/* --- Variables --- */
:root {
  --c-navy: #0b1c3c;
  --c-navy-light: #1a3a6e;
  --c-cyan: #00d4ff;
  --c-cyan-light: #e0faff;
  --c-gold: #d4af37;
  --c-gold-light: #f4d160;
  --c-white: #ffffff;
  --c-bg: #f8fbff;
  --c-text: #333;
  --c-text-gray: #666;
  --f-jp: "Noto Sans JP", sans-serif;
  --f-en: "Montserrat", sans-serif;
  --ease-out: cubic-bezier(0.25, 1, 0.5, 1);
}

/* --- Reset & Base --- */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: auto;
  font-size: 16px;
}

@media (max-width: 1200px) {
  html {
    font-size: 1.3311148087vw;
  }
}

@media (max-width: 768px) {
  html {
    font-size: 4.1025641026vw;
  }
}

body {
  font-family: var(--f-jp);
  color: var(--c-navy);
  background: var(--c-white);
  line-height: 1.8;
  overflow-x: hidden;
  opacity: 0;
}

body.loaded {
  opacity: 1;
  transition: opacity 0.5s;
}

a {
  text-decoration: none;
  color: inherit;
  transition: 0.3s;
}

img {
  width: 100%;
  height: auto;
  display: block;
}

ul {
  list-style: none;
}

.pc-only {
  display: block;
}
.sp-only {
  display: block;
}

@media (max-width: 768px) {
  .pc-only {
    display: none;
  }
  .sp-only {
    display: none;
  }
}

/* --- Components --- */
.container {
  width: 90%;
  max-width: 80rem;
  margin: 0 auto;
  position: relative;
}

.bg-text {
  font-family: var(--f-en);
  font-weight: 900;
  color: rgba(11, 28, 60, 0.08);
  position: absolute;
  z-index: 0;
  line-height: 0.8;
  pointer-events: none;
  white-space: nowrap;
}

.btn-circle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  padding: 1.25rem 3rem;
  background: linear-gradient(
    135deg,
    var(--c-navy) 0%,
    var(--c-navy-light) 100%
  );
  color: var(--c-white);
  font-family: var(--f-en);
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: 0.1em;
  position: relative;
  border: none;
  border-radius: 3.125rem;
  z-index: 10;
  cursor: pointer;
  overflow: hidden;
  text-align: center;
  box-shadow: 0 0.5rem 2rem rgba(11, 28, 60, 0.3);
  transition: all 0.4s cubic-bezier(0.25, 1, 0.5, 1);
}

.btn-circle::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    135deg,
    var(--c-cyan) 0%,
    var(--c-navy-light) 100%
  );
  opacity: 0;
  transition: opacity 0.4s;
  z-index: -1;
}

.btn-circle::after {
  content: "→";
  font-size: 1.2rem;
  transition: transform 0.4s;
}

.btn-circle:hover {
  transform: translateY(-0.25rem);
  box-shadow: 0 1rem 3rem rgba(11, 28, 60, 0.4);
}

.btn-circle:hover::before {
  opacity: 1;
}

.btn-circle:hover::after {
  transform: translateX(0.25rem);
}

/* Section Headers */
.sec-header {
  margin-bottom: 4rem;
  position: relative;
  z-index: 2;
}

.sec-header.center {
  text-align: center;
}

.sec-header.center .sec-jp {
  margin-left: 0;
  display: block;
  margin-top: 0.5rem;
}

.sec-en {
  font-family: var(--f-en);
  font-size: 2.5rem;
  font-weight: 900;
  color: #000;
  line-height: 1;
}

/* 先頭文字のスタイル */
.sec-en::first-letter {
  font-size: 3.5rem;
  color: var(--c-cyan);
}

.sec-jp {
  font-size: 0.9rem;
  color: var(--c-cyan);
  font-weight: 700;
  margin-left: 0.5rem;
  letter-spacing: 0.1em;
}

/* --- Header --- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  padding: 1.5rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: 0.4s;
  mix-blend-mode: exclusion;
  color: #fff;
}

.header.scrolled {
  padding: 1rem 2rem;
  background: rgba(255, 255, 255, 0.95);
  mix-blend-mode: normal;
  color: var(--c-navy);
  box-shadow: 0 0.125rem 1.25rem rgba(0, 0, 0, 0.05);
}

.logo {
  display: flex;
  align-items: center;
  height: 2.5rem;
  opacity: 0;
  transition: opacity 0.4s;
}

.header.scrolled .logo {
  opacity: 1;
}

.logo img {
  height: 100%;
  width: auto;
}

/* Header Navigation (PC) */
.header-nav {
  display: flex;
  align-items: center;
  opacity: 0;
  transition: opacity 0.4s;
}

.header.scrolled .header-nav {
  opacity: 1;
}

.header-nav-list {
  display: flex;
  gap: 2.5rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.header-nav-list a {
  font-family: var(--f-en);
  font-weight: 700;
  font-size: 0.9rem;
  letter-spacing: 0.1em;
  color: inherit;
  text-decoration: none;
  transition: color 0.3s;
}

.header-nav-list a:hover {
  color: var(--c-cyan);
}

/* Dropdown Menu (PC) */
.header-nav-list .has-dropdown {
  position: relative;
}

.header-nav-list .has-dropdown > a {
  position: relative;
  padding-right: 1.2rem;
}

.header-nav-list .has-dropdown > a::after {
  content: "▼";
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  font-size: 0.6rem;
  margin-left: 0.5rem;
  transition: transform 0.3s ease;
}

.header-nav-list .has-dropdown:hover > a::after {
  transform: translateY(-50%) rotate(180deg);
}

.dropdown-menu {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  margin-top: 1.5rem;
  background: #fff;
  border-radius: 8px;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.15);
  list-style: none;
  padding: 1rem 0;
  min-width: 220px;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
  z-index: 1000;
}

.has-dropdown:hover .dropdown-menu {
  opacity: 1;
  visibility: visible;
  margin-top: 1rem;
}

.dropdown-menu li {
  margin: 0;
}

.dropdown-menu a {
  display: flex;
  flex-direction: column;
  padding: 1rem 1.5rem;
  padding-right: 3rem;
  color: var(--c-navy);
  text-decoration: none;
  transition: all 0.3s ease;
  border-left: 3px solid transparent;
  position: relative;
}

.dropdown-menu a::after {
  content: "→";
  position: absolute;
  right: 1.5rem;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.2rem;
  color: #ccc;
  transition: all 0.3s ease;
}

.dropdown-menu a:hover {
  background: #f8f9fa;
  border-left-color: var(--c-cyan);
  color: var(--c-navy);
}

.dropdown-menu a:hover::after {
  color: var(--c-cyan);
  right: 1.2rem;
}

.dropdown-title {
  font-family: 'Noto Sans JP', sans-serif;
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 0.3rem;
  color: var(--c-navy);
}

.dropdown-subtitle {
  font-family: var(--f-en);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  color: #999;
}

.dropdown-menu a:hover .dropdown-title {
  color: var(--c-cyan);
}

.menu-trigger {
  display: none;
  align-items: center;
  gap: 1rem;
  cursor: pointer;
}

.menu-text {
  font-family: var(--f-en);
  font-weight: 700;
  font-size: 0.9rem;
  letter-spacing: 0.1em;
}

