:root {
  --color-primary: #3CCC82;
  --color-primary-dark: #21B86E;
  --color-accent-orange: #FE903A;
  --color-bg-base: #FCFDFE;
  --color-bg-surface: #EDF6F6;
  --color-text: #1B1B1B;
  --color-text-secondary: #2D2D2D;
  --color-border: #E2E9E9;
  --color-icon-bg: #E3F3EC;
  --color-bg-card: #FFFFFF;
  --color-footer-bg: #1B1B1B;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; height: 100%; }
body { font-family: 'Noto Sans JP', sans-serif; color: var(--color-text); line-height: 1.8; background: #fff; min-height: 100%; display: flex; flex-direction: column; }

.lang-switcher { position: fixed; top: 20px; right: 20px; z-index: 1000; }
.lang-switcher select { padding: 8px 32px 8px 12px; font-size: 14px; border: 1px solid var(--color-border); border-radius: 8px; background: #fff; cursor: pointer; appearance: none; }

.hero { min-height: 100vh; background: var(--color-bg-base); display: flex; align-items: center; justify-content: center; padding: 120px 24px 180px; position: relative; overflow: hidden; }
.hero-container { max-width: 1200px; margin: 0 auto; display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; position: relative; z-index: 2; box-sizing: border-box; }
@media (max-width: 900px) { .hero-container { grid-template-columns: 1fr; text-align: center; gap: 40px; } }
.hero-content { text-align: left; }
@media (max-width: 900px) { .hero-content { text-align: center; } }
.hero-image { display: flex; justify-content: center; gap: 40px; }
.hero-slideshow { position: relative; width: 280px; aspect-ratio: 400 / 948; border-radius: 24px; overflow: hidden; opacity: 0; }
.hero-slideshow.revealed { opacity: 1; }
.hero-slideshow img { position: absolute; top: 0; left: 0; width: 100%; height: 100%; object-fit: cover; border-radius: 24px; opacity: 0; transition: opacity 800ms ease-in-out; }
.hero-slideshow img.active { opacity: 1; }
.hero-slideshow-left { transform: translateY(30px); transition: opacity 800ms ease-out, transform 800ms ease-out; }
.hero-slideshow-left.revealed { transform: translateY(0); }
.hero-slideshow-right { transform: translateY(calc(80px - 30px)); transition: opacity 800ms ease-out, transform 800ms ease-out; }
.hero-slideshow-right.revealed { transform: translateY(80px); }
@media (max-width: 1100px) {
  .hero-image { gap: 32px; }
  .hero-slideshow { width: 240px; }
  .hero-slideshow-right { transform: translateY(calc(70px - 30px)); }
  .hero-slideshow-right.revealed { transform: translateY(70px); }
}
@media (max-width: 900px) { 
  .hero-image { gap: 24px; }
  .hero-slideshow { width: 200px; }
  .hero-slideshow-right { transform: translateY(calc(60px - 30px)); }
  .hero-slideshow-right.revealed { transform: translateY(60px); }
}
@media (max-width: 750px) {
  .hero-image { gap: 20px; }
  .hero-slideshow { width: 160px; }
  .hero-slideshow-right { transform: translateY(calc(50px - 30px)); }
  .hero-slideshow-right.revealed { transform: translateY(50px); }
}
@media (max-width: 600px) {
  .hero-image { gap: 16px; }
  .hero-slideshow { width: 140px; }
  .hero-slideshow-right { transform: translateY(calc(40px - 30px)); }
  .hero-slideshow-right.revealed { transform: translateY(40px); }
}
.hero-badge { margin-bottom: 24px; }
.hero h1 { font-size: clamp(32px, 5vw, 48px); font-weight: 500; line-height: 1.4; margin-bottom: 20px; }
.hero h1 .highlight { color: var(--color-primary); }
.hero-subtitle { font-size: 16px; color: var(--color-text-secondary); margin-bottom: 16px; }
.hero-description { font-size: 15px; color: var(--color-text-secondary); margin-bottom: 32px; }
.store-buttons { display: flex; gap: 16px; }
@media (max-width: 900px) { .store-buttons { justify-content: center; } }
.store-btn { padding: 10px 28px; border-radius: 50px; font-size: 14px; text-decoration: none; transition: transform 0.2s; }
.store-btn:hover { transform: translateY(-2px); }
.store-btn.appstore { background: #2d2d2d; color: #fff; }
.store-btn.playstore { background: var(--color-primary); color: #fff; }
.hero-wave { position: absolute; bottom: 0; left: 0; width: 100%; height: 200px; overflow: hidden; z-index: 1; }
.hero-wave svg { position: absolute; bottom: 0; left: 0; width: 200%; height: 100%; }

