:root {
  --bg0: #0b1220;
  --bg1: #12233d;
  --ink: #f4f7fb;
  --muted: #9db0c9;
  --line: rgba(120, 170, 220, 0.22);
  --cyan: #5eead4;
  --blue: #3b82f6;
  --card: rgba(18, 36, 64, 0.72);
  --ok: #34d399;
  --warn: #fbbf24;
  --danger: #f87171;
  --radius: 18px;
  --font-display: "Syne", "Noto Sans SC", sans-serif;
  --font-body: "Noto Sans SC", system-ui, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  font-family: var(--font-body);
  background:
    radial-gradient(900px 500px at 80% -10%, rgba(59, 130, 246, 0.28), transparent 55%),
    radial-gradient(700px 420px at 10% 20%, rgba(94, 234, 212, 0.14), transparent 50%),
    linear-gradient(165deg, var(--bg0), var(--bg1) 55%, #0a1628);
}

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

.wrap { width: min(1080px, calc(100% - 2rem)); margin: 0 auto; }

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.1rem 0;
  gap: 1rem;
}
.brand {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.55rem;
  letter-spacing: 0.04em;
  color: var(--ink);
  text-decoration: none;
}
.brand span { color: var(--cyan); }
.nav-links { display: flex; gap: 1rem; flex-wrap: wrap; align-items: center; }
.nav-links a { color: var(--muted); text-decoration: none; font-size: 0.95rem; }
.nav-links a:hover { color: var(--ink); }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 0;
  border-radius: 999px;
  padding: 0.78rem 1.25rem;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  transition: transform .15s ease, opacity .15s ease;
}
.btn:hover { transform: translateY(-1px); text-decoration: none; }
.btn-primary { background: linear-gradient(120deg, var(--blue), #06b6d4); color: white; }
.btn-ghost { background: transparent; color: var(--ink); border: 1px solid var(--line); }
.btn-ok { background: #059669; color: white; }
.btn-sm { padding: 0.45rem 0.85rem; font-size: 0.9rem; }

.hero {
  padding: 2.4rem 0 1.2rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.demo-section { padding-top: 0.6rem; }
.demo-frame {
  margin: 0 0 1.2rem;
  padding: 0.7rem;
  border-radius: 20px;
  background: rgba(8, 16, 30, 0.55);
  border: 1px solid var(--line);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.35);
  overflow: hidden;
  animation: rise 0.9s ease both;
}
.demo-frame img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 12px;
  background: #1a1a1a;
}
.demo-frame figcaption {
  margin-top: 0.7rem;
  color: var(--muted);
  font-size: 0.92rem;
  text-align: center;
}
.demo-points {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.85rem;
}
.demo-points .panel {
  display: grid;
  gap: 0.35rem;
}
.demo-points strong { color: var(--cyan); }
.demo-points span { color: var(--muted); font-size: 0.92rem; line-height: 1.55; }
@keyframes rise {
  from { opacity: 0; transform: translateY(18px); }
  to { opacity: 1; transform: translateY(0); }
}
@media (max-width: 820px) {
  .demo-points { grid-template-columns: 1fr; }
}
.hero-brand {
  font-family: var(--font-display);
  font-size: clamp(3.4rem, 10vw, 6.2rem);
  line-height: 0.95;
  margin: 0 0 1rem;
  font-weight: 800;
  letter-spacing: 0.02em;
}
.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 3.5vw, 2rem);
  margin: 0 0 0.8rem;
  font-weight: 700;
}
.hero p {
  max-width: 34rem;
  color: var(--muted);
  font-size: 1.05rem;
  line-height: 1.7;
  margin: 0 0 1.6rem;
}
.cta { display: flex; gap: 0.8rem; flex-wrap: wrap; }

