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

:root {
  --bg: #f5f7fa;
  --surface: #ffffff;
  --surface2: #f0f2f7;
  --border: #dde1eb;
  --text: #1a1d2e;
  --text-muted: #6b7280;
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --success: #16a34a;
  --warning: #d97706;
  --danger: #dc2626;
  --line-green: #06c755;
  --line-green-hover: #05b04d;
  --radius: 10px;
  --radius-sm: 6px;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Sarabun', 'Noto Sans Thai', sans-serif;
  font-size: 14px;
  line-height: 1.5;
  min-height: 100vh;
}

a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ── Typography ──────────────────────────────────────────────────────────── */
h1 { font-size: 1.5rem; font-weight: 700; }
h2 { font-size: 1.25rem; font-weight: 600; }
h3 { font-size: 1.1rem; font-weight: 600; }

/* ── Layout ──────────────────────────────────────────────────────────────── */
.container { max-width: 1400px; margin: 0 auto; padding: 0 1rem; }

/* ── Header ──────────────────────────────────────────────────────────────── */
.header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 0.75rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--text);
}

.header-brand .logo { font-size: 1.4rem; }

.header-nav {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.header-nav a {
  padding: 0.4rem 0.8rem;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  font-weight: 500;
  transition: background 0.15s, color 0.15s;
}

.header-nav a:hover, .header-nav a.active {
  background: var(--surface2);
  color: var(--text);
  text-decoration: none;
}

.header-user {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.user-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--border);
}

.user-avatar-placeholder {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--surface2);
  border: 2px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.btn-logout {
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text-muted);
  border: 1px solid var(--border);
  cursor: pointer;
  font-size: 0.8rem;
  transition: all 0.15s;
}

.btn-logout:hover {
  background: var(--danger);
  border-color: var(--danger);
  color: white;
}

/* ── Cards / Summary ─────────────────────────────────────────────────────── */
.cards-row {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 1.25rem;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
  flex: 1;
  min-width: 160px;
}

.card-label {
  font-size: 0.78rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 0.4rem;
}

.card-value {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text);
}

.card.ok .card-value { color: var(--success); }
.card.warn .card-value { color: var(--warning); }
.card.danger .card-value { color: var(--danger); }
.card.primary .card-value { color: var(--primary); }

/* ── Filters bar ─────────────────────────────────────────────────────────── */
.filters {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.75rem 1rem;
  margin-bottom: 1rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
}

.filters input[type="text"],
.filters select {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  padding: 0.4rem 0.7rem;
  font-size: 0.85rem;
  outline: none;
  transition: border-color 0.15s;
}

.filters input[type="text"]:focus,
.filters select:focus {
  border-color: var(--primary);
}

.filters input[type="text"] { width: 200px; }

.btn-stock {
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--surface2);
  color: var(--text-muted);
  cursor: pointer;
  font-size: 0.8rem;
  transition: all 0.15s;
}

.btn-stock:hover { border-color: var(--primary); color: var(--primary); }
.btn-stock.active-filter { background: var(--primary); border-color: var(--primary); color: white; }
.btn-stock.active-filter.warn { background: var(--warning); border-color: var(--warning); color: #000; }
.btn-stock.active-filter.danger { background: var(--danger); border-color: var(--danger); color: white; }
.btn-stock.active-filter.ok { background: var(--success); border-color: var(--success); color: #000; }

/* ── Tabs ────────────────────────────────────────────────────────────────── */
.tabs {
  display: flex;
  gap: 0.25rem;
  margin-bottom: 1rem;
  border-bottom: 1px solid var(--border);
}

.tab-btn {
  padding: 0.5rem 1rem;
  border: none;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 0.9rem;
  border-bottom: 2px solid transparent;
  transition: all 0.15s;
  position: relative;
  bottom: -1px;
}

.tab-btn:hover { color: var(--text); }
.tab-btn.active { color: var(--primary); border-bottom-color: var(--primary); }

/* ── Table ───────────────────────────────────────────────────────────────── */
.table-wrap {
  overflow-x: auto;
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}

thead th {
  background: var(--surface);
  padding: 0.6rem 0.75rem;
  text-align: left;
  font-weight: 600;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}

tbody tr {
  border-bottom: 1px solid var(--border);
  transition: background 0.1s;
}

tbody tr:hover { background: var(--surface2); }
tbody tr:last-child { border-bottom: none; }

tbody td {
  padding: 0.5rem 0.75rem;
  vertical-align: middle;
}

/* ── Stock indicator ─────────────────────────────────────────────────────── */
.stock-num { font-weight: 600; font-variant-numeric: tabular-nums; }
.stock-ok { color: var(--success); }
.stock-low { color: var(--warning); }
.stock-zero { color: var(--danger); }

