/* ═══════════════════════════════════════════════════════════
   CCD Billing & Payment System Styles
   Modern UI using CCD theme engine tokens
   CRITICAL: All colors use var(--ac*) tokens for theme support
═══════════════════════════════════════════════════════════ */

/* ── Layout ──────────────────────────────────────────────── */
.billing-layout {
  display: flex;
  min-height: 100vh;
  background: var(--bg, #0a0a0f);
}

.billing-sidebar {
  width: 280px;
  background: rgba(var(--ac-rgb), 0.03);
  border-right: 1px solid rgba(var(--ac-rgb), 0.12);
  display: flex;
  flex-direction: column;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
}

.billing-main {
  flex: 1;
  padding: 2rem;
  max-width: 1600px;
  margin: 0 auto;
  width: 100%;
}

/* ── Sidebar Header ──────────────────────────────────────── */
.billing-sidebar-header {
  padding: 1.5rem 1.25rem;
  border-bottom: 1px solid rgba(var(--ac-rgb), 0.12);
  display: flex;
  align-items: center;
  gap: 1rem;
}

.billing-icon-wrap {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: var(--ac-grad);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.billing-icon-wrap .material-icons-round {
  color: var(--ac-ink, #fff);
  font-size: 1.5rem;
}

.billing-sidebar-title {
  font-size: 1rem;
  font-weight: 800;
  color: #f1f5f9;
  margin: 0 0 0.2rem 0;
  letter-spacing: -0.01em;
}

.billing-sidebar-subtitle {
  font-size: 0.72rem;
  color: var(--text-muted, #94a3b8);
  margin: 0;
  font-family: 'JetBrains Mono', monospace;
}

/* ── Sidebar Navigation ──────────────────────────────────── */
.billing-nav {
  flex: 1;
  padding: 1rem 0;
  overflow-y: auto;
}

.billing-nav-section {
  margin-bottom: 1.5rem;
}

.billing-nav-label {
  font-size: 0.62rem;
  font-weight: 800;
  color: var(--text-muted, #94a3b8);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  font-family: 'JetBrains Mono', monospace;
  padding: 0 1.25rem 0.5rem;
}

.billing-nav-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.65rem 1.25rem;
  color: rgba(255, 255, 255, 0.7);
  text-decoration: none;
  transition: all 0.15s;
  font-size: 0.85rem;
  font-weight: 500;
  border-left: 3px solid transparent;
}

.billing-nav-item:hover {
  background: rgba(var(--ac-rgb), 0.08);
  color: var(--ac-200);
  border-left-color: rgba(var(--ac-rgb), 0.3);
}

.billing-nav-item.active {
  background: rgba(var(--ac-rgb), 0.12);
  color: var(--ac-200);
  border-left-color: var(--ac);
  font-weight: 600;
}

.billing-nav-item .material-icons-round {
  font-size: 1.1rem;
  color: inherit;
}

/* ── Sidebar Footer ──────────────────────────────────────── */
.billing-sidebar-footer {
  padding: 1rem 1.25rem;
  border-top: 1px solid rgba(var(--ac-rgb), 0.12);
}

.billing-back-link {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 0.75rem;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 8px;
  color: var(--text-muted, #94a3b8);
  text-decoration: none;
  font-size: 0.8rem;
  font-weight: 600;
  transition: all 0.15s;
}

.billing-back-link:hover {
  background: rgba(var(--ac-rgb), 0.08);
  border-color: rgba(var(--ac-rgb), 0.2);
  color: var(--ac-200);
}

.billing-back-link .material-icons-round {
  font-size: 1rem;
}

/* ── Page Header ─────────────────────────────────────────── */
.billing-page-header {
  margin-bottom: 2rem;
}

.billing-page-title {
  font-size: 1.8rem;
  font-weight: 800;
  color: #f1f5f9;
  margin: 0 0 0.5rem 0;
  letter-spacing: -0.02em;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.billing-page-title .material-icons-round {
  color: var(--ac-300);
  font-size: 2rem;
}

.billing-page-subtitle {
  font-size: 0.95rem;
  color: var(--text-muted, #94a3b8);
  margin: 0;
}

/* ── KPI Cards ───────────────────────────────────────────── */
.billing-kpi-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.25rem;
  margin-bottom: 2rem;
}