.hamburger {
  width: 2.5rem;
  height: 0.75rem;
  position: relative;
}

.hamburger span {
  position: absolute;
  left: 0;
  width: 100%;
  height: 0.125rem;
  background: currentColor;
  transition: 0.3s;
}

.hamburger span:nth-child(1) {
  top: 0;
}

.hamburger span:nth-child(2) {
  bottom: 0;
  width: 70%;
  margin-left: 30%;
}

.menu-trigger:hover .hamburger span:nth-child(2) {
  width: 100%;
  margin-left: 0;
}

/* --- Navigation Menu --- */
.nav-menu {
  position: fixed;
  top: 0;
  right: -100%;
  width: 100%;
  height: 100vh;
  background: var(--c-navy);
  z-index: 200;
  transition: right 0.5s cubic-bezier(0.25, 1, 0.5, 1);
  overflow-y: auto;
}

.nav-menu.active {
  right: 0;
}

.nav-menu-inner {
  min-height: 100vh;
  padding: 2rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.nav-menu-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 4rem;
}

.nav-menu-header .logo {
  opacity: 1;
}

.nav-menu-header .logo img {
  filter: brightness(0) invert(1);
}

.menu-close {
  width: 2.5rem;
  height: 2.5rem;
  position: relative;
  cursor: pointer;
}

.menu-close span {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 100%;
  height: 0.125rem;
  background: #fff;
  transition: 0.3s;
}

.menu-close span:nth-child(1) {
  transform: translate(-50%, -50%) rotate(45deg);
}

.menu-close span:nth-child(2) {
  transform: translate(-50%, -50%) rotate(-45deg);
}

.menu-close:hover span {
  background: var(--c-cyan);
}

.nav-menu-list {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 2rem;
}

.nav-menu-list li {
  opacity: 0;
  transform: translateX(3rem);
  transition: all 0.5s cubic-bezier(0.25, 1, 0.5, 1);
}

.nav-menu.active .nav-menu-list li {
  opacity: 1;
  transform: translateX(0);
}

.nav-menu-list li:nth-child(1) {
  transition-delay: 0.1s;
}
.nav-menu-list li:nth-child(2) {
  transition-delay: 0.15s;
}
.nav-menu-list li:nth-child(3) {
  transition-delay: 0.2s;
}
.nav-menu-list li:nth-child(4) {
  transition-delay: 0.25s;
}
.nav-menu-list li:nth-child(5) {
  transition-delay: 0.3s;
}
.nav-menu-list li:nth-child(6) {
  transition-delay: 0.35s;
}
.nav-menu-list li:nth-child(7) {
  transition-delay: 0.4s;
}

.nav-menu-list a {
  font-family: var(--f-en);
  font-size: 3.5rem;
  font-weight: 900;
  color: #fff;
  display: inline-block;
  position: relative;
  transition: 0.3s;
}

.nav-menu-list a::after {
  content: "";
  position: absolute;
  bottom: 0.5rem;
  left: 0;
  width: 0;
  height: 0.25rem;
  background: var(--c-cyan);
  transition: width 0.3s;
}

.nav-menu-list a:hover {
  color: var(--c-cyan);
}

.nav-menu-list a:hover::after {
  width: 100%;
}

/* Mobile Submenu */
.nav-menu-list .has-submenu {
  display: flex;
  flex-direction: column;
}

.nav-menu-list .submenu-trigger {
  cursor: pointer;
  pointer-events: none;
}

.nav-menu-list .submenu {
  list-style: none;
  padding: 0;
  margin: 1.5rem 0 0 2rem;
  max-height: none;
  overflow: visible;
}

.nav-menu-list .submenu li {
  opacity: 1;
  transform: translateX(0);
  margin-bottom: 1.5rem;
  transition: none;
}

.nav-menu-list .submenu a {
  font-size: 1.8rem;
  font-weight: 700;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.nav-menu-list .submenu a::after {
  display: none;
}

.submenu-title {
  font-family: 'Noto Sans JP', sans-serif;
  font-size: 1.8rem;
  font-weight: 700;
  color: #fff;
}

.submenu-subtitle {
  font-family: var(--f-en);
  font-size: 0.9rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  color: rgba(255, 255, 255, 0.6);
}

.nav-menu-list .submenu a:hover .submenu-title {
  color: var(--c-cyan);
}

.nav-menu-footer {
  color: rgba(255, 255, 255, 0.6);
  font-size: 0.9rem;
  line-height: 1.8;
  margin-top: 3rem;
}

/* --- Hero --- */
.hero {
  height: 100vh;
  position: relative;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: #fff;
}

.hero-visual {
  position: absolute;
  top: 0;
  right: 0;
  width: 55%;
  height: 100%;
  clip-path: polygon(20% 0, 100% 0, 100% 100%, 0% 100%);
  z-index: 1;
  background: linear-gradient(135deg, #0b1c3c 0%, #1a3a6e 100%);
}

.hero-visual::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(45deg, rgba(11, 28, 60, 0.3), transparent);
  pointer-events: none;
  z-index: 4;
}

#particle-rain-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
  opacity: 0.6;
}

/* 螺旋スライダー */
.spiral-slider {
  position: absolute;
  top: 70%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
  opacity: 1;
  filter: contrast(1.1) brightness(0.95);
  perspective: 2000px;
  perspective-origin: 50% 50%;
}

.spiral-track {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 100%;
  height: 100%;
  transform-style: preserve-3d;
  animation: spiral3DRise 120s linear infinite;
}

@keyframes spiral3DRise {
  0% {
    transform: translate(-50%, -50%) rotateY(0deg) rotateX(0deg);
  }
  100% {
    transform: translate(-50%, -50%) rotateY(360deg) rotateX(0deg);
  }
}

.spiral-item {
  position: absolute;
  left: 50%;
  top: 0;
  width: 15rem;
  height: 18rem;
  margin-left: -4.5rem;
  overflow: hidden;
  box-shadow: 0 0.75rem 2rem rgba(0, 0, 0, 0.5),
    0 0 1.5rem rgba(0, 212, 255, 0.3);
  transition: all 0.4s cubic-bezier(0.25, 1, 0.5, 1);
  border: 1px solid rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(5px);
  transform-style: preserve-3d;
}

.spiral-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: all 0.4s;
}

/* グラデーションオーバーレイ */
.spiral-item::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    135deg,
    rgba(11, 28, 60, 0.5) 0%,
    rgba(0, 212, 255, 0.25) 50%,
    rgba(212, 175, 55, 0.2) 100%
  );
  pointer-events: none;
  transition: opacity 0.4s;
  z-index: 1;
}

.spiral-item:hover::after {
  background: linear-gradient(
    135deg,
    rgba(11, 28, 60, 0.3) 0%,
    rgba(0, 212, 255, 0.4) 50%,
    rgba(212, 175, 55, 0.3) 100%
  );
}

/* 3D 奥行きによる明暗効果 */
.spiral-item::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(
    circle at 50% 50%,
    transparent 0%,
    rgba(0, 0, 0, 0.3) 100%
  );
  pointer-events: none;
  z-index: 2;
}

.spiral-item:hover {
  box-shadow: 0 2rem 5rem rgba(0, 0, 0, 0.7), 0 0 3rem rgba(0, 212, 255, 0.6),
    0 0 4rem rgba(212, 175, 55, 0.4);
  border-color: rgba(0, 212, 255, 0.5);
}

