:root {
  --bg-dark: #0f172a;
  --bg-card: #1e293b;
  --bg-card-hover: #273549;
  --bg-sidebar: #0b1120;
  --border-color: #334155;
  --border-light: rgba(255, 255, 255, 0.08);

  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;

  --primary: #38bdf8;
  --primary-hover: #0ea5e9;
  --primary-glow: rgba(56, 189, 248, 0.25);

  --success: #10b981;
  --success-bg: rgba(16, 185, 129, 0.15);
  --warning: #f59e0b;
  --warning-bg: rgba(245, 158, 11, 0.15);
  --danger: #ef4444;
  --danger-bg: rgba(239, 68, 68, 0.15);
  --info: #6366f1;
  --info-bg: rgba(99, 102, 241, 0.15);
  --whatsapp: #25d366;
  --whatsapp-hover: #20ba5a;

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;

  --shadow-card: 0 10px 25px -5px rgba(0, 0, 0, 0.4), 0 8px 10px -6px rgba(0, 0, 0, 0.3);
  --font-heading: 'Outfit', sans-serif;
  --font-body: 'Plus Jakarta Sans', sans-serif;
}

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

body {
  font-family: var(--font-body);
  background-color: var(--bg-dark);
  color: var(--text-main);
  line-height: 1.5;
  min-height: 100vh;
  overflow-x: hidden;
}

/* Layout */
.app-container {
  display: flex;
  min-height: 100vh;
}

/* Sidebar */
.sidebar {
  width: 270px;
  background-color: var(--bg-sidebar);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  padding: 1.5rem 1rem;
  position: sticky;
  top: 0;
  height: 100vh;
  z-index: 50;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  padding: 0.5rem 0.5rem 1.75rem 0.5rem;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 1.5rem;
}

.brand-logo {
  width: 44px;
  height: 44px;
  background: linear-gradient(135deg, #38bdf8, #6366f1);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  color: #fff;
  box-shadow: 0 4px 15px var(--primary-glow);
}

.brand-info h2 {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 700;
  color: #fff;
  letter-spacing: -0.02em;
}

.badge-tag {
  font-size: 0.7rem;
  background: rgba(56, 189, 248, 0.15);
  color: var(--primary);
  padding: 2px 8px;
  border-radius: 20px;
  font-weight: 600;
  text-transform: uppercase;
}

.nav-menu {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  flex: 1;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  padding: 0.75rem 1rem;
  color: var(--text-muted);
  background: transparent;
  border: none;
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: 0.92rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
  position: relative;
  text-align: left;
  width: 100%;
}

.nav-item:hover {
  color: var(--text-main);
  background-color: rgba(255, 255, 255, 0.05);
}

.nav-item.active {
  color: #fff;
  background: linear-gradient(90deg, rgba(56, 189, 248, 0.15), rgba(99, 102, 241, 0.1));
  border-left: 3px solid var(--primary);
  font-weight: 600;
}

.nav-item i {
  font-size: 1.1rem;
  width: 20px;
}

.nav-badge {
  margin-left: auto;
  background: var(--danger);
  color: #fff;
  font-size: 0.72rem;
  padding: 2px 7px;
  border-radius: 10px;
  font-weight: 700;
}

.sidebar-footer {
  padding-top: 1rem;
  border-top: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.user-session-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 0.5rem 0.75rem;
}

.user-info-row {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.btn-logout-icon {
  background: transparent;
  border: none;
  color: var(--text-dim);
  cursor: pointer;
  font-size: 1rem;
  padding: 4px;
  border-radius: 4px;
  transition: color 0.2s ease;
}

.btn-logout-icon:hover {
  color: var(--danger);
}

/* Main Content */
.main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.top-header {
  height: 70px;
  padding: 0 2rem;
  border-bottom: 1px solid var(--border-color);
  background: rgba(15, 23, 42, 0.8);
  backdrop-filter: blur(12px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 40;
}

.header-search {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  background: var(--bg-card);
  padding: 0.5rem 1rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  width: 420px;
  transition: all 0.2s ease;
}

.header-search:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 2px var(--primary-glow);
}

.header-search input {
  background: transparent;
  border: none;
  color: var(--text-main);
  outline: none;
  width: 100%;
  font-family: var(--font-body);
  font-size: 0.9rem;
}

