@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@300;400;500;600&family=Space+Mono:wght@400;700&display=swap');

:root {
  --bg: #0e0e12;
  --surface: #16161c;
  --surface2: #1e1e26;
  --border: rgba(255,255,255,0.07);
  --accent: #c8f55a;
  --accent2: #5af5c8;
  --text: #f0f0f0;
  --muted: #888;
  --danger: #f55a5a;
  --success: #5af55a;
  --radius: 12px;
}

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

body {
  font-family: 'DM Sans', sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
}

header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 14px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 100;
}

.logo {
  font-family: 'Space Mono', monospace;
  font-size: 1.1rem;
  color: var(--accent);
  text-decoration: none;
  letter-spacing: -0.5px;
}

.header-nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.9rem;
  margin-left: 20px;
  transition: color 0.2s;
}
.header-nav a:hover { color: var(--text); }

/* ─── LAYOUT ─── */
.app {
  display: grid;
  grid-template-columns: 260px 1fr 280px;
  height: calc(100vh - 57px);
  overflow: hidden;
}

/* ─── LEFT PANEL ─── */
.tools-panel {
  background: var(--surface);
  border-right: 1px solid var(--border);
  overflow-y: auto;
  padding: 16px;
  scrollbar-width: thin;
  scrollbar-color: #333 transparent;
}
.tools-panel::-webkit-scrollbar { width: 4px; }
.tools-panel::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }

.panel-section { margin-bottom: 22px; }

.panel-label {
  font-family: 'Space Mono', monospace;
  font-size: 0.65rem;
  letter-spacing: 2px;
  color: var(--muted);
  text-transform: uppercase;
  margin-bottom: 10px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--border);
}

.upload-zone {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 20px;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s;
  margin-bottom: 8px;
}
.upload-zone:hover, .upload-zone.drag-over {
  border-color: var(--accent);
  background: rgba(200,245,90,0.05);
}
.upload-zone i { font-size: 1.4rem; color: var(--accent); margin-bottom: 8px; display: block; }
.upload-zone span { font-size: 0.8rem; color: var(--muted); }

.tool-btn {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 9px 12px;
  border-radius: 8px;
  border: 1px solid transparent;
  background: transparent;
  color: var(--text);
  font-family: 'DM Sans', sans-serif;
  font-size: 0.88rem;
  cursor: pointer;
  transition: all 0.15s;
  margin-bottom: 3px;
  text-align: left;
}
.tool-btn i { width: 16px; color: var(--muted); font-size: 0.85rem; }
.tool-btn:hover { background: var(--surface2); }
.tool-btn.active { background: rgba(200,245,90,0.1); border-color: rgba(200,245,90,0.3); color: var(--accent); }
.tool-btn.active i { color: var(--accent); }

.transform-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
}

/* Page list in left panel */
.page-thumb-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
  max-height: 260px;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: #333 transparent;
}
.page-thumb-list::-webkit-scrollbar { width: 3px; }

.page-thumb {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 7px 8px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--surface2);
  cursor: pointer;
  transition: all 0.15s;
  font-size: 0.8rem;
  color: var(--muted);
}
.page-thumb:hover { border-color: var(--accent); color: var(--text); }
.page-thumb.active { border-color: var(--accent); background: rgba(200,245,90,0.08); color: var(--accent); }
.page-thumb-num {
  font-family: 'Space Mono', monospace;
  font-size: 0.7rem;
  min-width: 22px;
  text-align: center;
}
.page-thumb-preview {
  width: 28px;
  height: 36px;
  background: #333;
  border-radius: 3px;
  overflow: hidden;
  flex-shrink: 0;
}
.page-thumb-preview canvas { width: 100%; height: 100%; }

/* ─── CANVAS AREA ─── */
.canvas-area {
  background: var(--bg);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.canvas-wrap {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
  overflow: hidden;
}