.spiral-item:hover img {
  transform: scale(1.1);
}

/* 3D螺旋階段配置 - 円周上に配置、その場で回転 */
/* 螺旋状に高さを変えて配置、幅を広げて大きな円、縦位置を少しずつずらす */
/* 1周目 (1-6) - 間隔を広げて調整 */
.spiral-item:nth-child(1) {
  transform: rotateY(0deg) translateZ(20rem) translateY(-70%) rotateX(5deg);
}
.spiral-item:nth-child(2) {
  transform: rotateY(60deg) translateZ(20rem) translateY(-50%) rotateX(5deg);
}
.spiral-item:nth-child(3) {
  transform: rotateY(120deg) translateZ(20rem) translateY(-25%) rotateX(5deg);
}
.spiral-item:nth-child(4) {
  transform: rotateY(180deg) translateZ(20rem) translateY(0%) rotateX(5deg);
}
.spiral-item:nth-child(5) {
  transform: rotateY(240deg) translateZ(20rem) translateY(25%) rotateX(5deg);
}
.spiral-item:nth-child(6) {
  transform: rotateY(300deg) translateZ(20rem) translateY(50%) rotateX(5deg);
}
/* 2周目 (7-12) - 間隔を広げて調整 */
.spiral-item:nth-child(7) {
  transform: rotateY(0deg) translateZ(20rem) translateY(80%) rotateX(5deg);
}
.spiral-item:nth-child(8) {
  transform: rotateY(60deg) translateZ(20rem) translateY(105%) rotateX(5deg);
}
.spiral-item:nth-child(9) {
  transform: rotateY(120deg) translateZ(20rem) translateY(135%) rotateX(5deg);
}
.spiral-item:nth-child(10) {
  transform: rotateY(180deg) translateZ(20rem) translateY(160%) rotateX(5deg);
}
.spiral-item:nth-child(11) {
  transform: rotateY(240deg) translateZ(20rem) translateY(190%) rotateX(5deg);
}
.spiral-item:nth-child(12) {
  transform: rotateY(300deg) translateZ(20rem) translateY(215%) rotateX(5deg);
}
/* 3周目 (13-18) - 間隔を広げて調整 */
.spiral-item:nth-child(13) {
  transform: rotateY(0deg) translateZ(20rem) translateY(245%) rotateX(5deg);
}
.spiral-item:nth-child(14) {
  transform: rotateY(60deg) translateZ(20rem) translateY(270%) rotateX(5deg);
}
.spiral-item:nth-child(15) {
  transform: rotateY(120deg) translateZ(20rem) translateY(300%) rotateX(5deg);
}
.spiral-item:nth-child(16) {
  transform: rotateY(180deg) translateZ(20rem) translateY(325%) rotateX(5deg);
}
.spiral-item:nth-child(17) {
  transform: rotateY(240deg) translateZ(20rem) translateY(355%) rotateX(5deg);
}
.spiral-item:nth-child(18) {
  transform: rotateY(300deg) translateZ(20rem) translateY(380%) rotateX(5deg);
}

/* 浮遊アニメーション - 奥行きも変化 */
.spiral-item {
  animation: spiral3DFloat 8s ease-in-out infinite,
    spiralOpacity 120s linear infinite;
}

.spiral-item:nth-child(odd) {
  animation-delay: 0s, var(--opacity-delay, 0s);
}

.spiral-item:nth-child(even) {
  animation-delay: -4s, var(--opacity-delay, 0s);
}

@keyframes spiral3DFloat {
  0%,
  100% {
    transform: rotateY(var(--rotate-y, 0deg))
      translateZ(var(--translate-z, 20rem)) translateY(var(--translate-y, 0%))
      rotateX(5deg) scale(1);
  }
  50% {
    transform: rotateY(var(--rotate-y, 0deg))
      translateZ(calc(var(--translate-z, 20rem) + 1rem))
      translateY(var(--translate-y, 0%)) rotateX(5deg) scale(1.05);
  }
}

/* 前面に来たときだけ不透明で鮮やかになるアニメーション */
@keyframes spiralOpacity {
  0%,
  100% {
    opacity: 1;
    filter: brightness(1.1) contrast(1.15) saturate(1.4);
  }
  12.5% {
    opacity: 0.6;
    filter: brightness(0.8) contrast(1.1) saturate(1.1);
  }
  25% {
    opacity: 0.3;
    filter: brightness(0.6) contrast(1.05) saturate(0.9);
  }
  37.5% {
    opacity: 0.3;
    filter: brightness(0.5) contrast(1.05) saturate(0.8);
  }
  50% {
    opacity: 0.3;
    filter: brightness(0.5) contrast(1.05) saturate(0.8);
  }
  62.5% {
    opacity: 0.3;
    filter: brightness(0.5) contrast(1.05) saturate(0.8);
  }
  75% {
    opacity: 0.4;
    filter: brightness(0.7) contrast(1.1) saturate(1);
  }
  87.5% {
    opacity: 0.7;
    filter: brightness(0.9) contrast(1.12) saturate(1.2);
  }
}

/* 各アイテムの初期角度と高さ、幅をカスタムプロパティで設定 */
.spiral-item:nth-child(1) {
  --rotate-y: 0deg;
  --translate-y: -70%;
  --translate-z: 20rem;
  --opacity-delay: 0s;
}
.spiral-item:nth-child(2) {
  --rotate-y: 60deg;
  --translate-y: -50%;
  --translate-z: 20rem;
  --opacity-delay: -20s;
}
.spiral-item:nth-child(3) {
  --rotate-y: 120deg;
  --translate-y: -25%;
  --translate-z: 20rem;
  --opacity-delay: -40s;
}
.spiral-item:nth-child(4) {
  --rotate-y: 180deg;
  --translate-y: 0%;
  --translate-z: 20rem;
  --opacity-delay: -60s;
}
.spiral-item:nth-child(5) {
  --rotate-y: 240deg;
  --translate-y: 25%;
  --translate-z: 20rem;
  --opacity-delay: -80s;
}
.spiral-item:nth-child(6) {
  --rotate-y: 300deg;
  --translate-y: 50%;
  --translate-z: 20rem;
  --opacity-delay: -100s;
}
.spiral-item:nth-child(7) {
  --rotate-y: 0deg;
  --translate-y: 80%;
  --translate-z: 20rem;
  --opacity-delay: 0s;
}
.spiral-item:nth-child(8) {
  --rotate-y: 60deg;
  --translate-y: 105%;
  --translate-z: 20rem;
  --opacity-delay: -20s;
}
.spiral-item:nth-child(9) {
  --rotate-y: 120deg;
  --translate-y: 135%;
  --translate-z: 20rem;
  --opacity-delay: -40s;
}
.spiral-item:nth-child(10) {
  --rotate-y: 180deg;
  --translate-y: 160%;
  --translate-z: 20rem;
  --opacity-delay: -60s;
}
.spiral-item:nth-child(11) {
  --rotate-y: 240deg;
  --translate-y: 190%;
  --translate-z: 20rem;
  --opacity-delay: -80s;
}
.spiral-item:nth-child(12) {
  --rotate-y: 300deg;
  --translate-y: 215%;
  --translate-z: 20rem;
  --opacity-delay: -100s;
}
.spiral-item:nth-child(13) {
  --rotate-y: 0deg;
  --translate-y: 245%;
  --translate-z: 20rem;
  --opacity-delay: 0s;
}
.spiral-item:nth-child(14) {
  --rotate-y: 60deg;
  --translate-y: 270%;
  --translate-z: 20rem;
  --opacity-delay: -20s;
}
.spiral-item:nth-child(15) {
  --rotate-y: 120deg;
  --translate-y: 300%;
  --translate-z: 20rem;
  --opacity-delay: -40s;
}
.spiral-item:nth-child(16) {
  --rotate-y: 180deg;
  --translate-y: 325%;
  --translate-z: 20rem;
  --opacity-delay: -60s;
}
.spiral-item:nth-child(17) {
  --rotate-y: 240deg;
  --translate-y: 355%;
  --translate-z: 20rem;
  --opacity-delay: -80s;
}
.spiral-item:nth-child(18) {
  --rotate-y: 300deg;
  --translate-y: 380%;
  --translate-z: 20rem;
  --opacity-delay: -100s;
}

