/* =============================================================
   LAYOUT.CSS — Page structure, Header, Footer, Grid helpers
   ============================================================= */

/* ── Container ── */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--sp-5);
}

.container--narrow {
  max-width: 760px;
  margin-inline: auto;
  padding-inline: var(--sp-5);
}

/* ── Skip link (accessibility) ── */
.skip-link {
  position: fixed;
  top: -100%;
  left: var(--sp-5);
  z-index: 9999;
  padding: var(--sp-2) var(--sp-4);
  background: var(--c-primary);
  color: var(--c-white);
  border-radius: var(--radius-sm);
  font-weight: var(--weight-medium);
  transition: top var(--transition-fast);
}

.skip-link:focus { top: var(--sp-4); }

/* ── Body padding for fixed header ── */
body { padding-top: var(--header-height); }

/* ── ═══════════════════ HEADER ══════════════════════ ── */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--header-height);
  display: flex;
  align-items: center;
  background-color: rgba(250, 248, 243, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--c-border);
  transition:
    transform var(--transition-slow),
    background-color var(--transition-slow),
    border-color var(--transition-slow);
  will-change: transform;
}

/* Hidden state — applied by JS when scrolling down */
.site-header.header--hidden {
  transform: translateY(-100%);
}

/* Scrolled state — slightly more opaque */
.site-header.header--scrolled {
  background-color: rgba(250, 248, 243, 0.97);
  box-shadow: var(--shadow-sm);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-5);
  width: 100%;
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--sp-5);
}

/* ── Logo ── */
.header__logo {
  display: flex;
  flex-direction: column;
  line-height: 1;
  text-decoration: none;
  flex-shrink: 0;
}

.logo__name {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: var(--weight-light);
  color: var(--c-text);
  letter-spacing: 0.02em;
  transition: color var(--transition-fast);
}

.logo__title {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: var(--weight-regular);
  color: var(--c-muted);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-top: 2px;
}

.header__logo:hover .logo__name { color: var(--c-primary); }

/* ── Primary Navigation ── */
.header__nav {
  display: none; /* mobile: hidden, shown via toggle */
}

.nav__list {
  display: flex;
  align-items: center;
  gap: var(--sp-1);
  list-style: none;
  padding: 0;
  margin: 0;
}

.nav__link {
  display: block;
  padding: var(--sp-2) var(--sp-3);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--c-text-2);
  letter-spacing: 0.03em;
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

.nav__link:hover,
.nav__link[aria-current="page"] {
  color: var(--c-primary);
  background-color: rgba(107, 143, 113, 0.08);
}

.nav__link[aria-current="page"] {
  font-weight: var(--weight-semibold);
}

/* ── Header Actions ── */
.header__actions {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  flex-shrink: 0;
}

/* ── Dark Mode Toggle ── */
.btn-theme {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  color: var(--c-text-2);
  transition:
    background-color var(--transition-fast),
    color var(--transition-fast),
    border-color var(--transition-fast);
  flex-shrink: 0;
}

.btn-theme:hover {
  background: var(--c-surface-2);
  color: var(--c-primary);
}

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

/* ── Hamburger (mobile only) ── */
.btn-menu {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  padding: var(--sp-2);
  border-radius: var(--radius-sm);
  flex-shrink: 0;
}

.btn-menu span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--c-text);
  border-radius: var(--radius-full);
  transition: transform var(--transition-base), opacity var(--transition-base);
}

/* Hamburger → X animation */
.btn-menu[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.btn-menu[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}
.btn-menu[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ── Mobile Nav Drawer ── */
.mobile-nav {
  position: fixed;
  inset: 0;
  z-index: 90;
  display: flex;
  flex-direction: column;
  background: var(--c-bg);
  padding: calc(var(--header-height) + var(--sp-6)) var(--sp-6) var(--sp-8);
  transform: translateX(100%);
  transition: transform var(--transition-slower);
  overflow-y: auto;
}

.mobile-nav.is-open {
  transform: translateX(0);
}

.mobile-nav__list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.mobile-nav__link {
  display: block;
  padding: var(--sp-4) 0;
  font-family: var(--font-heading);
  font-size: var(--text-3xl);
  font-weight: var(--weight-light);
  color: var(--c-text);
  border-bottom: 1px solid var(--c-border);
  transition: color var(--transition-fast), padding-left var(--transition-fast);
}

.mobile-nav__link:hover,
.mobile-nav__link[aria-current="page"] {
  color: var(--c-primary);
  padding-left: var(--sp-3);
}