.routine-section { padding: 70px 20px 100px; background: linear-gradient(to bottom, #9DD4BC, #D4EBE0); }
.section-container { max-width: 1200px; margin: 0 auto; }
.routine-section h2 { font-size: clamp(28px, 4vw, 40px); font-weight: 500; text-align: center; margin-bottom: 16px; }
.routine-lead { text-align: center; font-size: 15px; font-weight: 500; margin-bottom: 24px; }
.routine-description { text-align: center; font-size: 15px; max-width: 700px; margin: 0 auto 60px; color: var(--color-text-secondary); }
.routine-cards { display: grid; grid-template-columns: repeat(6, 1fr); gap: 16px; }
@media (max-width: 900px) { .routine-cards { grid-template-columns: repeat(3, 1fr); } }
@media (max-width: 600px) { .routine-cards { grid-template-columns: repeat(2, 1fr); } }

/* カードのフリップ効果 */
.routine-card {
  background: transparent;
  border-radius: 16px;
  text-align: center;
  perspective: 1000px;
  height: 180px;
}
.routine-card-front,
.routine-card-back {
  position: absolute;
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  border-radius: 16px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 24px 16px;
  box-sizing: border-box;
  transition: transform 0.6s cubic-bezier(0.4, 0.2, 0.2, 1);
}
.routine-card-front {
  background: #fff;
}
.routine-card-back {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: #fff;
  transform: rotateY(180deg);
}
.routine-card-back p {
  font-size: 13px;
  line-height: 1.6;
  color: #fff;
  margin: 0;
}
.routine-card:hover .routine-card-front {
  transform: rotateY(-180deg);
}
.routine-card:hover .routine-card-back {
  transform: rotateY(0deg);
}
.routine-card-inner {
  position: relative;
  width: 100%;
  height: 100%;
  transform-style: preserve-3d;
}
.routine-card {
  position: relative;
  transform-style: preserve-3d;
}
.routine-card-icon { font-size: 28px; margin-bottom: 12px; }
.routine-card h3 { font-size: 15px; margin-bottom: 4px; }
.routine-card-front p { font-size: 13px; color: var(--color-text-secondary); margin: 0; }

/* モバイルではタップで反転（ホバー無効環境対応） */
@media (hover: none) {
  .routine-card:active .routine-card-front {
    transform: rotateY(-180deg);
  }
  .routine-card:active .routine-card-back {
    transform: rotateY(0deg);
  }
}

.icd-section { padding: 70px 20px 40px; background: linear-gradient(to bottom, #D4EBE0, #F5F9F5); }
.icd-container { max-width: 1200px; margin: 0 auto; display: grid; grid-template-columns: 55fr 45fr; gap: 40px; align-items: center; }
@media (max-width: 900px) { .icd-container { grid-template-columns: 1fr; } }
.icd-content h2 { font-size: clamp(28px, 4vw, 40px); font-weight: 500; margin-bottom: 24px; }
.icd-content h2 .highlight { color: var(--color-accent-orange); }
.icd-content p { font-size: 15px; color: var(--color-text-secondary); margin-bottom: 24px; }
.icd-disclaimer { font-size: 13px; }
.icd-features { display: flex; flex-direction: column; gap: 12px; }
.icd-feature { background: #fff; border-radius: 12px; padding: 14px 16px; display: flex; align-items: center; gap: 12px; }
.icd-feature-icon { font-size: 20px; width: 40px; height: 40px; background: #FFF4EB; border-radius: 10px; display: flex; align-items: center; justify-content: center; }
.icd-feature h3 { font-size: 14px; font-weight: 500; }
.icd-feature p { font-size: 12px; color: var(--color-text-secondary); margin: 0; }

