:root {
  --bg-primary: #171717;
  --bg-secondary: #202432;
  --bg-tertiary: #353b41;
  --text-primary: #ffffff;
  --text-secondary: #697077;
  --text-muted: #4a4f55;
  --accent: #7aabff;
  --accent-subtle: rgba(122, 171, 255, 0.1);
  --green: #42be65;
  --yellow: #f1c21b;
  --red: #fa4d56;
  --border: #353b41;
  --radius: 4px;
  --font-ui: "IBM Plex Sans", sans-serif;
  --font-mono: "IBM Plex Mono", monospace;
  --container: 1120px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-ui);
  line-height: 1.5;
}

a {
  color: var(--text-primary);
  text-decoration: none;
}

.container {
  width: min(var(--container), calc(100% - 48px));
  margin: 0 auto;
}

.mono {
  font-family: var(--font-mono);
}

.muted {
  color: var(--text-secondary);
}

/* Nav */
.top-nav {
  height: 48px;
  position: sticky;
  top: 0;
  z-index: 20;
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 10px;
  min-width: 0;
}

.brand-title {
  font-weight: 600;
  letter-spacing: 0.2px;
}

.brand-subtitle {
  color: var(--text-secondary);
  font-weight: 400;
  font-size: 13px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 8px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  color: var(--text-secondary);
  font-size: 13px;
}

.nav-link:hover {
  border-color: var(--border);
  color: var(--text-primary);
}

.icon {
  width: 16px;
  height: 16px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 32px;
  padding: 0 12px;
  border-radius: var(--radius);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.2px;
}

.btn-outline {
  border: 1px solid var(--accent);
  color: var(--accent);
  background: transparent;
}

.btn-outline:hover {
  background: var(--accent-subtle);
}

/* Hero */
.hero {
  min-height: calc(100vh - 48px);
  display: grid;
  align-items: center;
  position: relative;
  background: var(--bg-primary);
  padding: 60px 0 80px;
}

.hero-inner {
  text-align: center;
}

.hero-label {
  color: var(--text-secondary);
  font-size: 12px;
  letter-spacing: 2.2px;
  text-transform: uppercase;
  margin-bottom: 16px;
}

.hero-title {
  font-size: 56px;
  line-height: 1.05;
  margin: 0 0 10px;
  font-weight: 600;
}

.hero-subtitle {
  font-size: 24px;
  font-weight: 300;
  color: var(--text-secondary);
  line-height: 1.6;
  margin: 0 auto 28px;
  max-width: 720px;
}

.hero-commands {
  display: grid;
  gap: 12px;
  max-width: 820px;
  margin: 0 auto 18px;
}

.command-box {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 10px 12px;
}

.command-box code {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-primary);
  text-align: left;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.copy-btn {
  font-family: var(--font-ui);
  font-size: 12px;
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 6px 10px;
  cursor: pointer;
  flex: 0 0 auto;
}

.copy-btn:hover {
  color: var(--text-primary);
  border-color: var(--accent);
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin: 18px auto 0;
  max-width: 980px;
}

.stat-pill {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-left: 2px solid var(--red);
  border-radius: var(--radius);
  padding: 10px 12px;
  text-align: left;
}

.pill-text {
  font-size: 12px;
  color: var(--text-primary);
}

.scroll-indicator {
  position: absolute;
  left: 50%;
  bottom: 18px;
  transform: translateX(-50%);
  width: 2px;
  height: 34px;
  background: rgba(122, 171, 255, 0.18);
  border-radius: var(--radius);
  overflow: hidden;
}

.scroll-line {
  width: 100%;
  height: 100%;
  background: var(--accent);
  transform: scaleY(0);
  animation: scroll-indicator 1.4s ease-in-out infinite;
}

/* Sections */
.section {
  padding: 72px 0;
  border-top: 1px solid var(--border);
}

.section-head {
  max-width: 900px;
  margin: 0 0 28px;
}

.section-title {
  margin: 0 0 10px;
  font-size: 36px;
  font-weight: 600;
}

.section-subtitle {
  margin: 0;
  color: var(--text-secondary);
  font-size: 16px;
}

/* Timeline */
.timeline {
  margin: 22px 0 26px;
  padding: 18px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.timeline-row {
  display: grid;
  grid-template-columns: 1fr 40px 1.2fr 40px 1fr 40px 1fr;
  gap: 10px;
  align-items: center;
}

