:root {
  --bg: #f5f5f8;
  --card-bg: #ffffff;
  --card-border: #e0e0e8;
  --text: #1a1a2e;
  --text-muted: #8888aa;
  --accent: #5c52e0;
  --accent-hover: #4a42cc;
  --success: #4caf50;
  --error: #d32f2f;
  --radius: 12px;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.container {
  max-width: 820px;
  margin: 0 auto;
  padding: 2rem 1rem;
  flex: 1;
  display: flex;
  flex-direction: column;
}

header {
  text-align: center;
  margin-bottom: 2rem;
  position: relative;
}

header h1 {
  font-size: 2.5rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--accent), #b388ff);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.subtitle {
  color: var(--text-muted);
  margin-top: 0.5rem;
  font-size: 1rem;
}

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

/* Language selector */
.lang-select {
  margin-left: 0.75rem;
  padding: 0.2rem 0.5rem;
  font-size: 0.75rem;
  border: 1px solid var(--card-border);
  border-radius: 6px;
  background: var(--card-bg);
  color: var(--text);
  -webkit-text-fill-color: var(--text);
  cursor: pointer;
  outline: none;
  transition: border-color 0.2s;
  vertical-align: middle;
}

.lang-select:hover,
.lang-select:focus {
  border-color: var(--accent);
}

/* Cards */
.card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin-bottom: 1rem;
}

.card h2 {
  font-size: 1.2rem;
  margin-bottom: 0.5rem;
  color: var(--accent);
}

.views-hint {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
  line-height: 1.4;
}

/* Badges */
.badge-rapid, .badge-pro {
  font-size: 0.7rem;
  padding: 0.15rem 0.5rem;
  border-radius: 6px;
  font-weight: 600;
  vertical-align: middle;
  color: white;
}
.badge-rapid {
  background: #ff9800;
}
.badge-pro {
  background: #2196f3;
}

/* Nav links */
.nav-links {
  margin-top: 0.5rem;
  font-size: 0.85rem;
}
.nav-links a {
  color: var(--accent);
  text-decoration: none;
}
.nav-links a:hover {
  text-decoration: underline;
}

.back-link {
  margin-top: 0.75rem;
  text-align: right;
}

.btn-back {
  display: inline-block;
  padding: 0.5rem 1.2rem;
  background: var(--accent);
  color: white;
  text-decoration: none;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.9rem;
  transition: filter 0.2s;
}

.btn-back:hover {
  filter: brightness(1.1);
}

/* Single view (Rapid mode) */
.single-view {
  display: flex;
  justify-content: center;
  margin-bottom: 1rem;
}
.single-view .view-card {
  max-width: 320px;
  width: 100%;
}

/* View grid — 2x2 layout */
.view-grid, .views-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-bottom: 1rem;
}

.view-card {
  background: #f8f8fc;
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 0.75rem;
}

.view-label {
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.required-badge {
  font-size: 0.7rem;
  background: var(--accent);
  color: white;
  padding: 0.1rem 0.4rem;
  border-radius: 4px;
  font-weight: 500;
}

.optional-badge {
  font-size: 0.7rem;
  background: var(--text-muted);
  color: white;
  padding: 0.1rem 0.4rem;
  border-radius: 4px;
  font-weight: 500;
}

/* View drop zone */
.view-dropzone {
  border: 2px dashed var(--card-border);
  border-radius: 8px;
  padding: 1rem;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
  position: relative;
  min-height: 100px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.view-dropzone:hover,
.view-dropzone.drag-over {
  border-color: var(--accent);
  background: rgba(92, 82, 224, 0.05);
}

.view-dropzone .view-icon {
  font-size: 2rem;
  margin-bottom: 0.3rem;
}

.view-dropzone .drop-text {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* View preview inside drop zone */
.view-preview {
  position: relative;
  width: 100%;
}

.view-preview img {
  max-width: 100%;
  max-height: 120px;
  border-radius: 6px;
  display: block;
  margin: 0 auto;
}

