:root {
  --bg-primary: #0b0f19;
  --bg-secondary: #111827;
  --bg-card: rgba(17, 24, 39, 0.85);
  --bg-card-hover: rgba(31, 41, 55, 0.9);
  --bg-input: #1f2937;
  --border-color: rgba(75, 85, 99, 0.4);
  --border-glow: rgba(99, 102, 241, 0.5);
  
  --text-main: #f3f4f6;
  --text-muted: #9ca3af;
  --text-dim: #6b7280;

  --primary: #6366f1;
  --primary-hover: #4f46e5;
  --primary-light: rgba(99, 102, 241, 0.15);
  
  --accent-cyan: #06b6d4;
  --accent-gold: #f59e0b;
  --accent-green: #10b981;
  --accent-rose: #f43f5e;
  --accent-purple: #a855f7;

  --vip-sss-grad: linear-gradient(135deg, #f59e0b, #ef4444);
  --vip-ss-grad: linear-gradient(135deg, #8b5cf6, #ec4899);
  --vip-s-grad: linear-gradient(135deg, #3b82f6, #06b6d4);
  --peak-grad: linear-gradient(135deg, #f43f5e, #fb923c);

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5), 0 0 15px rgba(99, 102, 241, 0.15);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 9999px;
}

[data-theme="light"] {
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-card: rgba(255, 255, 255, 0.95);
  --bg-card-hover: #f1f5f9;
  --bg-input: #f1f5f9;
  --border-color: #e2e8f0;
  --border-glow: rgba(99, 102, 241, 0.3);
  
  --text-main: #0f172a;
  --text-muted: #475569;
  --text-dim: #94a3b8;

  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-font-smoothing: antialiased;
}

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

/* Background Cyber Grid Accent */
.cyber-bg {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: 
    radial-gradient(circle at 15% 20%, rgba(99, 102, 241, 0.08) 0%, transparent 40%),
    radial-gradient(circle at 85% 75%, rgba(6, 182, 212, 0.08) 0%, transparent 40%);
  pointer-events: none;
  z-index: 0;
}

#app {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* Navigation Header */
header.app-header {
  position: sticky;
  top: 0;
  background: rgba(17, 24, 39, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  z-index: 50;
  padding: 0.75rem 1.5rem;
}

[data-theme="light"] header.app-header {
  background: rgba(255, 255, 255, 0.92);
}

.header-container {
  max-width: 1440px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand-section {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  cursor: pointer;
}

.brand-icon {
  width: 38px;
  height: 38px;
  background: linear-gradient(135deg, #6366f1, #06b6d4);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  box-shadow: 0 0 12px rgba(99, 102, 241, 0.4);
}

.brand-title {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  background: linear-gradient(90deg, #fff, #cbd5e1);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

[data-theme="light"] .brand-title {
  background: linear-gradient(90deg, #0f172a, #334155);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.brand-tag {
  font-size: 0.7rem;
  padding: 0.15rem 0.5rem;
  background: rgba(99, 102, 241, 0.2);
  border: 1px solid rgba(99, 102, 241, 0.4);
  color: #818cf8;
  border-radius: var(--radius-full);
  font-weight: 600;
}

/* Nav Tabs */
nav.main-nav {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  background: var(--bg-input);
  padding: 0.25rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
}

.nav-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  padding: 0.5rem 0.9rem;
  border-radius: var(--radius-md);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  transition: all 0.2s ease;
}

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

.nav-btn.active {
  background: var(--primary);
  color: #ffffff;
  box-shadow: 0 2px 8px rgba(99, 102, 241, 0.4);
}

.nav-btn .badge-count {
  font-size: 0.7rem;
  padding: 0.1rem 0.4rem;
  border-radius: var(--radius-full);
  background: rgba(0, 0, 0, 0.25);
}

/* Header Right Actions */
.header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

/* Role Selector Badge (Duo Mode) */
.duo-role-badge {
  display: flex;
  align-items: center;
  background: rgba(31, 41, 55, 0.8);
  border: 1px solid var(--border-color);
  padding: 0.25rem 0.5rem;
  border-radius: var(--radius-full);
  gap: 0.5rem;
  font-size: 0.8rem;
  cursor: pointer;
  transition: all 0.2s;
}

