
}

/* -------------------------------------------------------------
   4. LAYOUT
   ------------------------------------------------------------- */
.container { max-width: var(--max-width); width: 100%; margin: 0 auto; padding: 0 2rem; }
.container--narrow { max-width: 800px; margin: 0 auto; padding: 0 2rem; }
section { padding: 4rem 0; }
section.section--tight { padding: 2.5rem 0; }

/* -------------------------------------------------------------
   5. HEADER + NAV
   ------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--color-dark);
  border-bottom: 3px solid var(--color-yellow);
}
.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
  gap: 1rem;
}
.site-logo { display: flex; align-items: center; gap: 0.75rem; text-decoration: none; }
.site-logo__mark { width: 36px; height: 36px; flex-shrink: 0; }
.site-logo__name { font-family: var(--font-head); font-weight: 700; font-size: 15px; color: var(--color-white); letter-spacing: -0.2px; line-height: 1.1; }
.site-logo__name small { display: block; font-size: 10px; font-weight: 400; color: var(--color-yellow); letter-spacing: 1px; text-transform: uppercase; margin-top: 2px; }

.site-nav { display: flex; align-items: center; gap: 0.25rem; flex-wrap: wrap; }
.site-nav a {
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 13px;
  color: rgba(255,255,255,0.85);
  text-decoration: none;
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius);
  transition: color var(--transition), background-color var(--transition);
}
.site-nav a:hover, .site-nav a.active { color: var(--color-yellow); background-color: rgba(255,255,255,0.05); }

.lang-switch {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-left: 0.5rem;
  padding-left: 1rem;
  border-left: 1px solid rgba(255,255,255,0.2);
}
.lang-switch a {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 11px;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.5);
  padding: 4px 6px;
  border-radius: 3px;
  text-decoration: none;
  transition: color var(--transition);
}
.lang-switch a:hover { color: var(--color-yellow); }
.lang-switch a.active { color: var(--color-yellow); }
.lang-switch .sep { color: rgba(255,255,255,0.25); font-size: 11px; }

/* -------------------------------------------------------------
   6. HERO
   ------------------------------------------------------------- */
.hero {
  background-color: var(--color-yellow);
  padding: 5rem 0 4rem;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle, rgba(0,0,0,0.04) 1px, transparent 1px);
  background-size: 18px 18px;
  pointer-events: none;
}
.hero::after {
  content: '';
  position: absolute;
  width: 220px;
  height: 220px;
  border: 8px solid var(--color-terra);
  border-radius: 50%;
  border-top-color: transparent;
  border-right-color: transparent;
  right: -60px;
  top: -60px;
  transform: rotate(15deg);
  pointer-events: none;
}
.hero__inner { position: relative; z-index: 2; }
.hero__eyebrow {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 3px;
  color: var(--color-dark);
  background-color: rgba(43,43,43,0.08);
  padding: 6px 14px;
  border-radius: 100px;
  display: inline-block;
  margin-bottom: 1.5rem;
}
.hero__title {
  color: var(--color-dark);
  margin-bottom: 1rem;
  max-width: 900px;
}
.hero__title em { color: var(--color-teal); font-style: normal; }
.hero__subtitle {
  font-family: var(--font-body);
  font-size: 1.2rem;
  line-height: 1.55;
  color: var(--color-dark);
  max-width: 720px;
  margin-bottom: 2rem;
}
.hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  align-items: center;
  font-family: var(--font-head);
  font-size: 13px;
  color: var(--color-dark);
}
.hero__meta strong { font-weight: 700; }
.hero__meta .dot { color: var(--color-terra); }

