:root {
  --bg: #05070f;
  --bg2: #0b1224;
  --card: rgba(14, 22, 44, 0.78);
  --line: rgba(120, 170, 255, 0.18);
  --text: #eaf0ff;
  --muted: #93a0c2;
  --cyan: #3de7ff;
  --blue: #4f7cff;
  --violet: #8b5cff;
  --green: #3dffb0;
  --warn: #ffb84d;
  --danger: #ff5d7a;
  --glow: 0 0 40px rgba(61, 231, 255, 0.25);
  --radius: 18px;
  --font: "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; background: var(--bg); color: var(--text); font-family: var(--font); }
body {
  min-height: 100vh;
  background:
    radial-gradient(1200px 600px at 10% -10%, rgba(79,124,255,.35), transparent 55%),
    radial-gradient(900px 500px at 90% 0%, rgba(139,92,255,.28), transparent 50%),
    radial-gradient(700px 400px at 50% 100%, rgba(61,231,255,.12), transparent 60%),
    var(--bg);
}
a { color: var(--cyan); text-decoration: none; }
a:hover { text-decoration: underline; }
.container { width: min(1120px, calc(100% - 2rem)); margin: 0 auto; }
.nav {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: blur(16px);
  background: rgba(5,7,15,.72);
  border-bottom: 1px solid var(--line);
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; padding: 0.9rem 0; gap: 1rem; }
.brand { display: flex; align-items: center; gap: .7rem; font-weight: 700; letter-spacing: .02em; color: var(--text); text-decoration: none; }
.brand-mark {
  width: 34px; height: 34px; border-radius: 10px;
  background: linear-gradient(135deg, var(--cyan), var(--violet));
  box-shadow: var(--glow);
  display: grid; place-items: center; font-size: 14px;
}
.nav-links { display: flex; gap: .8rem; align-items: center; flex-wrap: wrap; }
.nav-links a { color: var(--muted); text-decoration: none; font-size: .95rem; }
.nav-links a:hover { color: var(--text); }
.btn {
  appearance: none; border: 0; cursor: pointer;
  border-radius: 999px; padding: .72rem 1.15rem;
  font-weight: 650; color: #041018;
  background: linear-gradient(135deg, var(--cyan), #6ea8ff);
  box-shadow: var(--glow);
  transition: transform .15s ease, filter .15s ease;
}
.btn:hover { transform: translateY(-1px); filter: brightness(1.05); }
.btn.secondary {
  color: var(--text);
  background: rgba(255,255,255,.06);
  border: 1px solid var(--line);
  box-shadow: none;
}
.btn.ghost {
  background: transparent; color: var(--cyan);
  border: 1px solid rgba(61,231,255,.35); box-shadow: none;
}
.btn.danger { background: linear-gradient(135deg, #ff5d7a, #ff8f5d); color: #1a0508; }
.hero { padding: 4.2rem 0 2.5rem; }
.hero-grid { display: grid; grid-template-columns: 1.2fr .8fr; gap: 2rem; align-items: center; }
@media (max-width: 860px) { .hero-grid { grid-template-columns: 1fr; } }
.eyebrow {
  display: inline-flex; align-items: center; gap: .45rem;
  padding: .35rem .7rem; border-radius: 999px;
  border: 1px solid var(--line); color: var(--cyan); font-size: .82rem;
  background: rgba(61,231,255,.06);
}
h1 { font-size: clamp(2rem, 4vw, 3.2rem); line-height: 1.12; margin: 1rem 0 .8rem; }
.lead { color: var(--muted); font-size: 1.08rem; line-height: 1.7; max-width: 54ch; }
.hero-actions { display: flex; gap: .8rem; flex-wrap: wrap; margin-top: 1.5rem; }
.panel {
  border: 1px solid var(--line); border-radius: var(--radius);
  background: var(--card); backdrop-filter: blur(12px);
  padding: 1.2rem; box-shadow: 0 20px 60px rgba(0,0,0,.35);
}
.stat-row { display: grid; grid-template-columns: repeat(3,1fr); gap: .7rem; }
.stat { text-align: center; padding: .8rem .4rem; border-radius: 14px; background: rgba(255,255,255,.03); border: 1px solid var(--line); }
.stat b { display: block; font-size: 1.15rem; color: var(--cyan); }
.stat span { color: var(--muted); font-size: .78rem; }
.section { padding: 2.2rem 0 3.5rem; }
.section h2 { font-size: 1.6rem; margin: 0 0 .4rem; }
.section .sub { color: var(--muted); margin-bottom: 1.4rem; }
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; }
@media (max-width: 900px) { .cards { grid-template-columns: 1fr; } }
.card {
  position: relative; overflow: hidden;
  border: 1px solid var(--line); border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(20,30,58,.9), rgba(10,14,28,.9));
  padding: 1.3rem; display: flex; flex-direction: column; gap: .7rem;
}
.card.featured { border-color: rgba(61,231,255,.45); box-shadow: var(--glow); }
.card .tag {
  align-self: flex-start; font-size: .75rem; color: var(--cyan);
  border: 1px solid rgba(61,231,255,.3); border-radius: 999px; padding: .2rem .55rem;
}
.card h3 { margin: 0; font-size: 1.25rem; }
.price { font-size: 2rem; font-weight: 800; letter-spacing: -.02em; }
.price small { font-size: .95rem; color: var(--muted); font-weight: 500; }
.features { list-style: none; padding: 0; margin: .4rem 0 1rem; color: var(--muted); }
.features li { padding: .28rem 0 .28rem 1.2rem; position: relative; }
.features li::before { content: "✓"; position: absolute; left: 0; color: var(--green); }
.steps {
  list-style: none; counter-reset: step; padding: 0; margin: .4rem 0 0;
  color: var(--muted); display: grid; gap: .55rem;
}
.steps li {
  counter-increment: step; position: relative; padding: .35rem 0 .35rem 2.4rem;
  line-height: 1.55;
}
.steps li::before {
  content: counter(step);
  position: absolute; left: 0; top: .2rem;
  width: 1.7rem; height: 1.7rem; border-radius: 999px;
  display: grid; place-items: center;
  font-size: .85rem; font-weight: 700; color: #041018;
  background: linear-gradient(135deg, var(--cyan), var(--violet));
}

