/* ==========================================================================
   FlatExpense 3-Way Split Manager - Design System & Modern CSS Variables
   ========================================================================== */

:root {
  /* Color Palette - Modern Dark Theme Defaults */
  --bg-primary: #0b0f19;
  --bg-secondary: #111827;
  --bg-card: rgba(17, 24, 39, 0.75);
  --bg-card-hover: rgba(31, 41, 55, 0.85);
  --border-color: rgba(255, 255, 255, 0.08);
  --border-glow: rgba(99, 102, 241, 0.25);
  
  --text-primary: #f9fafb;
  --text-secondary: #9ca3af;
  --text-muted: #6b7280;

  /* Accent & Category Colors */
  --accent-primary: #6366f1; /* Indigo */
  --accent-primary-hover: #4f46e5;
  --accent-secondary: #06b6d4; /* Cyan */
  --accent-success: #10b981; /* Emerald */
  --accent-warning: #f59e0b; /* Amber */
  --accent-danger: #ef4444; /* Red */
  --accent-whatsapp: #25d366; /* WhatsApp Green */

  /* Badges & Highlights */
  --badge-rented-bg: rgba(6, 182, 212, 0.15);
  --badge-rented-text: #22d3ee;
  --badge-onetime-bg: rgba(245, 158, 11, 0.15);
  --badge-onetime-text: #fbbf24;
  --badge-personal-bg: rgba(239, 68, 68, 0.15);
  --badge-personal-text: #f87171;

  /* Fonts & Shadows */
  --font-family: 'Plus Jakarta Sans', system-ui, -apple-system, sans-serif;
  --font-heading: 'Outfit', system-ui, sans-serif;
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 10px 25px -5px rgba(0, 0, 0, 0.4), 0 8px 10px -6px rgba(0, 0, 0, 0.3);
  --shadow-glow: 0 0 25px rgba(99, 102, 241, 0.25);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Light Theme Overrides */
body.light-theme {
  --bg-primary: #f3f4f6;
  --bg-secondary: #ffffff;
  --bg-card: rgba(255, 255, 255, 0.85);
  --bg-card-hover: rgba(249, 250, 251, 1);
  --border-color: rgba(0, 0, 0, 0.08);
  --border-glow: rgba(99, 102, 241, 0.15);

  --text-primary: #111827;
  --text-secondary: #4b5563;
  --text-muted: #9ca3af;
  
  --shadow-md: 0 10px 25px -5px rgba(0, 0, 0, 0.08);
}

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

body {
  font-family: var(--font-family);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.5;
  background-image: 
    radial-gradient(at 10% 10%, rgba(99, 102, 241, 0.15) 0px, transparent 50%),
    radial-gradient(at 90% 90%, rgba(6, 182, 212, 0.12) 0px, transparent 50%);
  background-attachment: fixed;
}

/* Header */
.app-header {
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(16px);
}

.header-container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

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

.logo-icon {
  font-size: 2rem;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  padding: 0.4rem;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-glow);
}

.brand-text h1 {
  font-family: var(--font-heading);
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.brand-text h1 span {
  color: var(--accent-primary);
  font-size: 0.85rem;
  background: rgba(99, 102, 241, 0.15);
  padding: 0.2rem 0.6rem;
  border-radius: 20px;
  vertical-align: middle;
}

.tagline {
  font-size: 0.78rem;
  color: var(--text-secondary);
}

.header-controls {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.month-selector-wrapper {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.clerk-user-btn {
  position: relative;
  display: flex;
  align-items: center;
}

.user-pill-btn {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  padding: 0.3rem 0.35rem 0.3rem 0.85rem;
  border-radius: 30px;
  cursor: pointer;
  transition: var(--transition);
}

.user-pill-btn:hover {
  border-color: var(--accent-primary);
  background: rgba(255, 255, 255, 0.08);
}

.user-pill-name {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-primary);
  max-width: 140px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.user-avatar-circle {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent-secondary), var(--accent-primary));
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.9rem;
}

.user-dropdown-menu {
  position: absolute;
  top: 125%;
  right: 0;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.85rem;
  width: 220px;
  box-shadow: var(--shadow-md);
  z-index: 500;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.dropdown-header strong {
  display: block;
  font-size: 0.9rem;
}

.dropdown-item {
  background: transparent;
  border: none;
  color: var(--accent-danger);
  padding: 0.5rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-family);
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  text-align: left;
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.dropdown-item:hover {
  background: rgba(239, 68, 68, 0.12);
}

