/* ==========================
   token
   ========================== */

:root {
  --ink: #111;
  --paper: #fff;
  --muted: #6b6b6b;
  --line: #e3e3e3;
  --panel: #f2f1ee;
  --panel-soft: #f8f8f6;
  --accent: #fabf00;
  --header-height: 82px;
  --duration: 1s;
}

@media (prefers-reduced-motion: reduce) {
  :root {
    --duration: 0s;
  }
}

/* ==========================
   base
   ========================== */

::selection {
  background: var(--accent);
  color: var(--ink);
}

/* ==========================
   logo
   ========================== */

.logo {
  font-weight: 700;
  letter-spacing: 0.12em;
  font-size: 14px;
}

.logo img {
  display: block;
  height: 42px;
  width: auto;
}

/* ==========================
   header
   ========================== */

@media (min-width: 1024px) {
  .header:not(.is-light) {
    background: var(--paper);
    border-bottom-color: var(--line);
  }
}

.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: transparent;
  border-bottom: 1px solid transparent;
  display: flex;
  align-items: center;
  gap: 32px;
  padding: 0 24px;
  z-index: 100;
  transition: background-color calc(var(--duration) * .45) ease, border-color calc(var(--duration) * .45) ease;
}

.header__logo {
  position: relative;
  margin-right: auto;
}

/* ==========================
   global-nav
   ========================== */

.global-nav__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 32px;
  list-style: none;
}

.global-nav__link {
  position: relative;
  display: block;
  white-space: nowrap;
  transition: opacity calc(var(--duration) * .2), color calc(var(--duration) * .3);
}

.global-nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -4px;
  width: 100%;
  height: 1px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform calc(var(--duration) * .4) cubic-bezier(.23,1,.32,1);
}

.global-nav__link:hover {
  opacity: 0.55;
}

.global-nav__link:hover::after {
  transform: scaleX(1);
  transform-origin: left;
}

/* ==========================
   nav-toggle
   ========================== */

.nav-toggle {
  position: relative;
  display: none;
  width: 44px;
  height: 44px;
  cursor: pointer;
}

.nav-toggle__bar,
.nav-toggle__bar::before,
.nav-toggle__bar::after {
  position: absolute;
  left: 50%;
  width: 22px;
  height: 2px;
  background: var(--ink);
  transition: background calc(var(--duration) * .3), top calc(var(--duration) * .35) cubic-bezier(.23,1,.32,1), transform calc(var(--duration) * .35) cubic-bezier(.23,1,.32,1);
  transform: translateX(-50%);
  content: "";
}

.nav-toggle__bar {
  top: 50%;
  margin-top: -1px;
}

.nav-toggle__bar::before {
  top: -7px;
}

.nav-toggle__bar::after {
  top: 7px;
}

/* ==========================
   footer
   ========================== */

.footer {
  background: var(--panel-soft);
  padding: 48px 24px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 24px;
}

.footer__nav {
  font-size: 16px;
}

.footer__links {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-start;
  gap: 24px 48px;
  list-style: none;
}

.footer__nav a {
  position: relative;
  display: block;
  transition: opacity calc(var(--duration) * .2);
}

.footer__nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -4px;
  width: 100%;
  height: 1px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform calc(var(--duration) * .4) cubic-bezier(.23,1,.32,1);
}

.footer__nav a:hover {
  opacity: 0.55;
}

.footer__copy {
  font-size: 13px;
  color: var(--muted);
}

.footer__nav a:hover::after {
  transform: scaleX(1);
  transform-origin: left;
}

/* ==========================
   reveal
   ========================== */

.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity calc(var(--duration) * .9) cubic-bezier(0.22, 1, 0.36, 1), transform calc(var(--duration) * .9) cubic-bezier(0.22, 1, 0.36, 1);
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  .reveal {
    transition: none;
    opacity: 1;
    transform: none;
  }
}

/* ==========================
   sp
   ========================== */

@media (max-width: 1023px) {
  .header {
    gap: 12px;
    background: var(--paper);
    border-bottom: 1px solid var(--line);
  }

  .global-nav {
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    padding: 8px 24px 44px;
    background: var(--paper);
    border-bottom: 1px solid var(--line);
    clip-path: inset(0 0 100% 0);
    pointer-events: none;
    transition: clip-path calc(var(--duration) * .38) cubic-bezier(.23,1,.32,1);
  }

  .global-nav__list {
    display: block;
  }

  .header.is-nav-open .global-nav {
    clip-path: inset(0 0 0 0);
    pointer-events: auto;
  }

  .global-nav__link {
    display: block;
    padding: 18px 0 18px 48px;
    font-size: 22px;
    letter-spacing: 0.04em;
    line-height: 1.4;
  }

  .global-nav__link::before {
    content: "";
    position: absolute;
    left: 0;
    top: 50%;
    width: 28px;
    height: 2px;
    margin-top: -1px;
    background: var(--accent);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform calc(var(--duration) * .32) cubic-bezier(.23,1,.32,1);
  }

  .global-nav__link::after {
    display: none;
  }

  .global-nav__label {
    display: inline-block;
    opacity: 0;
    transform: translateY(12px);
    transition: opacity calc(var(--duration) * .28), transform calc(var(--duration) * .34) cubic-bezier(.23,1,.32,1);
  }

  .header.is-nav-open .global-nav__link::before {
    transform: scaleX(1);
  }

  .header.is-nav-open .global-nav__label {
    opacity: 1;
    transform: translateY(0);
  }

  .header.is-nav-open .global-nav__item:nth-child(1) .global-nav__link::before {
    transition-delay: calc(var(--duration) * .12);
  }

  .header.is-nav-open .global-nav__item:nth-child(1) .global-nav__label {
    transition-delay: calc(var(--duration) * .18);
  }

  .header.is-nav-open .global-nav__item:nth-child(2) .global-nav__link::before {
    transition-delay: calc(var(--duration) * .2);
  }

  .header.is-nav-open .global-nav__item:nth-child(2) .global-nav__label {
    transition-delay: calc(var(--duration) * .26);
  }

  .header.is-nav-open .global-nav__item:nth-child(3) .global-nav__link::before {
    transition-delay: calc(var(--duration) * .28);
  }

  .header.is-nav-open .global-nav__item:nth-child(3) .global-nav__label {
    transition-delay: calc(var(--duration) * .34);
  }

  .header.is-nav-open .global-nav__item:nth-child(4) .global-nav__link::before {
    transition-delay: calc(var(--duration) * .36);
  }

  .header.is-nav-open .global-nav__item:nth-child(4) .global-nav__label {
    transition-delay: calc(var(--duration) * .42);
  }

  .nav-toggle {
    display: block;
    flex: 0 0 auto;
  }

  .header.is-nav-open .nav-toggle__bar {
    background: transparent;
  }

  .header.is-nav-open .nav-toggle__bar::before {
    top: 0;
    transform: translateX(-50%) rotate(45deg);
  }

  .header.is-nav-open .nav-toggle__bar::after {
    top: 0;
    transform: translateX(-50%) rotate(-45deg);
  }
}

/* header band（背景を常時表示） */
.header {
  background: var(--paper);
  border-bottom-color: var(--line);
}