* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

html, body {
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  overscroll-behavior-y: contain;
}

body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  max-width: 600px;
  margin: 0 auto;
}

/* ============ HEADER ============ */
.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md) var(--space-lg);
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 50;
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.brand-icon {
  width: 36px;
  height: 36px;
  flex-shrink: 0;
}

.brand-text h1 {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 500;
  line-height: 1;
  color: var(--text);
}

.brand-text span {
  font-size: 10px;
  color: var(--text-faint);
  letter-spacing: 1px;
  text-transform: uppercase;
}

.header-nav {
  display: flex;
  gap: var(--space-sm);
}

.header-nav button {
  background: transparent;
  border: 1px solid var(--border-strong);
  color: var(--text);
  width: 36px;
  height: 36px;
  border-radius: var(--radius-pill);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--duration) var(--ease);
}

.header-nav button:hover {
  background: var(--bg-elevated);
  border-color: var(--orange);
  color: var(--orange);
}

/* ============ STEP BAR ============ */
.step-bar {
  height: 3px;
  background: var(--border);
  position: sticky;
  top: 60px;
  z-index: 49;
}

.step-bar-inner {
  height: 100%;
  background: var(--orange);
  width: 20%;
  transition: width 400ms var(--ease);
}

/* ============ MAIN ============ */
.app-main {
  flex: 1;
  padding: var(--space-xl) var(--space-lg);
}

.screen {
  animation: fadeIn 300ms var(--ease);
}

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

.screen-header {
  margin-bottom: var(--space-xl);
}

.screen-header.center {
  text-align: center;
}

.step-label {
  display: inline-block;
  font-size: 11px;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--text-faint);
  margin-bottom: var(--space-sm);
}

.screen-header h2 {
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 500;
  line-height: 1.2;
  margin-bottom: var(--space-sm);
  color: var(--text);
}

.screen-header p {
  color: var(--text-muted);
  font-size: 15px;
}

/* ============ DROPZONE ============ */
.dropzone {
  display: block;
  border: 2px dashed var(--border-strong);
  border-radius: var(--radius-md);
  padding: var(--space-2xl) var(--space-lg);
  text-align: center;
  cursor: pointer;
  background: var(--bg-elevated);
  transition: all var(--duration) var(--ease);
}

.dropzone:hover, .dropzone.drag-over {
  border-color: var(--orange);
  background: var(--orange-soft);
}

.dropzone-icon {
  width: 56px;
  height: 56px;
  background: var(--orange);
  color: var(--bg);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--space-md);
}

.dropzone-title {
  font-size: 16px;
  font-weight: 500;
  margin-bottom: var(--space-xs);
  color: var(--text);
}

.dropzone-hint {
  font-size: 12px;
  color: var(--text-muted);
}

.counter {
  text-align: center;
  font-size: 13px;
  color: var(--text-muted);
  margin-top: var(--space-md);
}

/* ============ PHOTOS GRID ============ */
.photos-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-sm);
  margin-top: var(--space-lg);
}

.photo-thumb {
  position: relative;
  aspect-ratio: 1;
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
}

.photo-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.photo-thumb .remove-btn {
  position: absolute;
  top: 4px;
  right: 4px;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: rgba(0, 0, 0, 0.7);
  color: white;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  line-height: 1;
}

/* ============ TABS ============ */
.tab-switch {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
}

.tab-btn {
  background: transparent;
  border: 1px solid var(--border-strong);
  color: var(--text);
  padding: 14px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-family: inherit;
  cursor: pointer;
  transition: all var(--duration) var(--ease);
}

.tab-btn.active {
  background: var(--orange);
  color: var(--bg);
  border-color: var(--orange);
  font-weight: 500;
}

/* ============ LOGO UPLOAD ============ */
.logo-upload {
  display: block;
  cursor: pointer;
}

.logo-upload-empty {
  background: var(--bg-elevated);
  border: 1px dashed var(--border-strong);
  border-radius: var(--radius-md);
  padding: var(--space-xl);
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
  color: var(--text-muted);
}

.logo-controls {
  background: var(--bg-elevated);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
}

.logo-preview-row {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-bottom: var(--space-md);
}

.logo-preview-box {
  width: 56px;
  height: 56px;
  background: var(--bg-input);
  border-radius: var(--radius-sm);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  background-image: linear-gradient(45deg, var(--border) 25%, transparent 25%, transparent 75%, var(--border) 75%), linear-gradient(45deg, var(--border) 25%, transparent 25%, transparent 75%, var(--border) 75%);
  background-size: 12px 12px;
  background-position: 0 0, 6px 6px;
}

.logo-preview-box img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.logo-info {
  flex: 1;
  min-width: 0;
}

