/* ============================================================
   Forge — Design System Foundation
   Carico PRIMA di styles.css. Non sovrascrive lo stato esistente:
   aggiunge solo nuove variabili e la utility .container per i
   blocchi desktop cinematici dei prossimi step.
   ============================================================ */

/* ---------- 1.1 Palette ---------- */
:root {
  /* Base */
  --cream:        #FAF9F6;
  --cream-deep:   #F2EFE8;
  --ink:          #1A3034;
  --ink-soft:     #4A5C5F;
  --ink-light:    #8B9799;

  /* Brand */
  --forge-teal:       #0D7C6B;
  --forge-teal-deep:  #085041;
  --forge-teal-light: #4DA593;

  /* Accent */
  --forge-electric: #00FFC2;
  --forge-mint:     #D4F4ED;

  /* UI */
  --border-soft:     rgba(26, 48, 52, 0.08);
  --border-medium:   rgba(26, 48, 52, 0.15);
  --shadow-soft:     0 4px 24px rgba(26, 48, 52, 0.06);
  --shadow-elevated: 0 12px 48px rgba(26, 48, 52, 0.12);
  --shadow-floating: 0 24px 64px rgba(26, 48, 52, 0.15);

  /* Glass */
  --glass-bg:   rgba(250, 249, 246, 0.85);
  --glass-blur: blur(12px);
}

/* ---------- 1.2 Typography (responsive via clamp) ---------- */
:root {
  --text-display-xl: clamp(2.5rem, 5vw, 5rem);
  --text-display-lg: clamp(2rem, 4vw, 4rem);

  --text-h1: clamp(1.75rem, 3vw, 3rem);
  --text-h2: clamp(1.5rem, 2.5vw, 2.5rem);
  --text-h3: clamp(1.25rem, 1.8vw, 1.75rem);

  --text-body-lg: clamp(1rem, 1.2vw, 1.25rem);
  --text-body:    clamp(0.875rem, 1vw, 1rem);
  --text-small:   clamp(0.75rem, 0.85vw, 0.875rem);

  --leading-tight:   1.1;
  --leading-snug:    1.3;
  --leading-normal:  1.5;
  --leading-relaxed: 1.7;

  --tracking-tight:  -0.02em;
  --tracking-normal: 0;
  --tracking-wide:   0.05em;
}

/* ---------- 1.3 Spacing system ---------- */
:root {
  --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: 6rem;
  --space-5xl: 8rem;

  --section-padding-y-mobile:  3rem;
  --section-padding-y-tablet:  5rem;
  --section-padding-y-desktop: 8rem;

  --container-narrow:  720px;
  --container-default: 1024px;
  --container-wide:    1280px;
  --container-full:    1440px;
}

/* ---------- 1.4 Container utility ---------- */
.container {
  width: 100%;
  margin: 0 auto;
  padding-left: var(--space-md);
  padding-right: var(--space-md);
}

@media (min-width: 768px) {
  .container {
    padding-left: var(--space-2xl);
    padding-right: var(--space-2xl);
  }
}

@media (min-width: 1024px) {
  .container {
    max-width: var(--container-default);
    padding-left: var(--space-3xl);
    padding-right: var(--space-3xl);
  }
}

@media (min-width: 1440px) {
  .container {
    max-width: var(--container-wide);
  }
}

/* ---------- 1.5 Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ============================================================
   Step 3 — Navbar cinematico (desktop only, ≥1024px)
   Attivo SOLO quando la landing (#screen-intro) è visibile.
   Su privacy/terms/about/result l'header conserva il glass di
   styles.css. Mobile + tablet: nessuna regola → intatti.
   ============================================================ */
@media (min-width: 1024px) {
  body.screen-intro-active .global-header {
    background: transparent;
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    border-bottom: none;
    box-shadow: none;
    padding-top: 24px;
    padding-bottom: 24px;
    transition:
      background 0.4s cubic-bezier(0.4, 0, 0.2, 1),
      backdrop-filter 0.4s cubic-bezier(0.4, 0, 0.2, 1),
      border-color 0.4s cubic-bezier(0.4, 0, 0.2, 1),
      box-shadow 0.4s cubic-bezier(0.4, 0, 0.2, 1),
      padding 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  }

  body.screen-intro-active .global-header.navbar-scrolled {
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border-bottom: 1px solid var(--border-soft);
    box-shadow: var(--shadow-soft);
    padding-top: 16px;
    padding-bottom: 16px;
  }

  body.screen-intro-active .logo {
    color: var(--ink);
  }
}

/* ---------- Lang toggle thumb (desktop only, tutte le screens) ---------- */
.lang-toggle-thumb {
  display: none;
}

