:root {
  color-scheme: dark;
  --bg: #0f1117;
  --panel: #181b24;
  --panel-2: #1f2430;
  --ink: #eef0f6;
  --muted: #8b93a8;
  --line: #2d3344;
  --line-strong: #3d455c;
  --accent: #6c9eff;
  --accent-strong: #8ab4ff;
  --success: #5ecf8a;
  --danger: #f07070;
  --warning: #a34b00;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.35);
  --preview-toolbar-height: 50px;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.5;
}

button,
input,
select {
  font: inherit;
}

button,
.file-button {
  min-height: 38px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel-2);
  color: var(--ink);
  padding: 0 14px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  cursor: pointer;
  transition: background 120ms ease, border-color 120ms ease, color 120ms ease;
}

button:hover,
.file-button:hover {
  border-color: var(--line-strong);
  background: #252b3a;
}

button:active,
.file-button:active {
  transform: translateY(1px);
}

.file-button {
  position: relative;
  overflow: hidden;
}

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

.topbar {
  padding: 20px 28px;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, var(--panel) 0%, var(--bg) 100%);
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 22px;
}

.brand {
  min-width: 240px;
}

.brand-top {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-logo {
  width: 42px;
  height: 42px;
  display: block;
}

.topbar h1 {
  margin: 0;
  font-size: 24px;
  line-height: 1.2;
  font-weight: 700;
  letter-spacing: 0;
}

.topbar h1 span {
  color: var(--accent);
}

.topbar p {
  margin: 5px 0 0;
  color: var(--muted);
  font-size: 13px;
  max-width: 620px;
}

.status-line {
  color: var(--success);
}

.topbar-side {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 13px;
}

.topbar-actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  flex-wrap: wrap;
  gap: 10px;
}

.file-button input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

#downloadButton {
  color: #0f1117;
  border-color: var(--accent);
  background: var(--accent);
}

#downloadButton:hover {
  border-color: var(--accent-strong);
  background: var(--accent-strong);
}

.workspace {
  min-height: calc(100vh - 134px);
  max-width: 1600px;
  margin: 0 auto;
  padding: 18px 28px 28px;
  display: grid;
  grid-template-columns: minmax(280px, 340px) minmax(0, 1fr);
  gap: 18px;
}

.controls {
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--panel);
  padding: 16px;
  overflow: auto;
}

.control-section,
.stats {
  padding: 0 0 18px;
  margin: 0 0 18px;
  border-bottom: 1px solid var(--line);
}

.control-section:last-child,
.stats:last-child {
  border-bottom: 0;
}

.input-section {
  display: grid;
  gap: 12px;
}

.input-section h2 {
  margin-bottom: 0;
}

.input-drop-zone {
  position: relative;
  display: grid;
  gap: 4px;
  margin: 0;
  padding: 14px;
  border: 1px dashed var(--line-strong);
  border-radius: 8px;
  background: rgba(15, 17, 23, 0.62);
  color: var(--ink);
  cursor: pointer;
  transition: border-color 120ms ease, background 120ms ease;
}

.input-drop-zone:hover,
.input-drop-zone.is-dragging {
  border-color: var(--accent);
  background: rgba(108, 158, 255, 0.08);
}

.input-drop-zone input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

.input-drop-title {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  color: var(--ink);
  font-size: 14px;
  font-weight: 700;
}

.input-drop-title em {
  color: var(--muted);
  font-size: 11px;
  font-style: normal;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.input-drop-sub,
.input-drop-status {
  color: var(--muted);
  font-size: 12px;
}

.input-drop-status {
  color: var(--accent);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.input-help {
  margin: 0;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.45;
}

.clear-contrast-button {
  width: 100%;
  min-height: 32px;
  font-size: 13px;
}

.section-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.section-heading button {
  min-height: 30px;
  padding: 0 10px;
  font-size: 13px;
}

