:root {
  color-scheme: dark;
  font-family: Inter, "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  --bg: #0b1020;
  --panel: rgba(18, 27, 49, 0.88);
  --line: rgba(255, 255, 255, 0.13);
  --text: #edf3ff;
  --muted: #9caad1;
  --cyan: #38d5ff;
  --gold: #ffd166;
  --red: #ff6b6b;
}

* {
  box-sizing: border-box;
}

html,
body {
  min-height: 100%;
  margin: 0;
}

body {
  background:
    radial-gradient(circle at 20% 20%, rgba(56, 213, 255, 0.18), transparent 28rem),
    radial-gradient(circle at 80% 35%, rgba(255, 209, 102, 0.1), transparent 24rem),
    linear-gradient(135deg, #07111d, #17162b 50%, #0d1b24);
  color: var(--text);
}

.login-body {
  overflow: hidden;
}

.login-shell {
  display: grid;
  min-height: 100vh;
  place-items: center;
  padding: 24px;
  position: relative;
}

.login-shell::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
  background-size: 54px 54px;
  mask-image: linear-gradient(to bottom, transparent, #000 25%, #000 70%, transparent);
}

.login-panel {
  width: min(100%, 390px);
  padding: 34px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.36);
  position: relative;
}

.brand-mark {
  width: 56px;
  height: 56px;
  border: 2px solid rgba(56, 213, 255, 0.55);
  border-radius: 50%;
  background:
    conic-gradient(from 90deg, transparent, rgba(56, 213, 255, 0.8), transparent 48%),
    radial-gradient(circle, var(--gold) 0 5px, transparent 6px);
  box-shadow: 0 0 32px rgba(56, 213, 255, 0.3);
}

.login-panel h1 {
  margin: 18px 0 26px;
  font-size: 34px;
  line-height: 1.1;
  letter-spacing: 0;
}

.login-form {
  display: grid;
  gap: 16px;
}

.login-form label {
  display: grid;
  gap: 8px;
}

.login-form span,
.game-hud span {
  color: var(--muted);
  font-size: 13px;
}

.login-form input {
  width: 100%;
  height: 46px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: rgba(8, 13, 26, 0.78);
  color: var(--text);
  font: inherit;
  outline: none;
  padding: 0 13px;
}

.login-form input:focus {
  border-color: var(--cyan);
  box-shadow: 0 0 0 3px rgba(56, 213, 255, 0.14);
}

.login-form button,
.game-hud button {
  height: 46px;
  border: 0;
  border-radius: 6px;
  background: linear-gradient(135deg, var(--cyan), #7cffb2);
  color: #06111c;
  cursor: pointer;
  font: 700 15px/1 Inter, "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
}

.form-error {
  margin: 0;
  color: var(--red);
  font-size: 14px;
}

.game-body {
  min-height: 100vh;
  overflow-x: hidden;
}

.game-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
  padding: 0 28px;
  border-bottom: 1px solid var(--line);
  background: rgba(7, 12, 24, 0.78);
  backdrop-filter: blur(18px);
}

.game-topbar div {
  display: flex;
  align-items: baseline;
  gap: 14px;
}

.game-topbar strong {
  font-size: 19px;
}

.game-topbar span,
.game-topbar a {
  color: var(--muted);
  text-decoration: none;
}

.game-layout {
  display: grid;
  width: 100%;
  height: calc(100vh - 64px);
  margin: 0;
}

.game-frame {
  display: block;
  width: 100%;
  height: 100%;
  border: 0;
  background: #050914;
}

@media (max-width: 800px) {
  .game-topbar {
    padding: 0 18px;
  }

  .game-layout {
    height: calc(100vh - 64px);
  }
}

@media (max-width: 520px) {
  .login-panel {
    padding: 26px;
  }

  .login-panel h1 {
    font-size: 28px;
  }

}