@media (min-width: 1024px) {
  .lang-toggle {
    position: relative;
    padding: 4px;
    border-radius: 999px;
    background: transparent;
    transition: background 0.3s ease;
  }

  body.screen-intro-active .global-header.navbar-scrolled .lang-toggle {
    background: rgba(26, 48, 52, 0.04);
  }

  .lang-toggle .lang-opt {
    position: relative;
    z-index: 1;
    padding: 4px 12px;
    border-radius: 999px;
  }

  .lang-toggle-thumb {
    display: block;
    position: absolute;
    top: 4px;
    left: 4px;
    width: calc(50% - 4px);
    height: calc(100% - 8px);
    background: var(--cream);
    border: 1px solid var(--border-soft);
    border-radius: 999px;
    box-shadow: var(--shadow-soft);
    z-index: 0;
    pointer-events: none;
  }

  .lang-toggle .lang-sep {
    display: none;
  }
}

/* ============================================================
   Step 4 — Hero cinematica (desktop only, ≥1024px)
   Mobile: nessuna regola. Desktop: allarga il contenitore a
   900px, flex-center verticale, padding 120/80, underline SVG
   dell'headline. L'animazione d'entrata è pilotata da JS.
   ============================================================ */
/* === Enfasi sulla frase chiave dell'hero ===
   Trattamento minimale: italic + teal + weight 600. Nessun box, nessuna
   underline, nessuna decorazione. La parola chiave si distingue solo
   per stile tipografico. */
.hero-emphasis {
  font-style: italic;
  font-weight: 600;
  color: var(--forge-teal, #0D7C6B);
}

/* Piccolo respiro verticale all'intera headline per eventuali ascendenti/
   discendenti italic che escono dal line-box stretto di un h1 900 weight. */
.intro-headline {
  padding-bottom: 0.08em;
}

/* Fase 2 — hero "full fold": da ≥768px l'hero occupa esattamente la
   viewport meno la navbar fissa (52px), con contenuto centrato
   verticalmente. Su mobile (<768px) resta altezza auto perché il
   testo verboso rischia overflow su schermi corti (iPhone SE 667px). */
@media (min-width: 768px) {
  body.screen-intro-active #screen-intro .intro-content,
  #screen-intro .intro-content {
    min-height: calc(100vh - 52px);
    justify-content: center;
    padding-top: 72px;
    padding-bottom: 48px;
  }
}

@media (min-width: 1024px) {
  body.screen-intro-active #screen-intro .intro-content {
    max-width: 900px;
    min-height: calc(100vh - 52px);
    padding-top: 120px;
    padding-bottom: 80px;
    padding-left: 64px;
    padding-right: 64px;
    justify-content: center;
    text-align: center;
  }

  body.screen-intro-active .intro-eyebrow {
    letter-spacing: 1.8px;
  }

  /* Previeni FOUC: le parole della headline partono invisibili mentre
     JS ci lavora sopra. Se JS non gira (CDN fail), fallback a visibili. */
  body.screen-intro-active .intro-headline .hero-word {
    will-change: transform;
  }

  /* Scroll arrow: bounce loop */
  body.screen-intro-active .hero-scroll-arrow {
    animation: forgeScrollBounce 2.2s ease-in-out infinite;
  }

  @keyframes forgeScrollBounce {
    0%, 100% { transform: translateY(0); }
    50%      { transform: translateY(6px); }
  }
}