.hero-content {
  width: 50%;
  padding-left: 5%;
  position: relative;
  z-index: 2;
}

.hero-eyebrow {
  font-family: var(--f-en);
  color: var(--c-cyan);
  font-weight: 700;
  margin-bottom: 1.5rem;
  display: block;
  letter-spacing: 0.2em;
}

.hero-title {
  font-family: var(--f-en);
  font-size: 4.5rem;
  font-weight: 900;
  line-height: 1;
  margin-bottom: 2rem;
  letter-spacing: -0.02em;
  color: var(--c-navy);
}

.hero-title span {
  display: block;
  -webkit-text-stroke: 0.0625rem var(--c-navy);
  color: transparent;
}

.hero-title span.filled {
  color: var(--c-navy);
  -webkit-text-stroke: 0;
}

.hero-jp {
  font-size: 1.1rem;
  font-weight: 500;
  margin-bottom: 3rem;
  letter-spacing: 0.1em;
  padding: 1rem 0;
  display: inline-block;
  color: var(--c-navy);
}

/* --- Marquee --- */
.marquee {
  width: 100%;
  overflow: hidden;
  background: var(--c-navy);
  color: var(--c-white);
  padding: 1rem 0;
  white-space: nowrap;
  display: flex;
  position: relative;
  z-index: 5;
}

.marquee-inner {
  display: flex;
  width: max-content;
}

.marquee-item {
  font-family: var(--f-en);
  font-weight: 700;
  font-size: 1.2rem;
  padding: 0 3rem;
  display: flex;
  align-items: center;
}

.marquee-item::after {
  content: "+";
  color: var(--c-cyan);
  margin-left: 3rem;
}

/* --- Advanced Concept Section --- */
.adv-section {
  padding: 10rem 0;
  background: #f8fbff;
  position: relative;
  overflow: hidden;
}

.adv-bg-title {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-family: var(--f-en);
  font-weight: 900;
  font-size: 15vw;
  line-height: 0.8;
  color: #fff;
  text-align: center;
  z-index: 0;
  text-shadow: 0 0 50px rgba(0, 212, 255, 0.1);
}

.adv-container {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 4rem;
}

.orb-wrapper {
  position: relative;
  width: 31.25rem;
  height: 18.75rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

.orb {
  width: 17.5rem;
  height: 17.5rem;
  border-radius: 50%;
  position: absolute;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: #fff;
  text-align: center;
}

.orb.left {
  background: linear-gradient(135deg, #00d4ff, #0088cc);
  left: 0;
  z-index: 2;
  box-shadow: 0 1.25rem 3.125rem rgba(0, 212, 255, 0.4);
  mix-blend-mode: multiply;
}

.orb.right {
  background: linear-gradient(135deg, #0b1c3c, #1a3a6e);
  right: 0;
  z-index: 1;
  box-shadow: 0 1.25rem 3.125rem rgba(11, 28, 60, 0.4);
}

.orb-icon {
  font-size: 3rem;
  margin-bottom: 0.5rem;
}

.orb-title {
  font-family: var(--f-en);
  font-weight: 700;
  font-size: 1.5rem;
}

.orb-sub {
  font-size: 0.9rem;
  font-weight: 500;
  opacity: 0.9;
  margin-top: 0.3125rem;
}

.orb-glow {
  position: absolute;
  width: 6.25rem;
  height: 6.25rem;
  background: #fff;
  filter: blur(2.5rem);
  z-index: 3;
  opacity: 0.8;
}

.adv-desc {
  max-width: 32rem;
}

.adv-labels {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  margin-bottom: 1.5rem;
}

.adv-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--c-navy);
  letter-spacing: 0.05em;
}

.adv-label-divider {
  color: var(--c-cyan);
  font-weight: 300;
}

.adv-lead {
  font-size: 1.8rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  line-height: 1.5;
  color: var(--c-navy);
  letter-spacing: 0.02em;
}

.adv-desc p {
  margin-bottom: 2rem;
  line-height: 1.8;
  color: #666;
}

.adv-view-more {
  display: inline-flex;
  align-items: center;
  gap: 0.8rem;
  padding: 1rem 2.5rem;
  background: var(--c-navy);
  color: #fff;
  font-family: var(--f-en);
  font-weight: 700;
  font-size: 0.9rem;
  letter-spacing: 0.05em;
  border-radius: 50px;
  text-decoration: none;
  transition: all 0.3s cubic-bezier(0.25, 1, 0.5, 1);
  box-shadow: 0 4px 15px rgba(11, 28, 60, 0.2);
  border: 2px solid var(--c-navy);
}

.adv-view-more:hover {
  background: transparent;
  color: var(--c-navy);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(11, 28, 60, 0.15);
}

.view-more-arrow {
  font-size: 1.2rem;
  transition: transform 0.3s;
}

.adv-view-more:hover .view-more-arrow {
  transform: translateX(5px);
}

/* --- Services (Stagger & Details) --- */
/* --- Service Section --- */
.service-section {
  padding: 0;
  background: linear-gradient(135deg, #0a1b38 0%, #0b1c3c 50%, #0d1e40 100%);
  position: relative;
  width: 100vw;
  margin-left: calc(50% - 50vw);
}

.service-section::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: radial-gradient(
      circle at 20% 50%,
      rgba(0, 212, 255, 0.03) 0%,
      transparent 50%
    ),
    radial-gradient(
      circle at 80% 50%,
      rgba(212, 175, 55, 0.03) 0%,
      transparent 50%
    );
  pointer-events: none;
  z-index: 0;
}

.service-section::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: repeating-linear-gradient(
    90deg,
    transparent,
    transparent 100px,
    rgba(255, 255, 255, 0.01) 100px,
    rgba(255, 255, 255, 0.01) 101px
  );
  pointer-events: none;
  z-index: 0;
}

.service-container-full {
  max-width: 100%;
  padding: 8rem 0 0;
  position: relative;
  z-index: 1;
}

.service-section .sec-header {
  text-align: center;
  margin-bottom: 5rem;
  padding: 0 2rem;
}

.service-section .sec-en {
  color: #fff;
}

.service-section .sec-en::first-letter {
  color: var(--c-cyan);
}

.service-section .sec-jp {
  color: var(--c-cyan);
}

.service-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  width: 100%;
}

.service-card {
  position: relative;
  overflow: hidden;
  min-height: 600px;
  cursor: pointer;
  transition: all 0.5s cubic-bezier(0.25, 1, 0.5, 1);
}

