/* layout.css — page scaffolding: wrap, nav, sections, footer */

.wrap { max-width: var(--max); margin: 0 auto; padding: 0 clamp(20px, 5vw, 40px); }
.wrap.narrow { max-width: var(--max-narrow); }

/* ---------- Nav ---------- */
nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(250,247,245,.72);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color .3s var(--ease), background .3s var(--ease);
}
nav.scrolled {
  border-bottom-color: var(--line);
  background: rgba(250,247,245,.86);
}
.scroll-progress {
  position: absolute; left: 0; bottom: -1px; height: 2px; width: 100%;
  transform: scaleX(0); transform-origin: left; will-change: transform;
  background: linear-gradient(90deg, var(--rose), var(--accent));
}
nav .wrap {
  display: flex; align-items: center; justify-content: space-between;
  height: var(--nav-h); gap: 20px;
}
.nav-logo {
  font-family: var(--font-display);
  font-size: 20px; font-weight: 400; letter-spacing: -0.02em;
  color: var(--ink); text-decoration: none; white-space: nowrap;
  transition: opacity .15s;
}
.nav-logo:hover { opacity: .7; }
.nav-right { display: flex; align-items: center; gap: clamp(20px, 3vw, 36px); }
nav .links { display: flex; gap: clamp(20px, 3vw, 34px); align-items: center; }
nav .links a {
  text-decoration: none; color: var(--muted); font-size: 15px; font-weight: 500;
  position: relative; transition: color .15s; letter-spacing: -0.01em;
}
nav .links a::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -6px;
  height: 1.5px; background: var(--accent); border-radius: 2px;
  transform: scaleX(0); transform-origin: left; transition: transform .25s var(--ease);
}
nav .links a:hover { color: var(--accent); }
nav .links a:hover::after,
nav .links a.active::after { transform: scaleX(1); }
nav .links a.active { color: var(--accent); }

/* mobile menu toggle */
.nav-toggle {
  display: none; width: 42px; height: 42px; border: none; background: transparent;
  cursor: pointer; align-items: center; justify-content: center; border-radius: 12px;
  -webkit-tap-highlight-color: transparent;
}
.nav-toggle span {
  display: block; width: 20px; height: 2px; background: var(--ink); border-radius: 2px;
  position: relative; transition: transform .3s var(--ease), opacity .2s var(--ease);
}
.nav-toggle span::before, .nav-toggle span::after {
  content: ""; position: absolute; left: 0; width: 20px; height: 2px; background: var(--ink);
  border-radius: 2px; transition: transform .3s var(--ease);
}
.nav-toggle span::before { top: -6px; }
.nav-toggle span::after { top: 6px; }
body.menu-open .nav-toggle span { background: transparent; }
body.menu-open .nav-toggle span::before { transform: translateY(6px) rotate(45deg); }
body.menu-open .nav-toggle span::after { transform: translateY(-6px) rotate(-45deg); }

/* ---------- Sections ---------- */
section { padding: var(--section-gap) 0; position: relative; }
.section-fog { background: var(--fog); }
.section-ink { background: var(--ink); color: var(--cream); }

/* ---------- Footer ---------- */
footer { padding: 56px 0; text-align: center; color: var(--muted); font-size: 14px; border-top: 1px solid var(--line); }
footer a { color: var(--muted); }

/* ---------- Mobile nav drawer ---------- */
@media (max-width: 720px) {
  .nav-toggle { display: inline-flex; }
  .nav-right {
    position: fixed; inset: var(--nav-h) 0 auto 0;
    flex-direction: column; align-items: stretch; gap: 0;
    background: rgba(250,247,245,.98);
    backdrop-filter: blur(18px); -webkit-backdrop-filter: blur(18px);
    border-bottom: 1px solid var(--line);
    padding: 12px clamp(20px, 5vw, 40px) 24px;
    transform: translateY(-12px); opacity: 0; pointer-events: none;
    transition: transform .3s var(--ease), opacity .3s var(--ease);
  }
  body.menu-open .nav-right { transform: none; opacity: 1; pointer-events: auto; }
  nav .links { flex-direction: column; align-items: stretch; gap: 0; width: 100%; }
  nav .links a { padding: 15px 4px; font-size: 17px; border-bottom: 1px solid var(--line); }
  nav .links a::after { display: none; }
  .nav-right .btn { margin-top: 16px; justify-content: center; }
}