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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 5rem;
}

body {
  font-family: 'Google Sans Text', 'Roboto', -apple-system, BlinkMacSystemFont, sans-serif;
  color: #202124;
  background: #fff;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: 'Google Sans', 'Roboto', sans-serif;
}

a {
  color: #1a73e8;
  text-decoration: none;
  transition: color .2s;
}
a:hover { color: #174ea6; }

b, strong { font-weight: 600; }
u { text-underline-offset: 2px; }

/* ========== Layout ========== */
.container {
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 64px 0;
}

.section-tinted {
  background: #f8f9fa;
}

/* ========== Navigation (Google-style) ========== */
#topbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color .3s, box-shadow .3s;
}
#topbar.scrolled {
  border-bottom-color: #dadce0;
  box-shadow: 0 1px 6px rgba(32,33,36,.1);
}

.nav-inner {
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  height: 64px;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: 'Google Sans', sans-serif;
  font-size: 20px;
  font-weight: 500;
  color: #202124;
}
.nav-brand .material-icons-outlined {
  color: #1a73e8;
  font-size: 24px;
}

.nav-links {
  margin-left: auto;
  display: flex;
  gap: 8px;
}
.nav-links a {
  padding: 8px 16px;
  border-radius: 24px;
  color: #5f6368;
  font-size: 14px;
  font-weight: 500;
  transition: background .2s, color .2s;
}
.nav-links a:hover {
  background: #f1f3f4;
  color: #202124;
}

.nav-mobile-btn {
  display: none;
  margin-left: auto;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  border-radius: 50%;
  color: #5f6368;
}
.nav-mobile-btn:hover { background: #f1f3f4; }

.nav-mobile-menu {
  display: none;
  flex-direction: column;
  padding: 0 24px 16px;
}
.nav-mobile-menu a {
  padding: 12px 16px;
  border-radius: 12px;
  color: #5f6368;
  font-size: 14px;
  font-weight: 500;
}
.nav-mobile-menu a:hover { background: #f1f3f4; }
.nav-mobile-menu.open { display: flex; }

@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-mobile-btn { display: block; }
}

/* ========== Hero ========== */
.hero {
  padding: 140px 24px 80px;
  text-align: center;
  background: linear-gradient(180deg, #e8f0fe 0%, #fff 100%);
}

.hero-inner {
  max-width: 760px;
  margin: 0 auto;
}

.hero-chip {
  display: inline-block;
  padding: 6px 16px;
  border-radius: 24px;
  background: #1a73e8;
  color: #fff;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: .3px;
  margin-bottom: 24px;
}

.hero-title {
  font-size: 56px;
  font-weight: 700;
  color: #202124;
  line-height: 1.1;
  margin-bottom: 16px;
  letter-spacing: -1px;
}

.hero-subtitle {
  font-size: 20px;
  color: #5f6368;
  line-height: 1.5;
  font-weight: 400;
  margin-bottom: 40px;
}

.hero-actions {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
}

/* ========== Buttons (Material 3 style) ========== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 24px;
  border-radius: 24px;
  font-size: 14px;
  font-weight: 500;
  transition: all .2s;
  border: none;
  cursor: pointer;
}
.btn .material-icons-outlined { font-size: 18px; }

.btn-filled {
  background: #1a73e8;
  color: #fff;
  box-shadow: 0 1px 3px rgba(26,115,232,.3);
}
.btn-filled:hover {
  background: #1765cc;
  color: #fff;
  box-shadow: 0 2px 8px rgba(26,115,232,.35);
}

.btn-tonal {
  background: #e8f0fe;
  color: #1a73e8;
}
.btn-tonal:hover {
  background: #d2e3fc;
  color: #174ea6;
}

/* ========== Section Header ========== */
.section-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 32px;
  justify-content: center;
}

.section-icon {
  font-size: 28px;
  color: #1a73e8;
}

.section-header h2 {
  font-size: 32px;
  font-weight: 500;
  color: #202124;
}

.subsection-title {
  font-size: 20px;
  font-weight: 500;
  color: #202124;
  margin: 48px 0 8px;
  text-align: center;
}

.subsection-desc {
  font-size: 14px;
  color: #5f6368;
  text-align: center;
  margin-bottom: 20px;
}

/* ========== Cards (Material 3) ========== */
.card {
  border-radius: 16px;
  overflow: hidden;
}

.card-elevated {
  background: #fff;
  box-shadow: 0 1px 3px rgba(0,0,0,.08), 0 4px 12px rgba(0,0,0,.04);
}

