:root {
  color-scheme: dark;
  --bg: #09111b;
  --panel: rgba(9, 20, 33, 0.82);
  --panel-strong: rgba(8, 19, 30, 0.96);
  --panel-soft: rgba(13, 27, 42, 0.78);
  --line: rgba(0, 229, 255, 0.18);
  --line-strong: rgba(0, 229, 255, 0.4);
  --accent: #00e5ff;
  --accent-soft: rgba(0, 229, 255, 0.14);
  --accent-hot: #6ff7ff;
  --warn: #ffb100;
  --warn-soft: rgba(255, 177, 0, 0.14);
  --text: #e8f6ff;
  --muted: #8ca6ba;
  --ok: #7ef0bc;
  --danger: #ff7365;
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.45);
  --radius: 24px;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  font-family: "Azeret Mono", monospace;
  background:
    radial-gradient(circle at top right, rgba(0, 229, 255, 0.08), transparent 26%),
    radial-gradient(circle at bottom left, rgba(255, 177, 0, 0.08), transparent 22%),
    linear-gradient(180deg, #08111b 0%, #060b13 100%);
  color: var(--text);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    radial-gradient(circle at 1px 1px, rgba(255, 255, 255, 0.05) 1px, transparent 0),
    linear-gradient(rgba(0, 229, 255, 0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 229, 255, 0.02) 1px, transparent 1px);
  background-size: 18px 18px, 72px 72px, 72px 72px;
  opacity: 0.65;
}

button,
input {
  font: inherit;
}

.app-shell {
  position: relative;
  z-index: 1;
  min-height: 100vh;
  padding: 28px;
}

.brand-block h1,
.preview-stage-header h2 {
  margin: 0;
  font-size: clamp(2rem, 4vw, 3.2rem);
  line-height: 0.95;
  letter-spacing: -0.06em;
}

.subtitle {
  max-width: 62ch;
  margin: 14px 0 0;
  color: var(--muted);
  line-height: 1.6;
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--accent-hot);
  letter-spacing: 0.3em;
  font-size: 0.72rem;
}

.eyebrow.secondary {
  margin-bottom: 10px;
  color: var(--warn);
}

.headline-status {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 10px;
}

.headline-chip,
.validity-badge {
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 999px;
  padding: 12px 16px;
  font-size: 0.82rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  backdrop-filter: blur(10px);
}

.headline-chip.ok,
.validity-badge.ok {
  background: rgba(126, 240, 188, 0.14);
  color: var(--ok);
  box-shadow: 0 0 0 1px rgba(126, 240, 188, 0.16) inset;
}

.headline-chip.warn,
.validity-badge.warn {
  background: var(--warn-soft);
  color: var(--warn);
  box-shadow: 0 0 0 1px rgba(255, 177, 0, 0.2) inset;
}

.headline-chip.neutral {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text);
}

.layout-grid {
  display: grid;
  grid-template-columns: minmax(220px, 280px) auto minmax(0, 1fr);
  gap: 0;
  min-height: calc(100vh - 56px);
  transition: grid-template-columns 300ms ease;
}

.controls-panel,
.preview-panel {
  min-width: 0;
}

.controls-panel {
  position: sticky;
  top: 28px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  height: calc(100vh - 56px);
  overflow: hidden;
  transition: visibility 250ms, opacity 250ms;
}

.panel-section,
.status-panel {
  background: linear-gradient(180deg, rgba(8, 19, 30, 0.96), rgba(7, 14, 24, 0.88));
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.panel-section {
  padding: 8px 10px;
  flex-shrink: 0;
  border-radius: 12px;
}

.hero-section {
  background:
    linear-gradient(135deg, rgba(0, 229, 255, 0.1), transparent 52%),
    linear-gradient(180deg, rgba(8, 19, 30, 0.98), rgba(7, 14, 24, 0.94));
}

.model-select {
  width: 100%;
  padding: 6px 8px;
  margin-bottom: 8px;
  border-radius: 8px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(0, 0, 0, 0.22);
  color: var(--text);
  font-family: "Azeret Mono", monospace;
  font-size: 0.78rem;
  appearance: none;
  cursor: pointer;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpath d='M0 0l5 6 5-6z' fill='%238ca6ba'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 8px center;
}

