:root {
  --bg: #f1f5f9;
  --surface: #ffffff;
  --surface-alt: #f8fafc;
  --border: #e2e8f0;
  --border-strong: #cbd5e1;
  --text: #0f172a;
  --text-muted: #475569;
  --text-subtle: #64748b;
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-soft: #eff6ff;
  --accent: #059669;
  --accent-soft: #ecfdf5;
  --pro: #7c3aed;
  --pro-hover: #6d28d9;
  --pro-soft: #f5f3ff;
  --warn: #d97706;
  --radius: 14px;
  --radius-sm: 9px;
  --shadow: 0 4px 20px rgba(15, 23, 42, 0.06);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

.topbar {
  background: #0f172a;
  color: #f8fafc;
  border-bottom: 1px solid #1e293b;
  position: sticky;
  top: 0;
  z-index: 40;
}

.topbar-inner {
  max-width: 1320px;
  margin: 0 auto;
  padding: 11px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.brand-group {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.brand-home {
  color: #94a3b8;
  text-decoration: none;
  font-size: 13px;
  font-weight: 500;
  padding: 4px 9px;
  border-radius: 6px;
  border: 1px solid #334155;
  transition: all 0.15s;
}

.brand-home:hover {
  color: #ffffff;
  border-color: #64748b;
}

.app-title-wrap {
  display: flex;
  align-items: center;
  gap: 8px;
}

.app-badge-icon {
  width: 30px;
  height: 30px;
  border-radius: 8px;
  background: linear-gradient(135deg, #3b82f6, #6366f1);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
}

.app-title {
  font-size: 16px;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.privacy-pill {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 11.5px;
  font-weight: 600;
  color: #34d399;
  background: rgba(16, 185, 129, 0.14);
  border: 1px solid rgba(52, 211, 153, 0.3);
  padding: 3px 9px;
  border-radius: 999px;
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.nav-link-chip {
  color: #cbd5e1;
  text-decoration: none;
  font-size: 12.5px;
  padding: 6px 10px;
  border-radius: 7px;
  transition: background 0.15s;
}

.nav-link-chip:hover {
  background: #1e293b;
  color: #ffffff;
}

.lang-btn {
  background: #1e293b;
  color: #f8fafc;
  border: 1px solid #334155;
  padding: 6px 11px;
  border-radius: 7px;
  font-size: 12.5px;
  font-weight: 600;
  cursor: pointer;
}

.lang-btn:hover {
  background: #334155;
}

.pro-status-btn {
  background: linear-gradient(135deg, #7c3aed, #2563eb);
  color: #ffffff;
  border: none;
  padding: 7px 13px;
  border-radius: 8px;
  font-size: 12.5px;
  font-weight: 700;
  cursor: pointer;
  box-shadow: 0 2px 10px rgba(124, 58, 237, 0.35);
}

.pro-status-btn.unlocked {
  background: linear-gradient(135deg, #059669, #0d9488);
  box-shadow: none;
}

.container {
  max-width: 1320px;
  margin: 0 auto;
  padding: 20px;
}

.hero-strip {
  background: linear-gradient(120deg, #ffffff 0%, #eff6ff 100%);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 20px;
  margin-bottom: 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  box-shadow: var(--shadow);
}

.hero-strip h1 {
  margin: 0 0 4px 0;
  font-size: 20px;
  font-weight: 800;
  color: #0f172a;
}

.hero-strip p {
  margin: 0;
  font-size: 13.5px;
  color: var(--text-muted);
}

.savings-pill {
  background: var(--accent-soft);
  border: 1px solid #a7f3d0;
  color: #065f46;
  padding: 8px 14px;
  border-radius: 10px;
  font-size: 13px;
  font-weight: 700;
  white-space: nowrap;
}

.workspace-grid {
  display: grid;
  grid-template-columns: 370px 1fr;
  gap: 18px;
  align-items: start;
}

@media (max-width: 980px) {
  .workspace-grid {
    grid-template-columns: 1fr;
  }
}

.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  box-shadow: var(--shadow);
}

.panel-section {
  padding-bottom: 16px;
  margin-bottom: 16px;
  border-bottom: 1px solid var(--border);
}

.panel-section:last-child {
  padding-bottom: 0;
  margin-bottom: 0;
  border-bottom: none;
}

.section-label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-subtle);
  margin-bottom: 10px;
}

