/* ============================================
   BannerStudio — Design Tool for Bannere
   ============================================ */

/* Design Tokens */
:root {
  /* Type Scale */
  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --text-sm: clamp(0.875rem, 0.8rem + 0.35vw, 1rem);
  --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --text-lg: clamp(1.125rem, 1rem + 0.75vw, 1.5rem);
  --text-xl: clamp(1.5rem, 1.2rem + 1.25vw, 2.25rem);

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;

  /* Radii */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;

  /* Transition */
  --transition: 180ms cubic-bezier(0.16, 1, 0.3, 1);

  /* Fonts */
  --font-display: 'Cabinet Grotesk', 'Inter', sans-serif;
  --font-body: 'Satoshi', 'Inter', sans-serif;

  /* Force light mode — no dark theme */
  color-scheme: light only;
}

/* Light Theme (always active) */
:root {
  --color-bg: #f5f5f7;
  --color-surface: #ffffff;
  --color-surface-2: #fafafa;
  --color-surface-offset: #f0f0f3;
  --color-border: #e2e2e8;
  --color-divider: #ededf0;
  --color-text: #1a1a2e;
  --color-text-muted: #6b6b80;
  --color-text-faint: #a0a0b0;
  --color-primary: #6c5ce7;
  --color-primary-hover: #5b4bd5;
  --color-primary-light: #f0edff;
  --color-danger: #e63946;
  --color-danger-light: #ffeaea;
  --color-success: #2d6a4f;

  --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.06);
  --shadow-lg: 0 12px 32px rgba(0,0,0,0.1);
}

/* Reset */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  -webkit-text-size-adjust: none;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  min-height: 100dvh;
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text);
  background: var(--color-bg);
  overflow: hidden;
}

/* App Layout */
.app {
  display: flex;
  flex-direction: column;
  height: 100dvh;
  width: 100%;
}

/* Header */
.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) var(--space-4);
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  gap: var(--space-4);
  min-height: 60px;
  z-index: 100;
}

.header-left { flex-shrink: 0; }

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--text-lg);
  color: var(--color-text);
  letter-spacing: -0.02em;
}

.logo svg { color: var(--color-primary); }

.logo-rb {
  width: 32px;
  height: 32px;
  object-fit: contain;
}

/* Step Navigation */
.step-nav {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  flex: 1;
  justify-content: center;
  max-width: 600px;
}

.step-btn {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  cursor: pointer;
  background: transparent;
  border: none;
  color: var(--color-text-muted);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 500;
  transition: all var(--transition);
  white-space: nowrap;
}

.step-btn:hover {
  background: var(--color-surface-offset);
  color: var(--color-text);
}

.step-btn.active {
  background: var(--color-primary-light);
  color: var(--color-primary);
}

.step-btn.completed .step-num {
  background: var(--color-primary);
  color: white;
}

.step-num {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  border-radius: var(--radius-full);
  background: var(--color-surface-offset);
  font-size: var(--text-xs);
  font-weight: 700;
  flex-shrink: 0;
  transition: all var(--transition);
}

.step-btn.active .step-num {
  background: var(--color-primary);
  color: white;
}

.step-connector {
  width: 20px;
  height: 2px;
  background: var(--color-border);
  flex-shrink: 0;
}

.header-right { flex-shrink: 0; }

.header-badge {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  padding: var(--space-1) var(--space-3);
  background: var(--color-surface-offset);
  border-radius: var(--radius-full);
  font-weight: 500;
}

/* Main Layout */
.main {
  display: flex;
  flex: 1;
  overflow: hidden;
}

/* Sidebar */
.sidebar {
  width: 360px;
  flex-shrink: 0;
  background: var(--color-surface);
  border-right: 1px solid var(--color-border);
  overflow-y: auto;
  padding: var(--space-6) var(--space-5);
}

.panel {
  display: none;
  flex-direction: column;
  gap: var(--space-4);
  animation: fadeIn 0.3s ease;
}

.panel.active { display: flex; }

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.panel-title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.01em;
}

.panel-desc {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.5;
}

/* Form Elements */
.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.form-group label {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text);
}

input[type="number"],
input[type="text"],
select {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: var(--text-base);
  transition: all var(--transition);
  -webkit-appearance: none;
  appearance: none;
}

input[type="number"]:focus,
input[type="text"]:focus,
select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-light);
}

select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%236b6b80' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 1rem center;
  padding-right: 2.5rem;
}

.hint {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  line-height: 1.4;
}

