/* ==========================================================================
   LeinGPT - /gemini-omni (Gemini Omni 1.1 Flash)
   Concept 2: Swiss Motion-Physics Stroboscope & Chronophotography Lab
   Palette: Titanium Lab Paper #F6F8FA, Klein Blue #0047AB,
            Signal Vermilion #E63946, Dark Graphite #11161C
   ========================================================================== */

:root {
  --go-bg: #F6F8FA;
  --go-paper: #FFFFFF;
  --go-panel: #EDF2F7;
  --go-ink: #11161C;
  --go-muted: #475569;
  --go-blue: #0047AB;
  --go-blue-soft: #DBEAFE;
  --go-vermilion: #E63946;
  --go-vermilion-soft: #FEE2E2;
  --go-line: #CBD5E1;
  --go-line-strong: #11161C;
  --go-mono: 'IBM Plex Mono', monospace;
  --go-display: 'Space Grotesk', 'Inter', sans-serif;
  --go-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body.go-body {
  margin: 0;
  background-color: var(--go-bg);
  background-image:
    linear-gradient(to right, rgba(0, 71, 171, 0.05) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(0, 71, 171, 0.05) 1px, transparent 1px);
  background-size: 32px 32px;
  color: var(--go-ink);
  font-family: var(--go-sans);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

.go-sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.go-skip-link {
  position: absolute;
  top: -100px;
  left: 16px;
  z-index: 999;
  background: var(--go-vermilion);
  color: #FFFFFF;
  padding: 10px 16px;
  font-family: var(--go-mono);
  font-weight: 700;
  text-decoration: none;
}

.go-skip-link:focus {
  top: 12px;
}

.go-container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Top Millimeter Stroboscope Calibration Ruler */
.go-ruler-bar {
  background: var(--go-ink);
  color: #F8FAFC;
  border-bottom: 2px solid var(--go-blue);
  font-family: var(--go-mono);
  font-size: 0.75rem;
}

.go-ruler-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-top: 8px;
  padding-bottom: 8px;
  flex-wrap: wrap;
}

.go-ruler-ticks {
  display: flex;
  align-items: center;
  gap: 18px;
  color: #94A3B8;
  letter-spacing: 0.05em;
}

.go-ruler-ticks span {
  position: relative;
  padding-left: 8px;
  border-left: 1px solid #475569;
}

.go-ruler-pills {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.go-lab-pill {
  padding: 3px 9px;
  border: 1px solid #334155;
  background: #1E293B;
  color: #F8FAFC;
  font-weight: 600;
}

.go-lab-pill--blue {
  background: var(--go-blue);
  border-color: #3B82F6;
}

.go-lab-pill--vermilion {
  background: var(--go-vermilion);
  border-color: #F87171;
  font-weight: 700;
}

/* Header */
.go-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: rgba(246, 248, 250, 0.95);
  backdrop-filter: blur(8px);
  border-bottom: 2px solid var(--go-line-strong);
}

.go-header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 66px;
  flex-wrap: wrap;
}

.go-brand-row {
  display: flex;
  align-items: center;
  gap: 10px;
}

.go-brand-logo {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  color: var(--go-ink);
  font-family: var(--go-display);
  font-weight: 700;
  font-size: 1.15rem;
}

.go-brand-box {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  background: var(--go-blue);
  color: #FFFFFF;
  font-family: var(--go-mono);
  font-weight: 700;
}

.go-brand-slash {
  color: var(--go-vermilion);
  font-family: var(--go-mono);
  font-weight: 700;
}

.go-brand-crumb {
  font-family: var(--go-mono);
  font-size: 0.86rem;
  font-weight: 600;
  color: var(--go-blue);
}

.go-nav {
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
}

.go-nav-link {
  color: var(--go-ink);
  text-decoration: none;
  font-size: 0.88rem;
  font-weight: 600;
  padding: 4px 0;
  border-bottom: 2px solid transparent;
}

.go-nav-link:hover {
  color: var(--go-blue);
  border-bottom-color: var(--go-vermilion);
}

