@charset "UTF-8";

/* ==========================================================================
   CSS Variables & Reset
   ========================================================================== */
:root {
  --bg-color: #050505;
  --bg-gradient-1: #0a0a0c;
  --bg-gradient-2: #141416;
  --text-main: #f0f0f0;
  --text-muted: #949a9f;
  --accent: #d4af37; /* Very subtle gold */
  --accent-glow: rgba(212, 175, 55, 0.15);
  --border-light: rgba(255, 255, 255, 0.08);
  --glass-bg: rgba(20, 20, 22, 0.4);
  
  --font-en: 'Inter', -apple-system, sans-serif;
  --font-ja: 'Shippori Mincho', 'Noto Serif JP', serif;
  
  --ease-smooth: cubic-bezier(0.23, 1, 0.32, 1);
}

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

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

body {
  background-color: var(--bg-color);
  color: var(--text-main);
  font-family: var(--font-ja);
  line-height: 1.8;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a:hover {
  opacity: 0.7;
}

/* ==========================================================================
   Typography
   ========================================================================== */
h1, h2, h3, .eyecatch, .title, .subtitle {
  font-weight: 400;
  letter-spacing: 0.05em;
}

.title {
  font-family: var(--font-ja);
  font-size: clamp(2.5rem, 5vw, 4rem);
  letter-spacing: 0.15em;
  margin-bottom: 1rem;
  background: linear-gradient(180deg, #fff 0%, #aaa 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.subtitle {
  font-family: var(--font-ja);
  font-size: clamp(1rem, 2vw, 1.25rem);
  color: var(--text-muted);
  letter-spacing: 0.1em;
}

.eyecatch {
  display: block;
  font-family: var(--font-en);
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.3em;
  color: var(--accent);
  margin-bottom: 2rem;
}

.section-title {
  font-family: var(--font-en);
  font-size: clamp(1.5rem, 3vw, 2.5rem);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  margin-bottom: 0.5rem;
}

.section-subtitle {
  font-family: var(--font-ja);
  font-size: 1rem;
  color: var(--text-muted);
  letter-spacing: 0.1em;
  margin-bottom: 3rem;
}

/* ==========================================================================
   Layouts
   ========================================================================== */
.container {
  width: 90%;
  max-width: 1000px;
  margin: 0 auto;
}

.container.xl {
  max-width: 1200px;
}

.section-padding {
  padding: 100px 0;
}

.pt-0 {
  padding-top: 0;
}

.center {
  text-align: center;
}

.flex-center {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
}

.sp-only {
  display: none;
}

/* ==========================================================================
   Background Effects
   ========================================================================== */
.glow-bg {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: 
    radial-gradient(circle at 15% 50%, rgba(200, 200, 255, 0.02) 0%, transparent 50%),
    radial-gradient(circle at 85% 30%, rgba(212, 175, 55, 0.03) 0%, transparent 50%);
  pointer-events: none;
  z-index: -1;
}

.glow-point {
  position: fixed;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, var(--accent-glow) 0%, transparent 60%);
  border-radius: 50%;
  top: -200px;
  right: -200px;
  pointer-events: none;
  z-index: -1;
  filter: blur(50px);
}

/* ==========================================================================
   Header & Footer
   ========================================================================== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  padding: 2rem;
  z-index: 100;
  display: flex;
  justify-content: flex-start;
}

.logo {
  font-family: var(--font-en);
  font-size: 0.8rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--text-main);
}

.footer {
  border-top: 1px solid var(--border-light);
  padding: 4rem 0;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-logo {
  font-family: var(--font-en);
  font-size: 0.875rem;
  letter-spacing: 0.1em;
}

.copyright {
  font-family: var(--font-en);
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero {
  height: 100vh;
  position: relative;
  text-align: center;
}

.scroll-indicator {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

.scroll-text {
  font-family: var(--font-en);
  font-size: 0.6rem;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--text-muted);
}

.scroll-line {
  width: 1px;
  height: 60px;
  background: linear-gradient(to bottom, var(--text-muted), transparent);
  animation: scrollAnim 2s ease-in-out infinite;
  transform-origin: top;
}

@keyframes scrollAnim {
  0% { transform: scaleY(0); opacity: 0; }
  50% { transform: scaleY(1); opacity: 1; }
  100% { transform: scaleY(0); opacity: 0; transform-origin: bottom; }
}