.canvas-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  color: var(--muted);
  text-align: center;
}
.canvas-placeholder i { font-size: 3rem; color: var(--border); }
.canvas-placeholder h3 { font-size: 1rem; color: var(--text); font-weight: 500; }
.canvas-placeholder p { font-size: 0.85rem; }
.canvas-placeholder.hidden { display: none; }

#pdfViewport {
  position: relative;
  display: none;
  box-shadow: 0 20px 60px rgba(0,0,0,0.5);
  border-radius: 4px;
  overflow: hidden;
}

#pageCanvas {
  display: block;
  border-radius: 4px;
}

/* Annotation overlay on top of the PDF canvas */
#annotationCanvas {
  position: absolute;
  top: 0; left: 0;
  border-radius: 4px;
  cursor: default;
}

/* Text overlay box */
.text-annotation {
  position: absolute;
  border: 1px dashed var(--accent);
  padding: 4px 6px;
  font-size: 14px;
  color: #111;
  background: rgba(255,255,255,0.92);
  border-radius: 4px;
  cursor: move;
  min-width: 80px;
  user-select: none;
  line-height: 1.3;
  white-space: pre-wrap;
  word-break: break-word;
}
.text-annotation.selected { border-color: var(--accent2); outline: 2px solid rgba(90,245,200,0.3); }
.text-annotation input[type=text] {
  background: transparent;
  border: none;
  outline: none;
  font-family: inherit;
  font-size: inherit;
  color: inherit;
  width: 100%;
  min-width: 60px;
}

/* Canvas toolbar */
.canvas-toolbar {
  position: absolute;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 8px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 50px;
  padding: 8px 14px;
  white-space: nowrap;
  z-index: 10;
}

.canvas-toolbar button {
  padding: 7px 14px;
  border: none;
  border-radius: 50px;
  font-size: 0.82rem;
  cursor: pointer;
  font-family: 'DM Sans', sans-serif;
  transition: all 0.15s;
}

.btn-reset { background: rgba(245,90,90,0.15); color: var(--danger); }
.btn-reset:hover { background: rgba(245,90,90,0.25); }
.btn-save { background: var(--accent); color: #0e0e12; font-weight: 600; }
.btn-save:hover { background: #d8ff6a; }
.btn-undo { background: var(--surface2); color: var(--muted); }
.btn-undo:hover { color: var(--text); }
.btn-delete { background: rgba(245,90,90,0.15); color: var(--danger); display: none; }
.btn-delete.visible { display: block; }

/* Page nav */
.page-nav {
  position: absolute;
  bottom: 72px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 50px;
  padding: 6px 14px;
  font-size: 0.82rem;
}
.page-nav button {
  background: none;
  border: none;
  color: var(--muted);
  cursor: pointer;
  padding: 2px 6px;
  font-size: 1rem;
  transition: color 0.15s;
}
.page-nav button:hover { color: var(--accent); }
#pageLabel {
  font-family: 'Space Mono', monospace;
  font-size: 0.75rem;
  color: var(--text);
  min-width: 70px;
  text-align: center;
}

/* Zoom controls */
.zoom-controls {
  position: absolute;
  top: 16px;
  right: 16px;
  display: flex;
  gap: 6px;
}
.zoom-btn {
  width: 32px; height: 32px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.15s;
}
.zoom-btn:hover { background: var(--surface2); }

/* ─── RIGHT PANEL ─── */
.adjustments-panel {
  background: var(--surface);
  border-left: 1px solid var(--border);
  overflow-y: auto;
  padding: 16px;
  scrollbar-width: thin;
  scrollbar-color: #333 transparent;
}
.adjustments-panel::-webkit-scrollbar { width: 4px; }
.adjustments-panel::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }

.adj-group { margin-bottom: 22px; }
.adj-item { margin-bottom: 14px; }
.adj-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 6px;
}
.adj-name { font-size: 0.82rem; color: var(--muted); }
.adj-value {
  font-family: 'Space Mono', monospace;
  font-size: 0.78rem;
  color: var(--accent);
  min-width: 38px;
  text-align: right;
}

input[type=range] {
  -webkit-appearance: none;
  width: 100%;
  height: 3px;
  background: var(--surface2);
  border-radius: 2px;
  outline: none;
}
input[type=range]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px; height: 14px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  transition: transform 0.1s;
}
input[type=range]::-webkit-slider-thumb:hover { transform: scale(1.3); }

/* Color pickers row */
.color-row {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 8px;
}
.color-swatch {
  width: 22px; height: 22px;
  border-radius: 50%;
  cursor: pointer;
  border: 2px solid transparent;
  transition: border-color 0.15s;
  flex-shrink: 0;
}
.color-swatch.active { border-color: var(--accent); }
.color-swatch:hover { transform: scale(1.15); }

/* Custom color picker */
.custom-color-wrap {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 8px;
}
.custom-color-wrap input[type=color] {
  width: 30px; height: 22px;
  border: 1px solid var(--border);
  background: none;
  border-radius: 4px;
  cursor: pointer;
  padding: 0 2px;
}
.custom-color-wrap label { font-size: 0.78rem; color: var(--muted); }

/* Font size row */
.font-size-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 10px;
}
.font-size-row label { font-size: 0.78rem; color: var(--muted); white-space: nowrap; }
.font-size-row input[type=number] {
  width: 56px;
  background: var(--surface2);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 6px;
  padding: 4px 8px;
  font-size: 0.82rem;
  font-family: 'Space Mono', monospace;
}

/* Page info block */
.info-block {
  background: var(--surface2);
  border-radius: 8px;
  padding: 12px;
  margin-bottom: 10px;
  font-size: 0.8rem;
  color: var(--muted);
  line-height: 1.8;
}
.info-block span { color: var(--text); font-family: 'Space Mono', monospace; font-size: 0.75rem; }

/* Mini page order list */
.page-order-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
  max-height: 180px;
  overflow-y: auto;
}
.page-order-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 10px;
  background: var(--surface2);
  border-radius: 7px;
  font-size: 0.78rem;
  color: var(--muted);
  cursor: grab;
  border: 1px solid transparent;
}
.page-order-item:hover { border-color: var(--border); color: var(--text); }
.page-order-item.dragging { opacity: 0.5; border-color: var(--accent); }
.page-order-item .pg-actions {
  display: flex;
  gap: 4px;
}
.pg-action-btn {
  background: none;
  border: none;
  color: var(--muted);
  cursor: pointer;
  font-size: 0.78rem;
  padding: 2px 4px;
  border-radius: 4px;
  transition: color 0.15s;
}
.pg-action-btn:hover { color: var(--accent); }
.pg-action-btn.danger:hover { color: var(--danger); }

/* Draw mode canvas */
#annotationCanvas.draw-mode { cursor: crosshair; }
#annotationCanvas.text-mode { cursor: text; }

/* Toast */
#toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background: var(--surface2);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 10px 16px;
  border-radius: 8px;
  font-size: 0.85rem;
  opacity: 0;
  transform: translateY(10px);
  transition: all 0.3s;
  pointer-events: none;
  z-index: 999;
}
#toast.show { opacity: 1; transform: translateY(0); }

/* Separator */
.sep { height: 1px; background: var(--border); margin: 12px 0; }

/* Progress bar */
#loadProgress {
  display: none;
  margin-top: 8px;
}
#loadProgress progress {
  width: 100%;
  height: 4px;
  border-radius: 2px;
  background: var(--surface2);
  border: none;
  appearance: none;
}
#loadProgress progress::-webkit-progress-bar { background: var(--surface2); border-radius: 2px; }
#loadProgress progress::-webkit-progress-value { background: var(--accent); border-radius: 2px; }
#loadProgress span { font-size: 0.72rem; color: var(--muted); font-family: 'Space Mono', monospace; }
/* ── MOBILE PANEL OVERLAY ── */
.mobile-toolbar-toggle {
  display: none;
  position: fixed;
  bottom: 90px;
  left: 16px;
  z-index: 200;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: var(--accent);
  color: #0e0e12;
  border: none;
  font-size: 1.1rem;
  cursor: pointer;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 16px rgba(200,245,90,0.35);
}
 
