:root {
  --login-page: #03090e;
  --login-bg: #071016;
  --login-bg-cool: #08141a;
  --login-surface: #0d171d;
  --login-surface-2: #142128;
  --login-surface-hover: #18272e;
  --login-ink: #e8eff0;
  --login-ink-2: #c4d0d1;
  --login-muted: #94a4a7;
  --login-dim: #758589;
  --login-line: rgba(196, 218, 219, .13);
  --login-line-strong: rgba(196, 218, 219, .26);
  --login-accent: #8fc8c7;
  --login-accent-bright: #b5e3e1;
  --login-accent-ink: #071315;
  --login-accent-soft: rgba(143, 200, 199, .12);
  --login-error: #ef9d98;
  --login-error-soft: rgba(187, 73, 65, .12);
  --login-error-line: rgba(239, 157, 152, .3);
  --login-radius: 16px;
  --login-radius-sm: 11px;
  --login-ease: cubic-bezier(.22, 1, .36, 1);
  --login-display: "Avenir Next", "SF Pro Display", "PingFang SC", "Noto Sans CJK SC", sans-serif;
  --login-text: "Avenir Next", "SF Pro Text", "PingFang SC", "Noto Sans CJK SC", "Microsoft YaHei", sans-serif;
  --login-mono: "SFMono-Regular", "JetBrains Mono", "Roboto Mono", monospace;
}

* { box-sizing: border-box; }
html { min-width: 320px; background: var(--login-page); }
body.login-page {
  min-height: 100dvh;
  margin: 0;
  overflow-x: hidden;
  display: grid;
  grid-template-rows: auto 1fr auto;
  background:
    radial-gradient(circle at 24% 42%, var(--login-accent-soft), transparent 29%),
    linear-gradient(115deg, var(--login-page) 0%, var(--login-bg) 58%, var(--login-bg-cool) 100%);
  color: var(--login-ink);
  font-family: var(--login-text);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: geometricPrecision;
}

.login-page a { color: inherit; text-decoration: none; }
.login-page button, .login-page input { font: inherit; }
.login-page svg { display: block; }
.login-page :focus-visible { outline: 2px solid var(--login-accent); outline-offset: 3px; }
.icon-sprite { position: absolute; width: 0; height: 0; overflow: hidden; }

.skip-link {
  position: fixed;
  z-index: 30;
  left: 18px;
  top: -80px;
  padding: 10px 16px;
  border-radius: 999px;
  background: var(--login-ink);
  color: var(--login-page) !important;
  transition: top .18s ease;
}
.skip-link:focus { top: 18px; }

.login-header {
  width: 100%;
  min-height: 82px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px clamp(22px, 4.4vw, 72px);
  border-bottom: 1px solid var(--login-line);
}

.brand-signature {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  font-family: var(--login-display);
  font-size: 22px;
  font-weight: 620;
  letter-spacing: -.035em;
}

.brand-symbol {
  position: relative;
  display: inline-block;
  width: 22px;
  height: 22px;
  flex: 0 0 auto;
}
.brand-symbol::before, .brand-symbol::after {
  content: "";
  position: absolute;
  inset: 50% auto auto 50%;
  border: 1px solid var(--login-accent);
  transform: translate(-50%, -50%) rotate(45deg);
}
.brand-symbol::before { width: 15px; height: 15px; }
.brand-symbol::after {
  width: 4px;
  height: 4px;
  background: var(--login-accent);
  box-shadow: 0 0 18px rgba(143, 200, 199, .55);
}

.back-home {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 14px;
  border: 1px solid transparent;
  border-radius: 999px;
  color: var(--login-muted);
  font-size: 13px;
  transition: color .2s ease, border-color .2s ease, background .2s ease;
}
.back-home svg { width: 17px; height: 17px; transition: transform .28s var(--login-ease); }
.back-home:hover { color: var(--login-ink); border-color: var(--login-line); background: rgba(255, 255, 255, .02); }
.back-home:hover svg { transform: translateX(3px); }

.login-shell {
  width: min(100%, 1500px);
  min-height: 680px;
  margin-inline: auto;
  padding: clamp(44px, 6vh, 76px) clamp(22px, 4.4vw, 72px);
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(390px, 480px);
  gap: clamp(60px, 8vw, 142px);
  align-items: center;
}

