/* ─── PREMIUM MODERN SYSTEM DESIGN TOKENS ───────────────── */
:root {
  /* HSL tailored color palette */
  --slate-50:  #f8fafc;
  --slate-100: #f1f5f9;
  --slate-200: #e2e8f0;
  --slate-300: #cbd5e1;
  --slate-700: #334155;
  --slate-800: #1e293b;
  --slate-900: #0f172a;
  
  --violet-500: #8b5cf6;
  --violet-600: #7c3aed;
  --violet-700: #6d28d9;
  
  --teal-500: #14b8a6;
  --teal-600: #0d9488;
  --teal-700: #0f766e;
  
  --primary-grad: linear-gradient(135deg, var(--violet-600), var(--violet-700));
  --success-grad: linear-gradient(135deg, var(--teal-600), var(--teal-700));
  
  --radius-xl: 20px;
  --radius-lg: 16px;
  --radius-md: 12px;
  --radius-sm: 8px;
  
  --font-main: 'Outfit', 'Noto Sans TC', sans-serif;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --shadow-lux: 0 10px 30px -5px rgba(0, 0, 0, 0.08), 0 4px 12px -2px rgba(0, 0, 0, 0.03);
  --shadow-btn: 0 4px 14px rgba(124, 58, 237, 0.2);
}

/* ─── BASE RESET ────────────────────────────────────────── */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: var(--font-main);
  background-color: var(--slate-100);
  color: var(--slate-900);
  height: 100vh;
  display: flex;
  overflow: hidden;
}

/* ─── DOCK (LEFT SIDEBAR) ────────────────────────────────── */
.app-dock {
  width: 90px;
  background-color: var(--slate-900);
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 24px 0;
  gap: 20px;
  z-index: 30;
  box-shadow: 4px 0 20px rgba(0,0,0,0.15);
}

.dock-logo {
  font-size: 32px;
  margin-bottom: 20px;
  filter: drop-shadow(0 4px 8px rgba(139, 92, 246, 0.4));
  cursor: pointer;
  transition: var(--transition);
}

.dock-logo:hover {
  transform: rotate(15deg) scale(1.1);
}

.dock-menu {
  display: flex;
  flex-direction: column;
  gap: 12px;
  width: 100%;
  padding: 0 10px;
}

.dock-item {
  width: 100%;
  aspect-ratio: 1;
  background: transparent;
  border: none;
  border-radius: var(--radius-md);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
  cursor: pointer;
  color: var(--slate-300);
  transition: var(--transition);
  padding: 6px;
}

.dock-item i {
  font-size: 20px;
  transition: var(--transition);
}

.dock-item span {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: -0.2px;
  white-space: nowrap;
}

.dock-item:hover {
  background-color: rgba(255,255,255,0.06);
  color: white;
}

.dock-item:hover i {
  transform: translateY(-2px);
}

.dock-item.active {
  background: var(--primary-grad);
  color: white;
  box-shadow: 0 8px 16px rgba(124, 58, 237, 0.3);
}

.dock-item.active i {
  transform: scale(1.1);
}

/* ─── CENTRAL SETTINGS DRAWER ────────────────────────────── */
.settings-drawer {
  width: 380px;
  background-color: white;
  border-right: 1px solid var(--slate-200);
  display: flex;
  flex-direction: column;
  z-index: 20;
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1), margin-left 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  box-shadow: 10px 0 30px rgba(0,0,0,0.02);
}

.settings-drawer.collapsed {
  margin-left: -380px;
}

.drawer-header {
  padding: 24px;
  border-bottom: 1px solid var(--slate-200);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.drawer-header h2 {
  font-size: 18px;
  font-weight: 800;
  letter-spacing: -0.5px;
  color: var(--slate-900);
}

.drawer-header p {
  font-size: 11px;
  color: var(--slate-500);
  font-weight: 500;
}

.drawer-body {
  flex: 1;
  overflow-y: auto;
  padding: 24px;
}

/* Toggle Drawer Button */
.drawer-toggle-btn {
  position: absolute;
  top: 50%;
  right: -24px;
  transform: translateY(-50%);
  width: 24px;
  height: 48px;
  background-color: white;
  border: 1px solid var(--slate-200);
  border-left: none;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  cursor: pointer;
  z-index: 25;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 4px 0 10px rgba(0,0,0,0.05);
  color: var(--slate-700);
  transition: var(--transition);
}

.drawer-toggle-btn:hover {
  background-color: var(--slate-50);
  color: var(--primary-color);
}

/* ─── FORM & COMPONENT CONTROLS ──────────────────────────── */
.param-group {
  margin-bottom: 24px;
}

.param-group label {
  display: block;
  font-size: 12px;
  font-weight: 800;
  color: var(--slate-700);
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.form-control {
  width: 100%;
  height: 44px;
  background-color: var(--slate-50);
  border: 1px solid var(--slate-200);
  border-radius: var(--radius-md);
  padding: 0 16px;
  font-family: var(--font-main);
  font-size: 14px;
  font-weight: 600;
  color: var(--slate-900);
  transition: var(--transition);
}