/* ========================================
   Audio Section - 聞く記事
   ======================================== */
.audio-section { padding: 100px 20px; background: linear-gradient(to bottom, #F5F9F5, #EDF6F6); }
.audio-container { max-width: 1200px; margin: 0 auto; display: grid; grid-template-columns: 45fr 55fr; gap: 60px; align-items: center; }
@media (max-width: 900px) { .audio-container { grid-template-columns: 1fr; gap: 40px; } }
.audio-label { font-size: 13px; color: var(--color-primary); letter-spacing: 2px; margin-bottom: 16px; }
.audio-content h2 { font-size: clamp(28px, 4vw, 40px); font-weight: 500; margin-bottom: 24px; }
.audio-content h2 .highlight { color: var(--color-primary); }
.audio-content > p { font-size: 15px; color: var(--color-text-secondary); margin-bottom: 32px; line-height: 1.8; }
.audio-features { display: flex; flex-wrap: wrap; gap: 16px; }
.audio-feature { display: flex; align-items: center; gap: 8px; background: #fff; padding: 10px 16px; border-radius: 50px; font-size: 14px; color: var(--color-text); box-shadow: 0 2px 8px rgba(0,0,0,0.06); }
.audio-feature img { width: 20px; height: 20px; }

.audio-visual { display: flex; justify-content: center; }
.audio-player-mockup { background: #fff; border-radius: 20px; padding: 24px; width: 100%; max-width: 360px; box-shadow: 0 8px 32px rgba(0,0,0,0.1); }
.audio-player-info { display: flex; justify-content: space-between; margin-bottom: 20px; }
.audio-player-title { font-size: 15px; font-weight: 500; }
.audio-player-duration { font-size: 14px; color: var(--color-text-secondary); }
.audio-waveform { display: flex; align-items: center; justify-content: center; gap: 4px; height: 60px; margin-bottom: 20px; }
.audio-wave-bar { width: 6px; background: var(--color-primary); border-radius: 3px; animation: audioWave 1.2s ease-in-out infinite; }
.audio-wave-bar:nth-child(1) { height: 20px; animation-delay: 0s; }
.audio-wave-bar:nth-child(2) { height: 35px; animation-delay: 0.1s; }
.audio-wave-bar:nth-child(3) { height: 25px; animation-delay: 0.2s; }
.audio-wave-bar:nth-child(4) { height: 45px; animation-delay: 0.3s; }
.audio-wave-bar:nth-child(5) { height: 30px; animation-delay: 0.4s; }
.audio-wave-bar:nth-child(6) { height: 50px; animation-delay: 0.5s; }
.audio-wave-bar:nth-child(7) { height: 35px; animation-delay: 0.6s; }
.audio-wave-bar:nth-child(8) { height: 55px; animation-delay: 0.7s; }
.audio-wave-bar:nth-child(9) { height: 40px; animation-delay: 0.8s; }
.audio-wave-bar:nth-child(10) { height: 30px; animation-delay: 0.9s; }
.audio-wave-bar:nth-child(11) { height: 45px; animation-delay: 1.0s; }
.audio-wave-bar:nth-child(12) { height: 25px; animation-delay: 1.1s; }
@keyframes audioWave {
  0%, 100% { transform: scaleY(0.5); opacity: 0.5; }
  50% { transform: scaleY(1); opacity: 1; }
}
.audio-player-controls { display: flex; justify-content: center; }
.audio-btn-play { width: 56px; height: 56px; border-radius: 50%; background: var(--color-primary); border: none; color: #fff; cursor: pointer; display: flex; align-items: center; justify-content: center; transition: transform 0.2s, box-shadow 0.2s; }
.audio-btn-play:hover { transform: scale(1.05); box-shadow: 0 4px 16px rgba(60, 204, 130, 0.4); }
.audio-btn-play svg { width: 24px; height: 24px; margin-left: 2px; }

@media (prefers-reduced-motion: reduce) {
  .audio-wave-bar { animation: none; opacity: 0.7; }
}

