:root {
  color-scheme: light dark;
  --bg: #f7f8f4;
  --surface: #ffffff;
  --surface-soft: #f0f4f3;
  --ink: #111816;
  --muted: #5d6965;
  --line: #dce4df;
  --line-strong: #c5d2cb;
  --teal: #13a58f;
  --blue: #3578e5;
  --amber: #d57926;
  --shadow: 0 24px 60px rgba(18, 34, 30, 0.13);
  --max: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background:
    linear-gradient(90deg, rgba(19, 165, 143, 0.08), transparent 32%),
    linear-gradient(180deg, #ffffff 0%, var(--bg) 70%);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

a {
  color: inherit;
  text-decoration: none;
}

.site-header {
  width: min(var(--max), calc(100% - 40px));
  height: 72px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand,
.nav-links,
.language-switch,
.hero-actions,
.signal-strip {
  display: flex;
  align-items: center;
}

.brand {
  gap: 10px;
  font-size: 19px;
  font-weight: 800;
}

.brand img {
  border-radius: 7px;
}

.nav-links {
  gap: 24px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 650;
}

.nav-links a:hover,
.steps-grid a:hover {
  color: var(--ink);
}

.language-switch {
  gap: 4px;
  padding: 4px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.76);
}

.language-switch button {
  appearance: none;
  border: 0;
  border-radius: 6px;
  padding: 7px 10px;
  background: transparent;
  color: var(--muted);
  font: inherit;
  font-size: 13px;
  font-weight: 800;
  cursor: pointer;
}

.language-switch button[aria-pressed="true"] {
  color: var(--ink);
  background: var(--surface);
  box-shadow: 0 1px 8px rgba(15, 23, 20, 0.08);
}

.hero {
  width: min(var(--max), calc(100% - 40px));
  min-height: calc(100vh - 72px);
  margin: 0 auto;
  padding: 54px 0 86px;
  display: grid;
  grid-template-columns: minmax(0, 0.82fr) minmax(520px, 1.18fr);
  gap: 52px;
  align-items: center;
}

.eyebrow {
  margin: 0 0 18px;
  color: var(--teal);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 18px;
  font-size: clamp(64px, 10vw, 132px);
  line-height: 0.86;
  letter-spacing: 0;
}

.hero-text {
  max-width: 590px;
  color: var(--muted);
  font-size: 20px;
  line-height: 1.65;
}

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

.button {
  min-height: 46px;
  padding: 12px 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  font-weight: 800;
}

.button.primary {
  color: #fff;
  background: #111816;
  border-color: #111816;
}

.button.secondary {
  background: #fff;
}

.workbench {
  position: relative;
  min-height: 470px;
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background:
    linear-gradient(135deg, rgba(19, 165, 143, 0.16), rgba(53, 120, 229, 0.18)),
    var(--surface);
  box-shadow: var(--shadow);
}

.preview-tabs {
  width: fit-content;
  display: flex;
  gap: 4px;
  padding: 4px;
  margin-bottom: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.8);
}

.preview-tabs button {
  appearance: none;
  border: 0;
  border-radius: 6px;
  padding: 9px 14px;
  background: transparent;
  color: var(--muted);
  font: inherit;
  font-weight: 800;
  cursor: pointer;
}

.preview-tabs button[aria-selected="true"] {
  color: var(--ink);
  background: #fff;
  box-shadow: 0 1px 8px rgba(15, 23, 20, 0.08);
}

.preview-panel {
  min-height: 352px;
}

.terminal-window,
.ui-window,
.rules-window {
  height: 352px;
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.92);
}

.terminal-window {
  padding: 26px;
  color: #1d2a26;
  font: 15px/1.8 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

.terminal-window span {
  color: var(--teal);
  font-weight: 800;
}

.terminal-window .muted {
  color: var(--muted);
}

.terminal-window .ok {
  color: #0d796a;
}

.ui-window {
  padding: 22px;
  display: grid;
  gap: 14px;
  align-content: start;
}

.traffic-list,
.detail-card {
  display: grid;
  grid-template-columns: 18px 56px 1fr 44px;
  align-items: center;
  gap: 10px;
  min-height: 58px;
  padding: 0 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.detail-card {
  grid-template-columns: 1fr;
  min-height: 132px;
  color: var(--muted);
  font-weight: 750;
}