.control-mode-tabs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4px;
  padding: 3px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel-2);
}

.control-mode-tab {
  min-width: 0;
  min-height: 32px;
  border: 0;
  border-radius: 6px;
  background: transparent;
  padding: 0 10px;
  font-size: 13px;
}

.control-mode-tab:hover {
  border: 0;
  background: rgba(108, 158, 255, 0.1);
}

.control-mode-tab.is-active {
  color: #0f1117;
  background: var(--accent);
}

.control-mode-panel {
  margin-top: 14px;
}

.control-mode-panel[hidden] {
  display: none;
}

.advanced-group {
  padding: 0 0 16px;
  margin: 0 0 16px;
  border-bottom: 1px solid var(--line);
}

.advanced-group:last-child {
  padding-bottom: 0;
  margin-bottom: 0;
  border-bottom: 0;
}

h2 {
  margin: 0 0 12px;
  font-size: 13px;
  line-height: 1.2;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
}

label {
  display: grid;
  gap: 7px;
  margin: 13px 0 0;
  color: var(--muted);
  font-size: 13px;
}

label > span {
  display: flex;
  justify-content: space-between;
  gap: 12px;
}

output {
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}

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

select {
  width: 100%;
  min-height: 36px;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: var(--bg);
  color: var(--ink);
  padding: 0 10px;
}

.color-row {
  grid-template-columns: 1fr 54px;
  align-items: center;
}

.color-row span {
  display: block;
}

input[type="color"] {
  width: 54px;
  height: 34px;
  padding: 2px;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: var(--bg);
  cursor: pointer;
}

input:disabled,
select:disabled {
  cursor: not-allowed;
  opacity: 0.55;
}

.compact-heading {
  align-items: end;
  margin-top: -4px;
}

.compact-heading .color-row {
  flex: 1 1 auto;
  margin-top: 0;
}

.compact-heading button {
  flex: 0 0 auto;
}

.check-row {
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: 10px;
  color: var(--ink);
}

.check-row input {
  width: 18px;
  height: 18px;
  accent-color: var(--accent);
}

.check-row span {
  display: block;
}

.stats dl,
.mini-stats {
  margin: 0;
  display: grid;
  gap: 8px;
}

.stats dl > div,
.mini-stats > div {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: baseline;
  gap: 14px;
}

.stats dt,
.mini-stats dt {
  color: var(--muted);
  font-size: 13px;
}

.stats dd,
.mini-stats dd {
  margin: 0;
  font-size: 13px;
  font-variant-numeric: tabular-nums;
}

.mini-stats dd {
  max-width: 170px;
  overflow: hidden;
  color: var(--ink);
  text-align: right;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.preview-pane {
  min-width: 0;
  min-height: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--panel);
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
}

.preview-topbar {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 12px;
  min-height: 44px;
  padding: 6px 12px;
  border-bottom: 1px solid var(--line);
  background: var(--panel-2);
}

.tabs {
  display: flex;
  align-items: center;
  gap: 8px;
  overflow-x: auto;
  overflow-y: hidden;
  text-transform: none;
  letter-spacing: 0;
}

.tab {
  min-width: 74px;
  min-height: 34px;
  padding: 0 12px;
  font-size: 13px;
}

.tab:active {
  transform: none;
}

.tab.is-active {
  color: #0f1117;
  border-color: var(--accent);
  background: var(--accent);
}

.alpha-tools {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
  flex-wrap: nowrap;
  min-width: 0;
}

.alpha-tool-switch {
  flex: 0 0 auto;
}

.alpha-tool-divider {
  width: 1px;
  height: 24px;
  background: var(--line);
  flex-shrink: 0;
}

.alpha-tool {
  min-width: 72px;
  min-height: 30px;
  border: 0;
  border-radius: 6px;
  background: transparent;
  padding: 0 12px;
  font-size: 13px;
}

