/* ===========================================================
   Header / Nav / Footer
   =========================================================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(247, 246, 242, 0.92);
  backdrop-filter: blur(10px) saturate(1.1);
  border-bottom: 1px solid var(--c-line);
}

.site-header__inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 18px var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

/* Logotype ------------------------------------------------ */
.logo {
  display: flex;
  align-items: center;
}
.logo img {
  height: 42px;
  width: auto;
  display: block;
  transition: opacity .3s var(--ease);
}
.logo:hover img { opacity: 0.72; }
.footer__brand .logo img { height: 46px; }

/* Nav ------------------------------------------------------ */
.nav {
  display: flex;
  align-items: center;
  gap: clamp(20px, 3vw, 40px);
}
.nav__links {
  display: flex;
  gap: clamp(18px, 2.6vw, 34px);
}
.nav__links a {
  font-size: 0.86rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--c-charcoal);
  position: relative;
  padding: 4px 0;
  transition: color .25s var(--ease);
}
.nav__links a::after {
  content: "";
  position: absolute;
  left: 0; right: 100%;
  bottom: -2px;
  height: 1px;
  background: var(--c-accent);
  transition: right .3s var(--ease);
}
.nav__links a:hover,
.nav__links a[aria-current="page"] { color: var(--c-black); }
.nav__links a:hover::after,
.nav__links a[aria-current="page"]::after { right: 0; }

.nav__toggle {
  display: none;
  background: none;
  border: none;
  width: 32px; height: 22px;
  position: relative;
}
.nav__toggle span {
  position: absolute;
  left: 0; right: 0;
  height: 1.5px;
  background: var(--c-black);
  transition: transform .3s var(--ease), opacity .3s var(--ease), top .3s var(--ease);
}
.nav__toggle span:nth-child(1) { top: 2px; }
.nav__toggle span:nth-child(2) { top: 10px; }
.nav__toggle span:nth-child(3) { top: 18px; }
.nav--open .nav__toggle span:nth-child(1) { top: 10px; transform: rotate(45deg); }
.nav--open .nav__toggle span:nth-child(2) { opacity: 0; }
.nav--open .nav__toggle span:nth-child(3) { top: 10px; transform: rotate(-45deg); }

/* Buttons ---------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--f-body);
  font-weight: 600;
  font-size: 0.88rem;
  letter-spacing: 0.01em;
  padding: 14px 26px;
  border-radius: var(--radius-s);
  border: 1px solid transparent;
  transition: background .28s var(--ease), color .28s var(--ease), border-color .28s var(--ease), transform .28s var(--ease);
  white-space: nowrap;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary {
  background: var(--c-black);
  color: var(--c-warm-white);
}
.btn-primary:hover { background: var(--c-accent); }
.btn-secondary {
  background: transparent;
  color: var(--c-black);
  border-color: var(--c-black);
}
.btn-secondary:hover { border-color: var(--c-accent); color: var(--c-accent); }
.section--dark .btn-secondary { color: var(--c-warm-white); border-color: var(--c-warm-white); }
.section--dark .btn-secondary:hover { border-color: var(--c-accent-light); color: var(--c-accent-light); }
.btn-ghost {
  background: transparent;
  color: var(--c-accent);
  padding: 8px 0;
  border-radius: 0;
}
.btn-ghost::after { content: "→"; margin-left: 2px; transition: transform .25s var(--ease); display: inline-block; }
.btn-ghost:hover::after { transform: translateX(4px); }

.btn-row { display: flex; flex-wrap: wrap; gap: 14px; }

/* Footer ------------------------------------------------------ */
.site-footer {
  background: var(--c-black);
  color: var(--c-soft-gray);
  padding: 64px 0 28px;
}
.footer__top {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 48px;
  border-bottom: 1px solid var(--c-line-dark);
}
.footer__brand .logo__mark { color: var(--c-warm-white); }
.footer__brand .logo__mark .ring { border-color: var(--c-warm-white); }
.footer__brand .logo__word { color: var(--c-soft-gray); }
.footer__tagline {
  margin-top: 16px;
  font-size: 0.9rem;
  color: #A9A9A5;
  max-width: 30ch;
}
.footer__col h4 {
  font-family: var(--f-body);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: #8C8C88;
  margin-bottom: 18px;
}
.footer__col li { margin-bottom: 12px; }
.footer__col a {
  font-size: 0.92rem;
  color: var(--c-soft-gray);
  transition: color .25s var(--ease);
}
.footer__col a:hover { color: var(--c-accent-light); }
.footer__bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  padding-top: 24px;
  font-size: 0.8rem;
  color: #797975;
}

@media (max-width: 860px) {
  .nav__links {
    position: absolute;
    top: 100%; left: 0; right: 0;
    flex-direction: column;
    background: var(--c-warm-white);
    border-bottom: 1px solid var(--c-line);
    padding: 8px var(--gutter) 28px;
    gap: 4px;
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition: opacity .25s var(--ease), transform .25s var(--ease);
  }
  .nav--open .nav__links {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
  }
  .nav__links a { display: block; padding: 12px 0; border-bottom: 1px solid var(--c-line); font-size: 0.98rem; }
  .nav__cta { display: none; }
  .nav--open .nav__cta { display: inline-flex; margin-top: 4px; }
  .nav__toggle { display: block; }
  .footer__top { grid-template-columns: 1fr 1fr; row-gap: 36px; }
  .footer__brand { grid-column: 1 / -1; }
}