/* === CSS Variables for Theming === */
:root {
  --bg: #020817;
  --bg-sidebar: #0f172a;
  --bg-card: #1e293b;
  --text: #f8fafc;
  --text-muted: #cbd5e1;
  --border: #334155;
  --accent: #ff8000;
  --accent-hover: #e67300;
  --input-bg: #1e293b;
}

body.light {
  --bg: #f8fafc;
  --bg-sidebar: #ffffff;
  --bg-card: #f1f5f9;
  --text: #0f172a;
  --text-muted: #64748b;
  --border: #e2e8f0;
  --accent: #ea580c;
  --accent-hover: #c2410c;
  --input-bg: #ffffff;
}

body {
  background-color: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  margin: 0;
  padding: 0;
}

.container-fluid {
  padding: 0;
}

.row {
  margin: 0;
}

/* Sidebar styles */
.sidebar {
  background-color: var(--bg-sidebar);
  min-height: 100vh;
  max-height: 100vh;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 2rem 1.5rem;
  border-right: 1px solid var(--border);
}

.sidebar h2 {
  color: var(--accent);
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 2rem;
}

/* Form styles */
.form-group label {
  color: var(--text);
  font-size: 0.9rem;
  font-weight: 500;
  margin-bottom: 0.5rem;
}

.form-control {
  background-color: var(--input-bg);
  border: 1px solid var(--border);
  color: var(--text);
  font-size: 0.9rem;
  padding: 0.5rem 0.75rem;
}

.form-control:focus {
  background-color: var(--input-bg);
  border-color: var(--accent);
  color: var(--text);
  box-shadow: 0 0 0 0.2rem rgba(255, 128, 0, 0.25);
}

.form-control option {
  background-color: var(--input-bg);
  color: var(--text);
}

small a {
  color: var(--accent);
  font-size: 0.85rem;
}

small a:hover {
  color: var(--accent-hover);
  text-decoration: underline;
}

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

/* Button styles */
.btn-primary {
  background-color: var(--accent);
  border: none;
  color: #fff;
  font-weight: 600;
  padding: 0.75rem;
  transition: all 0.2s;
}

.btn-primary:hover {
  background-color: var(--accent-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(255, 128, 0, 0.4);
}

.btn-primary:active {
  background-color: #cc6600;
  transform: translateY(0);
}

/* Content area */
.content {
  padding: 2rem;
  overflow-y: auto;
  max-height: 100vh;
}

.content h3 {
  color: var(--accent);
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
}

/* Table styles */
.table-dark {
  background-color: var(--bg-sidebar);
  color: var(--text);
}

.table-dark thead th {
  background-color: var(--bg-card);
  border-color: var(--border);
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0.5rem;
  text-transform: uppercase;
  letter-spacing: 0.025em;
}

.table-dark tbody td {
  border-color: var(--border);
  font-size: 0.85rem;
  padding: 0.5rem;
}

.table-striped tbody tr:nth-of-type(odd) {
  background-color: rgba(30, 41, 59, 0.5);
}

body.light .table-striped tbody tr:nth-of-type(odd) {
  background-color: rgba(226, 232, 240, 0.4);
}

.table-responsive {
  margin-top: 2rem;
}

/* Chart containers */
#chart1, #chart2, #chart3 {
  background-color: var(--bg-sidebar);
  border-radius: 8px;
  padding: 1rem;
  margin-bottom: 1rem;
}

/* Modal styles */
.modal {
  z-index: 1150 !important;
}

.modal-content {
  background-color: var(--bg-sidebar);
  color: var(--text);
  border: 1px solid var(--border);
}

.modal-header {
  border-bottom: 1px solid var(--border);
}

.modal-title {
  color: var(--accent);
}

.modal-body h6 {
  color: var(--accent);
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.modal-body ul {
  margin-left: 1rem;
}

.modal-body li {
  margin-bottom: 0.5rem;
}

/* Welcome screen */
.text-center img {
  border-radius: 8px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
}