.alpha-tool:hover {
  border: 0;
  background: rgba(108, 158, 255, 0.1);
}

.alpha-tool.is-active {
  color: #0f1117;
  background: var(--accent);
}

.alpha-size-control {
  flex: 1 1 140px;
  max-width: 220px;
  margin: 0;
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  font-size: 12px;
  white-space: nowrap;
  min-width: 0;
}

.alpha-size-control span {
  flex: 0 0 auto;
}

.alpha-size-control input {
  flex: 1 1 60px;
  min-width: 60px;
  width: auto;
}

.alpha-command-group {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: auto;
}

.alpha-command {
  min-width: 62px;
  min-height: 30px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--panel);
  padding: 0 10px;
  font-size: 13px;
}

.alpha-command:hover:not(:disabled) {
  border-color: var(--line-strong);
  background: #252b3a;
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.45;
}

.preview-bg-controls {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 760;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  white-space: nowrap;
}

.segmented-control {
  display: inline-flex;
  padding: 3px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel-2);
}

.bg-tab {
  min-width: 72px;
  min-height: 30px;
  border: 0;
  border-radius: 6px;
  background: transparent;
  padding: 0 10px;
  font-size: 13px;
}

.bg-tab:hover {
  border: 0;
  background: rgba(108, 158, 255, 0.1);
}

.bg-tab.is-active {
  color: #0f1117;
  background: var(--accent);
}

#previewBgColorInput {
  width: 42px;
  height: 34px;
}

.split-stage {
  position: relative;
  min-height: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  background: var(--bg);
}

.preview-panel {
  min-width: 0;
  min-height: 0;
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  border-right: 1px solid var(--line);
}

.preview-panel:last-of-type {
  border-right: 0;
}

.panel-title {
  height: var(--preview-toolbar-height);
  min-height: var(--preview-toolbar-height);
  max-height: var(--preview-toolbar-height);
  padding: 0 12px;
  border-bottom: 1px solid var(--line);
  background: var(--panel-2);
  display: flex;
  align-items: center;
  overflow: hidden;
  color: var(--muted);
  font-size: 12px;
  font-weight: 760;
  letter-spacing: 0.08em;
  line-height: 1.2;
  text-transform: uppercase;
  box-sizing: border-box;
}

.source-toolbar {
  justify-content: space-between;
  gap: 12px;
}

.source-toolbar > span {
  flex: 0 0 auto;
}

.source-toolbar .tabs {
  justify-content: flex-end;
}

.output-panel-toolbar {
  height: var(--preview-toolbar-height);
  min-height: var(--preview-toolbar-height);
  max-height: var(--preview-toolbar-height);
  padding: 0 12px;
  border-bottom: 1px solid var(--line);
  background: var(--panel-2);
  display: flex;
  align-items: center;
  overflow: hidden;
  box-sizing: border-box;
}

.output-panel-label {
  color: var(--muted);
  font-size: 12px;
  font-weight: 760;
  letter-spacing: 0.08em;
  line-height: 1.2;
  text-transform: uppercase;
}

.alpha-tools[hidden] {
  display: none;
}

.canvas-stage {
  position: relative;
  min-height: 0;
  overflow: auto;
  padding: 18px;
  overscroll-behavior: contain;
}

.canvas-stage:not(.is-zoomed) {
  display: grid;
  place-items: center;
}

.canvas-stage.is-zoomed {
  display: block;
}

.canvas-frame {
  position: relative;
  width: var(--preview-frame-width, 300px);
  height: var(--preview-frame-height, 150px);
  max-width: 100%;
  box-shadow: var(--shadow);
}

.canvas-stage.is-zoomed .canvas-frame {
  max-width: none;
}

.canvas-stage.is-alpha-editing .canvas-frame {
  cursor: none;
  touch-action: none;
}

