:root {
  --bg: #0f0f1a;
  --bg-2: #1a1a2e;
  --bg-3: #16213e;
  --bg-card: #1e1e35;
  --border: #2a2a4a;
  --text: #e8e8f0;
  --text-dim: #8888aa;
  --accent: #6c63ff;
  --accent-2: #ff6584;
  --green: #4ade80;
  --red: #f87171;
  --yellow: #fbbf24;
  --blue: #60a5fa;
  --radius: 12px;
  --shadow: 0 4px 20px rgba(0,0,0,.4);
}

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

body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, 'Helvetica Neue', 'PingFang TC', 'Microsoft JhengHei', sans-serif;
  font-size: 15px;
  min-height: 100vh;
  overflow-x: hidden;
}

/* ── Layout ── */
#app { display: flex; flex-direction: column; min-height: 100vh; }

/* ── Auth ── */
.auth-wrap {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #0f0f1a 0%, #1a1a2e 50%, #16213e 100%);
  padding: 20px;
}
.auth-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 40px 36px;
  width: 100%;
  max-width: 420px;
  box-shadow: var(--shadow);
}
.auth-logo {
  text-align: center;
  margin-bottom: 28px;
}
.auth-logo .logo-icon {
  font-size: 48px;
  display: block;
  margin-bottom: 8px;
}
.auth-logo h1 {
  font-size: 26px;
  font-weight: 800;
  background: linear-gradient(135deg, #6c63ff, #ff6584);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.auth-logo p { color: var(--text-dim); font-size: 13px; margin-top: 4px; }

/* ── Form ── */
.form-group { margin-bottom: 16px; }
.form-label {
  display: block;
  font-size: 13px;
  color: var(--text-dim);
  margin-bottom: 6px;
  font-weight: 500;
}
.form-input {
  width: 100%;
  background: var(--bg-3);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 14px;
  color: var(--text);
  font-size: 15px;
  outline: none;
  transition: border-color .2s;
}
.form-input:focus { border-color: var(--accent); }
.form-input::placeholder { color: var(--text-dim); }
select.form-input option { background: var(--bg-3); }

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 11px 20px;
  border-radius: 10px;
  border: none;
  cursor: pointer;
  font-size: 14px;
  font-weight: 600;
  transition: all .2s;
  text-decoration: none;
  white-space: nowrap;
}
.btn:active { transform: scale(.97); }
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: #5a52e0; }
.btn-success { background: #16a34a; color: #fff; }
.btn-success:hover { background: #15803d; }
.btn-danger  { background: #dc2626; color: #fff; }
.btn-danger:hover  { background: #b91c1c; }
.btn-secondary {
  background: var(--bg-3);
  color: var(--text);
  border: 1px solid var(--border);
}
.btn-secondary:hover { border-color: var(--accent); color: var(--accent); }
.btn-full { width: 100%; }
.btn-sm { padding: 6px 12px; font-size: 12px; border-radius: 8px; }
.btn-xs { padding: 4px 8px; font-size: 11px; border-radius: 6px; }

/* ── Top Nav ── */
.top-nav {
  background: var(--bg-2);
  border-bottom: 1px solid var(--border);
  padding: 0 16px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 100;
}
.nav-brand {
  font-size: 18px;
  font-weight: 800;
  background: linear-gradient(135deg, #6c63ff, #ff6584);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.nav-user { display: flex; align-items: center; gap: 10px; }
.nav-user-name { font-size: 13px; color: var(--text-dim); }

/* ── Bottom Tab Nav ── */
.bottom-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--bg-2);
  border-top: 1px solid var(--border);
  display: flex;
  z-index: 100;
  padding-bottom: env(safe-area-inset-bottom);
}
.tab-item {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 8px 4px 6px;
  cursor: pointer;
  border: none;
  background: none;
  color: var(--text-dim);
  font-size: 10px;
  gap: 3px;
  transition: color .2s;
  -webkit-tap-highlight-color: transparent;
}
.tab-item i { font-size: 18px; }
.tab-item.active { color: var(--accent); }
.tab-item:active { opacity: .7; }

/* ── Main Content ── */
.main-content {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
  padding-bottom: 80px;
}

/* ── Cards ── */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 12px;
}
.card-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-dim);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.stat-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
  margin-bottom: 12px;
}
.stat-card {
  background: var(--bg-3);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px 12px;
  text-align: center;
}
.stat-label { font-size: 11px; color: var(--text-dim); margin-bottom: 6px; }
.stat-value { font-size: 20px; font-weight: 800; }
.stat-sub   { font-size: 11px; color: var(--text-dim); margin-top: 2px; }
.text-green  { color: var(--green); }
.text-red    { color: var(--red); }
.text-yellow { color: var(--yellow); }
.text-blue   { color: var(--blue); }
.text-accent { color: var(--accent); }

