/* ---- Apple-inspired Light Theme Design Tokens ---- */
:root {
  /* Light theme colors */
  --bg: #ffffff;
  --bg-secondary: #f8f9fa;
  --fg: #1d1d1f;
  --fg-secondary: #6e6e73;
  --fg-tertiary: #86868b;
  
  /* Glass morphism for light theme */
  --glass: rgba(255, 255, 255, 0.85);
  --glass-strong: rgba(255, 255, 255, 0.95);
  --glass-subtle: rgba(255, 255, 255, 0.7);
  --glass-border: rgba(0, 0, 0, 0.08);
  --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.08);
  --glass-shadow-hover: 0 16px 48px rgba(0, 0, 0, 0.12);
  
  /* Apple blue accent */
  --primary: #007AFF;
  --primary-hover: #0056CC;
  --primary-light: rgba(0, 122, 255, 0.1);
  
  /* Borders and strokes */
  --border: rgba(0, 0, 0, 0.08);
  --border-strong: rgba(0, 0, 0, 0.15);
  
  /* Layout */
  --container: 1200px;
  --radius: 20px;
  --radius-small: 12px;
  --blur: 20px;
  
  /* Animations */
  --ease: cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --ease-spring: cubic-bezier(0.175, 0.885, 0.32, 1.275);
  --duration: 0.4s;
  --duration-fast: 0.2s;
}


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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Noto Sans JP', -apple-system, BlinkMacSystemFont, 'Hiragino Kaku Gothic ProN', 'Hiragino Sans', Meiryo, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--fg);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
  font-feature-settings: "palt" 1;
}

/* ---- Beautiful Background ---- */
.bg-aurora {
  position: fixed;
  inset: 0;
  z-index: -1;
  background: 
    radial-gradient(80vw 50vh at 20% 40%, rgba(0, 122, 255, 0.08) 0%, transparent 60%),
    radial-gradient(60vw 40vh at 80% 20%, rgba(0, 122, 255, 0.06) 0%, transparent 65%),
    radial-gradient(90vw 60vh at 50% 80%, rgba(0, 122, 255, 0.04) 0%, transparent 70%);
  animation: aurora 20s ease-in-out infinite;
}

@keyframes aurora {
  0%, 100% { 
    opacity: 1;
    transform: translateY(0px);
  }
  50% { 
    opacity: 0.8;
    transform: translateY(-10px);
  }
}

/* ---- Layout Utils ---- */
.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

/* ---- Navigation ---- */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: saturate(180%) blur(var(--blur));
  background: var(--glass-strong);
  border-bottom: 1px solid var(--border);
  transition: all var(--duration) var(--ease);
}

.nav::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, var(--bg) 0%, transparent 100%);
  pointer-events: none;
}

.nav > .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 16px;
  padding-bottom: 16px;
  position: relative;
  z-index: 1;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--fg);
  font-weight: 600;
  font-size: 20px;
  transition: opacity var(--duration-fast) var(--ease);
}

.brand:hover {
  opacity: 0.7;
}

.logo {
  width: 32px;
  height: 32px;
  display: block;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-links a {
  color: var(--fg);
  text-decoration: none;
  font-weight: 400;
  font-size: 17px;
  transition: all var(--duration-fast) var(--ease);
  position: relative;
}

.nav-links a:hover {
  color: var(--primary);
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -6px;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--primary);
  border-radius: 1px;
  transition: all var(--duration) var(--ease);
  transform: translateX(-50%);
}

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

.nav .ghost {
  padding: 10px 20px;
  border-radius: 50px;
  border: 1.5px solid var(--border-strong);
  font-weight: 500;
  transition: all var(--duration) var(--ease);
}

.nav .ghost:hover {
  background: var(--glass-subtle);
  border-color: var(--primary);
  color: var(--primary);
  transform: translateY(-1px);
}

.nav .ghost::after {
  display: none;
}

.nav .primary {
  padding: 12px 24px;
  border-radius: 50px;
  background: var(--primary);
  color: white;
  font-weight: 600;
  transition: all var(--duration) var(--ease);
  box-shadow: 0 4px 16px rgba(0, 122, 255, 0.3);
}