.duo-role-badge:hover {
  border-color: var(--primary);
}

.role-pill {
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-full);
  font-weight: 600;
}

.role-pill.wife {
  background: rgba(244, 63, 94, 0.2);
  color: #fb7185;
}

.role-pill.husband {
  background: rgba(6, 182, 212, 0.2);
  color: #38bdf8;
}

/* Quick Action Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.5rem 1rem;
  font-size: 0.85rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.2s;
  text-decoration: none;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
}
.btn-primary:hover {
  background: var(--primary-hover);
  box-shadow: 0 0 12px rgba(99, 102, 241, 0.4);
}

.btn-secondary {
  background: var(--bg-input);
  color: var(--text-main);
  border-color: var(--border-color);
}
.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
}

.btn-success {
  background: var(--accent-green);
  color: #fff;
}
.btn-success:hover {
  filter: brightness(1.1);
}

.btn-danger {
  background: var(--accent-rose);
  color: #fff;
}

.btn-sm {
  padding: 0.3rem 0.6rem;
  font-size: 0.75rem;
}

.btn-icon {
  width: 34px;
  height: 34px;
  padding: 0;
  border-radius: var(--radius-md);
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}
.btn-icon:hover {
  color: var(--text-main);
  border-color: var(--primary);
}

/* Main Content Area */
main.app-main {
  flex: 1;
  max-width: 1440px;
  width: 100%;
  margin: 0 auto;
  padding: 1.5rem;
}

/* General Layout Containers */
.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.page-title {
  font-size: 1.5rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.page-subtitle {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 0.2rem;
}

/* Grid System */
.grid-cols-4 {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1rem;
}

.grid-cols-3 {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.grid-cols-2 {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.25rem;
}

/* Card Component */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  box-shadow: var(--shadow-sm);
  transition: all 0.2s ease;
  backdrop-filter: blur(8px);
  position: relative;
}

.card:hover {
  border-color: rgba(99, 102, 241, 0.3);
  box-shadow: var(--shadow-md);
}

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

.card-title {
  font-size: 1rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* Metric Stats Card */
.stat-card {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  position: relative;
  overflow: hidden;
}

.stat-card::after {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 90px;
  height: 90px;
  background: radial-gradient(circle, var(--accent-glow, rgba(99,102,241,0.15)) 0%, transparent 70%);
  pointer-events: none;
}

.stat-label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.stat-value {
  font-size: 1.75rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text-main);
  display: flex;
  align-items: baseline;
  gap: 0.3rem;
}

.stat-unit {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-muted);
}

.stat-meta {
  font-size: 0.75rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

/* Peak Hour Banner & Glow */
.peak-hour-banner {
  background: linear-gradient(135deg, rgba(244, 63, 94, 0.15), rgba(249, 115, 22, 0.15));
  border: 1px solid rgba(244, 63, 94, 0.4);
  border-radius: var(--radius-lg);
  padding: 1rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
  position: relative;
  overflow: hidden;
}

.peak-badge {
  background: var(--peak-grad);
  color: white;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-full);
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  box-shadow: 0 0 10px rgba(244, 63, 94, 0.5);
  animation: pulse-glow 2s infinite;
}

@keyframes pulse-glow {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.85; transform: scale(1.02); }
}

/* Conflict Alert Card */
.conflict-box {
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.4);
  border-radius: var(--radius-md);
  padding: 1rem;
  margin-bottom: 1rem;
}

.conflict-title {
  color: #f87171;
  font-weight: 700;
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  margin-bottom: 0.5rem;
}

/* Badges & Tags */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.2rem 0.5rem;
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  white-space: nowrap;
}

.badge-vip-sss {
  background: var(--vip-sss-grad);
  color: #fff;
  box-shadow: 0 0 10px rgba(245, 158, 11, 0.4);
}

.badge-vip-ss {
  background: var(--vip-ss-grad);
  color: #fff;
}

.badge-vip-s {
  background: var(--vip-s-grad);
  color: #fff;
}

.badge-lead {
  background: rgba(147, 51, 234, 0.2);
  color: #c084fc;
  border: 1px solid rgba(147, 51, 234, 0.4);
}

