/* =========================================================
   ARPOZAN Products — core.css
   Header, footer, buttons, eyebrow — shared across all pages
   ========================================================= */

/* ====== Header ====== */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 50;
  padding: var(--space-5) clamp(var(--space-5), 3vw, var(--space-10));
  backdrop-filter: blur(18px) saturate(1.2);
  -webkit-backdrop-filter: blur(18px) saturate(1.2);
  background: color-mix(in srgb, var(--color-bg) 72%, transparent);
  border-bottom: 1px solid color-mix(in srgb, var(--color-text) 8%, transparent);
  transition: transform 0.4s var(--ease-out-expo), background 0.4s;
}
.site-header.is-hidden { transform: translateY(-110%); }

.nav-inner {
  max-width: var(--content-ultra);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-8);
}
.brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--color-text);
  text-decoration: none;
  font-family: var(--font-display);
  font-size: 1.15rem;
  letter-spacing: 0.04em;
}
.brand svg { width: 28px; height: 28px; color: var(--color-text); }
.brand-word { font-weight: 500; }
.brand-sub {
  font-family: var(--font-body);
  font-size: 0.6875rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-left: var(--space-2);
  padding-left: var(--space-3);
  border-left: 1px solid var(--color-border);
}

.nav-primary {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}
.nav-primary a {
  font-size: 0.8125rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-text);
  text-decoration: none;
  position: relative;
  padding-bottom: 4px;
}
.nav-primary a::after {
  content: '';
  position: absolute; left: 0; right: 0; bottom: 0; height: 1px;
  background: var(--color-accent);
  transform: scaleX(0); transform-origin: left;
  transition: transform 0.4s var(--ease-out-expo);
}
.nav-primary a:hover::after,
.nav-primary a.is-current::after { transform: scaleX(1); }
.nav-primary a.is-current { color: var(--color-accent); }

.nav-right { display: flex; align-items: center; gap: var(--space-4); }

.cta-nav {
  padding: 10px 22px;
  border-radius: var(--radius-pill);
  background: var(--color-text);
  color: var(--color-bg);
  font-size: 0.8125rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  text-decoration: none;
  transition: background 0.3s, color 0.3s;
}
.cta-nav:hover { background: var(--color-accent); color: var(--color-bg); }

.nav-burger {
  display: none;
  width: 38px; height: 38px;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  color: var(--color-text);
  background: transparent;
  align-items: center; justify-content: center;
}
.nav-burger svg { width: 18px; height: 18px; }

@media (max-width: 1100px) {
  .nav-primary { display: none; }
  .nav-burger { display: inline-flex; }
}
@media (max-width: 560px) {
  .cta-nav { display: none; }
  .brand-sub { display: none; }
  .site-header { padding: var(--space-4) var(--space-4); }
  .nav-inner { gap: var(--space-3); }
}

/* Mobile drawer */
.nav-drawer {
  position: fixed; inset: 0;
  z-index: 200;
  background: color-mix(in srgb, var(--color-bg) 96%, transparent);
  backdrop-filter: blur(24px);
  display: none;
  flex-direction: column;
  padding: var(--space-12) var(--space-6);
}
.nav-drawer.is-open { display: flex; }
.nav-drawer-close {
  align-self: flex-end;
  width: 44px; height: 44px;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  color: var(--color-text);
  display: grid; place-items: center;
}
.nav-drawer-list {
  list-style: none;
  margin-top: var(--space-10);
  display: grid;
  gap: var(--space-6);
}
.nav-drawer-list a {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 6vw, 2.5rem);
  color: var(--color-text);
  text-decoration: none;
}
.nav-drawer-list a em {
  font-style: italic;
  color: var(--color-accent);
}
.nav-drawer-cta {
  margin-top: auto;
  padding-top: var(--space-8);
  border-top: 1px solid var(--color-divider);
}

/* ====== Buttons ====== */
.btn-primary, .btn-ghost, .btn-line {
  display: inline-flex; align-items: center; gap: var(--space-3);
  padding: 16px 28px;
  font-size: 0.8125rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  text-decoration: none;
  border-radius: var(--radius-pill);
  font-weight: 500;
  cursor: pointer;
  border: 1px solid transparent;
  transition: background 0.3s, color 0.3s, border-color 0.3s, transform 0.3s;
}
.btn-primary {
  background: var(--color-text);
  color: var(--color-bg);
}
.btn-primary:hover { background: var(--color-accent); color: var(--color-bg); transform: translateY(-1px); }

.btn-ghost {
  color: var(--color-text);
  border-color: var(--color-text);
}
.btn-ghost:hover { background: var(--color-text); color: var(--color-bg); }

.btn-line {
  color: var(--color-text);
  padding: 0 0 10px 0;
  border-radius: 0;
  border-bottom: 1px solid currentColor;
  text-transform: none;
  letter-spacing: 0.04em;
}
.btn-line:hover { color: var(--color-accent); }

/* ====== Eyebrow ====== */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  font-family: var(--font-body);
  font-size: 0.75rem;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  padding-bottom: var(--space-3);
}
.eyebrow .bar { width: 42px; height: 1px; background: currentColor; }

/* ====== Section util ====== */
.section {
  padding: clamp(var(--space-16), 8vw, var(--space-32)) clamp(var(--space-5), 3vw, var(--space-10));
}
.section-inner {
  max-width: var(--content-ultra);
  margin: 0 auto;
  width: 100%;
}
.section-head {
  display: grid;
  gap: var(--space-6);
  margin-bottom: var(--space-16);
  max-width: 70ch;
}
.section-head h2 {
  font-size: var(--text-2xl);
  font-weight: 400;
  line-height: 1.05;
  letter-spacing: -0.02em;
}
.section-head h2 em {
  font-style: italic;
  color: var(--color-accent);
}
.section-head p {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  line-height: 1.55;
}

/* ====== Footer ====== */
.site-footer {
  border-top: 1px solid var(--color-divider);
  background: var(--color-surface);
  padding: var(--space-20) clamp(var(--space-5), 3vw, var(--space-10)) var(--space-10);
}
.footer-inner {
  max-width: var(--content-ultra);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: var(--space-10);
  padding-bottom: var(--space-16);
  border-bottom: 1px solid var(--color-divider);
}
.footer-mark {
  font-family: var(--font-display);
  font-size: 1.6rem;
  letter-spacing: 0.04em;
  margin-bottom: var(--space-4);
}
.footer-mark em { color: var(--color-accent); font-style: italic; }
.footer-desc {
  color: var(--color-text-muted);
  max-width: 38ch;
  font-size: var(--text-sm);
  line-height: 1.6;
}
.footer-inner h4 {
  font-family: var(--font-body);
  font-size: 0.75rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: var(--space-5);
}
.footer-inner ul {
  display: grid;
  gap: var(--space-3);
  list-style: none;
}
.footer-inner a {
  color: var(--color-text);
  text-decoration: none;
  opacity: 0.85;
  font-size: var(--text-sm);
}
.footer-inner a:hover { color: var(--color-accent); opacity: 1; }
.footer-meta {
  max-width: var(--content-ultra);
  margin: var(--space-8) auto 0;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-4);
  color: var(--color-text-faint);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

@media (max-width: 880px) {
  .footer-inner { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 520px) {
  .footer-inner { grid-template-columns: 1fr; }
}

/* ====== Reveal animation ====== */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.9s var(--ease-out-expo), transform 0.9s var(--ease-out-expo);
}
.reveal.is-visible {
  opacity: 1;
  transform: none;
}