.go-header-right {
  display: flex;
  align-items: center;
  gap: 10px;
}

.go-lang-select {
  appearance: none;
  background: var(--go-paper);
  color: var(--go-ink);
  border: 1.5px solid var(--go-line-strong);
  padding: 7px 12px;
  font-family: var(--go-mono);
  font-size: 0.78rem;
  font-weight: 600;
  cursor: pointer;
}

.go-btn-top {
  display: inline-flex;
  align-items: center;
  background: var(--go-ink);
  color: #FFFFFF;
  text-decoration: none;
  font-family: var(--go-mono);
  font-size: 0.8rem;
  font-weight: 700;
  padding: 9px 14px;
  border: 1.5px solid var(--go-ink);
  transition: background 0.15s ease;
}

.go-btn-top:hover {
  background: var(--go-blue);
  border-color: var(--go-blue);
}

/* Hero & Stroboscope Centerpiece */
.go-hero {
  padding: 28px 0 56px;
  border-bottom: 2px solid var(--go-line-strong);
}

.go-crumbs {
  font-family: var(--go-mono);
  font-size: 0.78rem;
  color: var(--go-muted);
  margin-bottom: 16px;
}

.go-crumbs a {
  color: var(--go-blue);
  text-decoration: none;
  font-weight: 600;
}

.go-kicker-strip {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 14px;
}

.go-kicker-badge {
  background: var(--go-blue);
  color: #FFFFFF;
  font-family: var(--go-mono);
  font-size: 0.76rem;
  font-weight: 700;
  padding: 4px 10px;
  text-transform: uppercase;
}

.go-kicker-tag {
  background: var(--go-vermilion-soft);
  color: var(--go-vermilion);
  border: 1px solid var(--go-vermilion);
  font-family: var(--go-mono);
  font-size: 0.76rem;
  font-weight: 700;
  padding: 3px 10px;
}

.go-kicker-physics {
  font-family: var(--go-mono);
  font-size: 0.76rem;
  color: var(--go-muted);
  font-weight: 600;
}

.go-h1 {
  font-family: var(--go-display);
  font-size: clamp(2.1rem, 4.2vw, 3.6rem);
  line-height: 1.08;
  letter-spacing: -0.025em;
  margin: 0 0 16px;
  color: var(--go-ink);
}

.go-h1 em {
  font-style: normal;
  color: var(--go-blue);
  border-bottom: 4px solid var(--go-vermilion);
}

.go-lead {
  font-size: 1.08rem;
  color: var(--go-muted);
  max-width: 880px;
  margin: 0 0 22px;
}

.go-hero-actions {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 24px;
}

.go-btn-vermilion {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  background: var(--go-vermilion);
  color: #FFFFFF;
  text-decoration: none;
  font-family: var(--go-display);
  font-weight: 700;
  font-size: 1rem;
  padding: 13px 22px;
  border: 2px solid var(--go-ink);
  box-shadow: 4px 4px 0 var(--go-ink);
  transition: transform 0.12s ease, box-shadow 0.12s ease;
}

.go-btn-vermilion:hover {
  transform: translate(-2px, -2px);
  box-shadow: 6px 6px 0 var(--go-ink);
}

.go-btn-sub {
  background: var(--go-ink);
  color: #FFFFFF;
  font-family: var(--go-mono);
  font-size: 0.76rem;
  padding: 3px 8px;
}

.go-btn-outline {
  display: inline-flex;
  align-items: center;
  background: var(--go-paper);
  color: var(--go-ink);
  text-decoration: none;
  font-family: var(--go-mono);
  font-weight: 700;
  font-size: 0.9rem;
  padding: 13px 18px;
  border: 2px solid var(--go-ink);
}

.go-btn-outline:hover {
  background: var(--go-blue-soft);
  border-color: var(--go-blue);
}

/* 4 Key Facts Row */
.go-facts-row {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  margin-bottom: 28px;
}

.go-fact-box {
  background: var(--go-paper);
  border: 1.5px solid var(--go-line-strong);
  padding: 12px 16px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.go-fact-val {
  font-family: var(--go-mono);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--go-blue);
}

