:root {
  --bg: #0a0a0a;
  --bg-elevated: #121212;
  --bg-card: #151515;
  --border: #242424;
  --border-soft: #1c1c1c;
  --text: #ededed;
  --text-dim: #8a8a8a;
  --text-faint: #565656;
  --accent: #f7931a;
  --accent-soft: rgba(247, 147, 26, 0.14);
  --accent-glow: rgba(247, 147, 26, 0.45);
  --green: #2ecc71;
  --red: #e94e4e;
  --mono: "SF Mono", "Menlo", "Consolas", "Roboto Mono", ui-monospace, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  --radius: 14px;
  --transition: 220ms cubic-bezier(0.4, 0, 0.2, 1);
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
}

.mono {
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
}

.bg-grid {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(247, 147, 26, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(247, 147, 26, 0.035) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, #000 30%, transparent 90%);
}

/* Header */
.site-header {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 28px clamp(16px, 4vw, 48px);
  border-bottom: 1px solid var(--border-soft);
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.brand-mark {
  color: var(--accent);
  font-size: 22px;
  text-shadow: 0 0 16px var(--accent-glow);
}

.brand-text {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.06em;
}

.brand-accent {
  color: var(--accent);
}

.header-status {
  display: flex;
  align-items: center;
}

.block-height {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 8px 16px;
}

.block-height .label {
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--text-faint);
}

.block-height .value {
  font-size: 15px;
  font-weight: 600;
  color: var(--accent);
}

/* status dot */
.dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 6px var(--green);
  flex-shrink: 0;
  transition: background var(--transition), box-shadow var(--transition);
}

.dot.dot-error {
  background: var(--red);
  box-shadow: 0 0 6px var(--red);
}

.dot.dot-pending {
  background: var(--text-faint);
  box-shadow: none;
}

/* Main layout */
main {
  position: relative;
  z-index: 1;
  max-width: 1180px;
  margin: 0 auto;
  padding: clamp(20px, 4vw, 40px) clamp(16px, 4vw, 48px) 60px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

/* Mining scene */
.scene-section {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 18px 14px;
}

.scene-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

.scene-head h2 {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--text-dim);
  margin: 0;
}

.scene-canvas-wrap {
  width: 100%;
  display: flex;
  justify-content: center;
  overflow: hidden;
  border-radius: 8px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-soft);
}

.scene-canvas {
  display: block;
  /* width/height are set inline by app.js to an integer logical->device
     scale, then centered by the flex wrapper — no CSS stretch here, that
     would reintroduce fractional scaling and blur the pixel art. */
  image-rendering: pixelated;
  image-rendering: crisp-edges;
}

.scene-foot {
  margin-top: 10px;
  font-size: 11px;
  color: var(--text-faint);
}

/* Fee cards */
.fee-section {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.fee-card {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px 22px 20px;
  overflow: hidden;
  transition: border-color var(--transition), transform var(--transition);
}

.fee-card-glow {
  position: absolute;
  inset: -40% -40% auto auto;
  width: 160px;
  height: 160px;
  background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
  opacity: 0;
  pointer-events: none;
  transition: opacity 600ms ease;
}

.fee-card.pulse .fee-card-glow {
  opacity: 1;
  animation: fee-pulse 900ms ease-out;
}

@keyframes fee-pulse {
  0% { opacity: 0; transform: scale(0.6); }
  40% { opacity: 1; transform: scale(1); }
  100% { opacity: 0; transform: scale(1.15); }
}

.fee-card[data-tier="fast"] { border-color: rgba(247, 147, 26, 0.35); }

.fee-card-head {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 14px;
}

.fee-icon {
  font-size: 14px;
}

.fee-title {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--text-dim);
  flex: 1;
}

.fee-value {
  font-size: clamp(34px, 6vw, 44px);
  font-weight: 700;
  color: var(--text);
  line-height: 1;
  transition: color var(--transition);
}

.fee-card[data-tier="fast"] .fee-value {
  color: var(--accent);
}

.fee-unit {
  font-size: 12px;
  color: var(--text-faint);
  margin-top: 6px;
}

.fee-sub {
  font-size: 12px;
  color: var(--text-faint);
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px solid var(--border-soft);
}

/* Two column grid */
.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}

/* Panels */
.panel {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
}

.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 18px;
}

.panel-head h2 {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--text-dim);
  margin: 0;
}