/* -------------------------------------------------------------
   7. BUTTONS
   ------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 13px;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  padding: 0.7rem 1.5rem;
  border-radius: var(--radius);
  border: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
  white-space: nowrap;
  line-height: 1;
}
.btn:hover { transform: translateY(-2px); }
.btn-primary { background-color: var(--color-dark); color: var(--color-white); border-color: var(--color-dark); }
.btn-primary:hover { background-color: var(--color-teal); border-color: var(--color-teal); color: var(--color-white); }
.btn-teal { background-color: var(--color-teal); color: var(--color-white); border-color: var(--color-teal); }
.btn-teal:hover { background-color: var(--color-teal-d); border-color: var(--color-teal-d); color: var(--color-white); }
.btn-outline { background-color: transparent; color: var(--color-dark); border-color: var(--color-dark); }
.btn-outline:hover { background-color: var(--color-dark); color: var(--color-white); }

/* -------------------------------------------------------------
   8. CARDS — NEWS GRID
   ------------------------------------------------------------- */
.news-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.5rem;
}
.news-card {
  background-color: var(--color-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  text-decoration: none;
  color: var(--color-dark);
  transition: box-shadow var(--transition), transform var(--transition);
  position: relative;
  overflow: hidden;
  border-top: 4px solid var(--color-yellow);
}
.news-card::after {
  content: '';
  position: absolute;
  bottom: -40px;
  right: -40px;
  width: 90px;
  height: 90px;
  border: 3px solid var(--color-terra);
  border-radius: 50%;
  border-top-color: transparent;
  opacity: 0.5;
}
.news-card:hover { box-shadow: var(--shadow-hover); transform: translateY(-4px); }
.news-card__tag {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 11px;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--color-terra);
  margin-bottom: 0.75rem;
}
.news-card__title {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.25rem;
  line-height: 1.25;
  margin-bottom: 0.75rem;
  color: var(--color-dark);
}
.news-card__excerpt {
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--color-gray);
  margin-bottom: 1rem;
  flex-grow: 1;
}
.news-card__meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-head);
  font-size: 11px;
  letter-spacing: 0.5px;
  color: var(--color-gray);
  text-transform: uppercase;
  padding-top: 0.75rem;
  border-top: 1px solid var(--color-line);
}
.news-card__arrow { color: var(--color-teal); font-weight: 700; }

/* -------------------------------------------------------------
   9. ARTICLE / NEWS DETAIL
   ------------------------------------------------------------- */
.article {
  background-color: var(--color-white);
  padding: 3.5rem 0;
  min-height: 60vh;
}
.article__inner { max-width: 760px; margin: 0 auto; padding: 0 2rem; }
.article__header { margin-bottom: 2.5rem; padding-bottom: 2rem; border-bottom: 2px dashed var(--color-line); }
.article__breadcrumb {
  font-family: var(--font-head);
  font-size: 12px;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--color-gray);
  margin-bottom: 1rem;
}
.article__breadcrumb a { color: var(--color-gray); text-decoration: none; }
.article__breadcrumb a:hover { color: var(--color-teal); }
.article__title { font-size: clamp(32px, 4vw, 48px); margin-bottom: 1rem; }
.article__lede {
  font-size: 1.2rem;
  line-height: 1.55;
  color: var(--color-dark);
  font-weight: 400;
  margin-bottom: 1.5rem;
}
.article__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  font-family: var(--font-head);
  font-size: 12px;
  letter-spacing: 0.5px;
  color: var(--color-gray);
  text-transform: uppercase;
}
.article__meta span { display: inline-flex; align-items: center; gap: 6px; }
.article__body { font-size: 1.05rem; line-height: 1.8; }
.article__body p { margin-bottom: 1.5rem; max-width: none; }
.article__body h2 { font-size: 1.7rem; margin-top: 2.5rem; margin-bottom: 1rem; }
.article__body h3 { font-size: 1.35rem; margin-top: 2rem; margin-bottom: 0.75rem; }
.article__body ul, .article__body ol { margin: 1rem 0 1.5rem 1.5rem; }
.article__body ul li { list-style: none; padding-left: 1.5rem; position: relative; margin-bottom: 0.5rem; }
.article__body ul li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.75rem;
  width: 8px;
  height: 8px;
  border: 2px solid var(--color-terra);
  border-radius: 50%;
  border-top-color: transparent;
}
.article__body ol li { list-style: decimal; margin-left: 1.5rem; margin-bottom: 0.5rem; }