.login-intro { position: relative; min-width: 0; align-self: stretch; display: flex; flex-direction: column; justify-content: center; }
.system-status { display: flex; align-items: center; gap: 12px; margin-bottom: 28px; }
.system-status > span {
  width: 7px;
  height: 7px;
  flex: 0 0 auto;
  border-radius: 50%;
  background: var(--login-accent-bright);
  box-shadow: 0 0 0 5px rgba(143, 200, 199, .07), 0 0 22px rgba(143, 200, 199, .55);
}
.system-status p {
  margin: 0;
  color: var(--login-ink-2);
  font: 520 10px/1.25 var(--login-mono);
  letter-spacing: .15em;
}

.login-intro h1 {
  max-width: 720px;
  margin: 0;
  font-family: var(--login-display);
  font-size: clamp(50px, 5vw, 78px);
  font-weight: 560;
  line-height: .98;
  letter-spacing: -.04em;
  text-wrap: balance;
}
.intro-copy {
  max-width: 600px;
  margin: 30px 0 0;
  color: var(--login-muted);
  font-size: 17px;
  line-height: 1.78;
  text-wrap: pretty;
}

.operating-orbit {
  position: relative;
  width: min(620px, 92%);
  height: 210px;
  margin-top: 46px;
  overflow: hidden;
  border-top: 1px solid var(--login-line);
}
.orbit-ring, .orbit-axis, .orbit-core, .orbit-node { position: absolute; }
.orbit-ring {
  left: 52%;
  top: 112px;
  border: 1px solid rgba(143, 200, 199, .14);
  border-radius: 50%;
  transform: translate(-50%, -50%) rotate(-5deg);
}
.orbit-ring-outer { width: 560px; height: 176px; }
.orbit-ring-inner { width: 360px; height: 112px; transform: translate(-50%, -50%) rotate(8deg); }
.orbit-axis {
  left: 2%;
  right: 2%;
  top: 112px;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(143, 200, 199, .4), transparent);
}
.orbit-core {
  left: 52%;
  top: 112px;
  width: 64px;
  height: 64px;
  border: 1px solid var(--login-line-strong);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  background: radial-gradient(circle, rgba(181, 227, 225, .16), rgba(13, 23, 29, .7) 60%, transparent 62%);
}
.orbit-core i {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 8px;
  height: 8px;
  background: var(--login-accent-bright);
  transform: translate(-50%, -50%) rotate(45deg);
  box-shadow: 0 0 22px rgba(143, 200, 199, .5);
}
.orbit-node {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--login-dim);
  font-size: 11px;
  white-space: nowrap;
}
.orbit-node i { width: 6px; height: 6px; border: 1px solid var(--login-accent); border-radius: 50%; }
.node-signal { left: 1%; top: 82px; }
.node-decision { left: 25%; top: 146px; }
.node-action { right: 22%; top: 62px; }
.node-feedback { right: 1%; top: 132px; }

.login-panel {
  width: 100%;
  padding: clamp(30px, 3vw, 42px);
  border: 1px solid var(--login-line-strong);
  border-radius: var(--login-radius);
  background: var(--login-surface);
  box-shadow: inset 0 1px rgba(255, 255, 255, .025);
}
.panel-heading { display: flex; align-items: flex-start; gap: 18px; margin-bottom: 34px; }
.panel-symbol { width: 24px; height: 24px; margin-top: 4px; }
.panel-heading h2 {
  margin: 0;
  font-family: var(--login-display);
  font-size: 28px;
  font-weight: 580;
  line-height: 1.2;
  letter-spacing: -.03em;
  text-wrap: balance;
}
.panel-heading p { margin: 8px 0 0; color: var(--login-muted); font-size: 13px; line-height: 1.6; }

.login-alert {
  display: grid;
  grid-template-columns: 20px 1fr;
  gap: 12px;
  margin: -8px 0 24px;
  padding: 13px 14px;
  border: 1px solid var(--login-error-line);
  border-radius: var(--login-radius-sm);
  background: var(--login-error-soft);
  color: var(--login-error);
}
.login-alert svg { width: 19px; height: 19px; margin-top: 2px; }
.login-alert strong { display: block; font-size: 13px; font-weight: 620; }
.login-alert p { margin: 3px 0 0; color: var(--login-ink-2); font-size: 12px; line-height: 1.55; }