.header-search i {
  color: var(--text-dim);
}

.views-wrapper {
  padding: 2rem;
  flex: 1;
}

.tab-view {
  display: none;
  animation: fadeIn 0.25s ease forwards;
}

.tab-view.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

.view-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 1.75rem;
  gap: 1rem;
}

.view-header h1 {
  font-family: var(--font-heading);
  font-size: 1.65rem;
  font-weight: 700;
  color: #fff;
}

.view-header .subtitle {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-top: 0.2rem;
}

.current-period {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  padding: 0.45rem 1rem;
  border-radius: var(--radius-md);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* KPI Cards */
.kpi-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.25rem;
  margin-bottom: 1.75rem;
}

.kpi-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  display: flex;
  gap: 1.25rem;
  box-shadow: var(--shadow-card);
  position: relative;
  overflow: hidden;
}

.kpi-card::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
}

.card-gradient-1::after { background: linear-gradient(90deg, #38bdf8, #6366f1); }
.card-gradient-2::after { background: linear-gradient(90deg, #f59e0b, #ef4444); }
.card-gradient-3::after { background: linear-gradient(90deg, #10b981, #06b6d4); }
.card-gradient-4::after { background: linear-gradient(90deg, #8b5cf6, #ec4899); }

.kpi-icon {
  width: 50px;
  height: 50px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  flex-shrink: 0;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-light);
}

.card-gradient-1 .kpi-icon { color: var(--primary); }
.card-gradient-2 .kpi-icon { color: var(--warning); }
.card-gradient-3 .kpi-icon { color: var(--success); }
.card-gradient-4 .kpi-icon { color: #c084fc; }

.kpi-data {
  display: flex;
  flex-direction: column;
}

.kpi-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.kpi-value {
  font-family: var(--font-heading);
  font-size: 1.6rem;
  font-weight: 700;
  color: #fff;
  margin: 0.2rem 0;
}

.kpi-subtext {
  font-size: 0.78rem;
  color: var(--text-dim);
}

/* Dashboard Grid */
.dashboard-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

/* Content Cards */
.content-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  overflow: hidden;
}

.card-header {
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.card-header h3 {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 600;
  color: #fff;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.card-header h3 i {
  color: var(--primary);
}

.card-body {
  padding: 1.5rem;
}

/* Months Distribution Grid */
.months-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.85rem;
}

.month-box {
  background: rgba(15, 23, 42, 0.6);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.85rem;
  display: flex;
  flex-direction: column;
  transition: all 0.2s ease;
}

.month-box:hover {
  border-color: var(--primary);
  background: rgba(56, 189, 248, 0.05);
}

.month-name {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 600;
}

.month-amount {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 700;
  color: #fff;
  margin: 0.2rem 0;
}

.month-count {
  font-size: 0.72rem;
  color: var(--text-dim);
}

/* Service Breakdown Bar */
.service-stat-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.85rem 0;
  border-bottom: 1px solid var(--border-color);
}

.service-stat-item:last-child {
  border-bottom: none;
}

.service-info-flex {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.service-icon-box {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
}

/* Tables */
.table-responsive {
  overflow-x: auto;
}

.custom-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

.custom-table th {
  padding: 0.85rem 1rem;
  background: rgba(15, 23, 42, 0.7);
  color: var(--text-muted);
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  border-bottom: 1px solid var(--border-color);
}

.custom-table td {
  padding: 1rem;
  border-bottom: 1px solid var(--border-color);
  font-size: 0.88rem;
}

.custom-table tr:hover td {
  background-color: rgba(255, 255, 255, 0.02);
}

/* Status Badges */
.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
}

.status-paid { background: var(--success-bg); color: var(--success); }
.status-pending { background: var(--warning-bg); color: var(--warning); }
.status-overdue { background: var(--danger-bg); color: var(--danger); }
.status-requested { background: var(--info-bg); color: var(--info); }
.status-partial { background: rgba(234, 179, 8, 0.2); color: #eab308; }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.55rem 1.15rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  border: none;
  text-decoration: none;
}

.btn-sm {
  padding: 0.35rem 0.75rem;
  font-size: 0.78rem;
}

.btn-primary {
  background: var(--primary);
  color: #0f172a;
}

.btn-primary:hover {
  background: var(--primary-hover);
  box-shadow: 0 4px 15px var(--primary-glow);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-main);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.12);
}

.btn-whatsapp {
  background: var(--whatsapp);
  color: #fff;
}

.btn-whatsapp:hover {
  background: var(--whatsapp-hover);
  box-shadow: 0 4px 15px rgba(37, 211, 102, 0.3);
}