/* ============================================================
   Step 5 — How It Works cards (desktop only, ≥1024px)
   Il layout 4-colonne a ≥1024 è già in styles.css. Qui
   aggiungiamo solo il design system visivo: card con border +
   radius, numero "01-04" in colore soft + grande, hover lift.
   ============================================================ */
@media (min-width: 1024px) {
  #how-it-works .hiw-card {
    background: var(--cream);
    border: 1px solid var(--border-soft);
    border-radius: 16px;
    transition:
      transform 0.4s cubic-bezier(0.4, 0, 0.2, 1),
      box-shadow 0.4s cubic-bezier(0.4, 0, 0.2, 1),
      border-color 0.4s ease;
  }

  #how-it-works .hiw-num {
    color: var(--ink-light);
    font-size: clamp(4rem, 6vw, 6rem);
    line-height: 1;
    margin: 0 0 20px;
    transition: color 0.4s ease, transform 0.4s ease;
  }

  #how-it-works .hiw-title {
    font-size: var(--text-h3);
    color: var(--ink);
    font-weight: 600;
  }

  #how-it-works .hiw-body {
    font-size: var(--text-body);
    color: var(--ink-soft);
    line-height: var(--leading-normal);
  }
}

@media (hover: hover) and (min-width: 1024px) {
  #how-it-works .hiw-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-elevated);
    border-color: var(--forge-teal-light);
  }

  #how-it-works .hiw-card:hover .hiw-num {
    color: var(--forge-teal);
    transform: scale(1.05);
  }
}

/* ============================================================
   FourLayers — griglia 2x2 statica
   Sezione standard: 4 card visibili insieme con hover CSS-only.
   Entry animation via GSAP (stagger) in animations.js.
   ============================================================ */
.four-layers-grid {
  padding: var(--section-padding-y-mobile) var(--space-md);
  background: var(--cream-deep);
  position: relative;
}

@media (min-width: 768px) {
  .four-layers-grid {
    padding: var(--section-padding-y-tablet) var(--space-2xl);
  }
}

@media (min-width: 1024px) {
  .four-layers-grid {
    padding: var(--section-padding-y-desktop) var(--space-3xl);
  }
}

/* Header della sezione */
.four-layers-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto var(--space-3xl);
}

.four-layers-header .section-label {
  display: inline-block;
  font-size: var(--text-small);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--forge-teal);
  margin-bottom: var(--space-md);
}

.four-layers-header h2 {
  font-family: 'Outfit', 'Inter', system-ui, sans-serif;
  font-size: var(--text-h1);
  color: var(--ink);
  margin-bottom: var(--space-md);
  font-weight: 700;
  line-height: var(--leading-tight);
}

.four-layers-header .section-subtitle {
  font-size: var(--text-body-lg);
  color: var(--ink-soft);
  line-height: var(--leading-normal);
  margin: 0;
}

/* Griglia: 1 col mobile, 2 col tablet+ */
.four-layers-cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
  max-width: 1000px;
  margin: 0 auto;
}

@media (min-width: 768px) {
  .four-layers-cards {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-xl);
  }
}

@media (min-width: 1024px) {
  .four-layers-cards {
    gap: var(--space-2xl);
  }
}

/* Singola card */
.layer-card-v2 {
  background: var(--cream);
  border: 1px solid var(--border-soft);
  border-radius: 20px;
  padding: var(--space-xl);
  transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1),
              box-shadow 0.4s cubic-bezier(0.4, 0, 0.2, 1),
              border-color 0.4s ease;
}

@media (min-width: 1024px) {
  .layer-card-v2 {
    padding: var(--space-2xl);
    min-height: 320px;
    display: flex;
    flex-direction: column;
  }
}

/* Hover: lift + border teal + shadow soft */
@media (hover: hover) {
  .layer-card-v2:hover {
    transform: translateY(-4px);
    border-color: var(--forge-teal);
    box-shadow: 0 12px 32px rgba(13, 124, 107, 0.08);
  }

  .layer-card-v2:hover .card-number {
    color: var(--forge-teal);
  }
}

.layer-card-v2 .card-number {
  font-family: 'Outfit', 'Inter', system-ui, sans-serif;
  font-size: clamp(2.5rem, 4vw, 3.75rem);
  font-weight: 800;
  color: var(--ink-light);
  line-height: 1;
  margin-bottom: var(--space-md);
  transition: color 0.4s ease;
  letter-spacing: -0.02em;
}