.billing-kpi-card {
  background: rgba(var(--ac-rgb), 0.05);
  border: 1px solid rgba(var(--ac-rgb), 0.15);
  border-radius: 14px;
  padding: 1.25rem;
  transition: all 0.2s;
}

.billing-kpi-card:hover {
  border-color: rgba(var(--ac-rgb), 0.3);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
}

.billing-kpi-card.success {
  background: rgba(16, 185, 129, 0.08);
  border-color: rgba(16, 185, 129, 0.2);
}

.billing-kpi-card.warning {
  background: rgba(234, 179, 8, 0.08);
  border-color: rgba(234, 179, 8, 0.2);
}

.billing-kpi-card.danger {
  background: rgba(244, 63, 94, 0.08);
  border-color: rgba(244, 63, 94, 0.2);
}

.billing-kpi-label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-muted, #94a3b8);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.75rem;
}

.billing-kpi-label .material-icons-round {
  font-size: 1rem;
  color: var(--ac-300);
}

.billing-kpi-card.success .billing-kpi-label .material-icons-round {
  color: #6ee7b7;
}

.billing-kpi-card.warning .billing-kpi-label .material-icons-round {
  color: #fcd34d;
}

.billing-kpi-card.danger .billing-kpi-label .material-icons-round {
  color: #fb7185;
}

.billing-kpi-value {
  font-size: 2rem;
  font-weight: 800;
  color: var(--ac-300);
  font-family: 'JetBrains Mono', monospace;
  line-height: 1;
  margin-bottom: 0.5rem;
}

.billing-kpi-card.success .billing-kpi-value {
  color: #6ee7b7;
}

.billing-kpi-card.warning .billing-kpi-value {
  color: #fcd34d;
}

.billing-kpi-card.danger .billing-kpi-value {
  color: #fb7185;
}

.billing-kpi-sub {
  font-size: 0.72rem;
  color: var(--text-muted, #94a3b8);
  font-family: 'JetBrains Mono', monospace;
}

/* ── Panel Component ─────────────────────────────────────── */
.billing-panel {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: 14px;
  overflow: hidden;
  margin-bottom: 1.5rem;
}

.billing-panel-header {
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.billing-panel-title {
  font-size: 1.1rem;
  font-weight: 800;
  color: #f1f5f9;
  margin: 0;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.billing-panel-title .material-icons-round {
  color: var(--ac-300);
  font-size: 1.3rem;
}

.billing-panel-body {
  padding: 1.5rem;
}

.billing-panel-footer {
  padding: 1rem 1.5rem;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  background: rgba(0, 0, 0, 0.2);
}

/* ── Buttons ─────────────────────────────────────────────── */
.btn-billing {
  padding: 0.65rem 1.25rem;
  border-radius: 8px;
  font-size: 0.85rem;
  font-weight: 700;
  font-family: 'Inter', sans-serif;
  cursor: pointer;
  transition: all 0.15s;
  border: none;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
}

.btn-billing .material-icons-round {
  font-size: 1.1rem;
}

.btn-billing-primary {
  background: var(--ac-grad);
  color: var(--ac-ink, #fff);
  box-shadow: 0 2px 8px rgba(var(--ac-rgb), 0.25);
}

.btn-billing-primary:hover {
  opacity: 0.9;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(var(--ac-rgb), 0.35);
}

.btn-billing-secondary {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(var(--ac-rgb), 0.2);
  color: var(--ac-200);
}

.btn-billing-secondary:hover {
  background: rgba(var(--ac-rgb), 0.12);
  border-color: rgba(var(--ac-rgb), 0.3);
}

.btn-billing-ghost {
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.12);
  color: rgba(255, 255, 255, 0.7);
}

.btn-billing-ghost:hover {
  background: rgba(255, 255, 255, 0.04);
  color: #fff;
}

.btn-billing-danger {
  background: rgba(244, 63, 94, 0.15);
  border: 1px solid rgba(244, 63, 94, 0.3);
  color: #fb7185;
}

.btn-billing-danger:hover {
  background: rgba(244, 63, 94, 0.25);
  border-color: rgba(244, 63, 94, 0.4);
}

.btn-billing-success {
  background: rgba(16, 185, 129, 0.15);
  border: 1px solid rgba(16, 185, 129, 0.3);
  color: #6ee7b7;
}

