:root {
  --ink: #151713;
  --muted: #69705f;
  --paper: #f5f1e6;
  --panel: rgba(255, 252, 240, 0.88);
  --line: rgba(33, 38, 28, 0.14);
  --accent: #e5532f;
  --accent-2: #0a7c7f;
  --good: #167a3f;
  --warn: #b86900;
  --bad: #b42318;
  --shadow: 0 24px 70px rgba(32, 28, 18, 0.16);
  --radius: 26px;
}

* {
  box-sizing: border-box;
}

body {
  min-height: 100vh;
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 12% 8%, rgba(229, 83, 47, 0.22), transparent 28rem),
    radial-gradient(circle at 92% 20%, rgba(10, 124, 127, 0.2), transparent 30rem),
    linear-gradient(135deg, #ede3cc 0%, var(--paper) 42%, #dce4d1 100%);
  font-family: Georgia, "Times New Roman", serif;
}

button {
  appearance: none;
  border: 0;
  border-radius: 999px;
  padding: 0.8rem 1.05rem;
  color: #fff;
  background: var(--ink);
  font: 700 0.95rem/1.1 "Trebuchet MS", Verdana, sans-serif;
  cursor: pointer;
  transition: transform 150ms ease, background 150ms ease, opacity 150ms ease;
}

button:hover {
  transform: translateY(-1px);
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.45;
  transform: none;
}

button.secondary {
  color: var(--ink);
  background: rgba(21, 23, 19, 0.09);
}

button.accent {
  background: var(--accent);
}

.app-shell {
  width: min(1500px, calc(100% - 32px));
  margin: 0 auto;
  padding: 28px 0 44px;
}

.panel {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  box-shadow: var(--shadow);
  backdrop-filter: blur(14px);
}

.hero {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 24px;
  align-items: end;
  padding: clamp(24px, 5vw, 54px);
  overflow: hidden;
  position: relative;
}

.hero::after {
  content: "";
  position: absolute;
  inset: auto -6% -60px 42%;
  height: 180px;
  background: repeating-linear-gradient(105deg, rgba(21, 23, 19, 0.08) 0 12px, transparent 12px 34px);
  transform: rotate(-2deg);
  pointer-events: none;
}

.eyebrow {
  margin: 0 0 0.45rem;
  color: var(--accent-2);
  font: 800 0.76rem/1 "Trebuchet MS", Verdana, sans-serif;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

h1, h2 {
  margin: 0;
  letter-spacing: -0.05em;
}

h1 {
  max-width: 900px;
  font-size: clamp(2.25rem, 7vw, 6.8rem);
  line-height: 0.88;
}

h2 {
  font-size: clamp(1.35rem, 2.2vw, 2.1rem);
}

.lede {
  max-width: 760px;
  margin: 1.2rem 0 0;
  color: var(--muted);
  font: 1.08rem/1.55 "Trebuchet MS", Verdana, sans-serif;
}

.hero-status {
  min-width: 220px;
  border-radius: 20px;
  padding: 1rem;
  color: #fff;
  background: var(--ink);
  font: 800 1rem/1.25 "Trebuchet MS", Verdana, sans-serif;
  text-align: center;
  z-index: 1;
}

.quick-start,
.controls-grid {
  display: grid;
  gap: 18px;
  margin-top: 18px;
}

.quick-start {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  padding: 22px;
}

.quick-start article {
  position: relative;
  border-radius: 20px;
  padding: 18px;
  background: rgba(255, 255, 255, 0.38);
}

.quick-start h2 {
  margin-left: 3rem;
}

.step-number {
  position: absolute;
  top: 16px;
  left: 16px;
  display: grid;
  place-items: center;
  width: 2.25rem;
  height: 2.25rem;
  border-radius: 50%;
  color: #fff;
  background: var(--accent);
  font: 900 1.05rem/1 "Trebuchet MS", Verdana, sans-serif;
}

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

.toggle-row {
  display: flex;
  gap: 10px;
  align-items: center;
  grid-column: 1 / -1;
  color: var(--muted);
  font: 800 0.95rem/1.3 "Trebuchet MS", Verdana, sans-serif;
}

.toggle-row input {
  width: 1.2rem;
  height: 1.2rem;
  accent-color: var(--accent);
}

.source-card {
  padding: 18px;
}

.card-head {
  display: flex;
  gap: 16px;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

.preview-shell {
  position: relative;
  min-height: 260px;
  border-radius: 20px;
  overflow: hidden;
  background: #050505;
  user-select: none;
}

.preview-shell video {
  display: block;
  width: 100%;
  height: auto;
  min-height: 260px;
  background: #050505;
}

.preview-shell.has-video .empty-state {
  display: none;
}

.empty-state {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 2rem;
  color: rgba(255, 255, 255, 0.72);
  font: 700 1rem/1.45 "Trebuchet MS", Verdana, sans-serif;
  text-align: center;
}