.alpha-brush-cursor {
  position: absolute;
  left: 0;
  top: 0;
  width: 0;
  height: 0;
  border: 2px solid #0f766e;
  border-radius: 50%;
  box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.9), 0 0 0 3px rgba(15, 118, 110, 0.22);
  pointer-events: none;
  transform: translate(-50%, -50%);
  z-index: 4;
}

.alpha-brush-cursor.is-eraser {
  border-color: #be2f2f;
  box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.9), 0 0 0 3px rgba(190, 47, 47, 0.22);
}

.alpha-brush-cursor[hidden] {
  display: none;
}

.canvas-frame canvas {
  position: absolute;
  inset: 0;
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
  background: transparent;
  image-rendering: auto;
}

.canvas-frame canvas[hidden] {
  display: none;
}

.source-stage {
  background: #121620;
}

.checkerboard {
  background-color: #22262f;
  background-image:
    linear-gradient(45deg, #2a2e3a 25%, transparent 25%),
    linear-gradient(-45deg, #2a2e3a 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #2a2e3a 75%),
    linear-gradient(-45deg, transparent 75%, #2a2e3a 75%);
  background-position: 0 0, 0 10px, 10px -10px, -10px 0;
  background-size: 20px 20px;
}

.solid-background {
  background: var(--preview-solid-bg, #111827);
  background-image: none;
}

.drop-hint {
  position: absolute;
  inset: 20px;
  border: 2px dashed var(--accent);
  border-radius: 8px;
  color: var(--accent-strong);
  background: rgba(15, 17, 23, 0.78);
  display: grid;
  place-items: center;
  font-size: 18px;
  font-weight: 700;
  pointer-events: none;
}

.drop-hint[hidden] {
  display: none;
}

.is-dragging .drop-hint {
  display: grid;
}

.zoom-hint {
  position: absolute;
  left: 50%;
  bottom: 18px;
  z-index: 5;
  pointer-events: none;
  min-height: 34px;
  padding: 7px 12px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 7px;
  background: rgba(23, 32, 38, 0.9);
  color: #ffffff;
  box-shadow: 0 10px 28px rgba(20, 31, 40, 0.2);
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-size: 13px;
  line-height: 1;
  opacity: 0;
  transform: translate(-50%, 8px);
  transition: opacity 160ms ease, transform 160ms ease;
}

.zoom-hint kbd {
  min-width: 34px;
  padding: 3px 7px;
  border: 1px solid rgba(255, 255, 255, 0.28);
  border-radius: 5px;
  background: rgba(255, 255, 255, 0.12);
  color: #ffffff;
  font: inherit;
  text-align: center;
}

.zoom-hint.is-visible {
  opacity: 1;
  transform: translate(-50%, 0);
}

.zoom-hint[hidden] {
  display: none;
}

.promo {
  border-top: 1px solid var(--line);
  background: linear-gradient(180deg, var(--panel) 0%, var(--bg) 100%);
  padding: 40px 28px 48px;
}

.promo-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 40px;
  align-items: center;
}

.promo-copy {
  max-width: 448px;
}

.promo-banner {
  width: 100%;
  max-width: 320px;
  height: auto;
  border-radius: 12px;
  margin-bottom: 20px;
  display: block;
}

.promo-copy h2 {
  margin: 0 0 8px;
  font-size: 26px;
  font-weight: 700;
  letter-spacing: 0;
}

.promo-copy h2 span {
  color: var(--accent);
}

.promo-copy p {
  margin: 0 0 20px;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.55;
}

.play-badge-link {
  display: inline-block;
  padding: 12px;
  margin: -12px;
  line-height: 0;
}

.play-badge {
  height: 48px;
  width: auto;
  display: block;
}

.phone-stage {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
}

.phone-frame {
  position: relative;
  width: 220px;
  padding: 3px;
  border: 1px solid #2e3038;
  border-radius: 30px;
  background: #141418;
  box-shadow:
    0 24px 48px rgba(0, 0, 0, 0.45),
    inset 0 1px 0 rgba(255, 255, 255, 0.06);
}

