:root {
  color-scheme: dark;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", Arial, sans-serif;
  font-synthesis: none;
  --bg: #0a0a0b;
  --surface: #151517;
  --surface-raised: #1d1d20;
  --border: rgba(255, 255, 255, 0.1);
  --border-strong: rgba(255, 255, 255, 0.18);
  --text: #f5f5f3;
  --muted: #98989f;
  --accent: #ff6746;
  --accent-pressed: #e95435;
  background: var(--bg);
  color: var(--text);
}

* { box-sizing: border-box; }

html,
body {
  min-height: 100%;
  margin: 0;
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

body { min-height: 100dvh; }
button, input { font: inherit; }
button { color: inherit; -webkit-tap-highlight-color: transparent; }

.app-shell {
  width: 100%;
  min-height: 100dvh;
  margin: 0;
  padding: 0;
}

p { margin: 0; }
.action-row { display: flex; align-items: center; }

button {
  min-height: 44px;
  padding: 0 15px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface-raised);
  font-size: 13px;
  font-weight: 620;
  cursor: pointer;
  transition: transform 120ms ease, background 120ms ease, border-color 120ms ease;
}

button:active:not(:disabled) { transform: scale(0.975); }
button:disabled { cursor: default; opacity: 0.34; }
button:focus-visible,
input:focus-visible {
  outline: 3px solid rgba(255, 103, 70, 0.72);
  outline-offset: 2px;
}
button.primary {
  border-color: var(--accent);
  background: var(--accent);
  color: #fff;
}
button.primary:active:not(:disabled) { background: var(--accent-pressed); }

.viewport {
  position: relative;
  isolation: isolate;
  width: 100%;
  height: 100dvh;
  min-height: 100dvh;
  overflow: hidden;
  border: 0;
  border-radius: 0;
  background: #202023;
  user-select: none;
  -webkit-user-select: none;
}

.viewport::after {
  position: absolute;
  inset: 0;
  z-index: 0;
  border-radius: inherit;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.025);
  content: "";
  pointer-events: none;
}

.viewport video {
  position: absolute;
  inset: 0;
  z-index: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.reference {
  position: absolute;
  left: 50%;
  top: 50%;
  z-index: 1;
  max-width: 96%;
  max-height: 92%;
  mix-blend-mode: multiply;
  transform-origin: center;
  pointer-events: none;
  -webkit-user-drag: none;
  will-change: transform, opacity;
}

.gesture-surface {
  position: absolute;
  inset: 0;
  z-index: 2;
  cursor: grab;
  touch-action: none;
  -webkit-user-select: none;
  user-select: none;
}
.gesture-surface:active { cursor: grabbing; }

.empty-state,
.camera-prompt {
  position: absolute;
  left: 50%;
  z-index: 1;
  width: min(82%, 310px);
  text-align: center;
  transform: translate(-50%, -50%);
}

.empty-state { top: 35%; color: var(--muted); }
.empty-state strong {
  display: block;
  margin-bottom: 6px;
  color: #e7e7e4;
  font-size: 15px;
  font-weight: 650;
}
.empty-state p { font-size: 12px; line-height: 1.45; }

.empty-mark {
  display: grid;
  width: 48px;
  height: 48px;
  margin: 0 auto 14px;
  place-items: center;
  border: 1px solid var(--border-strong);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.04);
  color: var(--accent);
  font-size: 22px;
  font-weight: 300;
}

.camera-prompt {
  top: 57%;
  bottom: auto;
  z-index: 4;
  transform: translate(-50%, -50%);
}
.camera-prompt.with-reference { top: clamp(110px, 25%, 190px); }
.camera-prompt strong {
  display: block;
  margin-bottom: 5px;
  color: var(--text);
  font-size: 14px;
}
.camera-prompt > p:not(.error) {
  margin: 0 auto 12px;
  color: #c2c2c7;
  font-size: 12px;
  line-height: 1.45;
}
.camera-prompt .error {
  margin-top: 10px;
  padding: 9px 11px;
  border: 1px solid rgba(255, 103, 70, 0.26);
  border-radius: 10px;
  background: rgba(58, 21, 18, 0.9);
  color: #ffb4a4;
  font-size: 12px;
  line-height: 1.35;
}