.card-outlined {
  background: #fff;
  border: 1px solid #dadce0;
}

/* ========== Abstract ========== */
.abstract-card {
  padding: 32px 40px;
}
.abstract-card p {
  font-size: 16px;
  line-height: 1.8;
  color: #3c4043;
  text-align: justify;
}

/* ========== Figure ========== */
.figure-card {
  padding: 24px;
  margin-bottom: 16px;
  text-align: center;
}

.figure-img {
  max-width: 100%;
  height: auto;
  border-radius: 12px;
}

.figure-caption {
  margin-top: 16px;
  font-size: 14px;
  color: #5f6368;
  line-height: 1.6;
  text-align: left;
}

/* ========== Taxonomy Cards ========== */
.card-grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.card-grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

@media (max-width: 768px) {
  .card-grid-3 { grid-template-columns: 1fr; }
  .card-grid-2 { grid-template-columns: 1fr; }
}

.taxonomy-card {
  padding: 28px;
}
.taxonomy-card h4 {
  font-size: 16px;
  font-weight: 600;
  color: #202124;
  margin-bottom: 8px;
}
.taxonomy-card p {
  font-size: 14px;
  color: #5f6368;
  margin-bottom: 16px;
  line-height: 1.5;
}

.taxonomy-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
}
.taxonomy-icon .material-icons-outlined { font-size: 24px; }

/* ========== Chips ========== */
.chip-group {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.chip {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 16px;
  font-size: 12px;
  font-weight: 500;
}

.chip-green  { background: #e6f4ea; color: #137333; }
.chip-orange { background: #fef7e0; color: #b06000; }
.chip-blue   { background: #e8f0fe; color: #1967d2; }

/* ========== Pipeline ========== */
.pipeline-card { padding: 32px; }

.pipeline-steps {
  display: flex;
  align-items: flex-start;
  gap: 0;
}

.pipeline-step {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 0 16px;
}

.step-number {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: #1a73e8;
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 16px;
  flex-shrink: 0;
}

.step-content h4 {
  font-size: 15px;
  font-weight: 600;
  color: #202124;
  margin-bottom: 8px;
}
.step-content p {
  font-size: 13px;
  color: #5f6368;
  line-height: 1.5;
}

.pipeline-divider {
  width: 2px;
  min-height: 60px;
  display: none;
}

@media (min-width: 769px) {
  .pipeline-divider {
    display: block;
    width: 48px;
    min-height: auto;
    height: 2px;
    background: #dadce0;
    margin-top: 22px;
    flex-shrink: 0;
  }
}

@media (max-width: 768px) {
  .pipeline-steps {
    flex-direction: column;
    gap: 24px;
  }
  .pipeline-step {
    flex-direction: row;
    text-align: left;
    gap: 16px;
    padding: 0;
  }
  .step-number { margin-bottom: 0; }
}

/* ========== Evaluation Dimensions ========== */
.eval-dim-card { overflow: hidden; }

.eval-dim-header {
  padding: 24px 28px;
  display: flex;
  align-items: center;
  gap: 12px;
  color: #fff;
}
.eval-dim-header .material-icons-outlined { font-size: 28px; }
.eval-dim-header h4 {
  font-size: 18px;
  font-weight: 600;
  color: #fff;
}

.eval-dim-body {
  padding: 24px 28px;
}
.eval-dim-body p {
  font-size: 14px;
  color: #5f6368;
  line-height: 1.6;
  margin-bottom: 16px;
}

.metric-list {
  list-style: none;
}
.metric-list li {
  padding: 6px 0;
  font-size: 14px;
  color: #3c4043;
  border-bottom: 1px solid #f1f3f4;
}
.metric-list li:last-child { border-bottom: none; }

.badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 10px;
  background: #e8f0fe;
  color: #1a73e8;
  font-size: 11px;
  font-weight: 500;
  margin-left: 4px;
  vertical-align: middle;
}

/* ========== Stats ========== */
.stats-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-bottom: 32px;
}

@media (max-width: 640px) {
  .stats-row { grid-template-columns: repeat(2, 1fr); }
}

.stat-card {
  background: #fff;
  border: 1px solid #dadce0;
  border-radius: 16px;
  padding: 24px;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 4px;
  transition: box-shadow .2s;
}
.stat-card:hover {
  box-shadow: 0 1px 6px rgba(0,0,0,.08);
}

.stat-value {
  font-family: 'Google Sans', sans-serif;
  font-size: 36px;
  font-weight: 700;
  color: #1a73e8;
  line-height: 1.2;
}

