html {
  scroll-behavior: smooth;
}

body {
  background: #ffffff;
  color: #111111;
  font-family: Arial, sans-serif;
  margin: 0;
  line-height: 1.6;
}

section {
  padding: 0;
}

.section-inner {
  max-width: 1000px;
  margin: 0 auto;
  padding: 80px 24px;
}

.section-white {
  background: #ffffff;
}

.section-gray {
  background: #f5f5f5;
}

.hero {
  min-height: 75vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
}

.hero-content {
  max-width: 1000px;
  padding: 0 24px;
}

.hero h1 {
  font-size: 64px;
  margin-bottom: 10px;
  color: #111111;
}

.hero p {
  font-size: 20px;
  color: #555555;
  max-width: 1000px;
  margin: 0 auto;
  line-height: 1.5;
}

.hero .hero-subtitle {
  color: #222222;
  font-size: 22px;
  font-weight: 600;
  margin-bottom: 14px;
}

.hero-buttons {
  margin-top: 32px;
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

.hero-buttons a {
  text-decoration: none;
  color: #111111;
  border: 1px solid #cccccc;
  padding: 10px 24px;
  border-radius: 999px;
  font-size: 15px;
  background: #ffffff;
}

.hero-buttons a:hover {
  background: #111111;
  color: #ffffff;
  border-color: #111111;
}

h2 {
  font-size: 36px;
  margin-top: 0;
  margin-bottom: 16px;
  color: #111111;
}

h3 {
  margin-top: 0;
  margin-bottom: 16px;
  font-size: 26px;
  color: #111111;
}

h4 {
  margin-top: 0;
  margin-bottom: 16px;
  font-size: 20px;
  color: #111111;
}

p {
  font-size: 18px;
  color: #444444;
}

.performance-video {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  margin-top: 24px;
  overflow: hidden;
  border-radius: 16px;
  background: #111111;
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.12);
}

.performance-video iframe {
  display: block;
  width: 100%;
  height: 100%;
  border: 0;
}

.listening-notice {
  margin-top: 22px;
  padding: 14px 16px;
  border: 1px solid #d9c894;
  border-left: 4px solid #9a7417;
  border-radius: 12px;
  background: #fffaf0;
  color: #3f3212;
  font-size: 15px;
  line-height: 1.5;
}

.listening-notice strong {
  display: block;
  margin-bottom: 4px;
  color: #111111;
  font-size: 14px;
}

.listening-notice span {
  display: block;
  color: #4c3a10;
}

.group-box {
  margin-top: 40px;
  padding: 32px;
  background: #f8f8f8;
  border: 1px solid #e5e5e5;
  border-radius: 20px;
}

.demo-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-top: 24px;
}

.demo-card {
  border: 1px solid #dddddd;
  border-radius: 16px;
  padding: 24px;
  background: #ffffff;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.04);
}

.audio-slot {
  margin-top: 12px;
  padding: 16px;
  border: 1px solid #e0e0e0;
  border-radius: 12px;
  background: #fafafa;
  color: #666666;
  text-align: center;
  font-size: 14px;
}

.media-slot {
  display: flex;
  flex-direction: column;
  gap: 12px;
  align-items: stretch;
}

.media-slot-label {
  color: #333333;
  font-weight: 600;
  text-align: center;
}

.media-slot audio,
.media-slot video {
  display: block;
  width: 100%;
}

.media-slot video {
  border-radius: 8px;
  background: #111111;
}

@media (max-width: 768px) {
  .hero h1 {
    font-size: 42px;
  }

  .hero p {
    font-size: 16px;
  }

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

  .section-inner {
    padding: 60px 20px;
  }
}

.hybrid-list {
  margin-top: 32px;
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.hybrid-card {
  padding: 28px;
  border: 1px solid #dddddd;
  border-radius: 18px;
  background: #ffffff;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.04);
}

.hybrid-card h3 {
  margin-top: 0;
  margin-bottom: 20px;
}

.alpha-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

@media (max-width: 900px) {
  .alpha-row {
    grid-template-columns: 1fr;
  }
}

.objective-raw-card {
  max-width: 460px;
  margin: 32px auto 32px auto;
  padding: 24px;
  border: 1px solid #dddddd;
  border-radius: 16px;
  background: #ffffff;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.04);
  text-align: center;
}

.objective-raw-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
  margin: 32px 0;
}

.objective-raw-grid .objective-raw-card {
  max-width: none;
  margin: 0;
}

.objective-raw-card h4 {
  margin-top: 0;
  margin-bottom: 16px;
}

.raw-component-box {
  margin-top: 12px;
  padding: 12px 14px;
  border: 1px solid #e5e5e5;
  border-radius: 10px;
  background: #f7f7f7;
  color: #555555;
  font-size: 13px;
  line-height: 1.45;
  text-align: left;
}