.view-hint {
  position: absolute;
  left: 50%;
  top: max(12px, env(safe-area-inset-top));
  bottom: auto;
  z-index: 3;
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 7px 10px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 9px;
  background: rgba(10, 10, 11, 0.78);
  color: #dedede;
  font-size: 10px;
  font-weight: 560;
  white-space: nowrap;
  transform: translateX(-50%);
  pointer-events: none;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}
.view-hint span {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--accent);
}
.view-hint.locked span { background: #75d69c; }

.control-dock {
  position: absolute;
  left: 50%;
  right: auto;
  bottom: max(10px, env(safe-area-inset-bottom));
  z-index: 5;
  width: calc(100% - 20px);
  max-width: 620px;
  padding: 10px;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: rgba(18, 18, 20, 0.88);
  transform: translateX(-50%);
  box-shadow: 0 12px 38px rgba(0, 0, 0, 0.35);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  max-height: calc(100dvh - max(72px, env(safe-area-inset-top)) - max(20px, env(safe-area-inset-bottom)));
  overflow-y: auto;
  overscroll-behavior: contain;
}

.action-row { gap: 6px; }
.action-row button { flex: 1; padding-inline: 9px; }
.action-row .primary { flex: 1.25; }
.control-dock button { min-height: 44px; border-radius: 10px; }

.setup-guide-trigger {
  position: absolute;
  top: max(10px, env(safe-area-inset-top));
  right: max(10px, env(safe-area-inset-right));
  z-index: 6;
  min-height: 44px;
  padding-inline: 13px;
  border-color: rgba(255, 255, 255, 0.13);
  background: rgba(10, 10, 11, 0.72);
  color: #d3d3d6;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.context-hint {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 44px;
  align-items: center;
  gap: 6px;
  margin-top: 8px;
  padding: 7px 2px 7px 10px;
  border: 1px solid rgba(255, 103, 70, 0.24);
  border-radius: 11px;
  background: rgba(54, 30, 25, 0.8);
  color: #d7d7da;
}
.context-hint p {
  font-size: 11px;
  line-height: 1.4;
}
.context-hint strong { color: #fff; }
.context-hint button {
  min-width: 44px;
  padding: 0;
  border: 0;
  background: transparent;
  color: #c5c5ca;
  font-size: 22px;
}

.import-error,
.intro-error {
  margin-top: 8px;
  padding: 9px 11px;
  border: 1px solid rgba(255, 103, 70, 0.26);
  border-radius: 10px;
  background: rgba(58, 21, 18, 0.9);
  color: #ffb4a4;
  font-size: 12px;
  line-height: 1.4;
}

.lock-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 10px;
  margin-top: 8px;
  padding-top: 8px;
  border-top: 1px solid var(--border);
}
.lock-copy { min-width: 0; }
.lock-copy strong,
.lock-copy span { display: block; }
.lock-copy strong {
  margin-bottom: 2px;
  color: #e7e7e4;
  font-size: 11px;
  font-weight: 650;
}
.lock-copy span {
  color: var(--muted);
  font-size: 10px;
  line-height: 1.3;
}
.lock-row.is-locked .lock-copy strong { color: #9be2b7; }
.lock-button {
  min-width: 94px;
  padding-inline: 11px;
}

