:root {
  --white: #ffffff;
  --grey-50: #f9fafb;
  --grey-100: #f2f4f6;
  --grey-200: #e5e8eb;
  --grey-300: #d1d6db;
  --grey-500: #8b95a1;
  --grey-600: #6b7684;
  --grey-700: #4e5968;
  --grey-900: #191f28;
  --blue-50: #e8f3ff;
  --blue-100: #c9e2ff;
  --blue-500: #3182f6;
  --bg: var(--grey-50);
  --surface: var(--white);
  --surface-border: var(--grey-200);
  --text: var(--grey-900);
  --text-secondary: var(--grey-700);
  --text-muted: var(--grey-500);
  --accent: var(--blue-500);
  --reset-bg: #fff5f5;
  --reset-border: #ffd6d6;
  --reset-text: #c62828;
  --reset-active: #e53935;
  --track: var(--grey-200);
  --shadow: 0 2px 12px rgba(2, 9, 19, 0.06), 0 1px 4px rgba(2, 9, 19, 0.04);
  --radius: 12px;
  --radius-sm: 8px;
  --radius-pill: 999px;
  --mobile-dock-h: clamp(220px, 42dvh, 288px);
  --dock-safe-bottom: calc(12px + env(safe-area-inset-bottom, 0px));
  --channel-launcher-size: 56px;
  --fs-ui: 15px;
  --fs-label: 14px;
  --fs-btn: 14px;
  --fs-caption: 13px;
  --fs-size-key: 13px;
  --fs-size-val: 14px;
}

.ui-desktop-only {
  display: none !important;
}

.mobile-float {
  display: contents;
}

#viewport #profileWrap {
  position: absolute;
  z-index: 3;
  pointer-events: none;
}

#viewport #profileWrap,
.mobile-float .btn,
.mobile-float .history-btns,
.mobile-float .btn-icon {
  pointer-events: auto;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

html {
  height: 100%;
  height: -webkit-fill-available;
}

body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: var(--bg);
  touch-action: manipulation;
}

/* ── Mobile-first shell (터치·인앱 브라우저 기본) ── */
#app {
  width: 100%;
  height: 100%;
  height: 100dvh;
  position: relative;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  padding-bottom: var(--dock-safe-bottom);
  box-sizing: border-box;
}

#viewport {
  position: relative;
  flex: 1 1 auto;
  min-height: 0;
  z-index: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg);
}

canvas#c {
  display: block;
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  cursor: crosshair;
  touch-action: none;
}

.btn-quote-inquiry {
  font-family: inherit;
  font-weight: 600;
  color: #fff;
  background: var(--accent);
  border: none;
  cursor: pointer;
}

.btn-quote-inquiry:disabled {
  opacity: 0.65;
  cursor: not-allowed;
}

#viewport .btn-quote-inquiry {
  position: absolute;
  right: max(12px, env(safe-area-inset-right, 0px));
  bottom: max(12px, env(safe-area-inset-bottom, 0px));
  z-index: 6;
  padding: 12px 16px;
  font-family: inherit;
  font-size: 14px;
  font-weight: 600;
  color: #fff;
  background: var(--accent);
  border: none;
  border-radius: 12px;
  box-shadow: var(--shadow);
  cursor: pointer;
}

html.layout-desktop #app > .btn-quote-inquiry {
  position: fixed;
  right: 20px;
  bottom: calc(20px + 88px);
  z-index: 6;
}

html:not(.layout-desktop) .studio-quote-bar .btn-quote-inquiry {
  position: static;
  width: 100%;
  min-height: 48px;
  padding: 13px 16px;
  font-size: 15px;
  border-radius: var(--radius-sm);
  box-shadow: none;
  margin-top: 2px;
}

.studio-topbar {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  gap: 4px;
  padding: max(6px, env(safe-area-inset-top, 0px)) max(10px, env(safe-area-inset-right, 0px)) 8px max(6px, env(safe-area-inset-left, 0px));
  background: var(--surface);
  border-bottom: 1px solid var(--surface-border);
  z-index: 10;
}

.studio-topbar__back {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  flex-shrink: 0;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  text-decoration: none;
  -webkit-tap-highlight-color: transparent;
}

.studio-topbar__back:active {
  background: var(--grey-100);
}

.studio-topbar__title {
  flex: 1;
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
  text-align: center;
  letter-spacing: -0.02em;
  padding-right: 40px;
}

