/* ==========================================================================
   layout.css — Container, navigation bar, footer, page scaffolding.
   ========================================================================== */

/* ---------- Container ---------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: clamp(1.25rem, 1rem + 2vw, 2.5rem);
}
.container-narrow {
  max-width: var(--container-narrow);
  margin-inline: auto;
  padding-inline: clamp(1.25rem, 1rem + 2vw, 2.5rem);
}

/* ---------- Section spacing ---------- */
section { padding-block: var(--space-9); position: relative; }
.section-tight { padding-block: var(--space-7); }
.section-title { margin-bottom: var(--space-6); }
.section-title .eyebrow {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: var(--fs-xs);
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--accent-violet);
  margin-bottom: var(--space-3);
  padding: 4px 10px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-pill);
  background: var(--surface-glass);
}
.section-title h2 { margin-bottom: var(--space-3); }
.section-title p { color: var(--text-secondary); font-size: var(--fs-lg); }

/* ---------- Scroll progress bar ---------- */
.scroll-progress {
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 3px;
  background: transparent;
  z-index: 1001;
  pointer-events: none;
}
.scroll-progress__bar {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--accent-violet), var(--accent-coral));
  box-shadow: 0 0 10px var(--accent-violet);
  transition: width 60ms linear;
}

/* ---------- Navigation ---------- */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 1000;
  width: 100%;
  backdrop-filter: blur(18px) saturate(140%);
  -webkit-backdrop-filter: blur(18px) saturate(140%);
  background: var(--surface-glass-strong);
  border-bottom: 1px solid var(--border-soft);
  transition: background var(--transition-base), border-color var(--transition-base);
}
.site-nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-height);
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: clamp(1.25rem, 1rem + 2vw, 2.5rem);
  gap: var(--space-5);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  font-family: var(--font-display);
  font-size: var(--fs-lg);
  font-weight: 500;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}
.brand__mark {
  width: 36px; height: 36px;
  display: grid; place-items: center;
  border-radius: 10px;
  background: linear-gradient(135deg, rgba(169,155,255,0.3), rgba(240,169,142,0.25));
  border: 1px solid var(--border-strong);
  font-family: var(--font-display);
  font-weight: 600;
  color: var(--text-primary);
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.08);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-5);
}
.nav-links a {
  position: relative;
  display: inline-block;
  padding: 6px 2px;
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 500;
  transition: color var(--transition-fast);
}
.nav-links a::after {
  content: "";
  position: absolute;
  left: 0; right: 100%;
  bottom: -2px; height: 2px;
  background: linear-gradient(90deg, var(--accent-violet), var(--accent-coral));
  transition: right var(--transition-base);
  border-radius: 2px;
}
.nav-links a:hover,
.nav-links a[aria-current="page"] {
  color: var(--text-primary);
}
.nav-links a:hover::after,
.nav-links a[aria-current="page"]::after {
  right: 0;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

/* Theme toggle & hamburger */
.icon-btn {
  width: 40px; height: 40px;
  display: grid; place-items: center;
  border-radius: 10px;
  border: 1px solid var(--border-soft);
  background: var(--surface-glass);
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}
.icon-btn:hover {
  color: var(--text-primary);
  border-color: var(--accent-violet);
  background: var(--bg-3);
}
.icon-btn svg { width: 18px; height: 18px; }

.nav-toggle { display: none; }

/* ---------- Mobile nav ---------- */
@media (max-width: 900px) {
  .nav-toggle { display: grid; }
  .nav-links {
    position: fixed;
    inset: var(--nav-height) 0 0 0;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    padding: var(--space-6);
    gap: var(--space-2);
    background: var(--surface-glass-strong);
    backdrop-filter: blur(24px) saturate(140%);
    -webkit-backdrop-filter: blur(24px) saturate(140%);
    border-top: 1px solid var(--border-soft);
    transform: translateX(100%);
    transition: transform var(--transition-base);
    overflow-y: auto;
  }
  .nav-links.is-open { transform: translateX(0); }
  .nav-links a {
    display: block;
    padding: var(--space-4) var(--space-3);
    font-size: var(--fs-lg);
    border-bottom: 1px solid var(--border-soft);
  }
  .nav-links a::after { display: none; }
}

/* ---------- Footer ---------- */
.site-footer {
  margin-top: var(--space-9);
  padding-block: var(--space-7) var(--space-6);
  border-top: 1px solid var(--border-soft);
  background: linear-gradient(180deg, transparent, rgba(0,0,0,0.25));
}
.site-footer__inner {
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: clamp(1.25rem, 1rem + 2vw, 2.5rem);
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: var(--space-6);
}
.footer-col h6 {
  margin-bottom: var(--space-3);
  color: var(--text-tertiary);
}
.footer-col ul { display: flex; flex-direction: column; gap: var(--space-2); }
.footer-col a { color: var(--text-secondary); font-size: 0.95rem; }
.footer-col a:hover { color: var(--accent-violet); }
.footer-brand p {
  margin-top: var(--space-3);
  color: var(--text-secondary);
  font-size: 0.95rem;
  max-width: 32ch;
}
.footer-socials {
  display: flex; gap: var(--space-3);
  margin-top: var(--space-4);
}
.footer-socials a {
  width: 40px; height: 40px;
  display: grid; place-items: center;
  border-radius: 10px;
  border: 1px solid var(--border-soft);
  background: var(--surface-glass);
  transition: all var(--transition-fast);
}
.footer-socials a:hover {
  border-color: var(--accent-violet);
  color: var(--accent-violet);
  transform: translateY(-2px);
}
.footer-socials svg { width: 18px; height: 18px; }
.site-footer__meta {
  max-width: var(--container-max);
  margin: var(--space-6) auto 0;
  padding: var(--space-4) clamp(1.25rem, 1rem + 2vw, 2.5rem) 0;
  border-top: 1px solid var(--border-soft);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-3);
  font-size: var(--fs-sm);
  color: var(--text-tertiary);
}

@media (max-width: 720px) {
  .site-footer__inner { grid-template-columns: 1fr; }
}

/* ---------- Back-to-top ---------- */
.back-to-top {
  position: fixed;
  right: 22px; bottom: 22px;
  width: 46px; height: 46px;
  border-radius: 50%;
  background: var(--accent-violet);
  color: var(--bg-0);
  display: grid; place-items: center;
  opacity: 0; pointer-events: none;
  transform: translateY(10px);
  transition: all var(--transition-base);
  z-index: 900;
  box-shadow: var(--shadow-md), var(--glow-violet);
}
.back-to-top.is-visible { opacity: 1; pointer-events: auto; transform: translateY(0); }
.back-to-top:hover { background: var(--accent-violet-strong); color: #fff; }
.back-to-top svg { width: 18px; height: 18px; }

/* ---------- Decorative background (soft blobs) ---------- */
.bg-blobs {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: -1;
  overflow: hidden;
}
.bg-blobs span {
  position: absolute;
  width: 520px; height: 520px;
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.35;
  animation: float 22s ease-in-out infinite;
}
.bg-blobs span:nth-child(1) { background: #a99bff; top: -140px; left: -120px; }
.bg-blobs span:nth-child(2) { background: #f0a98e; top: 40%; right: -160px; animation-delay: -8s; }
.bg-blobs span:nth-child(3) { background: #7ad7c6; bottom: -200px; left: 30%; animation-delay: -14s; opacity: 0.25; }