:root {
  --blue: #3b82f6;
  --blue-600: #2563eb;
  --blue-700: #1d4ed8;
  --ink: #0f172a;
  --muted: #64748b;
  --bg: #f6f8fb;
  --card: #ffffff;
  --border: #e5e9f0;
  --green: #16a34a;
  --red: #dc2626;
  --shadow: 0 10px 30px rgba(15, 23, 42, .08);
  --radius: 16px;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: Inter, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #070b14; --card: #111827; --border: #1f2937; --ink: #e5e7eb; --muted: #94a3b8;
    --shadow: 0 10px 30px rgba(0,0,0,.5);
  }
}
a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: underline; }
.container { max-width: 1100px; margin: 0 auto; padding: 0 20px; }
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 12px 20px; border-radius: 12px; border: 1px solid transparent;
  font-weight: 600; font-size: 15px; cursor: pointer; transition: .15s; white-space: nowrap;
}
.btn-primary { background: var(--blue); color: #fff; }
.btn-primary:hover { background: var(--blue-600); text-decoration: none; }
.btn-ghost { background: transparent; border-color: var(--border); color: var(--ink); }
.btn-ghost:hover { border-color: var(--blue); text-decoration: none; }
.btn-danger { background: var(--red); color: #fff; }
.btn-lg { padding: 15px 28px; font-size: 16px; }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.input, select, textarea {
  width: 100%; padding: 12px 14px; border-radius: 12px; border: 1px solid var(--border);
  background: var(--card); color: var(--ink); font-size: 15px; outline: none; font-family: inherit;
}
.input:focus, select:focus, textarea:focus { border-color: var(--blue); }
label { font-size: 13px; color: var(--muted); font-weight: 600; display: block; margin: 14px 0 6px; }

/* Header */
header.site {
  position: sticky; top: 0; z-index: 50; backdrop-filter: blur(10px);
  background: color-mix(in srgb, var(--card) 85%, transparent); border-bottom: 1px solid var(--border);
}
.nav { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.logo { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 19px; color: var(--ink); }
.logo .mark { width: 30px; height: 30px; border-radius: 9px; background: linear-gradient(135deg, #3b82f6, #06b6d4); display: grid; place-items: center; color: #fff; font-weight: 900; }
.nav-links { display: flex; gap: 22px; align-items: center; }
.nav-links a { color: var(--muted); font-weight: 600; }
.nav-links a:hover { color: var(--ink); text-decoration: none; }

/* Hero */
.hero { text-align: center; padding: 90px 0 60px; }
.hero .eyebrow { color: var(--blue); font-weight: 700; letter-spacing: .5px; }
.hero h1 { font-size: 52px; line-height: 1.1; margin: 14px 0; font-weight: 800; }
.hero h1 .grad { background: linear-gradient(120deg, #3b82f6, #06b6d4); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero p.lead { color: var(--muted); max-width: 640px; margin: 0 auto 28px; font-size: 18px; }
.hero-actions { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }
.chains-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 14px; margin-top: 36px; }
.chain-card { background: var(--card); border: 1px solid var(--border); border-radius: 14px; padding: 16px; display: flex; align-items: center; gap: 12px; transition: .15s; }
.chain-card:hover { transform: translateY(-3px); box-shadow: var(--shadow); border-color: var(--blue); }
.chain-card img { width: 34px; height: 34px; }
.chain-card .nm { font-weight: 700; }
.chain-card .sy { color: var(--muted); font-size: 13px; }

.features { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px,1fr)); gap: 20px; padding: 60px 0; }
.feature { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 26px; box-shadow: var(--shadow); }
.feature .ic { width: 44px; height: 44px; border-radius: 12px; background: color-mix(in srgb, var(--blue) 15%, transparent); color: var(--blue); display: grid; place-items: center; font-size: 22px; margin-bottom: 14px; }
.feature h3 { margin: 0 0 8px; }
.feature p { color: var(--muted); margin: 0; }

.section-title { text-align: center; margin: 30px 0 10px; font-size: 30px; font-weight: 800; }

/* Footer */
footer.site { border-top: 1px solid var(--border); margin-top: 40px; padding: 40px 0; color: var(--muted); }
.footer-cols { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 20px; }
.footer-cols a { color: var(--muted); margin-right: 16px; }