.form-control:focus {
  outline: none;
  background-color: white;
  border-color: var(--violet-500);
  box-shadow: 0 0 0 4px rgba(139, 92, 246, 0.12);
}

.param-row {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.checkbox-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(75px, 1fr));
  gap: 12px;
  background-color: var(--slate-50);
  padding: 16px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--slate-200);
  max-height: 200px;
  overflow-y: auto;
}

.checkbox-item {
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  font-size: 13px;
  font-weight: 700;
  user-select: none;
}

.checkbox-item input[type="checkbox"] {
  width: 18px;
  height: 18px;
  accent-color: var(--violet-600);
  cursor: pointer;
}

.checkbox-group {
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  font-size: 13px;
  font-weight: 700;
  user-select: none;
}

.checkbox-group input[type="checkbox"] {
  width: 18px;
  height: 18px;
  accent-color: var(--violet-600);
  cursor: pointer;
}

.checkbox-group label {
  margin-bottom: 0;
  font-size: 13px;
  font-weight: 700;
  color: var(--slate-700);
  cursor: pointer;
  display: inline;
}

/* Accordion */
.accordion {
  border: 1px solid var(--slate-200);
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin-top: 16px;
}

.accordion-trigger {
  width: 100%;
  padding: 16px 20px;
  background-color: var(--slate-50);
  border: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  font-family: var(--font-main);
  font-size: 13px;
  font-weight: 800;
  color: var(--slate-700);
  transition: var(--transition);
}

.accordion-trigger:hover {
  background-color: var(--slate-100);
}

.accordion-trigger i {
  transition: transform 0.25s ease;
}

.accordion.open .accordion-trigger i {
  transform: rotate(180deg);
}

.accordion-content {
  padding: 0 20px;
  max-height: 0;
  overflow: hidden;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  background-color: white;
}

.accordion.open .accordion-content {
  padding: 20px;
  max-height: 800px;
  border-top: 1px solid var(--slate-200);
}

/* ─── MAIN PREVIEW CANVAS WORKSPACE ──────────────────────── */
.app-canvas {
  flex: 1;
  display: flex;
  flex-direction: column;
  height: 100vh;
  position: relative;
}

/* Top Floating Action Bar */
.action-topbar {
  height: 70px;
  background-color: white;
  border-bottom: 1px solid var(--slate-200);
  padding: 0 32px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  z-index: 10;
  box-shadow: 0 2px 10px rgba(0,0,0,0.02);
}

.topbar-title {
  font-size: 16px;
  font-weight: 800;
  color: var(--slate-800);
}

.topbar-actions {
  display: flex;
  gap: 12px;
}

.btn {
  height: 42px;
  padding: 0 20px;
  border-radius: var(--radius-md);
  border: none;
  font-family: var(--font-main);
  font-size: 14px;
  font-weight: 800;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: var(--transition);
}

.btn:active {
  transform: scale(0.97);
}

.btn-primary {
  background: var(--primary-grad);
  color: white;
  box-shadow: var(--shadow-btn);
}

.btn-primary:hover {
  background: var(--violet-700);
}

.btn-success {
  background: var(--success-grad);
  color: white;
  box-shadow: 0 4px 14px rgba(13, 148, 136, 0.15);
}

.btn-success:hover {
  background: var(--teal-700);
}

/* Canvas Sheet container */
.sheet-workspace {
  flex: 1;
  background-color: var(--slate-200);
  overflow: auto;
  padding: 40px;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  position: relative;
}

.preview-wrapper-shadow {
  width: 210mm;
  height: 297mm;
  transform-origin: top center;
  box-shadow: 0 20px 50px rgba(15, 23, 42, 0.12);
  border-radius: 8px;
  background: white;
  transition: transform 0.1s ease-out;
  overflow: hidden;
}

#preview-iframe-wrapper {
  width: 100%;
  height: 100%;
}

#preview-iframe {
  width: 100%;
  height: 100%;
  border: none;
  background: white;
  display: block;
}

/* Floating Zoom & Control HUD */
.floating-hud {
  position: absolute;
  bottom: 24px;
  right: 24px;
  background: white;
  border: 1px solid var(--slate-200);
  border-radius: 30px;
  padding: 6px 12px;
  display: flex;
  align-items: center;
  gap: 12px;
  box-shadow: var(--shadow-lux);
  z-index: 15;
}

.hud-btn {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: none;
  background: var(--slate-100);
  color: var(--slate-800);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  transition: var(--transition);
}

.hud-btn:hover {
  background: var(--slate-200);
  color: var(--slate-900);
}

.hud-text {
  font-size: 12px;
  font-weight: 800;
  color: var(--slate-700);
  min-width: 48px;
  text-align: center;
}