/* ========================================
   CSS Variables - Theme Tokens
   ======================================== */
:root {
  /* Background */
  --bg-gradient-1: #1a1a2e;
  --bg-gradient-2: #16213e;
  --bg-gradient-3: #0f3460;

  /* Glass */
  --glass-bg: rgba(255, 255, 255, 0.08);
  --glass-bg-hover: rgba(255, 255, 255, 0.12);
  --glass-bg-light: rgba(255, 255, 255, 0.05);
  --glass-border: rgba(255, 255, 255, 0.15);
  --glass-border-hover: rgba(255, 255, 255, 0.2);
  --glass-blur: blur(20px);
  --glass-blur-sm: blur(10px);
  --glass-blur-lg: blur(15px);

  /* Text */
  --text-primary: #fff;
  --text-secondary: rgba(255, 255, 255, 0.7);
  --text-muted: rgba(255, 255, 255, 0.4);
  --text-dim: rgba(255, 255, 255, 0.5);

  /* Accent Colors */
  --accent-cyan: rgba(0, 212, 255, 0.9);
  --accent-cyan-light: rgba(0, 212, 255, 0.5);
  --accent-cyan-glow: rgba(0, 212, 255, 0.2);
  --accent-green: rgba(0, 230, 118, 0.8);
  --accent-yellow: rgba(255, 200, 0, 0.9);

  /* Button Gradients */
  --btn-primary-bg: linear-gradient(135deg, rgba(0, 212, 255, 0.4), rgba(0, 150, 255, 0.3));
  --btn-primary-bg-hover: linear-gradient(135deg, rgba(0, 212, 255, 0.6), rgba(0, 150, 255, 0.5));
  --btn-primary-border: rgba(0, 212, 255, 0.4);
  --btn-danger-bg: linear-gradient(135deg, rgba(255, 82, 82, 0.3), rgba(233, 30, 99, 0.3));
  --btn-danger-bg-hover: linear-gradient(135deg, rgba(255, 82, 82, 0.5), rgba(233, 30, 99, 0.5));
  --btn-danger-border: rgba(255, 82, 82, 0.4);
  --btn-success-bg: linear-gradient(135deg, rgba(0, 230, 118, 0.3), rgba(0, 200, 83, 0.3));
  --btn-success-bg-hover: linear-gradient(135deg, rgba(0, 230, 118, 0.5), rgba(0, 200, 83, 0.5));
  --btn-success-border: rgba(0, 230, 118, 0.4);

  /* Spacing & Radius */
  --radius-lg: 20px;
  --radius-md: 12px;
  --radius-sm: 10px;
  --panel-width: 320px;
  --panel-gap: 20px;

  /* Shadows */
  --shadow-glass: 0 8px 32px rgba(0, 0, 0, 0.3),
    inset 0 0 0 1px rgba(255, 255, 255, 0.05);
  --shadow-btn-hover: 0 5px 20px rgba(0, 0, 0, 0.2);
}

/* ========================================
   Reset & Base
   ======================================== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html,
body {
  height: 100%;
  font-family: 'Segoe UI', 'Apple SD Gothic Neo', sans-serif;
  overflow: hidden;
  overscroll-behavior: none;
}

body {
  background: linear-gradient(135deg,
      var(--bg-gradient-1) 0%,
      var(--bg-gradient-2) 50%,
      var(--bg-gradient-3) 100%);
  position: relative;
  padding: 0 max(0px, env(safe-area-inset-right, 0px)) max(0px, env(safe-area-inset-bottom, 0px)) max(0px, env(safe-area-inset-left, 0px));
}

/* ========================================
   Top Toolbar
   ======================================== */
#top-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  color: white;
  padding: 0 16px;
  padding-top: env(safe-area-inset-top, 0px);
  height: calc(36px + env(safe-area-inset-top, 0px));
  position: relative;
  z-index: 20;
}

