/* ── Design tokens ─────────────────────────────────────────────── */
:root {
  --bg-top: #FAF4F1;
  --bg-bottom: #F5ECE8;
  --surface: #FFFFFF;
  --surface-soft: #FBF6F4;
  --border: #ECE0DB;
  --border-strong: #DDCFC9;
  --text: #2F2A28;
  --text-muted: #6E615C;
  --text-faint: #9A8B85;
  --accent: #B5838D;
  --accent-soft: #F5E6E0;
  --accent-hover: #A06F79;
  --success: #6B8F71;
  --danger: #C4756B;

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --shadow-sm: 0 1px 2px rgba(47, 42, 40, 0.04), 0 2px 6px rgba(47, 42, 40, 0.03);
  --shadow-md: 0 4px 12px rgba(47, 42, 40, 0.06), 0 10px 30px rgba(47, 42, 40, 0.04);
  --shadow-lg: 0 10px 40px rgba(47, 42, 40, 0.10);

  --transition: 180ms cubic-bezier(0.4, 0.0, 0.2, 1);
}

/* ── Reset & base ──────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }

body {
  font-family: "Pretendard", "Gowun Dodum", "Noto Sans KR", "Malgun Gothic",
               -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background:
    radial-gradient(1200px 600px at 15% -10%, #FDEBE3 0%, transparent 60%),
    radial-gradient(1000px 600px at 110% 10%, #F3E4EE 0%, transparent 55%),
    linear-gradient(180deg, var(--bg-top) 0%, var(--bg-bottom) 100%);
  min-height: 100vh;
  color: var(--text);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

button {
  font-family: inherit;
  border: 0;
  background: transparent;
  color: inherit;
  cursor: pointer;
}
input, select, label { font-family: inherit; color: inherit; }
h1, h2, h3, h4 { font-weight: 700; letter-spacing: -0.01em; }

/* ── Layout ────────────────────────────────────────────────────── */
.app {
  max-width: 980px;
  margin: 0 auto;
  padding: 48px 24px 96px;
}

.app__header {
  text-align: center;
  margin-bottom: 44px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 6px 14px 6px 10px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  box-shadow: var(--shadow-sm);
  margin-bottom: 18px;
}
.brand__mark {
  width: 28px; height: 28px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--accent) 0%, #D39AA2 100%);
  display: grid; place-items: center;
  color: #fff; font-weight: 800; font-size: 14px;
  box-shadow: inset 0 -2px 4px rgba(0,0,0,0.06);
}
.brand__text { font-weight: 700; font-size: 15px; letter-spacing: -0.01em; }

.app__title {
  font-size: 40px;
  margin: 0 0 10px;
  letter-spacing: -0.025em;
  background: linear-gradient(135deg, #3A2E2C 0%, var(--accent) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.app__subtitle {
  color: var(--text-muted);
  font-size: 15px;
  margin: 0;
}

/* ── Step card ─────────────────────────────────────────────────── */
.step {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  padding: 32px;
  margin-bottom: 24px;
  transition: opacity var(--transition), transform var(--transition);
}

.step.is-hidden { display: none; }

.step__head {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 20px;
}
.step__number {
  width: 32px; height: 32px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  display: grid; place-items: center;
  font-weight: 700;
  font-size: 14px;
  transition: background var(--transition), color var(--transition);
}
.step.is-complete .step__number {
  background: var(--accent);
  color: #fff;
}
.step__title { margin: 0; font-size: 19px; }
.step__desc { margin: 2px 0 0; color: var(--text-muted); font-size: 14px; }

/* ── Drop zone ─────────────────────────────────────────────────── */
.drop-zone {
  box-sizing: border-box;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  width: 100%;
  min-width: 0;
  min-height: 220px;
  border: 2px dashed var(--border-strong);
  border-radius: var(--radius-md);
  background: var(--surface-soft);
  color: var(--text-muted);
  padding: 32px;
  cursor: pointer;
  font: inherit;
  text-align: center;
  appearance: none;
  -webkit-appearance: none;
  transition: background var(--transition), border-color var(--transition),
              transform var(--transition);
}
.drop-zone:hover,
.drop-zone:focus-visible {
  background: #FFF;
  border-color: var(--accent);
  color: var(--text);
  outline: none;
  transform: translateY(-1px);
}
.drop-zone.is-dragover {
  background: var(--accent-soft);
  border-color: var(--accent);
  border-style: solid;
  color: var(--accent-hover);
}
.drop-zone__icon {
  width: 52px; height: 52px;
  border-radius: 14px;
  background: var(--accent-soft);
  color: var(--accent);
  display: grid; place-items: center;
  font-size: 24px;
}
.drop-zone__label { font-size: 16px; font-weight: 500; color: var(--text); }
.drop-zone__hint { font-size: 13px; color: var(--text-faint); }