.upload-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 8px;
}

.upload-dropzone {
  border: 1.5px dashed #93c5fd;
  background: var(--primary-soft);
  border-radius: var(--radius-sm);
  padding: 11px 12px;
  text-align: center;
  cursor: pointer;
  transition: all 0.15s;
  font-size: 13px;
  font-weight: 600;
  color: var(--primary);
}

.upload-dropzone:hover,
.upload-dropzone.dragover {
  background: #dbeafe;
  border-color: var(--primary);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 9px 14px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid var(--border-strong);
  background: var(--surface);
  color: var(--text);
  transition: all 0.15s;
  text-decoration: none;
}

.btn:hover {
  background: var(--surface-alt);
}

.btn-demo {
  background: #f8fafc;
  color: #1e293b;
  border-color: #cbd5e1;
  white-space: nowrap;
}

.btn-primary {
  background: var(--primary);
  color: #ffffff;
  border-color: var(--primary);
}

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

.btn-pro {
  background: linear-gradient(135deg, #7c3aed, #2563eb);
  color: #ffffff;
  border: none;
}

.btn-pro:hover {
  opacity: 0.95;
}

.btn-accent {
  background: var(--accent);
  color: #ffffff;
  border-color: var(--accent);
}

.btn-accent:hover {
  background: #047857;
}

.select-input {
  width: 100%;
  padding: 9px 11px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-strong);
  font-size: 13.5px;
  font-weight: 600;
  color: var(--text);
  background: #ffffff;
}

.spec-callout {
  margin-top: 9px;
  padding: 9px 11px;
  background: var(--surface-alt);
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 12px;
  color: var(--text-muted);
  line-height: 1.45;
}

.control-group {
  margin-bottom: 11px;
}

.control-group:last-child {
  margin-bottom: 0;
}

.control-header {
  display: flex;
  justify-content: space-between;
  font-size: 12.5px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 4px;
}

.control-val {
  color: var(--primary);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
}

input[type="range"] {
  width: 100%;
  accent-color: var(--primary);
  cursor: pointer;
}

.inline-btns {
  display: flex;
  gap: 6px;
  margin-top: 8px;
  flex-wrap: wrap;
}

.btn-xs {
  padding: 5px 9px;
  font-size: 12px;
  border-radius: 7px;
}

.bg-swatches {
  display: flex;
  gap: 8px;
  margin-top: 8px;
}

.swatch-btn {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 6px 8px;
  border-radius: 7px;
  border: 1.5px solid var(--border-strong);
  background: #ffffff;
  font-size: 11.5px;
  font-weight: 600;
  cursor: pointer;
}

.swatch-btn.active {
  border-color: var(--primary);
  background: var(--primary-soft);
  color: var(--primary);
}

.swatch-dot {
  width: 13px;
  height: 13px;
  border-radius: 50%;
  border: 1px solid #94a3b8;
}

.checkbox-row {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12.5px;
  color: var(--text-muted);
  cursor: pointer;
  margin-top: 8px;
}

.stage-grid {
  display: grid;
  grid-template-columns: minmax(280px, 380px) 1fr;
  gap: 18px;
  align-items: start;
}

@media (max-width: 1180px) {
  .stage-grid {
    grid-template-columns: 1fr;
  }
}

.canvas-card {
  background: var(--surface-alt);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 14px;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.card-head {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
  gap: 8px;
  flex-wrap: wrap;
}

.card-title {
  font-size: 13.5px;
  font-weight: 700;
  color: var(--text);
}

.crop-viewport {
  position: relative;
  background: repeating-conic-gradient(#e2e8f0 0% 25%, #f8fafc 0% 50%) 50% / 16px 16px;
  border-radius: 10px;
  border: 1px solid var(--border-strong);
  overflow: hidden;
  box-shadow: 0 6px 18px rgba(15, 23, 42, 0.08);
  touch-action: none;
  cursor: grab;
  max-width: 100%;
}

.crop-viewport:active {
  cursor: grabbing;
}

#cropCanvas {
  display: block;
  max-width: 100%;
  height: auto;
}

.drag-hint {
  margin-top: 8px;
  font-size: 12px;
  color: var(--text-subtle);
  text-align: center;
}

.sheet-tabs {
  display: inline-flex;
  background: #e2e8f0;
  padding: 3px;
  border-radius: 8px;
  gap: 3px;
}

.sheet-tab {
  border: none;
  background: transparent;
  padding: 5px 10px;
  border-radius: 6px;
  font-size: 12px;
  font-weight: 700;
  color: var(--text-muted);
  cursor: pointer;
}