.sliders {
  display: grid;
  gap: 3px;
  margin-top: 8px;
  padding-top: 7px;
  border-top: 1px solid var(--border);
}
.sliders label {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr) 36px;
  align-items: center;
  gap: 7px;
  min-height: 44px;
  color: #cfcfd3;
  font-size: 10px;
  font-weight: 560;
}
output {
  text-align: right;
  color: var(--muted);
  font-size: 10px;
  font-variant-numeric: tabular-nums;
}

input[type="range"] {
  width: 100%;
  height: 44px;
  margin: 0;
  appearance: none;
  -webkit-appearance: none;
  background: transparent;
}
input[type="range"]:disabled { opacity: 0.34; }
input[type="range"]::-webkit-slider-runnable-track {
  height: 4px;
  border-radius: 999px;
  background: #36363a;
}
input[type="range"]::-webkit-slider-thumb {
  width: 20px;
  height: 20px;
  margin-top: -8px;
  appearance: none;
  -webkit-appearance: none;
  border: 0;
  border-radius: 50%;
  background: #f5f5f3;
  box-shadow: 0 2px 7px rgba(0, 0, 0, 0.5);
}
input[type="range"]::-moz-range-track {
  height: 4px;
  border-radius: 999px;
  background: #36363a;
}
input[type="range"]::-moz-range-thumb {
  width: 20px;
  height: 20px;
  border: 0;
  border-radius: 50%;
  background: #f5f5f3;
}

.history-row {
  display: flex;
  align-items: center;
  gap: 7px;
  margin-top: 7px;
  padding-top: 7px;
  border-top: 1px solid var(--border);
}
.danger-link {
  flex: 0 0 auto;
  min-height: 44px !important;
  padding: 0 8px;
  border: 0;
  background: transparent;
  color: #ff8c76;
  font-size: 11px;
}
.history-strip {
  display: flex;
  flex: 1;
  gap: 6px;
  overflow-x: auto;
  scrollbar-width: none;
}
.history-strip::-webkit-scrollbar { display: none; }
.history-item {
  flex: 0 0 44px;
  width: 44px;
  height: 44px;
  min-height: 44px !important;
  padding: 2px;
  overflow: hidden;
  border-radius: 9px !important;
  background: #242427;
}
.history-item.selected { border-color: var(--accent); }
.history-item img {
  width: 100%;
  height: 100%;
  border-radius: 6px;
  object-fit: cover;
}

.visually-hidden {
  position: fixed;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

.intro-screen {
  position: absolute;
  inset: 0;
  z-index: 10;
  overflow-y: auto;
  overscroll-behavior: contain;
  background:
    radial-gradient(circle at 50% 0%, rgba(255, 103, 70, 0.12), transparent 34%),
    var(--bg);
  user-select: text;
  -webkit-user-select: text;
}

.intro-content {
  width: min(100%, 540px);
  min-height: 100%;
  margin: 0 auto;
  padding: max(28px, env(safe-area-inset-top)) max(18px, env(safe-area-inset-right)) max(24px, env(safe-area-inset-bottom)) max(18px, env(safe-area-inset-left));
}

.eyebrow {
  margin-bottom: 7px;
  color: var(--accent);
  font-size: 11px;
  font-weight: 720;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h1,
h2 { margin: 0; letter-spacing: -0.025em; }
h1 { max-width: 360px; font-size: clamp(27px, 9vw, 38px); line-height: 1.04; }
h2 { font-size: 22px; }

.intro-lede {
  margin-top: 12px;
  color: #d2d2d5;
  font-size: 15px;
  line-height: 1.5;
}

.intro-clarification,
.guide-clarification {
  margin-top: 13px;
  padding: 11px 12px;
  border-left: 3px solid var(--accent);
  border-radius: 4px 10px 10px 4px;
  background: rgba(255, 103, 70, 0.1);
  color: #f0d4ce;
  font-size: 13px;
  font-weight: 620;
  line-height: 1.45;
}