.view-change-btn {
  position: absolute;
  top: 4px;
  right: 4px;
  background: rgba(0,0,0,0.5);
  color: white;
  border: none;
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.7rem;
}

/* Options */
.options {
  margin-top: 0.5rem;
}

.option-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}

.option-row label {
  font-size: 0.9rem;
  min-width: 80px;
}

.name-caption {
  font-size: 1.2rem !important;
  color: var(--accent);
  font-weight: 600;
  min-width: auto !important;
}

#userName {
  flex: 1;
  padding: 0.55rem 0.75rem;
  border: 1px solid var(--card-border);
  border-radius: 8px;
  font-size: 0.95rem;
  font-family: inherit;
  color: var(--text);
  background: var(--card-bg);
  outline: none;
  transition: border-color 0.2s;
}

#userName:focus,
#promptInput:focus {
  border-color: var(--accent);
}

#userName::placeholder,
#promptInput::placeholder {
  color: var(--text-muted);
}

.option-row input[type="range"] {
  flex: 1;
  accent-color: var(--accent);
}

#promptInput {
  flex: 1;
  padding: 0.55rem 0.75rem;
  border: 1px solid var(--card-border);
  border-radius: 8px;
  font-size: 0.95rem;
  font-family: inherit;
  color: var(--text);
  background: var(--card-bg);
  outline: none;
  transition: border-color 0.2s;
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
  min-width: auto !important;
}

.checkbox-label input[type="checkbox"] {
  accent-color: var(--accent);
  width: 18px;
  height: 18px;
}

/* Button */
.btn-reconstruct {
  width: 100%;
  padding: 0.9rem;
  margin-top: 1rem;
  border: none;
  border-radius: var(--radius);
  background: var(--accent);
  color: white;
  font-size: 1.1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s, opacity 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.btn-reconstruct:hover:not(:disabled) {
  background: var(--accent-hover);
}

.btn-reconstruct:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

/* Spinner */
.spinner {
  width: 20px;
  height: 20px;
  border: 3px solid rgba(0,0,0,0.1);
  border-top-color: white;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

/* Result */
.result-info {
  font-size: 0.9rem;
  line-height: 1.6;
  margin-bottom: 1rem;
}

.result-info .stat {
  display: flex;
  justify-content: space-between;
  padding: 0.3rem 0;
  border-bottom: 1px solid var(--card-border);
}

.result-actions {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.action-row {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.action-row--center {
  justify-content: center;
}

.btn-download {
  display: inline-block;
  padding: 0.7rem 1.5rem;
  color: white;
  text-decoration: none;
  border-radius: 8px;
  font-weight: 600;
  transition: filter 0.2s;
  background: var(--success);
}

.btn-download:hover {
  filter: brightness(1.1);
}

.btn-view {
  display: inline-block;
  padding: 0.7rem 1.5rem;
  background: var(--accent);
  color: white;
  text-decoration: none;
  border-radius: 8px;
  font-weight: 600;
  transition: filter 0.2s;
}

.btn-view:hover {
  filter: brightness(1.1);
}

.btn-print {
  display: inline-block;
  padding: 0.7rem 1.5rem;
  background: #ff7043;
  color: white;
  border: none;
  border-radius: 8px;
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  transition: filter 0.2s, opacity 0.2s;
  font-family: inherit;
}

.btn-print:hover:not(:disabled) {
  filter: brightness(1.1);
}

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

.btn-slice {
  display: inline-block;
  padding: 0.7rem 1.5rem;
  background: #7c4dff;
  color: white;
  border: none;
  border-radius: 8px;
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  transition: filter 0.2s, opacity 0.2s;
  font-family: inherit;
}

.btn-slice:hover:not(:disabled) {
  filter: brightness(1.1);
}

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

.btn-details {
  display: inline-block;
  padding: 0.7rem 1.5rem;
  background: #26a69a;
  color: white;
  border: none;
  border-radius: 8px;
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  transition: filter 0.2s, opacity 0.2s;
  font-family: inherit;
}

