/* ============================================================
   main.css — layout, tipografia base, utilitários
   Estética "Blueprint Editorial": grade técnica + tipografia serif
   ============================================================ */

body {
  font-family: var(--font-body);
  font-size: var(--fs-base);
  color: var(--color-ink);
  background: var(--color-bg);
  font-feature-settings: "ss01", "cv11";

  /* Grade de blueprint sutil no fundo global */
  background-image:
    linear-gradient(var(--color-bg-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--color-bg-grid) 1px, transparent 1px);
  background-size: 64px 64px, 64px 64px;
  background-position: -1px -1px;
}

/* ============================================================
   Tipografia
   ============================================================ */

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 400;
  line-height: 1.04;
  letter-spacing: -0.02em;
  color: var(--color-ink);
  font-variation-settings: "SOFT" 30, "WONK" 0, "opsz" 144;
}

h1 { font-size: var(--fs-4xl); }
h2 { font-size: var(--fs-3xl); }
h3 { font-size: var(--fs-xl); }
h4 { font-size: var(--fs-lg); }

h1 em, h2 em, h3 em {
  font-style: italic;
  font-variation-settings: "SOFT" 100, "WONK" 1, "opsz" 144;
  color: var(--color-primary);
}

p {
  font-size: var(--fs-base);
  line-height: 1.65;
  color: var(--color-ink-soft);
  max-width: 62ch;
}

.lede {
  font-size: var(--fs-lg);
  line-height: 1.55;
  color: var(--color-ink);
  max-width: 58ch;
}

/* ============================================================
   Labels técnicos — estilo "etiqueta de blueprint"
   ============================================================ */

.eyebrow,
.label-tech {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--color-ink-faint);
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
}

.eyebrow::before {
  content: "";
  display: inline-block;
  width: 2rem;
  height: 1px;
  background: currentColor;
}

.section-number {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.10em;
  color: var(--color-primary);
}

/* ============================================================
   Container & section
   ============================================================ */

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

section {
  position: relative;
  padding-block: clamp(4rem, 9vw, 8rem);
}

.section-head {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-5);
  margin-bottom: clamp(2.5rem, 5vw, 4rem);
  max-width: 860px;
}

@media (min-width: 768px) {
  .section-head {
    grid-template-columns: auto 1fr;
    column-gap: var(--space-6);
    align-items: baseline;
  }
}

.section-head__meta {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  white-space: nowrap;
  padding-top: 0.4rem;
}

/* ============================================================
   Rule — linha horizontal técnica com anotação
   ============================================================ */

.rule {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  margin-block: var(--space-6);
}
.rule__line {
  flex: 1;
  height: 1px;
  background: var(--color-line);
}
.rule__tag {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-ink-faint);
}

/* ============================================================
   Divisor entre seções — ticks
   ============================================================ */

.section-divider {
  height: 1px;
  background: var(--color-line);
  position: relative;
}
.section-divider::before,
.section-divider::after {
  content: "";
  position: absolute;
  top: -4px;
  width: 1px;
  height: 9px;
  background: var(--color-ink-faint);
}
.section-divider::before { left: var(--gutter); }
.section-divider::after  { right: var(--gutter); }

/* ============================================================
   Botões
   ============================================================ */

.btn {
  --btn-bg: var(--color-ink);
  --btn-fg: var(--color-bg);
  --btn-border: var(--color-ink);
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  padding: 0.95rem 1.4rem;
  background: var(--btn-bg);
  color: var(--btn-fg);
  border: 1px solid var(--btn-border);
  font-family: var(--font-body);
  font-weight: 500;
  font-size: 0.94rem;
  letter-spacing: 0.01em;
  border-radius: var(--r-sm);
  cursor: pointer;
  transition: background var(--dur-fast) var(--ease-out),
              color var(--dur-fast) var(--ease-out),
              transform var(--dur-fast) var(--ease-out),
              box-shadow var(--dur-fast) var(--ease-out);
  position: relative;
  overflow: hidden;
  isolation: isolate;
  will-change: transform;
}
.btn:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}
.btn:active { transform: translateY(0); }

.btn svg { width: 1.05em; height: 1.05em; }

.btn--primary {
  --btn-bg: var(--color-primary);
  --btn-fg: #fff;
  --btn-border: var(--color-primary);
}
.btn--primary:hover {
  --btn-bg: var(--color-primary-deep);
  --btn-border: var(--color-primary-deep);
}

.btn--accent {
  --btn-bg: var(--color-accent);
  --btn-fg: #0A1530;
  --btn-border: var(--color-accent);
}
.btn--accent:hover {
  --btn-bg: var(--color-accent-deep);
  --btn-fg: #fff;
  --btn-border: var(--color-accent-deep);
}

.btn--ghost {
  --btn-bg: transparent;
  --btn-fg: var(--color-ink);
  --btn-border: var(--color-ink);
}
.btn--ghost:hover {
  --btn-bg: var(--color-ink);
  --btn-fg: var(--color-bg);
}

.btn--ghost-light {
  --btn-bg: transparent;
  --btn-fg: #F6F4EE;
  --btn-border: rgba(246, 244, 238, 0.55);
}
.btn--ghost-light:hover {
  --btn-bg: #F6F4EE;
  --btn-fg: var(--color-ink);
  --btn-border: #F6F4EE;
}

/* Link estilizado com seta */
.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-family: var(--font-body);
  font-weight: 500;
  color: var(--color-primary);
  padding-bottom: 0.15rem;
  border-bottom: 1px solid currentColor;
  transition: color var(--dur-fast) var(--ease-out), gap var(--dur-fast) var(--ease-out);
}
.link-arrow:hover {
  color: var(--color-accent-deep);
  gap: 0.85rem;
}
.link-arrow svg { width: 0.95em; height: 0.95em; transition: transform var(--dur-fast); }
.link-arrow:hover svg { transform: translateX(2px); }

/* ============================================================
   Utilitários
   ============================================================ */

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

.is-hidden,
[hidden] { display: none !important; }

.grid { display: grid; }
.flex { display: flex; }
.stack-sm > * + * { margin-top: var(--space-3); }
.stack-md > * + * { margin-top: var(--space-4); }
.stack-lg > * + * { margin-top: var(--space-6); }

/* ============================================================
   Animações on-scroll
   ============================================================ */

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity var(--dur-slow) var(--ease-out),
              transform var(--dur-slow) var(--ease-out);
}
.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}
.reveal[data-delay="1"] { transition-delay: 80ms; }
.reveal[data-delay="2"] { transition-delay: 160ms; }
.reveal[data-delay="3"] { transition-delay: 240ms; }
.reveal[data-delay="4"] { transition-delay: 320ms; }
.reveal[data-delay="5"] { transition-delay: 400ms; }

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; }
}