.video-section { padding: 120px 20px 140px; background: var(--color-primary-dark); color: #fff; position: relative; overflow: hidden; }
.video-wave { position: absolute; left: 0; width: 100%; height: 80px; overflow: hidden; z-index: 1; }
.video-wave-top { top: 0; transform: rotate(180deg); }
.video-wave-bottom { bottom: 0; }
.video-wave svg { position: absolute; bottom: 0; left: 0; width: 200%; height: 100%; }
.video-container { max-width: 1200px; margin: 0 auto; display: grid; grid-template-columns: 55fr 45fr; gap: 80px; align-items: center; position: relative; z-index: 2; }
@media (max-width: 900px) { .video-container { grid-template-columns: 1fr; gap: 40px; } }
.video-mockup { display: flex; justify-content: flex-start; }
.video-mockup img { border-radius: 24px; }
.video-content h2 { font-size: clamp(28px, 4vw, 40px); font-weight: 500; margin-bottom: 24px; }
.video-content p { font-size: 15px; color: rgba(255,255,255,0.8); }

.research-section { padding: 40px 20px 100px; background: transparent; }
.research-section h2 { font-size: clamp(28px, 4vw, 40px); text-align: center; margin-bottom: 60px; }
.research-section h2 .highlight { color: var(--color-primary); }
.research-cards { max-width: 1000px; margin: 0 auto; display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
@media (max-width: 800px) { .research-cards { grid-template-columns: 1fr; } }
.research-card { background: #fff; border-radius: 16px; padding: 32px 24px; }
.research-card-icon { font-size: 24px; margin-bottom: 24px; }
.research-card p { font-size: 14px; color: var(--color-text-secondary); }

.features-section { padding: 70px 20px 40px; background: transparent; }
.features-label { text-align: center; font-size: 13px; color: var(--color-accent-orange); letter-spacing: 2px; margin-bottom: 16px; }
.features-section h2 { font-size: clamp(28px, 4vw, 40px); text-align: center; margin-bottom: 60px; }
.features-grid { max-width: 1000px; margin: 0 auto; display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
@media (max-width: 800px) { .features-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 500px) { .features-grid { grid-template-columns: 1fr; } }
.feature-card { background: #fff; border-radius: 16px; padding: 28px 24px; display: flex; gap: 16px; }
.feature-card-icon { font-size: 24px; width: 48px; height: 48px; background: var(--color-icon-bg); border-radius: 50%; display: flex; align-items: center; justify-content: center; }
.feature-card h3 { font-size: 15px; margin-bottom: 6px; }
.feature-card p { font-size: 13px; color: var(--color-text-secondary); }

.family-section { padding: 90px 20px 110px; background: var(--color-bg-base); position: relative; overflow: hidden; }
.family-wave { position: absolute; left: 0; width: 100%; height: 50px; overflow: hidden; z-index: 1; }
.family-wave-top { top: 0; transform: rotate(180deg); }
.family-wave-bottom { bottom: 0; }
.family-wave svg { position: absolute; bottom: 0; left: 0; width: 200%; height: 100%; }
.family-container { max-width: 1000px; margin: 0 auto; display: grid; grid-template-columns: 45fr 55fr; gap: 80px; align-items: center; position: relative; z-index: 2; }
@media (max-width: 800px) { .family-container { grid-template-columns: 1fr; gap: 40px; } }
.family-icons { display: flex; justify-content: center; }
.family-icons-wrapper { display: flex; gap: 16px; background: #fff; padding: 24px 32px; border-radius: 60px; box-shadow: 0 4px 16px rgba(0,0,0,0.06); }
.family-icon { font-size: 32px; width: 56px; height: 56px; display: flex; align-items: center; justify-content: center; }
.family-content .label { font-size: 13px; color: var(--color-accent-orange); letter-spacing: 2px; margin-bottom: 16px; }
.family-content h2 { font-size: clamp(28px, 4vw, 40px); margin-bottom: 24px; }
.family-content h2 .highlight { color: var(--color-primary); }
.family-content p { font-size: 15px; color: var(--color-text-secondary); }

.about-section { padding: 40px 20px 100px; background: var(--color-bg-surface); text-align: center; }
.about-label { font-size: 13px; color: var(--color-primary); letter-spacing: 2px; margin-bottom: 24px; }
.about-section h2 { font-size: clamp(24px, 3vw, 32px); margin-bottom: 24px; }
.about-description { font-size: 15px; color: var(--color-text-secondary); max-width: 700px; margin: 0 auto; }

/* ========================================
   Circadian Rhythm Background Animation
   ======================================== */
.circadian-wrapper { position: relative; overflow: hidden; background: linear-gradient(180deg, #EDF6F6 0%, #EFF7F7 50%, #EDF6F6 100%); }
.circadian-bg { position: absolute; top: 0; left: 0; width: 100%; height: 100%; pointer-events: none; z-index: 0; }