/* ==========================================================================
   Concept Section
   ========================================================================== */
.concept-grid {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 4rem;
  align-items: flex-start;
}

.text-lead p {
  font-size: 1.125rem;
  color: var(--text-muted);
  margin-bottom: 2rem;
  line-height: 2.2;
}

.text-lead p:last-child {
  margin-bottom: 0;
}

/* ==========================================================================
   Table Section
   ========================================================================== */
.table-wrapper {
  overflow-x: auto;
  padding-bottom: 1rem;
}

.glass-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  text-align: left;
  border-radius: 12px;
  overflow: hidden;
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border-light);
}

.glass-table th, 
.glass-table td {
  padding: 1.5rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

.glass-table tr:last-child td {
  border-bottom: none;
}

.glass-table th {
  background: rgba(255, 255, 255, 0.02);
  font-weight: 500;
  letter-spacing: 0.1em;
  color: var(--text-main);
  white-space: nowrap;
}

.glass-table .td-key {
  font-weight: 500;
  color: var(--text-main);
  white-space: nowrap;
}

.glass-table .td-def {
  color: var(--text-muted);
  font-size: 0.95rem;
}

.glass-table .td-desc {
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.8;
}

.glass-table tbody tr {
  transition: background-color 0.3s ease;
}

.glass-table tbody tr:hover {
  background: rgba(255, 255, 255, 0.03);
}

/* ==========================================================================
   Future Section
   ========================================================================== */
.glass-panel {
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-light);
  border-radius: 12px;
  padding: 4rem;
  text-align: center;
}

.future-heading {
  font-size: 1.5rem;
  margin-bottom: 2rem;
  letter-spacing: 0.1em;
}

.future-text p {
  color: var(--text-muted);
  margin-bottom: 1.5rem;
  line-height: 2;
}

.future-text .note-text {
  font-size: 0.85rem;
  color: #777;
  margin-top: 3rem;
  margin-bottom: 0;
}

/* ==========================================================================
   Navigation Buttons
   ========================================================================== */
.button-group {
  gap: 2rem;
  margin-top: 2rem;
}

.btn-cta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: 800px;
  padding: 2.5rem 3rem;
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border-light);
  border-radius: 12px;
  transition: all 0.5s var(--ease-smooth);
  position: relative;
  overflow: hidden;
}

.btn-cta .btn-text {
  font-family: var(--font-ja);
  font-size: 1.1rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  color: var(--text-main);
  text-align: left;
}

.btn-cta .btn-arrow {
  margin-left: 2rem;
  font-size: 1.5rem;
  color: var(--accent);
  transition: transform 0.5s var(--ease-smooth);
}

.btn-cta:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: rgba(212, 175, 55, 0.3);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
  transform: translateY(-5px);
  opacity: 1;
}

.btn-cta:hover .btn-arrow {
  transform: translateX(10px);
}

.btn-secondary {
  font-family: var(--font-ja);
  font-size: 0.9rem;
  color: var(--text-muted);
  letter-spacing: 0.1em;
  position: relative;
  padding-bottom: 5px;
  opacity: 0.8;
  transition: all 0.3s ease;
}

.btn-secondary::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--text-muted);
  transition: width 0.3s ease;
}

.btn-secondary:hover {
  color: var(--text-main);
  opacity: 1;
}

.btn-secondary:hover::after {
  width: 100%;
}

/* ==========================================================================
   Animations
   ========================================================================== */
.fade-in {
  opacity: 0;
  animation: fadeIn 1.5s var(--ease-smooth) forwards;
}

.fade-in-up {
  opacity: 0;
  transform: translateY(30px);
  animation: fadeInUp 1.5s var(--ease-smooth) forwards;
}

.delay-1 {
  animation-delay: 0.5s;
}

@keyframes fadeIn {
  to { opacity: 1; }
}

@keyframes fadeInUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.section-fade {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 1s var(--ease-smooth), transform 1s var(--ease-smooth);
}

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

/* ==========================================================================
   Media Queries
   ========================================================================== */
@media (max-width: 768px) {
  .concept-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  
  .footer-inner {
    flex-direction: column;
    gap: 1.5rem;
    text-align: center;
  }
  
  .glass-panel {
    padding: 2.5rem 1.5rem;
  }
  
  .sp-only {
    display: inline;
  }
  
  .glass-table th, 
  .glass-table td {
    padding: 1rem;
  }
}