#top-toolbar .toolbar-btn {
  background: none;
  border: none;
  color: rgba(255, 255, 255, 0.8);
  cursor: pointer;
  padding: 4px 10px;
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: 13px;
  border-radius: 8px;
  transition: background 0.2s, color 0.2s;
}

#top-toolbar .toolbar-btn:hover {
  background: rgba(255, 255, 255, 0.15);
  color: white;
}

#top-toolbar .toolbar-btn .material-icons-round {
  font-size: 20px;
}

/* ========================================
   Background Decoration (Blur Circles)
   ======================================== */
body::before,
body::after {
  content: '';
  position: absolute;
  border-radius: 50%;
  filter: blur(100px);
  z-index: 0;
}

body::before {
  width: 400px;
  height: 400px;
  background: rgba(0, 212, 255, 0.3);
  top: -100px;
  left: -100px;
}

body::after {
  width: 500px;
  height: 500px;
  background: rgba(233, 30, 99, 0.25);
  bottom: -150px;
  right: -150px;
}

/* ========================================
   Glass Panel
   ======================================== */
#panel {
  position: absolute;
  top: calc(36px + var(--panel-gap));
  left: var(--panel-gap);
  bottom: var(--panel-gap);
  width: var(--panel-width);
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  display: flex;
  flex-direction: column;
  padding: 20px;
  overflow-y: auto;
  overflow-x: hidden;
  z-index: 10;
  box-shadow: var(--shadow-glass);
}

.panel-title {
  color: var(--text-primary);
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 20px;
  padding-bottom: 15px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  letter-spacing: 0.5px;
}

/* ========================================
   Controls Area
   ======================================== */
/* ─── 라인 툴바 ─── */
#line-toolbar {
  display: flex;
  gap: 6px;
  padding: 6px 0;
  align-items: center;
  margin-bottom: 8px;
}
#lineSelect {
  flex: 1;
  font-size: 13px;
  padding: 5px 8px;
  border-radius: 6px;
  border: 1px solid var(--glass-border);
  background: #1a1a2e;
  color: var(--text-primary);
}
#lineSelect option {
  background: #1a1a2e;
  color: #fff;
}
#lineName {
  width: 70px;
  font-size: 12px;
  padding: 5px 6px;
  border-radius: 6px;
  border: 1px solid var(--glass-border);
  background: #1a1a2e;
  color: var(--text-primary);
}
#lineName::placeholder {
  color: rgba(255, 255, 255, 0.35);
}
#line-toolbar button {
  padding: 5px 10px;
  font-size: 12px;
  white-space: nowrap;
}

/* ─── 오프셋 그룹 ─── */
#offset-group {
  display: flex;
  gap: 6px;
  width: 100%;
}
#offset-group .field {
  flex: 1;
}
#offset-group .field label {
  font-size: 11px;
  color: var(--text-secondary);
}
#offset-group .field input {
  width: 100%;
  box-sizing: border-box;
}

/* ─── 라인 스프레드 간격 입력 ─── */
.spread-gap-input {
  background: #1a1a2e;
  border: 1px solid rgba(0, 212, 255, 0.4);
  border-radius: 8px;
  padding: 6px 10px;
  color: #fff;
  font-size: 13px;
  width: 60px;
  text-align: center;
  outline: none;
}
.spread-gap-input:focus {
  border-color: rgba(0, 212, 255, 0.8);
  box-shadow: 0 0 12px rgba(0, 212, 255, 0.3);
}
.spread-gap-label {
  color: rgba(255, 255, 255, 0.7);
  font-size: 11px;
  font-weight: 600;
  pointer-events: none;
  white-space: nowrap;
}

