:root {
  --bg-start: #0f172a;
  --bg-mid: #1e3a5f;
  --bg-end: #312e81;
  --glass-bg: rgba(255, 255, 255, 0.12);
  --glass-bg-strong: rgba(255, 255, 255, 0.18);
  --glass-border: rgba(255, 255, 255, 0.22);
  --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.18);
  --card-bg: rgba(255, 255, 255, 0.78);
  --card-border: rgba(255, 255, 255, 0.5);
  --primary: #3b82f6;
  --primary-hover: #2563eb;
  --primary-glow: rgba(59, 130, 246, 0.35);
  --danger: #ef4444;
  --success: #22c55e;
  --text: #0f172a;
  --text-light: #f8fafc;
  --muted: #64748b;
  --border: rgba(148, 163, 184, 0.35);
  --settled-bg: rgba(241, 245, 249, 0.8);
  --settled-text: #94a3b8;
  --sidebar-width: 260px;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'PingFang SC',
    'Microsoft YaHei', sans-serif;
  color: var(--text);
  line-height: 1.5;
  min-height: 100vh;
  background: linear-gradient(135deg, var(--bg-start) 0%, var(--bg-mid) 45%, var(--bg-end) 100%);
  background-attachment: fixed;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  background:
    radial-gradient(circle at 20% 20%, rgba(59, 130, 246, 0.25), transparent 40%),
    radial-gradient(circle at 80% 80%, rgba(139, 92, 246, 0.2), transparent 40%);
  pointer-events: none;
  z-index: 0;
}

.hidden {
  display: none !important;
}

.glass {
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow);
}

/* Login */
.login-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  position: relative;
  z-index: 1;
}

.login-card {
  width: 100%;
  max-width: 420px;
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border-radius: 24px;
  padding: 44px 36px;
  border: 1px solid rgba(255, 255, 255, 0.6);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.25);
}

.login-card h1 {
  font-size: 1.6rem;
  margin-bottom: 8px;
  text-align: center;
  background: linear-gradient(135deg, #1e40af, #7c3aed);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.login-card .subtitle {
  text-align: center;
  color: var(--muted);
  margin-bottom: 28px;
  font-size: 0.9rem;
}

/* App Layout */
.app-layout {
  display: flex;
  min-height: 100vh;
  position: relative;
  z-index: 1;
}

.sidebar {
  width: var(--sidebar-width);
  min-height: 100vh;
  position: fixed;
  left: 0;
  top: 0;
  bottom: 0;
  display: flex;
  flex-direction: column;
  padding: 24px 16px;
  background: rgba(15, 23, 42, 0.55);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border-right: 1px solid rgba(255, 255, 255, 0.1);
  z-index: 100;
}

.sidebar-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px 12px 24px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  margin-bottom: 20px;
}

.brand-icon {
  width: 44px;
  height: 44px;
  border-radius: 14px;
  background: linear-gradient(135deg, #3b82f6, #8b5cf6);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  font-weight: 700;
  box-shadow: 0 4px 16px rgba(59, 130, 246, 0.4);
}

.sidebar-brand h1 {
  font-size: 1.05rem;
  color: var(--text-light);
  font-weight: 600;
  line-height: 1.3;
}

.sidebar-brand p {
  font-size: 0.75rem;
  color: rgba(248, 250, 252, 0.55);
}

.sidebar-nav {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 6px;
  overflow-y: auto;
}

.nav-label {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: rgba(248, 250, 252, 0.4);
  padding: 12px 14px 6px;
}

.tab {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
  padding: 12px 14px;
  border: none;
  border-radius: 12px;
  background: transparent;
  cursor: pointer;
  font-size: 0.9rem;
  color: rgba(248, 250, 252, 0.7);
  text-align: left;
  transition: all 0.2s ease;
}

.tab:hover {
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-light);
}

.tab.active {
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.35), rgba(139, 92, 246, 0.25));
  color: #fff;
  font-weight: 600;
  box-shadow: 0 4px 16px rgba(59, 130, 246, 0.2);
  border: 1px solid rgba(255, 255, 255, 0.15);
}

.tab-icon {
  width: 20px;
  text-align: center;
  font-size: 1rem;
  opacity: 0.9;
}

.sidebar-footer {
  padding-top: 16px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  margin-top: 12px;
}

.user-card {
  background: rgba(255, 255, 255, 0.08);
  border-radius: 14px;
  padding: 14px;
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.user-info {
  display: block;
  color: rgba(248, 250, 252, 0.85);
  font-size: 0.85rem;
  margin-bottom: 10px;
  word-break: break-all;
}

.sidebar-footer .btn {
  width: 100%;
}

.main-area {
  flex: 1;
  margin-left: var(--sidebar-width);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.main-header {
  padding: 28px 32px 0;
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  gap: 12px;
}

.menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.12);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  cursor: pointer;
  flex-shrink: 0;
  transition: background 0.2s;
}

.menu-toggle:hover {
  background: rgba(255, 255, 255, 0.2);
}

.menu-toggle-bar {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--text-light);
  border-radius: 2px;
  transition: transform 0.25s, opacity 0.25s;
}