.logo-filename {
  font-size: 13px;
  color: var(--text-muted);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  margin-bottom: var(--space-xs);
}

.btn-bg-remove {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
}

.limit-counter {
  text-align: center;
  font-size: 11px;
  color: var(--text-faint);
  margin-top: var(--space-sm);
}

/* ============ FORM ============ */
.text-input, .form-group select, .form-group input[type="text"] {
  width: 100%;
  background: var(--bg-elevated);
  border: 1px solid var(--border-strong);
  color: var(--text);
  padding: 14px var(--space-md);
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-family: inherit;
  margin-bottom: var(--space-md);
}

.text-input:focus, select:focus {
  outline: none;
  border-color: var(--orange);
}

.form-group {
  margin-bottom: var(--space-md);
}

.form-group label {
  display: block;
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: var(--space-xs);
}

input[type="color"] {
  width: 60px;
  height: 36px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  cursor: pointer;
  background: transparent;
}

input[type="range"] {
  width: 100%;
  -webkit-appearance: none;
  height: 4px;
  background: var(--border-strong);
  border-radius: 2px;
  outline: none;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 20px;
  height: 20px;
  background: var(--orange);
  border-radius: 50%;
  cursor: pointer;
}

input[type="range"]::-moz-range-thumb {
  width: 20px;
  height: 20px;
  background: var(--orange);
  border-radius: 50%;
  cursor: pointer;
  border: none;
}

/* ============ BUTTONS ============ */
.btn-primary {
  background: var(--orange);
  color: var(--bg);
  border: none;
  padding: 14px var(--space-lg);
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 500;
  font-family: inherit;
  cursor: pointer;
  transition: all var(--duration) var(--ease);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
}

.btn-primary:hover:not(:disabled) {
  background: var(--orange-dark);
}

.btn-primary:disabled {
  background: var(--border-strong);
  color: var(--text-faint);
  cursor: not-allowed;
}

.btn-primary.btn-large {
  width: 100%;
  padding: 16px;
  font-size: 16px;
  margin-bottom: var(--space-sm);
}

.btn-secondary {
  background: var(--orange-soft);
  color: var(--orange);
  border: 1px solid var(--orange);
  padding: 12px var(--space-lg);
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 500;
  font-family: inherit;
  cursor: pointer;
}

.btn-ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border-strong);
  padding: 12px var(--space-lg);
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-family: inherit;
  cursor: pointer;
  width: 100%;
}

.btn-ghost:hover {
  background: var(--bg-elevated);
}

.btn-link {
  background: transparent;
  color: var(--orange);
  border: 1px solid var(--orange);
  padding: 6px var(--space-md);
  border-radius: var(--radius-sm);
  font-size: 12px;
  font-family: inherit;
  cursor: pointer;
}

.screen-actions {
  display: flex;
  gap: var(--space-sm);
  margin-top: var(--space-xl);
}

.screen-actions .btn-primary {
  flex: 1;
}

.screen-actions .btn-ghost {
  width: auto;
  flex: 0 0 auto;
}

/* ============ CANVAS ============ */
.canvas-wrap {
  position: relative;
  background: var(--bg-elevated);
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-bottom: var(--space-md);
  aspect-ratio: 4/5;
}

#position-canvas {
  width: 100%;
  height: 100%;
  display: block;
  touch-action: none;
}

.canvas-counter {
  position: absolute;
  top: var(--space-sm);
  left: var(--space-sm);
  background: rgba(13, 10, 8, 0.8);
  color: var(--text);
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  font-size: 11px;
}

.thumbs-strip {
  display: flex;
  gap: var(--space-sm);
  overflow-x: auto;
  padding: var(--space-sm) 0;
  margin-bottom: var(--space-md);
}

.thumbs-strip::-webkit-scrollbar {
  height: 4px;
}

.thumbs-strip::-webkit-scrollbar-thumb {
  background: var(--border-strong);
  border-radius: 2px;
}

.thumbs-strip .thumb {
  min-width: 56px;
  width: 56px;
  height: 56px;
  border-radius: var(--radius-sm);
  border: 2px solid transparent;
  cursor: pointer;
  flex-shrink: 0;
  position: relative;
  overflow: hidden;
}

.thumbs-strip .thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.thumbs-strip .thumb.active {
  border-color: var(--orange);
}

.thumbs-strip .thumb.has-override::after {
  content: '';
  position: absolute;
  top: 4px;
  right: 4px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--orange);
}

/* ============ ADVANCED PANEL ============ */
.advanced-panel {
  background: var(--bg-elevated);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-md);
  overflow: hidden;
}