.btn-block {
  width: 100%;
}

.btn-icon {
  width: 32px;
  height: 32px;
  padding: 0;
  border-radius: var(--radius-sm);
}

/* Alert Banner */
.alert-banner {
  background: linear-gradient(90deg, rgba(239, 68, 68, 0.15), rgba(15, 23, 42, 0.9));
  border: 1px solid var(--danger);
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
  color: #fca5a5;
}

.alert-banner i {
  font-size: 1.5rem;
  color: var(--danger);
}

.hidden {
  display: none !important;
}

/* Clients Grid Cards */
.clients-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
  gap: 1.5rem;
}

.client-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-card);
  transition: all 0.25s ease;
  display: flex;
  flex-direction: column;
}

.client-card:hover {
  border-color: rgba(56, 189, 248, 0.4);
  transform: translateY(-2px);
}

.client-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 1rem;
  padding-bottom: 0.85rem;
  border-bottom: 1px solid var(--border-color);
}

.client-card-title h3 {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 700;
  color: #fff;
}

.client-tags {
  display: flex;
  gap: 0.35rem;
  margin-top: 0.25rem;
}

.client-tag {
  font-size: 0.7rem;
  padding: 2px 6px;
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-muted);
}

.client-contact-info {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.client-contact-info a {
  color: var(--primary);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.client-services-list {
  background: rgba(15, 23, 42, 0.6);
  border-radius: var(--radius-md);
  padding: 0.85rem;
  margin-bottom: 1rem;
  flex: 1;
}

.client-service-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.4rem 0;
  border-bottom: 1px solid var(--border-color);
  font-size: 0.8rem;
}

.client-service-row:last-child {
  border-bottom: none;
}

.client-card-footer {
  display: flex;
  gap: 0.5rem;
  margin-top: auto;
}

/* Modals */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(6px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: 1.5rem;
}

.modal-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  width: 100%;
  max-width: 580px;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.6);
  overflow: hidden;
  animation: modalPop 0.2s ease forwards;
}

.modal-lg {
  max-width: 700px;
}

@keyframes modalPop {
  from { opacity: 0; transform: scale(0.95); }
  to { opacity: 1; transform: scale(1); }
}

.modal-header {
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-header h3 {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: 700;
  color: #fff;
}

.modal-close {
  background: transparent;
  border: none;
  color: var(--text-dim);
  font-size: 1.5rem;
  cursor: pointer;
}

.modal-close:hover {
  color: #fff;
}

.modal-body {
  padding: 1.5rem;
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

/* Form Styles */
.form-group {
  margin-bottom: 1.15rem;
}

.form-group label {
  display: block;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 0.4rem;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.form-control, .form-select {
  width: 100%;
  background: rgba(15, 23, 42, 0.8);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 0.6rem 0.85rem;
  color: #fff;
  font-family: var(--font-body);
  font-size: 0.88rem;
  outline: none;
  transition: border-color 0.2s ease;
}

.form-control:focus, .form-select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 2px var(--primary-glow);
}

/* WhatsApp Preview Card */
.whatsapp-preview-card {
  background: #0b141a;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border-color);
  margin-bottom: 1.25rem;
}

.whatsapp-header {
  background: #202c33;
  padding: 0.85rem 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.whatsapp-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: #00a884;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
}

.whatsapp-bubble {
  padding: 1.25rem;
  background: #005c4b;
  margin: 1rem;
  border-radius: 8px 8px 0 8px;
  color: #e9edef;
  font-size: 0.88rem;
}

.whatsapp-bubble pre {
  font-family: var(--font-body);
  white-space: pre-wrap;
  word-break: break-word;
}

.whatsapp-actions {
  display: flex;
  justify-content: flex-end;
  gap: 0.75rem;
}

.color-whatsapp {
  color: var(--whatsapp);
}

.client-actions-bar {
  display: flex;
  gap: 0.75rem;
}

.view-filters {
  display: flex;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 2px;
}

.filter-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  padding: 0.4rem 0.85rem;
  font-size: 0.8rem;
  font-weight: 600;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.filter-btn.active {
  background: var(--primary);
  color: #0f172a;
}

/* Responsive */
@media (max-width: 992px) {
  .app-container {
    flex-direction: column;
  }
  .sidebar {
    width: 100%;
    height: auto;
    position: relative;
  }
  .dashboard-grid {
    grid-template-columns: 1fr;
  }
}