.layer-card-v2 .card-icon {
  font-size: 2.5rem;
  margin-bottom: var(--space-md);
  display: inline-block;
  line-height: 1;
}

.layer-card-v2 h3 {
  font-family: 'Outfit', 'Inter', system-ui, sans-serif;
  font-size: var(--text-h3);
  color: var(--ink);
  margin-bottom: var(--space-md);
  font-weight: 700;
  line-height: var(--leading-snug);
}

.layer-card-v2 .card-description {
  font-size: var(--text-body-lg);
  color: var(--ink-soft);
  line-height: var(--leading-normal);
  margin: 0;
}

/* Caption finale */
.four-layers-caption {
  text-align: center;
  max-width: 600px;
  margin: var(--space-3xl) auto 0;
  font-size: var(--text-h3);
  color: var(--forge-teal);
  font-weight: 600;
  font-style: italic;
  line-height: var(--leading-snug);
  padding: 0 var(--space-md);
}

@media (max-width: 767px) {
  .four-layers-caption {
    margin-top: var(--space-2xl);
  }
}

/* ============================================================
   Step 7 — TeamOutput / LinkedIn mockup (desktop polish)
   Il markup .li-post/.li-bar-fill/.li-co-bar è preesistente e
   integro. Qui aggiungiamo solo:
   - transform-origin left per le bar (animazione via JS)
   - will-change sul wrap per il parallax mouse-move
   L'entry animation + counter + parallax vivono in animations.js.
   ============================================================ */
@media (min-width: 1024px) {
  body.screen-intro-active .li-post-wrap {
    will-change: transform;
  }

  body.screen-intro-active .li-post .li-bar-fill,
  body.screen-intro-active .li-post .li-co-bar > div {
    transform-origin: left center;
  }
}

/* Override FASE 1 rimosso in Fase 2 — FourLayers e LinkedIn mockup
   tornano al comportamento originale: .four-layers display:block solo
   desktop con body.screen-intro-active (swap con .requires-section),
   .li-post-section visibile su tutti i breakpoint. */

/* Sezione Founders rimossa dalla landing (le stringhe i18n
   founders.heading/text restano in app.js per uso futuro). */

/* ============================================================
   Timeline — step che si illuminano scrollando
   Layout verticale con 5 step. Ogni step ha un marker (numero in
   cerchio + linea connettrice) e un content (when/title/text).
   Stato "spento" (default): numero vuoto, testo sbiadito.
   Stato "attivo" (.is-active): numero teal pieno, testo ink,
   linea connettrice riempita. Trigger via ScrollTrigger in
   animations.js. Reduced-motion: tutto attivo subito.
   ============================================================ */
.timeline-section {
  padding: var(--section-padding-y-mobile) var(--space-md);
  background: var(--cream);
  position: relative;
}

@media (min-width: 768px) {
  .timeline-section {
    padding: var(--section-padding-y-tablet) var(--space-2xl);
  }
}

@media (min-width: 1024px) {
  .timeline-section {
    padding: var(--section-padding-y-desktop) var(--space-3xl);
  }
}

.timeline-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto var(--space-3xl);
}

.timeline-header .section-label {
  display: inline-block;
  font-size: var(--text-small);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--forge-teal);
  margin-bottom: var(--space-md);
}

.timeline-header h2 {
  font-family: 'Outfit', 'Inter', system-ui, sans-serif;
  font-size: var(--text-h1);
  color: var(--ink);
  margin-bottom: var(--space-md);
  font-weight: 700;
  line-height: var(--leading-tight);
}

.timeline-header .section-subtitle {
  font-size: var(--text-body-lg);
  color: var(--ink-soft);
  line-height: var(--leading-normal);
  margin: 0;
}

/* Container degli step */
.timeline-steps {
  max-width: 700px;
  margin: 0 auto;
  position: relative;
}

.timeline-step {
  display: flex;
  align-items: flex-start;
  gap: var(--space-lg);
  padding-bottom: var(--space-2xl);
  position: relative;
}
.timeline-step:last-child { padding-bottom: 0; }