.nav .primary:hover {
  background: var(--primary-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 122, 255, 0.4);
  color: white;
}

.nav .primary::after {
  display: none;
}

/* ---- Mobile Menu ---- */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  border-radius: var(--radius-small);
  transition: all var(--duration-fast) var(--ease);
}

.hamburger:hover {
  background: var(--glass-subtle);
}

.hamburger span {
  width: 24px;
  height: 2px;
  background: var(--fg);
  border-radius: 1px;
  transition: all var(--duration) var(--ease);
}

.mobile-sheet {
  position: fixed;
  top: 80px;
  left: 24px;
  right: 24px;
  padding: 24px;
  background: var(--glass-strong);
  backdrop-filter: blur(var(--blur));
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--glass-shadow-hover);
  display: grid;
  gap: 16px;
  z-index: 90;
  opacity: 0;
  transform: translateY(-20px);
  transition: all var(--duration) var(--ease);
}

.mobile-sheet.open {
  opacity: 1;
  transform: translateY(0);
}

.mobile-sheet a {
  text-decoration: none;
  color: var(--fg);
  padding: 16px 20px;
  border-radius: var(--radius-small);
  border: 1px solid var(--border);
  text-align: center;
  font-weight: 500;
  transition: all var(--duration-fast) var(--ease);
}

.mobile-sheet a:hover {
  background: var(--glass-subtle);
  border-color: var(--primary);
}

.mobile-sheet .primary {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
}

.mobile-sheet .primary:hover {
  background: var(--primary-hover);
  transform: translateY(-1px);
}

/* ---- Hero Section ---- */
.hero {
  padding: 120px 0 80px;
  text-align: center;
  position: relative;
}

.hero h1 {
  font-size: clamp(32px, 6vw, 56px);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.015em;
  margin: 0 0 24px;
  background: linear-gradient(135deg, var(--fg) 0%, var(--fg-secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: fadeInUp 1s var(--ease) 0.2s both;
}

.hero .sub {
  max-width: 600px;
  margin: 0 auto 40px;
  font-size: 18px;
  line-height: 1.6;
  color: var(--fg-secondary);
  font-weight: 400;
  animation: fadeInUp 1s var(--ease) 0.4s both;
}

.cta {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 20px;
  margin: 0 0 80px;
  animation: fadeInUp 1s var(--ease) 0.6s both;
}

.btn {
  display: inline-flex;
  align-items: center;
  padding: 16px 32px;
  border-radius: 50px;
  text-decoration: none;
  font-weight: 600;
  font-size: 17px;
  transition: all var(--duration) var(--ease);
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.1) 0%, transparent 50%);
  opacity: 0;
  transition: opacity var(--duration) var(--ease);
}

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

.btn.primary {
  background: var(--primary);
  color: white;
  border: 1px solid var(--primary);
  box-shadow: 0 8px 32px rgba(0, 122, 255, 0.25);
}

.btn.primary:hover {
  background: var(--primary-hover);
  transform: translateY(-3px);
  box-shadow: 0 16px 48px rgba(0, 122, 255, 0.35);
}

.btn.glass {
  background: var(--glass);
  color: var(--fg);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(var(--blur));
  box-shadow: var(--glass-shadow);
}

.btn.glass:hover {
  background: var(--glass-strong);
  transform: translateY(-3px);
  box-shadow: var(--glass-shadow-hover);
}

/* ---- Glass Cards Grid ---- */
.glass-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

.glass-card {
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  padding: 28px 24px;
  text-align: left;
  backdrop-filter: blur(var(--blur));
  box-shadow: var(--glass-shadow);
  transition: all var(--duration) var(--ease);
  position: relative;
  overflow: hidden;
  min-height: 180px;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
}

.glass-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent 0%, rgba(255, 255, 255, 0.4) 50%, transparent 100%);
}

.glass-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--glass-shadow-hover);
  border-color: rgba(0, 122, 255, 0.2);
}

.glass-card h3 {
  margin: 0 0 12px;
  font-size: 20px;
  font-weight: 600;
  color: var(--fg);
  line-height: 1.3;
}

.glass-card p {
  margin: 0;
  color: var(--fg-secondary);
  font-size: 15px;
  line-height: 1.5;
  flex-grow: 1;
}

