:root {
  --ink: #17243a;
  --muted: #5f6b7b;
  --line: #d9dee6;
  --paper: #ffffff;
  --canvas: #f4f6f8;
  --blue: #2368a2;
  --blue-soft: #e8f1f8;
  --coral: #d85f45;
  --coral-soft: #fff0eb;
  --max-width: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 76px;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--canvas);
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.6;
  letter-spacing: 0;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 62px;
  padding: 0 5vw;
  border-bottom: 1px solid rgba(23, 36, 58, 0.12);
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(10px);
}

.brand,
nav a {
  color: var(--ink);
  font-weight: 800;
  text-decoration: none;
}

.brand {
  font-size: 1.08rem;
}

nav {
  display: flex;
  gap: 1.4rem;
}

nav a {
  color: #526075;
  font-size: 0.84rem;
}

nav a:hover,
nav a:focus-visible {
  color: var(--blue);
}

.hero {
  display: flex;
  align-items: center;
  min-height: 46vh;
  padding: 4.5rem 5vw 4rem;
  color: #fff;
  background: #172b44;
  border-bottom: 6px solid var(--coral);
}

.hero-inner {
  width: min(100%, var(--max-width));
  margin: 0 auto;
}

.eyebrow,
.section-index {
  margin: 0 0 0.7rem;
  color: #7eb8df;
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.hero h1 {
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(4rem, 9vw, 7.5rem);
  font-weight: 500;
  line-height: 0.92;
}

.hero-subtitle {
  max-width: 880px;
  margin: 1.35rem 0 0;
  color: #e6edf4;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(1.3rem, 2.8vw, 2.1rem);
  line-height: 1.2;
}

.capability-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-top: 1.7rem;
}

.capability-list span {
  padding: 0.38rem 0.65rem;
  border: 1px solid rgba(255, 255, 255, 0.28);
  border-radius: 4px;
  font-size: 0.78rem;
  font-weight: 700;
}

.abstract-section {
  padding: 3.2rem max(5vw, calc((100vw - var(--max-width)) / 2));
  background: #fff;
  border-bottom: 1px solid var(--line);
}

.abstract-section h2 {
  margin: 0 0 0.8rem;
  font-size: 1rem;
}

.abstract-section p {
  max-width: 1040px;
  margin: 0;
  color: #455266;
  font-size: 0.95rem;
  line-height: 1.75;
}

.abstract-architecture {
  width: 100%;
  max-width: 1040px;
  margin: 2rem 0 0;
}

.abstract-architecture a {
  display: block;
}

.abstract-architecture img {
  display: block;
  width: 100%;
  height: auto;
}

.section {
  padding: 5rem max(5vw, calc((100vw - var(--max-width)) / 2));
  background: var(--paper);
  border-bottom: 1px solid var(--line);
}

.section-tinted {
  background: #eef3f6;
}

.section-heading {
  max-width: 760px;
  margin-bottom: 2.1rem;
}

.section-heading h2 {
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(2.1rem, 4.5vw, 3.45rem);
  font-weight: 500;
  line-height: 1.08;
}

.section-heading > p:last-child {
  max-width: 680px;
  margin: 0.9rem 0 0;
  color: var(--muted);
  font-size: 0.98rem;
}

.sample-subsection {
  margin: 2.6rem 0 1rem;
}

.sample-subsection h3 {
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.65rem;
  font-weight: 500;
}

.sample-subsection p {
  margin: 0.35rem 0 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.voice-language-heading {
  margin: 1.35rem 0 0.55rem;
}

.voice-language-heading h4 {
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.15rem;
  font-weight: 500;
}

.sample-table + .voice-language-heading {
  margin-top: 2rem;
}

.sample-table {
  width: 100%;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fff;
}

.sample-row {
  display: grid;
  grid-template-columns: minmax(88px, 0.65fr) minmax(190px, 1.25fr) minmax(260px, 1.85fr) minmax(190px, 1.25fr);
  align-items: center;
  min-height: 96px;
  border-top: 1px solid var(--line);
}

.sample-row:first-child {
  border-top: 0;
}

.sample-row > div {
  min-width: 0;
  padding: 0.95rem;
}

.sample-header {
  min-height: 44px;
  color: #596579;
  background: #f5f7fa;
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.sample-meta strong,
.sample-meta span {
  display: block;
}

.sample-meta strong {
  font-size: 0.82rem;
}

.sample-meta span {
  margin-top: 0.18rem;
  color: var(--muted);
  font-size: 0.7rem;
}

.sample-text {
  color: #364255;
  font-size: 0.88rem;
  line-height: 1.5;
}

audio {
  display: block;
  width: 100%;
  min-width: 0;
  height: 40px;
}

.unified-example {
  padding: 2rem 0;
  border-top: 1px solid var(--line);
}

.section-heading + .unified-example {
  padding-top: 0;
  border-top: 0;
}

.unified-example h3 {
  margin: 0 0 0.85rem;
  font-size: 1rem;
}

.unified-example h3 span {
  margin-left: 0.45rem;
  color: var(--muted);
  font-weight: 500;
}

.unified-sequence {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) auto minmax(0, 0.8fr) auto minmax(0, 0.9fr);
  align-items: stretch;
  gap: 0.75rem;
}

.segment {
  padding: 1.2rem;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fff;
}

.segment span {
  display: inline-block;
  margin-bottom: 0.75rem;
  padding: 0.2rem 0.42rem;
  border-radius: 3px;
  font-size: 0.66rem;
  font-weight: 800;
  text-transform: uppercase;
}

.segment p {
  margin: 0;
  color: #354257;
  font-size: 0.88rem;
}

.segment.speech {
  border-top: 4px solid var(--blue);
}

.segment.speech span {
  color: var(--blue);
  background: var(--blue-soft);
}

.segment.singing {
  border-top: 4px solid var(--coral);
}

.segment.singing span {
  color: var(--coral);
  background: var(--coral-soft);
}

.sequence-arrow {
  align-self: center;
  color: #8b95a5;
  font-size: 1.45rem;
}

.unified-audio {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 1.1rem;
}

.unified-audio > div {
  padding: 0.95rem;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fff;
}

.unified-audio span {
  display: block;
  margin-bottom: 0.55rem;
  color: var(--muted);
  font-size: 0.7rem;
  font-weight: 800;
  text-transform: uppercase;
}

footer {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 2rem;
  padding: 2rem max(5vw, calc((100vw - var(--max-width)) / 2));
  color: #aebac8;
  background: #13243a;
  font-size: 0.8rem;
}

footer strong {
  color: #fff;
  font-size: 0.95rem;
}

@media (max-width: 980px) {
  .sample-table {
    overflow-x: auto;
  }

  .sample-row {
    min-width: 960px;
  }

  .unified-sequence {
    grid-template-columns: 1fr;
  }

  .sequence-arrow {
    justify-self: center;
    transform: rotate(90deg);
  }
}

@media (max-width: 680px) {
  .site-header {
    padding: 0 1.1rem;
  }

  nav {
    gap: 0.85rem;
  }

  .hero {
    min-height: 470px;
    padding: 3.5rem 1.25rem 3rem;
  }

  .section {
    padding: 3.7rem 1.25rem;
  }

  .abstract-section {
    padding: 2.5rem 1.25rem;
  }

  .unified-audio {
    grid-template-columns: 1fr;
  }

  footer {
    align-items: flex-start;
    flex-direction: column;
    padding: 1.8rem 1.25rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}