.timeline-box {
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px 12px;
  color: var(--text-primary);
  font-size: 13px;
  text-align: center;
}

.timeline-box-unknown {
  background: var(--bg-primary);
  border: 1px solid var(--red);
  text-align: left;
}

.unknown-title {
  font-size: 11px;
  letter-spacing: 1.2px;
  text-transform: uppercase;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

.unknown-body {
  font-size: 12px;
  color: var(--text-primary);
  line-height: 1.45;
}

.timeline-connector {
  height: 1px;
  background: var(--border);
  position: relative;
}

.timeline-connector::after {
  content: "";
  position: absolute;
  right: -2px;
  top: 50%;
  transform: translateY(-50%);
  width: 0;
  height: 0;
  border-left: 6px solid var(--border);
  border-top: 4px solid transparent;
  border-bottom: 4px solid transparent;
}

.pulse-red {
  animation: pulse-border 2.4s ease-in-out infinite;
}

.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}

.col {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
}

.col-title {
  margin: 0 0 10px;
  font-size: 14px;
  font-weight: 600;
}

.feature-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 10px;
}

.feature-item {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  color: var(--text-primary);
  font-size: 13px;
}

.feature-item .marker {
  width: 14px;
  height: 14px;
  border: 1px solid var(--border);
  background: var(--bg-primary);
  border-radius: var(--radius);
  margin-top: 2px;
  position: relative;
  flex: 0 0 auto;
}

.feature-item.x .marker {
  border-color: var(--red);
}

.feature-item.x .marker::before,
.feature-item.x .marker::after {
  content: "";
  position: absolute;
  left: 2px;
  right: 2px;
  top: 50%;
  height: 1px;
  background: var(--red);
}

.feature-item.x .marker::before {
  transform: rotate(45deg);
}

.feature-item.x .marker::after {
  transform: rotate(-45deg);
}

.feature-item.check .marker {
  border-color: var(--green);
}

.feature-item.check .marker::before {
  content: "";
  position: absolute;
  width: 7px;
  height: 3px;
  border-left: 2px solid var(--green);
  border-bottom: 2px solid var(--green);
  left: 3px;
  top: 5px;
  transform: rotate(-45deg);
}

/* Steps */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
}

.step-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-left: 2px solid var(--accent);
  border-radius: var(--radius);
  padding: 14px 14px 16px;
  min-height: 154px;
}

.step-kicker {
  font-size: 11px;
  letter-spacing: 1.2px;
  text-transform: uppercase;
  color: var(--text-secondary);
  margin-bottom: 10px;
}

.step-code {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-primary);
  line-height: 1.5;
  white-space: normal;
}

.step-note {
  margin-top: 12px;
  color: var(--text-secondary);
  font-size: 13px;
}

.step-visual .visual-line {
  font-size: 13px;
  color: var(--text-primary);
}

.step-visual .visual-subtle {
  margin-top: 8px;
  color: var(--text-secondary);
  font-size: 12px;
}

/* Tabs */
.tabs {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.tab-bar {
  display: flex;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
}

.tab-btn {
  appearance: none;
  background: transparent;
  border: 0;
  color: var(--text-secondary);
  font-family: var(--font-ui);
  font-size: 13px;
  padding: 12px 14px;
  cursor: pointer;
  border-bottom: 2px solid transparent;
}

.tab-btn.active {
  color: var(--text-primary);
  border-bottom-color: var(--accent);
}

.tab-panels {
  padding: 16px;
}

.tab-panel {
  display: none;
}

.tab-panel.active {
  display: block;
}

/* Diff viewer */
.diff-viewer {
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.diff-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-secondary);
}

.diff-filename {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-primary);
}

.diff-badge {
  font-size: 10px;
  letter-spacing: 0.8px;
  text-transform: uppercase;
  color: var(--accent);
  border: 1px solid var(--accent);
  padding: 2px 8px;
  border-radius: var(--radius);
}

.diff-panels {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  border-bottom: 1px solid var(--border);
}

.diff-before,
.diff-after {
  padding: 10px 0 12px;
}

.diff-before {
  border-right: 1px solid var(--border);
}

.diff-panel-label {
  padding: 0 12px 8px;
  font-size: 10px;
  letter-spacing: 0.8px;
  text-transform: uppercase;
  color: var(--text-secondary);
}

.code-line {
  display: flex;
  gap: 10px;
  align-items: baseline;
  padding: 4px 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-primary);
}

