/* ==========================================================================
   COMPONENTES — peças reutilizáveis entre seções
   ========================================================================== */

/* HEADER / NAV */
.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 100;
  height: var(--header-h);
  background: var(--header-bg);
  backdrop-filter: saturate(160%) blur(16px);
  -webkit-backdrop-filter: saturate(160%) blur(16px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur) ease;
}

.site-header.is-scrolled {
  border-bottom-color: var(--border);
}

.site-header .container {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--text-lg);
  letter-spacing: -0.03em;
  min-height: 44px;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border-radius: 9px;
  background: var(--ink);
  color: var(--bg);
  font-size: var(--text-sm);
  letter-spacing: -0.04em;
}

.brand-dot {
  color: var(--accent);
}

.nav {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.nav-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding-inline: var(--space-3);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--ink-muted);
  transition: color var(--dur-fast) ease;
}

.nav-link:hover,
.nav-link[aria-current="true"] {
  color: var(--ink);
}

.nav-link::after {
  content: "";
  position: absolute;
  left: var(--space-3);
  right: var(--space-3);
  bottom: 10px;
  height: 2px;
  border-radius: 2px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--dur) var(--ease-out);
}

.nav-link[aria-current="true"]::after {
  transform: scaleX(1);
}

.icon-btn {
  display: inline-grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--border);
  color: var(--ink);
  transition:
    background-color var(--dur-fast) ease,
    border-color var(--dur-fast) ease;
}

.icon-btn:hover {
  background: var(--surface-2);
  border-color: var(--border-strong);
}

.icon-btn svg {
  width: 18px;
  height: 18px;
}

/* Alterna ícones sol/lua conforme o tema efetivo */
.theme-toggle .icon-sun {
  display: none;
}

:root[data-theme="dark"] .theme-toggle .icon-sun {
  display: block;
}

:root[data-theme="dark"] .theme-toggle .icon-moon {
  display: none;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .theme-toggle .icon-sun {
    display: block;
  }

  :root:not([data-theme="light"]) .theme-toggle .icon-moon {
    display: none;
  }
}

.menu-toggle {
  display: none;
}

.menu-toggle .icon-close {
  display: none;
}

.menu-toggle[aria-expanded="true"] .icon-open {
  display: none;
}

.menu-toggle[aria-expanded="true"] .icon-close {
  display: block;
}

@media (max-width: 760px) {
  .menu-toggle {
    display: inline-grid;
  }

  .nav-list {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: var(--space-3) var(--gutter) var(--space-5);
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow);
    visibility: hidden;
    opacity: 0;
    transform: translateY(-8px);
    transition:
      opacity var(--dur) var(--ease-out),
      transform var(--dur) var(--ease-out),
      visibility 0s linear var(--dur);
  }

  .nav-list.is-open {
    visibility: visible;
    opacity: 1;
    transform: none;
    transition-delay: 0s;
  }

  .nav-link {
    width: 100%;
    min-height: 52px;
    font-size: var(--text-lg);
    border-bottom: 1px solid var(--border);
  }

  .nav-list li:last-child .nav-link {
    border-bottom: 0;
  }

  .nav-link::after {
    display: none;
  }
}

/* BOTÕES */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-height: 48px;
  padding: 0 var(--space-5);
  border-radius: var(--radius-pill);
  font-size: var(--text-base);
  font-weight: 600;
  line-height: 1;
  white-space: nowrap;
  transition:
    background-color var(--dur-fast) ease,
    border-color var(--dur-fast) ease,
    color var(--dur-fast) ease,
    transform var(--dur-fast) ease;
}

.btn:active {
  transform: translateY(1px);
}

.btn svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  transition: transform var(--dur) var(--ease-out);
}

.btn:hover svg {
  transform: translate(2px, -2px);
}

.btn-primary {
  background: var(--ink);
  color: var(--bg);
}

.btn-primary:hover {
  background: var(--accent);
  color: var(--on-accent);
}

.btn-ghost {
  border: 1px solid var(--border-strong);
  color: var(--ink);
}

.btn-ghost:hover {
  background: var(--surface);
  border-color: var(--ink-faint);
}

/* RÓTULOS E TAGS */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

.eyebrow-num {
  color: var(--accent);
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.tag {
  display: inline-flex;
  align-items: center;
  padding: 4px 10px;
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  background: var(--surface-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--ink-muted);
  white-space: nowrap;
}

/* CABEÇALHO DE SEÇÃO */
.section-head {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
  gap: var(--space-5) var(--space-8);
  align-items: end;
  margin-bottom: clamp(var(--space-7), 6vw, var(--space-8));
}

.section-head h2 {
  margin-top: var(--space-4);
  font-size: var(--text-3xl);
  font-weight: 800;
  font-stretch: 108%;
}

.section-head p {
  max-width: 46ch;
  color: var(--ink-muted);
  font-size: var(--text-lg);
}

@media (max-width: 760px) {
  .section-head {
    grid-template-columns: 1fr;
  }
}

/* CARD BASE */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
}

/* FOOTER */
.site-footer {
  border-top: 1px solid var(--border);
  padding-block: var(--space-6);
  font-size: var(--text-sm);
  color: var(--ink-faint);
}

.site-footer .container {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-3);
}

.to-top {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  min-height: 44px;
  color: var(--ink-muted);
  transition: color var(--dur-fast) ease;
}

.to-top:hover {
  color: var(--accent);
}

.to-top svg {
  width: 16px;
  height: 16px;
}