:root {
  --ink: #111827;
  --ink-soft: #253044;
  --muted: #667085;
  --line: #d9e2ee;
  --paper: #f6f8fb;
  --panel: #ffffff;
  --blue: #0061d2;
  --navy: #000026;
  --teal: #2f9ab3;
  --gold: #c89335;
  --radius: 8px;
  --shadow: 0 18px 46px rgba(17, 24, 39, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.5;
  overflow-x: hidden;
}

button,
input,
textarea,
select {
  font: inherit;
}

.app-shell {
  min-height: 100vh;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid rgba(217, 226, 238, 0.86);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(14px);
}

.topbar-inner {
  width: min(1220px, calc(100% - 32px));
  margin: 0 auto;
  padding: 13px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.brand {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.brand strong {
  font-size: 0.98rem;
  letter-spacing: 0;
}

.brand span {
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 720;
}

.topbar-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.button {
  min-height: 38px;
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #ffffff;
  color: var(--ink);
  cursor: pointer;
  font-size: 0.88rem;
  font-weight: 800;
}

.button.primary {
  border-color: var(--gold);
  background: var(--gold);
  color: #17130a;
}

.button:hover {
  box-shadow: 0 10px 24px rgba(17, 24, 39, 0.10);
}

.preview-hero {
  position: relative;
  min-height: clamp(540px, 64vh, 760px);
  display: grid;
  align-items: end;
  overflow: hidden;
  color: #ffffff;
  background: linear-gradient(90deg, var(--blue) 0%, var(--navy) 100%);
  isolation: isolate;
}

.signal-field-host {
  position: absolute;
  inset: -9% -4% -13%;
  z-index: 0;
  overflow: hidden;
}

.signal-field-canvas {
  width: 100%;
  height: 100%;
  display: block;
}

.preview-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background:
    linear-gradient(90deg, rgba(0, 0, 38, 0.68) 0%, rgba(0, 0, 38, 0.44) 38%, rgba(0, 0, 38, 0.12) 70%, rgba(0, 0, 38, 0.02) 100%),
    linear-gradient(180deg, rgba(0, 0, 38, 0.06) 0%, rgba(0, 0, 38, 0.34) 100%);
}

.preview-copy {
  position: relative;
  z-index: 2;
  width: min(1220px, calc(100% - 32px));
  margin: 0 auto;
  padding: 86px 0 54px;
  max-width: 940px;
  justify-self: center;
}

.eyebrow {
  margin: 0 0 12px;
  color: rgba(255, 255, 255, 0.82);
  font-size: 0.78rem;
  font-weight: 850;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  color: #ffffff;
  font-size: clamp(3rem, 7vw, 5.1rem);
  line-height: 1;
  letter-spacing: 0;
}

.preview-copy p:not(.eyebrow) {
  max-width: 760px;
  margin: 22px 0 0;
  color: rgba(255, 255, 255, 0.86);
  font-size: clamp(1.05rem, 2.2vw, 1.26rem);
}

.preview-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 24px;
}

.preview-tags span {
  min-height: 28px;
  display: inline-flex;
  align-items: center;
  padding: 5px 10px;
  border: 1px solid rgba(255, 255, 255, 0.20);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.10);
  color: #ffffff;
  font-size: 0.78rem;
  font-weight: 800;
}

.workspace {
  width: min(1220px, calc(100% - 32px));
  margin: 0 auto;
  padding: 34px 0 48px;
  display: grid;
  grid-template-columns: minmax(0, 0.94fr) minmax(360px, 0.66fr);
  gap: 22px;
  align-items: start;
}

.panel {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  box-shadow: 0 10px 28px rgba(17, 24, 39, 0.06);
}

.panel-header {
  padding: 18px 20px 14px;
  border-bottom: 1px solid var(--line);
}

.panel-header h2 {
  margin: 0;
  font-size: 1.18rem;
  line-height: 1.2;
  letter-spacing: 0;
}

.panel-header p {
  margin: 7px 0 0;
  color: var(--muted);
  font-size: 0.93rem;
}

.controls-grid {
  padding: 18px 20px 20px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.field {
  display: grid;
  gap: 7px;
}

.field.full {
  grid-column: 1 / -1;
}

label {
  color: var(--ink-soft);
  font-size: 0.82rem;
  font-weight: 850;
}

input,
textarea {
  width: 100%;
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #ffffff;
  color: var(--ink);
}

input[type="number"],
input[type="text"] {
  min-height: 38px;
  padding: 8px 10px;
}

input[type="color"] {
  height: 38px;
  padding: 3px;
}

input[type="range"] {
  accent-color: var(--blue);
}

textarea {
  min-height: 210px;
  padding: 12px;
  resize: vertical;
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
  font-size: 0.82rem;
  line-height: 1.45;
}

.range-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 56px;
  gap: 10px;
  align-items: center;
}

.range-value {
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 850;
  text-align: right;
}

.preview-config {
  padding: 18px 20px 20px;
}

.output-box {
  min-height: 260px;
}

.status-line {
  min-height: 22px;
  margin-top: 10px;
  color: var(--teal);
  font-size: 0.86rem;
  font-weight: 800;
}

.repo-note {
  width: min(1220px, calc(100% - 32px));
  margin: 0 auto 42px;
  padding: 16px 18px;
  border-left: 4px solid var(--gold);
  background: #fff8ec;
  color: #49381d;
  font-size: 0.92rem;
}

footer {
  border-top: 1px solid var(--line);
  background: #ffffff;
}

.footer-inner {
  width: min(1220px, calc(100% - 32px));
  margin: 0 auto;
  padding: 24px 0;
  color: var(--muted);
  font-size: 0.9rem;
}

@media (max-width: 940px) {
  .workspace {
    grid-template-columns: 1fr;
  }

  .signal-field-host {
    inset: -6% -18% -10%;
  }
}

@media (max-width: 640px) {
  .topbar-inner {
    align-items: flex-start;
    flex-direction: column;
  }

  .topbar-actions {
    justify-content: flex-start;
  }

  .preview-hero {
    min-height: 620px;
  }

  .signal-field-host {
    inset: -3% -52% -8% -22%;
  }

  .preview-hero::after {
    background:
      linear-gradient(90deg, rgba(0, 0, 38, 0.72) 0%, rgba(0, 0, 38, 0.56) 58%, rgba(0, 0, 38, 0.20) 100%),
      linear-gradient(180deg, rgba(0, 0, 38, 0.08) 0%, rgba(0, 0, 38, 0.38) 100%);
  }

  .preview-copy {
    padding: 74px 0 44px;
  }

  h1 {
    font-size: clamp(2.45rem, 10vw, 3rem);
  }

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

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}