/* 円軌道のスタイル */
.circadian-circle {
  position: absolute;
  border-radius: 50%;
  top: 50%;
  left: 50%;
}

.circadian-circle-1 {
  width: 500px;
  height: 500px;
  border: 2px solid rgba(60, 204, 130, 0.35);
  transform: translate(-50%, -50%);
  animation: circadianPulse1 4s ease-in-out infinite;
}

.circadian-circle-2 {
  width: 750px;
  height: 750px;
  border: 2px solid rgba(60, 204, 130, 0.25);
  transform: translate(-50%, -50%);
  animation: circadianPulse2 5s ease-in-out infinite;
}

.circadian-circle-3 {
  width: 1000px;
  height: 1000px;
  border: 2px solid rgba(60, 204, 130, 0.18);
  transform: translate(-50%, -50%);
  animation: circadianPulse3 6s ease-in-out infinite;
}

/* 太陽（回転する光の点）- より大きく、ボケ強く */
.circadian-sun {
  position: absolute;
  width: 80px;
  height: 80px;
  background: radial-gradient(circle, rgba(254, 144, 58, 0.9) 0%, rgba(254, 144, 58, 0.4) 30%, rgba(254, 144, 58, 0.1) 60%, transparent 80%);
  border-radius: 50%;
  top: 50%;
  left: 50%;
  margin-left: -40px;
  margin-top: -40px;
  transform-origin: 40px 40px;
  animation: circadianOrbit 10s linear infinite;
  filter: blur(8px);
}

.circadian-sun::after {
  content: '';
  position: absolute;
  width: 30px;
  height: 30px;
  background: rgba(254, 144, 58, 1);
  border-radius: 50%;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  box-shadow: 
    0 0 30px rgba(254, 144, 58, 0.9),
    0 0 60px rgba(254, 144, 58, 0.6),
    0 0 100px rgba(254, 144, 58, 0.4),
    0 0 150px rgba(254, 144, 58, 0.2);
  filter: blur(2px);
}

/* 各円の個別脈動アニメーション */
@keyframes circadianPulse1 {
  0%, 100% {
    transform: translate(-50%, -50%) scale(1);
    opacity: 0.5;
  }
  50% {
    transform: translate(-50%, -50%) scale(1.08);
    opacity: 0.8;
  }
}

@keyframes circadianPulse2 {
  0%, 100% {
    transform: translate(-50%, -50%) scale(1);
    opacity: 0.4;
  }
  50% {
    transform: translate(-50%, -50%) scale(1.06);
    opacity: 0.7;
  }
}

@keyframes circadianPulse3 {
  0%, 100% {
    transform: translate(-50%, -50%) scale(1);
    opacity: 0.3;
  }
  50% {
    transform: translate(-50%, -50%) scale(1.04);
    opacity: 0.55;
  }
}

@keyframes circadianOrbit {
  0% {
    transform: rotate(0deg) translateX(250px) rotate(0deg);
  }
  100% {
    transform: rotate(360deg) translateX(250px) rotate(-360deg);
  }
}

/* セクションのz-index調整 */
.circadian-wrapper .research-section,
.circadian-wrapper .features-section {
  position: relative;
  z-index: 1;
}

/* Reduced motion対応 */
@media (prefers-reduced-motion: reduce) {
  .circadian-circle,
  .circadian-sun {
    animation: none !important;
  }
  .circadian-circle {
    opacity: 0.4;
  }
}

.footer { background: var(--color-footer-bg); color: rgba(255,255,255,0.7); padding: 32px 20px; margin-top: auto; }
.footer-container { max-width: 1200px; margin: 0 auto; display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 24px; }
.footer-logo { color: #fff; }
.footer-logo span { color: rgba(255,255,255,0.5); }
.footer-links { display: flex; gap: 32px; }
.footer-links a { color: rgba(255,255,255,0.7); text-decoration: none; font-size: 14px; }
.footer-links a:hover { color: #fff; }
.footer-copyright { font-size: 13px; color: rgba(255,255,255,0.5); }
@media (max-width: 700px) { .footer-container { flex-direction: column; text-align: center; } }