.phone-screen {
  position: relative;
  overflow: hidden;
  border-radius: 27px;
  background: #000000;
  aspect-ratio: 9 / 16;
}

.phone-island {
  position: absolute;
  top: 8px;
  left: 50%;
  width: 52px;
  height: 12px;
  border-radius: 999px;
  background: #000000;
  transform: translateX(-50%);
  z-index: 2;
  pointer-events: none;
}

.carousel-slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity 0.5s ease;
  pointer-events: none;
}

.carousel-slide.active {
  opacity: 1;
  pointer-events: auto;
}

.carousel-slide img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.carousel-controls {
  display: flex;
  align-items: center;
  gap: 10px;
}

.carousel-btn {
  width: 32px;
  height: 32px;
  min-height: 32px;
  padding: 0;
  border-radius: 50%;
  font-size: 20px;
  line-height: 1;
}

.carousel-dots {
  display: flex;
  gap: 6px;
}

.carousel-dot {
  width: 7px;
  height: 7px;
  min-width: 0;
  min-height: 7px;
  padding: 0;
  border: 0;
  border-radius: 50%;
  background: var(--line-strong);
}

.carousel-dot.active {
  background: var(--accent);
}

.app-footer {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 28px 24px;
  color: var(--muted);
  font-size: 12px;
  text-align: center;
}

.app-footer a {
  color: var(--muted);
  text-decoration: none;
}

.app-footer a:hover {
  color: var(--ink);
}

.app-footer .sep {
  margin: 0 6px;
  user-select: none;
}

@media (max-width: 900px) {
  .topbar {
    align-items: flex-start;
    flex-direction: column;
  }

  .topbar-side {
    width: 100%;
    align-items: flex-start;
  }

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

  .workspace {
    grid-template-columns: 1fr;
    min-height: 0;
  }

  .controls {
    border-right: 0;
    border-bottom: 1px solid var(--line);
    display: grid;
    grid-template-columns: repeat(2, minmax(220px, 1fr));
    gap: 16px;
  }

  .control-section,
  .stats {
    margin: 0;
    padding: 0 0 12px;
  }

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

  .preview-bg-controls {
    width: 100%;
    flex-wrap: wrap;
  }

  .promo-inner {
    grid-template-columns: 1fr;
    justify-items: center;
    text-align: center;
  }

  .promo-banner {
    margin-left: auto;
    margin-right: auto;
  }
}

@media (min-width: 901px) {
  .workspace {
    height: calc(100vh - 134px);
    overflow: hidden;
  }
}

@media (max-width: 620px) {
  .topbar {
    padding: 13px;
  }

  .topbar-actions {
    width: 100%;
    display: grid;
    grid-template-columns: 1fr 1fr;
  }

  .topbar-actions > * {
    width: 100%;
  }

  .controls {
    grid-template-columns: 1fr;
    padding: 13px;
  }

  .tabs {
    width: 100%;
  }

  .source-toolbar .tabs {
    width: auto;
    flex: 1 1 auto;
  }

  .alpha-tools {
    gap: 8px;
    overflow-x: auto;
    overflow-y: hidden;
  }

  .alpha-tool-divider {
    display: none;
  }

  .alpha-size-control {
    flex: 1 1 120px;
    max-width: none;
  }

  .alpha-command-group {
    flex: 0 0 auto;
    margin-left: auto;
  }

  .tab {
    min-width: 0;
    flex: 1 0 68px;
  }

  .segmented-control {
    flex: 1 1 auto;
  }

  .bg-tab {
    flex: 1 1 72px;
  }

  .split-stage {
    grid-template-columns: 1fr;
  }

  .preview-panel {
    min-height: 420px;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .preview-panel:last-of-type {
    border-bottom: 0;
  }

  .canvas-stage {
    padding: 12px;
  }
}