.buy-cta {
  display: flex;
  flex-wrap: wrap;
  gap: .85rem;
  align-items: center;
  margin-top: 1.35rem;
  padding-top: 1.1rem;
  border-top: 1px solid var(--line);
}
.buy-cta .btn {
  min-width: 7.5rem;
  text-align: center;
  text-decoration: none;
}
.footer { border-top: 1px solid var(--line); padding: 1.5rem 0 2.5rem; color: var(--muted); font-size: .9rem; }
.footer-inner { display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap; }
.page { padding: 2rem 0 3rem; }
.form-row { display: grid; gap: .45rem; margin-bottom: 1rem; }
label { color: var(--muted); font-size: .9rem; }
input, select, textarea {
  width: 100%; border-radius: 12px; border: 1px solid var(--line);
  background: rgba(0,0,0,.28); color: var(--text); padding: .8rem .9rem; font: inherit;
}
input:focus, select:focus, textarea:focus { outline: 1px solid rgba(61,231,255,.5); }
.mono { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }
.badge {
  display: inline-flex; align-items: center; gap: .35rem;
  border-radius: 999px; padding: .2rem .55rem; font-size: .78rem;
  border: 1px solid var(--line); color: var(--muted);
}
.badge.pending { color: var(--warn); border-color: rgba(255,184,77,.35); }
.badge.paid { color: var(--cyan); border-color: rgba(61,231,255,.35); }
.badge.shipped { color: var(--green); border-color: rgba(61,255,176,.35); }
.badge.cancelled { color: var(--danger); border-color: rgba(255,93,122,.35); }
.pay-box { display: grid; gap: .8rem; }
.pay-item {
  padding: .9rem 1rem; border-radius: 14px; border: 1px solid var(--line);
  background: rgba(255,255,255,.03);
}
.pay-item .k { color: var(--muted); font-size: .82rem; }
.pay-item .v { word-break: break-all; margin-top: .25rem; }
.copy-btn { margin-left: .5rem; font-size: .78rem; }
.chat-fab {
  position: fixed; right: 1.1rem; bottom: 1.1rem; z-index: 80;
  border: 0; border-radius: 999px; padding: .9rem 1.15rem;
  background: linear-gradient(135deg, var(--violet), var(--cyan));
  color: #061018; font-weight: 700; cursor: pointer; box-shadow: var(--glow);
}
.chat-panel {
  position: fixed; right: 1.1rem; bottom: 4.4rem; z-index: 80;
  width: min(380px, calc(100vw - 1.5rem)); height: min(520px, calc(100vh - 6rem));
  display: none; flex-direction: column;
  border-radius: 18px; overflow: hidden;
  border: 1px solid var(--line); background: rgba(8,12,24,.96);
  box-shadow: 0 25px 80px rgba(0,0,0,.5);
}
.chat-panel.open { display: flex; }
.chat-head {
  display: flex; justify-content: space-between; align-items: center;
  padding: .85rem 1rem; border-bottom: 1px solid var(--line);
  background: linear-gradient(90deg, rgba(79,124,255,.2), rgba(139,92,255,.15));
}
.chat-msgs { flex: 1; overflow: auto; padding: 1rem; display: flex; flex-direction: column; gap: .55rem; }
.bubble {
  max-width: 85%; padding: .65rem .8rem; border-radius: 14px; font-size: .92rem; line-height: 1.45;
  white-space: pre-wrap; word-break: break-word;
}
.bubble.visitor { align-self: flex-end; background: linear-gradient(135deg, #3a6dff, #5b8cff); color: white; }
.bubble.admin { align-self: flex-start; background: rgba(255,255,255,.08); border: 1px solid var(--line); }
.bubble.system { align-self: center; color: var(--muted); font-size: .8rem; background: transparent; }
.chat-input { display: flex; gap: .5rem; padding: .75rem; border-top: 1px solid var(--line); }
.chat-input input { flex: 1; }
.table { width: 100%; border-collapse: collapse; font-size: .9rem; }
.table th, .table td { text-align: left; padding: .65rem .5rem; border-bottom: 1px solid var(--line); vertical-align: top; }
.table th { color: var(--muted); font-weight: 600; }
.admin-layout { display: grid; grid-template-columns: 220px 1fr; gap: 1rem; }
@media (max-width: 800px) { .admin-layout { grid-template-columns: 1fr; } }
.side-nav a {
  display: block; padding: .65rem .8rem; border-radius: 10px; color: var(--muted); text-decoration: none; margin-bottom: .25rem;
}
.side-nav a.active, .side-nav a:hover { background: rgba(255,255,255,.06); color: var(--text); }
.muted { color: var(--muted); }
.ok { color: var(--green); }
.err { color: var(--danger); }
.hidden { display: none !important; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
@media (max-width: 700px) { .grid-2 { grid-template-columns: 1fr; } }