/* ---- Split Sections ---- */
.split {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 80px;
  align-items: center;
  max-width: var(--container);
  margin: 120px auto;
  padding: 0 24px;
}

.split.reverse {
  grid-template-columns: 0.9fr 1.1fr;
}

.pane {
  min-height: 400px;
}

.glass-pane {
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  padding: 48px 40px;
  backdrop-filter: blur(var(--blur));
  box-shadow: var(--glass-shadow);
  position: relative;
  overflow: hidden;
}

.glass-pane::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent 0%, rgba(255, 255, 255, 0.4) 50%, transparent 100%);
}

.glass-pane h2 {
  margin: 0 0 20px;
  font-size: 28px;
  font-weight: 700;
  color: var(--fg);
  line-height: 1.2;
}

.bullets {
  list-style: none;
  margin: 20px 0 24px 0;
  padding: 0;
}

.bullets li {
  color: var(--fg-secondary);
  font-size: 16px;
  line-height: 1.5;
  margin-bottom: 10px;
  padding-left: 20px;
  position: relative;
}

.bullets li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--primary);
  font-weight: 600;
}

.link {
  color: var(--primary);
  text-decoration: none;
  font-weight: 600;
  font-size: 16px;
  display: inline-flex;
  align-items: center;
  transition: all var(--duration-fast) var(--ease);
}

.link:hover {
  color: var(--primary-hover);
  transform: translateX(4px);
}

/* ---- Mock UI ---- */
.mock {
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  backdrop-filter: blur(var(--blur));
  box-shadow: var(--glass-shadow);
  overflow: hidden;
  position: relative;
}

.mock-top {
  height: 60px;
  background: linear-gradient(180deg, var(--glass-strong) 0%, var(--glass) 100%);
  border-bottom: 1px solid var(--border);
  position: relative;
}

.mock-top::before {
  content: '';
  position: absolute;
  top: 20px;
  left: 20px;
  width: 12px;
  height: 12px;
  background: #ff5f57;
  border-radius: 50%;
  box-shadow: 20px 0 0 #ffbd2e, 40px 0 0 #28ca42;
}

.mock-cols {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  padding: 24px;
}

.mock-card {
  height: 120px;
  background: linear-gradient(135deg, var(--glass-strong) 0%, var(--glass) 100%);
  border: 1px solid var(--border);
  border-radius: var(--radius-small);
  position: relative;
  overflow: hidden;
}

.mock-card::before {
  content: '';
  position: absolute;
  top: 16px;
  left: 16px;
  right: 16px;
  height: 8px;
  background: var(--primary-light);
  border-radius: 4px;
}

.mock-card::after {
  content: '';
  position: absolute;
  top: 32px;
  left: 16px;
  width: 60%;
  height: 6px;
  background: var(--border-strong);
  border-radius: 3px;
}

.mock-card.wide {
  grid-column: span 2;
  height: 160px;
}

/* ---- Footer ---- */
.footer {
  border-top: 1px solid var(--border);
  margin: 120px 0 0;
  padding: 40px 0;
  background: var(--bg-secondary);
}

.footer-row {
  max-width: var(--container);
  padding: 0 24px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--fg-secondary);
}

.footer-row nav {
  display: flex;
  gap: 32px;
}

.footer-row a {
  text-decoration: none;
  color: var(--fg-secondary);
  transition: color var(--duration-fast) var(--ease);
}

.footer-row a:hover {
  color: var(--primary);
}

/* ---- Animations ---- */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.animate-in {
  animation: fadeInUp 0.8s var(--ease) forwards;
}

/* ---- Responsive Design ---- */
@media (max-width: 1200px) {
  .glass-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .split, .split.reverse {
    gap: 60px;
  }
}

@media (max-width: 868px) {
  .nav-links {
    display: none;
  }
  
  .hamburger {
    display: flex;
  }
  
  .hero {
    padding: 80px 0 60px;
  }
  
  .hero h1 {
    font-size: clamp(40px, 10vw, 60px);
  }
  
  .hero .sub {
    font-size: 19px;
    margin-bottom: 32px;
  }
  
  .cta {
    flex-direction: column;
    gap: 16px;
    margin-bottom: 60px;
  }
  
  .btn {
    width: 100%;
    max-width: 280px;
    justify-content: center;
  }
  
  .glass-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  
  .split, .split.reverse {
    grid-template-columns: 1fr;
    gap: 40px;
    margin: 80px auto;
  }
  