.bg-hint {
  background: var(--color-primary-light);
  color: var(--color-primary);
  padding: var(--space-3);
  border-radius: var(--radius-md);
  font-size: var(--text-xs);
  line-height: 1.5;
}

/* Preset Buttons */
.preset-row {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.preset-btn {
  padding: var(--space-2) var(--space-3);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  color: var(--color-text-muted);
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
}

.preset-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: var(--color-primary-light);
}

/* Material Selector */
.material-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin-top: var(--space-4);
}

.panel-label {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-1);
}

.material-card {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition);
  background: var(--color-surface);
}

.material-card:hover {
  border-color: var(--color-text-faint);
}

.material-card input[type="radio"] {
  margin-top: 3px;
  accent-color: var(--color-primary);
  flex-shrink: 0;
}

.material-card:has(input:checked) {
  border-color: var(--color-primary);
  background: var(--color-primary-light);
}

.material-card-content {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.material-card-title {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
}

.material-card-desc {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  line-height: 1.4;
}

.hint-contact {
  margin-top: var(--space-3);
  text-align: center;
}

.hint-contact a {
  color: var(--color-primary);
  text-decoration: none;
  font-weight: 500;
}

.hint-contact a:hover {
  text-decoration: underline;
}

/* Quality Info Box */
.quality-info-box {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding: var(--space-4);
  background: var(--color-surface-offset);
  border-radius: var(--radius-md);
}

.info-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.info-label {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.info-value {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
  font-variant-numeric: tabular-nums;
}

/* Radio Cards */
.radio-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.radio-card {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-4);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition);
}

.radio-card:hover {
  border-color: var(--color-primary);
  background: var(--color-primary-light);
}

.radio-card input[type="radio"] {
  margin-top: 2px;
  accent-color: var(--color-primary);
  width: 18px;
  height: 18px;
  cursor: pointer;
  flex-shrink: 0;
}

.radio-card:has(input:checked) {
  border-color: var(--color-primary);
  background: var(--color-primary-light);
}

.radio-card-title {
  display: block;
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
}

.radio-card-desc {
  display: block;
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-top: 2px;
}

/* Background Sections */
.bg-section {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.bg-section.hidden { display: none; }

.color-row {
  display: flex;
  gap: var(--space-2);
  align-items: center;
}

input[type="color"] {
  width: 52px;
  height: 44px;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  background: var(--color-surface);
  padding: 4px;
  flex-shrink: 0;
}

input[type="color"]::-webkit-color-swatch-wrapper { padding: 0; }
input[type="color"]::-webkit-color-swatch {
  border: none;
  border-radius: var(--radius-sm);
}

.color-text-input {
  flex: 1;
  text-transform: uppercase;
  font-family: monospace;
  letter-spacing: 0.05em;
}

.color-presets {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.color-preset {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  border: 2px solid var(--color-border);
  cursor: pointer;
  transition: all var(--transition);
  padding: 0;
}

.color-preset:hover {
  transform: scale(1.1);
  border-color: var(--color-primary);
}

/* Color Picker Box (step 2) */
.color-picker-box {
  position: relative;
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition);
  background: var(--color-surface);
  margin-bottom: var(--space-2);
}

.color-picker-box:hover {
  border-color: var(--color-primary);
  background: var(--color-primary-light);
}

.color-picker-box input[type="color"] {
  width: 64px;
  height: 64px;
  border-radius: var(--radius-md);
  flex-shrink: 0;
}

.color-picker-info {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.color-picker-swatch {
  width: 100%;
  height: 28px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
}

.color-picker-text {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  font-weight: 500;
}

.hint-color {
  margin-top: var(--space-3);
  margin-bottom: var(--space-2);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

/* Upload Zone */
.upload-zone {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-8);
  border: 2px dashed var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-surface-2);
  cursor: pointer;
  transition: all var(--transition);
  text-align: center;
}

.upload-zone:hover,
.upload-zone.dragover {
  border-color: var(--color-primary);
  background: var(--color-primary-light);
}

.upload-zone-sm { padding: var(--space-6); }

.upload-zone-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-text-muted);
}

.upload-zone-content p {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text);
}

.upload-zone-content span { font-size: var(--text-xs); }

/* BG Preview */
.bg-preview {
  width: 100%;
  height: 80px;
  border-radius: var(--radius-md);
  background-size: cover;
  background-position: center;
  background-color: var(--color-surface-offset);
  border: 1.5px solid var(--color-border);
}

