/* =========================================================================
   landing.css — Da Correlação à Causalidade
   Estilo dark inspirado em Epidemic Dynamics Lab.
   Escopado em .landing para não afetar páginas internas (capítulos).
   ========================================================================= */

/* Quando a landing está em uso, o body fica dark e a navbar do Quarto some */
body:has(.landing) {
  background: #0a0e1a !important;
  margin: 0;
}
body:has(.landing) .quarto-title-block,
body:has(.landing) #title-block-header,
body:has(.landing) #quarto-header,
body:has(.landing) header.headroom,
body:has(.landing) .navbar,
body:has(.landing) .quarto-secondary-nav,
body:has(.landing) footer.footer,
body:has(.landing) .nav-footer { display: none !important; }

.landing {
  --bg-0: #0a0e1a;
  --bg-1: #121826;
  --bg-2: #1c2436;
  --bg-3: #252e44;

  --text-primary: #f0f4f8;
  --text-secondary: #a8b3c4;
  --text-muted: #6b7a90;

  --border-1: #1e2638;
  --border-2: #2a3449;
  --border-hover: #3a4a68;

  --accent: #00d9c0;
  --accent-soft: #00a98e;
  --accent-dim: rgba(0, 217, 192, 0.15);
  --accent-glow: rgba(0, 217, 192, 0.35);
  --violet: #a78bfa;
  --violet-dim: rgba(167, 139, 250, 0.15);

  --r-sm: 6px;
  --r-md: 10px;
  --r-lg: 16px;

  --shadow-1: 0 4px 14px rgba(0, 0, 0, .35);
  --shadow-accent: 0 0 0 3px var(--accent-glow);

  --maxw: 1200px;
  --t-fast: 120ms ease;
  --t-med:  220ms ease;

  font-family: 'Inter', system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  color: var(--text-primary);
  background: var(--bg-0);
  line-height: 1.55;
  min-height: 100vh;
  width: 100%;
}

.landing * { box-sizing: border-box; }
.landing a { text-decoration: none; }

.landing h1, .landing h2, .landing h3 {
  margin: 0 0 .5em 0;
  color: var(--text-primary);
  font-weight: 700;
  line-height: 1.2;
}

/* ---------- Hero ----------------------------------------------------- */
.landing .hero {
  position: relative;
  padding: clamp(4rem, 10vw, 7rem) clamp(1.2rem, 5vw, 3rem) clamp(3rem, 8vw, 5.5rem);
  overflow: hidden;
  border-bottom: 1px solid var(--border-1);
  background:
    radial-gradient(1200px 500px at 20% -20%, rgba(0, 217, 192, 0.12), transparent 60%),
    radial-gradient(800px 400px at 85% -10%, rgba(167, 139, 250, 0.10), transparent 60%),
    linear-gradient(180deg, #0b1020 0%, var(--bg-0) 100%);
}

.landing .hero-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: .9;
}

.landing .hero-pattern {
  position: absolute;
  left: 0; right: 0; bottom: -1rem;
  width: 100%;
  height: 70%;
}

.landing .hero-content {
  position: relative;
  max-width: var(--maxw);
  margin: 0 auto;
  text-align: center;
}

.landing .hero-eyebrow {
  display: inline-block;
  padding: 6px 14px;
  border: 1px solid var(--border-2);
  border-radius: 999px;
  font-size: .78rem;
  text-transform: uppercase;
  letter-spacing: .12em;
  color: var(--text-secondary);
  background: rgba(255, 255, 255, 0.02);
  margin-bottom: 1.5rem;
}

.landing .hero-title {
  font-size: clamp(2.4rem, 6vw, 4.25rem);
  font-weight: 800;
  letter-spacing: -.025em;
  margin-bottom: .5rem;
  line-height: 1.05;
  color: var(--text-primary);
}

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

.landing .hero-subtitle {
  max-width: 760px;
  margin: .75rem auto 2.25rem auto;
  font-size: clamp(1rem, 1.4vw, 1.15rem);
  color: var(--text-secondary);
  line-height: 1.65;
}

.landing .hero-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* ---------- Botões --------------------------------------------------- */
.landing .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5em;
  padding: .72em 1.3em;
  border-radius: var(--r-md);
  border: 1px solid transparent;
  background: var(--bg-2);
  color: var(--text-primary);
  font-weight: 500;
  font-size: .98rem;
  cursor: pointer;
  transition: transform var(--t-fast), background var(--t-fast),
              border-color var(--t-fast), box-shadow var(--t-fast);
  text-decoration: none;
}