/* ==========================================================================
   LANDING PAGE SECTION (SIGMAGPT / CLERK STYLE)
   ========================================================================== */

.landing-section {
  max-width: 1280px;
  margin: 2rem auto;
  padding: 0 1.5rem 4rem 1.5rem;
}

.landing-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 3rem;
  align-items: center;
}

@media (min-width: 992px) {
  .landing-grid {
    grid-template-columns: 1.2fr 1fr;
  }
}

.landing-hero {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(99, 102, 241, 0.15);
  color: var(--accent-primary);
  border: 1px solid rgba(99, 102, 241, 0.3);
  padding: 0.35rem 0.9rem;
  border-radius: 30px;
  font-size: 0.82rem;
  font-weight: 700;
  width: fit-content;
}

.hero-title {
  font-family: var(--font-heading);
  font-size: 2.5rem;
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, #ffffff 40%, var(--text-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

@media (max-width: 640px) {
  .hero-title { font-size: 1.9rem; }
}

.hero-description {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.hero-features-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-top: 0.5rem;
}

.hero-feature-item {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  padding: 1rem 1.25rem;
  border-radius: var(--radius-md);
  backdrop-filter: blur(12px);
  transition: var(--transition);
}

.hero-feature-item:hover {
  border-color: var(--accent-primary);
  transform: translateX(4px);
}

.feature-icon {
  font-size: 1.5rem;
  background: rgba(255, 255, 255, 0.05);
  padding: 0.4rem;
  border-radius: var(--radius-sm);
}

.hero-feature-item strong {
  display: block;
  font-size: 0.95rem;
  color: var(--text-primary);
}

.hero-feature-item p {
  font-size: 0.83rem;
  color: var(--text-secondary);
  margin-top: 0.15rem;
}

/* Auth Card Container */
.landing-auth-wrapper {
  display: flex;
  justify-content: center;
}

.auth-card-box {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2rem;
  width: 100%;
  max-width: 440px;
  box-shadow: var(--shadow-md), 0 0 30px rgba(99, 102, 241, 0.15);
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.auth-card-header h2 {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 0.35rem;
}

.auth-card-header p {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.clerk-signin-box {
  width: 100%;
  display: flex;
  justify-content: center;
  min-height: 200px;
}

.clerk-signin-box .cl-rootBox,
.clerk-signin-box .cl-card {
  width: 100% !important;
  max-width: 100% !important;
  box-shadow: none !important;
  background: transparent !important;
}

/* Custom Fallback Auth Card Buttons */
.custom-auth-card {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  width: 100%;
}

.auth-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  width: 100%;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-family);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid var(--border-color);
  background: var(--bg-primary);
  color: var(--text-primary);
  transition: var(--transition);
}

.auth-btn:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--accent-primary);
  transform: translateY(-2px);
}

.btn-google {
  background: rgba(255, 255, 255, 0.05);
}

.btn-github {
  background: #181717;
  color: white;
}

.auth-divider {
  display: flex;
  align-items: center;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.75rem;
  margin: 0.25rem 0;
}

.auth-divider::before, .auth-divider::after {
  content: '';
  flex: 1;
  border-bottom: 1px solid var(--border-color);
}

.auth-divider span {
  padding: 0 0.5rem;
}

.auth-footer-badge {
  text-align: center;
  font-size: 0.78rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border-color);
  padding-top: 1rem;
}

.auth-footer-badge strong {
  color: var(--accent-primary);
}

.clerk-key-notice {
  background: rgba(245, 158, 11, 0.08);
  border: 1px solid rgba(245, 158, 11, 0.3);
  padding: 1.25rem;
  border-radius: var(--radius-md);
  font-size: 0.85rem;
}

.notice-badge {
  color: var(--accent-warning);
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.key-input-row {
  display: flex;
  gap: 0.5rem;
  margin: 0.75rem 0;
}

.small-text {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 0.75rem;
  margin-bottom: 0.35rem;
}

/* Main App Layout */
.main-layout {
  max-width: 1280px;
  margin: 1.5rem auto;
  padding: 0 1.5rem 3rem 1.5rem;
}

/* Metrics Top Grid */
.metrics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.25rem;
  margin-bottom: 1.5rem;
}

.metric-card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.metric-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: var(--accent-primary);
}

.metric-card.card-rent::before { background: var(--accent-secondary); }
.metric-card.card-onetime::before { background: var(--accent-warning); }
.metric-card.card-personal::before { background: var(--accent-danger); }