.service-card-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-size: cover;
  background-position: center;
  transition: transform 0.8s cubic-bezier(0.25, 1, 0.5, 1);
  z-index: 0;
}

.service-card:hover .service-card-bg {
  transform: scale(1.1);
}

.service-card-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    180deg,
    rgba(11, 28, 60, 0.5) 0%,
    rgba(11, 28, 60, 0.9) 100%
  );
  z-index: 1;
  transition: background 0.5s;
}

.service-card:hover .service-card-overlay {
  background: linear-gradient(
    180deg,
    rgba(0, 212, 255, 0.3) 0%,
    rgba(11, 28, 60, 0.95) 100%
  );
}

.service-card-content {
  position: relative;
  z-index: 2;
  padding: 3rem 2.5rem;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  color: #fff;
}

/* Default State - Visible by default */
.service-card-default {
  opacity: 1;
  transform: translateY(0);
  transition: opacity 0.5s, transform 0.5s;
}

.service-card:hover .service-card-default {
  opacity: 0;
  transform: translateY(-20px);
  pointer-events: none;
}

/* Details State - Hidden by default */
.service-card-details {
  position: absolute;
  bottom: 3rem;
  left: 2.5rem;
  right: 2.5rem;
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s, transform 0.5s;
  pointer-events: none;
}

.service-card:hover .service-card-details {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.service-card-title {
  font-family: var(--f-en);
  font-size: 2.5rem;
  font-weight: 900;
  margin-bottom: 0.5rem;
  letter-spacing: 0.05em;
  line-height: 1;
}

.service-card-subtitle {
  font-size: 0.9rem;
  font-weight: 500;
  margin-bottom: 1.5rem;
  letter-spacing: 0.1em;
  opacity: 0.9;
}

.service-card-link {
  font-family: var(--f-en);
  font-size: 0.9rem;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: #fff;
  text-decoration: none;
  transition: gap 0.3s;
}

.service-card:hover .service-card-link {
  gap: 1rem;
}

.service-card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}

.service-card-tags span {
  font-size: 0.75rem;
  padding: 0.4rem 0.9rem;
  background: rgba(0, 212, 255, 0.15);
  border: 1px solid rgba(0, 212, 255, 0.4);
  border-radius: 1.5rem;
  color: var(--c-cyan);
  font-weight: 600;
  letter-spacing: 0.05em;
}

.service-card-desc {
  font-size: 0.95rem;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.95);
}

/* --- Works --- */
.works-section {
  padding: 8rem 0;
  background: #f8fbff;
  position: relative;
}

.works-section .sec-header {
  margin-bottom: 3rem;
}

/* Category Tabs */
.works-tabs {
  display: flex;
  justify-content: flex-start;
  align-items: center;
  gap: 0.8rem;
  margin-bottom: 4rem;
  flex-wrap: wrap;
}

.works-tabs::before {
  content: "カテゴリーから探す";
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--c-navy);
  margin-right: 1.5rem;
  white-space: nowrap;
}

.works-tab {
  font-size: 0.9rem;
  font-weight: 600;
  padding: 0.9rem 1.8rem;
  border: none;
  background: #2a2a2a;
  color: #fff;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.25, 1, 0.5, 1);
  letter-spacing: 0.02em;
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.works-tab::before {
  content: "";
  width: 8px;
  height: 8px;
  background: var(--c-cyan);
  border-radius: 2px;
  display: inline-block;
}

.works-tab:hover {
  background: #3a3a3a;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.works-tab.active {
  background: var(--c-cyan);
  color: #fff;
}

.works-tab.active::before {
  background: #fff;
}

/* Works Grid */
.works-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 3rem;
}

.work-item {
  position: relative;
  cursor: pointer;
  transition: all 0.4s cubic-bezier(0.25, 1, 0.5, 1);
}

.work-item:hover {
  transform: translateY(-8px);
}

/* Browser Frame */
.work-browser-frame {
  background: #fff;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.12);
  transition: box-shadow 0.4s;
  margin-bottom: 1.5rem;
}

.work-item:hover .work-browser-frame {
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.18);
}

/* Browser Header */
.browser-header {
  background: #f5f5f5;
  padding: 0.8rem 1rem;
  border-bottom: 1px solid #e0e0e0;
}

.browser-dots {
  display: none;
}

/* Work Image Container */
.work-image-container {
  position: relative;
  overflow: hidden;
  padding-bottom: 65%;
  background: #f0f0f0;
}

.work-image-container img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s cubic-bezier(0.25, 1, 0.5, 1);
}

.work-item:hover .work-image-container img {
  transform: scale(1.05);
}

/* Work Overlay - Hover Effect */
.work-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(11, 28, 60, 0.85);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transform: scale(0);
  transition: opacity 0.5s ease, transform 0.5s cubic-bezier(0.25, 1, 0.5, 1);
  z-index: 2;
  border-radius: 50%;
}

.work-item:hover .work-overlay {
  opacity: 1;
  transform: scale(1.5);
  border-radius: 0;
}

.work-company-name {
  font-size: 1rem;
  font-weight: 700;
  color: #fff;
  text-align: center;
  padding: 0 2rem;
  line-height: 1.4;
  letter-spacing: 0.02em;
}

/* Work Info */
.work-info {
  padding: 0;
}

.work-title {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 0.8rem;
  color: var(--c-navy);
  line-height: 1.5;
}

.work-desc {
  font-size: 0.9rem;
  line-height: 1.7;
  color: #666;
  margin: 0;
}

/* Hidden state for filtering */
.work-item.hidden {
  display: none;
}

/* Initially hidden items */
.work-item.work-item-hidden {
  display: none;
}

/* View More Button */
.works-view-more {
  display: flex;
  justify-content: center;
  margin-top: 4rem;
}

.btn-view-more {
  font-family: var(--f-en);
  font-size: 1rem;
  font-weight: 700;
  padding: 1.2rem 3rem;
  background: var(--c-navy);
  color: #fff;
  border: 2px solid var(--c-navy);
  border-radius: 3rem;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.25, 1, 0.5, 1);
  display: inline-flex;
  align-items: center;
  gap: 0.8rem;
  letter-spacing: 0.05em;
}

.btn-view-more:hover {
  background: transparent;
  color: var(--c-navy);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(11, 28, 60, 0.15);
}

.view-more-icon {
  font-size: 1.2rem;
  transition: transform 0.3s;
}

.btn-view-more:hover .view-more-icon {
  transform: translateX(5px);
}

.btn-view-more.hidden {
  display: none;
}

/* Fade In Up Animation */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* --- Guide Section (For First-Time Visitors) --- */
.guide-section {
  padding: 8rem 0;
  background: linear-gradient(135deg, #0b1c3c 0%, #1a3a5c 100%);
  position: relative;
  overflow: hidden;
}

.guide-section::before {
  content: "GUIDE";
  position: absolute;
  top: 50%;
  left: -5%;
  transform: translateY(-50%);
  font-family: var(--f-en);
  font-size: 15vw;
  font-weight: 900;
  color: rgba(255, 255, 255, 0.03);
  line-height: 1;
  pointer-events: none;
  z-index: 0;
}

