/* ===== CSS Variables ===== */
:root {
  --bg: #F8F9FA;
  --surface: #FFFFFF;
  --border: #E0E0E0;
  --border-focus: #1a73e8;
  --text-primary: #111111;
  --text-secondary: #555555;
  --text-muted: #888888;
  --accent: #1a73e8;
  --accent-hover: #1557b0;
  --accent-light: #e8f0fe;
  --danger: #d32f2f;
  --success: #2e7d32;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --font: 'Pretendard', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --transition: 0.2s ease;
  --step-header-h: 56px;
}

/* ===== Reset ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
}
img { max-width: 100%; display: block; }
button { cursor: pointer; font-family: var(--font); }
input, select, textarea { font-family: var(--font); }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ===== Layout ===== */
.container {
  max-width: 780px;
  margin: 0 auto;
  padding: 0 20px;
}
.wide-container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ===== Header ===== */
.site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
}
.logo {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
  text-decoration: none;
}
.logo span { color: var(--accent); }
.site-nav { display: flex; gap: 20px; }
.site-nav a {
  font-size: 0.875rem;
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--transition);
}
.site-nav a:hover { color: var(--accent); }

/* Ad slot header */
.ad-slot-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  text-align: center;
  padding: 8px;
  min-height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.ad-placeholder {
  background: #f0f0f0;
  border: 1px dashed var(--border);
  border-radius: var(--radius-sm);
  padding: 8px 20px;
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* ===== Hero ===== */
.hero {
  padding: 48px 0 32px;
  text-align: center;
}
.hero h1 {
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 12px;
  letter-spacing: -0.02em;
}
.hero p {
  font-size: 1rem;
  color: var(--text-secondary);
  margin-bottom: 16px;
}
.trust-badges {
  display: grid;
  grid-template-columns: repeat(2, auto);
  justify-content: center;
  gap: 8px;
  margin-top: 12px;
}
@media (min-width: 520px) {
  .trust-badges { grid-template-columns: repeat(4, auto); }
}
.badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  background: var(--accent-light);
  color: var(--accent);
  border-radius: 20px;
  padding: 4px 12px;
  font-size: 0.8rem;
  font-weight: 600;
}
.badge svg { width: 14px; height: 14px; flex-shrink: 0; }

/* ===== Pipeline ===== */
.pipeline {
  padding: 0 0 40px;
}

/* Upload Zone */
.upload-zone {
  background: var(--surface);
  border: 2px dashed var(--border);
  border-radius: var(--radius-lg);
  padding: 48px 24px;
  text-align: center;
  cursor: pointer;
  transition: border-color var(--transition), background var(--transition);
  position: relative;
}
.upload-zone:hover,
.upload-zone.dragover {
  border-color: var(--accent);
  background: var(--accent-light);
}
.upload-zone input[type="file"] {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
  width: 100%;
  height: 100%;
}
.upload-icon { font-size: 2.5rem; margin-bottom: 12px; }
.upload-zone h2 { font-size: 1.1rem; font-weight: 700; margin-bottom: 6px; }
.upload-zone p { font-size: 0.875rem; color: var(--text-muted); }
.upload-zone .formats { font-size: 0.8rem; color: var(--text-muted); margin-top: 8px; }

/* Image Preview Strip */
.preview-strip {
  display: none;
  background: var(--surface);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  margin-top: 0;
}
.preview-strip.visible { display: block; }
.preview-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
}
.preview-header h3 { font-size: 0.9rem; font-weight: 600; }
.btn-change {
  font-size: 0.8rem;
  color: var(--accent);
  background: none;
  border: none;
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  transition: background var(--transition);
}
.btn-change:hover { background: var(--accent-light); }
.preview-canvas-wrap {
  background: #e8e8e8;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 200px;
  max-height: 400px;
  overflow: hidden;
  position: relative;
}
.preview-canvas-wrap canvas {
  max-width: 100%;
  max-height: 400px;
  object-fit: contain;
  display: block;
}
.preview-info {
  padding: 10px 16px;
  font-size: 0.8rem;
  color: var(--text-muted);
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