.go-fact-label {
  font-size: 0.83rem;
  color: var(--go-muted);
}

/* 5-Frame Chronophotography Stroboscope Card */
.go-stroboscope-card {
  background: var(--go-paper);
  border: 2px solid var(--go-line-strong);
  box-shadow: 6px 6px 0 var(--go-ink);
  padding: 22px;
}

.go-stroboscope-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  padding-bottom: 16px;
  border-bottom: 1.5px solid var(--go-line);
}

.go-stroboscope-code {
  display: block;
  font-family: var(--go-mono);
  font-size: 0.74rem;
  font-weight: 700;
  color: var(--go-vermilion);
  letter-spacing: 0.06em;
  margin-bottom: 4px;
}

.go-stroboscope-h2 {
  font-family: var(--go-display);
  font-size: 1.3rem;
  margin: 0;
}

.go-mode-Preset-tabs {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.go-mode-tab {
  background: var(--go-panel);
  color: var(--go-ink);
  border: 1.5px solid var(--go-line-strong);
  font-family: var(--go-mono);
  font-size: 0.78rem;
  font-weight: 700;
  padding: 8px 12px;
  cursor: pointer;
}

.go-mode-tab.is-active {
  background: var(--go-blue);
  color: #FFFFFF;
  border-color: var(--go-ink);
}

/* Active Telemetry Bar */
.go-telemetry-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  flex-wrap: wrap;
  background: var(--go-panel);
  border: 1.5px solid var(--go-line);
  padding: 11px 14px;
  margin: 14px 0;
}

.go-telemetry-prompt {
  font-size: 0.9rem;
}

.go-telemetry-label {
  font-family: var(--go-mono);
  font-size: 0.78rem;
  color: var(--go-muted);
  margin-right: 6px;
}

.go-telemetry-badges {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.go-t-badge {
  font-family: var(--go-mono);
  font-size: 0.74rem;
  font-weight: 700;
  padding: 3px 8px;
  background: #FFFFFF;
  border: 1px solid var(--go-blue);
  color: var(--go-blue);
}

/* Perforated 35mm 5-Frame Filmstrip */
.go-filmstrip {
  border: 2px solid var(--go-ink);
  background: var(--go-ink);
  color: #FFFFFF;
}

.go-filmstrip-rail {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 14px;
  font-family: var(--go-mono);
  font-size: 0.72rem;
  letter-spacing: 0.05em;
  color: #CBD5E1;
}

.go-sprockets {
  display: inline-flex;
  gap: 8px;
}

.go-sprockets i {
  display: inline-block;
  width: 10px;
  height: 6px;
  background: #F8FAFC;
  border-radius: 1px;
}

.go-frames-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 2px;
  background: var(--go-ink);
  border-top: 2px solid var(--go-ink);
  border-bottom: 2px solid var(--go-ink);
}

.go-frame {
  background: #FFFFFF;
  color: var(--go-ink);
  padding: 12px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.go-frame-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 6px;
  margin-bottom: 8px;
}

.go-frame-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  background: var(--go-ink);
  color: #FFFFFF;
  font-family: var(--go-mono);
  font-size: 0.8rem;
  font-weight: 700;
}

.go-num-blue {
  background: var(--go-blue);
}

.go-num-vermilion {
  background: var(--go-vermilion);
}

.go-frame-tag {
  font-family: var(--go-mono);
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--go-muted);
}

.go-tag-blue {
  color: var(--go-blue);
}

.go-tag-vermilion {
  color: var(--go-vermilion);
}

.go-frame-svg {
  width: 100%;
  height: auto;
  border: 1.5px solid var(--go-ink);
  display: block;
}

.go-frame-caption {
  font-size: 0.79rem;
  color: var(--go-ink);
  margin: 8px 0 0;
  line-height: 1.4;
}

/* Synchronized Audio Spectrogram Bar */
.go-spectrogram-wrap {
  margin-top: 16px;
  border: 1.5px solid var(--go-ink);
  background: #EEF2F6;
  padding: 10px 14px;
}

.go-spectrogram-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 6px;
}

.go-spec-title {
  font-family: var(--go-mono);
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--go-ink);
}

