:root {
  --night: #0c2428;
  --teal: #156b5c;
  --panel: #f4f8f6;
  --ink: #12302c;
  --muted: #5d726c;
  --line: #c5d5ce;
  --warn: #c4473a;
  --tap: 48px;
}
* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; }
body.login-page {
  min-height: 100vh;
  min-height: 100dvh;
  font-family: "IBM Plex Sans", "Noto Sans SC", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(900px 360px at 50% -8%, rgba(21,107,92,.14), transparent 60%),
    var(--panel);
  padding: env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left);
}
.login-shell {
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px 16px 112px;
  position: relative;
  z-index: 2;
}
.login-main {
  width: min(400px, 100%);
  text-align: center;
}
.login-orbit {
  position: fixed;
  left: 50%;
  bottom: max(4px, env(safe-area-inset-bottom));
  transform: translateX(-50%);
  width: min(360px, 88vw);
  height: min(360px, 88vw);
  z-index: 1;
  pointer-events: none;
}
.login-orbit-ring {
  position: absolute;
  inset: 14%;
  border: 1px dashed rgba(21, 107, 92, .16);
  border-radius: 50%;
}
.login-orbit-item {
  --rs: 1;
  position: absolute;
  left: 50%;
  top: 50%;
  margin: 0;
  color: var(--teal);
  opacity: .48;
  user-select: none;
  will-change: transform;
  animation: login-orbit-run var(--dur, 22s) cubic-bezier(.45,.02,.28,1) infinite;
}
.login-orbit-rev { animation-direction: reverse; }
.login-orbit-back { animation-direction: alternate; }
.login-orbit-rev.login-orbit-back { animation-direction: alternate-reverse; }
.login-chip-zi {
  font-family: "ZCOOL XiaoWei", "Noto Sans SC", serif;
  font-size: clamp(26px, 6vw, 36px);
  line-height: 1;
  letter-spacing: .08em;
}
.login-chip-ico {
  width: 22px;
  height: 22px;
  display: block;
  opacity: .38;
}
.login-chip-ico svg {
  width: 100%;
  height: 100%;
  display: block;
}
.login-chip-ico[data-k="video"] { color: #156b5c; }
.login-chip-ico[data-k="exam"] { color: #1a4d6b; }
.login-chip-ico[data-k="attach"] { color: #5a6b15; }
.login-chip-ico[data-k="practice"] { color: #6b3a15; }
@keyframes login-orbit-run {
  0% {
    transform: rotate(var(--a)) translateY(calc(-1 * var(--r) * var(--rs))) rotate(calc(var(--a) * -1));
  }
  16% {
    transform: rotate(calc(var(--a) + 38deg)) translateY(calc(-1 * var(--r) * var(--rs) * 1.1)) rotate(calc((var(--a) + 38deg) * -1));
  }
  41% {
    transform: rotate(calc(var(--a) + 168deg)) translateY(calc(-1 * var(--r) * var(--rs) * .86)) rotate(calc((var(--a) + 168deg) * -1));
  }
  67% {
    transform: rotate(calc(var(--a) + 238deg)) translateY(calc(-1 * var(--r) * var(--rs) * 1.08)) rotate(calc((var(--a) + 238deg) * -1));
  }
  86% {
    transform: rotate(calc(var(--a) + 328deg)) translateY(calc(-1 * var(--r) * var(--rs) * .92)) rotate(calc((var(--a) + 328deg) * -1));
  }
  100% {
    transform: rotate(calc(var(--a) + 360deg)) translateY(calc(-1 * var(--r) * var(--rs))) rotate(calc((var(--a) + 360deg) * -1));
  }
}
.login-kicker {
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--teal);
}
.login-head h1 {
  font-family: "ZCOOL XiaoWei", "Noto Sans SC", serif;
  font-size: clamp(32px, 8vw, 42px);
  font-weight: 400;
  margin: 8px 0 8px;
  letter-spacing: .08em;
}
.login-sub {
  margin: 0 0 20px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.6;
}
.login-card {
  text-align: left;
  background: #fff;
  border: 1px solid var(--line);
  padding: 16px 16px 14px;
  border-radius: 12px;
  box-shadow: 0 16px 36px rgba(12,36,40,.08);
}
.login-tabs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  margin-bottom: 12px;
  border-bottom: 1px solid var(--line);
}
.login-tabs button {
  appearance: none;
  border: 0;
  background: transparent;
  min-height: 44px;
  color: var(--muted);
  font: inherit;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
}
.login-tabs button.on {
  color: var(--ink);
  border-bottom-color: var(--teal);
  font-weight: 600;
}
.login-card label {
  display: block;
  font-size: 12px;
  color: var(--muted);
  margin: 10px 0 4px;
}
.login-card input {
  width: 100%;
  min-height: var(--tap);
  padding: 10px 12px;
  border: 1px solid var(--line);
  background: var(--panel);
  font: inherit;
  border-radius: 8px;
  font-size: 16px;
}
.login-card input:focus {
  outline: 2px solid var(--teal);
  outline-offset: 1px;
  background: #fff;
}
.err { display: none !important; }
.modal {
  position: fixed; inset: 0; background: rgba(12,36,40,.45);
  display: flex; align-items: flex-end; justify-content: center;
  z-index: 40; padding: 0;
}
.modal[hidden] { display: none; }
.modal-card {
  width: 100%;
  background: #fff;
  border-top: 2px solid var(--night);
  padding: 16px 16px calc(16px + env(safe-area-inset-bottom));
  border-radius: 14px 14px 0 0;
  text-align: left;
}
.modal-card h2 { margin: 0 0 8px; font-size: 18px; }
.modal-card .modal-body { white-space: pre-wrap; font-size: 14px; line-height: 1.55; }
.modal-card .btns { display: flex; gap: 8px; margin-top: 12px; }
.modal-card button {
  appearance: none; flex: 1; min-height: 44px;
  border: 1px solid var(--night); background: var(--night);
  color: #e8f6f1; font: inherit; border-radius: 8px; cursor: pointer;
}
.modal-card button.ghost { background: transparent; color: var(--ink); }
@media (min-width: 721px) {
  .modal { align-items: center; padding: 18px; }
  .modal-card { width: min(420px, 100%); border: 1px solid var(--night); border-radius: 8px; }
}
.login-go {
  appearance: none;
  width: 100%;
  margin-top: 10px;
  min-height: var(--tap);
  border: 0;
  border-radius: 8px;
  background: var(--night);
  color: #e8f6f1;
  font: inherit;
  font-weight: 600;
  letter-spacing: .08em;
  cursor: pointer;
}
.login-go:active { transform: translateY(1px); }
.login-note {
  color: var(--muted);
  font-size: 12px;
  line-height: 1.55;
  margin: 12px 0 0;
  text-align: center;
}
@media (max-width: 420px) {
  .login-shell { padding: 16px 14px 88px; align-items: flex-start; padding-top: 12vh; }
  .login-card { box-shadow: none; }
  .login-orbit { width: min(280px, 86vw); height: min(280px, 86vw); }
  .login-orbit-item { --rs: .74; }
  .login-chip-ico { width: 18px; height: 18px; }
}
@media (prefers-reduced-motion: reduce) {
  .login-go:active { transform: none; }
  .login-orbit-item {
    animation: none !important;
    transform: rotate(var(--a)) translateY(calc(-1 * var(--r) * var(--rs))) rotate(calc(var(--a) * -1));
  }
}