:root {
  --bg: #0b0d10;
  --bg-elev: #14181d;
  --bg-elev-2: #1b2128;
  --border: #232a32;
  --text: #e8ecf1;
  --text-dim: #8b95a3;
  --accent: #5b8def;
  --accent-2: #7c5cff;
  --success: #43d17a;
  --warn: #f7b955;
  --danger: #ff5d6c;
  --radius: 10px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: 15px;
  line-height: 1.5;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 24px 20px;
}
.container--narrow { max-width: 640px; }

/* ============ navbar ============ */
.nav {
  border-bottom: 1px solid var(--border);
  background: var(--bg-elev);
}
.nav__inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 14px 20px;
  display: flex;
  align-items: center;
  gap: 18px;
}
.nav__logo {
  font-weight: 700;
  font-size: 18px;
  color: var(--text);
}
.nav__logo span { color: var(--accent); }
.nav__links { display: flex; gap: 14px; margin-left: auto; align-items: center; }
.nav__links a { color: var(--text-dim); font-size: 14px; }
.nav__links a:hover { color: var(--text); text-decoration: none; }

/* ============ hero ============ */
.hero {
  padding: 80px 20px 60px;
  text-align: center;
}
.hero h1 {
  font-size: 56px;
  margin: 0 0 12px;
  background: linear-gradient(90deg, var(--accent) 0%, var(--accent-2) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero p {
  font-size: 18px;
  color: var(--text-dim);
  max-width: 640px;
  margin: 0 auto 28px;
}

/* ============ buttons ============ */
.btn {
  display: inline-block;
  padding: 10px 18px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--bg-elev);
  color: var(--text);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  text-decoration: none;
  transition: 0.15s ease;
}
.btn:hover { background: var(--bg-elev-2); text-decoration: none; }
.btn--primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}
.btn--primary:hover { background: #4d7be0; }
.btn--success {
  background: var(--success);
  border-color: var(--success);
  color: #04150b;
}
.btn--danger {
  background: var(--danger);
  border-color: var(--danger);
  color: #fff;
}
.btn--ghost {
  background: transparent;
}
.btn--block { display: block; width: 100%; text-align: center; }
.btn--lg { padding: 14px 26px; font-size: 16px; }
.btn--sm { padding: 6px 12px; font-size: 13px; }

/* ============ cards ============ */
.card {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 18px;
}
.card h2, .card h3 { margin-top: 0; }
.card__title {
  font-size: 18px;
  margin: 0 0 14px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}

/* features grid on landing */
.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 16px;
  margin-top: 40px;
}
.feature {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
}
.feature__icon {
  font-size: 22px;
  margin-bottom: 8px;
}
.feature h3 { margin: 6px 0 6px; font-size: 16px; }
.feature p { margin: 0; color: var(--text-dim); font-size: 14px; }

/* ============ forms ============ */
.form-row {
  margin-bottom: 16px;
}
.form-row label {
  display: block;
  margin-bottom: 6px;
  font-size: 13px;
  color: var(--text-dim);
}
.form-row input,
.form-row textarea,
.form-row select {
  width: 100%;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  padding: 10px 12px;
  font-size: 14px;
  font-family: inherit;
}
.form-row textarea { min-height: 120px; resize: vertical; }
.form-row input:focus,
.form-row textarea:focus,
.form-row select:focus {
  outline: none;
  border-color: var(--accent);
}
.form-row .hint { font-size: 12px; color: var(--text-dim); margin-top: 4px; }

/* ============ alerts ============ */
.alert {
  padding: 10px 14px;
  border-radius: var(--radius);
  margin-bottom: 16px;
  font-size: 14px;
}
.alert--error   { background: rgba(255, 93, 108, 0.1); border: 1px solid var(--danger); color: var(--danger); }
.alert--success { background: rgba(67, 209, 122, 0.1); border: 1px solid var(--success); color: var(--success); }
.alert--info    { background: rgba(91, 141, 239, 0.1); border: 1px solid var(--accent);  color: var(--accent);  }

/* ============ tables ============ */
.table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}
.table th, .table td {
  text-align: left;
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
}
.table th { color: var(--text-dim); font-weight: 500; font-size: 12px; text-transform: uppercase; }
.table tr:last-child td { border-bottom: none; }

/* ============ product card grid ============ */
.products-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 18px;
}
.product-card {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: 0.15s;
}
.product-card:hover { border-color: var(--accent); transform: translateY(-2px); }
.product-card a { text-decoration: none; color: inherit; }
.product-card__cover {
  width: 100%;
  aspect-ratio: 16 / 10;
  background: var(--bg-elev-2);
  display: block;
  object-fit: cover;
}
.product-card__cover--placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-dim);
  font-size: 32px;
}
.product-card__body { padding: 14px 16px; }
.product-card__title { font-weight: 600; margin: 0 0 4px; }
.product-card__price { color: var(--accent); font-weight: 600; }
.product-card__author { color: var(--text-dim); font-size: 12px; }

/* product detail */
.product-detail {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 28px;
  margin-top: 18px;
}
@media (max-width: 760px) {
  .product-detail { grid-template-columns: 1fr; }
  .hero h1 { font-size: 38px; }
}
.product-detail__cover {
  width: 100%;
  border-radius: var(--radius);
  background: var(--bg-elev);
  aspect-ratio: 16 / 10;
  object-fit: cover;
}
.product-detail__sidebar {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  height: fit-content;
  position: sticky;
  top: 20px;
}
.product-detail__price {
  font-size: 28px;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 16px;
}

/* pay screen */
.pay-box {
  text-align: center;
  padding: 24px;
}
.pay-box__qr {
  background: #fff;
  padding: 14px;
  display: inline-block;
  border-radius: var(--radius);
  margin: 12px 0;
}
.pay-box__field {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 10px 14px;
  margin: 8px 0;
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: ui-monospace, "SF Mono", Menlo, monospace;
  font-size: 13px;
  word-break: break-all;
}
.pay-box__field code { flex: 1; text-align: left; }
.pay-box__field .btn { flex-shrink: 0; }
.pay-box__timer {
  font-size: 14px;
  color: var(--text-dim);
  margin-top: 12px;
}
.pay-box__status {
  font-size: 14px;
  color: var(--text-dim);
  margin-top: 8px;
}

/* footer */
.footer {
  border-top: 1px solid var(--border);
  margin-top: 60px;
  padding: 24px 20px;
  text-align: center;
  color: var(--text-dim);
  font-size: 13px;
}

/* utility */
.muted { color: var(--text-dim); }
.center { text-align: center; }
.row { display: flex; gap: 12px; align-items: center; }
.row--end { justify-content: flex-end; }
.hidden { display: none !important; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mb-2 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 24px; }

.badge {
  display: inline-block;
  padding: 3px 8px;
  border-radius: 999px;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.badge--pending { background: rgba(247, 185, 85, 0.15); color: var(--warn); }
.badge--paid    { background: rgba(67, 209, 122, 0.15); color: var(--success); }
.badge--sent    { background: rgba(91, 141, 239, 0.15); color: var(--accent); }
.badge--expired { background: rgba(255, 93, 108, 0.15); color: var(--danger); }
.badge--delivered { background: rgba(124, 92, 255, 0.15); color: var(--accent-2); }