/* =====================================================
   RESPONSIVE BASE（responsive-base.css より抜粋・適用）
   ===================================================== */
html {
  scroll-behavior: smooth;
}
body {
  line-break: strict;
  overflow-wrap: break-word;
  word-break: auto-phrase;
}
h1, h2, h3, h4, h5, h6 {
  text-wrap: balance;
}
p {
  text-wrap: pretty;
}
:root {
  --bp-sm:  480px;
  --bp-md:  768px;
  --bp-lg: 1024px;
  --bp-xl: 1280px;
}

/* ===== リセット ===== */
* { margin: 0; padding: 0; box-sizing: border-box; }
html, body { width: 100%; overflow-x: hidden; background: #000; }
body {
  font-family: "Noto Sans JP", "Hiragino Sans", sans-serif;
  color: #fff;
  min-height: 100vh;
}
a { color: inherit; text-decoration: none; }
button { font: inherit; background: none; border: none; cursor: pointer; }

/* =====================================================
   ローディング画面
   ===================================================== */
.loader {
  position: fixed;
  inset: 0;
  z-index: 9000;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity 0.7s ease, visibility 0.7s ease;
}
.loader.is-hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}
.loader__backdrop {
  position: absolute;
  inset: 0;
  background: #000;
}
.loader__inner {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: clamp(14px, 2vw, 22px);
}
.loader__bar {
  width: 2px;
  height: clamp(24px, 4vw, 40px);
  background: #fff;
  opacity: 0.15;
  transition: opacity 0.15s linear, transform 0.15s linear;
  transform: scaleY(0.3);
}
.loader__logo {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.loader__logo.is-visible {
  opacity: 1;
  transform: translateY(0);
}
.loader__logo-text {
  font-family: "Lexend Giga", sans-serif;
  font-size: clamp(14px, 1.6vw, 18px);
  letter-spacing: 0.3em;
  font-weight: 500;
}
.loader__percent {
  position: absolute;
  bottom: clamp(-70px, -8vw, -50px);
  font-family: "Lexend Giga", sans-serif;
  font-size: clamp(11px, 1.2vw, 13px);
  letter-spacing: 0.15em;
  opacity: 0.5;
}

/* =====================================================
   ヘッダー
   ===================================================== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 500;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: clamp(16px, 2.4vw, 28px) clamp(16px, 4vw, 48px);
}
.site-header__logo {
  display: flex;
  align-items: center;
}
.site-header__nav {
  display: flex;
  gap: clamp(18px, 2.4vw, 34px);
}
.site-header__link {
  font-size: clamp(11px, 0.9vw, 13px);
  letter-spacing: 0.08em;
  font-weight: 500;
  opacity: 0.9;
  transition: opacity 0.25s ease;
}
.site-header__link:hover { opacity: 0.55; }

.site-header__hamburger {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 24px;
  height: 24px;
}
.site-header__hamburger span {
  display: block;
  width: 100%;
  height: 1.5px;
  background: #fff;
}

@media screen and (max-width: 767px) {
  .site-header__nav { display: none; }
}

/* =====================================================
   ヒーロー
   ===================================================== */
.hero {
  position: relative;
  width: 100%;
  height: 100svh;
  min-height: 480px;
  overflow: hidden;
  display: flex;
  align-items: center;
}
.hero__bg {
  position: absolute;
  inset: 0;
  background: radial-gradient(120% 100% at 30% 20%, #4a4238 0%, #1c1a17 55%, #0a0a0a 100%);
  transform: scale(1.08);
  animation: heroPan 16s ease-in-out infinite alternate;
}
@keyframes heroPan {
  from { transform: scale(1.08) translate(0, 0); }
  to   { transform: scale(1.14) translate(-1.5%, -1.5%); }
}
.hero__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(0,0,0,0.35) 0%, rgba(0,0,0,0.15) 40%, rgba(0,0,0,0.5) 100%);
}

.hero__copy {
  position: relative;
  z-index: 2;
  width: 100%;
  padding: 0 clamp(16px, 4vw, 48px);
}
.hero__title {
  font-family: "Lexend Giga", sans-serif;
  font-weight: 500;
  font-size: clamp(40px, 9.5vw, 150px);
  line-height: 1.02;
  letter-spacing: -0.02em;
}
.hero__title-row {
  display: block;
  overflow: hidden;
}
.hero__title .reveal {
  display: inline-block;
  transform: translateY(110%);
  transition: transform 0.9s cubic-bezier(0.215, 0.61, 0.355, 1);
}
.hero__title.is-revealed .reveal {
  transform: translateY(0);
}
.hero__title-row:nth-child(2) .reveal { transition-delay: 0.12s; }
.hero__title-row:nth-child(3) .reveal { transition-delay: 0.24s; }

.hero__desc {
  position: absolute;
  left: clamp(16px, 4vw, 48px);
  bottom: clamp(24px, 4vw, 48px);
  z-index: 2;
  max-width: 360px;
  font-size: clamp(10px, 0.85vw, 12px);
  line-height: 1.8;
  opacity: 0;
  letter-spacing: 0.02em;
  transition: opacity 0.8s ease 0.6s;
}
.hero__desc.is-revealed { opacity: 0.75; }

.hero__scroll {
  position: absolute;
  right: clamp(16px, 4vw, 48px);
  bottom: clamp(24px, 4vw, 48px);
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  opacity: 0;
  transition: opacity 0.8s ease 0.9s;
}
.hero__scroll.is-revealed { opacity: 1; }
.hero__scroll-line {
  width: 1px;
  height: 40px;
  background: rgba(255,255,255,0.4);
}
.hero__scroll svg { animation: scrollBounce 1.8s ease-in-out infinite; }
@keyframes scrollBounce {
  0%, 100% { transform: translateY(0); opacity: 0.6; }
  50% { transform: translateY(6px); opacity: 1; }
}

@media screen and (max-width: 767px) {
  .hero__desc { max-width: 240px; }
}