.lead {
  color: var(--text-muted);
  font-size: 1.1rem;
}

/* Scrollbar styling */
::-webkit-scrollbar {
  width: 10px;
}

::-webkit-scrollbar-track {
  background: var(--bg-sidebar);
}

::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
  background: #475569;
}

/* Responsive adjustments */
@media (max-width: 768px) {
  .sidebar {
    min-height: auto;
    border-right: none;
    border-bottom: 1px solid var(--border);
  }
  .content {
    max-height: none;
  }
}

/* =============================================
   HEADER BAR (Share + Theme Toggle)
   ============================================= */
.header-bar {
  position: fixed;
  top: 1rem;
  right: 1rem;
  z-index: 1100;
  display: flex;
  gap: 0.5rem;
}

.header-btn {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 1rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg-sidebar);
  color: var(--text);
  cursor: pointer;
  font-size: 0.875rem;
  transition: all 0.15s;
  font-family: inherit;
}

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

/* =============================================
   MODEL TILES
   ============================================= */
.model-tiles {
  margin-bottom: 0.5rem;
}

.model-section {
  margin-bottom: 0.75rem;
}

.model-section-label {
  font-size: 0.7rem;
  color: var(--text-muted);
  margin-bottom: 0.3rem;
}

.model-tile-row {
  display: flex;
  gap: 0.4rem;
}

.model-tile {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 0.55rem 0.3rem;
  border: 2px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  cursor: pointer;
  transition: all 0.15s;
  text-align: center;
  box-sizing: border-box;
  max-width: 100%;
  min-width: 0;
}

.model-tile:hover {
  border-color: var(--accent);
}

.model-tile.active {
  border-color: var(--accent);
  background: rgba(255, 128, 0, 0.08);
}

.model-tile .model-radio {
  display: none;
}

.model-tile .model-tile-label {
  font-size: 0.65rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.model-tile .model-tile-name {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text);
  margin-top: 0.1rem;
}

.model-tile .model-tile-rate {
  font-size: 0.68rem;
  color: var(--accent);
  margin-top: 0.1rem;
}

/* =============================================
   ADVANCED CAGR SECTION
   ============================================= */
#advanced-toggle {
  width: 100%;
  border: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.78rem;
  background: transparent;
  padding: 0.4rem;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.15s;
}

#advanced-toggle:hover {
  color: var(--accent);
  border-color: var(--accent);
}

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

.btn-outline-secondary.active {
  background-color: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

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

.btn-outline-secondary.active:hover {
  color: #fff;
}

body.light .btn-outline-secondary.active {
  color: #fff;
}

/* =============================================
   SUMMARY BANNER
   ============================================= */
.summary-banner {
  background: var(--bg-sidebar);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.9rem 1.5rem;
  margin-bottom: 1.5rem;
  color: var(--text);
  font-size: 0.92rem;
  line-height: 1.6;
}

.summary-banner strong {
  color: var(--accent);
}

/* =============================================
   STARTING POINT BANNER
   ============================================= */
.starting-point-banner {
  background: var(--bg-sidebar);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem 1.5rem;
  margin-bottom: 1.5rem;
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  color: var(--text);
  font-size: 0.9rem;
  line-height: 1.5;
}

.starting-point-icon {
  font-size: 1.25rem;
  flex-shrink: 0;
  margin-top: 0.1rem;
}

.starting-point-content {
  flex: 1;
}

.starting-point-content strong {
  color: var(--accent);
}

.starting-point-content small {
  display: block;
  margin-top: 0.3rem;
}

.starting-point-content a {
  color: var(--accent);
  font-weight: 500;
}

.starting-point-content a:hover {
  color: var(--accent-hover);
}

.summary-cards {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 2rem;
  flex-wrap: wrap;
}

.stat-card {
  flex: 1;
  min-width: 140px;
  background: var(--bg-sidebar);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.9rem 0.75rem;
  text-align: center;
}