.status {
  width: 10px;
  height: 10px;
  border-radius: 999px;
}

.ok-dot {
  background: var(--teal);
}

.warn-dot {
  background: var(--amber);
}

.traffic-list em {
  font-style: normal;
  font-weight: 800;
}

.rules-window {
  padding: 26px;
  white-space: pre-wrap;
  color: #dff7f1;
  background: #101816;
  font: 15px/1.9 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

.signal-strip,
.workflow-section,
.start-section {
  width: min(var(--max), calc(100% - 40px));
  margin: 0 auto;
}

.signal-strip {
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  padding: 0 0 82px;
}

.signal-strip span {
  padding: 10px 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  color: var(--muted);
  font-weight: 800;
}

.workflow-section,
.start-section {
  padding: 74px 0;
  border-top: 1px solid var(--line);
}

.section-heading {
  max-width: 690px;
  margin-bottom: 30px;
}

h2 {
  font-size: clamp(34px, 5vw, 58px);
  line-height: 1.04;
  letter-spacing: 0;
}

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

.workflow-grid article,
.steps-grid a {
  min-height: 190px;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.workflow-grid h3 {
  font-size: 20px;
  margin-bottom: 12px;
}

.workflow-grid p {
  color: var(--muted);
  line-height: 1.6;
}

.steps-grid a {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  font-weight: 800;
}

.steps-grid strong {
  color: var(--blue);
  font-size: 34px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1211;
    --surface: #151d1a;
    --surface-soft: #111916;
    --ink: #edf5f1;
    --muted: #9eb0aa;
    --line: #26342f;
    --line-strong: #3a4d45;
    --teal: #37d7bd;
    --blue: #7fb1ff;
    --amber: #f2a35a;
    --shadow: 0 24px 70px rgba(0, 0, 0, 0.35);
  }

  body {
    background:
      linear-gradient(90deg, rgba(55, 215, 189, 0.12), transparent 34%),
      linear-gradient(180deg, #101614 0%, var(--bg) 72%);
  }

  .button.primary {
    color: #07110e;
    background: #dff7f1;
    border-color: #dff7f1;
  }

  .button.secondary,
  .language-switch,
  .preview-tabs,
  .signal-strip span,
  .workflow-grid article,
  .steps-grid a,
  .traffic-list,
  .detail-card {
    background: var(--surface);
  }

  .workbench {
    background:
      linear-gradient(135deg, rgba(55, 215, 189, 0.13), rgba(127, 177, 255, 0.14)),
      var(--surface-soft);
  }

  .terminal-window,
  .ui-window {
    color: var(--ink);
    background: rgba(13, 18, 17, 0.86);
  }

  .terminal-window .ok {
    color: var(--teal);
  }

  .preview-tabs button[aria-selected="true"],
  .language-switch button[aria-pressed="true"] {
    background: #21302b;
  }
}

@media (max-width: 920px) {
  .site-header {
    height: auto;
    padding: 18px 0;
    align-items: flex-start;
    flex-wrap: wrap;
  }

  .nav-links {
    justify-content: flex-end;
    flex-wrap: wrap;
    gap: 12px 18px;
  }

  .hero {
    min-height: auto;
    padding-top: 40px;
    grid-template-columns: 1fr;
  }

  .workbench {
    min-height: auto;
    padding: 18px;
  }

  .preview-panel,
  .terminal-window,
  .ui-window,
  .rules-window {
    min-height: 300px;
    height: auto;
  }

  .workflow-grid,
  .steps-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 560px) {
  .site-header,
  .hero,
  .signal-strip,
  .workflow-section,
  .start-section {
    width: min(100% - 28px, var(--max));
  }

  .brand img {
    width: 28px;
    height: 28px;
  }

  .nav-links {
    font-size: 13px;
  }

  .hero {
    gap: 34px;
    padding-bottom: 58px;
  }

  .hero-text {
    font-size: 17px;
  }

  .preview-tabs {
    width: 100%;
  }

  .preview-tabs button {
    flex: 1;
    padding-inline: 8px;
  }

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

  .workflow-section,
  .start-section {
    padding: 52px 0;
  }
}