/* Range Sliders */
input[type="range"] {
  width: 100%;
  height: 6px;
  border-radius: var(--radius-full);
  background: var(--color-surface-offset);
  -webkit-appearance: none;
  appearance: none;
  cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 20px;
  height: 20px;
  border-radius: var(--radius-full);
  background: var(--color-primary);
  cursor: pointer;
  border: 3px solid var(--color-surface);
  box-shadow: var(--shadow-sm);
}

input[type="range"]::-moz-range-thumb {
  width: 20px;
  height: 20px;
  border-radius: var(--radius-full);
  background: var(--color-primary);
  cursor: pointer;
  border: 3px solid var(--color-surface);
  box-shadow: var(--shadow-sm);
}

/* Layer List */
.layer-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  max-height: 300px;
  overflow-y: auto;
}

.empty-state {
  text-align: center;
  padding: var(--space-6);
  color: var(--color-text-faint);
  font-size: var(--text-sm);
}

.layer-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  background: var(--color-surface-2);
  cursor: pointer;
  transition: all var(--transition);
  border: 1.5px solid transparent;
}

.layer-item:hover { background: var(--color-surface-offset); }

.layer-item.active {
  border-color: var(--color-primary);
  background: var(--color-primary-light);
}

.layer-thumb {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: var(--color-surface-offset);
  background-size: cover;
  background-position: center;
  flex-shrink: 0;
  border: 1px solid var(--color-border);
}

.layer-name {
  flex: 1;
  font-size: var(--text-sm);
  color: var(--color-text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.layer-delete {
  background: none;
  border: none;
  color: var(--color-text-faint);
  cursor: pointer;
  padding: var(--space-1);
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}

.layer-delete:hover {
  color: var(--color-danger);
  background: var(--color-danger-light);
}

/* Toolbar */
.toolbar {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-2);
  background: var(--color-surface-2);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
}

.tool-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: transparent;
  border: none;
  cursor: pointer;
  color: var(--color-text-muted);
  transition: all var(--transition);
}

.tool-btn:hover {
  background: var(--color-surface-offset);
  color: var(--color-text);
}

.tool-btn-danger:hover {
  background: var(--color-danger-light);
  color: var(--color-danger);
}

.tool-divider {
  width: 1px;
  height: 20px;
  background: var(--color-border);
  margin: 0 var(--space-1);
}

/* Text & Shapes Panel */
.text-tools-section {
  margin-bottom: var(--space-4);
}

.shape-row {
  display: flex;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}

.shape-btn {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-3);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  color: var(--color-text-muted);
  cursor: pointer;
  transition: all var(--transition);
}

.shape-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: var(--color-primary-light);
}

.text-properties,
.shape-properties {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  padding: var(--space-4);
  background: var(--color-surface-offset);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-4);
}

.text-properties.hidden,
.shape-properties.hidden {
  display: none;
}

.form-row-pair {
  display: flex;
  gap: var(--space-3);
}

.form-row-pair .form-group {
  flex: 1;
}

.color-input-sm {
  width: 100%;
  height: 38px;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  padding: 2px;
  background: var(--color-surface);
}

.style-btn-row {
  display: flex;
  gap: var(--space-1);
}

.style-btn {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 36px;
  height: 38px;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  color: var(--color-text);
  cursor: pointer;
  font-size: var(--text-sm);
  transition: all var(--transition);
}

.style-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.style-btn.active {
  border-color: var(--color-primary);
  background: var(--color-primary-light);
  color: var(--color-primary);
}

.range-value {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-left: var(--space-2);
}

textarea {
  width: 100%;
  padding: var(--space-3);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  resize: vertical;
  background: var(--color-surface);
  color: var(--color-text);
}

textarea:focus {
  outline: none;
  border-color: var(--color-primary);
}

select {
  width: 100%;
  padding: var(--space-3);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  background: var(--color-surface);
  color: var(--color-text);
  cursor: pointer;
}

select:focus {
  outline: none;
  border-color: var(--color-primary);
}

.btn-sm {
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-xs);
}

/* Panel Navigation */
.panel-nav {
  display: flex;
  justify-content: space-between;
  gap: var(--space-3);
  margin-top: var(--space-2);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  border-radius: var(--radius-md);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 500;
  cursor: pointer;
  border: none;
  transition: all var(--transition);
  white-space: nowrap;
}

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

.btn-primary:hover {
  background: var(--color-primary-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-ghost {
  background: transparent;
  color: var(--color-text-muted);
  border: 1.5px solid var(--color-border);
}

.btn-ghost:hover {
  background: var(--color-surface-offset);
  color: var(--color-text);
}