.badge-converted {
  background: rgba(16, 185, 129, 0.2);
  color: #34d399;
  border: 1px solid rgba(16, 185, 129, 0.4);
}

.badge-overdue {
  background: rgba(239, 68, 68, 0.2);
  color: #f87171;
  border: 1px solid rgba(239, 68, 68, 0.4);
}

/* Hero Tag Pills */
.hero-tag {
  display: inline-flex;
  align-items: center;
  padding: 0.15rem 0.45rem;
  border-radius: var(--radius-sm);
  font-size: 0.72rem;
  font-weight: 600;
}

.hero-tag.good-at {
  background: rgba(16, 185, 129, 0.15);
  color: #34d399;
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.hero-tag.want-learn {
  background: rgba(168, 85, 247, 0.15);
  color: #c084fc;
  border: 1px solid rgba(168, 85, 247, 0.4);
  box-shadow: 0 0 8px rgba(168, 85, 247, 0.2);
}

.channel-tag {
  font-size: 0.72rem;
  padding: 0.15rem 0.45rem;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-muted);
}

/* Tables */
.table-container {
  overflow-x: auto;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
}

table.data-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.85rem;
}

table.data-table th {
  background: rgba(31, 41, 55, 0.6);
  padding: 0.75rem 1rem;
  color: var(--text-muted);
  font-weight: 600;
  border-bottom: 1px solid var(--border-color);
}

table.data-table td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-main);
  vertical-align: middle;
}

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

/* Modals */
.modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(5px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: 1rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
}

.modal-backdrop.active {
  opacity: 1;
  pointer-events: auto;
}

.modal-dialog {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  max-width: 620px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
  transform: translateY(20px);
  transition: transform 0.2s ease;
}

.modal-backdrop.active .modal-dialog {
  transform: translateY(0);
}

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

.modal-body {
  padding: 1.25rem;
}

.modal-footer {
  padding: 1rem 1.25rem;
  border-top: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 0.75rem;
}

/* Forms */
.form-group {
  margin-bottom: 1rem;
}

.form-label {
  display: block;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 0.35rem;
}

.form-input, .form-select, .form-textarea {
  width: 100%;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.55rem 0.85rem;
  color: var(--text-main);
  font-size: 0.875rem;
  font-family: inherit;
  transition: border-color 0.2s;
}

.form-input:focus, .form-select:focus, .form-textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 2px rgba(99, 102, 241, 0.2);
}

/* Filter Bar */
.filter-bar {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
  flex-wrap: wrap;
}

.search-box {
  flex: 1;
  min-width: 240px;
  position: relative;
}

.search-box input {
  padding-left: 2.2rem;
}

.search-icon {
  position: absolute;
  left: 0.75rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-dim);
  pointer-events: none;
}

/* Script Box with Copy Button */
.script-card {
  background: rgba(17, 24, 39, 0.7);
  border: 1px dashed rgba(99, 102, 241, 0.4);
  border-radius: var(--radius-md);
  padding: 0.85rem;
  position: relative;
  margin-top: 0.5rem;
}

.script-text {
  font-size: 0.825rem;
  line-height: 1.6;
  color: #e2e8f0;
}

/* Toast Notifications */
#toast-container {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.toast {
  background: rgba(17, 24, 39, 0.95);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.75rem 1rem;
  box-shadow: var(--shadow-lg);
  color: #fff;
  font-size: 0.85rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  min-width: 260px;
  animation: slide-in 0.25s ease forwards;
}

.toast.success { border-color: var(--accent-green); }
.toast.error { border-color: var(--accent-rose); }

@keyframes slide-in {
  from { opacity: 0; transform: translateY(15px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Responsive adjustments */
@media (max-width: 1024px) {
  .grid-cols-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid-cols-3 { grid-template-columns: repeat(1, minmax(0, 1fr)); }
  .grid-cols-2 { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  header.app-header { padding: 0.5rem 1rem; }
  .brand-title { display: none; }
  nav.main-nav { overflow-x: auto; max-width: calc(100vw - 120px); }
  .nav-btn span.label-text { display: none; }
  .grid-cols-4 { grid-template-columns: 1fr; }
  main.app-main { padding: 1rem; }
}