@media (max-width: 767px) {
  .timeline-step {
    padding-bottom: var(--space-xl);
    gap: var(--space-md);
  }
}

/* Marker = numero in cerchio + linea connettrice verticale */
.timeline-step-marker {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  flex-shrink: 0;
}

.timeline-step-number {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: 2px solid var(--border-soft);
  background: var(--cream);
  color: var(--ink-light);
  font-family: 'Outfit', 'Inter', system-ui, sans-serif;
  font-weight: 700;
  font-size: 1.125rem;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2;
  position: relative;
  transition: background 0.5s cubic-bezier(0.4, 0, 0.2, 1),
              border-color 0.5s cubic-bezier(0.4, 0, 0.2, 1),
              color 0.5s cubic-bezier(0.4, 0, 0.2, 1),
              box-shadow 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

@media (min-width: 768px) {
  .timeline-step-number {
    width: 56px;
    height: 56px;
    font-size: 1.25rem;
  }
}

/* Linea connettrice tra step (solo sugli step non-ultimi) */
.timeline-step-line {
  position: absolute;
  top: 48px;
  left: 50%;
  transform: translateX(-50%);
  width: 2px;
  height: calc(100% + var(--space-2xl) - 48px);
  background: var(--border-soft);
  z-index: 1;
  overflow: hidden;
}

@media (min-width: 768px) {
  .timeline-step-line {
    top: 56px;
    height: calc(100% + var(--space-2xl) - 56px);
  }
}

@media (max-width: 767px) {
  .timeline-step-line {
    height: calc(100% + var(--space-xl) - 48px);
  }
}

/* Fill teal che cresce quando lo step è attivo */
.timeline-step-line::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 0;
  background: var(--forge-teal);
  transition: height 0.6s cubic-bezier(0.4, 0, 0.2, 1) 0.2s;
}

/* Contenuto testuale */
.timeline-step-content {
  flex: 1;
  padding-top: var(--space-xs);
}

.timeline-step-when {
  display: inline-block;
  font-size: var(--text-small);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-light);
  margin-bottom: var(--space-xs);
  transition: color 0.5s ease;
}

.timeline-step-title {
  font-family: 'Outfit', 'Inter', system-ui, sans-serif;
  font-size: var(--text-h3);
  color: var(--ink-soft);
  font-weight: 700;
  margin: 0 0 var(--space-xs);
  line-height: var(--leading-snug);
  transition: color 0.5s ease;
}

.timeline-step-text {
  font-size: var(--text-body);
  color: var(--ink-light);
  line-height: var(--leading-normal);
  margin: 0;
  transition: color 0.5s ease;
}

/* === Stato attivato === */
.timeline-step.is-active .timeline-step-number {
  background: var(--forge-teal);
  border-color: var(--forge-teal);
  color: #ffffff;
  box-shadow: 0 0 0 6px rgba(13, 124, 107, 0.1);
}

.timeline-step.is-active .timeline-step-line::before {
  height: 100%;
}

.timeline-step.is-active .timeline-step-when {
  color: var(--forge-teal);
}

.timeline-step.is-active .timeline-step-title {
  color: var(--ink);
}

.timeline-step.is-active .timeline-step-text {
  color: var(--ink-soft);
}

/* Reduced motion: tutti gli step appaiono subito attivi, nessuna
   transizione (evita crescita line + fade testi per utenti sensibili). */
@media (prefers-reduced-motion: reduce) {
  .timeline-step-number,
  .timeline-step-line::before,
  .timeline-step-when,
  .timeline-step-title,
  .timeline-step-text {
    transition: none !important;
  }
  .timeline-step .timeline-step-number {
    background: var(--forge-teal);
    border-color: var(--forge-teal);
    color: #ffffff;
  }
  .timeline-step .timeline-step-line::before { height: 100%; }
  .timeline-step .timeline-step-when { color: var(--forge-teal); }
  .timeline-step .timeline-step-title { color: var(--ink); }
  .timeline-step .timeline-step-text { color: var(--ink-soft); }
}