site-footer,
footer.site {
  display: block;
}

site-header,
header.site {
  display: block;
  position: sticky;
  top: 0;
  z-index: 50;
}

/* ===== Header ===== */
header.site {
  background: rgba(247, 244, 238, .85);
  backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--line);
  transition: transform .4s ease, background .3s, box-shadow .3s;
}

header.site.scrolled {
  background: rgba(247, 244, 238, .95);
  box-shadow: 0 4px 16px rgba(0, 0, 0, .04);
}

header.site.hidden {
  transform: translateY(-100%);
}

body.nav-open {
  overflow: hidden;
}

body.nav-open header.site {
  transform: none;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 76px;
  padding: 18px 28px;
  max-width: var(--max);
  margin: 0 auto;
  gap: 24px;
  box-sizing: border-box;
}

.logo {
  display: flex;
  align-items: center;
  flex: 0 0 auto;
  font-family: "Archivo Black", sans-serif;
  font-size: 26px;
  letter-spacing: -.02em;
  line-height: 0;
}

.logo img {
  display: block;
  width: 100px;
  height: 40px;
  object-fit: contain;
}

.logo span {
  font-family: "Inter", sans-serif;
  font-weight: 400;
  font-size: 24px;
  color: var(--ink-soft);
}

.nav-menu {
  display: flex;
  gap: 34px;
  font-size: 13px;
  letter-spacing: .08em;
  text-transform: uppercase;
  font-weight: 500;
}

.nav-menu a {
  transition: opacity .2s;
  padding-bottom: 2px;
}

.nav-menu a:hover {
  opacity: .6;
}

.nav-menu a.current {
  border-bottom: 2px solid var(--ink);
}

/* ===== Burger (mobile) ===== */
.burger {
  display: none;
  width: 34px;
  height: 34px;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  padding: 0 6px;
  background: none;
  border: none;
  cursor: pointer;
  /* iOS Safari 会给 button 保留原生外观，导致内部竖条不渲染，需重置 */
  -webkit-appearance: none;
  appearance: none;
  -webkit-tap-highlight-color: transparent;
}

.burger span {
  display: block;
  width: 100%;
  height: 2px;
  /* site.css 自身未定义 --ink，加兜底色，避免变量缺失时竖条透明 */
  background: var(--ink, #0d0d0d);
  border-radius: 2px;
  transition: .25s;
}

.burger.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.burger.active span:nth-child(2) {
  opacity: 0;
}

.burger.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.burger:focus-visible,
.nav-menu a:focus-visible {
  outline: 2px solid var(--ink);
  outline-offset: 4px;
}

.nav-backdrop {
  display: none;
}

@media (max-width: 880px) {
  .nav {
    min-height: 68px;
    padding: 14px 20px;
    gap: 16px;
  }

  .burger {
    display: flex;
    order: 2;
  }

  .logo {
    order: 1;
  }

  .nav-menu {
    order: 3;
  }

  .nav-menu {
    position: fixed;
    top: var(--mobile-nav-top, 64px);
    left: 0;
    right: 0;
    max-height: calc(100dvh - var(--mobile-nav-top, 64px));
    overflow-y: auto;
    flex-direction: column;
    gap: 0;
    background: var(--bg);
    padding: 8px 24px 24px;
    border-bottom: 1px solid var(--line);
    transform: translateY(-12px);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: transform .25s ease, opacity .2s ease, visibility .2s ease;
    z-index: 60;
    box-shadow: 0 8px 24px rgba(0, 0, 0, .04);
  }

  .nav-menu.open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
  }

  .nav-menu a {
    padding: 16px 0;
    font-size: 15px;
    letter-spacing: .04em;
    border-bottom: 1px solid var(--line);
  }

  .nav-menu a:last-child {
    border-bottom: none;
  }

  .nav-menu a.current {
    border-bottom: 1px solid var(--line);
    color: var(--ink);
    font-weight: 700;
  }

  .nav-menu a:last-child.current {
    border-bottom: none;
  }

  .nav-backdrop {
    display: block;
    position: fixed;
    top: var(--mobile-nav-top, 64px);
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(13, 13, 13, .22);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity .2s ease, visibility .2s ease;
    z-index: 45;
  }

  .nav-backdrop.open {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
  }
}

@media (max-width: 480px) {
  .logo {
    font-size: 22px;
  }

  .logo span {
    font-size: 20px;
  }

  .nav {
    min-height: 64px;
    padding: 12px 16px;
  }
}

/* ===== Footer ===== */
footer.site {
  background: var(--ink);
  color: #dcdcdc;
  padding: 80px 0 0;
}

.foot-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1fr;
  gap: 60px;
  padding: 0 28px;
  max-width: var(--max);
  margin: 0 auto;
}

/* Footer email signup */
.foot-signup {
  max-width: 320px;
}

.foot-signup-title {
  margin: 0 0 20px;
  font-family: "Archivo Black", sans-serif;
  font-size: 26px;
  line-height: 1.1;
  letter-spacing: -.01em;
  text-transform: uppercase;
  color: #fff;
}

.foot-signup-text {
  margin: 0 0 22px;
  font-size: 14px;
  line-height: 1.5;
  color: #fff;
}

.foot-signup-form {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.foot-signup-input {
  width: 100%;
  padding: 14px 18px;
  border: none;
  border-radius: 4px;
  background: #fff;
  color: #222;
  font-size: 14px;
  font-family: inherit;
  box-sizing: border-box;
}

.foot-signup-input::placeholder {
  color: #9a9a9a;
}

.foot-signup-btn {
  width: 100%;
  padding: 14px 18px;
  border: 1px solid #4a4a4a;
  border-radius: 4px;
  background: #fff;
  color: #111;
  font-size: 13px;
  letter-spacing: .08em;
  text-transform: uppercase;
  cursor: pointer;
  transition: background .2s, color .2s;
}

.foot-signup-btn:hover {
  background: transparent;
  color: #fff;
}

footer h4 {
  margin: 0 0 22px;
  font-family: "Archivo Black", sans-serif;
  font-size: 13px;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: #fff;
}

footer ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
  font-size: 14px;
  color: #bcbcbc;
}

footer a:hover {
  color: #fff;
}

.foot-bottom {
  margin-top: 60px;
  padding: 24px 28px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  max-width: var(--max);
  margin-left: auto;
  margin-right: auto;
  font-size: 12px;
  color: #fff;
}

.mega {
  font-family: "Archivo Black", sans-serif;
  font-size: clamp(60px, 16vw, 240px);
  line-height: .85;
  color: #fff;
  text-align: center;
  letter-spacing: -.06em;
  padding: 30px 0 0;
  overflow: hidden;
  white-space: nowrap;
}

.mega span {
  font-family: "Inter", sans-serif;
  font-weight: 300;
  color: #aaa;
}

@media (max-width: 720px) {
  .foot-grid {
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    padding: 0 20px;
  }

  .foot-signup {
    grid-column: 1 / -1;
    max-width: 100%;
  }

  footer.site {
    padding: 60px 0 0;
  }
}

@media (max-width: 480px) {
  .foot-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .foot-bottom {
    flex-direction: column;
    align-items: flex-start;
    padding: 20px;
  }
}