.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  gap: 10px;
  padding: 12px 18px;
  border-radius: var(--radius-pill);
  border: 1px solid transparent;
  font-weight: 700;
  font-size: var(--fs-small);
  line-height: 1.1;
  white-space: nowrap;
  transition: transform 0.2s var(--ease), background 0.2s var(--ease), border-color 0.2s var(--ease), color 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

.btn-primary {
  color: #fff;
  background: var(--brand-grad);
  box-shadow: 0 18px 48px color-mix(in srgb, var(--mode-accent) 28%, transparent);
}

.btn-primary:hover { transform: translateY(-1px); }

.btn-ghost {
  color: var(--text-1);
  border-color: var(--hairline-strong);
  background: color-mix(in srgb, var(--surface-soft) 70%, transparent);
  backdrop-filter: blur(14px);
}

.btn-ghost:hover {
  border-color: var(--mode-accent);
}

.btn-sm {
  min-height: 36px;
  padding: 8px 13px;
  font-size: var(--fs-micro);
}

.nav {
  position: fixed;
  z-index: 100;
  top: 0;
  left: 0;
  right: 0;
  border-bottom: 1px solid transparent;
  transition: background 0.35s var(--ease), border-color 0.35s var(--ease);
}

.nav.scrolled {
  background: rgba(var(--page-rgb), 0.76);
  border-bottom-color: var(--hairline);
  backdrop-filter: saturate(160%) blur(18px);
}

.nav-inner {
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 22px;
}

.nav-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-width: max-content;
}

.brand-wordmark {
  display: inline-flex;
  align-items: baseline;
  color: var(--text-1);
  font-size: 1.55rem;
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.08em;
}

.brand-wordmark::after {
  content: "";
  width: 8px;
  height: 8px;
  margin-left: 4px;
  border-radius: 999px;
  background: var(--brand-grad);
  box-shadow: 0 0 14px color-mix(in srgb, var(--mode-accent) 52%, transparent);
}

.footer-wordmark {
  font-size: 2rem;
}

.vtag {
  padding: 2px 7px;
  border: 1px solid var(--hairline-strong);
  border-radius: var(--radius-pill);
  color: var(--text-3);
  font-family: var(--font-mono);
  font-size: 0.68rem;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2px;
}

.nav-links a {
  padding: 8px 11px;
  border-radius: var(--radius-sm);
  color: var(--text-2);
  font-size: var(--fs-small);
  transition: color 0.2s, background 0.2s;
}

.nav-links a:hover {
  color: var(--text-1);
  background: var(--surface-soft);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.nav-burger {
  display: none;
  width: 40px;
  height: 40px;
  border: 1px solid var(--hairline);
  border-radius: var(--radius-sm);
  place-items: center;
}

.nav-burger span,
.nav-burger span::before,
.nav-burger span::after {
  display: block;
  width: 17px;
  height: 1.5px;
  background: var(--text-1);
  border-radius: 2px;
  transition: transform 0.2s var(--ease), opacity 0.2s var(--ease);
}

.nav-burger span { position: relative; }
.nav-burger span::before,
.nav-burger span::after {
  content: "";
  position: absolute;
  left: 0;
}
.nav-burger span::before { transform: translateY(-6px); }
.nav-burger span::after { transform: translateY(6px); }
.nav-burger.open span { background: transparent; }
.nav-burger.open span::before { transform: rotate(45deg); }
.nav-burger.open span::after { transform: rotate(-45deg); }

.mobile-menu {
  position: fixed;
  z-index: 90;
  top: 72px;
  left: 0;
  right: 0;
  display: none;
  padding: 14px 18px 22px;
  border-bottom: 1px solid var(--hairline);
  background: rgba(var(--page-rgb), 0.94);
  backdrop-filter: blur(20px);
}

.mobile-menu.open { display: block; }

.mobile-menu a {
  display: block;
  padding: 13px 4px;
  color: var(--text-1);
  border-bottom: 1px solid var(--hairline);
}

.mode-switch {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 5px;
  border: 1px solid var(--hairline-strong);
  border-radius: var(--radius-pill);
  background: rgba(var(--page-rgb), 0.5);
  backdrop-filter: blur(16px);
}