.studio-quote-bar {
  width: 100%;
  flex: 0 0 auto;
  order: 2;
  padding-bottom: 0;
}

#hud {
  position: relative;
  flex: 0 0 auto;
  max-height: min(var(--mobile-dock-h), 46dvh);
  z-index: 1;
  pointer-events: auto;
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 10px max(12px, env(safe-area-inset-right, 0px)) max(8px, env(safe-area-inset-bottom, 0px)) max(12px, env(safe-area-inset-left, 0px));
  background: var(--surface);
  border-top: 1px solid var(--surface-border);
  overflow-x: hidden;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  box-shadow: 0 -4px 16px rgba(2, 9, 19, 0.06);
  font-family: 'Pretendard Variable', 'Pretendard', 'Noto Sans KR', -apple-system, sans-serif;
  font-size: var(--fs-ui);
  color: var(--text);
  letter-spacing: -0.01em;
}

.brand {
  display: none;
}

.brand-name {
  font-size: 18px;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.03em;
}

.brand-sub {
  font-size: 14px;
  font-weight: 600;
  color: var(--accent);
  margin-top: 4px;
}

.brand-hint {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-muted);
  margin-top: 10px;
  line-height: 1.55;
}

/* ── Size panel (viewport overlay) ── */
#profileWrap {
  display: flex;
  flex-direction: column;
  gap: 8px;
  background: var(--surface);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  top: max(8px, env(safe-area-inset-top, 0px));
  left: max(12px, env(safe-area-inset-left, 0px));
  right: auto;
  bottom: auto;
  align-items: flex-start;
  padding: 10px 12px;
  max-width: min(220px, calc(100vw - 100px));
}

.preview-label {
  font-size: var(--fs-caption);
  font-weight: 600;
  color: var(--text-muted);
}

.size-stats {
  min-width: 132px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.size-item {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}

.size-key {
  font-size: var(--fs-size-key);
  font-weight: 600;
  color: var(--text-muted);
}

.size-value {
  font-size: var(--fs-size-val);
  font-weight: 700;
  color: var(--text-secondary);
}

#profileWrap .size-stats {
  align-items: flex-start;
  gap: 6px;
}

#profileWrap .size-item {
  width: 100%;
}

#heightPanel,
#widthPanel {
  width: 100%;
  flex: 0 0 auto;
  min-width: 0;
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 8px;
  padding: 8px 10px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--grey-100);
  background: var(--grey-50);
  box-shadow: none;
  pointer-events: auto;
}

.panel-label {
  font-size: var(--fs-label);
  font-weight: 700;
  color: var(--text-secondary);
  flex-shrink: 0;
  min-width: 28px;
}

#vSliderWrap {
  position: relative;
  flex: 1;
  min-width: 0;
  height: 36px;
  width: auto;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: visible;
}

#heightSlider {
  -webkit-appearance: none;
  appearance: none;
  transform: none;
  width: 100%;
  height: 6px;
  background: linear-gradient(90deg, var(--accent) 0%, var(--accent) var(--pct, 12.5%), var(--track) var(--pct, 12.5%), var(--track) 100%);
  border-radius: var(--radius-pill);
  cursor: pointer;
  outline: none;
}

#heightSlider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--white);
  border: 2px solid var(--accent);
  box-shadow: 0 2px 6px rgba(49, 130, 246, 0.25);
  cursor: grab;
}

#heightSlider::-moz-range-thumb {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  border: 2px solid var(--accent);
  background: var(--white);
}

#barDot {
  position: absolute;
  top: 0;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--accent);
  border: 3px solid var(--white);
  box-shadow: 0 0 0 3px rgba(49, 130, 246, 0.25);
  opacity: 0;
  pointer-events: none;
}

#barDot.active {
  transform: translate(-50%, -50%) scale(1.15);
}

.num-row {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
}

.num-input {
  width: 48px;
  min-height: 36px;
  font-family: inherit;
  font-size: var(--fs-ui);
  font-weight: 700;
  text-align: center;
  color: var(--text);
  background: var(--grey-50);
  border: 1px solid var(--grey-200);
  padding: 7px 4px;
  outline: none;
  -moz-appearance: textfield;
  border-radius: var(--radius-sm);
}

