/* ==========================================================================
   EquiPay · Layout: cabecera, navegación, secciones y pie de página.
   ========================================================================== */

/* ---------- Cabecera ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  height: var(--header-h);
  background: rgb(255 255 255 / 0.85);
  backdrop-filter: saturate(160%) blur(12px);
  -webkit-backdrop-filter: saturate(160%) blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s, box-shadow 0.3s;
}

.site-header.is-scrolled {
  border-bottom-color: var(--neutral-100);
  box-shadow: var(--shadow-sm);
}

.site-header__inner {
  display: flex;
  align-items: center;
  gap: 24px;
  height: 100%;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  flex-shrink: 0;
}

.brand__mark {
  height: 36px;
  width: auto;
}

.brand__text {
  line-height: 1;
}

.brand__name {
  display: block;
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--primary-700);
}

.brand__tag {
  display: block;
  margin-top: 3px;
  font-size: 0.66rem;
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--neutral-600);
}

.brand--light .brand__name {
  color: var(--white);
}

.brand--light .brand__tag {
  color: var(--primary-200);
}

.nav {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: auto;
}

.nav__link {
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  font-size: 0.94rem;
  font-weight: 500;
  color: var(--neutral-700);
  text-decoration: none;
  white-space: nowrap;
  transition: background 0.2s, color 0.2s;
}

.nav__link:hover {
  background: var(--primary-50);
  color: var(--primary-700);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.menu-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border: 1px solid var(--neutral-200);
  border-radius: var(--radius-sm);
  background: var(--white);
  cursor: pointer;
}

.menu-toggle__bars,
.menu-toggle__bars::before,
.menu-toggle__bars::after {
  display: block;
  width: 18px;
  height: 2px;
  border-radius: 2px;
  background: var(--primary-700);
  transition: transform 0.3s var(--ease), opacity 0.2s;
}

.menu-toggle__bars {
  position: relative;
}

.menu-toggle__bars::before,
.menu-toggle__bars::after {
  content: '';
  position: absolute;
  left: 0;
}

.menu-toggle__bars::before {
  top: -6px;
}

.menu-toggle__bars::after {
  top: 6px;
}

.menu-toggle[aria-expanded='true'] .menu-toggle__bars {
  background: transparent;
}

.menu-toggle[aria-expanded='true'] .menu-toggle__bars::before {
  transform: translateY(6px) rotate(45deg);
}

.menu-toggle[aria-expanded='true'] .menu-toggle__bars::after {
  transform: translateY(-6px) rotate(-45deg);
}

@media (max-width: 1280px) {
  .nav__link--secondary {
    display: none;
  }
}

@media (max-width: 920px) {
  .menu-toggle {
    display: inline-flex;
  }

  .nav {
    position: fixed;
    inset: var(--header-h) 0 auto 0;
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    margin: 0;
    padding: 12px var(--gutter) 20px;
    background: var(--white);
    border-bottom: 1px solid var(--neutral-100);
    box-shadow: var(--shadow);
    transform: translateY(-8px);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.25s, transform 0.25s var(--ease), visibility 0.25s;
  }

  .nav.is-open {
    transform: none;
    opacity: 1;
    visibility: visible;
  }

  .nav__link,
  .nav__link--secondary {
    display: block;
    padding: 12px;
    font-size: 1rem;
  }

  .header-actions {
    margin-left: auto;
  }

  .header-actions .btn--login {
    display: none;
  }
}

@media (max-width: 480px) {
  .header-actions .btn--demo {
    display: none;
  }
}

/* ---------- Secciones ---------- */
.section {
  padding-block: clamp(64px, 9vw, 112px);
}

.section--surface {
  background: var(--surface);
}

.section--cream {
  background: var(--cream);
}

.section--dark {
  position: relative;
  overflow: hidden;
  background: var(--primary-700);
  color: var(--primary-100);
}

.section--dark h2,
.section--dark h3 {
  color: var(--white);
}

.section-head {
  max-width: 720px;
  margin-bottom: clamp(36px, 5vw, 56px);
}

.section-head--center {
  margin-inline: auto;
  text-align: center;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 14px;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--secondary-600);
}

.eyebrow::before {
  content: '';
  width: 18px;
  height: 2px;
  border-radius: 2px;
  background: var(--tertiary-500);
}

.section--dark .eyebrow {
  color: var(--secondary-300);
}

.section-title {
  font-size: clamp(1.8rem, 3.6vw, 2.6rem);
  font-weight: 800;
}

.section-lead {
  margin-top: 16px;
  font-size: clamp(1rem, 1.4vw, 1.12rem);
  color: var(--neutral-600);
}

.section--dark .section-lead {
  color: var(--primary-100);
}

.grid {
  display: grid;
  gap: 20px;
}

.grid > * {
  min-width: 0;
}

.grid--2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.grid--3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.grid--4 {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

@media (max-width: 960px) {
  .grid--3,
  .grid--4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  .grid--2,
  .grid--3,
  .grid--4 {
    grid-template-columns: 1fr;
  }
}

/* ---------- Pie de página ---------- */
.site-footer {
  position: relative;
  overflow: hidden;
  background: var(--primary-900);
  color: var(--primary-200);
  font-size: 0.94rem;
}

.site-footer__top {
  display: grid;
  grid-template-columns: 1.4fr repeat(3, 1fr);
  gap: 40px;
  padding-block: 64px 48px;
}

.site-footer__about p {
  max-width: 340px;
  margin-top: 16px;
  color: var(--primary-200);
}

.site-footer h3 {
  margin-bottom: 14px;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--white);
}

.site-footer li + li {
  margin-top: 10px;
}

.site-footer a {
  color: var(--primary-200);
  text-decoration: none;
  transition: color 0.2s;
}

.site-footer a:hover {
  color: var(--white);
}

.site-footer__bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-block: 24px;
  border-top: 1px solid rgb(171 204 210 / 0.15);
  font-size: 0.86rem;
}

.site-footer__disclaimer {
  padding-bottom: 28px;
  font-size: 0.8rem;
  color: var(--primary-300);
}

/* Créditos del autor */
.credits {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 6px 14px 6px 6px;
  border: 1px solid rgb(201 162 39 / 0.35);
  border-radius: 999px;
  background: rgb(201 162 39 / 0.08);
  color: var(--primary-100);
}

.credits__avatar {
  display: inline-grid;
  place-items: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--tertiary-400), var(--tertiary-600));
  color: var(--primary-900);
  font-size: 0.8rem;
  font-weight: 800;
}

.credits__name {
  font-weight: 700;
  color: var(--tertiary-300);
}

a.credits__name:hover {
  color: var(--tertiary-200);
}

@media (max-width: 860px) {
  .site-footer__top {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .site-footer__about {
    grid-column: 1 / -1;
  }
}

@media (max-width: 480px) {
  .site-footer__top {
    grid-template-columns: 1fr;
  }
}