/* ── Badges ──────────────────────────────────────────────────────────────── */
.badge {
  display: inline-block;
  padding: 0.15rem 0.45rem;
  border-radius: 4px;
  font-size: 0.7rem;
  font-weight: 600;
  line-height: 1.4;
}

.badge-cat1 { background: #dbeafe; color: #1d4ed8; }
.badge-cat2 { background: #ccfbf1; color: #0f766e; }
.badge-tag { background: #ffedd5; color: #c2410c; }
.badge-variant { background: #f3e8ff; color: #7c3aed; }
.badge-at31 { background: #dcfce7; color: #15803d; font-family: monospace; }
.badge-at31-invalid { background: #fee2e2; color: var(--danger); font-family: monospace; }
.badge-at31-none { background: var(--surface2); color: var(--text-muted); }

/* ── Collapsible group row ───────────────────────────────────────────────── */
.group-row {
  cursor: pointer;
  background: #eef2ff;
  user-select: none;
}

.group-row:hover { background: var(--surface2); }

.group-row td { font-weight: 600; }

.group-toggle { font-size: 0.75rem; color: var(--text-muted); margin-right: 0.5rem; }

.child-row { background: transparent; }
.child-row td:first-child { padding-left: 2rem; }

/* ── Login page ──────────────────────────────────────────────────────────── */
.login-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg);
  padding: 1rem;
}

.login-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2.5rem 2rem;
  width: 100%;
  max-width: 380px;
  text-align: center;
}

.login-logo {
  font-size: 2.5rem;
  margin-bottom: 0.5rem;
}

.login-title {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.login-subtitle {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 2rem;
}

.btn-line {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  width: 100%;
  padding: 0.85rem 1.5rem;
  background: var(--line-green);
  color: white;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  transition: background 0.15s;
}

.btn-line:hover { background: var(--line-green-hover); color: white; text-decoration: none; }

.line-icon {
  width: 22px;
  height: 22px;
}

.error-box {
  background: #fee2e2;
  border: 1px solid var(--danger);
  border-radius: var(--radius-sm);
  padding: 0.75rem 1rem;
  color: #991b1b;
  font-size: 0.875rem;
  margin-bottom: 1.25rem;
  text-align: left;
}

.invite-box {
  background: #dcfce7;
  border: 1px solid var(--success);
  border-radius: var(--radius-sm);
  padding: 0.75rem 1rem;
  color: #15803d;
  font-size: 0.875rem;
  margin-bottom: 1.25rem;
  text-align: left;
}

/* ── Buttons ─────────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.45rem 0.9rem;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  font-size: 0.85rem;
  font-weight: 500;
  transition: all 0.15s;
  white-space: nowrap;
}

.btn-primary { background: var(--primary); color: white; }
.btn-primary:hover { background: var(--primary-hover); }
.btn-success { background: var(--success); color: #000; }
.btn-success:hover { background: #16a34a; }
.btn-danger { background: transparent; border-color: var(--danger); color: var(--danger); }
.btn-danger:hover { background: var(--danger); color: white; }
.btn-secondary { background: var(--surface2); border-color: var(--border); color: var(--text); }
.btn-secondary:hover { border-color: var(--primary); color: var(--primary); }
.btn-sm { padding: 0.3rem 0.6rem; font-size: 0.78rem; }

/* ── Form elements ───────────────────────────────────────────────────────── */
.form-group { margin-bottom: 1rem; }
.form-label { display: block; margin-bottom: 0.35rem; font-size: 0.85rem; color: var(--text-muted); }

.form-control {
  width: 100%;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  padding: 0.5rem 0.75rem;
  font-size: 0.875rem;
  outline: none;
  transition: border-color 0.15s;
}

.form-control:focus { border-color: var(--primary); }

/* ── Modal ───────────────────────────────────────────────────────────────── */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 1rem;
}

.modal {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  width: 100%;
  max-width: 480px;
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}

.modal-close {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 1.2rem;
  padding: 0.25rem;
}

