/* =============================================
   CSS Custom Properties
   ============================================= */
:root {
  --bg:           #0f0f0f;
  --surface:      #1a1a1a;
  --surface-alt:  #222222;
  --border:       #2e2e2e;
  --text:         #e8e8e8;
  --text-muted:   #888888;
  --accent:       #f7931a;   /* Bitcoin orange */
  --accent-dim:   rgba(247, 147, 26, 0.15);
  --green:        #34c759;
  --red:          #ff3b30;
  --radius:       12px;
  --radius-sm:    8px;
  --transition:   0.15s ease;
  --max-width:    860px;
  --font:         -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
}

/* =============================================
   Reset & Base
   ============================================= */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  line-height: 1.6;
  padding: 24px 16px 48px;
}

/* =============================================
   Layout
   ============================================= */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 16px;
}

/* =============================================
   Header
   ============================================= */
.site-header {
  text-align: center;
  padding: 32px 0 24px;
}

.site-header h1 {
  font-size: clamp(1.5rem, 4vw, 2.25rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
}

.subtitle {
  color: var(--text-muted);
  margin-top: 8px;
  font-size: 1rem;
}

/* =============================================
   Section Headings
   ============================================= */
h2 {
  font-size: 1.1rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin-bottom: 16px;
  color: var(--text);
}

.section-note {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 16px;
  line-height: 1.5;
}

/* =============================================
   Form Fields
   ============================================= */
.field-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
  flex: 1;
}

.field-row {
  display: flex;
  gap: 12px;
  margin-bottom: 14px;
}

.field-group:not(:last-of-type) {
  margin-bottom: 14px;
}

.field-row .field-group {
  margin-bottom: 0;
}

label {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  display: flex;
  align-items: center;
  gap: 6px;
}

input[type="number"],
select {
  background: var(--surface-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-family: var(--font);
  font-size: 0.95rem;
  padding: 10px 12px;
  width: 100%;
  transition: border-color var(--transition);
  appearance: none;
  -webkit-appearance: none;
}

input[type="number"]:focus,
select:focus {
  outline: none;
  border-color: var(--accent);
}

input[type="number"]::placeholder {
  color: var(--text-muted);
}

select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%23888' stroke-width='1.5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 32px;
  cursor: pointer;
}

select option,
select optgroup {
  background: var(--surface-alt);
  color: var(--text);
}

/* =============================================
   Live Data Badges
   ============================================= */
.live-badge {
  font-size: 0.7rem;
  font-weight: 400;
  text-transform: none;
  letter-spacing: 0;
  color: var(--accent);
  background: var(--accent-dim);
  padding: 2px 7px;
  border-radius: 20px;
}

.live-badge.error {
  color: var(--red);
  background: rgba(255, 59, 48, 0.12);
}

.live-badge.live {
  color: var(--green);
  background: rgba(52, 199, 89, 0.12);
}

.live-data-note {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 2px;
  margin-bottom: 20px;
}

/* =============================================
   Input with inline unit selector
   ============================================= */
.input-with-unit {
  display: flex;
}

.input-with-unit input {
  border-radius: var(--radius-sm) 0 0 var(--radius-sm);
  border-right: none;
  flex: 1;
  min-width: 0;
}

.input-with-unit input:focus {
  position: relative;
  z-index: 1;
}

.input-with-unit select {
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  border-left: 1px solid var(--border);
  width: auto;
  min-width: 76px;
  flex-shrink: 0;
  padding-left: 10px;
  padding-right: 28px;
}

/* =============================================
   Info Button + Tooltip
   ============================================= */
.info-btn {
  background: none;
  border: 1.5px solid var(--text-muted);
  border-radius: 50%;
  color: var(--text-muted);
  cursor: pointer;
  font-family: var(--font);
  font-size: 0.6rem;
  font-weight: 700;
  font-style: italic;
  line-height: 1;
  width: 15px;
  height: 15px;
  padding: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  vertical-align: middle;
  transition: border-color var(--transition), color var(--transition), background var(--transition);
}

.info-btn:hover,
.info-btn:focus {
  border-color: var(--accent);
  color: var(--accent);
  outline: none;
}

.info-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #000;
}

.tooltip-popup {
  position: fixed;
  background: #252525;
  border: 1px solid #3a3a3a;
  border-radius: var(--radius-sm);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
  color: var(--text);
  font-size: 0.85rem;
  font-weight: 400;
  letter-spacing: 0;
  text-transform: none;
  line-height: 1.55;
  max-width: 272px;
  padding: 12px 14px;
  z-index: 9999;
  pointer-events: none;
  opacity: 0;
  transform: translateY(4px);
  transition: opacity 0.12s ease, transform 0.12s ease;
}

.tooltip-popup.visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

/* =============================================
   Calculate Button
   ============================================= */
.btn-calculate {
  background: var(--accent);
  border: none;
  border-radius: var(--radius-sm);
  color: #000;
  cursor: pointer;
  font-family: var(--font);
  font-size: 1rem;
  font-weight: 600;
  padding: 13px 24px;
  width: 100%;
  transition: opacity var(--transition), transform var(--transition);
  margin-top: 4px;
}