.setup-diagram {
  display: block;
  width: 100%;
  height: auto;
  margin: 18px 0 12px;
  overflow: visible;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: #121214;
}
.setup-diagram .diagram-paper { fill: #323235; stroke: #6e6e73; }
.setup-diagram .diagram-drawing { fill: none; stroke: var(--accent); stroke-linecap: round; stroke-width: 2; }
.setup-diagram .diagram-stand,
.setup-diagram .diagram-arm { fill: none; stroke: #8d8d94; stroke-linecap: round; stroke-linejoin: round; stroke-width: 7; }
.setup-diagram .diagram-phone { fill: #09090a; stroke: #b0b0b5; stroke-width: 2; }
.setup-diagram .diagram-screen { fill: #242427; stroke: #56565c; }
.setup-diagram .diagram-image { fill: rgba(255, 103, 70, 0.42); stroke: var(--accent); }
.setup-diagram .diagram-camera { fill: #7bdb9f; }
.setup-diagram .diagram-direction { fill: none; stroke: #7bdb9f; stroke-linecap: round; stroke-linejoin: round; stroke-width: 2; }
.setup-diagram .diagram-hand { fill: none; stroke: #d4ad9e; stroke-linecap: round; stroke-linejoin: round; stroke-width: 3; }
.setup-diagram text { fill: #a8a8ae; font-size: 10px; font-weight: 600; }

.setup-steps {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.setup-steps li {
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  gap: 10px;
}
.setup-steps li > span {
  display: grid;
  width: 30px;
  height: 30px;
  place-items: center;
  border: 1px solid rgba(255, 103, 70, 0.34);
  border-radius: 50%;
  background: rgba(255, 103, 70, 0.1);
  color: #ff9a83;
  font-size: 12px;
  font-weight: 720;
}
.setup-steps strong { display: block; margin-bottom: 2px; font-size: 13px; }
.setup-steps p { color: #a9a9af; font-size: 12px; line-height: 1.45; }

.intro-actions {
  display: grid;
  gap: 7px;
  margin-top: 18px;
}
.intro-actions button { width: 100%; min-height: 48px; }
.secondary-action { border-color: transparent; background: transparent; color: #b9b9be; }
.privacy-note {
  margin-top: 12px;
  color: #7f7f86;
  font-size: 10px;
  line-height: 1.45;
  text-align: center;
}

.guide-backdrop {
  position: fixed;
  inset: 0;
  z-index: 20;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding-top: max(12px, env(safe-area-inset-top));
  background: rgba(0, 0, 0, 0.58);
  overscroll-behavior: contain;
}
.guide-sheet {
  width: min(100%, 560px);
  max-height: calc(100dvh - max(12px, env(safe-area-inset-top)));
  padding: 18px max(18px, env(safe-area-inset-right)) max(20px, env(safe-area-inset-bottom)) max(18px, env(safe-area-inset-left));
  overflow-y: auto;
  border: 1px solid var(--border-strong);
  border-bottom: 0;
  border-radius: 22px 22px 0 0;
  background: var(--surface);
  box-shadow: 0 -18px 50px rgba(0, 0, 0, 0.5);
  user-select: text;
  -webkit-user-select: text;
}
.guide-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.guide-header .eyebrow { margin-bottom: 3px; }
.icon-button {
  flex: 0 0 44px;
  width: 44px;
  min-height: 44px;
  padding: 0;
  border-radius: 50%;
  color: #c7c7cb;
  font-size: 24px;
  line-height: 1;
}

@media (max-height: 560px) and (orientation: landscape) {
  .control-dock { max-height: min(46dvh, 160px); }
  .camera-prompt { top: 42%; }
  .camera-prompt.with-reference { top: 34%; }
  .guide-sheet { border-radius: 18px 18px 0 0; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}

@media (min-width: 700px) {
  .app-shell {
    max-width: 900px;
    margin: 0 auto;
    padding: 14px;
  }
  .viewport {
    height: calc(100dvh - 28px);
    min-height: calc(100dvh - 28px);
    border: 1px solid var(--border-strong);
    border-radius: 22px;
  }
}