.sources {
  margin-top: 3rem;
  padding: 2rem;
  background-color: var(--color-light);
  border-radius: var(--radius-lg);
  border-left: 4px solid var(--color-yellow);
}
.sources h3 {
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--color-dark);
  margin-bottom: 1rem;
  margin-top: 0;
}
.sources ul { margin: 0; }
.sources li { margin-bottom: 0.5rem; padding-left: 1.5rem; position: relative; font-size: 0.95rem; list-style: none; }
.sources li::before {
  content: '→';
  position: absolute;
  left: 0;
  top: 0;
  color: var(--color-terra);
  font-weight: 700;
}

/* -------------------------------------------------------------
   10. UPDATE TIMESTAMP / LIVE INDICATOR
   ------------------------------------------------------------- */
.live-indicator {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 11px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--color-dark);
}
.live-indicator__dot {
  width: 10px;
  height: 10px;
  background-color: var(--color-terra);
  border-radius: 50%;
  animation: pulse 1.6s infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(1.3); }
}

/* -------------------------------------------------------------
   11. SECTION HEADERS
   ------------------------------------------------------------- */
.section-header { margin-bottom: 2.5rem; text-align: center; }
.section-header__eyebrow {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 2.5px;
  color: var(--color-terra);
  display: inline-block;
  margin-bottom: 0.75rem;
}
.section-header__title { margin-bottom: 0.75rem; }
.section-header__subtitle { color: var(--color-gray); font-size: 1.05rem; max-width: 640px; margin: 0 auto; }

/* -------------------------------------------------------------
   12. TAGS / TOPIC FILTER
   ------------------------------------------------------------- */
.tags { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-bottom: 2rem; justify-content: center; }
.tag {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 12px;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  padding: 6px 14px;
  border-radius: 100px;
  background-color: var(--color-white);
  color: var(--color-dark);
  border: 2px solid var(--color-line);
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
}
.tag:hover, .tag.active { background-color: var(--color-dark); color: var(--color-yellow); border-color: var(--color-dark); }

/* -------------------------------------------------------------
   13. FOOTER
   ------------------------------------------------------------- */
.site-footer {
  background-color: var(--color-dark);
  color: rgba(255,255,255,0.7);
  padding: 3rem 0 2rem;
  margin-top: 4rem;
  border-top: 4px solid var(--color-yellow);
}
.site-footer__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 2rem;
}
.site-footer h4 {
  font-family: var(--font-head);
  color: var(--color-yellow);
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: 1rem;
}
.site-footer p, .site-footer li { font-size: 14px; line-height: 1.6; color: rgba(255,255,255,0.7); }
.site-footer a { color: rgba(255,255,255,0.7); text-decoration: none; transition: color var(--transition); }
.site-footer a:hover { color: var(--color-yellow); }
.site-footer ul li { margin-bottom: 0.5rem; }
.site-footer__bottom {
  max-width: var(--max-width);
  margin: 2rem auto 0;
  padding: 1.5rem 2rem 0;
  border-top: 1px solid rgba(255,255,255,0.1);
  font-size: 12px;
  color: rgba(255,255,255,0.5);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

/* -------------------------------------------------------------
   14. RESPONSIVE
   ------------------------------------------------------------- */
@media (max-width: 768px) {
  .site-header__inner { height: auto; padding: 12px 1rem; flex-wrap: wrap; }
  .site-nav { font-size: 12px; gap: 0; }
  .site-nav a { padding: 6px 8px; font-size: 12px; }
  .lang-switch { margin-left: auto; padding-left: 0.5rem; }
  .container, .container--narrow { padding: 0 1.25rem; }
  .hero { padding: 3rem 0 2.5rem; }
  .hero__title { font-size: 36px; }
  .hero__subtitle { font-size: 1rem; }
  .site-footer__inner { grid-template-columns: 1fr; }
  .article__inner { padding: 0 1.25rem; }
  section { padding: 2.5rem 0; }
}