  .glass-pane {
    padding: 32px 28px;
  }
  
  .glass-pane h2 {
    font-size: 28px;
    margin-bottom: 20px;
  }
  
  .mock-cols {
    grid-template-columns: 1fr;
    gap: 12px;
    padding: 20px;
  }
  
  .mock-card.wide {
    grid-column: span 1;
  }
  
  .footer-row {
    flex-direction: column;
    gap: 20px;
    text-align: center;
  }
  
  .footer-row nav {
    gap: 24px;
  }
  
  .features {
    padding: 80px 0;
  }
  
  .features h2 {
    font-size: 32px;
    margin-bottom: 48px;
  }
  
  .features-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  
  .feature-item {
    padding: 32px 24px;
  }
  
  .feature-item h3 {
    font-size: 20px;
  }
}

@media (max-width: 480px) {
  .container, .glass-grid {
    padding: 0 16px;
  }
  
  .hero {
    padding: 60px 0 40px;
  }
  
  .cta {
    margin-bottom: 40px;
  }
  
  .glass-card {
    padding: 24px 20px;
  }
  
  .split {
    margin: 60px auto;
  }
  
  .glass-pane {
    padding: 24px 20px;
  }
  
  .mobile-sheet {
    left: 16px;
    right: 16px;
    padding: 20px;
  }
  
  .features {
    padding: 60px 0;
  }
  
  .features h2 {
    font-size: 28px;
    margin-bottom: 40px;
  }
  
  .features-grid {
    padding: 0 16px;
    gap: 20px;
  }
  
  .feature-item {
    padding: 28px 20px;
  }
  
  .feature-icon {
    font-size: 40px;
    margin-bottom: 20px;
  }
  
  .feature-item h3 {
    font-size: 18px;
    margin-bottom: 12px;
  }
  
  .feature-item p {
    font-size: 15px;
  }
}

/* ---- Enhanced Focus States ---- */
.btn:focus-visible,
.nav-links a:focus-visible,
.link:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 4px;
}

/* ---- Smooth Scroll ---- */
html {
  scroll-padding-top: 100px;
}

/* ---- Features Section ---- */
.features {
  padding: 120px 0;
  background: var(--bg-secondary);
}

.features h2 {
  text-align: center;
  font-size: 32px;
  font-weight: 700;
  color: var(--fg);
  margin: 0 0 48px;
  line-height: 1.2;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

.feature-item {
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  padding: 32px 28px;
  text-align: center;
  backdrop-filter: blur(var(--blur));
  box-shadow: var(--glass-shadow);
  transition: all var(--duration) var(--ease);
  position: relative;
  overflow: hidden;
  min-height: 220px;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  align-items: center;
}

.feature-item::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent 0%, rgba(255, 255, 255, 0.4) 50%, transparent 100%);
}

.feature-item:hover {
  transform: translateY(-6px);
  box-shadow: var(--glass-shadow-hover);
  border-color: rgba(0, 122, 255, 0.2);
}

.feature-icon {
  font-size: 40px;
  margin: 0 0 20px;
  line-height: 1;
}

.feature-item h3 {
  margin: 0 0 12px;
  font-size: 20px;
  font-weight: 600;
  color: var(--fg);
  line-height: 1.3;
  text-align: center;
}

.feature-item p {
  margin: 0;
  color: var(--fg-secondary);
  font-size: 15px;
  line-height: 1.5;
  text-align: center;
  flex-grow: 1;
}

/* ---- Print Styles ---- */
@media print {
  .bg-aurora,
  .nav,
  .mobile-sheet,
  .footer {
    display: none;
  }
  
  body {
    background: white;
    color: black;
  }
  
  .glass-card,
  .glass-pane,
  .mock,
  .feature-item {
    background: white;
    border: 1px solid #ccc;
    box-shadow: none;
  }
}