.landing .btn:hover { transform: translateY(-1px); }
.landing .btn:active { transform: translateY(0); }
.landing .btn:focus-visible { outline: none; box-shadow: var(--shadow-accent); }

.landing .btn-primary {
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-soft) 100%);
  color: #0a1a17 !important;
  font-weight: 600;
}
.landing .btn-primary:hover {
  box-shadow: 0 8px 20px var(--accent-glow);
}

.landing .btn-ghost {
  background: transparent;
  border-color: var(--border-2);
  color: var(--text-primary) !important;
}
.landing .btn-ghost:hover {
  border-color: var(--border-hover);
  background: var(--bg-1);
}

/* ---------- Seções --------------------------------------------------- */
.landing .modules-section {
  padding: clamp(3rem, 6vw, 5rem) clamp(1.2rem, 5vw, 3rem);
  max-width: var(--maxw);
  margin: 0 auto;
  width: 100%;
}

.landing .section-header {
  margin-bottom: 2.25rem;
  text-align: left;
  border-bottom: 1px solid var(--border-1);
  padding-bottom: .75rem;
}

.landing .section-title {
  font-size: clamp(1.4rem, 2vw, 1.75rem);
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--text-primary);
  margin: 0;
}

/* ---------- Grid de cards ------------------------------------------- */
.landing .modules-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.25rem;
}

.landing .module-card {
  position: relative;
  display: flex;
  flex-direction: column;
  background: var(--bg-1);
  border: 1px solid var(--border-1);
  border-radius: var(--r-lg);
  padding: 1.5rem 1.4rem 1.4rem 1.4rem;
  text-decoration: none;
  color: inherit;
  cursor: pointer;
  transition: border-color var(--t-med), background var(--t-med),
              transform var(--t-med), box-shadow var(--t-med);
  min-height: 170px;
}

.landing .module-card:hover {
  border-color: var(--border-hover);
  background: var(--bg-2);
  transform: translateY(-2px);
  box-shadow: var(--shadow-1);
}

.landing .module-card:focus-visible {
  outline: none;
  box-shadow: var(--shadow-accent);
}

.landing .module-card-number,
.landing .module-card-letter {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  background: var(--accent-dim);
  color: var(--accent);
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: .82rem;
  font-weight: 600;
  margin-bottom: 1rem;
}

.landing .module-card-letter {
  background: var(--violet-dim);
  color: var(--violet);
}

.landing .module-card-title {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-primary);
  margin: 0 0 .4rem 0;
  line-height: 1.3;
}

.landing .module-card-subtitle {
  font-size: .88rem;
  color: var(--text-secondary);
  line-height: 1.5;
  margin: 0;
}

/* ---------- Apoio (links pequenos, em vez de cards) ----------------- */
.landing .apoio-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1rem;
}

.landing .apoio-link {
  display: flex;
  flex-direction: column;
  gap: .25rem;
  padding: 1rem 1.2rem;
  background: transparent;
  border: 1px solid var(--border-1);
  border-radius: var(--r-md);
  color: var(--text-primary);
  text-decoration: none;
  transition: border-color var(--t-fast), background var(--t-fast);
}

.landing .apoio-link:hover {
  border-color: var(--accent);
  background: var(--bg-1);
}

.landing .apoio-link-label {
  font-weight: 600;
  font-size: .98rem;
  color: var(--text-primary);
}

.landing .apoio-link-meta {
  font-size: .82rem;
  color: var(--text-muted);
}

/* ---------- Footer (minimalista, uma linha) ------------------------- */
.landing .landing-footer {
  border-top: 1px solid var(--border-1);
  padding: 1.5rem clamp(1.2rem, 5vw, 3rem);
  margin-top: 2rem;
  background: #07090f;
  text-align: center;
}

.landing .landing-footer-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  font-size: .82rem;
  color: var(--text-muted);
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  flex-wrap: wrap;
  justify-content: center;
}

.landing .landing-footer-inner a {
  color: var(--text-secondary);
  border-bottom: 1px solid transparent;
  transition: color var(--t-fast), border-color var(--t-fast);
}
.landing .landing-footer-inner a:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.landing .landing-footer-inner sup {
  font-size: .65em;
  margin-left: 1px;
  opacity: .8;
}

.landing .footer-sep {
  opacity: .4;
}

/* ---------- Responsivo ---------------------------------------------- */
@media (max-width: 600px) {
  .landing .modules-grid,
  .landing .apoio-grid {
    grid-template-columns: 1fr;
  }
  .landing .landing-footer-inner {
    justify-content: center;
    text-align: center;
  }
}