/* Step Card */
.step-card {
  background: var(--surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  margin-top: 12px;
  overflow: hidden;
  display: none;
}
.step-card.revealed { display: block; }
.step-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
  height: var(--step-header-h);
  border-bottom: 1px solid var(--border);
  cursor: pointer;
  user-select: none;
  transition: background var(--transition);
}
.step-header:hover { background: #fafafa; }
.step-header-left {
  display: flex;
  align-items: center;
  gap: 10px;
}
.step-num {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  font-size: 0.8rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.step-num.done { background: var(--success); }
.step-title { font-size: 0.95rem; font-weight: 600; }
.step-subtitle { font-size: 0.78rem; color: var(--text-muted); margin-left: 4px; }
.step-toggle {
  font-size: 1.2rem;
  color: var(--text-muted);
  transition: transform var(--transition);
  line-height: 1;
}
.step-card.collapsed .step-toggle { transform: rotate(-90deg); }
.step-body {
  padding: 20px 16px;
}
.step-card.collapsed .step-body { display: none; }

/* Download Row */
.download-row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 16px;
  background: var(--bg);
  border-top: 1px solid var(--border);
  flex-wrap: wrap;
}
.download-row span { font-size: 0.8rem; color: var(--text-muted); flex: 1; min-width: 120px; }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 9px 18px;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 600;
  border: none;
  transition: background var(--transition), opacity var(--transition);
  white-space: nowrap;
}
.btn:disabled { opacity: 0.4; cursor: not-allowed; }
.btn-primary {
  background: var(--accent);
  color: #fff;
}
.btn-primary:hover:not(:disabled) { background: var(--accent-hover); }
.btn-secondary {
  background: var(--surface);
  color: var(--text-primary);
  border: 1px solid var(--border);
}
.btn-secondary:hover:not(:disabled) { background: var(--bg); }
.btn-download {
  background: var(--text-primary);
  color: #fff;
}
.btn-download:hover:not(:disabled) { background: #333; }
.btn-sm { padding: 6px 12px; font-size: 0.8rem; }
.btn-icon { width: 32px; height: 32px; padding: 0; justify-content: center; }

/* ===== Editor Step ===== */
.editor-canvas-area {
  background: #e8e8e8;
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 180px;
}
#editCanvas {
  max-width: 100%;
  max-height: 360px;
  cursor: default;
  display: block;
  touch-action: none;
}
.text-controls { display: flex; flex-direction: column; gap: 12px; }
.control-row {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}
.control-row label {
  font-size: 0.8rem;
  color: var(--text-secondary);
  min-width: 60px;
  font-weight: 500;
}
.control-input {
  padding: 7px 10px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  background: var(--bg);
  color: var(--text-primary);
  transition: border-color var(--transition);
  flex: 1;
  min-width: 0;
}
.control-input:focus { outline: none; border-color: var(--border-focus); }
input[type="color"].control-input { padding: 2px; height: 36px; width: 52px; flex: none; }
input[type="number"].control-input { width: 80px; flex: none; }
.text-layer-list {
  margin-top: 12px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.text-layer-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 10px;
  background: var(--bg);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  font-size: 0.82rem;
}
.text-layer-item span:not(.color-dot):not(.drag-handle) { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.text-layer-item .color-dot {
  width: 16px; height: 16px; border-radius: 3px; flex-shrink: 0; flex: none; border: 1px solid rgba(0,0,0,0.2);
}
.text-layer-item button {
  background: none; border: none; padding: 2px 4px;
  color: var(--text-muted); font-size: 0.85rem;
  transition: color var(--transition);
}
.text-layer-item button:hover { color: var(--danger); }
.drag-handle {
  cursor: grab;
  color: var(--text-muted);
  font-size: 1.1rem;
  padding: 0 2px;
  flex-shrink: 0;
  user-select: none;
}
.drag-handle:active { cursor: grabbing; }
.text-layer-item.dragging { opacity: 0.35; }
.text-layer-item.drag-over { border-top: 2px solid var(--primary); }