/* Wallet app */
.app-shell { min-height: 100vh; display: flex; flex-direction: column; }
.topbar { display: flex; align-items: center; justify-content: space-between; height: 60px; padding: 0 20px; border-bottom: 1px solid var(--border); background: var(--card); }
.wallet-home { padding: 24px 20px 80px; }
.portfolio { background: linear-gradient(135deg, #3b82f6, #06b6d4); color: #fff; border-radius: 20px; padding: 28px; box-shadow: var(--shadow); }
.portfolio .total { font-size: 40px; font-weight: 800; margin: 6px 0; }
.portfolio .sub { opacity: .9; }
.asset-list { display: grid; gap: 10px; margin-top: 22px; }
.asset-row { background: var(--card); border: 1px solid var(--border); border-radius: 14px; padding: 14px 16px; display: flex; align-items: center; gap: 14px; cursor: pointer; transition: .15s; }
.asset-row:hover { border-color: var(--blue); transform: translateY(-2px); }
.asset-row img { width: 38px; height: 38px; }
.asset-row .nm { font-weight: 700; }
.asset-row .sy { color: var(--muted); font-size: 13px; }
.asset-row .bal { margin-left: auto; text-align: right; }
.asset-row .bal .v { font-weight: 700; }
.asset-row .bal .fiat { color: var(--muted); font-size: 13px; }

/* Chain detail */
.chain-detail { max-width: 760px; margin: 24px auto; padding: 0 20px; }
.panel { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 22px; box-shadow: var(--shadow); margin-bottom: 18px; }
.addr-box { display: flex; align-items: center; gap: 10px; background: var(--bg); border: 1px dashed var(--border); border-radius: 12px; padding: 12px 14px; word-break: break-all; font-family: ui-monospace, monospace; font-size: 13px; }
.row-actions { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 14px; }
.token-row { display: flex; justify-content: space-between; padding: 10px 0; border-bottom: 1px solid var(--border); }
.tx-row { font-size: 13px; padding: 8px 0; border-bottom: 1px solid var(--border); }
.tx-row .hash { font-family: ui-monospace, monospace; }
.muted { color: var(--muted); }
.center { text-align: center; }
.qr { display: grid; place-items: center; padding: 16px; }
.badge { display: inline-block; font-size: 12px; padding: 2px 8px; border-radius: 999px; background: color-mix(in srgb, var(--blue) 15%, transparent); color: var(--blue); font-weight: 700; }
.badge.warn { background: color-mix(in srgb, #f59e0b 18%, transparent); color: #b45309; }

/* Auth / setup */
.auth-wrap { max-width: 560px; margin: 50px auto; padding: 0 20px; }
.auth-card { background: var(--card); border: 1px solid var(--border); border-radius: 20px; padding: 30px; box-shadow: var(--shadow); }
.mnemonic-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin: 16px 0; }
.mnemonic-word { background: var(--bg); border: 1px solid var(--border); border-radius: 10px; padding: 10px 12px; font-family: ui-monospace, monospace; }
.warn-box { background: color-mix(in srgb, #f59e0b 12%, transparent); border: 1px solid #f59e0b; color: #92400e; border-radius: 12px; padding: 14px; font-size: 14px; }
@media (prefers-color-scheme: dark){ .warn-box{ color:#fde68a; } }
.toast { position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%); background: var(--ink); color: #fff; padding: 12px 20px; border-radius: 12px; box-shadow: var(--shadow); z-index: 999; opacity: 0; transition: .25s; }
.toast.show { opacity: 1; }
.tabs { display: flex; gap: 8px; margin-bottom: 18px; }
.tabs button { flex: 1; padding: 10px; border-radius: 10px; border: 1px solid var(--border); background: var(--card); color: var(--muted); font-weight: 600; cursor: pointer; }
.tabs button.active { background: var(--blue); color: #fff; border-color: var(--blue); }
.loading { text-align: center; color: var(--muted); padding: 30px; }
.spinner { width: 26px; height: 26px; border: 3px solid var(--border); border-top-color: var(--blue); border-radius: 50%; animation: spin .8s linear infinite; margin: 0 auto 10px; }
@keyframes spin { to { transform: rotate(360deg); } }
.hidden { display: none !important; }
.small { font-size: 13px; }
.flex { display:flex; gap:10px; align-items:center; }
.between { justify-content: space-between; }
.grow { flex: 1; }
.mt { margin-top: 16px; }
.mb { margin-bottom: 16px; }
.text-red { color: var(--red); }