.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 99;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.sidebar-overlay.visible {
  opacity: 1;
}

body.sidebar-open {
  overflow: hidden;
}

.main-header h2 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-light);
  text-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.container {
  flex: 1;
  max-width: 1200px;
  width: 100%;
  padding: 24px 32px 40px;
}

/* Cards */
.card {
  background: var(--card-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-radius: 20px;
  padding: 24px;
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.08);
  border: 1px solid var(--card-border);
  margin-bottom: 20px;
}

.card h2 {
  font-size: 1.1rem;
  margin-bottom: 16px;
  color: var(--text);
}

.summary-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}

.summary-item {
  background: var(--card-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-radius: 18px;
  padding: 22px;
  border: 1px solid var(--card-border);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
  transition: transform 0.2s, box-shadow 0.2s;
}

.summary-item:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.1);
}

.summary-item .label {
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 6px;
}

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

.summary-item.highlight .value {
  background: linear-gradient(135deg, #2563eb, #7c3aed);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.summary-item.success .value {
  color: var(--success);
}

/* Forms */
.form-group {
  margin-bottom: 16px;
}

.form-group label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  margin-bottom: 6px;
  color: var(--text);
}

.form-row {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  align-items: flex-end;
}

.form-row .form-group {
  flex: 1;
  min-width: 140px;
}

input {
  width: 100%;
  padding: 11px 14px;
  border: 1px solid var(--border);
  border-radius: 12px;
  font-size: 0.95rem;
  background: rgba(255, 255, 255, 0.9);
  transition: border-color 0.2s, box-shadow 0.2s;
}

select {
  width: 100%;
  min-width: 0;
  padding: 11px 36px 11px 14px;
  border: 1px solid var(--border);
  border-radius: 12px;
  font-size: 0.95rem;
  line-height: 1.4;
  color: var(--text);
  background-color: #fff;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%2364748b' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  background-size: 16px;
  -webkit-appearance: none;
  -moz-appearance: none;
  appearance: none;
  cursor: pointer;
  transition: border-color 0.2s, box-shadow 0.2s;
}

select::-ms-expand {
  display: none;
}

select option {
  color: var(--text);
  background: #fff;
}

input:focus,
select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 4px var(--primary-glow);
}

select:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 18px;
  border: none;
  border-radius: 12px;
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-primary {
  background: linear-gradient(135deg, #3b82f6, #6366f1);
  color: #fff;
  box-shadow: 0 4px 14px rgba(59, 130, 246, 0.35);
}

.btn-primary:hover:not(:disabled) {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(59, 130, 246, 0.45);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.65);
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-secondary:hover:not(:disabled) {
  background: rgba(255, 255, 255, 0.9);
}

.sidebar-footer .btn-secondary {
  background: rgba(255, 255, 255, 0.12);
  color: rgba(248, 250, 252, 0.9);
  border: 1px solid rgba(255, 255, 255, 0.15);
}

.sidebar-footer .btn-secondary:hover:not(:disabled) {
  background: rgba(255, 255, 255, 0.2);
}

.btn-danger {
  background: rgba(254, 226, 226, 0.9);
  color: var(--danger);
}

.btn-danger:hover:not(:disabled) {
  background: #fecaca;
}

.btn-sm {
  padding: 7px 13px;
  font-size: 0.8rem;
  border-radius: 10px;
}

.btn-settle {
  background: rgba(220, 252, 231, 0.95);
  color: var(--success);
}

.btn-settle:hover:not(:disabled) {
  background: #bbf7d0;
}

.stats-period.active {
  background: linear-gradient(135deg, #3b82f6, #6366f1);
  color: #fff;
  border-color: transparent;
}

.stats-period.active:hover:not(:disabled) {
  background: linear-gradient(135deg, #2563eb, #4f46e5);
  color: #fff;
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.35);
}

/* Table */
.table-wrap {
  overflow-x: auto;
  border-radius: 12px;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

th,
td {
  padding: 13px 16px;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

th {
  font-weight: 600;
  color: var(--muted);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  background: rgba(248, 250, 252, 0.5);
}

tr.settled {
  background: var(--settled-bg);
  color: var(--settled-text);
}

tr.settled td {
  text-decoration: line-through;
  text-decoration-color: #cbd5e1;
}

.badge {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 500;
}

.badge-settled {
  background: #e2e8f0;
  color: #64748b;
}

.badge-unsettled {
  background: #dbeafe;
  color: #1d4ed8;
}

.badge-admin {
  background: #fef3c7;
  color: #b45309;
}

.badge-user {
  background: #e0e7ff;
  color: #4338ca;
}

.action-btns {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  align-items: center;
}

td.actions,
th.actions {
  vertical-align: middle;
  white-space: nowrap;
}

.empty-state {
  text-align: center;
  padding: 40px;
  color: var(--muted);
}

.section-hint {
  color: var(--muted);
  font-size: 0.875rem;
  margin: -8px 0 16px;
}