/* ─── 라인 섞기 모달 ─── */
.shuffle-modal {
  position: fixed;
  z-index: 10000;
  width: 280px;
  background: var(--bg-gradient-1);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.5), inset 0 0 0 1px rgba(255, 255, 255, 0.05);
  backdrop-filter: var(--glass-blur);
  overflow: hidden;
  user-select: none;
}
.shuffle-title {
  display: flex;
  align-items: center;
  padding: 10px 14px;
  background: linear-gradient(135deg, rgba(0, 212, 255, 0.15), rgba(0, 150, 255, 0.1));
  color: var(--text-primary);
  font-size: 14px;
  font-weight: 700;
  cursor: grab;
  touch-action: none;
}
.shuffle-title:active { cursor: grabbing; }
.shuffle-close {
  margin-left: auto;
  box-sizing: border-box;
  width: 28px;
  height: 28px;
  display: inline-grid;
  place-items: center;
  padding: 0;
  border: 0;
  background: transparent;
  cursor: pointer;
  font: 20px/1 Arial, sans-serif;
  text-align: center;
  color: var(--text-muted);
  transition: color 0.2s;
}
.shuffle-close:hover { color: var(--text-primary); }
.shuffle-body {
  padding: 12px 14px;
}
.shuffle-info {
  font-size: 11px;
  color: var(--text-secondary);
  margin-bottom: 8px;
}
.shuffle-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 12px;
  margin-bottom: 10px;
}
.shuffle-table th {
  color: var(--text-muted);
  font-weight: 600;
  text-align: center;
  padding: 4px 6px;
  border-bottom: 1px solid var(--glass-border);
}
.shuffle-table td {
  color: var(--text-secondary);
  text-align: center;
  padding: 3px 6px;
}
.shuffle-input-row {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-bottom: 10px;
}
.shuffle-input-row label {
  font-size: 11px;
  color: var(--text-secondary);
  font-weight: 600;
}
.shuffle-order-input {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--glass-border);
  border-radius: 8px;
  padding: 8px 12px;
  color: var(--text-primary);
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 4px;
  text-align: center;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.shuffle-order-input:focus {
  border-color: var(--accent-cyan);
  box-shadow: 0 0 12px var(--accent-cyan-glow);
}
.shuffle-hint {
  font-size: 10px;
  color: var(--text-muted);
  text-align: center;
}
.shuffle-actions {
  display: flex;
  justify-content: flex-end;
}
.shuffle-apply-btn {
  background: var(--btn-primary-bg);
  border: 1px solid var(--btn-primary-border);
  border-radius: 8px;
  padding: 6px 18px;
  color: var(--text-primary);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s, box-shadow 0.2s;
}
.shuffle-apply-btn:hover {
  background: var(--btn-primary-bg-hover);
  box-shadow: var(--shadow-btn-hover);
}
.shuffle-error {
  display: none;
  margin-top: 8px;
  padding: 6px 10px;
  background: rgba(255, 82, 82, 0.15);
  border: 1px solid rgba(255, 82, 82, 0.3);
  border-radius: 6px;
  color: #ff8a80;
  font-size: 11px;
}
.shuffle-badge {
  display: inline-block;
  margin-left: 6px;
  padding: 1px 6px;
  background: linear-gradient(135deg, rgba(255, 200, 0, 0.3), rgba(255, 150, 0, 0.2));
  border: 1px solid rgba(255, 200, 0, 0.4);
  border-radius: 4px;
  color: var(--accent-yellow);
  font-size: 10px;
  font-weight: 700;
  cursor: pointer;
  vertical-align: middle;
  transition: background 0.2s;
}
.shuffle-badge:hover {
  background: linear-gradient(135deg, rgba(255, 200, 0, 0.5), rgba(255, 150, 0, 0.4));
}