.mode-switch button {
  min-width: 0;
  padding: 9px 14px;
  border-radius: var(--radius-pill);
  color: var(--text-3);
  font-family: var(--font-mono);
  font-size: 0.74rem;
  line-height: 1.1;
  white-space: nowrap;
  transition: background 0.25s var(--ease), color 0.25s var(--ease), box-shadow 0.25s var(--ease);
}

.mode-switch button[aria-pressed="true"] {
  color: #fff;
  background: var(--brand-grad);
  box-shadow: 0 10px 28px color-mix(in srgb, var(--mode-accent) 26%, transparent);
}

body[data-mode="academic"] .mode-switch button[aria-pressed="true"] {
  color: #fff;
  background: #171717;
}

.mode-switch.compact button { padding: 7px 10px; }

.lang-switch button {
  min-width: 44px;
}

.mobile-lang-switch {
  margin-top: 14px;
}

.hero {
  position: relative;
  min-height: 100svh;
  padding-block: 148px 84px;
  display: flex;
  align-items: center;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: -2;
  background-image: var(--hero-overlay), var(--hero-image);
  background-size: cover;
  background-position: var(--hero-position);
  transform: scale(1.02);
  transition: background-image 0.5s var(--ease), background-position 0.5s var(--ease);
}

.hero::after {
  content: "";
  position: absolute;
  inset: auto 0 0;
  height: 28%;
  z-index: -1;
  background: linear-gradient(to bottom, transparent, var(--page));
  pointer-events: none;
}

.hero-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(370px, 0.78fr);
  gap: clamp(34px, 6vw, 78px);
  align-items: center;
}

.hero-copy {
  max-width: 720px;
}

.hero-kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 14px;
  border: 1px solid var(--hairline-strong);
  border-radius: var(--radius-pill);
  color: var(--text-2);
  background: rgba(var(--page-rgb), 0.46);
  backdrop-filter: blur(14px);
  font-size: var(--fs-small);
}

.pulse-dot {
  width: 8px;
  height: 8px;
  border-radius: 999px;
  background: var(--mode-accent);
  box-shadow: 0 0 14px var(--mode-accent);
}

.hero h1 {
  margin-top: 28px;
  font-size: var(--fs-display);
  line-height: 0.92;
  letter-spacing: -0.072em;
  font-weight: 800;
  max-width: 820px;
}

body[data-mode="academic"] .hero h1 {
  font-family: var(--font-serif);
  font-weight: 700;
  letter-spacing: -0.06em;
}

.hero h1 span {
  color: transparent;
  background: var(--brand-grad);
  -webkit-background-clip: text;
  background-clip: text;
}

body[data-mode="academic"] .hero h1 span {
  color: var(--text-1);
  background: none;
}

.hero-sub {
  max-width: 640px;
  margin-top: 26px;
  color: var(--text-2);
  font-size: clamp(1.05rem, 1.5vw, 1.28rem);
  line-height: 1.7;
}

.hero-mode {
  margin-top: 28px;
}

.hero-mode button {
  padding: 11px 16px;
  display: inline-flex;
  flex-direction: column;
  gap: 3px;
  align-items: flex-start;
}

.hero-mode small {
  font-family: var(--font-mono);
  font-size: 0.64rem;
  opacity: 0.72;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.hero-proof-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 34px;
  color: var(--text-3);
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
}

.hero-proof-row span {
  padding: 6px 9px;
  border: 1px solid var(--hairline);
  border-radius: var(--radius-pill);
  background: rgba(var(--page-rgb), 0.35);
}

.hero-panel {
  position: relative;
  padding: 22px;
  border: 1px solid var(--hairline-strong);
  border-radius: var(--radius-xl);
  background: var(--surface);
  box-shadow: var(--shadow-panel);
  backdrop-filter: blur(20px);
  overflow: hidden;
}

.hero-panel::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 80% 10%, color-mix(in srgb, var(--mode-accent) 18%, transparent), transparent 38%),
    linear-gradient(to right, var(--grid-line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--grid-line) 1px, transparent 1px);
  background-size: auto, 30px 30px, 30px 30px;
  pointer-events: none;
}

.hero-panel > * {
  position: relative;
  z-index: 1;
}

.panel-topline,
.chart-head {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  color: var(--text-3);
  font-family: var(--font-mono);
  font-size: 0.72rem;
}