/* ── 크롭 ──────────────────────────────────────────────────────────────── */
.crop-ratio-btns {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-bottom: 4px;
}
.crop-ratio-btn {
  padding: 4px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: none;
  font-size: 0.82rem;
  cursor: pointer;
  color: var(--text-secondary);
  transition: background var(--transition), color var(--transition), border-color var(--transition);
}
.crop-ratio-btn:hover { border-color: var(--accent); color: var(--accent); }
.crop-ratio-btn.active { background: var(--accent); color: #fff; border-color: var(--accent); }
.crop-canvas-wrap {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  cursor: crosshair;
  user-select: none;
  background: #111;
}
#cropCanvas { display: block; width: 100%; height: auto; }
.crop-actions {
  display: flex;
  gap: 10px;
  justify-content: center;
  margin-top: 12px;
}
.btn-outline {
  background: none;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  padding: 7px 18px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  cursor: pointer;
  transition: border-color var(--transition), color var(--transition);
}
.btn-outline:hover { border-color: var(--accent); color: var(--accent); }

/* Drag handle hint */
.drag-hint {
  font-size: 0.78rem;
  color: var(--text-muted);
  text-align: center;
  margin-top: 6px;
}

/* ===== Converter Step ===== */
.format-options {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}
.format-btn {
  flex: 1;
  min-width: 80px;
  padding: 10px;
  border: 2px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--surface);
  text-align: center;
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--text-secondary);
  transition: all var(--transition);
}
.format-btn:hover { border-color: var(--accent); color: var(--accent); }
.format-btn.selected {
  border-color: var(--accent);
  background: var(--accent-light);
  color: var(--accent);
}
.format-desc {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 12px;
}

/* ===== Compressor Step ===== */
.apply-item {
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  margin-bottom: 10px;
  overflow: hidden;
}
.apply-header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 16px;
  cursor: pointer;
  background: var(--surface);
  user-select: none;
}
.apply-header input[type="checkbox"] {
  width: 17px;
  height: 17px;
  accent-color: var(--accent);
  cursor: pointer;
  flex-shrink: 0;
}
.apply-title {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
}
.apply-panel {
  padding: 14px 16px;
  border-top: 1px solid var(--border);
  background: var(--bg);
}

.range-row { display: flex; align-items: center; gap: 12px; margin-bottom: 8px; }
.range-row label { font-size: 0.85rem; color: var(--text-secondary); min-width: 56px; }
input[type="range"] {
  flex: 1;
  -webkit-appearance: none;
  height: 4px;
  background: var(--border);
  border-radius: 2px;
  outline: none;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px; height: 18px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  border: 2px solid #fff;
  box-shadow: 0 0 0 2px var(--accent);
}
.range-val {
  font-size: 0.875rem;
  font-weight: 700;
  min-width: 36px;
  text-align: right;
  color: var(--accent);
}

.resize-inputs { display: flex; flex-direction: column; gap: 10px; }
.resize-row { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.resize-row label { font-size: 0.85rem; color: var(--text-secondary); min-width: 36px; }
.resize-row input { width: 100px; }
.lock-ratio {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.82rem;
  color: var(--text-secondary);
  cursor: pointer;
}
.lock-ratio input[type="checkbox"] { cursor: pointer; accent-color: var(--accent); }
.size-hint {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* ===== Ad Slot Mid ===== */
.ad-slot-mid {
  margin: 32px 0;
  text-align: center;
  min-height: 90px;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* ===== Content Sections ===== */
.content-section { padding: 48px 0; }
.content-section + .content-section { border-top: 1px solid var(--border); }
.section-title {
  font-size: 1.4rem;
  font-weight: 800;
  margin-bottom: 20px;
  letter-spacing: -0.01em;
}
.section-intro {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-bottom: 24px;
  max-width: 640px;
  line-height: 1.7;
}

