/* ============================================
   PackSmart — style.css
   Palette: Navy #1B2A4A · Gold #D4A853 · Cream #F7F4EF · White #FFFFFF
   ============================================ */

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

:root {
  --navy:   #1B2A4A;
  --navy-2: #243558;
  --gold:   #D4A853;
  --gold-l: #F0CB7A;
  --cream:  #F7F4EF;
  --white:  #FFFFFF;
  --gray-1: #F0EDE8;
  --gray-2: #D9D5CF;
  --gray-3: #9B9591;
  --gray-4: #6B6763;
  --green:  #2E8B57;
  --red:    #C0392B;
  --shadow: 0 2px 12px rgba(27,42,74,0.10);
  --radius: 12px;
  --radius-s: 8px;
  --font: 'Inter', 'Noto Sans SC', sans-serif;
  --transition: 0.18s ease;
}

html { font-size: 16px; }
body {
  font-family: var(--font);
  background: var(--cream);
  color: var(--navy);
  min-height: 100vh;
}

/* ── HEADER ── */
.header {
  background: var(--navy);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 16px rgba(0,0,0,0.18);
}
.header-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
  height: 64px;
  display: flex;
  align-items: center;
  gap: 24px;
}
.logo { display: flex; align-items: center; gap: 10px; text-decoration: none; }
.logo-icon { font-size: 1.5rem; }
.logo-text { font-size: 1.2rem; font-weight: 700; color: var(--white); letter-spacing: 0.02em; }

.nav-tabs { display: flex; gap: 4px; flex: 1; }
.nav-btn {
  background: none;
  border: none;
  color: rgba(255,255,255,0.6);
  font-family: var(--font);
  font-size: 0.9rem;
  font-weight: 500;
  padding: 8px 16px;
  border-radius: var(--radius-s);
  cursor: pointer;
  transition: var(--transition);
}
.nav-btn:hover { color: var(--white); background: rgba(255,255,255,0.08); }
.nav-btn.active { color: var(--gold); background: rgba(212,168,83,0.15); }

/* ── BUTTONS ── */
.btn-primary {
  background: var(--gold);
  color: var(--navy);
  border: none;
  font-family: var(--font);
  font-size: 0.9rem;
  font-weight: 600;
  padding: 9px 20px;
  border-radius: var(--radius-s);
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
}
.btn-primary:hover { background: var(--gold-l); }

.btn-ghost {
  background: none;
  color: var(--gray-4);
  border: 1.5px solid var(--gray-2);
  font-family: var(--font);
  font-size: 0.9rem;
  font-weight: 500;
  padding: 8px 18px;
  border-radius: var(--radius-s);
  cursor: pointer;
  transition: var(--transition);
}
.btn-ghost:hover { border-color: var(--navy); color: var(--navy); }

.btn-ai {
  background: linear-gradient(135deg, #3b2d7a 0%, #6c4de0 100%);
  color: var(--white);
  border: none;
  font-family: var(--font);
  font-size: 0.95rem;
  font-weight: 600;
  padding: 11px 24px;
  border-radius: var(--radius-s);
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: 8px;
}
.btn-ai:hover { opacity: 0.9; transform: translateY(-1px); }
.btn-ai:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }
.ai-icon { font-size: 1.1rem; }

/* ── MAIN ── */
.main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 32px 24px 60px;
}

/* ── TABS ── */
.tab-content { display: none; }
.tab-content.active { display: block; }

/* ── STATS ── */
.stats-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-bottom: 28px;
}
.stat-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 20px 24px;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  gap: 4px;
  border-top: 3px solid var(--gray-2);
}
.stat-card.purchased { border-top-color: var(--green); }
.stat-card.pending   { border-top-color: var(--gold); }
.stat-num { font-size: 2rem; font-weight: 700; color: var(--navy); }
.stat-label { font-size: 0.82rem; color: var(--gray-3); font-weight: 500; }

/* ── FILTER ROW ── */
.filter-row {
  display: flex;
  gap: 12px;
  align-items: center;
  margin-bottom: 28px;
  flex-wrap: wrap;
}
.search-wrap { flex: 1; min-width: 180px; }
.search-input, .select {
  width: 100%;
  border: 1.5px solid var(--gray-2);
  border-radius: var(--radius-s);
  padding: 9px 14px;
  font-family: var(--font);
  font-size: 0.9rem;
  color: var(--navy);
  background: var(--white);
  transition: var(--transition);
  outline: none;
}
.search-input:focus, .select:focus { border-color: var(--navy); }