.clickable-row {
  cursor: pointer;
  transition: background 0.15s;
}

.clickable-row:hover {
  background: rgba(59, 130, 246, 0.08);
}

.clickable-row.active {
  background: rgba(59, 130, 246, 0.15);
}

.detail-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.detail-summary {
  margin-bottom: 16px;
}

.summary-item .value.settlement-meta {
  font-size: 1.1rem;
}

.error-msg {
  background: rgba(254, 242, 242, 0.95);
  color: var(--danger);
  padding: 12px 16px;
  border-radius: 12px;
  font-size: 0.875rem;
  margin-bottom: 16px;
  border: 1px solid rgba(239, 68, 68, 0.2);
}

.success-msg {
  background: rgba(240, 253, 244, 0.95);
  color: var(--success);
  padding: 12px 16px;
  border-radius: 12px;
  font-size: 0.875rem;
  margin-bottom: 16px;
  border: 1px solid rgba(34, 197, 94, 0.2);
}

.period-tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}

@media (max-width: 900px) {
  .sidebar {
    width: 72px;
    padding: 16px 10px;
  }

  .sidebar-brand p,
  .sidebar-brand h1,
  .tab span:not(.tab-icon),
  .nav-label,
  .user-info {
    display: none;
  }

  .sidebar-brand {
    justify-content: center;
    padding-bottom: 16px;
  }

  .tab {
    justify-content: center;
    padding: 12px;
  }

  .main-area {
    margin-left: 72px;
  }

  .container {
    padding: 20px 16px 32px;
  }

  .main-header {
    padding: 20px 16px 0;
  }
}

@media (max-width: 768px) {
  .menu-toggle {
    display: flex;
  }

  .sidebar-overlay {
    display: block;
  }

  .sidebar {
    width: min(280px, 85vw);
    padding: 20px 16px;
    padding-left: max(16px, env(safe-area-inset-left));
    padding-bottom: max(20px, env(safe-area-inset-bottom));
    transform: translateX(-100%);
    transition: transform 0.3s ease;
    box-shadow: 4px 0 24px rgba(0, 0, 0, 0.3);
  }

  .sidebar.open {
    transform: translateX(0);
  }

  .sidebar-brand p,
  .sidebar-brand h1,
  .tab span:not(.tab-icon),
  .nav-label {
    display: revert;
  }

  .user-info {
    display: block;
  }

  .sidebar-brand {
    justify-content: flex-start;
    padding: 8px 12px 24px;
  }

  .tab {
    justify-content: flex-start;
    padding: 12px 14px;
  }

  .main-area {
    margin-left: 0;
  }

  .main-header {
    padding: 16px 16px 0;
    padding-top: max(16px, env(safe-area-inset-top));
    background: linear-gradient(180deg, rgba(15, 23, 42, 0.85) 0%, transparent 100%);
  }

  .main-header h2 {
    font-size: 1.25rem;
    flex: 1;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .container {
    padding: 16px 12px calc(32px + env(safe-area-inset-bottom));
  }

  .card {
    padding: 18px 16px;
    border-radius: 16px;
  }

  .summary-item {
    padding: 18px;
  }

  .summary-item .value {
    font-size: 1.35rem;
  }

  .form-row .form-group {
    min-width: 100%;
    flex: 1 1 100%;
  }

  .form-row .form-group[style*='flex:0'] {
    flex: 1 1 100%;
  }

  .form-row .form-group[style*='flex:0'] .btn {
    width: 100%;
  }

  .login-card {
    padding: 32px 24px;
    border-radius: 20px;
  }

  .login-card h1 {
    font-size: 1.4rem;
  }

  .detail-header {
    flex-wrap: wrap;
    gap: 12px;
  }

  .detail-header h2 {
    font-size: 1rem;
  }

  .period-tabs {
    gap: 6px;
  }

  .period-tabs .btn {
    flex: 1;
    min-width: calc(50% - 3px);
  }

  th,
  td {
    padding: 10px 12px;
    font-size: 0.85rem;
  }

  table {
    font-size: 0.85rem;
  }

  th {
    font-size: 0.7rem;
  }

  .table-wrap {
    margin: 0 -4px;
    -webkit-overflow-scrolling: touch;
  }

  .action-btns {
    flex-direction: column;
    align-items: stretch;
  }

  .action-btns .btn {
    width: 100%;
  }

  body.sidebar-open .menu-toggle-bar:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }

  body.sidebar-open .menu-toggle-bar:nth-child(2) {
    opacity: 0;
  }

  body.sidebar-open .menu-toggle-bar:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }
}

@media (max-width: 640px) {
  .form-row {
    flex-direction: column;
  }

  .summary-grid {
    grid-template-columns: 1fr;
    gap: 12px;
    margin-bottom: 16px;
  }

  .summary-grid.detail-summary {
    grid-template-columns: 1fr 1fr;
  }

  .summary-item .value.settlement-meta {
    font-size: 0.95rem;
    word-break: break-all;
  }
}

@media (max-width: 380px) {
  .summary-grid.detail-summary {
    grid-template-columns: 1fr;
  }

  .period-tabs .btn {
    min-width: 100%;
  }
}