.line-num {
  color: var(--text-secondary);
  min-width: 32px;
  text-align: right;
}

.line-marker {
  color: var(--text-secondary);
  min-width: 30px;
  text-align: center;
}

.line-code {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.code-line.added {
  background: rgba(66, 190, 101, 0.08);
  border-left: 2px solid var(--green);
  padding-left: 10px;
}

.code-line.changed {
  background: rgba(241, 194, 27, 0.08);
  border-left: 2px solid var(--yellow);
  padding-left: 10px;
}

.unified-diff {
  padding: 12px;
}

.diff-label {
  font-size: 10px;
  letter-spacing: 0.8px;
  text-transform: uppercase;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

.diff-line {
  font-family: var(--font-mono);
  font-size: 12px;
  padding: 3px 8px;
  border-radius: var(--radius);
}

.diff-line.hunk {
  color: var(--accent);
}

.diff-line.added {
  background: rgba(66, 190, 101, 0.08);
  border-left: 2px solid var(--green);
}

.diff-line.deleted {
  background: rgba(250, 77, 86, 0.08);
  border-left: 2px solid var(--red);
}

.diff-line.context {
  color: var(--text-secondary);
}

/* Flow */
.flow-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
  margin-bottom: 16px;
}

.flow-col-title {
  font-size: 10px;
  letter-spacing: 0.8px;
  text-transform: uppercase;
  color: var(--text-secondary);
  margin-bottom: 10px;
}

.flow-stack {
  display: grid;
  justify-items: center;
}

.flow-node {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 10px 14px;
  min-width: 240px;
  position: relative;
  cursor: pointer;
  outline: none;
}

.flow-node:hover {
  border-color: var(--accent);
}

.flow-node:focus-visible {
  outline: 1px solid var(--accent);
  outline-offset: 2px;
}

.flow-node.new {
  border-color: var(--green);
}

.flow-node.modified {
  border-color: var(--yellow);
}

.flow-node-type {
  font-size: 9px;
  font-family: var(--font-ui);
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.8px;
  margin-bottom: 4px;
}

.flow-node-label {
  font-size: 13px;
  font-family: var(--font-ui);
  font-weight: 500;
  color: var(--text-primary);
}

.flow-node-meta {
  font-size: 10px;
  font-family: var(--font-mono);
  color: var(--text-secondary);
  margin-top: 2px;
}

.flow-node-badge {
  display: inline-block;
  font-size: 9px;
  padding: 2px 6px;
  border-radius: var(--radius);
  font-family: var(--font-ui);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-top: 6px;
}

.badge-new {
  background: rgba(66, 190, 101, 0.15);
  color: var(--green);
}

.badge-modified {
  background: rgba(241, 194, 27, 0.15);
  color: var(--yellow);
}

.value-pill {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2px 10px;
  font-size: 10px;
  font-family: var(--font-mono);
  color: var(--text-secondary);
  display: inline-block;
  margin: 8px 0 0;
}

.flow-connector {
  width: 1px;
  height: 24px;
  background: var(--border);
  margin: 0 auto;
}

.flow-detail {
  border-top: 1px solid var(--border);
  padding-top: 14px;
}

.flow-detail-title {
  color: var(--text-secondary);
  font-size: 13px;
  margin-bottom: 10px;
}

.flow-detail-panel {
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px;
}

.detail-row + .detail-row {
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px solid var(--border);
}

.detail-label {
  font-size: 10px;
  letter-spacing: 0.8px;
  text-transform: uppercase;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

.detail-label.green {
  color: var(--green);
}

.detail-label.yellow {
  color: var(--yellow);
}

.detail-mono {
  margin: 0;
  white-space: pre-wrap;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-primary);
}

.detail-italic {
  font-style: italic;
  color: #cccccc;
  font-size: 13px;
}

/* Preview */
.preview-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.preview-panel {
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px;
}

.preview-panel.changed {
  border-color: var(--green);
}

.preview-label {
  font-size: 10px;
  letter-spacing: 0.8px;
  text-transform: uppercase;
  color: var(--text-secondary);
  margin-bottom: 10px;
}

.component-sim {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px;
}

.component-card {
  background: #ffffff;
  color: #111111;
  border: 1px solid #d0d3d6;
  border-radius: var(--radius);
  padding: 14px;
  max-width: 420px;
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.card-title {
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.star-badge img {
  width: 14px;
  height: 14px;
}