/* ─── 라인 퀵 선택 탭 바 ─── */
#line-quick-bar {
  position: absolute;
  top: 36px;
  left: calc(var(--panel-width) + var(--panel-gap) * 2);
  right: var(--panel-gap);
  display: flex;
  gap: 0;
  z-index: 15;
  background: rgba(0, 0, 0, 0.35);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  padding: 0 4px;
  overflow-x: auto;
  scrollbar-width: none;
}
#line-quick-bar::-webkit-scrollbar { display: none; }
#line-quick-bar:empty { display: none; }
.line-quick-btn {
  padding: 5px 14px;
  border: none;
  border-bottom: 2px solid transparent;
  background: transparent;
  color: rgba(255, 255, 255, 0.5);
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.15s;
}
.line-quick-btn:hover {
  color: rgba(255, 255, 255, 0.85);
  background: rgba(255, 255, 255, 0.05);
}
.line-quick-btn.selected {
  color: #ffcc00;
  border-bottom-color: #ffcc00;
  background: rgba(255, 204, 0, 0.1);
}
.line-quick-btn.active {
  color: #00d4ff;
  border-bottom-color: #00d4ff;
  background: rgba(0, 212, 255, 0.08);
}
.line-quick-btn.active.selected {
  color: #00d4ff;
  border-bottom-color: #00d4ff;
  background: rgba(0, 212, 255, 0.12);
  box-shadow: inset 0 -3px 0 #ffcc00;
}
.line-select-badge {
  padding: 3px 10px;
  font-size: 11px;
  color: #ffcc00;
  opacity: 0.8;
  white-space: nowrap;
  align-self: center;
}

.line-name-label {
  background: rgba(0, 0, 0, 0.6);
  padding: 1px 6px;
  border-radius: 8px;
  white-space: nowrap;
  pointer-events: none;
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.8);
}

#controls {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 20px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.field label {
  color: var(--text-secondary);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  transition: color 0.3s ease;
}

.field label.clickable {
  background: rgba(0, 212, 255, 0.2);
  padding: 4px 8px;
  border-radius: 6px;
  border: 1px solid rgba(0, 212, 255, 0.3);
  cursor: pointer;
}

.field label.clickable:hover {
  color: var(--accent-cyan);
  background: rgba(0, 212, 255, 0.3);
}

/* ========================================
   Inputs & Selects (Glass Style)
   ======================================== */
input,
select {
  padding: 10px 14px;
  font-size: 0.9rem;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  outline: none;
  transition: all 0.3s ease;
}

input:focus,
select:focus {
  background: var(--glass-bg-hover);
  border-color: var(--accent-cyan-light);
  box-shadow: 0 0 20px var(--accent-cyan-glow);
}

input::placeholder {
  color: var(--text-muted);
}

input[type="number"] {
  width: 80px;
}

select {
  cursor: pointer;
}

/* ========================================
   Buttons (Glass Style)
   ======================================== */
button {
  padding: 10px 16px;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.3s ease;
  backdrop-filter: var(--glass-blur-sm);
}

button:hover {
  background: rgba(255, 255, 255, 0.2);
  transform: translateY(-2px);
  box-shadow: var(--shadow-btn-hover);
}

button.primary {
  background: var(--btn-primary-bg);
  border-color: var(--btn-primary-border);
}

button.primary:hover {
  background: var(--btn-primary-bg-hover);
}

button.danger {
  background: var(--btn-danger-bg);
  border-color: var(--btn-danger-border);
}

button.danger:hover {
  background: var(--btn-danger-bg-hover);
}

button.success {
  background: var(--btn-success-bg);
  border-color: var(--btn-success-border);
}

button.success:hover {
  background: var(--btn-success-bg-hover);
}

/* Small icon buttons (segment del/add) */
.btn-icon {
  width: 20px;
  height: 20px;
  padding: 0;
  font-size: 0.75rem;
  font-weight: 700;
  line-height: 1;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.btn-icon:hover {
  transform: scale(1.15);
}

/* Mid-bending toggle button */
.midBtn {
  padding: 6px 10px;
  font-size: 0.7rem;
  line-height: 1.3;
}

/* ========================================
   Segments
   ======================================== */
#segs {
  display: flex;
  flex-direction: column;
  gap: 12px;
  flex: 1;
}