.go-spec-meta {
  font-family: var(--go-mono);
  font-size: 0.74rem;
  font-weight: 600;
  color: var(--go-blue);
}

.go-spectrogram-svg {
  width: 100%;
  height: auto;
  display: block;
}

/* Sections */
.go-section {
  padding: 56px 0;
  border-bottom: 2px solid var(--go-line-strong);
}

.go-section-head {
  margin-bottom: 28px;
}

.go-section-tag {
  display: inline-block;
  font-family: var(--go-mono);
  font-size: 0.76rem;
  font-weight: 700;
  color: var(--go-blue);
  background: var(--go-blue-soft);
  border: 1px solid var(--go-blue);
  padding: 3px 9px;
  margin-bottom: 10px;
}

.go-section-h2 {
  font-family: var(--go-display);
  font-size: clamp(1.65rem, 3vw, 2.35rem);
  margin: 0 0 10px;
  line-height: 1.15;
}

.go-section-h2 em {
  font-style: normal;
  color: var(--go-vermilion);
}

.go-section-sub {
  font-size: 1rem;
  color: var(--go-muted);
  max-width: 820px;
  margin: 0;
}

/* 6 Use Cases Grid */
.go-usecases-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.go-uc-card {
  background: var(--go-paper);
  border: 2px solid var(--go-line-strong);
  padding: 20px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.go-uc-index {
  font-family: var(--go-mono);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--go-vermilion);
  margin-bottom: 8px;
}

.go-uc-title {
  font-family: var(--go-display);
  font-size: 1.15rem;
  margin: 0 0 8px;
}

.go-uc-desc {
  font-size: 0.92rem;
  color: var(--go-muted);
  margin: 0 0 14px;
}

.go-uc-prompt {
  background: var(--go-panel);
  border-left: 3px solid var(--go-blue);
  padding: 8px 10px;
  font-size: 0.82rem;
}

.go-uc-prompt-label {
  font-family: var(--go-mono);
  font-weight: 700;
  color: var(--go-blue);
  margin-right: 4px;
}

.go-uc-prompt code {
  font-family: var(--go-mono);
  color: var(--go-ink);
}

/* 3-Column Comparative Tariff Ledger (Concept 2 Mockup) */
.go-ledger-triptych {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border: 2px solid var(--go-ink);
  background: var(--go-paper);
  box-shadow: 5px 5px 0 var(--go-ink);
  margin-bottom: 28px;
}

.go-ledger-col {
  border-right: 1.5px solid var(--go-ink);
  display: flex;
  flex-direction: column;
}

.go-ledger-col:last-child {
  border-right: none;
}

.go-ledger-head {
  background: var(--go-panel);
  border-bottom: 1.5px solid var(--go-ink);
  padding: 12px 18px;
  font-family: var(--go-display);
  font-weight: 700;
  font-size: 1.05rem;
}

.go-ledger-col--featured .go-ledger-head {
  background: var(--go-blue);
  color: #FFFFFF;
}

.go-ledger-body {
  padding: 20px 18px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  flex: 1;
}

.go-ledger-price {
  font-family: var(--go-mono);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--go-ink);
}

.go-ledger-col--featured .go-ledger-price {
  color: var(--go-vermilion);
}

.go-ledger-note {
  font-size: 0.9rem;
  color: var(--go-muted);
  margin: 0;
}

.go-ledger-badge {
  margin-top: auto;
  display: inline-block;
  font-family: var(--go-mono);
  font-size: 0.76rem;
  font-weight: 700;
  color: var(--go-blue);
  background: var(--go-blue-soft);
  padding: 4px 8px;
}

/* Comparison Table */
.go-table-wrap {
  overflow-x: auto;
  margin-bottom: 24px;
}

.go-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--go-paper);
  border: 2px solid var(--go-ink);
}

.go-table th,
.go-table td {
  padding: 13px 16px;
  border: 1px solid var(--go-line);
  text-align: start;
  font-size: 0.92rem;
}

.go-table thead th {
  background: var(--go-ink);
  color: #FFFFFF;
  font-family: var(--go-mono);
  font-size: 0.82rem;
}