.model-select:focus {
  outline: 2px solid rgba(0, 229, 255, 0.5);
  outline-offset: 2px;
}

.section-heading {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 4px;
}

.section-heading.compact {
  margin-bottom: 2px;
}

.section-heading h2,
.inline-heading h2 {
  margin: 0;
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.section-heading p,
.inline-heading p {
  margin: 0;
  color: var(--muted);
  font-size: 0.65rem;
  line-height: 1.4;
}

.hero-size {
  display: flex;
  align-items: baseline;
  gap: 4px;
  font-size: clamp(1.1rem, 2.5vw, 1.5rem);
  font-weight: 700;
  letter-spacing: -0.04em;
}

.copy-btn {
  align-self: center;
  appearance: none;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.04);
  color: var(--muted);
  cursor: pointer;
  padding: 4px;
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: color 160ms, border-color 160ms, background 160ms;
}

.copy-btn:hover {
  color: var(--accent);
  border-color: rgba(0, 229, 255, 0.3);
  background: rgba(0, 229, 255, 0.08);
}

.copy-btn.copied {
  color: var(--ok);
  border-color: rgba(126, 240, 188, 0.3);
}

.hero-divider {
  color: var(--accent);
}

.hero-pixels {
  margin-top: 2px;
  font-size: 0.62rem;
  color: var(--muted);
}

.preset-groups {
  display: grid;
  gap: 8px;
  overflow-y: auto;
  padding-right: 4px;
  min-height: 0;
}

.preset-group {
  display: grid;
  gap: 4px;
}

.preset-group-title {
  color: var(--accent-hot);
  font-size: 0.6rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.preset-buttons {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(90px, 1fr));
  gap: 4px;
}

.preset-button,
.toggle-button {
  appearance: none;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(255, 255, 255, 0.03);
  color: var(--text);
  border-radius: 10px;
  padding: 6px 8px;
  text-align: left;
  cursor: pointer;
  transition: border-color 160ms ease, transform 160ms ease, background 160ms ease, box-shadow 160ms ease;
}

.preset-button:hover,
.toggle-button:hover {
  border-color: rgba(0, 229, 255, 0.34);
  transform: translateY(-1px);
}

.resize-handle:hover {
  filter: brightness(1.08);
}

.preset-button.active,
.toggle-button.active {
  background: linear-gradient(180deg, rgba(0, 229, 255, 0.12), rgba(0, 229, 255, 0.03));
  border-color: rgba(0, 229, 255, 0.45);
  box-shadow: 0 0 0 1px rgba(0, 229, 255, 0.25) inset;
}

.preset-label {
  display: block;
  font-size: 0.72rem;
  line-height: 1.3;
}

.preset-meta {
  display: none;
}

.toggle-group {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 4px;
}

.toggle-button {
  text-align: center;
}

.ratio-control.hidden {
  display: none;
}

.ratio-control {
  margin-bottom: 4px;
  padding: 8px 10px;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.05);
}

.control-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 6px;
  margin-bottom: 4px;
  color: var(--muted);
  font-size: 0.65rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.input-grid {
  display: grid;
  gap: 6px;
}

.input-grid.hidden {
  display: none;
}

.input-card {
  padding: 8px 10px;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.05);
}

input[type="number"] {
  width: 100%;
  margin-bottom: 4px;
  padding: 6px 8px;
  border-radius: 8px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(0, 0, 0, 0.22);
  color: var(--text);
  font-size: 0.78rem;
}

input[type="range"] {
  width: 100%;
  accent-color: var(--accent);
  cursor: pointer;
}

input:focus,
button:focus {
  outline: 2px solid rgba(0, 229, 255, 0.5);
  outline-offset: 2px;
}

input[disabled] {
  opacity: 0.45;
  cursor: not-allowed;
}

.range-labels {
  display: flex;
  justify-content: space-between;
  margin-top: 4px;
  color: var(--muted);
  font-size: 0.65rem;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 4px 10px;
  margin: 0;
}