.seg-block {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.segment {
  background: var(--glass-bg-light);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-md);
  padding: 12px;
  display: flex;
  flex-wrap: nowrap;
  align-items: center;
  gap: 8px;
  transition: all 0.3s ease;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.segment:hover {
  background: var(--glass-bg);
  border-color: var(--glass-border-hover);
}

.segment-mid {
  background: rgba(0, 212, 255, 0.05);
  border: 1px dashed rgba(0, 212, 255, 0.3);
  border-radius: var(--radius-md);
  padding: 10px 12px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

/* Direction select - disabled options (same-axis restriction) */
select.dir option:disabled {
  color: #ff5555;
  text-decoration: line-through;
}

/* Segment input sizing */
.segment .dir,
.segment-mid .midDir {
  padding: 8px 10px;
  font-size: 0.8rem;
  width: auto;
}

.segment .len,
.segment .ang,
.segment .compAng {
  width: 60px;
  padding: 8px 10px;
  font-size: 0.8rem;
}

.segment-mid .midLen {
  width: 60px;
  padding: 8px 10px;
  font-size: 0.8rem;
}

.segment-mid .midAng {
  width: 50px;
  padding: 8px 10px;
  font-size: 0.8rem;
}

/* Input groups with labels */
.input-group {
  display: flex;
  align-items: center;
  gap: 4px;
}

.input-label {
  color: var(--text-dim);
  font-size: 0.65rem;
  font-weight: 600;
  min-width: 14px;
  text-align: center;
}

.input-label.length {
  color: var(--accent-green);
}

.input-label.angle {
  color: var(--accent-yellow);
}

/* Segment action buttons wrapper */
.seg-actions {
  display: inline-flex;
  flex-direction: column;
  margin-left: auto;
  vertical-align: middle;
  gap: 4px;
}

/* Compound angle toggle button */
.compToggleBtn {
  padding: 4px 8px;
  font-size: 0.65rem;
  font-weight: 700;
  border-radius: 4px;
  background: rgba(255, 200, 0, 0.15);
  border: 1px solid rgba(255, 200, 0, 0.3);
  color: var(--accent-yellow);
  backdrop-filter: none;
}

.compToggleBtn:hover {
  background: rgba(255, 200, 0, 0.3);
  transform: scale(1.05);
}

.compToggleBtn.active {
  background: rgba(255, 200, 0, 0.35);
  border-color: rgba(255, 200, 0, 0.6);
  box-shadow: 0 0 10px rgba(255, 200, 0, 0.2);
}

/* Entry comp toggle button (red) */
.entryCompToggleBtn {
  padding: 4px 8px;
  font-size: 0.65rem;
  font-weight: 700;
  border-radius: 4px;
  background: rgba(255, 82, 82, 0.15);
  border: 1px solid rgba(255, 82, 82, 0.3);
  color: rgba(255, 82, 82, 0.9);
  backdrop-filter: none;
}

.entryCompToggleBtn:hover {
  background: rgba(255, 82, 82, 0.3);
  transform: scale(1.05);
}

.entryCompToggleBtn.active {
  background: rgba(255, 82, 82, 0.35);
  border-color: rgba(255, 82, 82, 0.6);
  box-shadow: 0 0 10px rgba(255, 82, 82, 0.2);
}

/* Compound angle group */
.comp-angle-group {
  display: flex;
  align-items: center;
  gap: 6px;
}

.comp-angle-group .compAng {
  width: 60px;
  padding: 8px 10px;
  font-size: 0.8rem;
  border-color: rgba(255, 200, 0, 0.3);
}

/* Entry compound angle group */
.entry-comp-angle-group {
  display: flex;
  align-items: center;
  gap: 6px;
}

.entry-comp-angle-group .entryCompAng {
  width: 60px;
  padding: 8px 10px;
  font-size: 0.8rem;
  border-color: rgba(255, 82, 82, 0.3);
}

.comp-angle-group .compAng:focus {
  border-color: rgba(255, 200, 0, 0.6);
  box-shadow: 0 0 15px rgba(255, 200, 0, 0.15);
}