.btn-sm {
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-xs);
}

.btn-full { width: 100%; }

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* Canvas Area — with striped background */
.canvas-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background-color: #e0e0e6;
  background-image: repeating-linear-gradient(
    45deg,
    transparent,
    transparent 12px,
    rgba(0, 0, 0, 0.035) 12px,
    rgba(0, 0, 0, 0.035) 24px,
    transparent 24px,
    transparent 36px,
    rgba(0, 0, 0, 0.07) 36px,
    rgba(0, 0, 0, 0.07) 48px
  );
  overflow: hidden;
  padding: var(--space-6);
  position: relative;
}

.canvas-wrapper {
  display: flex;
  align-items: center;
  justify-content: center;
  max-width: 100%;
  max-height: 100%;
  box-shadow: var(--shadow-lg);
  border-radius: 4px;
  overflow: hidden;
  background: var(--color-surface);
}

.canvas-wrapper canvas {
  display: block;
  max-width: 100%;
  max-height: 100%;
}

.canvas-info {
  position: absolute;
  bottom: var(--space-4);
  left: 50%;
  transform: translateX(-50%);
  padding: var(--space-2) var(--space-4);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  box-shadow: var(--shadow-sm);
  font-variant-numeric: tabular-nums;
}

/* Export Info */
.export-info {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding: var(--space-4);
  background: var(--color-surface-offset);
  border-radius: var(--radius-md);
}

.export-warning {
  padding: var(--space-3) var(--space-4);
  background: var(--color-primary-light);
  border-radius: var(--radius-md);
  font-size: var(--text-xs);
  color: var(--color-primary);
  text-align: center;
}

/* Toast */
.toast {
  position: fixed;
  bottom: var(--space-8);
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  padding: var(--space-3) var(--space-5);
  background: var(--color-text);
  color: var(--color-surface);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-weight: 500;
  box-shadow: var(--shadow-lg);
  z-index: 1000;
  opacity: 0;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  pointer-events: none;
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* Export Overlay */
.export-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 2000;
  backdrop-filter: blur(4px);
}

.export-overlay.active { display: flex; }

.export-overlay-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-8);
  background: var(--color-surface);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
}

.export-overlay-content p {
  font-size: var(--text-sm);
  color: var(--color-text);
}

.spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--color-surface-offset);
  border-top-color: var(--color-primary);
  border-radius: var(--radius-full);
  animation: spin 0.8s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

/* Mobile Nav */
.mobile-nav {
  display: none;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-2) var(--space-4);
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  min-height: 50px;
}

.mobile-nav-btn {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  background: var(--color-primary);
  color: white;
  border: none;
  cursor: pointer;
  font-size: var(--text-base);
}

.mobile-nav-btn:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

.mobile-nav-info {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.hidden { display: none !important; }

/* Responsive */
@media (max-width: 1024px) {
  .step-nav { max-width: 400px; }
  .step-label { display: none; }
  .step-btn { padding: var(--space-2); }
  .sidebar {
    width: 320px;
    padding: var(--space-4) var(--space-4);
  }
}

@media (max-width: 768px) {
  .header { padding: var(--space-2) var(--space-3); min-height: 50px; }
  .logo span { display: none; }
  .step-nav { gap: 0; }
  .step-connector { width: 12px; }
  .main { flex-direction: column-reverse; }
  .sidebar {
    width: 100%;
    border-right: none;
    border-top: 1px solid var(--color-border);
    max-height: 45vh;
    padding: var(--space-4) var(--space-3);
  }
  .canvas-area { padding: var(--space-3); flex: 1; min-height: 0; }
  .mobile-nav { display: flex; }
  .panel-nav { margin-bottom: var(--space-2); }
}

@media (max-width: 480px) {
  .step-btn .step-num { width: 20px; height: 20px; font-size: 10px; }
  .step-connector { width: 8px; }
  .preset-btn { font-size: 11px; padding: var(--space-1) var(--space-2); }
}

/* Scrollbar */
.sidebar::-webkit-scrollbar,
.layer-list::-webkit-scrollbar { width: 6px; }
.sidebar::-webkit-scrollbar-track,
.layer-list::-webkit-scrollbar-track { background: transparent; }
.sidebar::-webkit-scrollbar-thumb,
.layer-list::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: var(--radius-full);
}
.sidebar::-webkit-scrollbar-thumb:hover,
.layer-list::-webkit-scrollbar-thumb:hover {
  background: var(--color-text-faint);
}