.brand-logo { height: 36px; width: auto; display: block; }
.brand { gap: .55rem; }
.brand-mark { display: none; }
.hero-logo { width: min(420px, 100%); height: auto; margin: 0.4rem 0 1rem; filter: drop-shadow(0 0 28px rgba(61,231,255,.25)); }


/* chat sender labels */
.msg { display: flex; flex-direction: column; max-width: 85%; gap: .2rem; }
.msg.visitor { align-self: flex-end; align-items: flex-end; }
.msg.admin, .msg.system { align-self: flex-start; align-items: flex-start; }
.msg-who {
  font-size: .72rem; font-weight: 700; letter-spacing: .02em;
  color: var(--cyan); opacity: .9; padding: 0 .15rem;
}
.msg.visitor .msg-who { color: #b8c9ff; }
.msg .bubble { max-width: 100%; }

/* payment QR */
.pay-row { display: flex; gap: 1rem; align-items: flex-start; flex-wrap: wrap; margin-top: .55rem; }
.pay-qr {
  flex: 0 0 auto; padding: .55rem; border-radius: 14px;
  background: #fff; border: 1px solid var(--line);
  display: grid; place-items: center;
}
.pay-qr img, .pay-qr canvas { display: block; width: 148px; height: 148px; }
.pay-addr { flex: 1 1 220px; min-width: 0; }
.pay-qr-hint { color: var(--muted); font-size: .78rem; margin-top: .35rem; text-align: center; }

/* admin chat unread badge */
.side-nav a { position: relative; }
.side-nav .tab-badge {
  display: inline-flex; align-items: center; justify-content: center;
  min-width: 1.15rem; height: 1.15rem; padding: 0 .35rem;
  margin-left: .4rem; border-radius: 999px;
  background: #ff3b5c; color: #fff; font-size: .7rem; font-weight: 800;
  line-height: 1; vertical-align: middle;
}
.side-nav .tab-badge.hidden { display: none !important; }