/* ========================================
   3D Canvas Area
   ======================================== */
#canvas3d {
  position: absolute;
  top: calc(36px + var(--panel-gap) + env(safe-area-inset-top, 0px));
  right: var(--panel-gap);
  bottom: var(--panel-gap);
  left: calc(var(--panel-width) + var(--panel-gap) * 2);
  background: rgba(0, 0, 0, 0.4);
  backdrop-filter: var(--glass-blur-sm);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-lg);
  overflow: hidden;
  z-index: 5;
}

/* ========================================
   Canvas Overlay Buttons
   ======================================== */
.canvas-btn {
  position: absolute;
  z-index: 10;
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: var(--glass-blur-lg);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-sm);
  padding: 8px 12px;
  color: var(--text-primary);
  font-size: 0.8rem;
  cursor: pointer;
  transition: all 0.3s ease;
  white-space: nowrap;
}

.canvas-btn:hover {
  background: rgba(255, 255, 255, 0.2);
  transform: scale(1.05);
}

#labelSizeBtn {
  top: 16px;
  right: 210px;
}

#viewReset {
  top: 16px;
  right: 110px;
}

#full {
  top: 16px;
  right: 16px;
}

/* ========================================
   Mode Label
   ======================================== */
#modeLabel {
  position: absolute;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 20;
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.6);
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: var(--glass-blur-sm);
  padding: 8px 24px;
  border-radius: 20px;
  border: 1px solid rgba(255, 255, 255, 0.15);
  font-weight: 600;
  letter-spacing: 3px;
  text-transform: uppercase;
  pointer-events: none;
}

/* ========================================
   Result Area
   ======================================== */
#result {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-md);
  padding: 10px 14px;
  color: var(--text-primary);
  font-size: 0.85rem;
  line-height: 1.5;
  flex-shrink: 0;
}

#result:empty {
  display: none;
}

/* Result table collapsible */
.result-details summary {
  cursor: pointer;
  color: var(--accent-cyan);
  font-size: 0.85rem;
  font-weight: 600;
  padding-bottom: 8px;
  user-select: none;
  list-style: none;
}

.result-details summary::-webkit-details-marker {
  display: none;
}

.result-details summary::before {
  content: '\25BC  ';
  font-size: 0.7rem;
}

.result-details:not([open]) summary::before {
  content: '\25B6  ';
}

.result-table {
  border-collapse: collapse;
}

.result-table th,
.result-table td {
  padding: 2px 8px;
}

.result-table th {
  color: var(--accent-cyan);
}

.result-table td {
  color: var(--text-primary);
}

/* ========================================
   3D Scene Labels
   ======================================== */
.angle-label,
.helperLabel,
.angle-error {
  font-size: 0.8rem;
  padding: 2px 4px;
  border-radius: 3px;
  pointer-events: none;
  white-space: nowrap;
}

.angle-label {
  color: #fff;
  background: rgba(0, 0, 0, 0.6);
}

.angle-error {
  color: #fff;
  background: rgba(255, 0, 0, 0.7);
}

.helperLabel {
  color: #fff;
  background: rgba(255, 0, 0, 0.6);
}

.helperLabel.blue {
  color: #fff;
  background: rgba(0, 0, 255, 0.6);
}

.bend-order-label {
  font-size: 0.6rem;
  padding: 1px 5px;
  border-radius: 8px;
  background: rgba(255, 140, 0, 0.85);
  color: #fff;
  font-weight: 700;
  pointer-events: none;
  white-space: nowrap;
}

/* ========================================
   Custom Scrollbar
   ======================================== */
::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: rgba(255, 255, 255, 0.05);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.2);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 255, 255, 0.3);
}

/* ========================================
   Settings Modal
   ======================================== */
#settings-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
}

#settings-panel {
  background: rgba(22, 27, 44, 0.95);
  backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 16px;
  width: 340px;
  max-height: 70vh;
  overflow-y: auto;
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.4);
}