.stats-grid dt {
  margin-bottom: 1px;
  color: var(--muted);
  font-size: 0.58rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.stats-grid dd {
  margin: 0;
  font-size: 0.75rem;
  line-height: 1.3;
}

.preview-panel {
  display: flex;
  min-height: 0;
}

.preview-stage {
  flex: 1;
  position: relative;
  overflow: hidden;
  min-height: 520px;
  border-radius: 24px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.02), rgba(255, 255, 255, 0)),
    linear-gradient(90deg, rgba(0, 229, 255, 0.045) 1px, transparent 1px),
    linear-gradient(rgba(0, 229, 255, 0.045) 1px, transparent 1px),
    radial-gradient(circle at center, rgba(0, 229, 255, 0.08), transparent 60%),
    #07121e;
  background-size: auto, 48px 48px, 48px 48px, auto, auto;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.04);
}

.crosshair {
  position: absolute;
  background: rgba(255, 255, 255, 0.08);
  pointer-events: none;
}

.crosshair-x {
  top: 50%;
  left: 0;
  right: 0;
  height: 1px;
}

.crosshair-y {
  left: 50%;
  top: 0;
  bottom: 0;
  width: 1px;
}

.preview-shape {
  position: absolute;
  --shape-outline: 2px;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  display: block;
  border: 2px solid rgba(0, 229, 255, 0.9);
  background:
    linear-gradient(135deg, rgba(0, 229, 255, 0.18), rgba(0, 229, 255, 0.08)),
    rgba(0, 229, 255, 0.08);
  box-shadow:
    0 0 0 1px rgba(0, 229, 255, 0.24) inset,
    0 0 80px rgba(0, 229, 255, 0.16);
  transition: width 180ms ease, height 180ms ease, box-shadow 180ms ease, opacity 180ms ease;
}

.preview-shape:not(.is-scaled) {
  border-color: rgba(126, 240, 188, 0.92);
  background:
    linear-gradient(135deg, rgba(126, 240, 188, 0.2), rgba(126, 240, 188, 0.08)),
    rgba(126, 240, 188, 0.08);
  box-shadow:
    0 0 0 1px rgba(126, 240, 188, 0.24) inset,
    0 0 80px rgba(126, 240, 188, 0.16);
}

.preview-shape.dragging {
  transition: none;
}

.shape-scale-badge {
  position: absolute;
  left: 50%;
  bottom: 20px;
  transform: translateX(-50%);
  border: 1px solid rgba(255, 177, 0, 0.24);
  border-radius: 12px;
  padding: 8px 10px;
  background: rgba(6, 11, 19, 0.9);
  color: var(--warn);
  box-shadow: none;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  pointer-events: none;
  z-index: 4;
  white-space: nowrap;
}

.shape-scale-badge.hidden {
  display: none;
}

.shape-sheen {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.18), transparent 24%),
    linear-gradient(315deg, rgba(255, 255, 255, 0.08), transparent 18%);
}

.preview-shape.is-scaled {
  box-shadow:
    0 0 0 1px rgba(255, 177, 0, 0.22) inset,
    0 0 90px rgba(255, 177, 0, 0.14);
  border-color: rgba(255, 177, 0, 0.92);
  background:
    linear-gradient(135deg, rgba(255, 177, 0, 0.16), rgba(255, 177, 0, 0.06)),
    rgba(255, 177, 0, 0.06);
}

.dimension-label {
  position: absolute;
  padding: 8px 10px;
  border-radius: 12px;
  background: rgba(6, 11, 19, 0.9);
  border: 1px solid rgba(255, 255, 255, 0.08);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  white-space: nowrap;
}

.dimension-label.horizontal {
  left: 50%;
  top: 20px;
  transform: translateX(-50%);
}

.dimension-label.vertical {
  left: 8px;
  top: 50%;
  transform: translateY(-50%) rotate(-90deg);
  transform-origin: center;
}

.resize-handle {
  position: absolute;
  border: 0;
  background: transparent;
  box-shadow: none;
  padding: 0;
  color: rgba(0, 229, 255, 0.98);
  outline-offset: 4px;
  --handle-thickness: 6px;
}

