/* =====================================================
   SNT風 ローディング & ヒーロー デモ
   ===================================================== */

:root {
  --c-navy-950: #0a1122;
  --c-navy-900: #0e1830;
  --c-navy-800: #16264a;
  --c-navy-700: #22375f;
  --c-white: #ffffff;
  --font-en: "Host Grotesk", sans-serif;
  --font-jp: "Noto Sans JP", sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--c-navy-900);
  font-family: var(--font-jp);
  color: var(--c-white);
  overflow-x: hidden;
}

a { text-decoration: none; color: inherit; }

/* ===== Loading Screen ===== */
.loader {
  position: fixed;
  inset: 0;
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--c-navy-950);
  transition: opacity .7s ease, visibility .7s ease;
}
.loader.is-hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}
.loader-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: clamp(20px, 3vw, 28px);
}
.loader-mark {
  color: var(--c-white);
  animation: loader-pulse 1.6s ease-in-out infinite;
}
@keyframes loader-pulse {
  0%, 100% { opacity: .45; }
  50% { opacity: 1; }
}
.loader-bar {
  width: clamp(120px, 20vw, 180px);
  height: 1px;
  background: rgba(255, 255, 255, .18);
  overflow: hidden;
}
.loader-bar span {
  display: block;
  height: 100%;
  width: 0%;
  background: var(--c-white);
  transition: width .25s linear;
}

/* ===== Header ===== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: clamp(14px, 2.2vw, 22px) clamp(20px, 4vw, 48px);
  transition: background-color .3s ease, padding .3s ease;
}
.site-header.is-scrolled {
  background-color: rgba(10, 17, 34, .88);
  backdrop-filter: blur(6px);
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--c-white);
}
.brand-word {
  font-family: var(--font-en);
  font-weight: 600;
  font-size: 15px;
  letter-spacing: .18em;
}
.site-nav {
  display: flex;
  align-items: center;
  gap: clamp(18px, 2.4vw, 32px);
}
.site-nav a {
  font-size: 12.5px;
  font-weight: 500;
  letter-spacing: .02em;
  color: var(--c-white);
  white-space: nowrap;
  opacity: .92;
  transition: opacity .2s ease;
}
.site-nav a:hover { opacity: 1; }
.cta-btn {
  flex-shrink: 0;
  background: var(--c-white);
  color: var(--c-navy-800);
  font-size: 12.5px;
  font-weight: 600;
  padding: 11px clamp(16px, 2vw, 22px);
  border-radius: 3px;
  white-space: nowrap;
}
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 32px;
  height: 32px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}
.hamburger span {
  display: block;
  height: 1.5px;
  background: var(--c-white);
  border-radius: 1px;
}

/* ===== Hero ===== */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding-top: clamp(90px, 12vw, 130px);
  padding-bottom: clamp(70px, 8vw, 100px);
  background:
    radial-gradient(ellipse 70% 55% at 78% 30%, rgba(70, 100, 160, .35), transparent 60%),
    linear-gradient(160deg, var(--c-navy-900) 0%, var(--c-navy-950) 100%);
  overflow: hidden;
}

.hero-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: clamp(20px, 4vw, 40px);
  flex: 1;
}

.hero-copy {
  flex-shrink: 0;
  z-index: 2;
}
.hero-title {
  margin: 0;
  display: flex;
  flex-direction: column;
}
.hero-title .line {
  font-family: var(--font-en);
  font-weight: 600;
  font-size: clamp(40px, 8vw, 108px);
  line-height: .86;
  letter-spacing: -.02em;
  color: var(--c-white);
  opacity: 0;
  transform: translateY(30px);
  animation: line-in .8s cubic-bezier(.2, .7, .2, 1) forwards;
}
.hero-title .line:nth-child(1) { animation-delay: .15s; }
.hero-title .line:nth-child(2) { animation-delay: .28s; }
.hero-title .line:nth-child(3) { animation-delay: .41s; }
@keyframes line-in {
  to { opacity: 1; transform: translateY(0); }
}
.hero-sub {
  margin: clamp(16px, 2.4vw, 24px) 0 0;
  font-size: clamp(14px, 1.6vw, 21px);
  font-weight: 500;
  letter-spacing: .05em;
  color: var(--c-white);
  opacity: 0;
  animation: fade-in .9s ease forwards;
  animation-delay: .6s;
}
@keyframes fade-in {
  to { opacity: .92; }
}

/* --- curved photo band --- */
.hero-band {
  position: relative;
  flex: 1 1 auto;
  max-width: 640px;
  height: clamp(220px, 32vw, 380px);
  display: flex;
  align-items: center;
  perspective: 1400px;
  opacity: 0;
  animation: fade-in-band 1s ease forwards;
  animation-delay: .5s;
}
@keyframes fade-in-band {
  to { opacity: 1; }
}
.band-item {
  flex: 1 0 22%;
  height: 82%;
  margin-left: -3%;
  border-radius: 2px;
  box-shadow: 0 20px 40px rgba(0, 0, 0, .35);
  transform-style: preserve-3d;
}
.band-1 {
  height: 68%;
  background: linear-gradient(150deg, #3d4f78 0%, #202f4d 100%);
  transform: rotateY(34deg) translateZ(-50px) translateY(6%) scale(.86);
  opacity: .8;
  z-index: 1;
}
.band-2 {
  height: 78%;
  background: linear-gradient(150deg, #56698f 0%, #283a5c 100%);
  transform: rotateY(20deg) translateZ(-15px) translateY(2%) scale(.94);
  z-index: 2;
}
.band-3 {
  height: 90%;
  background: linear-gradient(160deg, #8797b3 0%, #354765 100%);
  transform: rotateY(6deg) translateZ(15px) scale(1.02);
  z-index: 3;
}
.band-4 {
  height: 100%;
  background: linear-gradient(190deg, #4d70a3 0%, #1d2c48 100%);
  transform: rotateY(-8deg) translateZ(35px) translateY(-2%) scale(1.08);
  z-index: 4;
}
.band-5 {
  height: 96%;
  background: linear-gradient(200deg, #9fd0ec 0%, #35577c 60%, #1c2b47 100%);
  transform: rotateY(-18deg) translateZ(55px) translateY(-3%) scale(1.14);
  z-index: 5;
  box-shadow: 0 25px 55px rgba(0, 0, 0, .45);
}

/* --- business labels row --- */
.hero-businesses {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: clamp(12px, 3vw, 24px);
  margin-top: clamp(28px, 5vw, 48px);
  padding: 0 clamp(20px, 4vw, 48px);
}
.biz-group {
  display: flex;
  flex-direction: column;
  gap: 3px;
}
.biz-group span {
  font-family: var(--font-en);
  font-size: 9.5px;
  font-weight: 400;
  letter-spacing: .01em;
  color: var(--c-white);
  opacity: .55;
  white-space: nowrap;
}

/* ===== Responsive ===== */
@media screen and (max-width: 1023px) {
  .site-nav { display: none; }
  .hamburger { display: flex; }
  .hero-inner { flex-direction: column; align-items: flex-start; }
  .hero-band {
    width: 100%;
    max-width: 100%;
    height: clamp(180px, 50vw, 260px);
    margin-top: clamp(24px, 6vw, 40px);
  }
}

@media screen and (max-width: 767px) {
  .cta-btn { padding: 9px 14px; font-size: 11.5px; }
  .hero-businesses { flex-wrap: wrap; }
  .biz-group span { font-size: 8.5px; }
}

@media screen and (max-width: 480px) {
  .hero-businesses { display: none; }
}