.guide-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 5rem;
  align-items: center;
  position: relative;
  z-index: 1;
}

.guide-section .sec-en {
  color: #fff;
}

.guide-section .sec-en::first-letter {
  color: var(--c-cyan);
}

.guide-section .sec-jp {
  color: var(--c-cyan);
}

.guide-content {
  color: #fff;
}

.guide-desc {
  font-size: 1rem;
  line-height: 2;
  color: rgba(255, 255, 255, 0.85);
  margin-top: 2.5rem;
  margin-bottom: 3rem;
}

.guide-buttons {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.guide-btn {
  display: inline-flex;
  align-items: center;
  gap: 1rem;
  padding: 1.2rem 2.5rem;
  font-family: var(--f-jp);
  font-weight: 700;
  font-size: 1rem;
  border-radius: 50px;
  text-decoration: none;
  transition: all 0.4s cubic-bezier(0.25, 1, 0.5, 1);
  position: relative;
  overflow: hidden;
  letter-spacing: 0.05em;
}

.guide-btn::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.2);
  transform: translate(-50%, -50%);
  transition: width 0.6s, height 0.6s;
}

.guide-btn:hover::before {
  width: 300px;
  height: 300px;
}

.guide-btn-text {
  position: relative;
  z-index: 1;
}

.guide-btn-arrow {
  position: relative;
  z-index: 1;
  font-size: 1.2rem;
  transition: transform 0.3s;
}

.guide-btn:hover .guide-btn-arrow {
  transform: translateX(5px);
}

.guide-btn-primary {
  background: var(--c-cyan);
  color: #0b1c3c;
  box-shadow: 0 4px 20px rgba(0, 212, 255, 0.3);
}

.guide-btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 30px rgba(0, 212, 255, 0.4);
}

.guide-btn-secondary {
  background: transparent;
  color: #fff;
  border: 2px solid var(--c-cyan);
}

.guide-btn-secondary:hover {
  background: var(--c-cyan);
  color: #0b1c3c;
  transform: translateY(-3px);
  box-shadow: 0 8px 30px rgba(0, 212, 255, 0.3);
}

.guide-image {
  position: relative;
  border-radius: 20px;
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
  transform: perspective(1000px) rotateY(-5deg);
  transition: transform 0.6s cubic-bezier(0.25, 1, 0.5, 1);
}

.guide-image:hover {
  transform: perspective(1000px) rotateY(0deg);
}

.guide-image img {
  width: 100%;
  height: auto;
  display: block;
  transition: transform 0.6s;
}

.guide-image:hover img {
  transform: scale(1.05);
}

/* --- Flow (Timeline) --- */
.flow-section {
  padding: 8rem 0 6rem 0;
  background: #fff;
  position: relative;
}

.flow-section container {
  position: relative;
  z-index: 2;
}

.flow-list {
  position: relative;
  max-width: 50rem;
  margin: 0 auto;
}

.flow-line {
  position: absolute;
  top: 0;
  left: 0;
  width: 0.125rem;
  height: 100%;
  background: #eee;
}

.flow-item {
  margin-bottom: 4rem;
  position: relative;
  padding-left: 3rem;
}

.flow-item:last-child {
  margin-bottom: 0;
}

.flow-marker {
  position: absolute;
  top: 0;
  left: -0.5625rem;
  width: 1.25rem;
  height: 1.25rem;
  background: var(--c-navy);
  border: 0.25rem solid #fff;
  border-radius: 50%;
  box-shadow: 0 0 0 0.125rem var(--c-cyan);
  z-index: 2;
}

.flow-num {
  font-family: var(--f-en);
  font-weight: 900;
  font-size: 3rem;
  color: #eee;
  line-height: 1;
  margin-bottom: 0.5rem;
}

.flow-head {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1rem;
}

.flow-title {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--c-navy);
}

.flow-desc {
  font-size: 0.95rem;
  color: var(--c-text-gray);
  line-height: 1.8;
}

/* --- News Section --- */
.news-section {
  padding: 12rem 0 8rem 0;
  background: #fff;
  position: relative;
}

.news-list {
  max-width: 56rem;
  margin: 0 auto;
}

.news-item {
  display: block;
  padding: 2rem 0;
  border-bottom: 0.0625rem solid #e8e8e8;
  text-decoration: none;
  color: inherit;
  position: relative;
  transition: all 0.3s cubic-bezier(0.25, 1, 0.5, 1);
}

.news-item:first-child {
  border-top: 0.0625rem solid #e8e8e8;
}

.news-item:hover {
  background: rgba(0, 212, 255, 0.02);
  padding-left: 1rem;
  padding-right: 1rem;
}

.news-meta {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1rem;
}

.news-date {
  font-family: var(--f-en);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--c-text-gray);
  letter-spacing: 0.05em;
}

.news-category {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.4rem 1rem;
  border-radius: 1.5rem;
  letter-spacing: 0.05em;
}

.news-category-info {
  background: rgba(0, 212, 255, 0.1);
  color: var(--c-cyan);
  border: 1px solid rgba(0, 212, 255, 0.3);
}

.news-category-service {
  background: rgba(212, 175, 55, 0.1);
  color: var(--c-gold);
  border: 1px solid rgba(212, 175, 55, 0.3);
}

.news-category-case {
  background: rgba(11, 28, 60, 0.1);
  color: var(--c-navy);
  border: 1px solid rgba(11, 28, 60, 0.2);
}

.news-title {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 0.8rem;
  color: var(--c-navy);
  line-height: 1.5;
  transition: color 0.3s;
}

.news-item:hover .news-title {
  color: var(--c-cyan);
}

.news-excerpt {
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--c-text-gray);
  margin: 0;
  padding-right: 2rem;
}

.news-arrow {
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.5rem;
  color: var(--c-cyan);
  opacity: 0;
  transition: all 0.3s;
}

.news-item:hover .news-arrow {
  opacity: 1;
  right: 1rem;
}

.faq-view-more {
  display: flex;
  justify-content: center;
  margin-top: 4rem;
}

.btn-view-more-faq {
  font-family: var(--f-en);
  font-size: 1rem;
  font-weight: 700;
  padding: 1.2rem 3rem;
  background: var(--c-navy);
  color: #fff;
  border: 2px solid var(--c-navy);
  border-radius: 3rem;
  text-decoration: none;
  transition: all 0.3s cubic-bezier(0.25, 1, 0.5, 1);
  display: inline-flex;
  align-items: center;
  gap: 0.8rem;
  letter-spacing: 0.05em;
}

.btn-view-more-faq:hover {
  background: transparent;
  color: var(--c-navy);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(11, 28, 60, 0.15);
}

.btn-view-more-faq .view-more-icon {
  font-size: 1.2rem;
  transition: transform 0.3s;
}

.btn-view-more-faq:hover .view-more-icon {
  transform: translateX(5px);
}

.news-view-more {
  display: flex;
  justify-content: center;
  margin-top: 4rem;
}

.btn-view-more-news {
  font-family: var(--f-en);
  font-size: 1rem;
  font-weight: 700;
  padding: 1.2rem 3rem;
  background: var(--c-navy);
  color: #fff;
  border: 2px solid var(--c-navy);
  border-radius: 3rem;
  text-decoration: none;
  transition: all 0.3s cubic-bezier(0.25, 1, 0.5, 1);
  display: inline-flex;
  align-items: center;
  gap: 0.8rem;
  letter-spacing: 0.05em;
}