.num-input::-webkit-inner-spin-button,
.num-input::-webkit-outer-spin-button { -webkit-appearance: none; }

.num-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--blue-50);
}

.unit {
  font-size: var(--fs-caption);
  font-weight: 500;
  color: var(--text-muted);
}

#slidersRow {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 6px;
  width: 100%;
  flex: 0 0 auto;
  order: 0;
}

#bottomDock {
  display: flex;
  flex-direction: column;
  gap: 6px;
  width: 100%;
  order: 1;
  pointer-events: auto;
}

#presetBtns {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: center;
  width: 100%;
  order: 0;
}

html:not(.layout-desktop) #presetBtns {
  flex-wrap: nowrap;
  justify-content: stretch;
  gap: 6px;
}

html:not(.layout-desktop) #viewport {
  position: relative;
  isolation: isolate;
}

html:not(.layout-desktop) .mobile-float #btnReset {
  position: absolute;
  top: max(8px, env(safe-area-inset-top, 0px));
  right: max(12px, env(safe-area-inset-right, 0px));
  left: auto;
  bottom: auto;
  z-index: 4;
  padding: 10px 14px;
  min-height: 40px;
  font-size: var(--fs-btn);
  box-shadow: var(--shadow);
}

html:not(.layout-desktop) .mobile-float #btnSmooth,
html:not(.layout-desktop) .mobile-float #btnSizeCompareM {
  position: absolute;
  top: auto;
  right: auto;
  bottom: max(8px, env(safe-area-inset-bottom, 0px));
  z-index: 4;
  min-width: 72px;
  min-height: 40px;
  padding: 10px 10px;
  font-size: 13px;
  background: rgba(255, 255, 255, 0.96);
  border: 1px solid var(--surface-border);
  box-shadow: var(--shadow);
}

html:not(.layout-desktop) .mobile-float #btnSmooth {
  left: max(12px, env(safe-area-inset-left, 0px));
}

html:not(.layout-desktop) .mobile-float #btnSizeCompareM {
  left: calc(max(12px, env(safe-area-inset-left, 0px)) + 78px);
}

html:not(.layout-desktop) .mobile-float .history-btns {
  position: absolute;
  top: auto;
  left: auto;
  bottom: max(8px, env(safe-area-inset-bottom, 0px));
  right: max(12px, env(safe-area-inset-right, 0px));
  z-index: 4;
  display: flex;
  gap: 6px;
}

html:not(.layout-desktop) .mobile-float .btn-icon {
  width: auto;
  min-width: unset;
  height: auto;
  min-height: 40px;
  min-width: 40px;
  padding: 8px 10px;
  background: rgba(255, 255, 255, 0.96);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow);
}

html:not(.layout-desktop) .mobile-float .btn-icon svg {
  width: 22px;
  height: 22px;
}

html:not(.layout-desktop) .studio-dock {
  display: none !important;
}

html:not(.layout-desktop) .dock-presets .dock-block__label {
  display: none;
}

html:not(.layout-desktop) .dock-presets {
  width: 100%;
}

html:not(.layout-desktop) #profileWrap {
  max-width: min(200px, calc(100vw - 88px));
  padding: 8px 10px;
}

html:not(.layout-desktop) #presetBtns .btn {
  min-height: 44px;
  padding: 11px 6px;
  font-size: 14px;
  flex: 1 1 0;
  min-width: 0;
}

#status {
  display: none;
}

#widthSlider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  background: linear-gradient(90deg, var(--accent) 0%, var(--accent) var(--pct, 12.5%), var(--track) var(--pct, 12.5%), var(--track) 100%);
  border-radius: var(--radius-pill);
  cursor: pointer;
  outline: none;
  flex: 1;
  min-width: 0;
}

#widthSlider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--white);
  border: 2px solid var(--accent);
  box-shadow: 0 2px 6px rgba(49, 130, 246, 0.25);
  cursor: grab;
}

#widthSlider::-moz-range-thumb {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  border: 2px solid var(--accent);
  background: var(--white);
}

.history-btns {
  display: flex;
  gap: 8px;
  flex-shrink: 0;
}

.btn-icon {
  width: 52px;
  min-width: 52px;
  height: 52px;
  min-height: 52px;
  padding: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
  border-radius: var(--radius-sm);
}