.advanced-panel summary {
  padding: var(--space-md);
  cursor: pointer;
  font-size: 14px;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  color: var(--orange);
  list-style: none;
}

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

.advanced-content {
  padding: 0 var(--space-md) var(--space-md);
  border-top: 1px solid var(--border);
  padding-top: var(--space-md);
}

.advanced-content .hint {
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: var(--space-md);
  line-height: 1.5;
}

.advanced-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-xs);
  margin-bottom: var(--space-md);
}

.advanced-grid .check-thumb {
  position: relative;
  aspect-ratio: 1;
  border-radius: var(--radius-sm);
  overflow: hidden;
  border: 2px solid transparent;
  cursor: pointer;
}

.advanced-grid .check-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.advanced-grid .check-thumb.checked {
  border-color: var(--success);
}

.advanced-grid .check-thumb.checked::after {
  content: '✓';
  position: absolute;
  top: 4px;
  right: 4px;
  width: 18px;
  height: 18px;
  background: var(--success);
  color: white;
  border-radius: 50%;
  font-size: 11px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
}

.row-controls {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-bottom: var(--space-md);
}

.row-controls label {
  font-size: 13px;
  color: var(--text-muted);
  flex: 0 0 80px;
}

.row-controls input[type="range"] {
  flex: 1;
}

.row-controls span {
  font-size: 13px;
  color: var(--text);
  font-weight: 500;
  min-width: 40px;
  text-align: right;
}

/* ============ INFO TIPS ============ */
.info-tip {
  background: var(--bg-elevated);
  border-radius: var(--radius-sm);
  padding: var(--space-md);
  font-size: 12px;
  color: var(--text-muted);
  line-height: 1.5;
  margin-top: var(--space-md);
}

.info-tip strong {
  color: var(--text);
}

.info-tip-small {
  font-size: 11px;
  color: var(--text-faint);
  text-align: center;
  margin-top: var(--space-sm);
}

/* ============ PROCESSING ============ */
.processing-card {
  background: var(--bg-elevated);
  border-radius: var(--radius-md);
  padding: var(--space-2xl) var(--space-lg);
  text-align: center;
  margin-bottom: var(--space-lg);
}

.processing-thumb {
  width: 80px;
  height: 80px;
  margin: 0 auto var(--space-md);
  background: var(--bg-input);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.processing-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.processing-label {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: var(--space-xs);
}

.processing-count {
  font-size: 20px;
  font-weight: 500;
  color: var(--text);
  margin-bottom: var(--space-md);
}

.progress-bar {
  background: var(--bg-input);
  height: 6px;
  border-radius: 3px;
  overflow: hidden;
  margin-bottom: var(--space-sm);
}

.progress-fill {
  background: var(--orange);
  height: 100%;
  width: 0%;
  border-radius: 3px;
  transition: width 300ms var(--ease);
}

.progress-percent {
  font-size: 12px;
  color: var(--text-faint);
}

.dots-row {
  display: flex;
  gap: var(--space-xs);
  margin-bottom: var(--space-md);
}

.dots-row .dot {
  flex: 1;
  height: 4px;
  background: var(--bg-input);
  border-radius: 2px;
  transition: background 200ms var(--ease);
}

.dots-row .dot.done {
  background: var(--orange);
}

/* ============ DOWNLOAD ============ */
.success-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto var(--space-md);
  background: var(--orange);
  color: var(--bg);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  animation: pop 400ms var(--ease);
}

@keyframes pop {
  0% { transform: scale(0); }
  60% { transform: scale(1.1); }
  100% { transform: scale(1); }
}

.result-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xs);
  margin-bottom: var(--space-lg);
}

.result-grid .result-thumb {
  aspect-ratio: 1;
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: var(--bg-elevated);
}

.result-grid .result-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ============ FOOTER ============ */
.app-footer {
  padding: var(--space-lg);
  text-align: center;
  font-size: 12px;
  color: var(--text-faint);
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
}

.app-footer a {
  color: var(--text-muted);
  text-decoration: none;
}

.app-footer a:hover {
  color: var(--orange);
}

/* ============ TOAST ============ */
.toast {
  position: fixed;
  bottom: 80px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--bg-card);
  color: var(--text);
  padding: var(--space-md) var(--space-lg);
  border-radius: var(--radius-pill);
  border: 1px solid var(--border-strong);
  font-size: 14px;
  z-index: 100;
  animation: slideUp 300ms var(--ease);
  max-width: 90%;
}

.toast.error {
  border-color: var(--danger);
  color: var(--danger);
}

@keyframes slideUp {
  from { transform: translate(-50%, 20px); opacity: 0; }
  to { transform: translate(-50%, 0); opacity: 1; }
}