.btn-calculate:hover {
  opacity: 0.9;
}

.btn-calculate:active {
  transform: scale(0.99);
}

/* =============================================
   Hidden state
   ============================================= */
.hidden {
  display: none !important;
}

/* =============================================
   Rewards Table
   ============================================= */
.results-table {
  width: 100%;
}

.results-header,
.results-row {
  display: grid;
  grid-template-columns: 1.6fr repeat(3, minmax(72px, 1fr));
  gap: 8px;
  padding: 10px 0;
  border-bottom: 1px solid var(--border);
  align-items: center;
}

.results-header {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  font-weight: 600;
}

.results-header span:not(:first-child),
.results-row span:not(.row-label) {
  text-align: right;
}

.row-label {
  font-size: 0.875rem;
  color: var(--text-muted);
}

.highlight-row .row-label,
.highlight-row span {
  color: var(--accent);
  font-weight: 700;
  font-size: 1rem;
}

.cost-row span:not(.row-label) {
  color: var(--red);
}

.net-row span:not(.row-label) {
  font-weight: 600;
}

.positive { color: var(--green) !important; }
.negative { color: var(--red) !important; }

/* =============================================
   Stat Grid
   ============================================= */
.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 12px;
}

.stat-block {
  background: var(--surface-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 16px;
}

.stat-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 6px;
}

.stat-value {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text);
  line-height: 1.2;
  word-break: break-word;
}

.stat-sub {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* =============================================
   Compare Block
   ============================================= */
.compare-block {
  background: var(--surface-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 16px 20px;
  font-size: 0.95rem;
  line-height: 1.7;
}

.compare-block strong {
  color: var(--accent);
}

/* =============================================
   Sensitivity Table
   ============================================= */
.table-scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.sensitivity-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
  min-width: 440px;
}

.sensitivity-table th,
.sensitivity-table td {
  padding: 9px 12px;
  text-align: center;
  border: 1px solid var(--border);
  white-space: nowrap;
}

.sensitivity-table th {
  background: var(--surface-alt);
  color: var(--text-muted);
  font-weight: 600;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.sensitivity-table td {
  color: var(--text);
}

.sensitivity-table td.current-cell {
  background: var(--accent-dim);
  color: var(--accent);
  font-weight: 700;
  border-color: var(--accent);
}

.sensitivity-table td.never {
  color: var(--red);
  font-size: 0.8rem;
}

/* =============================================
   Solo/Pool Toggle
   ============================================= */
.toggle-group {
  display: inline-flex;
  background: var(--surface-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 3px;
  margin-bottom: 16px;
}

.toggle-btn {
  background: none;
  border: none;
  border-radius: 6px;
  color: var(--text-muted);
  cursor: pointer;
  font-family: var(--font);
  font-size: 0.875rem;
  font-weight: 500;
  padding: 7px 16px;
  transition: background var(--transition), color var(--transition);
}

.toggle-btn.active {
  background: var(--accent);
  color: #000;
  font-weight: 600;
}

.mode-panel {
  animation: fadeIn 0.15s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to   { opacity: 1; transform: translateY(0); }
}

.mode-description {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 16px;
}

/* =============================================
   Simple mode
   ============================================= */
.calc-mode-row {
  display: flex;
  justify-content: center;
  margin-bottom: 20px;
}

#simple-inputs .field-group {
  margin-bottom: 14px;
}

.simple-results {
  margin-top: 24px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}

.simple-stat-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.simple-stat {
  background: var(--surface-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 16px 12px;
  text-align: center;
}

.simple-stat-label {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  margin-bottom: 10px;
}

.simple-period {
  opacity: 0.6;
}

.simple-stat-primary {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--accent);
  line-height: 1.2;
  margin-bottom: 4px;
  word-break: break-word;
}

.simple-stat-secondary {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 6px;
}

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

.simple-stat-primary.positive { color: var(--green); }
.simple-stat-primary.negative { color: var(--red); }
.simple-stat-fiat.positive    { color: var(--green); }
.simple-stat-fiat.negative    { color: var(--red); }

.simple-disclaimer {
  text-align: center;
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 14px;
}

@media (max-width: 480px) {
  .simple-stat-grid {
    grid-template-columns: 1fr;
  }
}

/* =============================================
   Disclaimer
   ============================================= */
.disclaimer {
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-muted);
  padding: 12px 0 0;
}

/* =============================================
   Responsive — narrow (< 600px)
   ============================================= */
@media (max-width: 599px) {
  .field-row {
    flex-direction: column;
  }

  .results-header,
  .results-row {
    grid-template-columns: 1.2fr repeat(3, 1fr);
    font-size: 0.78rem;
  }

  .results-header span,
  .results-row span {
    font-size: 0.78rem;
  }

  .highlight-row span {
    font-size: 0.85rem;
  }

  .stat-grid {
    grid-template-columns: 1fr 1fr;
  }

  .stat-value {
    font-size: 1.05rem;
  }
}

/* =============================================
   Responsive — medium (800px+)
   ============================================= */
@media (min-width: 800px) {
  body {
    padding: 32px 24px 64px;
  }

  .card {
    padding: 28px 32px;
  }
}