.mobile-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.55);
  z-index: 150;
  opacity: 0;
  transition: opacity 0.25s;
}
.mobile-overlay.open { opacity: 1; }
 
.mobile-panel {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 160;
  background: var(--surface);
  border-top: 1px solid var(--border);
  border-radius: 20px 20px 0 0;
  padding: 16px;
  transform: translateY(100%);
  transition: transform 0.3s cubic-bezier(0.32,0.72,0,1);
  max-height: 80vh;
  overflow-y: auto;
}
.mobile-panel.open { transform: translateY(0); }
 
.mobile-panel-handle {
  width: 40px;
  height: 4px;
  background: var(--border);
  border-radius: 2px;
  margin: 0 auto 16px;
}
 
.mobile-tabs {
  display: flex;
  gap: 6px;
  margin-bottom: 14px;
  overflow-x: auto;
  scrollbar-width: none;
}
.mobile-tabs::-webkit-scrollbar { display: none; }
 
.mobile-tab {
  padding: 6px 14px;
  border-radius: 20px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--muted);
  font-size: 0.78rem;
  font-family: 'DM Sans', sans-serif;
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.15s;
}
.mobile-tab.active {
  background: rgba(200,245,90,0.12);
  border-color: var(--accent);
  color: var(--accent);
}
 
.mobile-tab-panel { display: none; }
.mobile-tab-panel.active { display: block; }
 
.mobile-tool-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}
 
.mobile-tool-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 12px 8px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--surface2);
  color: var(--muted);
  font-size: 0.72rem;
  cursor: pointer;
  transition: all 0.15s;
  text-align: center;
}
.mobile-tool-item i { font-size: 1.1rem; }
.mobile-tool-item:hover, .mobile-tool-item.active {
  border-color: var(--accent);
  color: var(--accent);
  background: rgba(200,245,90,0.08);
}
 
/* ── RESPONSIVE ── */
@media (max-width: 900px) {
  .app {
    grid-template-columns: 1fr !important;
    grid-template-rows: 1fr;
  }
  .tools-panel,
  .adjustments-panel {
    display: none !important;
  }
  .mobile-toolbar-toggle { display: flex; }
  .mobile-overlay,
  .mobile-panel { display: block; }
  .canvas-area {
    height: calc(100vh - 57px);
  }
  .canvas-toolbar {
    padding: 6px 10px;
    gap: 5px;
    bottom: 12px;
  }
  .canvas-toolbar button {
    padding: 6px 10px;
    font-size: 0.75rem;
  }
  .page-nav {
    bottom: 62px;
  }
}
 
/* ── SEO SECTION ── */
.seo-section {
  background: var(--surface);
  border-top: 1px solid var(--border);
  padding: 64px 0 40px;
  color: var(--text);
}
 
.seo-inner {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 24px;
}
 
.seo-hero {
  text-align: center;
  margin-bottom: 56px;
}
 
.seo-hero h1 {
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  font-weight: 600;
  color: var(--text);
  margin-bottom: 12px;
  line-height: 1.25;
}
 
.seo-hero h1 span {
  color: var(--accent);
  font-family: 'Space Mono', monospace;
}
 
.seo-hero p {
  color: var(--muted);
  font-size: 1rem;
  max-width: 620px;
  margin: 0 auto;
  line-height: 1.7;
}
 
/* Features grid */
.seo-features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
  margin-bottom: 56px;
}
 