.stat-card .stat-label {
  font-size: 0.7rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.4rem;
}

.stat-card .stat-value {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--accent);
}

/* =============================================
   FITS ACRONYM (styled abbreviation)
   ============================================= */
.fits-acronym {
  border-bottom: 1px dashed var(--accent);
  text-decoration: none;
  cursor: help;
  font-weight: 700;
  color: inherit;
  position: relative;
}

.fits-tooltip-wrapper {
  display: inline-block;
  position: relative;
}

.fits-tooltip-wrapper .fits-tooltip-text {
  visibility: hidden;
  background-color: var(--bg-card);
  color: var(--text);
  text-align: left;
  border-radius: 6px;
  padding: 6px 10px;
  position: absolute;
  z-index: 10;
  top: calc(100% + 6px);
  left: 0;
  transform: none;
  white-space: normal;
  max-width: 240px;
  width: max-content;
  font-size: 0.78rem;
  font-weight: 400;
  border: 1px solid var(--accent);
  box-shadow: 0 2px 8px rgba(0,0,0,0.4);
  line-height: 1.4;
}

.fits-tooltip-wrapper .fits-tooltip-text::after {
  content: "";
  position: absolute;
  bottom: 100%;
  left: 12px;
  margin-left: 0;
  border-width: 5px;
  border-style: solid;
  border-color: transparent transparent var(--accent) transparent;
}

.fits-tooltip-wrapper:hover .fits-tooltip-text {
  visibility: visible;
}

/* =============================================
   FITS TOOLTIP (question mark icons)
   ============================================= */
.fits-tooltip {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--border);
  color: var(--text);
  font-size: 0.6rem;
  font-weight: 700;
  cursor: help;
  margin-left: 0.3rem;
  position: relative;
  vertical-align: middle;
  border-bottom: none;
}

.fits-tooltip .fits-tooltip-text {
  visibility: hidden;
  background-color: var(--bg-card);
  color: var(--text);
  text-align: left;
  border-radius: 6px;
  padding: 6px 10px;
  position: absolute;
  z-index: 10;
  top: calc(100% + 6px);
  left: 0;
  transform: none;
  white-space: normal;
  max-width: 240px;
  width: max-content;
  font-size: 0.78rem;
  font-weight: 400;
  border: 1px solid var(--accent);
  box-shadow: 0 2px 8px rgba(0,0,0,0.4);
  line-height: 1.4;
}

.fits-tooltip .fits-tooltip-text::after {
  content: "";
  position: absolute;
  bottom: 100%;
  left: 12px;
  margin-left: 0;
  border-width: 5px;
  border-style: solid;
  border-color: transparent transparent var(--accent) transparent;
}

.fits-tooltip:hover .fits-tooltip-text {
  visibility: visible;
}

/* =============================================
   BITCOIN FITS — Donate button + modal
   ============================================= */
.donate-fab {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 1000;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.85rem 1.6rem;
  border: none;
  border-radius: 50px;
  background: linear-gradient(135deg, #ff8000, #ffa040);
  color: #000;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: 0.95rem;
  font-weight: 700;
  cursor: pointer;
  box-shadow: 0 8px 24px rgba(255, 128, 0, 0.4);
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  animation: donatePulse 2.5s ease-in-out infinite;
}

.donate-fab:hover {
  transform: translateY(-3px) scale(1.05);
  box-shadow: 0 12px 32px rgba(255, 128, 0, 0.55);
}

.donate-fab:active {
  transform: translateY(-1px) scale(0.98);
}

@keyframes donatePulse {
  0%, 100% { box-shadow: 0 8px 24px rgba(255, 128, 0, 0.4); }
  50% { box-shadow: 0 8px 32px rgba(255, 128, 0, 0.6); }
}

.donate-modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(6px);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}

