:root {
  --kb-yellow: #FFBC00;
  --kb-yellow-dark: #F0AE00;
  --kb-yellow-soft: #FFF5D6;
  --kb-text: #1A1A1A;
  --kb-sub: #555555;
  --kb-muted: #8A8A8A;
  --kb-line: #E5E5E5;
  --kb-bg: #F7F7F8;
  --kb-white: #FFFFFF;
  --kb-danger: #D93636;
  --kb-success: #1E8A4C;
  --radius: 10px;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.06);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  font-family: "Noto Sans KR", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  color: var(--kb-text);
  background: var(--kb-bg);
  -webkit-font-smoothing: antialiased;
}

/* Header */
.kb-header {
  background: var(--kb-white);
  border-bottom: 1px solid var(--kb-line);
  position: sticky;
  top: 0;
  z-index: 10;
}
.kb-header-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 18px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.kb-brand { display: flex; align-items: center; gap: 12px; }
.kb-logo {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 28px;
  background: var(--kb-yellow);
  color: #3D2900;
  font-weight: 900;
  font-size: 16px;
  letter-spacing: 0.5px;
  border-radius: 4px;
}
.kb-brand-text { font-weight: 700; font-size: 16px; color: var(--kb-text); }
.kb-nav { display: flex; gap: 24px; }
.kb-nav a {
  color: var(--kb-sub);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  padding: 6px 2px;
  border-bottom: 2px solid transparent;
  transition: color 0.15s, border-color 0.15s;
}
.kb-nav a:hover { color: var(--kb-text); }
.kb-nav a.active { color: var(--kb-text); border-bottom-color: var(--kb-yellow); }
.kb-header-bar { height: 3px; background: var(--kb-yellow); }

/* Main */
.container {
  max-width: 880px;
  margin: 0 auto;
  padding: 40px 24px 80px;
}

.back-link {
  display: inline-block;
  color: var(--kb-sub);
  text-decoration: none;
  font-size: 13px;
  font-weight: 500;
  margin-bottom: 16px;
  transition: color 0.15s;
}
.back-link:hover { color: var(--kb-text); }

.hero { margin-bottom: 36px; }
.hero-title {
  font-size: 32px;
  font-weight: 900;
  margin: 0 0 8px;
  letter-spacing: -0.5px;
}
.hero-sub { color: var(--kb-sub); margin: 0; font-size: 15px; }

/* Step */
.step { margin-bottom: 32px; }
.step-head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 16px;
}
.step-num {
  font-size: 12px;
  font-weight: 700;
  color: #7A5400;
  background: var(--kb-yellow-soft);
  padding: 4px 10px;
  border-radius: 999px;
  letter-spacing: 0.5px;
}
.step-title { font-size: 18px; font-weight: 700; margin: 0; }

/* Feature cards */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 16px;
}
.feature-card {
  background: var(--kb-white);
  border: 1px solid var(--kb-line);
  border-radius: var(--radius);
  padding: 24px 22px;
  cursor: pointer;
  transition: border-color 0.15s, transform 0.1s, box-shadow 0.15s;
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 10px;
  text-align: left;
  font-family: inherit;
  text-decoration: none;
  color: inherit;
}
.feature-card:hover {
  border-color: var(--kb-yellow);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}
.feature-card.selected {
  border-color: var(--kb-yellow);
  background: linear-gradient(180deg, #FFFCEF 0%, #FFFFFF 100%);
  box-shadow: 0 0 0 3px rgba(255, 188, 0, 0.18);
}
.feature-card .feature-icon {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: var(--kb-yellow-soft);
  color: #7A5400;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 4px;
}
.feature-card .feature-name {
  font-size: 17px;
  font-weight: 700;
  color: var(--kb-text);
  margin: 0;
}
.feature-card .feature-desc {
  font-size: 13px;
  color: var(--kb-sub);
  margin: 0;
  line-height: 1.55;
}
.feature-card .feature-code {
  margin-top: auto;
  font-size: 11px;
  color: var(--kb-muted);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

/* Form */
.upload-form {
  background: var(--kb-white);
  border: 1px solid var(--kb-line);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow-sm);
}
.selected-feature {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  background: var(--kb-yellow-soft);
  border-radius: 8px;
  margin-bottom: 24px;
  font-size: 14px;
}
.selected-label { color: #7A5400; font-weight: 600; font-size: 12px; }
.selected-value { font-weight: 700; color: var(--kb-text); }
.link-btn {
  margin-left: auto;
  background: none;
  border: none;
  color: #7A5400;
  font-size: 13px;
  cursor: pointer;
  font-family: inherit;
  text-decoration: underline;
}

.form-row { margin-bottom: 18px; }
.form-row label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--kb-text);
}
.required { color: var(--kb-danger); }
.form-row input[type="text"],
.form-row input[type="email"] {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--kb-line);
  border-radius: 8px;
  font-size: 14px;
  font-family: inherit;
  background: var(--kb-white);
  transition: border-color 0.15s, box-shadow 0.15s;
}
.form-row input:focus {
  outline: none;
  border-color: var(--kb-yellow);
  box-shadow: 0 0 0 3px rgba(255, 188, 0, 0.18);
}

/* File drop */
.file-drop {
  position: relative;
  border: 2px dashed var(--kb-line);
  border-radius: 10px;
  padding: 28px;
  text-align: center;
  background: #FAFAFA;
  transition: border-color 0.15s, background 0.15s;
  cursor: pointer;
}
.file-drop:hover, .file-drop.dragover {
  border-color: var(--kb-yellow);
  background: #FFFDF3;
}
.file-drop input[type="file"] {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  cursor: pointer;
}
.file-icon { color: var(--kb-muted); margin-bottom: 8px; }
.file-drop-text { margin: 0 0 4px; font-size: 14px; color: var(--kb-text); }
.file-drop-text strong { color: #7A5400; }
.file-drop-hint { margin: 0; font-size: 12px; color: var(--kb-muted); }
.file-drop.has-file .file-drop-hint { color: var(--kb-success); font-weight: 600; }

/* Preview */
.preview {
  margin: 18px 0;
  padding: 12px 14px;
  background: #F2F4F7;
  border-radius: 8px;
  font-size: 12px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.preview-label { color: var(--kb-muted); font-size: 11px; font-weight: 600; }
.preview code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  color: var(--kb-text);
  word-break: break-all;
}

/* Actions */
.form-actions { margin-top: 24px; }
.primary-btn {
  width: 100%;
  background: var(--kb-yellow);
  color: #1A1A1A;
  border: none;
  padding: 14px 20px;
  font-size: 15px;
  font-weight: 700;
  border-radius: 8px;
  cursor: pointer;
  font-family: inherit;
  transition: background 0.15s, transform 0.05s;
}
.primary-btn:hover:not(:disabled) { background: var(--kb-yellow-dark); }
.primary-btn:active:not(:disabled) { transform: translateY(1px); }
.primary-btn:disabled { background: #DDD; color: #999; cursor: not-allowed; }

/* Status */
.status { margin-top: 16px; font-size: 14px; min-height: 22px; }
.status.success { color: var(--kb-success); }
.status.error { color: var(--kb-danger); }
.status.info { color: var(--kb-sub); }

/* Footer */
.kb-footer {
  border-top: 1px solid var(--kb-line);
  padding: 24px;
  text-align: center;
  color: var(--kb-muted);
  font-size: 12px;
  background: var(--kb-white);
}
.kb-footer p { margin: 0; }

/* Mobile */
@media (max-width: 640px) {
  .hero-title { font-size: 24px; }
  .upload-form { padding: 20px; }
  .container { padding: 24px 16px 60px; }
}