.btn-view-more-news:hover {
  background: transparent;
  color: var(--c-navy);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(11, 28, 60, 0.15);
}

.btn-view-more-news .view-more-icon {
  font-size: 1.2rem;
  transition: transform 0.3s;
}

.btn-view-more-news:hover .view-more-icon {
  transform: translateX(5px);
}

/* --- Footer --- */
/* --- Footer CTA --- */
.footer-cta {
  background: linear-gradient(135deg, #0a1b38 0%, #0b1c3c 50%, #0d1e40 100%);
  color: var(--c-white);
  padding: 8rem 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.footer-cta::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: radial-gradient(
      circle at 30% 50%,
      rgba(0, 212, 255, 0.05) 0%,
      transparent 50%
    ),
    radial-gradient(
      circle at 70% 50%,
      rgba(0, 212, 255, 0.03) 0%,
      transparent 50%
    );
  pointer-events: none;
  z-index: 0;
}

.footer-bg-text {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 15vw;
  font-family: var(--f-en);
  font-weight: 900;
  color: rgba(255, 255, 255, 0.03);
  white-space: nowrap;
  pointer-events: none;
  z-index: 0;
}

.contact-en {
  font-family: var(--f-en);
  font-size: 4rem;
  font-weight: 900;
  display: block;
  margin-bottom: 1rem;
  color: #fff;
  letter-spacing: 0.02em;
}

.contact-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.8rem;
  margin-top: 3rem;
  padding: 1.3rem 4rem;
  background: var(--c-cyan);
  color: var(--c-navy);
  font-weight: 700;
  border-radius: 50px;
  font-size: 1.1rem;
  text-decoration: none;
  transition: all 0.4s cubic-bezier(0.25, 1, 0.5, 1);
  box-shadow: 0 4px 20px rgba(0, 212, 255, 0.3);
  letter-spacing: 0.05em;
}

.contact-btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 30px rgba(0, 212, 255, 0.5);
  background: #00e5ff;
}

/* --- Main Footer --- */
.main-footer {
  background: #0b1c3c;
  color: rgba(255, 255, 255, 0.8);
  padding: 5rem 0 0;
  position: relative;
}

.main-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--c-cyan), transparent);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 4rem;
  margin-bottom: 4rem;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.footer-logo {
  display: block;
  height: 2.5rem;
}

.footer-logo img {
  height: 100%;
  width: auto;
  filter: brightness(0) invert(1);
}

.footer-tagline {
  font-size: 0.95rem;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.6);
  margin: 0;
}

.footer-contact {
  font-size: 0.9rem;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.7);
  margin: 0;
}

.footer-contact a {
  color: var(--c-cyan);
  text-decoration: none;
  transition: color 0.3s;
}

.footer-contact a:hover {
  color: #00e5ff;
}

.footer-col-title {
  font-family: var(--f-en);
  font-weight: 700;
  margin-bottom: 1.5rem;
  font-size: 0.85rem;
  letter-spacing: 0.1em;
  color: var(--c-cyan);
  text-transform: uppercase;
}

.footer-links {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-links li {
  margin-bottom: 0.8rem;
}

.footer-links li a {
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.7);
  text-decoration: none;
  transition: all 0.3s;
  display: inline-block;
}

.footer-links li a:hover {
  color: var(--c-cyan);
  transform: translateX(5px);
}

.footer-social li a {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.footer-social li a i {
  font-size: 1.2rem;
}

.footer-bottom {
  color: rgba(255, 255, 255, 0.6);
  padding: 2rem 0;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  font-size: 0.85rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-copyright {
  font-size: 0.85rem;
}

.footer-legal {
  display: flex;
  gap: 1.5rem;
}

.footer-legal a {
  color: rgba(255, 255, 255, 0.6);
  text-decoration: none;
  transition: color 0.3s;
}

.footer-legal a:hover {
  color: var(--c-cyan);
}

.triangle-wrapper {
  position: relative;
  width: 100%;
  /* 親要素の背景など */
}

.triangle-fixed {
  position: absolute;
  /* 1. サイズの設定 */
  width: 40rem; /* ここで横幅を固定 */
  height: 5rem; /* 横幅の0.866倍にすると正三角形になります */

  /* 2. 中央配置の設定 */
  left: 50%;
  transform: translateX(-50%);

  /* 3. 出現位置の調整 */
  bottom: -10rem; /* 自身の高さ分だけ下に突き出させる */
  z-index: 10;
}

.triangle-fixed svg {
  width: 100%;
  height: 100%;
  display: block;
}

@media (max-width: 768px) {
  .triangle-fixed {
    width: 30%;
    height: 3.125rem;
    bottom: -7rem;
  }
}


/* --- Responsive --- */
@media (max-width: 1200px) and (min-width: 769px) {
  .service-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .service-card {
    min-height: 550px;
  }

  .works-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  /* Hide PC navigation, show mobile menu trigger */
  .header-nav {
    display: none !important;
  }

  .menu-trigger {
    display: flex !important;
    opacity: 0;
    transition: opacity 0.4s;
  }

  .header.scrolled .menu-trigger {
    opacity: 1;
  }

  .nav-menu-list a {
    font-size: 2rem;
  }

  .nav-menu-header {
    margin-bottom: 2rem;
  }

  .hero-title {
    font-size: 2.5rem;
  }

  .hero-visual {
    width: 100%;
    opacity: 0.2;
    clip-path: none;
    position: absolute;
    z-index: 0;
  }

  #particle-canvas {
    opacity: 0.6;
  }

  .hero-content {
    width: 100%;
    padding-left: 0;
    text-align: center;
    padding: 0 1rem;
    z-index: 2;
  }

  .spiral-slider {
    opacity: 1;
    perspective: 1000px;
    top: -30%;
    height: 350%;
  }