/* Next block */
.next-block-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-bottom: 20px;
}

.stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.stat-label {
  font-size: 11px;
  color: var(--text-faint);
}

.stat-value {
  font-size: 18px;
  font-weight: 600;
  color: var(--text);
}

.stat-unit {
  font-size: 10px;
  color: var(--text-faint);
}

.fill-bar-wrap {
  margin-top: 4px;
}

.fill-bar-label {
  display: flex;
  justify-content: space-between;
  font-size: 11px;
  color: var(--text-dim);
  margin-bottom: 8px;
}

.fill-bar-track {
  height: 10px;
  border-radius: 999px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-soft);
  overflow: hidden;
}

.fill-bar-fg {
  height: 100%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--accent), #ffb347);
  box-shadow: 0 0 10px var(--accent-glow);
  transition: width 800ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* Hashrate */
.hashrate-main {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin-bottom: 14px;
}

.hashrate-value {
  font-size: 36px;
  font-weight: 700;
  color: var(--accent);
}

.hashrate-unit {
  font-size: 14px;
  color: var(--text-faint);
}

.sparkline {
  display: block;
  width: 100%;
  height: 60px;
}

.hashrate-foot {
  margin-top: 10px;
  font-size: 11px;
  color: var(--text-faint);
}

/* Difficulty */
.diff-body {
  display: flex;
  align-items: center;
  gap: 26px;
}

.diff-ring-wrap {
  position: relative;
  width: 120px;
  height: 120px;
  flex-shrink: 0;
}

.diff-ring {
  width: 120px;
  height: 120px;
  transform: rotate(-90deg);
}

.diff-ring-bg {
  fill: none;
  stroke: var(--bg-elevated);
  stroke-width: 8;
}

.diff-ring-fg {
  fill: none;
  stroke: var(--accent);
  stroke-width: 8;
  stroke-linecap: round;
  stroke-dasharray: 327;
  stroke-dashoffset: 327;
  filter: drop-shadow(0 0 6px var(--accent-glow));
  transition: stroke-dashoffset 900ms cubic-bezier(0.4, 0, 0.2, 1), stroke var(--transition);
}

.diff-ring-center {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
}

.diff-ring-center .mono {
  font-size: 20px;
  font-weight: 700;
}

.diff-ring-sublabel {
  font-size: 9px;
  color: var(--text-faint);
  letter-spacing: 0.04em;
}

.diff-stats {
  display: flex;
  flex-direction: column;
  gap: 14px;
  flex: 1;
  min-width: 0;
}

.diff-stats .stat-value.positive {
  color: var(--red);
}

.diff-stats .stat-value.negative {
  color: var(--green);
}

/* Calculator */
.calc-body {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.calc-label {
  font-size: 11px;
  color: var(--text-faint);
  margin-top: 6px;
}

.calc-input,
.calc-select {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  padding: 10px 12px;
  font-size: 14px;
  width: 100%;
  outline: none;
  transition: border-color var(--transition);
}

.calc-input:focus,
.calc-select:focus {
  border-color: var(--accent);
}

.preset-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 4px 0 6px;
}

.preset-btn {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  color: var(--text-dim);
  border-radius: 999px;
  padding: 6px 12px;
  font-size: 11px;
  cursor: pointer;
  transition: border-color var(--transition), color var(--transition), background var(--transition);
}

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

.preset-btn.active {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-soft);
}

.calc-output {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-top: 14px;
  padding-top: 16px;
  border-top: 1px solid var(--border-soft);
}

.calc-result {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.calc-result-label {
  font-size: 11px;
  color: var(--text-faint);
}

.calc-result-value {
  font-size: 20px;
  font-weight: 700;
  color: var(--accent);
}

/* Footer */
.site-footer {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 20px;
  font-size: 11px;
  color: var(--text-faint);
  border-top: 1px solid var(--border-soft);
}

.site-footer a {
  color: inherit;
}

.site-footer a:hover {
  color: var(--accent);
}

/* Responsive */
@media (max-width: 860px) {
  .grid-2 {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .fee-section {
    grid-template-columns: 1fr;
  }

  .next-block-stats {
    grid-template-columns: 1fr 1fr;
  }

  .diff-body {
    flex-direction: column;
    align-items: flex-start;
  }

  .site-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 14px;
  }

  .calc-output {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 400px) {
  .next-block-stats {
    grid-template-columns: 1fr;
  }
}