.raw-component-title {
  display: block;
  margin-bottom: 8px;
  color: #222222;
  font-weight: 600;
}

.raw-component-subtitle {
  display: block;
  margin: 12px 0 8px;
  color: #333333;
  font-size: 12px;
  font-weight: 600;
}

.raw-source-list {
  margin: 0;
  display: grid;
  gap: 6px;
}

.raw-source-list div {
  display: grid;
  grid-template-columns: 64px 1fr;
  gap: 10px;
  padding: 7px 9px;
  border: 1px solid #eeeeee;
  border-radius: 8px;
  background: #ffffff;
}

.raw-source-list dt {
  color: #222222;
  font-weight: 600;
}

.raw-source-list dd {
  margin: 0;
  color: #555555;
}

.raw-component-chain {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: raw-chain;
  display: grid;
  gap: 6px;
}

.raw-component-chain li {
  counter-increment: raw-chain;
  display: flex;
  align-items: flex-start;
  gap: 8px;
  padding: 7px 9px;
  border: 1px solid #eeeeee;
  border-radius: 8px;
  background: #ffffff;
}

.raw-component-chain li::before {
  content: counter(raw-chain);
  flex: 0 0 auto;
  width: 18px;
  height: 18px;
  border-radius: 999px;
  background: #111111;
  color: #ffffff;
  font-size: 11px;
  font-weight: 600;
  line-height: 18px;
  text-align: center;
}

@media (max-width: 768px) {
  .objective-raw-grid {
    grid-template-columns: 1fr;
  }
}


.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 16px;
}

.card-header h4 {
  margin: 0;
}

.param-button {
  border: 1px solid #cccccc;
  background: #ffffff;
  color: #111111;
  padding: 6px 12px;
  border-radius: 999px;
  font-size: 13px;
  cursor: pointer;
}

.param-button:hover {
  background: #111111;
  color: #ffffff;
  border-color: #111111;
}

.hybrid-list {
  margin-top: 32px;
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.hybrid-card {
  padding: 28px;
  border: 1px solid #dddddd;
  border-radius: 18px;
  background: #ffffff;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.04);
}

.hybrid-card h3 {
  margin-top: 0;
  margin-bottom: 20px;
}

.alpha-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.alpha-item {
  text-align: center;
}

.alpha-item .audio-slot {
  margin-top: 0;
}

.alpha-param-button {
  margin-top: 10px;
}

.param-modal {
  display: none;
  position: fixed;
  z-index: 999;
  inset: 0;
  background: rgba(0, 0, 0, 0.55);
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.param-modal.show {
  display: flex;
}

.param-modal-content {
  position: relative;
  width: min(560px, 100%);
  max-height: 80vh;
  overflow: auto;

  background: #ffffff;
  border-radius: 18px;
  padding: 32px;
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.25);
}

.param-modal-content h3 {
  text-align: center;
  margin-top: 0;
  margin-bottom: 20px;
}

.param-modal-content pre {
  background: #f7f7f7;
  border: 1px solid #e5e5e5;
  border-radius: 14px;
  padding: 18px;
  overflow: auto;

  font-size: 12px;
  line-height: 1.5;
  color: #333333;
  white-space: pre-wrap;
}

.param-modal-close {
  position: absolute;
  top: 14px;
  left: 16px;

  border: none;
  background: transparent;
  font-size: 24px;
  cursor: pointer;
  color: #777777;
}

.param-modal-close:hover {
  color: #111111;
}

.param-code-box {
  position: relative;
}

.copy-param-button {
  position: absolute;
  top: 12px;
  right: 12px;

  border: 1px solid #cccccc;
  background: #ffffff;
  color: #111111;
  padding: 6px 10px;
  border-radius: 8px;
  font-size: 12px;
  cursor: pointer;
  z-index: 2;
}

.copy-param-button:hover {
  background: #111111;
  color: #ffffff;
  border-color: #111111;
}

.param-code-box pre {
  padding-top: 48px;
}

.score-text {
  margin: -6px 0 14px 0;
  font-size: 14px;
  color: #777777;
}

.contact-info {
  margin-top: 1rem;
  line-height: 1.8;
}

.contact-info a {
  color: inherit;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.contact-info a:hover {
  opacity: 0.65;
}

.overview-figure-img {
  display: block;
  width: 100%;
  max-width: 1100px;
  height: auto;
  margin: 24px auto 12px auto;
}

.figure-caption {
  text-align: center;
  font-size: 0.9rem;
  opacity: 0.75;
  margin-bottom: 40px;
}