.go-td-highlight {
  background: #EFF6FF;
  color: var(--go-blue);
}

/* Prices Strip */
.go-prices-strip {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 12px;
  margin-bottom: 12px;
}

.go-price-item {
  background: var(--go-paper);
  border: 1.5px solid var(--go-ink);
  padding: 12px 14px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.go-price-name {
  font-size: 0.82rem;
  color: var(--go-muted);
}

.go-price-val {
  font-family: var(--go-mono);
  font-size: 1.1rem;
  color: var(--go-ink);
}

.go-price-footnote {
  font-size: 0.86rem;
  color: var(--go-muted);
  margin: 0;
}

/* Steps & Why */
.go-steps-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin-bottom: 32px;
}

.go-step-card {
  background: var(--go-paper);
  border: 2px solid var(--go-ink);
  padding: 20px;
}

.go-step-num {
  display: inline-block;
  font-family: var(--go-mono);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--go-vermilion);
  margin-bottom: 8px;
}

.go-step-p {
  margin: 0;
  font-size: 0.94rem;
}

.go-why-wrap {
  border-top: 1.5px dashed var(--go-line-strong);
  padding-top: 24px;
}

.go-why-sub {
  font-family: var(--go-mono);
  font-weight: 700;
  margin: 0 0 14px;
}

.go-why-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.go-why-card {
  background: var(--go-paper);
  border: 1.5px solid var(--go-ink);
  padding: 16px;
}

.go-why-title {
  font-family: var(--go-display);
  font-size: 1.02rem;
  margin: 0 0 6px;
}

.go-why-desc {
  margin: 0;
  font-size: 0.88rem;
  color: var(--go-muted);
}

/* FAQ */
.go-faq-list {
  display: grid;
  gap: 12px;
}

.go-faq-item {
  background: var(--go-paper);
  border: 1.5px solid var(--go-ink);
  padding: 14px 18px;
}

.go-faq-q {
  font-family: var(--go-display);
  font-weight: 700;
  font-size: 1.02rem;
  cursor: pointer;
}

.go-faq-a p {
  margin: 10px 0 0;
  color: var(--go-muted);
  font-size: 0.93rem;
}

/* Final Card & Related */
.go-final-card {
  background: var(--go-paper);
  border: 2px solid var(--go-ink);
  box-shadow: 6px 6px 0 var(--go-blue);
  padding: 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
  margin-bottom: 24px;
}

.go-final-h2 {
  font-family: var(--go-display);
  font-size: 1.75rem;
  margin: 6px 0 8px;
}

.go-final-h2 em {
  font-style: normal;
  color: var(--go-blue);
}

.go-final-p {
  margin: 0;
  color: var(--go-muted);
  max-width: 680px;
}

.go-related-row {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.go-related-label {
  font-family: var(--go-mono);
  font-size: 0.82rem;
  font-weight: 700;
}

.go-related-links {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.go-related-pill {
  background: var(--go-paper);
  color: var(--go-ink);
  border: 1.5px solid var(--go-ink);
  padding: 6px 12px;
  font-family: var(--go-mono);
  font-size: 0.8rem;
  font-weight: 600;
  text-decoration: none;
}

.go-related-pill:hover {
  background: var(--go-blue);
  color: #FFFFFF;
}

/* Footer */
.go-footer {
  background: var(--go-ink);
  color: #E2E8F0;
  padding: 28px 0;
  font-size: 0.86rem;
}

.go-footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.go-footer-links {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.go-footer-links a {
  color: #E2E8F0;
  text-decoration: none;
  font-family: var(--go-mono);
  font-size: 0.8rem;
}

/* Responsive */
@media (max-width: 1024px) {
  .go-frames-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .go-usecases-grid,
  .go-ledger-triptych,
  .go-steps-grid {
    grid-template-columns: 1fr;
  }
  .go-ledger-col {
    border-right: none;
    border-bottom: 1.5px solid var(--go-ink);
  }
}

@media (max-width: 680px) {
  .go-facts-row,
  .go-frames-grid,
  .go-why-grid {
    grid-template-columns: 1fr;
  }
}