:root {
  color-scheme: light;
  --bg: #f2f6fb;
  --surface: rgba(255, 255, 255, 0.9);
  --panel: #e9f2fc;
  --text: #10213a;
  --muted: #66758a;
  --line: #d8e2ef;
  --primary: #1677ff;
  --green: #0aa66f;
  --red: #e5484d;
  --shadow: 0 24px 70px rgba(55, 78, 112, 0.16);
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #07111f;
  --surface: rgba(13, 27, 47, 0.94);
  --panel: #0a1a2d;
  --text: #eef6ff;
  --muted: #94a7bf;
  --line: #263b55;
  --primary: #3d91ff;
  --green: #26d894;
  --red: #ff6b70;
  --shadow: 0 28px 90px rgba(0, 0, 0, 0.38);
}

* { box-sizing: border-box; }

html, body { min-height: 100%; }

body {
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at 16% 18%, color-mix(in srgb, var(--primary) 13%, transparent), transparent 34%),
    linear-gradient(145deg, var(--bg), var(--panel));
  font-family: Inter, "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  transition: color .2s ease, background .2s ease;
}

button, input { font: inherit; }

.hidden { display: none !important; }

.theme-button {
  position: fixed;
  z-index: 5;
  top: 22px;
  right: 24px;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  border-radius: 13px;
  color: var(--text);
  background: var(--surface);
  box-shadow: 0 8px 24px rgba(30, 63, 103, .1);
  cursor: pointer;
}

.dark-icon { display: none; }
:root[data-theme="dark"] .light-icon { display: none; }
:root[data-theme="dark"] .dark-icon { display: inline; }

.login-layout {
  width: min(1180px, calc(100% - 48px));
  min-height: 100vh;
  margin: auto;
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(360px, .8fr);
  align-items: center;
  gap: 72px;
}

.brand-panel { position: relative; padding: 60px 24px; }

.brand-mark {
  width: 58px;
  height: 58px;
  display: grid;
  place-items: center;
  border-radius: 17px;
  color: #fff;
  background: linear-gradient(145deg, var(--primary), #29b3ff);
  box-shadow: 0 14px 34px color-mix(in srgb, var(--primary) 30%, transparent);
  font-size: 30px;
  font-weight: 800;
}

.eyebrow {
  margin: 34px 0 10px;
  color: var(--primary);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: .2em;
}

h1 { margin: 0; font-size: clamp(54px, 7vw, 86px); line-height: 1; letter-spacing: -.06em; }
.subtitle { margin: 20px 0 42px; color: var(--muted); font-size: 24px; letter-spacing: .16em; }

.market-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.market-strip article {
  display: grid;
  gap: 6px;
  padding: 15px 16px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: color-mix(in srgb, var(--surface) 86%, transparent);
}

.market-strip span { color: var(--muted); font-size: 12px; }
.market-strip strong { font-size: 17px; }
.market-strip b { color: var(--green); font-size: 13px; }

.trend-line {
  height: 140px;
  margin-top: 20px;
  padding: 14px 10px 0;
  border: 1px solid var(--line);
  border-radius: 16px;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 48px 38px;
  opacity: .82;
}

.trend-line svg { width: 100%; height: 100%; overflow: visible; }
.trend-line path { fill: none; stroke: var(--primary); stroke-width: 3; vector-effect: non-scaling-stroke; }

.login-panel { display: flex; justify-content: center; }

.login-card {
  width: min(100%, 430px);
  padding: 42px;
  border: 1px solid var(--line);
  border-radius: 24px;
  background: var(--surface);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

.lock-mark {
  width: 48px;
  height: 48px;
  display: grid;
  place-items: center;
  margin-bottom: 25px;
  border-radius: 14px;
  color: #fff;
  background: var(--primary);
  font-size: 19px;
}

h2 { margin: 0; font-size: 28px; letter-spacing: -.03em; }
.login-note { margin: 9px 0 28px; color: var(--muted); font-size: 14px; }

.login-error {
  margin: 0 0 18px;
  padding: 11px 13px;
  border: 1px solid color-mix(in srgb, var(--red) 35%, transparent);
  border-radius: 10px;
  color: var(--red);
  background: color-mix(in srgb, var(--red) 8%, transparent);
  font-size: 13px;
}

form { display: grid; gap: 18px; }
label { display: grid; gap: 8px; }
label span { color: var(--muted); font-size: 13px; font-weight: 650; }

input {
  width: 100%;
  height: 48px;
  padding: 0 14px;
  border: 1px solid var(--line);
  border-radius: 11px;
  outline: none;
  color: var(--text);
  background: color-mix(in srgb, var(--surface) 74%, var(--bg));
  transition: border .16s ease, box-shadow .16s ease;
}

input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--primary) 14%, transparent);
}

.login-button {
  height: 49px;
  margin-top: 4px;
  border: 0;
  border-radius: 11px;
  color: #fff;
  background: linear-gradient(135deg, var(--primary), #2d9cff);
  box-shadow: 0 12px 26px color-mix(in srgb, var(--primary) 25%, transparent);
  font-weight: 750;
  cursor: pointer;
}

.login-button:hover { filter: brightness(1.04); transform: translateY(-1px); }

.ip-note {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin: 26px 0 0;
  color: var(--muted);
  font-size: 12px;
}

.ip-note span { width: 7px; height: 7px; border-radius: 50%; background: var(--green); box-shadow: 0 0 0 4px color-mix(in srgb, var(--green) 13%, transparent); }
.site-name { margin: 14px 0 0; color: var(--muted); text-align: center; font-size: 11px; letter-spacing: .08em; }

@media (max-width: 850px) {
  .login-layout { width: min(100% - 32px, 500px); display: block; padding: 70px 0 32px; }
  .brand-panel { padding: 10px 4px 30px; text-align: center; }
  .brand-mark { margin: auto; }
  .eyebrow { margin-top: 18px; }
  h1 { font-size: 48px; }
  .subtitle { margin: 12px 0 22px; font-size: 17px; }
  .market-strip { display: none; }
  .trend-line { height: 74px; margin: 0 12px 18px; }
  .login-card { padding: 30px 24px; border-radius: 20px; }
}

@media (max-width: 420px) {
  .theme-button { top: 14px; right: 14px; }
  .login-layout { width: calc(100% - 24px); }
  .brand-panel { padding-bottom: 18px; }
  .trend-line { display: none; }
  .login-card { padding: 26px 20px; }
}