.login-form { display: grid; gap: 22px; }
.field-group { display: grid; gap: 8px; }
.field-group label { color: var(--login-ink-2); font-size: 13px; font-weight: 560; }
.field-group input {
  width: 100%;
  min-height: 52px;
  padding: 12px 14px;
  border: 1px solid var(--login-line);
  border-radius: var(--login-radius-sm);
  outline: 0;
  background: var(--login-surface-2);
  color: var(--login-ink);
  caret-color: var(--login-accent-bright);
  font-size: 15px;
  transition: background .18s ease, border-color .18s ease, box-shadow .18s ease;
}
.field-group input::placeholder { color: var(--login-muted); opacity: 1; }
.field-group input:hover { background: var(--login-surface-hover); border-color: var(--login-line-strong); }
.field-group input:focus { border-color: var(--login-accent); box-shadow: 0 0 0 3px var(--login-accent-soft); }
.password-field { position: relative; }
.password-field input { padding-right: 54px; }
.password-toggle {
  position: absolute;
  right: 5px;
  top: 50%;
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  padding: 0;
  border: 0;
  border-radius: 9px;
  background: transparent;
  color: var(--login-muted);
  cursor: pointer;
  transition: color .18s ease, background .18s ease;
  transform: translateY(-50%);
}
.password-toggle:hover { color: var(--login-ink); background: rgba(255, 255, 255, .035); }
.password-toggle svg { width: 19px; height: 19px; }
.password-toggle .eye-off { display: none; }
.password-toggle[aria-pressed="true"] .eye-on { display: none; }
.password-toggle[aria-pressed="true"] .eye-off { display: block; }

.login-submit {
  width: 100%;
  min-height: 52px;
  margin-top: 4px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 17px 12px 19px;
  border: 1px solid var(--login-accent);
  border-radius: var(--login-radius-sm);
  background: var(--login-accent);
  color: var(--login-accent-ink);
  font-size: 14px;
  font-weight: 650;
  cursor: pointer;
  transition: background .2s ease, border-color .2s ease, transform .2s var(--login-ease);
}
.login-submit svg { width: 19px; height: 19px; transition: transform .28s var(--login-ease); }
.login-submit:hover { background: var(--login-accent-bright); border-color: var(--login-accent-bright); transform: translateY(-1px); }
.login-submit:hover svg { transform: translateX(3px); }
.login-submit:active { transform: translateY(0); }
.login-submit:disabled { cursor: wait; opacity: .7; transform: none; }
.submit-loading { display: none; }
.login-form.is-submitting .submit-label { display: none; }
.login-form.is-submitting .submit-loading { display: inline; }
.login-form.is-submitting .login-submit svg { animation: submitPulse .9s ease-in-out infinite alternate; }

.access-note { display: flex; align-items: center; gap: 9px; margin: 24px 0 0; color: var(--login-dim); font-size: 11px; }
.access-note span { width: 5px; height: 5px; border-radius: 50%; background: var(--login-accent); box-shadow: 0 0 10px rgba(143, 200, 199, .35); }

.login-footer {
  min-height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 16px clamp(22px, 4.4vw, 72px);
  border-top: 1px solid var(--login-line);
  color: var(--login-dim);
  font-size: 11px;
}

@keyframes submitPulse { to { transform: translateX(3px); } }

@media (max-width: 1040px) {
  .login-shell { grid-template-columns: minmax(0, 1fr) minmax(370px, 440px); gap: 52px; }
  .login-intro h1 { font-size: 52px; }
  .operating-orbit { width: 100%; }
}

@media (max-width: 820px) {
  body.login-page { background: linear-gradient(160deg, var(--login-page), var(--login-bg)); }
  .login-header { min-height: 72px; }
  .login-shell {
    min-height: auto;
    grid-template-columns: 1fr;
    gap: 34px;
    padding-top: 38px;
    padding-bottom: 54px;
  }
  .login-intro { display: block; }
  .system-status { margin-bottom: 18px; }
  .login-intro h1 { max-width: 600px; font-size: clamp(38px, 9vw, 54px); line-height: 1.02; }
  .intro-copy { max-width: 580px; margin-top: 20px; font-size: 15px; }
  .operating-orbit { display: none; }
  .login-panel { max-width: 580px; }
}

@media (max-width: 520px) {
  .login-header { padding-inline: 18px; }
  .brand-signature { font-size: 20px; }
  .back-home { padding-inline: 10px; }
  .login-shell { padding: 30px 18px 42px; gap: 28px; }
  .system-status p { max-width: 270px; font-size: 8px; letter-spacing: .12em; }
  .login-intro h1 { font-size: 36px; }
  .intro-copy { font-size: 14px; line-height: 1.72; }
  .login-panel { padding: 26px 20px; }
  .panel-heading { gap: 14px; margin-bottom: 28px; }
  .panel-heading h2 { font-size: 25px; }
  .login-footer { align-items: flex-start; flex-direction: column; gap: 4px; padding-inline: 18px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    scroll-behavior: auto !important;
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
}