.settings-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 20px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  color: #fff;
  font-size: 1rem;
  font-weight: 600;
}

.settings-close {
  box-sizing: border-box;
  width: 32px;
  height: 32px;
  display: inline-grid;
  place-items: center;
  background: none;
  border: none;
  color: rgba(255, 255, 255, 0.5);
  font: 1.4rem/1 Arial, sans-serif;
  cursor: pointer;
  padding: 0;
  text-align: center;
  backdrop-filter: none;
}

.settings-close:hover {
  color: #fff;
  transform: none;
  box-shadow: none;
}

.settings-category {
  padding: 12px 20px;
}

.settings-category-title {
  color: rgba(255, 255, 255, 0.4);
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 10px;
}

.settings-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 0;
}

.settings-label {
  color: rgba(255, 255, 255, 0.8);
  font-size: 0.85rem;
}

/* Toggle Switch */
.settings-toggle {
  position: relative;
  width: 40px;
  height: 22px;
  cursor: pointer;
}

.settings-toggle input {
  opacity: 0;
  width: 0;
  height: 0;
  position: absolute;
}

.settings-slider {
  position: absolute;
  inset: 0;
  background: rgba(255, 255, 255, 0.12);
  border-radius: 11px;
  transition: background 0.2s;
}

.settings-slider::before {
  content: '';
  position: absolute;
  width: 16px;
  height: 16px;
  left: 3px;
  top: 3px;
  background: rgba(255, 255, 255, 0.7);
  border-radius: 50%;
  transition: transform 0.2s;
}

.settings-toggle input:checked + .settings-slider {
  background: rgba(0, 212, 255, 0.5);
}

.settings-toggle input:checked + .settings-slider::before {
  transform: translateX(18px);
  background: #fff;
}

.settings-row.settings-child {
  padding-left: 18px;
  opacity: 0.85;
}

.settings-range-wrap {
  display: flex;
  align-items: center;
  gap: 8px;
}

.settings-range {
  -webkit-appearance: none;
  width: 90px;
  height: 4px;
  background: rgba(255, 255, 255, 0.15);
  border-radius: 2px;
  outline: none;
}

.settings-range::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: rgba(0, 212, 255, 0.8);
  cursor: pointer;
}

.settings-range-value {
  color: rgba(255, 255, 255, 0.6);
  font-size: 0.75rem;
  min-width: 24px;
  text-align: right;
}

/* Select (드롭다운) */
.settings-select {
  padding: 6px 10px;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 8px;
  color: #fff;
  font-size: 0.85rem;
  cursor: pointer;
  outline: none;
}
.settings-select:focus {
  border-color: rgba(0, 212, 255, 0.5);
}
.settings-select option {
  background: #1a1a2e;
  color: #fff;
}

/* ========================================
   Compass (나침반)
   ======================================== */
#compass-container {
  position: fixed;
  bottom: 60px;
  right: 16px;
  width: 70px;
  height: 70px;
  z-index: 1002;
  background: var(--glass-bg);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  border-radius: 50%;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: grab;
  user-select: none;
  -webkit-user-select: none;
}

#compass-container:active {
  cursor: grabbing;
}

/* ─── 되돌리기 버튼 ─── */
#undo-btn {
  position: absolute;
  bottom: 16px;
  left: 16px;
  width: 50px;
  height: 50px;
  z-index: 1002;
  background: var(--glass-bg);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  border-radius: 50%;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  user-select: none;
  -webkit-user-select: none;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
  color: var(--text-primary);
  font-size: 24px;
  padding: 0;
  transition: opacity 0.2s;
}
#undo-btn:active {
  background: rgba(255, 255, 255, 0.15);
}
#undo-btn.disabled {
  opacity: 0.3;
  cursor: default;
}

#compass-ring {
  position: absolute;
  width: 60px;
  height: 60px;
  border: 2px solid rgba(255, 255, 255, 0.15);
  border-radius: 50%;
}