.btn-billing-success:hover {
  background: rgba(16, 185, 129, 0.25);
  border-color: rgba(16, 185, 129, 0.4);
}

/* ── Badges ──────────────────────────────────────────────── */
.billing-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.25rem 0.6rem;
  border-radius: 6px;
  font-size: 0.7rem;
  font-weight: 700;
  font-family: 'JetBrains Mono', monospace;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.billing-badge-draft {
  background: rgba(148, 163, 184, 0.15);
  color: #cbd5e1;
}

.billing-badge-sent {
  background: rgba(56, 189, 248, 0.15);
  color: #7dd3fc;
}

.billing-badge-viewed {
  background: rgba(var(--ac-rgb), 0.15);
  color: var(--ac-200);
}

.billing-badge-paid {
  background: rgba(16, 185, 129, 0.15);
  color: #6ee7b7;
}

.billing-badge-partial {
  background: rgba(234, 179, 8, 0.15);
  color: #fcd34d;
}

.billing-badge-overdue {
  background: rgba(244, 63, 94, 0.15);
  color: #fb7185;
}

.billing-badge-cancelled {
  background: rgba(100, 116, 139, 0.15);
  color: #94a3b8;
}

/* ── Toast Notifications ─────────────────────────────────── */
#billing-toast-container {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  max-width: 400px;
}

.billing-toast {
  background: rgba(20, 20, 32, 0.95);
  border: 1px solid rgba(var(--ac-rgb), 0.3);
  border-radius: 10px;
  padding: 1rem 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(8px);
  animation: slideInRight 0.3s ease-out;
}

@keyframes slideInRight {
  from {
    transform: translateX(400px);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

.billing-toast-icon {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.billing-toast-icon .material-icons-round {
  font-size: 1.2rem;
}

.billing-toast.success .billing-toast-icon {
  background: rgba(16, 185, 129, 0.2);
  color: #6ee7b7;
}

.billing-toast.error .billing-toast-icon {
  background: rgba(244, 63, 94, 0.2);
  color: #fb7185;
}

.billing-toast.warning .billing-toast-icon {
  background: rgba(234, 179, 8, 0.2);
  color: #fcd34d;
}

.billing-toast.info .billing-toast-icon {
  background: rgba(var(--ac-rgb), 0.2);
  color: var(--ac-200);
}

.billing-toast-content {
  flex: 1;
}

.billing-toast-title {
  font-size: 0.85rem;
  font-weight: 700;
  color: #f1f5f9;
  margin: 0 0 0.2rem 0;
}

.billing-toast-message {
  font-size: 0.75rem;
  color: var(--text-muted, #94a3b8);
  margin: 0;
  font-family: 'JetBrains Mono', monospace;
}

.billing-toast-close {
  background: none;
  border: none;
  color: var(--text-muted, #94a3b8);
  cursor: pointer;
  padding: 0.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 4px;
  transition: all 0.15s;
}

.billing-toast-close:hover {
  background: rgba(255, 255, 255, 0.08);
  color: #fff;
}

/* ── Table ───────────────────────────────────────────────── */
.billing-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
}

.billing-table thead {
  background: rgba(var(--ac-rgb), 0.05);
}

.billing-table th {
  padding: 0.85rem 1rem;
  text-align: left;
  font-size: 0.7rem;
  font-weight: 800;
  color: var(--text-muted, #94a3b8);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-family: 'JetBrains Mono', monospace;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.billing-table tbody tr {
  transition: all 0.15s;
}

.billing-table tbody tr:hover {
  background: rgba(var(--ac-rgb), 0.04);
}

.billing-table td {
  padding: 1rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.85);
}

.billing-table tbody tr:last-child td {
  border-bottom: none;
}

/* ── Responsive ──────────────────────────────────────────── */
@media (max-width: 1024px) {
  .billing-sidebar {
    width: 240px;
  }
  
  .billing-main {
    padding: 1.5rem;
  }
}

@media (max-width: 768px) {
  .billing-layout {
    flex-direction: column;
  }
  
  .billing-sidebar {
    width: 100%;
    height: auto;
    position: relative;
  }
  
  .billing-main {
    padding: 1rem;
  }
  
  .billing-kpi-grid {
    grid-template-columns: 1fr;
  }
  
  #billing-toast-container {
    right: 1rem;
    left: 1rem;
    bottom: 1rem;
    max-width: none;
  }
}