.seo-feature-card {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 18px;
  transition: border-color 0.2s;
}
.seo-feature-card:hover { border-color: rgba(200,245,90,0.3); }
 
.seo-feature-card i {
  font-size: 1.25rem;
  color: var(--accent);
  margin-bottom: 10px;
  display: block;
}
 
.seo-feature-card h3 {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 6px;
}
 
.seo-feature-card p {
  font-size: 0.8rem;
  color: var(--muted);
  line-height: 1.6;
}
 
/* Two column prose */
.seo-prose-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  margin-bottom: 56px;
}
 
@media (max-width: 680px) {
  .seo-prose-grid { grid-template-columns: 1fr; }
  .seo-features { grid-template-columns: 1fr 1fr; }
}
 
.seo-prose h2 {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 10px;
}
 
.seo-prose p {
  font-size: 0.83rem;
  color: var(--muted);
  line-height: 1.75;
  margin-bottom: 8px;
}
 
/* How to use steps */
.seo-steps {
  margin-bottom: 56px;
}
 
.seo-steps h2 {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 20px;
  text-align: center;
}
 
.steps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 12px;
}
 
.step-card {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 16px;
  display: flex;
  gap: 12px;
  align-items: flex-start;
}
 
.step-num {
  font-family: 'Space Mono', monospace;
  font-size: 0.68rem;
  color: var(--accent);
  background: rgba(200,245,90,0.1);
  border: 1px solid rgba(200,245,90,0.25);
  border-radius: 6px;
  padding: 2px 7px;
  white-space: nowrap;
  margin-top: 2px;
}
 
.step-body h4 {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 4px;
}
 
.step-body p {
  font-size: 0.77rem;
  color: var(--muted);
  line-height: 1.6;
}
 
/* FAQ */
.seo-faq {
  margin-bottom: 56px;
}
 
.seo-faq h2 {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 20px;
  text-align: center;
}
 
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
 
.faq-item {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
}
 
.faq-q {
  width: 100%;
  text-align: left;
  padding: 14px 16px;
  background: none;
  border: none;
  color: var(--text);
  font-size: 0.88rem;
  font-family: 'DM Sans', sans-serif;
  font-weight: 500;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  transition: color 0.15s;
}
.faq-q:hover { color: var(--accent); }
.faq-q i { color: var(--muted); font-size: 0.75rem; transition: transform 0.2s; flex-shrink: 0; }
 
.faq-item.open .faq-q i { transform: rotate(180deg); }
.faq-item.open .faq-q { color: var(--accent); }
 
.faq-a {
  display: none;
  padding: 0 16px 14px;
  font-size: 0.82rem;
  color: var(--muted);
  line-height: 1.7;
  border-top: 1px solid var(--border);
  padding-top: 12px;
}
.faq-item.open .faq-a { display: block; }
 
/* Trust bar */
.seo-trust {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  justify-content: center;
  padding: 28px 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  margin-bottom: 40px;
}
 
.trust-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  color: var(--muted);
}
.trust-item i { color: var(--accent2); font-size: 0.9rem; }
 
/* Comparison table */
.seo-comparison {
  margin-bottom: 56px;
}
.seo-comparison h2 {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 20px;
  text-align: center;
}
.comparison-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.82rem;
}
.comparison-table th {
  background: var(--surface2);
  color: var(--text);
  font-weight: 600;
  padding: 11px 14px;
  text-align: left;
  border-bottom: 1px solid var(--border);
}
.comparison-table th:first-child { border-radius: 10px 0 0 0; }
.comparison-table th:last-child { border-radius: 0 10px 0 0; }
.comparison-table td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  color: var(--muted);
}
.comparison-table tr:hover td { background: var(--surface2); }
.comparison-table .yes { color: var(--success); }
.comparison-table .no  { color: var(--danger); }
.comparison-table .highlight-col { color: var(--accent); font-weight: 500; }