/* STUDYtable Zen White Minimalist Design System */
:root {
  --bg-canvas: #ffffff;
  --bg-surface: #fafafa;
  --bg-subtle: #f4f4f5;
  --text-primary: #09090b;
  --text-secondary: #71717a;
  --text-muted: #a1a1aa;
  --border-hairline: #e4e4e7;
  --border-subtle: #f0f0f2;
  --accent-black: #18181b;
  --accent-emerald: #059669;
  --accent-amber: #d97706;
  --accent-rose: #e11d48;
  --font-stack: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --shadow-subtle: 0 1px 3px rgba(0, 0, 0, 0.04);
  --shadow-modal: 0 20px 40px -15px rgba(0, 0, 0, 0.08);
}

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

body {
  font-family: var(--font-stack);
  background-color: var(--bg-canvas);
  color: var(--text-primary);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

/* Typography & General Utilities */
h1, h2, h3, h4 {
  font-weight: 500;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.text-muted {
  color: var(--text-secondary);
}

.text-sm {
  font-size: 0.85rem;
}

.font-medium {
  font-weight: 500;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: inherit;
  font-size: 0.875rem;
  font-weight: 500;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.15s ease;
  background: transparent;
  color: var(--text-primary);
  text-decoration: none;
}

.btn-primary {
  background-color: var(--accent-black);
  color: #ffffff;
}

.btn-primary:hover {
  background-color: #27272a;
}

.btn-secondary {
  background-color: #ffffff;
  border-color: var(--border-hairline);
  color: var(--text-primary);
}

.btn-secondary:hover {
  background-color: var(--bg-surface);
  border-color: #d4d4d8;
}

.btn-ghost {
  color: var(--text-secondary);
}

.btn-ghost:hover {
  color: var(--text-primary);
  background-color: var(--bg-surface);
}

.btn-sm {
  padding: 5px 12px;
  font-size: 0.8rem;
}

.btn-block {
  width: 100%;
}

.btn-link {
  background: none;
  border: none;
  color: var(--text-primary);
  text-decoration: underline;
  cursor: pointer;
  font-size: 0.85rem;
  font-family: inherit;
  padding: 0;
  margin-left: 8px;
}

.btn-link:hover {
  color: #000000;
}

/* Badges */
.badge-subtle {
  display: inline-flex;
  align-items: center;
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  background: var(--bg-subtle);
  color: var(--text-secondary);
  border: 1px solid var(--border-hairline);
}

.badge-outline {
  display: inline-flex;
  align-items: center;
  font-size: 0.75rem;
  padding: 3px 8px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-hairline);
  color: var(--text-secondary);
}

.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.78rem;
  font-weight: 500;
  padding: 3px 10px;
  border-radius: 9999px;
  text-transform: capitalize;
}

.status-pill::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
}

.status-pill.status-active {
  background-color: #ecfdf5;
  color: var(--accent-emerald);
}
.status-pill.status-active::before {
  background-color: var(--accent-emerald);
}

.status-pill.status-trial {
  background-color: #fef3c7;
  color: var(--accent-amber);
}
.status-pill.status-trial::before {
  background-color: var(--accent-amber);
}

.status-pill.status-expired,
.status-pill.status-paused {
  background-color: #f4f4f5;
  color: var(--text-secondary);
}
.status-pill.status-expired::before,
.status-pill.status-paused::before {
  background-color: var(--text-muted);
}

/* Authentication Screen */
.login-view {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background: #fafafb;
}

.login-card {
  width: 100%;
  max-width: 380px;
  background: #ffffff;
  padding: 40px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-hairline);
  box-shadow: var(--shadow-modal);
}

.brand-heading {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
}

.brand-title {
  font-size: 1.15rem;
  font-weight: 600;
  letter-spacing: -0.03em;
  color: var(--text-primary);
}

.login-subtext {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 28px;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

.form-group input,
.input-clean,
.select-clean {
  width: 100%;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-hairline);
  font-family: inherit;
  font-size: 0.875rem;
  background: #ffffff;
  color: var(--text-primary);
  outline: none;
  transition: border-color 0.15s ease;
}

.form-group input:focus,
.input-clean:focus,
.select-clean:focus {
  border-color: var(--accent-black);
}

.error-text {
  font-size: 0.8rem;
  color: var(--accent-rose);
  margin-top: 12px;
  text-align: center;
}

/* App Shell & Navigation */
.app-shell {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.top-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 40px;
  border-bottom: 1px solid var(--border-hairline);
  background: #ffffff;
  position: sticky;
  top: 0;
  z-index: 50;
}

.nav-left {
  display: flex;
  align-items: center;
  gap: 20px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: 16px;
  background: var(--bg-surface);
  padding: 3px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-hairline);
}

.nav-tab {
  background: none;
  border: none;
  padding: 6px 14px;
  font-size: 0.825rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
  cursor: pointer;
  color: var(--text-secondary);
  transition: all 0.15s ease;
}

.nav-tab.active {
  background: #ffffff;
  color: var(--text-primary);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 14px;
}

.meta-label {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

/* Content Container */
.content-container {
  flex: 1;
  max-width: 1280px;
  width: 100%;
  margin: 0 auto;
  padding: 40px;
}

.portal-view {
  display: none;
}

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

/* Metrics Grid (Hero Section) */
.metrics-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-bottom: 24px;
}