.filter-chips { display: flex; gap: 6px; }
.chip {
  background: var(--white);
  border: 1.5px solid var(--gray-2);
  color: var(--gray-4);
  font-family: var(--font);
  font-size: 0.85rem;
  font-weight: 500;
  padding: 7px 14px;
  border-radius: 20px;
  cursor: pointer;
  transition: var(--transition);
}
.chip.active { background: var(--navy); border-color: var(--navy); color: var(--white); }
.chip:hover:not(.active) { border-color: var(--navy); color: var(--navy); }

.category-filter { min-width: 140px; }

/* ── ITEMS GRID ── */
.items-grid { display: flex; flex-direction: column; gap: 24px; }

.category-group {}
.category-title {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--gray-3);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.category-title::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--gray-2);
}

.items-row {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 12px;
}

.item-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 16px;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: var(--transition);
  border: 1.5px solid transparent;
  position: relative;
}
.item-card:hover { border-color: var(--gold); transform: translateY(-2px); }
.item-card.purchased { border-left: 4px solid var(--green); }
.item-card.pending   { border-left: 4px solid var(--gold); }

.item-card-top { display: flex; justify-content: space-between; align-items: flex-start; }
.item-name { font-size: 1rem; font-weight: 600; color: var(--navy); }
.item-qty { font-size: 0.8rem; background: var(--gray-1); color: var(--gray-4); padding: 2px 8px; border-radius: 10px; }

.item-note { font-size: 0.82rem; color: var(--gray-3); min-height: 18px; }

.item-card-bottom { display: flex; justify-content: space-between; align-items: center; }
.purchase-badge {
  font-size: 0.78rem;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 10px;
}
.purchase-badge.purchased { background: #e8f5ee; color: var(--green); }
.purchase-badge.pending   { background: #fdf4e1; color: #b8880a; }

.item-actions { display: flex; gap: 4px; }
.icon-btn {
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px 7px;
  border-radius: 6px;
  font-size: 0.85rem;
  color: var(--gray-3);
  transition: var(--transition);
}
.icon-btn:hover { background: var(--gray-1); color: var(--navy); }
.icon-btn.toggle-purchase { color: var(--green); }

/* ── CHECKLIST ── */
.checklist-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 24px;
}
.checklist-actions { display: flex; gap: 10px; }
.section-title { font-size: 1.5rem; font-weight: 700; color: var(--navy); }
.section-sub { font-size: 0.9rem; color: var(--gray-3); margin-top: 4px; }

.progress-bar-wrap { margin-bottom: 28px; }
.progress-info { display: flex; justify-content: space-between; font-size: 0.85rem; color: var(--gray-4); margin-bottom: 8px; font-weight: 500; }
.progress-bar { background: var(--gray-1); border-radius: 6px; height: 8px; overflow: hidden; }
.progress-fill { background: linear-gradient(90deg, var(--green), #52c985); height: 100%; border-radius: 6px; transition: width 0.4s ease; }

.checklist-groups { display: flex; flex-direction: column; gap: 24px; }
.checklist-group {}
.checklist-group-title {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--gray-3);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.checklist-group-title::after { content: ''; flex: 1; height: 1px; background: var(--gray-2); }

.checklist-item {
  background: var(--white);
  border-radius: var(--radius-s);
  padding: 14px 18px;
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 8px;
  box-shadow: 0 1px 6px rgba(27,42,74,0.07);
  transition: var(--transition);
  cursor: pointer;
}
.checklist-item:hover { background: var(--gray-1); }
.checklist-item.checked { opacity: 0.55; }
.checklist-item.checked .checklist-name { text-decoration: line-through; color: var(--gray-3); }

.checklist-box {
  width: 22px;
  height: 22px;
  border: 2px solid var(--gray-2);
  border-radius: 6px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}
.checklist-item.checked .checklist-box {
  background: var(--green);
  border-color: var(--green);
  color: var(--white);
  font-size: 0.8rem;
}
.checklist-name { font-size: 0.95rem; font-weight: 500; flex: 1; }
.checklist-qty { font-size: 0.82rem; color: var(--gray-3); }
.checklist-note { font-size: 0.8rem; color: var(--gray-3); font-style: italic; }

