:root {
  --bg: #05060f;
  --card-bg: rgba(24, 28, 38, 0.72);
  --border: rgba(255, 255, 255, 0.08);
  --text: #e8eaf0;
  --muted: #8b93a7;
  --accent: #6c8cff;
  --green: #34d399;
  --red: #f87171;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  min-height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

#bg {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  display: block;
}

main {
  position: relative;
  z-index: 1;
  max-width: 1000px;
  margin: 0 auto;
  padding: 32px 20px 80px;
}

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 28px;
}

h1 {
  font-size: 28px;
  margin: 0;
  letter-spacing: -0.02em;
}

.cash-box {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 12px 20px;
  backdrop-filter: blur(10px);
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  min-width: 160px;
}

.label {
  display: block;
  font-size: 12px;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 2px;
}

#cash-value {
  font-size: 22px;
  font-weight: 600;
}

.coins {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.coin-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 18px 20px;
  backdrop-filter: blur(10px);
  transition: transform 0.15s ease;
}

.coin-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.coin-header h2 {
  margin: 0;
  font-size: 19px;
}

.symbol {
  color: var(--muted);
  font-weight: 400;
  font-size: 14px;
  margin-left: 4px;
}

.price {
  color: var(--muted);
  font-size: 14px;
  margin-top: 2px;
}

.price-value {
  color: var(--text);
  font-weight: 600;
}

.minimize-btn {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--muted);
  border-radius: 8px;
  width: 32px;
  height: 32px;
  cursor: pointer;
  font-size: 16px;
  transition: transform 0.2s ease;
}

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

.coin-card.collapsed .chart-wrap {
  display: none;
}

.coin-card.collapsed .minimize-btn {
  transform: rotate(-90deg);
}

.coin-body {
  margin-top: 14px;
}

.stats {
  display: flex;
  gap: 28px;
  flex-wrap: wrap;
  margin-bottom: 14px;
}

.stats > div {
  display: flex;
  flex-direction: column;
}

.stats span:last-child {
  font-size: 16px;
  font-weight: 600;
}

.gainloss-value.gain { color: var(--green); }
.gainloss-value.loss { color: var(--red); }

.actions {
  display: flex;
  gap: 10px;
  margin-bottom: 16px;
}

.amount-wrap {
  position: relative;
  width: 120px;
}

.amount-prefix {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--muted);
  font-size: 14px;
  pointer-events: none;
}

.amount-input {
  width: 100%;
  padding: 10px 12px 10px 24px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.04);
  color: var(--text);
  font-size: 14px;
}

.amount-input::placeholder {
  color: var(--muted);
}

.actions button {
  flex: 1;
  padding: 10px 14px;
  border-radius: 10px;
  border: none;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: filter 0.15s ease, transform 0.1s ease;
}

.actions button:active {
  transform: scale(0.97);
}

.buy-btn {
  background: var(--green);
  color: #06281c;
}

.sell-btn {
  background: var(--red);
  color: #2c0a0a;
}

.actions button:hover {
  filter: brightness(1.08);
}

.actions button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.chart-wrap {
  border-top: 1px solid var(--border);
  padding-top: 12px;
}

.chart-controls {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 10px;
}

.btn-group {
  display: flex;
  gap: 6px;
}

.range-btn {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--muted);
  border-radius: 8px;
  padding: 4px 10px;
  font-size: 12px;
  cursor: pointer;
  transition: color 0.15s ease, border-color 0.15s ease, background 0.15s ease;
}

.range-btn:hover {
  color: var(--text);
}

.range-btn.active {
  color: var(--text);
  background: rgba(108, 140, 255, 0.18);
  border-color: var(--accent);
}

.chart {
  width: 100%;
  height: 160px;
  display: block;
}

.error-msg {
  color: var(--red);
  font-size: 13px;
  margin-top: 8px;
  min-height: 16px;
}