#compass-needle {
  position: absolute;
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  transition: transform 0.15s ease-out;
}

#compass-needle .compass-n {
  position: absolute;
  top: 8px;
  font-size: 12px;
  font-weight: bold;
  color: #ff4444;
  text-shadow: 0 0 4px rgba(255, 68, 68, 0.5);
}

#compass-needle .compass-s {
  position: absolute;
  bottom: 8px;
  font-size: 10px;
  font-weight: bold;
  color: rgba(255, 255, 255, 0.5);
}

#compass-needle .compass-arrow {
  width: 0;
  height: 0;
  border-left: 6px solid transparent;
  border-right: 6px solid transparent;
  border-bottom: 20px solid #ff4444;
  position: absolute;
  top: 18px;
  filter: drop-shadow(0 0 3px rgba(255, 68, 68, 0.6));
}

#compass-needle .compass-arrow::after {
  content: '';
  position: absolute;
  top: 20px;
  left: -6px;
  width: 0;
  height: 0;
  border-left: 6px solid transparent;
  border-right: 6px solid transparent;
  border-top: 20px solid rgba(255, 255, 255, 0.3);
}

#compass-directions {
  position: absolute;
  width: 100%;
  height: 100%;
  font-size: 8px;
  color: rgba(255, 255, 255, 0.5);
  pointer-events: none;
}

#compass-directions .dir-n {
  position: absolute;
  top: -2px;
  left: 50%;
  transform: translateX(-50%);
}

#compass-directions .dir-s {
  position: absolute;
  bottom: -2px;
  left: 50%;
  transform: translateX(-50%);
}

#compass-directions .dir-e {
  position: absolute;
  right: 0px;
  top: 50%;
  transform: translateY(-50%);
}

#compass-directions .dir-w {
  position: absolute;
  left: 2px;
  top: 50%;
  transform: translateY(-50%);
}

/* ========================================
   Segment Highlight (3D 더블클릭 → 입력행)
   ======================================== */
.seg-highlight {
  animation: segHighlight 1.5s ease;
}

@keyframes segHighlight {
  0% { background: rgba(255, 200, 0, 0.5); box-shadow: 0 0 12px rgba(255, 200, 0, 0.4); }
  100% { background: transparent; box-shadow: none; }
}

/* ========================================
   Utility Classes
   ======================================== */
.hidden {
  display: none !important;
}

/* ========================================
   CSS Fullscreen fallback (iOS)
   ======================================== */
body.css-fullscreen #panel,
body.css-fullscreen #top-toolbar,
body.css-fullscreen #line-quick-bar {
  display: none !important;
}
body.css-fullscreen #canvas3d {
  position: fixed !important;
  top: 0 !important;
  left: 0 !important;
  right: 0 !important;
  bottom: 0 !important;
  width: 100% !important;
  height: 100% !important;
  z-index: 9999;
}
body.css-fullscreen .canvas-btn {
  z-index: 10001 !important;
  position: fixed !important;
}
body.css-fullscreen #full {
  top: calc(16px + env(safe-area-inset-top, 0px));
  right: 16px;
}
body.css-fullscreen #viewReset {
  top: calc(16px + env(safe-area-inset-top, 0px));
  right: 110px;
}
body.css-fullscreen #labelSizeBtn {
  top: calc(16px + env(safe-area-inset-top, 0px));
  right: 210px;
}

/* ========================================
   Responsive (Mobile)
   ======================================== */
@media (max-width: 800px) {
  #panel {
    top: auto;
    bottom: var(--panel-gap);
    left: var(--panel-gap);
    right: var(--panel-gap);
    width: auto;
    height: 280px;
  }

  #canvas3d {
    left: var(--panel-gap);
    right: var(--panel-gap);
    top: calc(36px + var(--panel-gap) + env(safe-area-inset-top, 0px));
    bottom: 320px;
  }

  #line-quick-bar {
    left: var(--panel-gap);
  }
}