/* ── Stat grid (card/deck counts) ──────────────────────────────── */
.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 12px;
  margin-top: 18px;
}
.stat {
  background: var(--surface-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 14px 16px;
}
.stat__label { font-size: 12px; color: var(--text-muted); letter-spacing: 0.02em; }
.stat__value { font-size: 22px; font-weight: 700; color: var(--text); margin-top: 4px; }

/* ── Section block within a step ───────────────────────────────── */
.section {
  margin-top: 28px;
}
.section + .section { border-top: 1px solid var(--border); padding-top: 28px; }
.section__title {
  font-size: 14px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin: 0 0 14px;
}

/* ── Field selector ────────────────────────────────────────────── */
.field-group {
  background: var(--surface-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 16px 18px;
  margin-bottom: 12px;
}
.field-group__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
}
.field-group__header h4 {
  display: inline;
  font-size: 15px;
  margin: 0;
}
.field-group__badge {
  display: inline-block;
  font-size: 11px;
  background: var(--accent-soft);
  color: var(--accent);
  padding: 2px 8px;
  border-radius: 999px;
  margin-left: 8px;
  vertical-align: middle;
  font-weight: 600;
  letter-spacing: 0.02em;
}
.field-group__count {
  font-size: 12px; color: var(--text-faint);
}
.field-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 6px;
}
.field-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 14px;
  transition: background var(--transition), border-color var(--transition);
}
.field-item:hover { background: #FDF8F6; }
.field-item input[type="checkbox"] {
  accent-color: var(--accent);
  width: 15px; height: 15px;
  cursor: pointer;
}
.field-item.is-question {
  background: var(--accent-soft);
  border-color: var(--accent-soft);
  cursor: default;
}
.field-item.is-question:hover { background: var(--accent-soft); }
.field-item__label { flex: 1; font-weight: 500; }
.field-item__role {
  font-size: 11px;
  padding: 2px 7px;
  background: var(--surface-soft);
  border-radius: 999px;
  color: var(--text-faint);
  font-weight: 600;
  letter-spacing: 0.02em;
}
.field-item.is-question .field-item__role {
  background: var(--accent);
  color: #fff;
}

/* ── Theme grid ────────────────────────────────────────────────── */
.theme-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(86px, 1fr));
  gap: 10px;
}
.theme-tile {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 10px 6px 8px;
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-md);
  transition: transform var(--transition), border-color var(--transition),
              box-shadow var(--transition), background var(--transition);
}
.theme-tile:hover {
  transform: translateY(-2px);
  border-color: var(--border-strong);
  box-shadow: var(--shadow-sm);
}
.theme-tile.is-active {
  border-color: var(--accent);
  background: var(--accent-soft);
  box-shadow: 0 0 0 3px rgba(181, 131, 141, 0.18);
}
.theme-swatch {
  position: relative;
  width: 100%; aspect-ratio: 1 / 1;
  border-radius: 10px;
  display: grid; place-items: center;
  overflow: hidden;
}
.theme-emoji { font-size: 22px; }
.theme-dot {
  position: absolute;
  right: 6px; bottom: 6px;
  width: 12px; height: 12px;
  border-radius: 999px;
  border: 2px solid #fff;
  box-shadow: 0 1px 2px rgba(0,0,0,0.1);
}
.theme-name {
  font-size: 12px;
  font-weight: 600;
  color: var(--text);
}

/* ── Form controls ─────────────────────────────────────────────── */
.form-row {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 16px;
  align-items: center;
  padding: 10px 0;
}
.form-row__label {
  font-size: 14px;
  color: var(--text-muted);
  font-weight: 500;
}

select {
  appearance: none;
  width: 100%;
  padding: 10px 36px 10px 12px;
  background: var(--surface);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  font-size: 14px;
  color: var(--text);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='none' stroke='%239A8B85' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round' d='M3 4.5L6 7.5L9 4.5'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  cursor: pointer;
  transition: border-color var(--transition), box-shadow var(--transition);
}
select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(181, 131, 141, 0.15);
}

