:root {
  --accent: #E8002D;
  --bg-0: #0a0b0d;
  --bg-1: #131519;
  --bg-2: #1c1f24;
  --line: #2a2e34;
  --text-0: #f2f3f4;
  --text-1: #9a9fa6;
  --mono: "Barlow Condensed", sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg-0);
  color: var(--text-0);
  font-family: "Barlow", sans-serif;
}

body {
  background-image:
    repeating-linear-gradient(90deg, rgba(255,255,255,0.02) 0px, rgba(255,255,255,0.02) 1px, transparent 1px, transparent 64px);
  min-height: 100vh;
}

.app {
  max-width: 1180px;
  margin: 0 auto;
  padding: 28px 24px 60px;
}

/* Topbar */
.topbar {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 28px;
}

.topbar__mark {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 2.5px solid var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: "Anton", sans-serif;
  font-size: 16px;
  color: var(--accent);
  transition: border-color 0.25s ease, color 0.25s ease;
  flex-shrink: 0;
}

.topbar__title h1 {
  font-family: "Anton", sans-serif;
  font-weight: 400;
  font-size: 28px;
  letter-spacing: 0.5px;
  margin: 2px 0 0;
  color: var(--text-0);
}

.topbar__eyebrow {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--accent);
  transition: color 0.25s ease;
}

/* Layout */
.layout {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 24px;
  align-items: start;
}

@media (max-width: 860px) {
  .layout {
    grid-template-columns: 1fr;
  }
}

/* Control panel */
.panel {
  background: var(--bg-1);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 22px;
  position: sticky;
  top: 24px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.field--toggle {
  flex-direction: row;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.field--toggle .field__label {
  flex: 1;
}

.field__label {
  display: flex;
  align-items: baseline;
  gap: 8px;
  font-family: var(--mono);
  font-weight: 600;
  font-size: 14px;
  letter-spacing: 0.4px;
  color: var(--text-0);
}

.field__index {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--accent);
  transition: color 0.25s ease;
}

.select-wrap {
  position: relative;
}

.select-wrap::after {
  content: "";
  position: absolute;
  right: 16px;
  top: 50%;
  width: 8px;
  height: 8px;
  border-right: 2px solid var(--text-1);
  border-bottom: 2px solid var(--text-1);
  transform: translateY(-70%) rotate(45deg);
  pointer-events: none;
}

select {
  width: 100%;
  appearance: none;
  background: var(--bg-2);
  border: 1px solid var(--line);
  color: var(--text-0);
  font-family: "Barlow", sans-serif;
  font-weight: 600;
  font-size: 15px;
  padding: 12px 40px 12px 14px;
  border-radius: 6px;
  cursor: pointer;
  transition: border-color 0.2s ease;
}

select:hover,
select:focus-visible {
  border-color: var(--accent);
  outline: none;
}

/* Switch */
.switch {
  position: relative;
  display: inline-block;
  width: 44px;
  height: 24px;
  flex-shrink: 0;
}

.switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.switch__track {
  position: absolute;
  inset: 0;
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: 999px;
  cursor: pointer;
  transition: background 0.2s ease;
}

.switch__thumb {
  position: absolute;
  top: 2px;
  left: 2px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--text-1);
  transition: transform 0.2s ease, background 0.2s ease;
}

.switch input:checked + .switch__track {
  background: color-mix(in srgb, var(--accent) 30%, var(--bg-2));
  border-color: var(--accent);
}

.switch input:checked + .switch__track .switch__thumb {
  transform: translateX(20px);
  background: var(--accent);
}

/* Buttons */
.panel__actions {
  padding-top: 4px;
}

.btn {
  width: 100%;
  border: none;
  border-radius: 6px;
  padding: 14px 16px;
  font-family: var(--mono);
  font-weight: 700;
  font-size: 16px;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: filter 0.15s ease, transform 0.05s ease;
}

.btn:active {
  transform: translateY(1px);
}

.btn--primary {
  background: var(--accent);
  color: #0a0b0d;
}

.btn--primary:hover {
  filter: brightness(1.08);
}

.btn__meta {
  font-family: var(--mono);
  font-weight: 500;
  font-size: 12px;
  opacity: 0.65;
}

.panel__note {
  font-size: 12.5px;
  color: var(--text-1);
  line-height: 1.5;
  margin: 0;
}

/* Preview */
.preview {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.preview__frame {
  position: relative;
  width: 100%;
  max-width: 480px;
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 30px 60px -20px rgba(0,0,0,0.6), 0 0 0 1px var(--line);
  background: #000;
}

#canvas {
  width: 100%;
  height: auto;
  display: block;
}

.preview__loading {
  position: absolute;
  inset: 0;
  display: none;
  align-items: center;
  justify-content: center;
  background: rgba(10,11,13,0.6);
  color: var(--text-0);
  font-family: var(--mono);
  font-size: 14px;
  letter-spacing: 1px;
  text-transform: uppercase;
}

.preview__loading.is-visible {
  display: flex;
}

.error-banner {
  display: none;
  margin-top: 16px;
  max-width: 480px;
  padding: 14px 16px;
  border-radius: 8px;
  background: rgba(232, 0, 45, 0.12);
  border: 1px solid rgba(232, 0, 45, 0.4);
  color: #ff8a95;
  font-size: 13px;
  line-height: 1.6;
}

.error-banner code {
  background: rgba(255,255,255,0.08);
  padding: 1px 5px;
  border-radius: 4px;
  font-size: 12px;
}

.error-banner.is-visible {
  display: block;
}

.fatal-error {
  display: none;
  max-width: 720px;
  margin: 24px auto 0;
  padding: 18px 20px;
  border-radius: 8px;
  background: rgba(232, 0, 45, 0.1);
  border: 1px solid rgba(232, 0, 45, 0.5);
  color: #ffb3ba;
  font-size: 14px;
  line-height: 1.6;
}

.fatal-error strong {
  color: #ff8a95;
  display: block;
  margin-bottom: 6px;
  font-size: 15px;
}

.fatal-error code {
  background: rgba(255,255,255,0.08);
  padding: 1px 5px;
  border-radius: 4px;
  font-size: 13px;
}

.fatal-error.is-visible {
  display: block;
}

/* Footer */
.footer {
  margin-top: 40px;
  display: flex;
  justify-content: center;
  gap: 10px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--text-1);
}

.footer__dot {
  color: var(--line);
}

.disclaimer {
  margin: 10px auto 0;
  max-width: 560px;
  text-align: center;
  font-size: 11.5px;
  line-height: 1.5;
  color: var(--text-1);
  opacity: 0.7;
}