/* ============ RESPONSIVE ============ */
@media (min-width: 480px) {
  .photos-grid {
    grid-template-columns: repeat(5, 1fr);
  }
  .advanced-grid {
    grid-template-columns: repeat(5, 1fr);
  }
}

/* ============ FORMATO DO LOGO ============ */
.format-btns {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}
.format-btn {
  background: var(--bg-elevated);
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px 8px;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  color: var(--text-muted);
  transition: all var(--duration) var(--ease);
}
.format-btn.active {
  border-color: var(--orange);
  color: var(--orange);
  background: var(--orange-soft);
}
.format-preview {
  width: 36px;
  height: 36px;
  background: var(--border-strong);
}
.format-original { border-radius: 4px; width: 40px; height: 28px; }
.format-square { border-radius: 4px; }
.format-circle { border-radius: 50%; }

/* ============ SWATCHES DE COR ============ */
.color-swatches {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}
.swatch {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  border: 2px solid transparent;
  cursor: pointer;
  transition: transform 150ms ease;
  flex-shrink: 0;
}
.swatch:hover { transform: scale(1.15); }
.swatch.active {
  border-color: var(--orange);
  box-shadow: 0 0 0 2px var(--bg), 0 0 0 4px var(--orange);
}
.swatch-more {
  background: var(--bg-elevated);
  border: 1px solid var(--border-strong);
  color: var(--text);
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  font-size: 12px;
  cursor: pointer;
  height: 30px;
}

/* ============ TOGGLE SWITCH ============ */
.toggle-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 4px;
}
.toggle-row label:first-child {
  font-size: 14px;
  color: var(--text);
}
.toggle-switch {
  position: relative;
  display: inline-block;
  width: 44px;
  height: 24px;
  cursor: pointer;
}
.toggle-switch input { opacity: 0; width: 0; height: 0; }
.toggle-slider {
  position: absolute;
  inset: 0;
  background: var(--border-strong);
  border-radius: 24px;
  transition: background 200ms ease;
}
.toggle-slider::before {
  content: '';
  position: absolute;
  width: 18px;
  height: 18px;
  left: 3px;
  top: 3px;
  background: white;
  border-radius: 50%;
  transition: transform 200ms ease;
}
.toggle-switch input:checked + .toggle-slider { background: var(--orange); }
.toggle-switch input:checked + .toggle-slider::before { transform: translateX(20px); }

/* ============ MODO INDIVIDUAL (ecrã 3) ============ */
.mode-indicator {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  background: var(--bg-input);
  border-radius: var(--radius-sm);
  margin-bottom: 12px;
  font-size: 13px;
  color: var(--text-muted);
}
.mode-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--border-strong);
  flex-shrink: 0;
}
.mode-dot.individual { background: var(--orange); }

/* ============ DOWNLOAD ============ */
.download-section {
  margin-bottom: var(--space-md);
}
.download-progress {
  margin-top: 12px;
}

/* ============ SUPORTE FAB ============ */
.support-fab {
  position: fixed;
  bottom: 24px;
  right: 20px;
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: var(--orange);
  color: var(--bg);
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 20px rgba(255,140,66,0.4);
  z-index: 90;
  transition: transform 150ms ease, box-shadow 150ms ease;
}
.support-fab:hover {
  transform: scale(1.08);
  box-shadow: 0 6px 28px rgba(255,140,66,0.5);
}
.support-fab:active { transform: scale(0.95); }

/* ============ MODAL ============ */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.8);
  z-index: 500;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding: 0;
  animation: fadeIn 200ms ease;
}
.modal-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  padding: var(--space-xl);
  width: 100%;
  max-width: 600px;
  max-height: 90vh;
  overflow-y: auto;
  animation: slideUpModal 300ms cubic-bezier(0.4,0,0.2,1);
}
@keyframes slideUpModal {
  from { transform: translateY(100%); }
  to { transform: translateY(0); }
}
.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
}
.modal-header h3 {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 500;
  color: var(--text);
}
.modal-close {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 18px;
  cursor: pointer;
  padding: 4px 8px;
}
.modal-subtitle {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 20px;
  line-height: 1.5;
}
.support-input {
  width: 100%;
  background: var(--bg-elevated);
  border: 1px solid var(--border-strong);
  color: var(--text);
  padding: 12px var(--space-md);
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-family: inherit;
  resize: vertical;
}
.support-input:focus {
  outline: none;
  border-color: var(--orange);
}
.support-alt {
  text-align: center;
  font-size: 13px;
  color: var(--text-faint);
  margin-top: 14px;
}
.support-alt a {
  color: var(--orange);
  text-decoration: none;
}