.card-role {
  color: #6b6f74;
  margin: 8px 0 12px;
  font-size: 13px;
}

.component-btn {
  border: 1px solid #b8bdc2;
  border-radius: var(--radius);
  padding: 8px 10px;
  background: #e6e9ec;
  color: #4a4f55;
  font-size: 13px;
  cursor: pointer;
}

.component-btn-muted {
  background: #e6e9ec;
  color: #4a4f55;
}

.component-btn-weird {
  background: orange;
  color: pink;
  border-color: #d97706;
}

.preview-footnote {
  margin-top: 12px;
  color: var(--text-secondary);
  font-size: 13px;
}

/* Integration cards */
.grid-2x2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.info-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
}

.info-header {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--accent);
  margin-bottom: 10px;
}

.info-body {
  color: var(--text-secondary);
  font-size: 13px;
  line-height: 1.6;
}

/* Export */
.export-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  align-items: start;
}

.export-body {
  color: var(--text-secondary);
  font-size: 14px;
  line-height: 1.7;
  margin: 0;
}

.json-mock {
  margin: 0;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-primary);
  min-height: 260px;
  white-space: pre-wrap;
}

.json-legend {
  display: flex;
  gap: 10px;
  margin-top: 10px;
  color: var(--text-secondary);
  font-size: 12px;
}

.legend-item.key {
  color: var(--accent);
}

.legend-item.string {
  color: var(--green);
}

.legend-item.number {
  color: var(--yellow);
}

/* Stats */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}

.big-stat {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-top: 2px solid var(--accent);
  border-radius: var(--radius);
  padding: 16px;
}

.big-number {
  font-family: var(--font-mono);
  font-size: 48px;
  line-height: 1.1;
  color: var(--accent);
  margin-bottom: 10px;
}

.big-label {
  color: var(--text-secondary);
  font-size: 13px;
  line-height: 1.6;
}

/* Footer */
.footer {
  padding: 64px 0 28px;
  background: var(--bg-primary);
  border-top: 1px solid var(--border);
}

.footer-inner {
  text-align: center;
}

.footer-title {
  font-size: 18px;
  font-weight: 500;
  margin-bottom: 18px;
}

.footer-commands {
  display: grid;
  gap: 12px;
  max-width: 820px;
  margin: 0 auto 18px;
}

.footer-links {
  color: var(--text-secondary);
  font-size: 13px;
  margin-bottom: 16px;
}

.footer-links a {
  color: var(--text-secondary);
  border-bottom: 1px solid transparent;
}

.footer-links a:hover {
  color: var(--text-primary);
  border-bottom-color: var(--border);
}

.dot {
  margin: 0 8px;
}

.footer-bottom {
  color: var(--text-secondary);
  font-size: 12px;
  padding-top: 14px;
  border-top: 1px solid var(--border);
}

/* Animations */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.animate-on-scroll.visible {
  opacity: 1;
  transform: translateY(0);
}

.stagger-1 {
  transition-delay: 0.1s;
}

.stagger-2 {
  transition-delay: 0.2s;
}

.stagger-3 {
  transition-delay: 0.3s;
}

.stagger-4 {
  transition-delay: 0.4s;
}

@keyframes pulse-border {
  0%,
  100% {
    border-color: var(--red);
  }
  50% {
    border-color: rgba(250, 77, 86, 0.3);
  }
}

@keyframes scroll-indicator {
  0% {
    transform: scaleY(0);
    transform-origin: top;
  }
  100% {
    transform: scaleY(1);
    transform-origin: top;
  }
}

/* Responsive */
@media (max-width: 768px) {
  .container {
    width: min(var(--container), calc(100% - 32px));
  }

  .brand-subtitle {
    display: none;
  }

  .hero {
    padding: 52px 0 70px;
  }

  .hero-title {
    font-size: 40px;
  }

  .hero-subtitle {
    font-size: 18px;
  }

  .hero-stats {
    grid-template-columns: 1fr;
  }

  .timeline-row {
    grid-template-columns: 1fr;
    gap: 10px;
  }

  .timeline-connector {
    height: 14px;
    width: 1px;
    margin: 0 auto;
  }

  .timeline-connector::after {
    display: none;
  }

  .two-col {
    grid-template-columns: 1fr;
  }

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

  .diff-panels {
    grid-template-columns: 1fr;
  }

  .diff-before {
    border-right: 0;
    border-bottom: 1px solid var(--border);
  }

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

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

  .grid-2x2 {
    grid-template-columns: 1fr;
  }

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

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