/* ── Table ── */
.table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; }
table { width: 100%; border-collapse: collapse; font-size: 13px; }
th {
  background: var(--bg-3);
  color: var(--text-dim);
  padding: 8px 10px;
  text-align: left;
  font-weight: 600;
  white-space: nowrap;
  border-bottom: 1px solid var(--border);
}
td {
  padding: 10px;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
}
tr:last-child td { border-bottom: none; }
tr:hover td { background: rgba(108,99,255,.05); }

/* ── Status Badge ── */
.badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 20px;
  font-size: 11px;
  font-weight: 600;
}
.badge-warn   { background: rgba(251,191,36,.15); color: var(--yellow); border: 1px solid rgba(251,191,36,.3); }
.badge-ok     { background: rgba(74,222,128,.15); color: var(--green);  border: 1px solid rgba(74,222,128,.3); }
.badge-draft  { background: rgba(96,165,250,.15); color: var(--blue);   border: 1px solid rgba(96,165,250,.3); }

/* ── Section Header ── */
.section-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
  flex-wrap: wrap;
  gap: 8px;
}
.section-title {
  font-size: 16px;
  font-weight: 700;
}
.filter-bar {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 12px;
}
.filter-bar select,
.filter-bar input {
  background: var(--bg-3);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 10px;
  color: var(--text);
  font-size: 13px;
  outline: none;
}

/* ── Modal ── */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.7);
  z-index: 200;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding: 0;
  animation: fadeIn .2s;
}
.modal-box {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 20px 20px 0 0;
  width: 100%;
  max-width: 600px;
  max-height: 92vh;
  overflow-y: auto;
  padding: 20px;
  animation: slideUp .25s ease;
}
.modal-title {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.modal-close {
  background: none;
  border: none;
  color: var(--text-dim);
  font-size: 20px;
  cursor: pointer;
  padding: 4px;
}
@keyframes fadeIn  { from { opacity: 0 } to { opacity: 1 } }
@keyframes slideUp { from { transform: translateY(30px) } to { transform: translateY(0) } }

/* ── Toast ── */
#toast-container {
  position: fixed;
  top: 70px;
  right: 16px;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.toast {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 16px;
  font-size: 13px;
  box-shadow: var(--shadow);
  animation: slideIn .2s ease;
  max-width: 300px;
}
.toast.success { border-left: 3px solid var(--green); }
.toast.error   { border-left: 3px solid var(--red); }
.toast.info    { border-left: 3px solid var(--blue); }
@keyframes slideIn { from { opacity:0; transform: translateX(20px) } to { opacity:1; transform: translateX(0) } }

/* ── Misc ── */
.empty-state {
  text-align: center;
  padding: 40px 20px;
  color: var(--text-dim);
}
.empty-state i { font-size: 40px; margin-bottom: 12px; display: block; }
.divider { border: none; border-top: 1px solid var(--border); margin: 12px 0; }
.flex   { display: flex; }
.gap-2  { gap: 8px; }
.gap-3  { gap: 12px; }
.flex-1 { flex: 1; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.text-right { text-align: right; }
.text-center { text-align: center; }
.fw-700 { font-weight: 700; }
.fs-12  { font-size: 12px; }
.fs-13  { font-size: 13px; }
.mb-8  { margin-bottom: 8px; }
.mb-12 { margin-bottom: 12px; }
.mt-8  { margin-top: 8px; }
.color-dim { color: var(--text-dim); }

/* ── 價格模式切換 ── */
.mode-btns { display: flex; gap: 6px; margin-bottom: 8px; }
.mode-btn {
  flex: 1;
  padding: 8px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg-3);
  color: var(--text-dim);
  cursor: pointer;
  font-size: 13px;
  font-weight: 600;
  text-align: center;
  transition: all .2s;
}
.mode-btn.active { background: var(--accent); color: #fff; border-color: var(--accent); }

/* ── 結算單 ── */
.statement-card {
  background: #fff;
  color: #1a1a1a;
  border: 1px solid #ddd;
  border-radius: 8px;
  font-family: -apple-system, 'PingFang TC', 'Microsoft JhengHei', sans-serif;
}

/* ── PWA Install Banner ── */
#pwa-banner {
  position: fixed;
  bottom: 70px;
  left: 12px;
  right: 12px;
  background: var(--bg-card);
  border: 1px solid var(--accent);
  border-radius: 14px;
  padding: 14px 16px;
  display: flex;
  align-items: center;
  gap: 12px;
  z-index: 150;
  box-shadow: var(--shadow);
}

/* ── Responsive ── */
@media (min-width: 640px) {
  .stat-grid { grid-template-columns: repeat(4, 1fr); }
  .modal-backdrop { align-items: center; padding: 20px; }
  .modal-box { border-radius: 20px; }
}