.btn-details:hover:not(:disabled) {
  filter: brightness(1.1);
}

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


/* Error card */
.error-card {
  border-color: var(--error);
}

.error-card h2 {
  color: var(--error);
}

#errorMessage {
  color: var(--text);
  line-height: 1.5;
}

/* ── Image Enhancement page ───────────────────────────────────────────── */

.enhance-result {
  display: flex;
  gap: 1rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}

.enhance-image-panel {
  flex: 1;
  min-width: 240px;
  background: #f8f8fc;
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  overflow: hidden;
}

.enhance-panel-title {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  padding: 0.5rem 0.75rem;
  background: #f0f0f6;
  border-bottom: 1px solid var(--card-border);
  text-align: center;
}

.enhance-image-panel img {
  display: block;
  width: 100%;
  max-height: 400px;
  object-fit: contain;
  padding: 0.75rem;
  background: #ffffff;
}

@media (max-width: 600px) {
  .enhance-result {
    flex-direction: column;
  }
}

/* Footer */
footer {
  text-align: center;
  padding-top: 2rem;
  color: var(--text-muted);
  font-size: 0.85rem;
}

.status {
  margin-top: 0.3rem;
  font-size: 0.8rem;
}

.status.ok { color: var(--success); }
.status.error { color: var(--error); }
.status.loading { color: var(--text-muted); }

/* ============= Viewer page ============= */
.viewer-container { max-width: 960px; }

.upload-card { padding: 1rem 1.5rem; }

.viewer-upload-row {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.btn-upload {
  display: inline-block;
  padding: 0.65rem 1.2rem;
  background: var(--accent);
  color: white;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  transition: background 0.2s;
  user-select: none;
}

.btn-upload:hover { background: var(--accent-hover); }

.file-name {
  font-size: 0.85rem;
  color: var(--text-muted);
  word-break: break-all;
}

.viewer-hint {
  margin-top: 0.5rem;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.viewer-card { padding: 0; overflow: hidden; }

.viewer-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding: 0.75rem 1rem;
  background: #f0f0f6;
  border-bottom: 1px solid var(--card-border);
}

.tool-btn {
  padding: 0.4rem 0.8rem;
  border: 1px solid var(--card-border);
  border-radius: 6px;
  background: white;
  color: var(--text);
  font-size: 0.8rem;
  cursor: pointer;
  transition: all 0.15s;
  white-space: nowrap;
}

.tool-btn:hover {
  border-color: var(--accent);
  background: #f5f3ff;
}

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

.viewer-canvas-wrapper {
  position: relative;
  width: 100%;
  min-height: 450px;
  background: #1a1a2e;
}

.viewer-canvas-wrapper canvas {
  display: block;
  width: 100% !important;
  height: 100% !important;
}

.viewer-placeholder {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: #8888aa;
  pointer-events: none;
}

.viewer-placeholder .placeholder-icon {
  font-size: 3rem;
  margin-bottom: 0.5rem;
  opacity: 0.5;
}

.viewer-placeholder p {
  font-size: 1rem;
}

.info-card { padding: 1rem 1.5rem; }
.info-card h2 { margin-bottom: 0.75rem; }
.info-card .stat {
  display: flex;
  justify-content: space-between;
  padding: 0.35rem 0;
  border-bottom: 1px solid var(--card-border);
  font-size: 0.9rem;
}

.nav-sep { color: var(--text-muted); margin: 0 0.25rem; }

/* Viewer page responsive */
@media (max-width: 600px) {
  .viewer-canvas-wrapper { min-height: 300px; }
  .viewer-toolbar { justify-content: center; }
  .viewer-upload-row { flex-direction: column; align-items: stretch; }
  .btn-upload { text-align: center; }
}

/* Responsive: single column on small screens */
@media (max-width: 600px) {
  .view-grid, .views-grid {
    grid-template-columns: 1fr;
  }

  .lang-select {
    font-size: 0.7rem;
    padding: 0.15rem 0.4rem;
    margin-left: 0.5rem;
    vertical-align: middle;
  }
}