.mobile-nav__cta {
  margin-top: var(--sp-7);
}

/* ── Desktop nav visible ── */
@media (min-width: 900px) {
  .header__nav  { display: flex; }
  .btn-menu     { display: none; }
  .mobile-nav   { display: none !important; }
}

/* ── ═══════════════════ FOOTER ══════════════════════ ── */
.site-footer {
  background: var(--c-surface);
  border-top: 1px solid var(--c-border);
  padding: var(--sp-9) 0 var(--sp-6);
  margin-top: var(--sp-10);
}

.footer__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--sp-8);
  margin-bottom: var(--sp-8);
}

.footer__brand-name {
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  font-weight: var(--weight-light);
  color: var(--c-text);
  margin-bottom: var(--sp-2);
}

.footer__tagline {
  font-size: var(--text-sm);
  color: var(--c-muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: var(--sp-5);
}

.footer__desc {
  font-size: var(--text-sm);
  color: var(--c-text-2);
  line-height: var(--leading-relaxed);
  max-width: 36ch;
}

.footer__heading {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: var(--weight-semibold);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--c-muted);
  margin-bottom: var(--sp-4);
}

.footer__links {
  list-style: none;
  padding: 0;
}

.footer__links li { margin-bottom: var(--sp-3); }

.footer__links a {
  font-size: var(--text-sm);
  color: var(--c-text-2);
  transition: color var(--transition-fast);
}

.footer__links a:hover { color: var(--c-primary); }

.footer__social {
  display: flex;
  gap: var(--sp-3);
  margin-top: var(--sp-5);
}

.social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: var(--radius-full);
  background: var(--c-surface-2);
  color: var(--c-text-2);
  border: 1px solid var(--c-border);
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.social-link:hover {
  background: var(--c-primary);
  color: var(--c-white);
  border-color: var(--c-primary);
}

.social-link svg { width: 16px; height: 16px; }

.footer__bottom {
  padding-top: var(--sp-5);
  border-top: 1px solid var(--c-border);
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-3);
  align-items: center;
  justify-content: space-between;
  font-size: var(--text-xs);
  color: var(--c-muted);
}

.footer__legal {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-4);
}

.footer__legal a {
  color: var(--c-muted);
  transition: color var(--transition-fast);
}

.footer__legal a:hover { color: var(--c-primary); }

@media (min-width: 640px) {
  .footer__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 900px) {
  .footer__grid {
    grid-template-columns: 2fr 1fr 1fr 1fr;
  }
}

/* ── ════════════ SECTION HELPERS ════════════ ── */
.section {
  padding: var(--sp-9) 0;
}

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

.section--lg {
  padding: var(--sp-10) 0;
}

/* Section header pattern */
.section__eyebrow {
  display: inline-block;
  font-size: var(--text-xs);
  font-weight: var(--weight-semibold);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-primary);
  margin-bottom: var(--sp-3);
}

.section__title {
  margin-bottom: var(--sp-4);
}

.section__subtitle {
  font-size: var(--text-lg);
  color: var(--c-text-2);
  line-height: var(--leading-relaxed);
  max-width: 56ch;
}

.section__header { margin-bottom: var(--sp-7); }
.section__header--center { text-align: center; }
.section__header--center .section__subtitle { margin-inline: auto; }

/* ── Grid utilities ── */
.grid-2 {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--sp-6);
}

.grid-3 {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--sp-5);
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--sp-4);
}

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

@media (min-width: 900px) {
  .grid-3 { grid-template-columns: repeat(3, 1fr); }
  .grid-4 { grid-template-columns: repeat(4, 1fr); }
}

/* ── Page hero (inner pages) ── */
.page-hero {
  padding: var(--sp-9) 0 var(--sp-8);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.page-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 50% 80%, rgba(107,143,113,0.08) 0%, transparent 70%);
  pointer-events: none;
}

.page-hero__eyebrow {
  display: inline-block;
  font-size: var(--text-xs);
  font-weight: var(--weight-semibold);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-primary);
  margin-bottom: var(--sp-4);
}

.page-hero__title {
  margin-bottom: var(--sp-5);
}

.page-hero__subtitle {
  font-size: var(--text-lg);
  color: var(--c-text-2);
  max-width: 56ch;
  margin-inline: auto;
  line-height: var(--leading-relaxed);
}

/* ── Divider ── */
.divider {
  width: 48px;
  height: 2px;
  background: linear-gradient(90deg, var(--c-primary), var(--c-accent));
  border-radius: var(--radius-full);
  margin: var(--sp-5) 0;
}

.divider--center { margin-inline: auto; }