.metric-card:hover {
  transform: translateY(-3px);
  border-color: var(--border-glow);
  box-shadow: var(--shadow-md);
}

.metric-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.5rem;
}

.metric-title {
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-weight: 600;
}

.metric-value {
  font-family: var(--font-heading);
  font-size: 1.85rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
  color: var(--text-primary);
}

.metric-sub {
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* Tabs Navigation */
.tabs-nav {
  display: flex;
  gap: 0.5rem;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 1.5rem;
  overflow-x: auto;
  padding-bottom: 0.25rem;
}

.tab-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  padding: 0.75rem 1.25rem;
  font-weight: 600;
  font-size: 0.9rem;
  font-family: var(--font-family);
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
}

.tab-btn:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.03);
}

.tab-btn.active {
  color: var(--accent-primary);
  border-bottom: 3px solid var(--accent-primary);
  background: rgba(99, 102, 241, 0.08);
}

.tab-btn.highlight-tab.active {
  color: var(--accent-success);
  border-bottom-color: var(--accent-success);
  background: rgba(16, 185, 129, 0.08);
}

/* Tab Content */
.tab-content {
  display: none;
  animation: fadeIn 0.3s ease-in-out;
}

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

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

/* Card & Panels */
.card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  box-shadow: var(--shadow-sm);
}

.card-header {
  margin-bottom: 1.25rem;
}

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

.action-buttons-gap {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.card-header h2, .card-header h3 {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
}

.subtitle {
  font-size: 0.83rem;
  color: var(--text-secondary);
  margin-top: 0.2rem;
}

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

@media (min-width: 992px) {
  .dashboard-grid {
    grid-template-columns: 2fr 1fr;
  }
  .card-wide {
    grid-column: span 2;
  }
}

/* Roommates Summary Cards */
.roommates-summary-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.25rem;
}

.roommate-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  transition: var(--transition);
}

.roommate-card:hover {
  border-color: var(--accent-primary);
  box-shadow: var(--shadow-md);
}

.roommate-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 0.75rem;
}

.roommate-name {
  font-weight: 700;
  font-size: 1.05rem;
}

.net-status {
  font-size: 0.8rem;
  font-weight: 700;
  padding: 0.25rem 0.6rem;
  border-radius: 20px;
}

.status-gets {
  background: rgba(16, 185, 129, 0.15);
  color: var(--accent-success);
}

.status-owes {
  background: rgba(239, 68, 68, 0.15);
  color: var(--accent-danger);
}

.status-settled {
  background: rgba(156, 163, 175, 0.15);
  color: var(--text-muted);
}

.roommate-details-list {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  font-size: 0.85rem;
}

.detail-row {
  display: flex;
  justify-content: space-between;
  color: var(--text-secondary);
}

.detail-row.bold {
  font-weight: 700;
  color: var(--text-primary);
  margin-top: 0.3rem;
  padding-top: 0.4rem;
  border-top: 1px dashed var(--border-color);
}

/* Preset Buttons Grid */
.preset-buttons-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 0.75rem;
}

.preset-btn {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  text-align: left;
  transition: var(--transition);
}

.preset-btn:hover {
  background: var(--accent-primary);
  border-color: var(--accent-primary);
  color: white;
  transform: translateY(-2px);
}

/* Data Tables */
.table-responsive {
  width: 100%;
  overflow-x: auto;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.9rem;
}

.data-table th {
  background: rgba(255, 255, 255, 0.03);
  color: var(--text-secondary);
  font-weight: 600;
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--border-color);
  white-space: nowrap;
}

.data-table td {
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-primary);
}

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

/* Category & Badge Styles */
.badge {
  display: inline-block;
  padding: 0.2rem 0.6rem;
  border-radius: 12px;
  font-size: 0.75rem;
  font-weight: 600;
}

.badge-rented {
  background: var(--badge-rented-bg);
  color: var(--badge-rented-text);
}

.badge-onetime {
  background: var(--badge-onetime-bg);
  color: var(--badge-onetime-text);
}

.badge-personal {
  background: var(--badge-personal-bg);
  color: var(--badge-personal-text);
}

.badge-utility {
  background: rgba(99, 102, 241, 0.15);
  color: #a5b4fc;
}

.badge-info {
  background: rgba(99, 102, 241, 0.15);
  color: var(--accent-primary);
}

/* Settlements Layout */
.settlement-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

@media (min-width: 992px) {
  .settlement-layout {
    grid-template-columns: 3fr 2fr;
  }
}

