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

:root {
  --bg: #F5F5F7;
  --surface: #FFFFFF;
  --surface-2: #F5F5F7;
  --border: rgba(0,0,0,0.08);
  --border-strong: rgba(0,0,0,0.14);
  --text: #1D1D1F;
  --text-2: #6E6E73;
  --text-3: #AEAEB2;
  --accent: #007AFF;
  --accent-light: #E8F1FF;
  --accent-dark: #0051D5;
  --green: #34C759;
  --green-light: #E6F9EC;
  --pink: #FF2D55;
  --pink-light: #FFEBEF;
  --orange: #FF9500;
  --orange-light: #FFF4E5;
  --radius-sm: 8px;
  --radius: 12px;
  --radius-lg: 18px;
  --radius-xl: 22px;
  --shadow-sm: 0 1px 4px rgba(0,0,0,0.06), 0 0 1px rgba(0,0,0,0.04);
  --shadow: 0 4px 16px rgba(0,0,0,0.08), 0 1px 4px rgba(0,0,0,0.04);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.12), 0 2px 8px rgba(0,0,0,0.06);
}

html { font-size: 16px; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.5;
}

/* ── Layout ── */
.container {
  max-width: 860px;
  margin: 0 auto;
  padding: 52px 20px 80px;
}

/* ── Header ── */
.header { margin-bottom: 40px; }

.header-top {
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  margin-bottom: 14px;
}

.btn-logout {
  position: absolute;
  right: 0;
  background: rgba(0,0,0,0.05);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-2);
  font-family: inherit;
  font-size: 0.78rem;
  font-weight: 500;
  padding: 5px 12px;
  cursor: pointer;
  transition: all 0.15s;
}

.btn-logout:hover {
  background: var(--pink-light);
  color: var(--pink);
  border-color: rgba(255,45,85,0.2);
}

.header { text-align: center; }

.badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  background: var(--accent-light);
  color: var(--accent);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 5px 12px;
  border-radius: 100px;
  margin-bottom: 16px;
}

h1 {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--text);
  line-height: 1.1;
  margin-bottom: 10px;
}

.subtitle {
  color: var(--text-2);
  font-size: 0.95rem;
  font-weight: 400;
}

/* ── Stats Bar ── */
.stats-bar {
  display: flex;
  background: var(--surface);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow);
  margin-bottom: 20px;
  overflow: hidden;
}

.stat {
  flex: 1;
  padding: 20px 16px;
  text-align: center;
  position: relative;
}

.stat + .stat::before {
  content: '';
  position: absolute;
  left: 0; top: 20%; bottom: 20%;
  width: 1px;
  background: var(--border);
}

.stat-num {
  display: block;
  font-size: 1.9rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--accent);
  line-height: 1;
  margin-bottom: 4px;
  font-variant-numeric: tabular-nums;
}

.stat-label {
  font-size: 0.7rem;
  color: var(--text-3);
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

/* ── Control Panel ── */
.control-panel {
  background: var(--surface);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow);
  padding: 24px;
  margin-bottom: 20px;
}

.controls-row {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 20px;
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
  flex: 1;
  min-width: 130px;
}

label {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--text-2);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.select-wrapper { position: relative; }

select {
  width: 100%;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-family: inherit;
  font-size: 0.9rem;
  font-weight: 500;
  padding: 10px 32px 10px 12px;
  appearance: none;
  cursor: pointer;
  outline: none;
  transition: border-color 0.15s, box-shadow 0.15s;
}

select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(0,122,255,0.15);
}

.select-arrow {
  position: absolute;
  right: 10px; top: 50%;
  transform: translateY(-50%);
  color: var(--text-3);
  font-size: 0.7rem;
  pointer-events: none;
}

.age-range { display: flex; align-items: center; gap: 6px; }

.age-range input {
  flex: 1; min-width: 0;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-family: inherit;
  font-size: 0.9rem;
  font-weight: 500;
  padding: 10px 8px;
  text-align: center;
  outline: none;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.age-range input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(0,122,255,0.15);
}

.age-sep { color: var(--text-3); font-size: 0.85rem; }
.age-unit { color: var(--text-3); font-size: 0.82rem; flex-shrink: 0; }

/* ── Buttons ── */
.btn-row { display: flex; gap: 10px; flex-wrap: wrap; }

.btn-generate {
  flex: 1; min-width: 180px;
  background: var(--accent);
  border: none;
  border-radius: var(--radius);
  color: #fff;
  font-family: inherit;
  font-size: 0.95rem;
  font-weight: 600;
  padding: 14px 24px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  letter-spacing: -0.01em;
  transition: background 0.15s, transform 0.1s, box-shadow 0.15s;
  box-shadow: 0 2px 8px rgba(0,122,255,0.35);
}

.btn-generate:hover {
  background: var(--accent-dark);
  box-shadow: 0 4px 16px rgba(0,122,255,0.4);
  transform: translateY(-1px);
}