.resize-handle::before,
.resize-handle::after {
  content: "";
  position: absolute;
  display: block;
  background: currentColor;
  border-radius: 999px;
  box-shadow: 0 0 14px rgba(0, 229, 255, 0.3);
}

.handle-n,
.handle-s {
  width: 56px;
  height: 28px;
}

.handle-n::before,
.handle-s::before {
  left: 6px;
  right: 6px;
  top: 50%;
  height: var(--handle-thickness);
  transform: translateY(-50%);
}

.handle-e,
.handle-w {
  width: 28px;
  height: 56px;
}

.handle-e::before,
.handle-w::before {
  top: 6px;
  bottom: 6px;
  left: 50%;
  width: var(--handle-thickness);
  transform: translateX(-50%);
}

.handle-nw,
.handle-ne,
.handle-sw,
.handle-se {
  width: 34px;
  height: 34px;
}

.handle-nw::before,
.handle-sw::before {
  left: 50%;
  top: 50%;
  bottom: 0;
  width: var(--handle-thickness);
  transform: translateX(-50%);
}

.handle-nw::after,
.handle-ne::after {
  top: 50%;
  left: 50%;
  right: 0;
  height: var(--handle-thickness);
  transform: translateY(-50%);
}

.handle-ne::before,
.handle-se::before {
  left: 50%;
  top: 50%;
  bottom: 0;
  width: var(--handle-thickness);
  transform: translateX(-50%);
}

.handle-sw::after,
.handle-se::after {
  top: 50%;
  left: 50%;
  right: 0;
  height: var(--handle-thickness);
  transform: translateY(-50%);
}

.handle-ne::after,
.handle-se::after {
  left: 0;
  right: 50%;
}

.handle-sw::before,
.handle-se::before {
  top: 0;
  bottom: 50%;
}

.handle-nw,
.handle-ne,
.handle-sw,
.handle-se {
  cursor: nwse-resize;
}

.handle-ne,
.handle-sw {
  cursor: nesw-resize;
}

.handle-n,
.handle-s {
  cursor: ns-resize;
}

.handle-e,
.handle-w {
  cursor: ew-resize;
}

.handle-nw { left: calc(var(--shape-outline) * -0.5); top: calc(var(--shape-outline) * -0.5); transform: translate(-50%, -50%); }
.handle-n { left: 50%; top: calc(var(--shape-outline) * -0.5); transform: translate(-50%, -50%); }
.handle-ne { right: calc(var(--shape-outline) * -0.5); top: calc(var(--shape-outline) * -0.5); transform: translate(50%, -50%); }
.handle-e { right: calc(var(--shape-outline) * -0.5); top: 50%; transform: translate(50%, -50%); }
.handle-se { right: calc(var(--shape-outline) * -0.5); bottom: calc(var(--shape-outline) * -0.5); transform: translate(50%, 50%); }
.handle-s { left: 50%; bottom: calc(var(--shape-outline) * -0.5); transform: translate(-50%, 50%); }
.handle-sw { left: calc(var(--shape-outline) * -0.5); bottom: calc(var(--shape-outline) * -0.5); transform: translate(-50%, 50%); }
.handle-w { left: calc(var(--shape-outline) * -0.5); top: 50%; transform: translate(-50%, -50%); }

.status-panel {
  padding: 20px 22px 22px;
}

.constraint-list {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
  padding: 0;
  margin: 0 0 18px;
}

.constraint-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.05);
}

.constraint-item.ok {
  color: var(--text);
}

.constraint-item.fail {
  border-color: rgba(255, 115, 101, 0.3);
  box-shadow: 0 0 0 1px rgba(255, 115, 101, 0.16) inset;
}

.constraint-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  flex: 0 0 12px;
}

.constraint-item.ok .constraint-dot {
  background: var(--ok);
  box-shadow: 0 0 18px rgba(126, 240, 188, 0.42);
}

.constraint-item.fail .constraint-dot {
  background: var(--danger);
  box-shadow: 0 0 18px rgba(255, 115, 101, 0.36);
}

