@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Noto+Sans+JP:wght@300;400;500;700&display=swap');

:root {
  --bg-color: #ffffff;
  --primary: #19A3A4;      /* 学生向け・シアン */
  --secondary: #FEBC50;    /* サブ・オレンジ */
  --accent: #FEBC50;       /* 企業向け・オレンジ */
  --text-main: #111827;     /* メインテキスト（ほぼ黒） */
  --text-muted: #4B5563;    /* サブテキスト（グレー） */
  
  --card-bg: rgba(255, 255, 255, 0.65);
  --card-border: rgba(0, 0, 0, 0.08);
  --card-hover-bg: rgba(255, 255, 255, 0.9);
  --card-hover-border: rgba(0, 0, 0, 0.15);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html, body {
  width: 100%;
  height: 100%;
}

body {
  background-color: var(--bg-color);
  color: var(--text-main);
  font-family: 'Inter', 'Noto Sans JP', sans-serif;
  overflow-y: auto; /* 画面高さ不足時にスクロール可能に */
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Three.js Canvas Container */
#canvas-container {
  position: fixed; /* スクロールしても背景として固定 */
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 0;
  pointer-events: none;
}

/* Main UI Layer */
#ui-layer {
  position: relative;
  z-index: 10;
  width: 100%;
  min-height: 100vh; /* 最低100vhを確保し、はみ出せば自動で縦伸びする */
  height: auto;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 3rem 2rem;
  transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1), transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.fade-out {
  opacity: 0 !important;
  transform: scale(0.98);
}

/* Typography */
.logo {
  font-size: 2.5rem;
  font-weight: 700;
  letter-spacing: -0.05em;
  margin-bottom: 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.25rem;
  color: var(--text-main);
}

.logo-icon {
  color: var(--primary);
}

.catchcopy {
  font-size: clamp(2rem, 5vw, 4rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  text-align: center;
  line-height: 1.2;
  margin-bottom: 1rem;
  background: linear-gradient(135deg, #111827 0%, #374151 50%, #4b5563 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.subcopy {
  font-size: clamp(1rem, 1.5vw, 1.125rem);
  color: var(--text-muted);
  text-align: center;
  margin-bottom: 3.5rem;
  font-weight: 400;
}

/* Cards Layout */
.cards-container {
  display: flex;
  gap: 2rem;
  width: 100%;
  max-width: 1000px;
  margin: 0 auto;
  perspective: 1000px;
}

/* Glassmorphism Card (Light Theme) */
.nav-card {
  flex: 1;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 24px;
  padding: 2.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  text-decoration: none;
  color: var(--text-main);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  position: relative;
  /* overflow: hidden; Removed to allow 3D pop-out effects */
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.02);
  transition: all 0.5s cubic-bezier(0.16, 1, 0.3, 1);
  cursor: pointer;
  transform-style: preserve-3d;
}

/* Hover Effects */
.nav-card:hover {
  background: var(--card-hover-bg);
  border-color: var(--card-hover-border);
  transform: translateY(-8px);
}

/* Glow Effect on Hover (Subtle Light Glow) */
.nav-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  border-radius: 24px;
  background: radial-gradient(
    800px circle at var(--mouse-x) var(--mouse-y), 
    rgba(0, 0, 0, 0.02),
    transparent 45%
  );
  z-index: -1;
  opacity: 0;
  transition: opacity 0.5s;
}

.nav-card:hover::before {
  opacity: 1;
}

/* Subtle border glow lines */
.nav-card::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: 24px;
  padding: 1px;
  background: linear-gradient(
    135deg, 
    rgba(0,0,0,0.1) 0%, 
    rgba(0,0,0,0) 50%, 
    rgba(0,0,0,0.02) 100%
  );
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  opacity: 0.5;
  transition: opacity 0.5s;
}

.nav-card:hover::after {
  opacity: 1;
}

/* Specific Card Themes (Light Optimized) */
.card-student:hover {
  box-shadow: 0 30px 60px rgba(25, 163, 164, 0.1), 0 0 100px rgba(25, 163, 164, 0.02) inset;
  border-color: rgba(25, 163, 164, 0.25);
}

.card-student:hover .icon-wrapper {
  background: rgba(25, 163, 164, 0.1);
  color: var(--primary);
  transform: translateZ(60px) scale(1.1);
}

.card-student:hover .action-btn {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

.card-company:hover {
  box-shadow: 0 30px 60px rgba(254, 188, 80, 0.1), 0 0 100px rgba(254, 188, 80, 0.02) inset;
  border-color: rgba(254, 188, 80, 0.25);
}

.card-company:hover .icon-wrapper {
  background: rgba(254, 188, 80, 0.1);
  color: var(--accent);
  transform: translateZ(60px) scale(1.1);
}

.card-company:hover .action-btn {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