.btn-icon svg {
  display: block;
  width: 28px;
  height: 28px;
}

.btns {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: center;
  width: 100%;
  align-items: center;
}

.btn {
  font-family: inherit;
  font-size: var(--fs-btn);
  font-weight: 600;
  color: var(--text-secondary);
  background: var(--grey-50);
  border: 1px solid var(--grey-200);
  padding: 10px 18px;
  cursor: pointer;
  border-radius: var(--radius-sm);
  white-space: nowrap;
  touch-action: manipulation;
}

.btn:active {
  transform: scale(0.97);
  background: var(--accent);
  border-color: var(--accent);
  color: var(--white);
}

.btn:disabled {
  opacity: 0.42;
  cursor: not-allowed;
  pointer-events: none;
  transform: none;
}

.btn-reset {
  color: var(--reset-text);
  background: var(--reset-bg);
  border-color: var(--reset-border);
}

.btn-reset:active {
  background: var(--reset-active);
  border-color: var(--reset-active);
  color: var(--white);
}

.btn-toggle-on {
  color: var(--white);
  background: var(--accent);
  border-color: var(--accent);
}

.btn-toggle-on:active {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--white);
}

#status.active {
  color: var(--accent);
  border-color: var(--blue-100);
  background: var(--blue-50);
}

/* ── Confirm dialog ── */
.confirm-dialog {
  border: none;
  padding: 0;
  margin: auto;
  max-width: min(320px, calc(100vw - 40px));
  width: calc(100% - 40px);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: 0 8px 32px rgba(2, 9, 19, 0.16);
  font-family: 'Pretendard Variable', 'Pretendard', 'Noto Sans KR', -apple-system, sans-serif;
}

.confirm-dialog::backdrop {
  background: rgba(25, 31, 40, 0.45);
}

.confirm-dialog-inner {
  padding: 24px 20px 20px;
}

.confirm-dialog-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--text);
  line-height: 1.4;
}

.confirm-dialog-desc {
  margin-top: 10px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-muted);
  line-height: 1.5;
}

.confirm-dialog-actions {
  display: flex;
  gap: 8px;
  margin-top: 22px;
}

.confirm-dialog-actions .btn {
  flex: 1;
  min-height: 44px;
}

/* ── Desktop (넓은 화면 + 마우스) ── */
@media (min-width: 1025px) {
  html.layout-desktop {
    --fs-ui: 15px;
    --fs-label: 14px;
    --fs-btn: 15px;
    --fs-caption: 13px;
    --fs-size-key: 13px;
    --fs-size-val: 14px;
  }

  html.layout-desktop #app {
    display: block;
    padding-bottom: 0;
    height: 100%;
  }

  html.layout-desktop #viewport {
    position: fixed;
    inset: 0;
    display: block;
    flex: none;
  }

  html.layout-desktop #hud {
    position: fixed;
    inset: 0;
    max-height: none;
    padding: 0;
    background: transparent;
    border: none;
    box-shadow: none;
    overflow: visible;
    pointer-events: none;
  }

  html.layout-desktop .brand {
    display: block;
    position: absolute;
    top: 20px;
    left: 20px;
    padding: 16px 20px;
    max-width: 260px;
    pointer-events: auto;
  }

  html.layout-desktop #profileWrap {
    top: 20px;
    right: 20px;
    left: auto;
    align-items: center;
    padding: 14px 16px;
    max-width: none;
    pointer-events: auto;
  }

  html.layout-desktop #profileWrap .size-stats {
    align-items: stretch;
    gap: 8px;
  }

  html.layout-desktop .ui-desktop-only {
    display: inline-block !important;
  }

  html.layout-desktop .ui-mobile-only {
    display: none !important;
  }

  html.layout-desktop #bottomDock {
    position: absolute;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: row;
    flex-wrap: nowrap;
    align-items: center;
    justify-content: center;
    gap: 0;
    width: min(720px, calc(100vw - 48px));
    padding: 12px 8px;
    background: var(--surface);
    border: 1px solid var(--surface-border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    pointer-events: all;
  }

  html.layout-desktop .studio-dock {
    display: flex;
    flex-direction: row;
    align-items: center;
    flex: 0 1 auto;
    background: transparent;
    border: none;
    border-radius: 0;
    box-shadow: none;
    overflow: visible;
  }

  html.layout-desktop .studio-dock__row--tools {
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: 0;
  }