.btn-generate:active { transform: scale(0.98); box-shadow: none; }
.btn-icon { font-size: 1rem; }

.btn-secondary {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-2);
  font-family: inherit;
  font-size: 0.85rem;
  font-weight: 500;
  padding: 12px 18px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 5px;
  transition: all 0.15s;
  white-space: nowrap;
}

.btn-secondary:hover {
  background: #EBEBED;
  color: var(--text);
  border-color: var(--border-strong);
}

.btn-danger:hover {
  background: var(--pink-light);
  color: var(--pink);
  border-color: rgba(255,45,85,0.2);
}

/* ── Results ── */
.results-wrapper {
  background: var(--surface);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.results-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 18px;
  border-bottom: 1px solid var(--border);
  background: var(--surface-2);
}

.results-header span {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-2);
}

.results-actions { display: flex; gap: 6px; }

.icon-btn {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-2);
  font-family: inherit;
  font-size: 0.75rem;
  font-weight: 500;
  padding: 5px 10px;
  cursor: pointer;
  transition: all 0.15s;
}

.icon-btn:hover {
  background: var(--accent-light);
  color: var(--accent);
  border-color: rgba(0,122,255,0.2);
}

.results-list {
  max-height: 540px;
  overflow-y: auto;
  padding: 10px;
  scrollbar-width: thin;
  scrollbar-color: rgba(0,0,0,0.12) transparent;
}

.results-list::-webkit-scrollbar { width: 4px; }
.results-list::-webkit-scrollbar-thumb { background: rgba(0,0,0,0.12); border-radius: 4px; }

/* Empty State */
.empty-state { padding: 64px 20px; text-align: center; }
.empty-icon { font-size: 2.8rem; margin-bottom: 14px; }
.empty-state p { color: var(--text-2); font-size: 0.9rem; margin-bottom: 6px; }
.empty-hint { color: var(--text-3) !important; font-size: 0.78rem !important; }

/* ID Grid */
.id-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
  gap: 5px;
}

.id-card {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 10px 13px;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, box-shadow 0.15s, transform 0.1s;
  animation: fadeUp 0.25s ease both;
}

.id-card:hover {
  background: var(--surface-2);
  border-color: var(--border-strong);
  box-shadow: var(--shadow-sm);
  transform: translateY(-1px);
}

.id-card:active { transform: scale(0.99); }

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: translateY(0); }
}

.id-index {
  font-size: 0.68rem;
  color: var(--text-3);
  font-variant-numeric: tabular-nums;
  min-width: 26px;
  text-align: right;
  flex-shrink: 0;
}

.id-number {
  flex: 1;
  font-family: "SF Mono", "JetBrains Mono", "Fira Code", monospace;
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--text);
}

.seg-region { color: var(--accent); }
.seg-date   { color: var(--green); }
.seg-seq    { color: var(--orange); }
.seg-check  { color: var(--pink); font-weight: 700; }

.id-meta { display: flex; align-items: center; gap: 6px; flex-shrink: 0; }

.tag {
  font-size: 0.65rem;
  font-weight: 600;
  padding: 2px 7px;
  border-radius: 4px;
  letter-spacing: 0.02em;
}

.tag-male   { background: var(--accent-light); color: var(--accent); }
.tag-female { background: var(--pink-light);   color: var(--pink);   }

.copy-btn {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-3);
  font-size: 0.9rem;
  padding: 3px 5px;
  border-radius: 5px;
  transition: color 0.15s, background 0.15s;
  line-height: 1;
}

.copy-btn:hover { color: var(--accent); background: var(--accent-light); }

/* Batch Divider */
.batch-divider {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 4px;
  grid-column: 1/-1;
}

.batch-divider::before, .batch-divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border);
}

.batch-label {
  font-size: 0.68rem;
  font-weight: 600;
  color: var(--text-3);
  letter-spacing: 0.07em;
  text-transform: uppercase;
  white-space: nowrap;
}

/* Toast */
.toast {
  position: fixed;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%) translateY(16px);
  background: rgba(29,29,31,0.92);
  color: #fff;
  padding: 11px 22px;
  border-radius: 100px;
  font-size: 0.85rem;
  font-weight: 500;
  opacity: 0;
  pointer-events: none;
  transition: all 0.28s cubic-bezier(0.34,1.56,0.64,1);
  z-index: 9999;
  backdrop-filter: blur(20px);
  white-space: nowrap;
  box-shadow: 0 8px 30px rgba(0,0,0,0.2);
}

.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* Footer */
.footer { text-align: center; margin-top: 32px; }
.footer p { font-size: 0.75rem; color: var(--text-3); }

/* Responsive */
@media (max-width: 580px) {
  .controls-row { flex-direction: column; }
  .id-grid { grid-template-columns: 1fr; }
  .stats-bar { flex-wrap: wrap; }
  .stat { min-width: 50%; }
  .stat + .stat::before { display: none; }
  .btn-generate { min-width: 0; }
}