/* Feature Grid */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  margin-top: 20px;
}
.feature-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 20px;
}
.feature-icon { font-size: 1.6rem; margin-bottom: 10px; }
.feature-card h3 { font-size: 0.9rem; font-weight: 700; margin-bottom: 6px; }
.feature-card p { font-size: 0.82rem; color: var(--text-secondary); line-height: 1.5; }

/* FAQ */
.faq-list { display: flex; flex-direction: column; gap: 12px; margin-top: 20px; }
.faq-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
}
.faq-q {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px;
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 600;
  transition: background var(--transition);
  gap: 12px;
}
.faq-q:hover { background: var(--bg); }
.faq-toggle { font-size: 1rem; color: var(--text-muted); flex-shrink: 0; transition: transform var(--transition); }
.faq-item.open .faq-toggle { transform: rotate(45deg); }
.faq-a {
  display: none;
  padding: 0 16px 16px;
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.7;
}
.faq-item.open .faq-a { display: block; }

/* ===== Footer ===== */
.site-footer {
  background: var(--surface);
  border-top: 1px solid var(--border);
  padding: 24px 0;
  margin-top: 40px;
}
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}
.footer-logo { font-size: 1rem; font-weight: 700; color: var(--text-primary); }
.footer-logo span { color: var(--accent); }
.footer-links {
  display: flex;
  gap: 16px;
  font-size: 0.82rem;
  flex-wrap: wrap;
}
.footer-links a { color: var(--text-muted); }
.footer-links a:hover { color: var(--accent); }
.footer-copy { font-size: 0.78rem; color: var(--text-muted); }

/* ===== Utility ===== */
.hidden { display: none !important; }
.mt-8 { margin-top: 8px; }
.mt-12 { margin-top: 12px; }
.mt-16 { margin-top: 16px; }
.text-muted { color: var(--text-muted); font-size: 0.82rem; }
.divider { height: 1px; background: var(--border); margin: 16px 0; }

/* Toast */
.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 999;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.toast {
  background: var(--text-primary);
  color: #fff;
  padding: 10px 16px;
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  box-shadow: var(--shadow-md);
  animation: toastIn 0.2s ease;
}
.toast.success { background: var(--success); }
.toast.error { background: var(--danger); }
@keyframes toastIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }

/* ===== Pipeline Flow ===== */
.pipeline-flow {
  display: flex;
  flex-wrap: nowrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 24px;
  padding: 20px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow-x: auto;
}
.pf-step {
  font-size: 0.875rem;
  font-weight: 600;
  padding: 6px 14px;
  background: var(--bg);
  border-radius: 20px;
  color: var(--text-primary);
  white-space: nowrap;
}
.pf-final {
  background: var(--text-primary);
  color: #fff;
}
.pf-arrow {
  color: var(--text-muted);
  font-size: 0.9rem;
  flex-shrink: 0;
}
@media (max-width: 600px) {
  .pipeline-flow {
    flex-direction: column;
    align-items: center;
    gap: 4px;
    overflow-x: visible;
    padding: 20px 0 !important;
  }
  .pf-step { display: inline-flex; align-self: center; width: auto; }
  .pf-arrow { transform: rotate(90deg); align-self: center; }
}

/* ===== Responsive ===== */
@media (max-width: 600px) {
  .hero { padding: 28px 0 20px; }
  .step-body { padding: 16px 12px; }
  .download-row { padding: 10px 12px; }
  .preview-header { padding: 10px 12px; }
  .control-row { gap: 8px; }
  .footer-inner { flex-direction: column; align-items: flex-start; }
  .site-nav { gap: 12px; }
  .feature-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 400px) {
  .feature-grid { grid-template-columns: 1fr; }
  .format-options { gap: 6px; }
}