.crop-box {
  position: absolute;
  left: 6%;
  top: 6%;
  width: 16%;
  height: 8%;
  min-width: 58px;
  min-height: 34px;
  border: 2px solid #f4d44d;
  border-radius: 10px;
  background: rgba(244, 212, 77, 0.12);
  box-shadow: 0 0 0 9999px rgba(0, 0, 0, 0.12), 0 0 24px rgba(244, 212, 77, 0.45);
  cursor: move;
  touch-action: none;
  z-index: 3;
}

.crop-label {
  position: absolute;
  left: 8px;
  top: -28px;
  border-radius: 999px;
  padding: 4px 8px;
  color: #211d09;
  background: #f4d44d;
  font: 800 0.72rem/1 "Trebuchet MS", Verdana, sans-serif;
  white-space: nowrap;
}

.resize-handle {
  position: absolute;
  right: -7px;
  bottom: -7px;
  width: 18px;
  height: 18px;
  border: 2px solid #211d09;
  border-radius: 50%;
  background: #f4d44d;
  cursor: nwse-resize;
}

.source-readout {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 7px 12px;
  margin-top: 14px;
  font: 0.92rem/1.25 "Trebuchet MS", Verdana, sans-serif;
}

.source-readout span {
  color: var(--muted);
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.source-readout strong {
  overflow-wrap: anywhere;
}

.sync-panel {
  margin-top: 18px;
  padding: 22px;
}

.sync-summary {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.offset-value,
.delay-value {
  font: 900 clamp(2.4rem, 7vw, 5.8rem)/0.9 "Trebuchet MS", Verdana, sans-serif;
  letter-spacing: -0.08em;
}

.delay-value {
  color: var(--accent);
}

.hint {
  margin: 0.75rem 0 0;
  color: var(--muted);
  font: 0.98rem/1.45 "Trebuchet MS", Verdana, sans-serif;
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

.button-row.inline {
  margin-top: 0;
  justify-content: flex-end;
}

.button-row.inline.left {
  justify-content: flex-start;
  margin-top: 14px;
}

.button-row.compact button {
  padding-inline: 1.2rem;
}

.radio-direct {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 18px;
  align-items: center;
  margin-top: 18px;
  border: 1px solid rgba(10, 124, 127, 0.22);
  border-radius: 20px;
  padding: 16px;
  background: rgba(10, 124, 127, 0.08);
}

.radio-direct strong {
  display: block;
  font: 900 1.3rem/1.1 "Trebuchet MS", Verdana, sans-serif;
}

.advanced {
  margin-top: 18px;
  font: 0.95rem/1.4 "Trebuchet MS", Verdana, sans-serif;
}

.advanced summary {
  cursor: pointer;
  font-weight: 800;
}

.advanced-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 14px;
}

.advanced-card {
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 14px;
  background: rgba(255, 255, 255, 0.36);
}

.advanced-card h3 {
  margin: 0 0 12px;
  font: 900 1.05rem/1.2 "Trebuchet MS", Verdana, sans-serif;
}

.diagnostics-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 320px)) 1fr;
  gap: 12px;
  align-items: start;
  margin-top: 12px;
}

.diagnostics-grid canvas {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #111;
}

pre {
  min-height: 120px;
  max-height: 260px;
  margin: 0;
  overflow: auto;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 12px;
  background: rgba(255, 255, 255, 0.56);
  white-space: pre-wrap;
}

.instructions {
  margin-top: 18px;
  padding: 22px;
}

.instructions ol {
  margin: 1rem 0 0;
  padding-left: 1.4rem;
  color: var(--muted);
  font: 1rem/1.6 "Trebuchet MS", Verdana, sans-serif;
}

code {
  border-radius: 6px;
  padding: 0.1rem 0.3rem;
  background: rgba(21, 23, 19, 0.08);
}

.status-good {
  color: var(--good);
}

.status-warn {
  color: var(--warn);
}

.status-bad {
  color: var(--bad);
}

.source-pill {
  border-radius: 999px;
  padding: 0.45rem 0.7rem;
  color: var(--muted);
  background: rgba(21, 23, 19, 0.08);
  font: 800 0.82rem/1.1 "Trebuchet MS", Verdana, sans-serif;
}

.simple-readout {
  grid-template-columns: auto 1fr;
}

.primary-actions {
  align-items: center;
}

@media (max-width: 1000px) {
  .hero,
  .quick-start,
  .controls-grid,
  .sync-summary,
  .radio-direct,
  .advanced-grid,
  .diagnostics-grid {
    grid-template-columns: 1fr;
  }

  .button-row.inline {
    justify-content: flex-start;
  }

  .hero-status {
    width: 100%;
  }

  .card-head {
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (max-width: 620px) {
  .app-shell {
    width: min(100% - 18px, 1500px);
    padding-top: 9px;
  }

  .hero,
  .quick-start,
  .source-card,
  .sync-panel,
  .instructions {
    padding: 16px;
    border-radius: 20px;
  }

  button {
    width: 100%;
  }

  .button-row.compact {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
  }

  .button-row.compact button {
    width: auto;
  }
}