.stat-label {
  font-size: 14px;
  font-weight: 500;
  color: #202124;
}

.stat-detail {
  font-size: 12px;
  color: #80868b;
}

/* ========== Subsets ========== */
.subset-card { padding: 24px 28px; }

.subset-header {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
}
.subset-header h4 {
  font-size: 16px;
  font-weight: 600;
  color: #202124;
}
.subset-card p {
  font-size: 14px;
  color: #5f6368;
  line-height: 1.6;
  margin-bottom: 16px;
}

.subset-stats {
  display: flex;
  gap: 12px;
}

.subset-stat {
  padding: 8px 16px;
  background: #f1f3f4;
  border-radius: 12px;
  font-size: 13px;
  color: #5f6368;
}
.subset-stat span {
  font-weight: 600;
  color: #202124;
  margin-right: 4px;
}

/* ========== Tables ========== */
.table-card {
  margin-bottom: 16px;
}

.table-header {
  padding: 20px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  user-select: none;
  transition: background .15s;
}
.table-header:hover { background: #f8f9fa; }

.table-header h3 {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 16px;
  font-weight: 500;
  color: #202124;
}
.table-header h3 .material-icons-outlined {
  font-size: 20px;
  color: #5f6368;
}

.expand-icon {
  transition: transform .3s;
  color: #80868b;
}
.expand-icon.rotated { transform: rotate(180deg); }

.table-body {
  padding: 0 28px 24px;
  transition: max-height .4s ease, opacity .3s ease, padding .3s ease;
  overflow: hidden;
}
.table-body.collapsed {
  max-height: 0;
  opacity: 0;
  padding-top: 0;
  padding-bottom: 0;
}

.table-scroll { overflow-x: auto; }

.table-desc {
  font-size: 14px;
  color: #5f6368;
  margin-bottom: 16px;
  line-height: 1.5;
}

.table-note {
  font-size: 12px;
  color: #80868b;
  margin-top: 12px;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

thead tr {
  border-bottom: 2px solid #dadce0;
}

th {
  padding: 10px 14px;
  font-weight: 500;
  color: #5f6368;
  text-align: center;
  white-space: nowrap;
  font-size: 13px;
}
th.text-left { text-align: left; }

.th-sub {
  display: block;
  font-size: 11px;
  font-weight: 400;
  color: #80868b;
}

.group-header {
  border-bottom: 1px solid #e8eaed;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: .5px;
  color: #80868b;
}

td {
  padding: 10px 14px;
  text-align: center;
  color: #3c4043;
  white-space: nowrap;
  border-bottom: 1px solid #f1f3f4;
}
td.text-left { text-align: left; }

tbody tr {
  transition: background .15s;
}
tbody tr:hover { background: #f8f9fa; }

.row-gt {
  background: #f8f9fa;
}
.row-gt td { color: #80868b; font-style: italic; }

.row-ours {
  background: #e8f0fe33;
}
.row-ours td { color: #1a73e8; }

.col-ours {
  color: #1a73e8;
  font-weight: 500;
}

.mark-yes {
  color: #1e8e3e;
  font-weight: 600;
}
.mark-no {
  color: #d93025;
}

.dot {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  margin-right: 6px;
  vertical-align: middle;
}
.dot-green  { background: #34a853; }
.dot-orange { background: #fbbc04; }
.dot-blue   { background: #4285f4; }

.table-compact th,
.table-compact td {
  padding: 8px 10px;
  font-size: 13px;
}

/* ========== Findings ========== */
.finding-card {
  padding: 28px;
  text-align: center;
}
.finding-icon {
  width: 56px;
  height: 56px;
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
}
.finding-icon .material-icons-outlined { font-size: 28px; }

.finding-card h4 {
  font-size: 16px;
  font-weight: 600;
  color: #202124;
  margin-bottom: 8px;
}
.finding-card p {
  font-size: 14px;
  color: #5f6368;
  line-height: 1.5;
}

/* ========== Audio Examples ========== */
.example-card {
  padding: 0;
  margin-bottom: 24px;
  overflow: hidden;
}

.example-header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 18px 28px;
  border-bottom: 1px solid #e8eaed;
  background: linear-gradient(135deg, #f8f9fa 0%, #fff 100%);
}

.example-badge {
  font-family: 'Google Sans', sans-serif;
  font-size: 15px;
  font-weight: 600;
  color: #202124;
}

.example-lang {
  font-size: 11px !important;
  padding: 3px 10px !important;
}

/* Meta area: Target Text + Prompt Audio side by side */
.example-meta {
  display: flex;
  align-items: stretch;
  gap: 0;
  border-bottom: 1px solid #e8eaed;
}