  .spiral-item {
    width: 7rem;
    height: 9rem;
    margin-left: -3.5rem;
  }

  /* モバイルでは2周分のみ表示 */
  .spiral-item:nth-child(n + 13) {
    display: none;
  }

  .spiral-item:nth-child(n + 25) {
    display: none;
  }

  /* モバイル用の3D配置調整 - その場で回転、縦位置を少しずつずらす */
  .spiral-item:nth-child(1) {
    --rotate-y: 0deg;
    --translate-y: -58%;
    --translate-z: 14rem;
    --opacity-delay: 0s;
    transform: rotateY(0deg) translateZ(14rem) translateY(-58%) rotateX(5deg);
  }
  .spiral-item:nth-child(2) {
    --rotate-y: 60deg;
    --translate-y: -42%;
    --translate-z: 14rem;
    --opacity-delay: -20s;
    transform: rotateY(60deg) translateZ(14rem) translateY(-42%) rotateX(5deg);
  }
  .spiral-item:nth-child(3) {
    --rotate-y: 120deg;
    --translate-y: -23%;
    --translate-z: 14rem;
    --opacity-delay: -40s;
    transform: rotateY(120deg) translateZ(14rem) translateY(-23%) rotateX(5deg);
  }
  .spiral-item:nth-child(4) {
    --rotate-y: 180deg;
    --translate-y: -3%;
    --translate-z: 14rem;
    --opacity-delay: -60s;
    transform: rotateY(180deg) translateZ(14rem) translateY(-3%) rotateX(5deg);
  }
  .spiral-item:nth-child(5) {
    --rotate-y: 240deg;
    --translate-y: 18%;
    --translate-z: 14rem;
    --opacity-delay: -80s;
    transform: rotateY(240deg) translateZ(14rem) translateY(18%) rotateX(5deg);
  }
  .spiral-item:nth-child(6) {
    --rotate-y: 300deg;
    --translate-y: 37%;
    --translate-z: 14rem;
    --opacity-delay: -100s;
    transform: rotateY(300deg) translateZ(14rem) translateY(37%) rotateX(5deg);
  }
  .spiral-item:nth-child(7) {
    --rotate-y: 0deg;
    --translate-y: 62%;
    --translate-z: 14rem;
    --opacity-delay: 0s;
    transform: rotateY(0deg) translateZ(14rem) translateY(62%) rotateX(5deg);
  }
  .spiral-item:nth-child(8) {
    --rotate-y: 60deg;
    --translate-y: 78%;
    --translate-z: 14rem;
    --opacity-delay: -20s;
    transform: rotateY(60deg) translateZ(14rem) translateY(78%) rotateX(5deg);
  }
  .spiral-item:nth-child(9) {
    --rotate-y: 120deg;
    --translate-y: 102%;
    --translate-z: 14rem;
    --opacity-delay: -40s;
    transform: rotateY(120deg) translateZ(14rem) translateY(102%) rotateX(5deg);
  }
  .spiral-item:nth-child(10) {
    --rotate-y: 180deg;
    --translate-y: 117%;
    --translate-z: 14rem;
    --opacity-delay: -60s;
    transform: rotateY(180deg) translateZ(14rem) translateY(117%) rotateX(5deg);
  }
  .spiral-item:nth-child(11) {
    --rotate-y: 240deg;
    --translate-y: 143%;
    --translate-z: 14rem;
    --opacity-delay: -80s;
    transform: rotateY(240deg) translateZ(14rem) translateY(143%) rotateX(5deg);
  }
  .spiral-item:nth-child(12) {
    --rotate-y: 300deg;
    --translate-y: 158%;
    --translate-z: 14rem;
    --opacity-delay: -100s;
    transform: rotateY(300deg) translateZ(14rem) translateY(158%) rotateX(5deg);
  }

  .adv-container {
    flex-direction: column;
    gap: 5rem;
  }

  .adv-section {
    padding: 4rem 0;
  }

  .orb-wrapper {
    width: 144%;
    transform: scale(0.7);
    margin: 2rem 0;
    height: 5rem;
  }

  .service-container-full {
    padding: 5rem 0 0;
  }

  .service-grid {
    grid-template-columns: 1fr;
  }

  .service-card {
    min-height: 500px;
  }

  .service-card-content {
    padding: 2.5rem 1.5rem;
  }

  .service-card-title {
    font-size: 2rem;
  }

  .service-card-desc {
    font-size: 0.85rem;
  }

  /* スマホ版では常にホバー状態を表示 */
  .service-card-default {
    opacity: 0;
    transform: translateY(-20px);
    pointer-events: none;
  }

  .service-card-details {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
    bottom: 2.5rem;
    left: 1.5rem;
    right: 1.5rem;
  }

  .service-card-overlay {
    background: linear-gradient(
      180deg,
      rgba(0, 212, 255, 0.3) 0%,
      rgba(11, 28, 60, 0.95) 100%
    );
  }

  .works-section {
    padding: 4rem 0;
  }

  /* スマホ版ではスライダー形式に */
  .works-grid {
    display: flex;
    flex-direction: row;
    overflow-x: auto;
    overflow-y: hidden;
    scroll-snap-type: x mandatory;
    scroll-behavior: smooth;
    gap: 1.5rem;
    padding: 0 1rem 2rem;
    margin: 0 -1rem;
    -webkit-overflow-scrolling: touch;
  }

  .works-grid::-webkit-scrollbar {
    height: 8px;
  }

  .works-grid::-webkit-scrollbar-track {
    background: rgba(0, 0, 0, 0.05);
    border-radius: 10px;
  }

  .works-grid::-webkit-scrollbar-thumb {
    background: var(--c-cyan);
    border-radius: 10px;
  }

  .work-item {
    flex: 0 0 85%;
    min-width: 85%;
    scroll-snap-align: center;
  }

  .work-item.hidden,
  .work-item.work-item-hidden {
    display: flex;
    flex-direction: column;
  }

  .works-tabs {
    gap: 0.5rem;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    padding-bottom: 0.5rem;
    margin-bottom: 1rem;
  }

  .works-tabs::-webkit-scrollbar {
    height: 4px;
  }

  .works-tabs::-webkit-scrollbar-track {
    background: rgba(0, 0, 0, 0.05);
  }

  .works-tabs::-webkit-scrollbar-thumb {
    background: var(--c-cyan);
    border-radius: 10px;
  }

  .works-tab {
    font-size: 0.75rem;
    padding: 0.6rem 1rem;
    white-space: nowrap;
  }

  .btn-view-more {
    display: none;
  }

  /* Guide Section Mobile */
  .guide-container {
    grid-template-columns: 1fr;
    gap: 3rem;
  }

  .guide-section {
    padding: 4rem 0;
  }

  .guide-image {
    transform: perspective(1000px) rotateY(0deg);
    order: -1;
  }

  .guide-desc {
    font-size: 0.9rem;
    line-height: 1.8;
  }

  .guide-buttons {
    flex-direction: column;
    gap: 1rem;
  }

  .guide-btn {
    width: 100%;
    justify-content: center;
    padding: 1rem 2rem;
    font-size: 0.95rem;
  }

  .flow-section {
    padding: 4rem 0 4rem 0;
  }

  .flow-list {
    padding-left: 0;
  }

  /* News Section Mobile */
  .news-section {
    padding: 8rem 0 4rem 0;
  }

  .news-section::before {
    height: 5rem;
  }

  .news-list {
    padding: 0 1rem;
  }

  .news-item {
    padding: 1.5rem 0;
  }

  .news-item:hover {
    padding-left: 0.5rem;
    padding-right: 0.5rem;
  }

  .news-meta {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }

  .news-date {
    font-size: 0.85rem;
  }

  .news-category {
    font-size: 0.7rem;
    padding: 0.3rem 0.8rem;
  }

  .news-title {
    font-size: 1rem;
    margin-bottom: 0.6rem;
  }

  .news-excerpt {
    font-size: 0.85rem;
    padding-right: 1.5rem;
  }

  .news-arrow {
    font-size: 1.2rem;
  }

  .btn-view-more-news {
    padding: 1rem 2.5rem;
    font-size: 0.95rem;
  }

  /* Footer Mobile */
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 3rem;
  }

  .footer-brand {
    text-align: center;
  }

  .footer-logo {
    margin: 0 auto 1rem;
  }

  .contact-en {
    font-size: 2.5rem;
  }

  .contact-btn {
    padding: 1rem 3rem;
    font-size: 1rem;
  }

  .footer-cta {
    padding: 5rem 0;
  }

  .footer-col {
    text-align: center;
  }

  .footer-social li a {
    justify-content: center;
  }

  .footer-bottom {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }

  .footer-legal {
    justify-content: center;
  }

  .sec-header {
    margin-bottom: 2rem;
  }
}