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

.donate-modal {
  position: relative;
  width: 90%;
  max-width: 380px;
  padding: 2rem;
  background: #0f172a;
  border: 1px solid #1e293b;
  border-radius: 10px;
  box-shadow: 0 0 40px rgba(255, 128, 0, 0.12), 0 16px 48px rgba(0, 0, 0, 0.5);
  transform: translateY(20px) scale(0.96);
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.donate-modal-overlay.open .donate-modal {
  transform: translateY(0) scale(1);
}

.donate-modal-close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: none;
  border: none;
  color: #cbd5e1;
  font-size: 1.6rem;
  cursor: pointer;
  line-height: 1;
  padding: 0;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: background 0.15s, color 0.15s;
}

.donate-modal-close:hover {
  background: #1e293b;
  color: #f8fafc;
}

.donate-modal-header {
  text-align: center;
  margin-bottom: 1.5rem;
}

.donate-modal-header h3 {
  margin-top: 0.5rem;
  font-size: 1.35rem;
  font-weight: 700;
  color: #ff8000;
}

.donate-modal-header p {
  color: #cbd5e1;
  font-size: 0.85rem;
}

.donate-modal-qr {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.25rem;
  padding: 1rem;
  background: #020817;
  border: 1px solid #1e293b;
  border-radius: 10px;
}

.donate-modal-qr img {
  width: 200px;
  height: 200px;
  border-radius: 8px;
  position: relative;
  z-index: 2;
}

.donate-qr-glow {
  position: absolute;
  width: 180px;
  height: 180px;
  background: radial-gradient(circle, rgba(255, 128, 0, 0.15), transparent 70%);
  z-index: 1;
}

.donate-modal-address {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
  padding: 0.55rem 1rem;
  background: #020817;
  border: 1px solid #1e293b;
  border-radius: 10px;
}

.donate-modal-address code {
  font-family: monospace;
  font-size: 0.95rem;
  color: #ff8000;
  font-weight: 600;
}

.donate-modal-invoice {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}

.donate-modal-invoice input {
  flex: 1;
  padding: 0.6rem 0.85rem;
  background: #020817;
  border: 1px solid #1e293b;
  border-radius: 10px;
  color: #f8fafc;
  font-family: monospace;
  font-size: 0.78rem;
  outline: none;
}

.donate-modal-invoice input:focus {
  border-color: #ff8000;
}

.donate-copy-btn {
  padding: 0.6rem 1.1rem;
  background: #ff8000;
  border: none;
  border-radius: 10px;
  color: #000;
  font-weight: 600;
  font-size: 0.82rem;
  cursor: pointer;
  white-space: nowrap;
  transition: filter 0.15s;
}

.donate-copy-btn:hover {
  filter: brightness(1.15);
}

.donate-copy-btn.copied {
  background: #4ade80;
}

.donate-modal-note {
  text-align: center;
  color: #cbd5e1;
  font-size: 0.78rem;
  font-style: italic;
  margin-top: 0.5rem;
}

@media (max-width: 768px) {
  .donate-fab {
    bottom: 1.25rem;
    right: 1.25rem;
    padding: 0.7rem 1.2rem;
    font-size: 0.85rem;
  }
  .donate-modal {
    padding: 1.5rem;
  }
  .donate-modal-qr img {
    width: 160px;
    height: 160px;
  }
}

/* =============================================
   RESPONSIVE — summary + tiles
   ============================================= */
@media (max-width: 768px) {
  .summary-cards {
    flex-direction: column;
  }
  .stat-card {
    min-width: auto;
  }
  .model-tile-row {
    flex-direction: column;
  }
  .header-bar {
    top: 0.5rem;
    right: 0.5rem;
  }
}

/* =============================================
   ALERT STYLES (welcome page)
   ============================================= */
.alert {
  background-color: var(--bg-sidebar);
  border: 1px solid var(--border);
  color: var(--text);
}

.alert-danger {
  border-color: #f43f5e;
  color: #f43f5e;
}

.alert-warning {
  border-color: var(--accent);
}

.alert-heading {
  color: var(--accent);
}