.panel-title {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 18px;
  margin-top: 18px;
}

.panel-title p {
  color: var(--text-3);
  font-size: var(--fs-micro);
}

.panel-title h2 {
  margin-top: 5px;
  font-size: clamp(1.25rem, 2vw, 1.7rem);
}

.live-chip {
  display: inline-flex;
  align-items: center;
  padding: 5px 9px;
  border-radius: var(--radius-pill);
  color: var(--mode-accent);
  border: 1px solid color-mix(in srgb, var(--mode-accent) 35%, transparent);
  font-family: var(--font-mono);
  font-size: 0.68rem;
}

.panel-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin-top: 18px;
}

.metric,
.chart-card,
.workflow-grid article,
.adapter-grid article,
.template-card,
.example-card,
.nl-preview,
.code-block {
  border: 1px solid var(--hairline);
  background: var(--surface-soft);
  border-radius: var(--radius);
}

.metric {
  padding: 12px;
}

.metric span {
  display: block;
  color: var(--text-3);
  font-family: var(--font-mono);
  font-size: 0.68rem;
}

.metric strong {
  display: block;
  margin-top: 5px;
  color: var(--text-1);
  font-family: var(--font-mono);
  font-size: 1.45rem;
  line-height: 1;
}

.chart-card {
  padding: 14px;
}

.chart-card.large {
  margin-top: 12px;
}

.chart-card svg {
  width: 100%;
  height: auto;
}

.chart-row {
  display: grid;
  grid-template-columns: 0.84fr 1fr;
  gap: 12px;
  margin-top: 12px;
}

.metrics-band {
  padding-block: 0 74px;
}

.metrics-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border: 1px solid var(--hairline);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--hairline);
}

.metrics-grid div {
  padding: 30px 24px;
  background: rgba(var(--page-rgb), 0.76);
  text-align: center;
}

.metrics-grid strong {
  display: block;
  color: var(--mode-accent);
  font-family: var(--font-mono);
  font-size: clamp(2rem, 4vw, 3.2rem);
  line-height: 1;
}

.metrics-grid span {
  display: block;
  margin-top: 10px;
  color: var(--text-2);
  font-size: var(--fs-small);
}

.two-col {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(0, 1fr);
  gap: clamp(32px, 6vw, 80px);
  align-items: start;
}

.intro-copy {
  display: grid;
  gap: 18px;
  color: var(--text-2);
  font-size: 1.13rem;
}

.workflow-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 14px;
}

.workflow-grid article,
.adapter-grid article,
.template-card,
.example-card {
  padding: 22px;
  transition: transform 0.22s var(--ease), border-color 0.22s var(--ease), background 0.22s var(--ease);
}

.workflow-grid article:hover,
.adapter-grid article:hover,
.template-card:hover,
.example-card:hover {
  transform: translateY(-3px);
  border-color: var(--hairline-strong);
}

.workflow-grid span {
  color: var(--mode-accent);
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
}

.workflow-grid h3 {
  margin-top: 18px;
  font-size: 1.25rem;
}

.workflow-grid p,
.adapter-grid p,
.template-card p,
.example-card p {
  margin-top: 10px;
  color: var(--text-2);
  font-size: var(--fs-small);
  line-height: 1.6;
}

.filter-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 26px;
}

.chip {
  padding: 8px 14px;
  border: 1px solid var(--hairline);
  border-radius: var(--radius-pill);
  color: var(--text-2);
  background: var(--surface-soft);
  font-size: var(--fs-small);
}

.chip.active {
  color: #fff;
  background: var(--brand-grad);
  border-color: transparent;
}

.template-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.template-card {
  min-height: 190px;
  text-align: left;
  color: var(--text-1);
}

.template-card .glyph {
  height: 76px;
  margin-bottom: 16px;
  border-radius: var(--radius-sm);
  background: rgba(var(--page-rgb), 0.48);
  display: grid;
  place-items: center;
  overflow: hidden;
}

.template-card .glyph svg {
  width: 84%;
  height: 84%;
}

.template-card small,
.adapter-grid span,
.example-card span {
  color: var(--text-3);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.modal {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.modal.open { display: flex; }

.modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.62);
  backdrop-filter: blur(8px);
}

.modal-card {
  position: relative;
  width: min(680px, 100%);
  max-height: 86vh;
  overflow: auto;
  padding: 28px;
  border: 1px solid var(--hairline-strong);
  border-radius: var(--radius-lg);
  background: var(--surface-strong);
  box-shadow: var(--shadow-panel);
}

.modal-close {
  position: absolute;
  top: 14px;
  right: 14px;
  width: 34px;
  height: 34px;
  border: 1px solid var(--hairline);
  border-radius: var(--radius-sm);
  font-size: 1.3rem;
}

.m-glyph {
  min-height: 160px;
  margin-bottom: 18px;
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  background: rgba(var(--page-rgb), 0.38);
  display: grid;
  place-items: center;
}

.m-glyph svg { width: 78%; height: 140px; }
.m-cat { color: var(--text-3); font-family: var(--font-mono); font-size: var(--fs-micro); }
.m-body { margin-top: 14px; color: var(--text-2); font-size: var(--fs-small); }
.m-body h4 { margin-top: 18px; color: var(--text-1); }

.theme-demo {
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr);
  gap: 22px;
  align-items: start;
}

.theme-picker {
  display: grid;
  gap: 10px;
}

.theme-opt {
  padding: 15px 16px;
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  background: var(--surface-soft);
  text-align: left;
}

.theme-opt span { display: block; font-weight: 700; }
.theme-opt small { color: var(--text-3); }
.theme-opt.active { border-color: var(--mode-accent); box-shadow: 0 0 0 1px color-mix(in srgb, var(--mode-accent) 32%, transparent); }

.theme-canvas {
  padding: 24px;
  border: 1px solid var(--hairline-strong);
  border-radius: var(--radius-xl);
  background: var(--t-page);
  color: var(--t-text-1);
}

.theme-canvas-head {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 18px;
}

.theme-canvas-head span {
  color: var(--t-text-3);
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
}

.theme-chart-grid {
  display: grid;
  grid-template-columns: 1.35fr 1fr 1fr;
  gap: 12px;
}

.theme-cell {
  padding: 14px;
  border: 1px solid var(--t-border);
  border-radius: var(--radius);
  background: var(--t-chart);
}

.theme-cell.span2 { grid-column: span 2; }
.theme-cell p { color: var(--t-text-3); font-family: var(--font-mono); font-size: 0.72rem; margin-bottom: 8px; }
.palette-row { display: flex; flex-wrap: wrap; gap: 7px; margin-top: 16px; }
.palette-row i { width: 28px; height: 28px; border-radius: 8px; border: 1px solid rgba(0,0,0,0.08); }

.adapter-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.adapter-grid strong {
  display: block;
  font-size: 1.25rem;
}

.nl-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(0, 1fr);
  gap: clamp(30px, 5vw, 70px);
  align-items: start;
}

.nl-demo {
  display: grid;
  gap: 14px;
}

.nl-phrases {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.nl-phrase {
  padding: 10px 13px;
  border: 1px solid var(--hairline);
  border-radius: var(--radius-pill);
  color: var(--text-2);
  background: var(--surface-soft);
  font-size: var(--fs-small);
}

.nl-phrase.active {
  color: #fff;
  background: var(--brand-grad);
  border-color: transparent;
}

.nl-preview {
  padding: 18px;
}

.nl-mapping {
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px dashed var(--hairline);
  color: var(--text-2);
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
}

.example-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.example-preview {
  height: 180px;
  margin: -8px -8px 18px;
  border-radius: var(--radius);
  background: rgba(var(--page-rgb), 0.5);
  overflow: hidden;
}

.example-preview svg { width: 100%; height: 100%; }

.start-layout {
  display: grid;
  gap: 18px;
}

.qs-tabs {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.qs-tab {
  padding: 10px 14px;
  border: 1px solid var(--hairline);
  border-radius: var(--radius-pill);
  color: var(--text-2);
}

.qs-tab.active {
  color: #fff;
  background: var(--brand-grad);
  border-color: transparent;
}

.qs-pane { display: none; }
.qs-pane.active { display: block; }

.code-block {
  overflow: hidden;
  background: rgba(var(--page-rgb), 0.62);
}

.cb-head {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 15px;
  border-bottom: 1px solid var(--hairline);
  color: var(--text-3);
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
}

