/* 币连 / Bilian — Style C light portal foundation */
:root {
  color-scheme: light;
  --bg: #f7f5f2;
  --ink: #171717;
  --muted: #706d68;
  --line: #e5e0d9;
  --card: #ffffff;
  --accent: #f0c94b;
  --mint: #cdeee0;
  --danger: #a43c32;
  --shadow: 0 16px 40px rgba(35, 30, 22, 0.08);
}

* { box-sizing: border-box; }

html { min-width: 320px; }

body {
  min-height: 100vh;
  margin: 0;
  padding: 1.25rem clamp(1rem, 4vw, 4rem) 4rem;
  color: var(--ink);
  background-color: var(--bg);
  background-image:
    radial-gradient(circle at 8% 0%, rgba(248, 211, 89, 0.32), transparent 28rem),
    radial-gradient(circle at 96% 8%, rgba(174, 229, 207, 0.36), transparent 30rem);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.6;
}

nav {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.8rem 1.15rem;
  width: min(100%, 960px);
  margin: 0 auto 3rem;
}

nav > strong,
.brand {
  color: var(--ink);
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

nav a,
a { color: inherit; }
nav a { text-decoration: none; }
nav a:hover { text-decoration: underline; text-underline-offset: 0.2em; }
.lang { margin-left: auto; color: var(--muted); }

body > h1,
body > p,
body > form,
body > .flash,
body > .card,
body > .billing-card,
body > .suburl,
body > .deposit { width: min(100%, 720px); margin-right: auto; margin-left: auto; }

h1, h2, h3 { line-height: 1.15; letter-spacing: -0.03em; }
h1 { margin: 0 0 1.25rem; font-size: clamp(2rem, 5vw, 3.5rem); }
h2 { margin-top: 0; }
p { margin: 0 0 1rem; }

.card,
.billing-card {
  margin-top: 1.5rem;
  padding: clamp(1.25rem, 3vw, 2rem);
  border: 1px solid var(--line);
  border-radius: 1.25rem;
  background: var(--card);
  box-shadow: var(--shadow);
}

.billing-card { margin-bottom: 1.5rem; }

form { margin: 1.5rem 0; }
nav form { margin: 0; }
label { display: block; margin: 1rem 0 0.35rem; font-weight: 650; }
input[type="text"],
input[type="password"],
input[type="email"] {
  width: 100%;
  min-height: 2.8rem;
  padding: 0.65rem 0.8rem;
  border: 1px solid #d6d0c8;
  border-radius: 0.65rem;
  color: var(--ink);
  background: #fff;
  font: inherit;
}
input:focus-visible { outline: 3px solid rgba(240, 201, 75, 0.45); outline-offset: 2px; }

button,
.btn,
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.8rem;
  padding: 0.65rem 1.15rem;
  border: 1px solid var(--ink);
  border-radius: 999px;
  color: #fff;
  background: var(--ink);
  font: inherit;
  font-weight: 700;
  line-height: 1.2;
  cursor: pointer;
  text-decoration: none;
}
button:hover,
.btn:hover,
.btn-primary:hover { background: #3b3936; }
button:focus-visible,
.btn:focus-visible { outline: 3px solid rgba(240, 201, 75, 0.6); outline-offset: 3px; }

.hero {
  position: relative;
  overflow: hidden;
  margin: 0 auto 2rem;
  padding: clamp(2rem, 8vw, 6rem) clamp(1.25rem, 6vw, 5rem);
  border: 1px solid rgba(229, 224, 217, 0.75);
  border-radius: 2rem;
  background:
    radial-gradient(circle at 12% 18%, rgba(248, 211, 89, 0.72), transparent 26%),
    radial-gradient(circle at 86% 78%, rgba(174, 229, 207, 0.72), transparent 30%),
    #fff;
  box-shadow: var(--shadow);
}
.hero-content { position: relative; max-width: 46rem; }

.flash {
  width: min(100%, 720px);
  margin: 0 auto 1.25rem;
  padding: 0.8rem 1rem;
  border: 1px solid #e6d99c;
  border-radius: 0.75rem;
  background: #fff9db;
}
.flash.err,
.err { border-color: #e7b7b0; background: #fff0ee; color: var(--danger); }

.suburl,
.deposit {
  width: min(100%, 720px);
  margin: 0.75rem auto 1.25rem;
  padding: 0.85rem 1rem;
  border: 1px solid var(--line);
  border-radius: 0.75rem;
  background: #fff;
  overflow-wrap: anywhere;
}
.suburl { word-break: break-all; }
.deposit {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  word-break: break-all;
  user-select: all;
}
.qr { display: block; width: min(100%, 220px); max-width: 220px; height: auto; margin: 1rem auto; }
.muted { color: var(--muted); background: #efede9; }
code { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }

@media (max-width: 600px) {
  nav { margin-bottom: 2rem; }
  .lang { width: 100%; margin-left: 0; }
  h1 { font-size: 2.3rem; }
}