.highlight-card {
  border-color: rgba(16, 185, 129, 0.3);
  box-shadow: 0 0 25px rgba(16, 185, 129, 0.08);
}

.balances-matrix {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.balance-box {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1rem;
  text-align: center;
}

.balance-box .name {
  font-weight: 700;
  font-size: 1rem;
  margin-bottom: 0.2rem;
}

.balance-box .amt {
  font-family: var(--font-heading);
  font-size: 1.4rem;
  font-weight: 700;
}

.transfers-container {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  margin-top: 1rem;
}

.transfer-card {
  background: var(--bg-secondary);
  border: 1px solid rgba(16, 185, 129, 0.3);
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.transfer-details {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1rem;
}

.transfer-arrow {
  color: var(--accent-success);
  font-weight: bold;
}

.transfer-amount {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--accent-success);
}

/* WhatsApp Preview Box */
.whatsapp-preview-box {
  background: #0b141a;
  color: #e9edef;
  font-family: monospace, sans-serif;
  font-size: 0.85rem;
  padding: 1.25rem;
  border-radius: var(--radius-md);
  border: 1px solid rgba(37, 211, 102, 0.2);
  white-space: pre-wrap;
  line-height: 1.6;
  max-height: 480px;
  overflow-y: auto;
}

/* Form Controls & Modal */
.input-control {
  width: 100%;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 0.65rem 0.9rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-family);
  font-size: 0.9rem;
  outline: none;
  transition: var(--transition);
}

.input-control:focus {
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

.filters-bar {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.filters-bar input, .filters-bar select {
  width: auto;
  min-width: 160px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.65rem 1.2rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-family);
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: var(--transition);
  white-space: nowrap;
}

.btn-primary {
  background: var(--accent-primary);
  color: white;
}

.btn-primary:hover {
  background: var(--accent-primary-hover);
  box-shadow: var(--shadow-glow);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-primary);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.15);
}

.btn-outline {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
}

.btn-outline:hover {
  border-color: var(--accent-primary);
  color: var(--accent-primary);
}

.btn-whatsapp {
  background: var(--accent-whatsapp);
  color: #052e16;
  font-weight: 700;
}

.btn-whatsapp:hover {
  background: #22c55e;
  box-shadow: 0 0 15px rgba(37, 211, 102, 0.3);
}

.btn-danger {
  background: var(--accent-danger);
  color: white;
}

.btn-danger:hover {
  background: #dc2626;
}

.btn-sm {
  padding: 0.4rem 0.75rem;
  font-size: 0.8rem;
}

.btn-icon-only {
  padding: 0.65rem;
  border-radius: 50%;
}

.w-100 { width: 100%; }

/* Modal System */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(8px);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
  padding: 1rem;
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 540px;
  padding: 1.5rem;
  box-shadow: var(--shadow-md);
  max-height: 90vh;
  overflow-y: auto;
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.25rem;
}

.modal-header h3 {
  font-family: var(--font-heading);
  font-size: 1.2rem;
}

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

.form-group {
  margin-bottom: 1.1rem;
}

.form-group label {
  display: block;
  font-size: 0.83rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 0.35rem;
}

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

.split-options {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.radio-card {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-color);
  padding: 0.75rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition);
}

.radio-card:hover {
  background: rgba(255, 255, 255, 0.06);
  border-color: var(--accent-primary);
}

.radio-content strong {
  display: block;
  font-size: 0.88rem;
}

.radio-content span {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.checkbox-group {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  padding: 0.5rem 0;
}

.checkbox-item {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.88rem;
  cursor: pointer;
}

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

.divider {
  border: 0;
  border-top: 1px solid var(--border-color);
  margin: 1.25rem 0;
}

.hidden { display: none !important; }

/* Settings Grid */
.settings-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.5rem;
}

.settings-actions {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

/* Toast Notifications */
.toast-container {
  position: fixed;
  bottom: 20px;
  right: 20px;
  z-index: 2000;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.toast {
  background: var(--bg-secondary);
  color: var(--text-primary);
  border: 1px solid var(--accent-primary);
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-md);
  font-size: 0.88rem;
  animation: slideInRight 0.3s forwards;
}

@keyframes slideInRight {
  from { transform: translateX(100%); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

/* Responsive adjust */
@media (max-width: 640px) {
  .header-container { flex-direction: column; align-items: flex-start; }
  .header-controls { width: 100%; justify-content: space-between; }
  .form-row { grid-template-columns: 1fr; }
  .metrics-grid { grid-template-columns: 1fr 1fr; }
}