/* ── Admin page ──────────────────────────────────────────────────────────── */
.section {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  margin-bottom: 1.5rem;
}

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}

.toggle-switch {
  position: relative;
  display: inline-block;
  width: 40px;
  height: 22px;
}

.toggle-switch input { display: none; }

.toggle-slider {
  position: absolute;
  inset: 0;
  background: var(--border);
  border-radius: 11px;
  cursor: pointer;
  transition: background 0.2s;
}

.toggle-slider::before {
  content: "";
  position: absolute;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: white;
  top: 3px;
  left: 3px;
  transition: transform 0.2s;
}

.toggle-switch input:checked + .toggle-slider { background: var(--success); }
.toggle-switch input:checked + .toggle-slider::before { transform: translateX(18px); }

/* ── Invite card ─────────────────────────────────────────────────────────── */
.invite-row {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.75rem 1rem;
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
  gap: 1rem;
}

.invite-info { flex: 1; }
.invite-link { font-family: monospace; font-size: 0.78rem; color: var(--text-muted); word-break: break-all; }
.invite-note { font-weight: 500; margin-bottom: 0.25rem; }
.invite-meta { font-size: 0.75rem; color: var(--text-muted); }

.badge-used { background: #fef9c3; color: #a16207; }
.badge-pending { background: #dcfce7; color: #15803d; }

/* ── PO page ─────────────────────────────────────────────────────────────── */
.po-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}

.quantity-input {
  width: 70px;
  text-align: center;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  padding: 0.3rem 0.5rem;
  font-size: 0.85rem;
}

.quantity-input:focus { border-color: var(--primary); outline: none; }
.quantity-input:disabled { opacity: 0.3; }

/* ── Movement page ───────────────────────────────────────────────────────── */
.snapshot-selectors {
  display: flex;
  gap: 1rem;
  margin-bottom: 1.25rem;
  flex-wrap: wrap;
}

.snapshot-selector {
  flex: 1;
  min-width: 200px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem;
}

.delta-positive { color: var(--success); font-weight: 600; }
.delta-negative { color: var(--danger); font-weight: 600; }
.delta-zero { color: var(--text-muted); }

/* ── Scrollbar ───────────────────────────────────────────────────────────── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

/* ── Toast ───────────────────────────────────────────────────────────────── */
.toast-container {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.toast {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.75rem 1rem;
  font-size: 0.875rem;
  min-width: 200px;
  max-width: 320px;
  animation: slideIn 0.2s ease;
}

.toast.success { border-color: var(--success); color: var(--success); }
.toast.error { border-color: var(--danger); color: #fca5a5; }

@keyframes slideIn {
  from { transform: translateX(100%); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

/* ── Print styles ────────────────────────────────────────────────────────── */
@media print {
  .no-print { display: none !important; }
  .print-only { display: block !important; }

  body {
    background: white;
    color: black;
    font-size: 11pt;
  }

  .print-document {
    max-width: 100%;
    padding: 0;
  }

  .print-header {
    text-align: center;
    margin-bottom: 1cm;
    padding-bottom: 0.5cm;
    border-bottom: 2px solid black;
  }

  .print-header h1 { font-size: 16pt; }
  .print-header p { font-size: 10pt; color: #444; }

  table { border-collapse: collapse; width: 100%; }
  th, td { border: 1px solid #999; padding: 4pt 6pt; }
  th { background: #eee; }
}

.print-only { display: none; }

/* ── Upload area ─────────────────────────────────────────────────────────── */
.upload-area {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s;
}

.upload-area:hover, .upload-area.drag-over {
  border-color: var(--primary);
  background: rgba(79,142,247,0.05);
}

.upload-icon { font-size: 2.5rem; margin-bottom: 0.5rem; color: var(--text-muted); }
.upload-hint { color: var(--text-muted); font-size: 0.85rem; }

/* ── Loading spinner ─────────────────────────────────────────────────────── */
.spinner {
  display: inline-block;
  width: 18px;
  height: 18px;
  border: 2px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

.loading-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2000;
}

.loading-box {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

/* ── Responsive ──────────────────────────────────────────────────────────── */
@media (max-width: 768px) {
  .header { padding: 0.6rem 1rem; }
  .header-nav { display: none; }
  .cards-row { flex-direction: column; }
  .card { min-width: 0; }
  .filters input[type="text"] { width: 140px; }
  .snapshot-selectors { flex-direction: column; }
}