/* =====================================================
   BASE LAYOUT — viewport, sections, nav, buttons, type
   ===================================================== */

/* ---------- viewport / camera / tracks ----------
   Single source of truth lives in css/scroll.css.
   Keep only layout primitives here. ---------- */

/* ---------- nav ---------- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 18px 0;
  mix-blend-mode: difference;
  color: #fff;
  pointer-events: none;
}

.nav-inner {
  position: relative;
  z-index: 2;
}

.nav-inner {
  width: min(var(--maxw), 92vw);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  pointer-events: auto;
}

.brand {
  font-family: var(--display);
  font-weight: 800;
  font-size: 1.1rem;
  letter-spacing: -0.02em;
}

.nav-links {
  display: flex;
  gap: 28px;
}

.nav-link {
  font-family: var(--mono);
  font-size: 0.76rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  outline: none;
}

.nav-link:focus-visible .hover-swap-wrap {
  box-shadow: 0 0 0 2px var(--mood-accent);
  border-radius: 2px;
}

.btn-sm {
  padding: 8px 14px;
  font-size: 0.7rem;
}

@media (max-width: 720px) {
  .nav { position: absolute; }
  .nav-links { display: none; }
  .nav-inner { padding: 0 4vw; }
  .brand { font-size: 1rem; }
  .btn-sm { padding: 6px 10px; font-size: 0.65rem; }
}

/* ---------- typography ---------- */
.display-xl {
  font-family: var(--display);
  font-weight: 900;
  font-size: clamp(4rem, 14vw, 12rem);
  line-height: 0.88;
  letter-spacing: -0.04em;
}

.display-lg {
  font-family: var(--display);
  font-weight: 800;
  font-size: clamp(2.6rem, 7vw, 5rem);
  line-height: 0.95;
  letter-spacing: -0.03em;
}

.display-md {
  font-family: var(--display);
  font-weight: 700;
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  line-height: 1.05;
  letter-spacing: -0.02em;
}

.serif-hero {
  font-family: var(--serif);
  font-style: italic;
  font-weight: 600;
  font-size: clamp(3rem, 10vw, 8rem);
  line-height: 0.95;
}

.body-lg {
  font-size: clamp(1.05rem, 1.6vw, 1.25rem);
  line-height: 1.65;
  color: var(--mood-muted);
}

.body-md {
  font-size: 1rem;
  line-height: 1.6;
  color: var(--mood-muted);
}

.mono-label {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--mood-muted);
}

/* ---------- buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--mono);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  padding: 12px 20px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform var(--transition-fast), background var(--transition-fast), border-color var(--transition-fast);
}

.btn:active { transform: translateY(1px); }

.btn-primary {
  background: var(--mood-accent);
  color: var(--mood-bg);
  border-color: var(--mood-accent);
}

.btn-primary:hover {
  background: var(--mood-accent-2);
  border-color: var(--mood-accent-2);
  transform: translateY(-2px);
}

.btn-ghost {
  background: transparent;
  color: var(--mood-text);
  border-color: var(--mood-border-2);
}

.btn-ghost:hover {
  border-color: var(--mood-accent);
  color: var(--mood-accent);
  transform: translateY(-2px);
}

/* ---------- chips ---------- */
.chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--mono);
  font-size: 0.76rem;
  color: var(--mood-muted);
  padding: 8px 14px;
  border: 1px solid var(--mood-border);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.02);
  transition: color var(--transition-fast), border-color var(--transition-fast), background var(--transition-fast), transform var(--transition-fast);
  cursor: pointer;
}

.chip:hover {
  color: var(--mood-text);
  border-color: var(--mood-accent);
  background: color-mix(in srgb, var(--mood-accent) 8%, transparent);
  transform: translateY(-2px);
}

.chip-static { cursor: default; }
.chip-static:hover { transform: none; border-color: var(--mood-border); color: var(--mood-muted); }

/* ---------- section head ---------- */
.sec-head {
  display: flex;
  align-items: baseline;
  gap: 18px;
  margin-bottom: 32px;
}

.sec-num {
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--mood-accent);
  letter-spacing: 0.04em;
}

.sec-title {
  font-family: var(--display);
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 800;
  letter-spacing: -0.02em;
}

.sec-rule {
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, var(--mood-border-2), transparent);
  align-self: center;
}

/* ---------- reveal utility ---------- */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.reveal.visible {
  opacity: 1;
  transform: none;
}

html.is-reduced-motion .reveal,
html:not(.is-scroll-path) .reveal,
html:not(.js) .reveal {
  opacity: 1;
  transform: none;
}

/* ---------- organic glow layer ---------- */
.glow-layer {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
}

.glow-blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.55;
  will-change: transform;
}

/* ---------- scroll blur overlay ---------- */
.scroll-blur {
  position: fixed;
  inset: 0;
  z-index: 90;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.15s ease;
}

.scroll-blur.is-left   { background: linear-gradient(90deg, color-mix(in srgb, var(--mood-text) 14%, transparent), transparent 22%); backdrop-filter: blur(5px); }
.scroll-blur.is-right  { background: linear-gradient(270deg, color-mix(in srgb, var(--mood-text) 14%, transparent), transparent 22%); backdrop-filter: blur(5px); }
.scroll-blur.is-top    { background: linear-gradient(180deg, color-mix(in srgb, var(--mood-text) 14%, transparent), transparent 22%); backdrop-filter: blur(5px); }
.scroll-blur.is-bottom { background: linear-gradient(0deg, color-mix(in srgb, var(--mood-text) 14%, transparent), transparent 22%); backdrop-filter: blur(5px); }

html.is-reduced-motion .scroll-blur,
html:not(.is-scroll-path) .scroll-blur {
  display: none;
}

/* ---------- responsive base ---------- */
@media (max-width: 980px) {
  .display-xl { font-size: clamp(3.2rem, 18vw, 7rem); }
  .display-lg { font-size: clamp(2rem, 10vw, 3.5rem); }
  .serif-hero { font-size: clamp(2.4rem, 14vw, 5rem); }
}