/* Card Content Elements */
.icon-wrapper {
  width: 64px;
  height: 64px;
  border-radius: 16px;
  background: rgba(0, 0, 0, 0.03);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.5rem;
  color: var(--text-main);
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  transform: translateZ(60px);
}

.card-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  transform: translateZ(40px);
}

.card-desc {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 2rem;
  line-height: 1.5;
}

.feature-list {
  list-style: none;
  width: 100%;
  margin-bottom: 2.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  text-align: left;
}

.feature-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.feature-icon {
  color: rgba(0, 0, 0, 0.25);
  width: 16px;
  height: 16px;
}

.action-btn {
  width: 100%;
  padding: 1rem;
  border-radius: 12px;
  background: transparent;
  border: 1px solid rgba(0, 0, 0, 0.08);
  color: var(--text-main);
  font-weight: 600;
  font-size: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  transition: all 0.3s ease;
}

.action-btn i {
  transition: transform 0.3s ease;
}

.nav-card:hover .action-btn i {
  transform: translateX(4px);
}

/* Visibility Control for GSAP */
.gsap-reveal {
  visibility: hidden;
}

/* Responsive and Scroll Fixes */
@media (max-width: 768px) {
  .cards-container {
    flex-direction: column;
    max-width: 400px;
    gap: 1.5rem;
  }
  
  .nav-card {
    padding: 2rem;
  }
  
  #ui-layer {
    padding: 3rem 1.5rem;
    justify-content: flex-start;
  }
}

/* ---------------------------------------------------- */
/* 3D Glow CTA Buttons */
/* ---------------------------------------------------- */
.btn-3d-glow {
  position: relative;
  transform-style: preserve-3d;
  transition: transform 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275), box-shadow 0.4s ease;
  z-index: 10;
}
.btn-3d-glow:hover {
  transform: perspective(800px) translateZ(30px) translateY(-5px);
  box-shadow: 0 20px 40px rgba(25, 163, 164, 0.4), 0 0 15px rgba(25, 163, 164, 0.4) inset;
}
.btn-3d-glow::after {
  content: '';
  position: absolute;
  inset: -3px;
  border-radius: inherit;
  background: linear-gradient(90deg, #19A3A4, #FEBC50, #19A3A4);
  background-size: 200% 100%;
  z-index: -1;
  opacity: 0;
  transform: translateZ(-20px);
  transition: opacity 0.4s ease, transform 0.4s ease;
  animation: bg-pan 3s linear infinite;
  filter: blur(8px);
}
.btn-3d-glow:hover::after {
  opacity: 0.8;
  transform: translateZ(-10px) scale(1.05);
}
@keyframes bg-pan {
  0% { background-position: 0% 50%; }
  100% { background-position: 200% 50%; }
}

/* ---------------------------------------------------- */
/* Mobile Specific Modern UI (Snap, Swiper, Fade) */
/* ---------------------------------------------------- */
/* 1. Scroll Snap Carousel (Events) */
.snap-carousel-container {
  display: flex;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
  gap: 1rem;
  padding-bottom: 1rem;
  scrollbar-width: none;
}
.snap-carousel-container::-webkit-scrollbar {
  display: none;
}
.snap-carousel-item {
  scroll-snap-align: center;
  flex: 0 0 85%;
}

/* 2. Swiper Coverflow (Gallery) */
.mobile-swiper-container {
  width: 100%;
  padding-top: 1rem;
  padding-bottom: 2rem;
  overflow: hidden;
}
.swiper-slide-gallery {
  background-position: center;
  background-size: cover;
  width: 260px;
  height: 260px;
  border-radius: 16px;
  box-shadow: 0 15px 25px rgba(0,0,0,0.2);
  display: flex;
  justify-content: center;
  align-items: center;
  overflow: hidden;
}
.swiper-slide-gallery img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* 3. Random Fade Shuffle (Logos) */
.logo-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}
.logo-fade-item {
  transition: opacity 0.8s ease-in-out;
  opacity: 1;
}

.face-mosaic {
  position: absolute;
  background: transparent;
  backdrop-filter: blur(15px) contrast(1.1);
  -webkit-backdrop-filter: blur(15px) contrast(1.1);
  border-radius: 40%;
  z-index: 20;
}

@media (min-width: 769px) {
  .mobile-only {
    display: none !important;
  }
}

@media (max-width: 768px) {
  .desktop-only {
    display: none !important;
  }
}

/* ---------------------------------------------------- */
/* Logo Image Styles */
/* ---------------------------------------------------- */
.logo-white {
  filter: brightness(0) invert(1) !important;
}

#entrance-logo {
  display: flex;
  justify-content: center;
  align-items: center;
  margin-bottom: 2rem;
}

#entrance-logo img {
  height: 5.5rem;
  width: auto;
  max-width: 90vw;
  object-fit: contain;
}

@media (max-width: 768px) {
  #entrance-logo img {
    height: 4.5rem;
  }
}