.sheet-tab.active {
  background: #ffffff;
  color: var(--text);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
}

.sheet-preview-wrap {
  width: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 10px;
  background: #cbd5e1;
  border-radius: 10px;
  min-height: 280px;
}

#sheetCanvas {
  display: block;
  max-width: 100%;
  max-height: 410px;
  height: auto;
  background: #ffffff;
  box-shadow: 0 10px 25px rgba(15, 23, 42, 0.18);
  border-radius: 3px;
}

.sheet-meta-bar {
  width: 100%;
  margin-top: 10px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
  color: var(--text-muted);
  flex-wrap: wrap;
  gap: 8px;
}

.export-actions {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 10px;
}

.export-card {
  border: 1px solid var(--border);
  border-radius: 11px;
  padding: 12px;
  background: var(--surface);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 9px;
}

.export-card.pro-card {
  border-color: #c4b5fd;
  background: linear-gradient(180deg, #ffffff 0%, #faf5ff 100%);
}

.export-card-title {
  font-size: 13px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 6px;
}

.tier-tag {
  font-size: 10.5px;
  font-weight: 800;
  padding: 2px 7px;
  border-radius: 999px;
  text-transform: uppercase;
  white-space: nowrap;
  flex-shrink: 0;
}

.tier-free {
  background: #dbeafe;
  color: #1d4ed8;
}

.tier-pro {
  background: #ede9fe;
  color: #6d28d9;
}

.export-card-desc {
  font-size: 12px;
  color: var(--text-muted);
}

.footer-monetization {
  margin-top: 18px;
}

.tip-strip {
  margin-top: 12px;
  padding: 12px 16px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--surface);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  font-size: 13px;
  color: var(--text-muted);
}

.seo-links-footer {
  margin-top: 16px;
  padding: 14px 16px;
  border-radius: 12px;
  background: var(--surface);
  border: 1px solid var(--border);
  font-size: 12.5px;
}

.seo-links-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 14px;
  margin-top: 8px;
}

.seo-links-grid a {
  color: var(--primary);
  text-decoration: none;
}

.seo-links-grid a:hover {
  text-decoration: underline;
}

/* Modal */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.6);
  backdrop-filter: blur(3px);
  display: none;
  align-items: center;
  justify-content: center;
  padding: 16px;
  z-index: 100;
}

.modal-backdrop.open {
  display: flex;
}

.modal-box {
  background: #ffffff;
  border-radius: 16px;
  max-width: 480px;
  width: 100%;
  padding: 24px;
  box-shadow: 0 24px 50px rgba(15, 23, 42, 0.28);
  border: 1px solid var(--border);
}

.modal-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 12px;
}

.modal-head h2 {
  margin: 0;
  font-size: 19px;
}

.modal-close {
  border: none;
  background: #f1f5f9;
  width: 30px;
  height: 30px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 16px;
}

.pro-perks {
  margin: 14px 0;
  padding: 12px 14px;
  background: var(--pro-soft);
  border: 1px solid #ddd6fe;
  border-radius: 10px;
  font-size: 13px;
}

.pro-perks ul {
  margin: 6px 0 0 0;
  padding-left: 18px;
}

.pro-perks li {
  margin-bottom: 5px;
}

.key-input-row {
  display: flex;
  gap: 8px;
  margin-top: 12px;
}

.key-input {
  flex: 1;
  padding: 10px 12px;
  border: 1.5px solid var(--border-strong);
  border-radius: 9px;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 13.5px;
  text-transform: uppercase;
}

.modal-msg {
  margin-top: 8px;
  font-size: 12.5px;
  min-height: 18px;
}

.modal-msg.err {
  color: #dc2626;
}

.modal-msg.ok {
  color: #059669;
  font-weight: 700;
}

/* Print Only Sheet */
#printSheetMount {
  display: none;
}

@media print {
  body.print-sheet-mode {
    background: #ffffff !important;
    margin: 0 !important;
    padding: 0 !important;
  }
  body.print-sheet-mode .topbar,
  body.print-sheet-mode .container,
  body.print-sheet-mode .modal-backdrop {
    display: none !important;
  }
  body.print-sheet-mode #printSheetMount {
    display: flex !important;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 100%;
    margin: 0;
    padding: 0;
  }
  body.print-sheet-mode #printSheetMount img {
    display: block;
    max-width: 100%;
    height: auto;
  }
}