.wave {
  height: 48px;
  margin-top: 2.2rem;
  opacity: 0.75;
  background:
    radial-gradient(circle at 10% 50%, var(--cyan) 2px, transparent 3px),
    radial-gradient(circle at 20% 40%, var(--blue) 2px, transparent 3px),
    radial-gradient(circle at 30% 60%, var(--cyan) 2px, transparent 3px),
    radial-gradient(circle at 45% 45%, var(--blue) 2px, transparent 3px),
    radial-gradient(circle at 60% 55%, var(--cyan) 2px, transparent 3px),
    radial-gradient(circle at 75% 40%, var(--blue) 2px, transparent 3px),
    radial-gradient(circle at 90% 50%, var(--cyan) 2px, transparent 3px);
  filter: blur(0.2px);
  animation: drift 8s ease-in-out infinite alternate;
}
@keyframes drift {
  from { transform: translateX(0); opacity: .55; }
  to { transform: translateX(12px); opacity: .9; }
}

section { padding: 2.4rem 0; }
section h2 {
  font-family: var(--font-display);
  font-size: 1.7rem;
  margin: 0 0 0.5rem;
}
.lead { color: var(--muted); margin: 0 0 1.4rem; max-width: 36rem; line-height: 1.7; }

.grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}
@media (max-width: 820px) {
  .grid { grid-template-columns: 1fr; }
}

.panel {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.2rem 1.25rem;
  backdrop-filter: blur(8px);
}
.panel h3 { margin: 0 0 0.45rem; font-size: 1.1rem; }
.panel p { margin: 0; color: var(--muted); line-height: 1.65; font-size: 0.95rem; }

.list { margin: 0; padding-left: 1.1rem; color: var(--muted); line-height: 1.8; }

.form {
  display: grid;
  gap: 0.9rem;
  max-width: 560px;
}
label { display: grid; gap: 0.35rem; color: var(--muted); font-size: 0.92rem; }
input, select, textarea {
  width: 100%;
  border: 1px solid var(--line);
  background: rgba(8, 16, 30, 0.65);
  color: var(--ink);
  border-radius: 12px;
  padding: 0.75rem 0.9rem;
  font: inherit;
}
textarea { min-height: 90px; resize: vertical; }

.alert {
  border-radius: 12px;
  padding: 0.8rem 1rem;
  margin: 0 0 1rem;
}
.alert-err { background: rgba(248, 113, 113, 0.12); color: #fecaca; border: 1px solid rgba(248,113,113,.35); }
.alert-ok { background: rgba(52, 211, 153, 0.12); color: #bbf7d0; border: 1px solid rgba(52,211,153,.35); }
.alert-info { background: rgba(59, 130, 246, 0.12); color: #bfdbfe; border: 1px solid rgba(59,130,246,.35); }

.codebox {
  white-space: pre-wrap;
  word-break: break-all;
  background: rgba(0,0,0,.35);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 1rem;
  font-family: ui-monospace, Consolas, monospace;
  font-size: 0.9rem;
  line-height: 1.6;
}

.table { width: 100%; border-collapse: collapse; font-size: 0.9rem; }
.table th, .table td {
  border-bottom: 1px solid var(--line);
  padding: 0.65rem 0.4rem;
  text-align: left;
  vertical-align: top;
}
.table th { color: var(--muted); font-weight: 600; }
.badge {
  display: inline-block;
  padding: 0.15rem 0.5rem;
  border-radius: 999px;
  font-size: 0.78rem;
  border: 1px solid var(--line);
}
.badge-pending { color: var(--warn); }
.badge-fulfilled { color: var(--ok); }

.footer {
  margin-top: 3rem;
  padding: 1.5rem 0 2.5rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.9rem;
}

.admin-grid {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 1rem;
}
@media (max-width: 900px) {
  .admin-grid { grid-template-columns: 1fr; }
}

.stat {
  display: flex; gap: 1rem; flex-wrap: wrap; margin-bottom: 1rem;
}
.stat .panel { min-width: 120px; flex: 1; text-align: center; }
.stat strong { display: block; font-size: 1.6rem; font-family: var(--font-display); }

.sku-options { display: grid; gap: 0.75rem; }
.sku-option {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.75rem;
  align-items: start;
  padding: 0.9rem 1rem;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: rgba(8,16,30,.4);
  cursor: pointer;
}
.sku-option:has(input:checked) {
  border-color: rgba(94, 234, 212, 0.55);
  box-shadow: 0 0 0 1px rgba(94, 234, 212, 0.25) inset;
}
.sku-option strong { color: var(--ink); display: block; margin-bottom: 0.2rem; }
.sku-option span { color: var(--muted); font-size: 0.9rem; }