.cb-copy {
  color: var(--text-2);
}

.code-block pre {
  margin: 0;
  overflow: auto;
  padding: 18px;
  color: var(--text-1);
  font-size: 0.9rem;
  line-height: 1.65;
}

.llms-strip {
  padding-bottom: 90px;
}

.llms-cta {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 24px;
  padding: 34px;
  border: 1px solid var(--hairline-strong);
  border-radius: var(--radius-xl);
  background: var(--surface);
  box-shadow: var(--shadow-panel);
}

.llms-cta h2 {
  font-size: clamp(1.45rem, 2.4vw, 2.1rem);
}

.llms-cta p {
  margin-top: 12px;
  max-width: 70ch;
  color: var(--text-2);
}

.footer {
  padding-block: 56px 40px;
  border-top: 1px solid var(--hairline);
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  align-items: flex-start;
}

.footer p {
  margin-top: 10px;
  color: var(--text-3);
  font-size: var(--fs-small);
}

.footer nav {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  color: var(--text-2);
  font-size: var(--fs-small);
}

@media (max-width: 1120px) {
  .nav-links,
  .nav-actions .mode-switch.compact { display: none; }
  .nav-burger { display: grid; }
  .hero-layout { grid-template-columns: 1fr; }
  .hero { min-height: auto; padding-top: 128px; }
  .hero-panel { max-width: 720px; }
  .workflow-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .template-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .theme-demo { grid-template-columns: 1fr; }
  .theme-picker { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .adapter-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .nl-layout { grid-template-columns: 1fr; }
}

@media (max-width: 760px) {
  .nav-actions .btn { display: none; }
  .hero {
    padding-top: 112px;
    padding-bottom: 58px;
  }
  .hero-bg {
    background-size: auto 100%, cover;
    background-position: center top, var(--hero-position);
  }
  .hero h1 {
    font-size: clamp(3rem, 17vw, 5.1rem);
    letter-spacing: -0.065em;
  }
  .hero-sub {
    font-size: 1rem;
    max-width: 100%;
  }
  .hero-mode {
    width: 100%;
  }
  .hero-mode button {
    flex: 1;
    align-items: center;
  }
  .hero-actions .btn {
    flex: 1 1 180px;
  }
  .hero-panel {
    padding: 16px;
    border-radius: 20px;
  }
  .panel-grid,
  .metrics-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .chart-row {
    grid-template-columns: 1fr;
  }
  .two-col,
  .workflow-grid,
  .template-grid,
  .theme-chart-grid,
  .adapter-grid,
  .example-grid,
  .llms-cta {
    grid-template-columns: 1fr;
  }
  .theme-cell.span2 { grid-column: span 1; }
  .theme-picker {
    display: flex;
    overflow-x: auto;
    padding-bottom: 4px;
  }
  .theme-opt {
    min-width: 180px;
  }
  .footer-inner {
    flex-direction: column;
  }
}

@media (max-width: 480px) {
  .nav-inner { height: 66px; }
  .mobile-menu { top: 66px; }
  .nav-brand img { width: 104px; height: auto; }
  .vtag { display: none; }
  .hero {
    padding-top: 96px;
  }
  .hero-bg {
    background-position: center top, 62% top;
  }
  body[data-mode="academic"] .hero-bg {
    background-position: center top, 70% top;
  }
  .hero-kicker {
    max-width: 100%;
    font-size: 0.84rem;
  }
  .hero h1 {
    font-size: clamp(2.75rem, 18vw, 4.25rem);
  }
  .mode-switch {
    display: flex;
    width: 100%;
  }
  .mode-switch button {
    flex: 1;
    padding-inline: 10px;
    text-align: center;
  }
  .panel-title {
    flex-direction: column;
  }
  .panel-grid,
  .metrics-grid {
    grid-template-columns: 1fr;
  }
  .metrics-grid div {
    padding: 22px 18px;
  }
  .workflow-grid article,
  .adapter-grid article,
  .template-card,
  .example-card,
  .llms-cta {
    padding: 18px;
  }
  .code-block pre {
    font-size: 0.8rem;
  }
}