.metric-card {
  background: var(--bg-canvas);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-md);
  padding: 24px;
  transition: border-color 0.15s ease;
}

.metric-card:hover {
  border-color: #d4d4d8;
}

.metric-title {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-secondary);
  letter-spacing: -0.01em;
}

.metric-value-row {
  margin: 12px 0 8px 0;
}

.metric-number {
  font-size: 2.25rem;
  font-weight: 600;
  letter-spacing: -0.04em;
  color: var(--text-primary);
  font-variant-numeric: tabular-nums;
  line-height: 1;
}

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

/* Zen Notice Banner */
.zen-banner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-surface);
  border: 1px solid var(--border-hairline);
  padding: 12px 20px;
  border-radius: var(--radius-sm);
  font-size: 0.825rem;
  color: var(--text-secondary);
  margin-bottom: 32px;
}

/* Charts Grid */
.charts-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-bottom: 36px;
}

.chart-card {
  background: var(--bg-canvas);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-md);
  padding: 24px;
}

.chart-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}

.chart-title {
  font-size: 0.95rem;
  font-weight: 500;
}

.chart-wrapper {
  position: relative;
  height: 240px;
  width: 100%;
}

/* Sections & Tables */
.section-card {
  background: var(--bg-canvas);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-md);
  padding: 24px;
}

.section-header {
  margin-bottom: 20px;
}

.section-header.row-between {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
}

.section-title {
  font-size: 1.15rem;
  font-weight: 500;
  margin-bottom: 4px;
}

.section-subtext {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

/* Filters Bar */
.filters-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 24px;
}

.search-box {
  flex: 1;
  max-width: 460px;
}

.search-box input {
  width: 100%;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-hairline);
  font-family: inherit;
  font-size: 0.875rem;
  background: var(--bg-surface);
  outline: none;
}

.search-box input:focus {
  background: #ffffff;
  border-color: var(--accent-black);
}

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

.zen-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
  text-align: left;
}

.zen-table th {
  padding: 14px 18px;
  font-weight: 500;
  font-size: 0.78rem;
  color: var(--text-secondary);
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-hairline);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.zen-table td {
  padding: 16px 18px;
  border-bottom: 1px solid var(--border-subtle);
  color: var(--text-primary);
  font-variant-numeric: tabular-nums;
  vertical-align: middle;
}

.zen-table tbody tr {
  transition: background-color 0.1s ease;
}

.zen-table tbody tr:hover {
  background-color: #fafafb;
}

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

.table-rank {
  font-weight: 600;
  color: var(--text-secondary);
}

.sub-meta-line {
  font-size: 0.78rem;
  color: var(--text-secondary);
  margin-top: 3px;
}

/* Modals & Slide-out Drawers */
.modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.25);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: 24px;
}

.modal-content {
  background: #ffffff;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-hairline);
  box-shadow: var(--shadow-modal);
  width: 100%;
  max-width: 640px;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.modal-compact {
  max-width: 440px;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  border-bottom: 1px solid var(--border-hairline);
}

.modal-title {
  font-size: 1.05rem;
  font-weight: 500;
}

.modal-close-btn {
  background: none;
  border: none;
  font-size: 1.5rem;
  line-height: 1;
  color: var(--text-muted);
  cursor: pointer;
}

.modal-close-btn:hover {
  color: var(--text-primary);
}

.modal-body {
  padding: 24px;
  overflow-y: auto;
}

.modal-footer {
  padding: 16px 24px;
  border-top: 1px solid var(--border-hairline);
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 12px;
  background: var(--bg-surface);
}

.modal-actions-row {
  margin-top: 24px;
  border-top: none;
  padding: 0;
  background: transparent;
}

.target-user-summary {
  background: var(--bg-surface);
  border: 1px solid var(--border-hairline);
  padding: 14px 16px;
  border-radius: var(--radius-sm);
  margin-bottom: 20px;
}

.preset-buttons {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 6px;
}

.preset-pill {
  background: var(--bg-surface);
  border: 1px solid var(--border-hairline);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  font-size: 0.78rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s ease;
}

.preset-pill:hover,
.preset-pill.active {
  background: var(--accent-black);
  color: #ffffff;
  border-color: var(--accent-black);
}

/* User Detail Drawer Content */
.detail-section {
  margin-bottom: 24px;
}

.detail-section-title {
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.detail-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.detail-item {
  background: var(--bg-surface);
  border: 1px solid var(--border-hairline);
  padding: 12px 14px;
  border-radius: var(--radius-sm);
}

.detail-item-label {
  font-size: 0.72rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  margin-bottom: 4px;
}

.detail-item-val {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-primary);
  word-break: break-all;
}

/* Toast Notifications */
.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 200;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.toast {
  background: var(--accent-black);
  color: #ffffff;
  padding: 12px 18px;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
  animation: slideUp 0.2s ease;
}

@keyframes slideUp {
  from {
    transform: translateY(12px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

/* Responsive adjustments */
@media (max-width: 960px) {
  .metrics-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .charts-grid {
    grid-template-columns: 1fr;
  }
  .top-nav {
    padding: 14px 20px;
  }
  .content-container {
    padding: 20px;
  }
}

@media (max-width: 600px) {
  .metrics-grid {
    grid-template-columns: 1fr;
  }
  .filters-bar {
    flex-direction: column;
    align-items: stretch;
  }
  .search-box {
    max-width: none;
  }
}