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

.slider-row {
  display: flex; align-items: center; gap: 12px;
}
.slider-row__value {
  min-width: 44px;
  text-align: right;
  font-variant-numeric: tabular-nums;
  font-weight: 600;
  color: var(--accent);
  font-size: 14px;
}

.switch {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  font-size: 14px;
  color: var(--text);
}
.switch input { display: none; }
.switch__track {
  position: relative;
  width: 38px; height: 22px;
  background: var(--border-strong);
  border-radius: 999px;
  transition: background var(--transition);
}
.switch__track::after {
  content: "";
  position: absolute;
  top: 2px; left: 2px;
  width: 18px; height: 18px;
  background: #fff;
  border-radius: 999px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.2);
  transition: transform var(--transition);
}
.switch input:checked + .switch__track {
  background: var(--accent);
}
.switch input:checked + .switch__track::after {
  transform: translateX(16px);
}

/* ── Buttons ───────────────────────────────────────────────────── */
.action-bar {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 8px;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 22px;
  font-size: 14px;
  font-weight: 600;
  border-radius: 999px;
  transition: transform var(--transition), background var(--transition),
              box-shadow var(--transition), color var(--transition);
}
.btn:active { transform: translateY(1px); }
.btn--primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 2px 8px rgba(181, 131, 141, 0.35);
}
.btn--primary:hover {
  background: var(--accent-hover);
  box-shadow: 0 4px 14px rgba(181, 131, 141, 0.42);
}
.btn--ghost {
  background: var(--surface-soft);
  color: var(--text);
  border: 1px solid var(--border);
}
.btn--ghost:hover {
  background: var(--surface);
  border-color: var(--border-strong);
}
.btn--quiet {
  color: var(--text-muted);
}
.btn--quiet:hover { color: var(--text); }
.btn__icon { font-size: 16px; line-height: 0; }

/* ── Preview ───────────────────────────────────────────────────── */
.preview-wrap {
  margin-top: 28px;
  padding-top: 28px;
  border-top: 1px solid var(--border);
}
.preview-wrap__title {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
}
.preview-wrap__title h3 {
  margin: 0;
  font-size: 16px;
}
.preview-wrap__hint {
  font-size: 12px; color: var(--text-faint);
}
#preview {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  padding: 24px;
  max-height: 70vh;
  overflow-y: auto;
}
#preview:empty::before {
  content: "파일을 업로드하면 미리보기가 표시됩니다.";
  display: block;
  color: var(--text-faint);
  font-size: 14px;
  text-align: center;
  padding: 40px 0;
}

/* ── Footer ────────────────────────────────────────────────────── */
.app__footer {
  text-align: center;
  color: var(--text-faint);
  font-size: 12px;
  margin-top: 48px;
}
.app__footer a { color: var(--accent); text-decoration: none; }
.app__footer a:hover { text-decoration: underline; }

/* ── Toast ─────────────────────────────────────────────────────── */
.toast {
  position: fixed;
  left: 50%;
  bottom: 28px;
  transform: translate(-50%, 20px);
  background: #2F2A28;
  color: #fff;
  padding: 12px 20px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 500;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition), transform var(--transition);
  box-shadow: var(--shadow-lg);
  z-index: 1000;
}
.toast.is-visible {
  opacity: 1;
  transform: translate(-50%, 0);
}
.toast--success { background: var(--success); }
.toast--error { background: var(--danger); }

/* ── Loading overlay ───────────────────────────────────────────── */
.loading {
  position: fixed;
  inset: 0;
  background: rgba(47, 42, 40, 0.32);
  backdrop-filter: blur(4px);
  display: grid;
  place-items: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition);
  z-index: 2000;
}
.loading.is-visible { opacity: 1; pointer-events: auto; }
.loading__card {
  background: var(--surface);
  padding: 26px 32px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: 14px;
}
.loading__spinner {
  width: 22px; height: 22px;
  border: 2.5px solid var(--accent-soft);
  border-top-color: var(--accent);
  border-radius: 999px;
  animation: spin 0.7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.loading__text {
  font-size: 14px;
  font-weight: 500;
  color: var(--text);
}

/* ── Responsive ────────────────────────────────────────────────── */
@media (max-width: 640px) {
  .app { padding: 32px 16px 64px; }
  .app__title { font-size: 30px; }
  .step { padding: 24px 20px; }
  .form-row { grid-template-columns: 1fr; gap: 8px; }
  .form-row__label { font-size: 12px; }
}