/* ── AI SECTION ── */
.ai-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 28px;
}
.ai-result-area {
  background: var(--white);
  border-radius: var(--radius);
  padding: 32px;
  box-shadow: var(--shadow);
  min-height: 300px;
}
.ai-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  min-height: 260px;
  color: var(--gray-3);
  text-align: center;
  line-height: 1.7;
}
.ai-placeholder-icon { font-size: 3rem; }

.ai-loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  min-height: 260px;
  color: var(--gray-3);
}
.spinner {
  width: 40px; height: 40px;
  border: 3px solid var(--gray-2);
  border-top-color: #6c4de0;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.ai-content { line-height: 1.75; color: var(--navy); }
.ai-content h3 { font-size: 1.1rem; font-weight: 700; margin: 20px 0 10px; color: var(--navy); }
.ai-content h3:first-child { margin-top: 0; }
.ai-content p { margin-bottom: 10px; }
.ai-content ul { padding-left: 22px; margin-bottom: 12px; }
.ai-content li { margin-bottom: 5px; }
.ai-content strong { color: var(--navy); }
.ai-section {
  background: var(--cream);
  border-radius: var(--radius-s);
  padding: 16px 20px;
  margin-bottom: 16px;
  border-left: 4px solid var(--gold);
}
.ai-section-title {
  font-weight: 700;
  font-size: 1rem;
  color: var(--navy);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.ai-section-body { font-size: 0.92rem; color: var(--gray-4); line-height: 1.7; }
.ai-tip {
  background: #f0ecfe;
  border-radius: var(--radius-s);
  padding: 12px 16px;
  margin-top: 20px;
  font-size: 0.88rem;
  color: #4a35a8;
  border-left: 4px solid #6c4de0;
}

/* ── MODAL ── */
.modal-overlay {
  position: fixed; inset: 0;
  background: rgba(27,42,74,0.5);
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}
.modal-overlay.hidden { display: none; }
.modal {
  background: var(--white);
  border-radius: var(--radius);
  width: 100%;
  max-width: 460px;
  box-shadow: 0 8px 40px rgba(27,42,74,0.25);
}
.modal-header {
  padding: 20px 24px 16px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--gray-1);
}
.modal-header h3 { font-size: 1.1rem; font-weight: 700; }
.modal-close {
  background: none; border: none; font-size: 1rem;
  cursor: pointer; color: var(--gray-3); padding: 4px 8px;
  border-radius: 6px; transition: var(--transition);
}
.modal-close:hover { background: var(--gray-1); color: var(--navy); }
.modal-body { padding: 20px 24px; display: flex; flex-direction: column; gap: 14px; }
.form-label { font-size: 0.85rem; font-weight: 600; color: var(--gray-4); }
.form-input {
  border: 1.5px solid var(--gray-2);
  border-radius: var(--radius-s);
  padding: 10px 14px;
  font-family: var(--font);
  font-size: 0.95rem;
  color: var(--navy);
  background: var(--white);
  width: 100%;
  outline: none;
  transition: var(--transition);
}
.form-input:focus { border-color: var(--navy); }
.radio-group { display: flex; gap: 20px; }
.radio-label { display: flex; align-items: center; gap: 7px; font-size: 0.9rem; cursor: pointer; }
.modal-footer { padding: 16px 24px 20px; display: flex; justify-content: flex-end; gap: 10px; border-top: 1px solid var(--gray-1); }

/* ── TOAST ── */
.toast {
  position: fixed;
  bottom: 32px; left: 50%;
  transform: translateX(-50%);
  background: var(--navy);
  color: var(--white);
  padding: 12px 24px;
  border-radius: 24px;
  font-size: 0.9rem;
  font-weight: 500;
  z-index: 999;
  box-shadow: 0 4px 20px rgba(0,0,0,0.2);
  transition: opacity 0.3s ease;
}
.toast.hidden { display: none; }

/* ── EMPTY STATE ── */
.empty-state {
  text-align: center;
  padding: 60px 24px;
  color: var(--gray-3);
}
.empty-state p { margin-top: 8px; font-size: 0.9rem; }

/* ── RESPONSIVE ── */
@media (max-width: 700px) {
  .stats-row { grid-template-columns: repeat(2, 1fr); }
  .header-inner { gap: 12px; }
  .nav-btn { padding: 7px 10px; font-size: 0.82rem; }
  .checklist-header { flex-direction: column; gap: 12px; }
  .ai-header { flex-direction: column; gap: 16px; }
}
@media (max-width: 480px) {
  .main { padding: 20px 16px 60px; }
  .logo-text { display: none; }
  .nav-tabs { gap: 2px; }
}