.constraint-copy {
  display: grid;
  gap: 4px;
}

.constraint-copy strong {
  font-size: 0.86rem;
}

.constraint-copy span {
  color: var(--muted);
  font-size: 0.76rem;
  line-height: 1.5;
}

.meter-track {
  height: 14px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.06);
  overflow: hidden;
}

.meter-fill {
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--accent), var(--warn));
  width: 0;
  transition: width 180ms ease;
}

.meter-labels {
  display: flex;
  justify-content: space-between;
  margin-top: 10px;
  color: var(--muted);
  font-size: 0.72rem;
}

/* Presets section — fills remaining sidebar height */
#presetsSection {
  flex: 1;
  min-height: 0;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

#presetsSection .section-heading {
  flex-shrink: 0;
}

#presetsSection .preset-groups {
  flex: 1;
}

/* Sidebar toggle */
.sidebar-collapse {
  align-self: center;
  z-index: 10;
  width: 24px;
  height: 72px;
  border: 1px solid rgba(0, 229, 255, 0.35);
  border-left: none;
  border-radius: 0 10px 10px 0;
  background: rgba(0, 229, 255, 0.06);
  color: var(--accent);
  cursor: pointer;
  font-size: 1.6rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(8px);
  box-shadow: 0 0 12px rgba(0, 229, 255, 0.12);
  transition: color 160ms, border-color 160ms, background 160ms, box-shadow 160ms, opacity 250ms, visibility 250ms;
  padding: 0;
  flex-shrink: 0;
}

.sidebar-collapse:hover {
  color: var(--accent-hot);
  border-color: rgba(0, 229, 255, 0.6);
  background: rgba(0, 229, 255, 0.14);
  box-shadow: 0 0 20px rgba(0, 229, 255, 0.22);
}

.sidebar-expand {
  position: fixed;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  z-index: 200;
  width: 24px;
  height: 72px;
  border: 1px solid rgba(0, 229, 255, 0.35);
  border-left: none;
  border-radius: 0 10px 10px 0;
  background: rgba(0, 229, 255, 0.06);
  color: var(--accent);
  cursor: pointer;
  font-size: 1.6rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(8px);
  box-shadow: 0 0 12px rgba(0, 229, 255, 0.12);
  transition: opacity 250ms ease, box-shadow 160ms;
  opacity: 0;
  pointer-events: none;
  padding: 0;
}

.sidebar-expand:hover {
  color: var(--accent-hot);
  border-color: rgba(0, 229, 255, 0.6);
  background: rgba(0, 229, 255, 0.14);
  box-shadow: 0 0 20px rgba(0, 229, 255, 0.22);
}

body.sidebar-collapsed .sidebar-expand {
  opacity: 1;
  pointer-events: auto;
}

body.sidebar-collapsed .layout-grid {
  grid-template-columns: 0 0 minmax(0, 1fr);
}

body.sidebar-collapsed .controls-panel {
  visibility: hidden;
  opacity: 0;
  overflow: hidden;
}

body.sidebar-collapsed .sidebar-collapse {
  visibility: hidden;
  opacity: 0;
}

@media (max-width: 1180px) {
  .layout-grid {
    grid-template-columns: 0 0 minmax(0, 1fr);
  }

  .controls-panel {
    visibility: hidden;
    opacity: 0;
    overflow: hidden;
  }

  .sidebar-collapse {
    visibility: hidden;
    opacity: 0;
  }

  .sidebar-expand {
    opacity: 1;
    pointer-events: auto;
  }
}

.mobile-footnote {
  display: none;
}

@media (max-width: 480px) {
  .mobile-footnote {
    display: block;
    margin: 12px 0 0;
    text-align: center;
    font-size: 0.72rem;
    color: var(--muted);
  }
}

@media (max-width: 760px) {
  html,
  body {
    height: 100%;
  }

  .app-shell {
    box-sizing: border-box;
    min-height: 100dvh;
    height: 100dvh;
    padding: 16px;
    overflow: hidden;
  }

  .preview-stage {
    min-height: 420px;
  }

  .preview-shape,
  .resize-handle {
    touch-action: none;
  }

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