:root {
  color-scheme: dark;
  --bg: #070b16;
  --panel: #111a31;
  --panel-hi: #1a2643;
  --line: #2f4474;
  --text: #eff4ff;
  --muted: #9eb0d3;
  --cyan: #5de6ff;
  --magenta: #ff6fd2;
  --amber: #ffcc73;
  --good: #8bffb2;
  --bad: #ff8d8d;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Trebuchet MS", "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at 15% 10%, #233c79 0%, transparent 35%),
    radial-gradient(circle at 85% 85%, #5e214f 0%, transparent 32%),
    var(--bg);
  color: var(--text);
  padding: 24px 14px;
}

.deck {
  width: min(1060px, 100%);
  margin: 0 auto;
  display: grid;
  gap: 14px;
}

.panel {
  border: 2px solid var(--line);
  border-radius: 14px;
  background: linear-gradient(180deg, rgba(255,255,255,0.02), transparent), var(--panel);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.35);
  padding: 16px;
}

.hero h1 {
  margin: 6px 0 8px;
  font-size: clamp(1.6rem, 2.8vw, 2.3rem);
  color: var(--cyan);
}

.kicker {
  margin: 0;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 0.78rem;
  color: var(--amber);
}

.subtitle {
  margin: 0;
  color: var(--muted);
  max-width: 72ch;
}

.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(110px, 1fr));
  gap: 10px;
  margin-bottom: 14px;
}

.stat {
  border: 1px solid var(--line);
  border-radius: 10px;
  background: rgba(0, 0, 0, 0.2);
  padding: 8px 10px;
}

.stat span {
  display: block;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
  margin-bottom: 4px;
}

.stat strong { font-size: 1rem; }

.layout {
  display: grid;
  gap: 12px;
  grid-template-columns: 1fr 1fr;
}

h2 {
  margin: 0 0 8px;
  font-size: 1rem;
  color: var(--amber);
}

.cart-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 7px;
}

.cart-row {
  border: 1px solid #2a3c69;
  border-radius: 9px;
  background: rgba(3, 8, 18, 0.65);
  padding: 7px 8px;
  display: flex;
  justify-content: space-between;
  gap: 10px;
}

.cart-meta {
  font-size: 0.82rem;
  color: var(--muted);
}

.totals {
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px dashed #4460a0;
  display: grid;
  gap: 8px;
}

.totals div {
  display: flex;
  justify-content: space-between;
  gap: 8px;
}

.coupon-rack {
  display: grid;
  gap: 8px;
}

.hint {
  margin: 0 0 8px;
  color: var(--muted);
  font-size: 0.87rem;
}

.coupon {
  width: 100%;
  border: 1px solid #4e6fb9;
  border-radius: 10px;
  background: linear-gradient(135deg, rgba(67, 96, 170, 0.35), rgba(203, 73, 161, 0.28));
  color: var(--text);
  padding: 10px;
  text-align: left;
  cursor: pointer;
  transition: transform 120ms ease, border-color 120ms ease, filter 120ms ease;
}

.coupon:hover:not([disabled]) {
  transform: translateY(-1px);
  border-color: var(--cyan);
  filter: brightness(1.06);
}

.coupon.used {
  opacity: 0.45;
  text-decoration: line-through;
}

.coupon[disabled] {
  cursor: not-allowed;
}

.coupon-title {
  display: block;
  font-weight: 700;
}

.coupon-desc {
  display: block;
  font-size: 0.86rem;
  color: #d7e3ff;
  margin-top: 2px;
}

.controls {
  margin-top: 14px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

button {
  border-radius: 999px;
  border: 1px solid #5d75b6;
  color: var(--text);
  background: #1f2f55;
  padding: 9px 14px;
  font-weight: 700;
  cursor: pointer;
}

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

button.primary {
  background: linear-gradient(120deg, #2f4fa5, #7a3fbe);
  border-color: #90adff;
}

.status {
  margin: 10px 0 0;
  color: var(--cyan);
  min-height: 1.4em;
}

.receipt-panel .receipt {
  margin: 0;
  border: 1px solid #3f578f;
  border-radius: 10px;
  background: #050912;
  color: #b7f6c5;
  padding: 12px;
  min-height: 230px;
  white-space: pre-wrap;
  line-height: 1.25;
  font-family: "Consolas", "Courier New", monospace;
}

.back-link {
  margin-top: 10px;
  display: inline-block;
  color: var(--amber);
  text-decoration: none;
}

.back-link:hover { text-decoration: underline; }

.good { color: var(--good); }
.bad { color: var(--bad); }

@media (max-width: 820px) {
  .layout { grid-template-columns: 1fr; }
}