/* ============================================================
   LAYOUT — Containers, sections, navbar, footer, page shell.
   ============================================================ */

/* Page shell wraps everything that should blur/scale when menu opens */
.page-shell {
  position: relative;
  z-index: var(--z-content);
  transition: filter var(--t-med) var(--ease), transform var(--t-med) var(--ease);
  transform-origin: center top;
}
body.menu-open .page-shell {
  filter: blur(8px);
  transform: scale(0.96);
  pointer-events: none;
}

.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--space-6);
}
.container.narrow {
  max-width: var(--container-narrow);
}

/* Vertical rhythm for sections */
.section {
  padding-block: var(--space-10);
  position: relative;
}
.section.tight {
  padding-block: var(--space-8);
}

.section-head {
  max-width: 760px;
  margin-bottom: var(--space-8);
}
.section-head h2 {
  margin-top: var(--space-4);
}
.section-head p {
  margin-top: var(--space-4);
  max-width: 60ch;
}

/* Generic responsive grids */
.grid {
  display: grid;
  gap: var(--space-6);
}
.grid-2 {
  grid-template-columns: repeat(2, 1fr);
}
.grid-3 {
  grid-template-columns: repeat(3, 1fr);
}
.grid-4 {
  grid-template-columns: repeat(4, 1fr);
}

/* ============================================================
   NAVBAR — only LOGO + MENU button. Blur on scroll.
   ============================================================ */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-h);
  z-index: var(--z-nav);
  display: flex;
  align-items: center;
  transition: background var(--t-fast) var(--ease), backdrop-filter var(--t-fast) var(--ease),
    border-color var(--t-fast) var(--ease), height var(--t-fast) var(--ease);
  border-bottom: 1px solid transparent;
}
.navbar.scrolled {
  height: 68px;
  background: rgba(5, 5, 5, 0.6);
  backdrop-filter: blur(var(--blur)) saturate(160%);
  -webkit-backdrop-filter: blur(var(--blur)) saturate(160%);
  border-bottom-color: var(--border);
}
.navbar__inner {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--space-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* Logo */
.logo {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: -0.02em;
  text-decoration: none;
}
.logo__mark {
  display: block;
  width: 1.5rem;
  height: 1rem;
  flex-shrink: 0;
  transition: opacity var(--t-fast) var(--ease);
}
.logo__mark svg {
  display: block;
  width: 100%;
  height: 100%;
  shape-rendering: geometricPrecision;
}
.logo__text {
  font-size: 1.05rem;
  line-height: 1;
  letter-spacing: -0.02em;
  transition: opacity var(--t-fast) var(--ease);
}
.logo:hover .logo__mark,
.logo:hover .logo__text {
  opacity: 0.8;
}
@media (prefers-reduced-motion: reduce) {
  .logo:hover .logo__mark,
  .logo:hover .logo__text {
    opacity: 1;
  }
}
@media (max-width: 480px) {
  .logo__mark {
    width: 1.25rem;
    height: 0.833rem;
  }
  .logo__text {
    font-size: 1rem;
  }
}

/* MENU button */
.menu-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  padding: 0.65rem 1.15rem;
  border: 1px solid var(--border-strong);
  border-radius: var(--r-pill);
  background: var(--glass);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  font-weight: 600;
  font-size: 0.85rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  transition: border-color var(--t-fast) var(--ease), color var(--t-fast) var(--ease),
    background var(--t-fast) var(--ease);
}
.menu-btn:hover {
  border-color: var(--primary);
  background: rgba(59, 130, 246, 0.12);
}
.menu-btn__lines {
  display: inline-flex;
  flex-direction: column;
  gap: 4px;
  width: 20px;
}
.menu-btn__lines span {
  height: 1.5px;
  background: currentColor;
  border-radius: 2px;
  transition: transform var(--t-fast) var(--ease), width var(--t-fast) var(--ease);
}
.menu-btn__lines span:nth-child(1) {
  width: 20px;
}
.menu-btn__lines span:nth-child(2) {
  width: 13px;
  margin-left: auto;
}
.menu-btn:hover .menu-btn__lines span:nth-child(2) {
  width: 20px;
}

/* ============================================================
   FOOTER — minimal: large logo, nav, social, copyright.
   ============================================================ */
.footer {
  position: relative;
  z-index: var(--z-content);
  border-top: 1px solid var(--border);
  padding-block: var(--space-9) var(--space-6);
  margin-top: var(--space-8);
}
.footer__top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--space-8);
  flex-wrap: wrap;
}
.footer__brand {
  max-width: 420px;
}
.footer__logo {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1;
  margin-bottom: var(--space-4);
}
.footer__brand p {
  max-width: 38ch;
}
.footer__cols {
  display: flex;
  gap: var(--space-9);
  flex-wrap: wrap;
}
.footer__col h4 {
  font-size: 0.78rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--text-tertiary);
  margin-bottom: var(--space-4);
  font-weight: 600;
}
.footer__col ul {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}
.footer__col a {
  color: var(--text-secondary);
  transition: color var(--t-fast) var(--ease), padding-left var(--t-fast) var(--ease);
  width: fit-content;
}
.footer__col a:hover {
  color: var(--text);
  padding-left: 6px;
}
.footer__bottom {
  margin-top: var(--space-8);
  padding-top: var(--space-5);
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-4);
  flex-wrap: wrap;
  color: var(--text-tertiary);
  font-size: 0.85rem;
}
.footer__socials {
  display: flex;
  gap: var(--space-3);
}
.footer__socials a {
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  border: 1px solid var(--border);
  border-radius: 50%;
  color: var(--text-secondary);
  transition: transform var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease),
    color var(--t-fast) var(--ease);
}
.footer__socials a:hover {
  transform: translateY(-3px);
  border-color: var(--primary);
  color: var(--text);
}
.footer__socials svg {
  width: 18px;
  height: 18px;
}

/* ============================================================
   SCROLL PROGRESS BAR
   ============================================================ */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 2px;
  width: 100%;
  z-index: calc(var(--z-nav) + 1);
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: var(--grad-accent);
  will-change: transform;
}

/* ============================================================
   RESPONSIVE LAYOUT
   ============================================================ */
@media (max-width: 980px) {
  .grid-3,
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
}
@media (max-width: 720px) {
  .container {
    padding-inline: var(--space-5);
  }
  .section {
    padding-block: var(--space-9);
  }
  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }
  .footer__top {
    flex-direction: column;
  }
  .footer__cols {
    gap: var(--space-7);
  }
}