.example-target {
  flex: 1;
  padding: 24px 28px;
  display: flex;
  flex-direction: column;
  gap: 20px;
  border-right: 1px solid #e8eaed;
}

.example-target > div + div {
  padding-top: 18px;
  border-top: 1px dashed #dadce0;
}

.example-target .example-target-text {
  margin-top: 6px;
}

.example-ref {
  flex: 0 0 300px;
  padding: 24px 28px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 16px;
  background: #fafbfc;
}

.example-ref-item {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.example-ref-item audio {
  width: 100%;
  max-width: 240px;
  height: 36px;
}

.example-meta-label {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 8px;
  background: #e8eaed;
  font-size: 11px;
  font-weight: 600;
  color: #5f6368;
  text-transform: uppercase;
  letter-spacing: .5px;
  width: fit-content;
}

.example-meta-label-gt {
  background: #e6f4ea;
  color: #137333;
}

.example-target-text {
  font-size: 15px;
  color: #202124;
  line-height: 1.7;
  word-break: break-word;
}

/* Synthesized outputs sub-header */
.example-synth-header {
  padding: 10px 28px;
  font-size: 11px;
  font-weight: 600;
  color: #80868b;
  text-transform: uppercase;
  letter-spacing: .6px;
  background: #f8f9fa;
  border-bottom: 1px solid #e8eaed;
}

/* Audio grid */
.example-audio-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  padding: 0;
}

.audio-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  padding: 20px 16px;
  border-right: 1px solid #f1f3f4;
  border-bottom: 1px solid #f1f3f4;
  transition: background .15s;
}
.audio-item:hover {
  background: #f8f9fa;
}
.audio-item:nth-child(3n) {
  border-right: none;
}
.audio-item:nth-child(n+4) {
  border-bottom: none;
}

.audio-label {
  font-size: 13px;
  font-weight: 500;
  color: #5f6368;
  letter-spacing: .2px;
}

.audio-label-gt {
  color: #1e8e3e;
  font-weight: 600;
}

.audio-label-ours {
  color: #1a73e8;
  font-weight: 600;
}

.audio-item audio {
  width: 100%;
  max-width: 240px;
  height: 36px;
  border-radius: 18px;
}

@media (max-width: 960px) {
  .example-audio-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .audio-item {
    border-right: 1px solid #f1f3f4;
    border-bottom: 1px solid #f1f3f4;
  }
  .audio-item:nth-child(2n) {
    border-right: none;
  }
  .audio-item:nth-child(n+5) {
    border-bottom: none;
  }
}

@media (max-width: 768px) {
  .example-meta {
    flex-direction: column;
  }
  .example-target {
    border-right: none;
    border-bottom: 1px solid #e8eaed;
  }
  .example-ref {
    flex: none;
    width: 100%;
  }
  .example-ref-item audio {
    max-width: 100%;
  }
}

@media (max-width: 540px) {
  .example-audio-grid {
    grid-template-columns: 1fr;
  }
  .audio-item {
    border-right: none !important;
    border-bottom: 1px solid #f1f3f4;
  }
  .audio-item:last-child {
    border-bottom: none;
  }
  .example-header {
    padding: 16px 20px;
  }
  .example-target,
  .example-ref {
    padding: 16px 20px;
  }
  .example-synth-header {
    padding: 10px 20px;
  }
}

/* ========== Citation ========== */
.citation-card {
  background: #202124;
  padding: 28px 32px;
}
.citation-card pre {
  margin: 0;
  overflow-x: auto;
}
.citation-card code {
  font-family: 'Roboto Mono', 'Menlo', monospace;
  font-size: 14px;
  color: #e8eaed;
  line-height: 1.6;
}

/* ========== Footer ========== */
.footer {
  padding: 32px 0;
  border-top: 1px solid #dadce0;
  text-align: center;
}
.footer p {
  font-size: 14px;
  color: #80868b;
}

/* ========== Responsive ========== */
@media (max-width: 768px) {
  .hero { padding: 120px 20px 60px; }
  .hero-title { font-size: 36px; }
  .hero-subtitle { font-size: 16px; }
  .section { padding: 48px 0; }
  .section-header h2 { font-size: 24px; }
  .abstract-card { padding: 24px; }
  .stats-row { gap: 12px; }
  .stat-value { font-size: 28px; }
  .table-header { padding: 16px 20px; }
  .table-body { padding: 0 20px 20px; }
}