  html.layout-desktop .dock-block {
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: 10px;
    padding: 0 16px;
    min-width: 0;
    border-left: 1px solid var(--grey-100);
  }

  html.layout-desktop .studio-dock .dock-block:first-child {
    border-left: none;
    padding-left: 8px;
  }

  html.layout-desktop .dock-block__label {
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--text-muted);
    white-space: nowrap;
    flex-shrink: 0;
  }

  html.layout-desktop .dock-block__body {
    display: flex;
    align-items: center;
    gap: 6px;
  }

  html.layout-desktop .dock-block__body--actions {
    flex-wrap: nowrap;
    gap: 8px;
  }

  html.layout-desktop .studio-dock .history-btns {
    display: flex;
    gap: 6px;
  }

  html.layout-desktop .studio-dock .btn-icon {
    width: 40px;
    min-width: 40px;
    height: 40px;
    min-height: 40px;
    padding: 0;
    background: var(--grey-50);
  }

  html.layout-desktop .studio-dock .btn-icon svg {
    width: 22px;
    height: 22px;
  }

  html.layout-desktop .dock-presets {
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: 10px;
    flex: 1 1 auto;
    min-width: 0;
    padding: 0 12px 0 16px;
    margin: 0;
    border-left: 1px solid var(--grey-100);
    background: transparent;
    border-radius: 0;
    box-shadow: none;
  }

  html.layout-desktop .dock-presets .dock-block__label {
    display: block;
    flex-shrink: 0;
  }

  html.layout-desktop .dock-presets #presetBtns {
    justify-content: flex-start;
    gap: 8px;
    flex-wrap: nowrap;
    flex: 1;
    min-width: 0;
  }

  html.layout-desktop .dock-presets .btn {
    padding: 9px 16px;
    min-height: auto;
    flex: 0 1 auto;
    min-width: auto;
    white-space: nowrap;
  }

  html.layout-desktop #slidersRow {
    display: block;
    position: static;
    width: auto;
    height: auto;
    order: 0;
  }

  html.layout-desktop #heightPanel {
    position: absolute;
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
    flex-direction: column;
    align-items: center;
    gap: 12px;
    padding: 18px 16px;
    background: var(--surface);
    border: 1px solid var(--surface-border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    width: auto;
  }

  html.layout-desktop #vSliderWrap {
    width: 36px;
    height: 220px;
    flex: none;
  }

  html.layout-desktop #heightSlider {
    transform: rotate(-90deg);
    width: 220px;
  }

  html.layout-desktop #barDot {
    display: block;
  }

  html.layout-desktop #slidersRow #widthPanel {
    position: absolute;
    bottom: calc(20px + 72px);
    left: 50%;
    transform: translateX(-50%);
    width: min(480px, calc(100vw - 48px));
    padding: 12px 18px;
    gap: 16px;
    background: var(--surface);
    border: 1px solid var(--surface-border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    z-index: 2;
  }

  html.layout-desktop #widthSlider {
    width: min(280px, 50vw);
    min-width: 120px;
    flex: 1;
  }

  html.layout-desktop .num-input {
    width: 52px;
    min-height: auto;
    padding: 7px 4px;
  }

  html.layout-desktop #status {
    display: block;
    position: absolute;
    bottom: 20px;
    left: 20px;
    font-size: var(--fs-caption);
    font-weight: 600;
    color: var(--text-muted);
    padding: 8px 14px;
    background: var(--surface);
    border: 1px solid var(--surface-border);
    border-radius: var(--radius-pill);
    box-shadow: var(--shadow);
    pointer-events: auto;
  }
}

@media (max-width: 380px) {
  :root {
    --mobile-dock-h: clamp(200px, 42dvh, 280px);
  }

  html:not(.layout-desktop) #presetBtns .btn {
    padding: 10px 4px;
    font-size: 13px;
  }
}

/* 모바일·터치·인앱: 슬라이더 2줄 유지 (데스크톱 클래스 없을 때) */
html:not(.layout-desktop) #slidersRow {
  display: flex;
  flex-direction: column;
  align-items: stretch;
}

html:not(.layout-desktop) #heightPanel,
html:not(.layout-desktop) #widthPanel {
  width: 100%;
  flex: 0 0 auto;
  flex-direction: row;
  position: static;
  transform: none;
}