/* 공통 반응형 — 태블릿(900px 이하) & 모바일(640px 이하) */

.desktop-nav .nav-link--contact-bar {
  display: none;
}

@media (max-width: 900px) {
  .site-header .desktop-nav {
    justify-self: end;
  }

  .site-header .header-contact {
    grid-column: 3;
    justify-self: end;
  }

  .cursor {
    display: none;
  }

  .site-header {
    grid-template-columns: auto minmax(0, 1fr) auto;
    align-items: center;
    column-gap: 0.75rem;
  }

  .header-contact {
    display: flex;
    align-self: center;
    justify-self: end;
    min-height: 36px;
    padding: 0 0.85rem;
    font-size: clamp(0.68rem, 2.6vw, 0.76rem);
  }

  .desktop-nav {
    display: flex;
    justify-self: end;
    align-items: center;
    gap: clamp(0.25rem, 1.6vw, 0.65rem);
    min-width: 0;
    font-size: clamp(0.68rem, 2.6vw, 0.78rem);
    letter-spacing: 0.02em;
    white-space: nowrap;
  }

  .desktop-nav a {
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 36px;
    min-height: 36px;
    padding-inline: 0.12rem;
  }

  .desktop-nav a[href*="process"],
  .desktop-nav .nav-link--process,
  .desktop-nav .nav-link--contact-bar {
    display: none;
  }

  .site-header {
    width: 100%;
    max-width: 100%;
    overflow-x: clip;
  }

  .desktop-nav {
    overflow: hidden;
    max-width: 100%;
  }

  .menu-button {
    display: none;
    width: 44px;
    height: 44px;
    margin-right: 0;
    padding: 0;
    border: 0;
    background: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 6px;
    color: inherit;
  }

  .menu-button i {
    display: block;
    width: 24px;
    height: 1px;
    background: currentColor;
    transition: transform var(--duration-base) var(--ease-smooth);
  }

  .menu-button[aria-expanded="true"] i:first-of-type {
    transform: translateY(3.5px) rotate(45deg);
  }

  .menu-button[aria-expanded="true"] i:last-of-type {
    transform: translateY(-3.5px) rotate(-45deg);
  }

  .mobile-menu {
    display: none;
    visibility: hidden;
    opacity: 0;
    pointer-events: none;
    transform: translateY(-10px);
    position: fixed;
    inset: var(--header-height) 0 auto;
    height: calc(100dvh - var(--header-height));
    min-height: calc(100vh - var(--header-height));
    z-index: 110;
    background: #fff;
    color: var(--ink);
    padding-inline: var(--header-gutter);
    overflow-y: auto;
    overscroll-behavior: contain;
    flex-direction: column;
    gap: 0;
    transition:
      opacity var(--duration-base) var(--ease-gentle),
      transform var(--duration-base) var(--ease-smooth),
      visibility 0s linear var(--duration-base);
  }

  .mobile-menu.open {
    visibility: visible;
    opacity: 1;
    pointer-events: auto;
    transform: none;
    transition-delay: 0s;
  }

  .mobile-menu a {
    display: flex;
    align-items: center;
    min-height: 64px;
    font-size: clamp(2.8rem, 13vw, 5rem);
    letter-spacing: -0.05em;
    line-height: 1.35;
    border-bottom: 1px solid var(--line);
    opacity: 0;
    transform: translateY(20px);
    transition:
      opacity var(--duration-base) var(--ease-gentle),
      transform calc(var(--duration-base) + 0.1s) var(--ease-smooth);
  }

  .mobile-menu.open a {
    opacity: 1;
    transform: none;
  }

  .mobile-menu.open a:nth-child(2) {
    transition-delay: 0.06s;
  }

  .mobile-menu.open a:nth-child(3) {
    transition-delay: 0.12s;
  }

  .mobile-menu.open a:nth-child(4) {
    transition-delay: 0.18s;
  }

  .mobile-menu a[aria-current] {
    font-weight: 600;
  }

  .site-header.scrolled {
    background: #fff;
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
  }

  .site-header .brand {
    min-height: 0;
    height: 1.21rem;
    align-self: center;
    align-items: center;
    justify-content: center;
  }

  .site-header .brand-logo {
    inset: auto 0 auto 0;
    top: 50%;
    transform: translateY(-50%);
  }

  body.menu-open .site-header {
    background: #fff;
    color: var(--ink);
    border-color: var(--line);
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
  }

  body.menu-open .site-header .brand-logo-black {
    opacity: 1;
  }

  body.menu-open .site-header .brand-logo-white {
    display: block !important;
    opacity: 0;
  }

  :root {
    --header-height: 62px;
    --header-gutter: var(--pad);
  }

  .site-header,
  .site-header.scrolled {
    height: var(--header-height);
    padding-inline: var(--header-gutter);
  }

  .portfolio-page,
  .project-detail {
    padding-top: var(--header-height);
  }

  .inner-footer {
    grid-template-columns: 1fr auto;
  }

  .inner-footer p {
    display: none;
  }
}

@media (max-width: 640px) {
  :root {
    --pad: 1.25rem;
  }

  .scroll-top {
    right: max(1.25rem, var(--pad));
    bottom: 1.25rem;
  }

  .inner-footer > a:last-child {
    font-size: 0.55rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

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

  .scroll-top {
    transform: none;
    transition:
      opacity var(--duration-fast) var(--ease-gentle),
      visibility var(--duration-fast) var(--ease-gentle);
  }

  .scroll-top.is-visible {
    transform: none;
  }

  .hero-media {
    animation: none !important;
  }

  .cursor {
    display: none;
  }
}