/* 青玉智枢 · 登录 / 注册 */
:root {
  --crimson: #a5121e;
  --crimson-deep: #7d0b15;
  --crimson-wash: #f8eeed;
  --ink: #17130f;
  --ink-70: #4b423b;
  --ink-50: #7a716a;
  --ink-30: #a9a099;
  --paper: #fbf8f2;
  --white: #fffdfa;
  --line: rgba(23, 19, 15, .12);
  --serif: "Noto Serif SC", "Noto Serif CJK SC", "Songti SC", serif;
  --sans: "Noto Serif SC", "Noto Serif CJK SC", "Songti SC", serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--sans);
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  display: grid;
  grid-template-columns: 1.05fr 1fr;
}

a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; }
::selection { background: rgba(165, 18, 30, .16); }

/* 左侧品牌面 */
.aside {
  position: relative;
  background: var(--crimson-deep);
  color: #fff;
  padding: 46px 56px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.aside::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, .055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, .055) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse at 20% 80%, #000, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse at 20% 80%, #000, transparent 75%);
}

.aside::after {
  content: "";
  position: absolute;
  right: -140px;
  bottom: -160px;
  width: 460px;
  height: 460px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 255, 255, .12), transparent 62%);
}

.aside > * { position: relative; z-index: 1; }

.brand { display: inline-flex; align-items: center; gap: 12px; }

.brand img {
  width: 40px;
  height: 40px;
  border-radius: 9px;
  background: #fff;
  padding: 3px;
}

.brand strong {
  display: block;
  font-family: var(--serif);
  font-size: 21px;
  letter-spacing: .1em;
  line-height: 1.2;
}

.brand small {
  display: block;
  font-size: 8.5px;
  letter-spacing: .34em;
  color: rgba(255, 255, 255, .55);
  margin-top: 4px;
  text-transform: uppercase;
}

.aside-mid { margin-top: auto; margin-bottom: auto; padding: 60px 0; }

.aside h1 {
  font-family: var(--serif);
  font-size: clamp(30px, 3vw, 44px);
  line-height: 1.28;
  letter-spacing: -.02em;
  margin: 0 0 22px;
  max-width: 440px;
}

.aside h1 em {
  font-style: normal;
  color: #f0c9c6;
}

.aside p {
  margin: 0;
  font-size: 14px;
  line-height: 1.9;
  color: rgba(255, 255, 255, .68);
  max-width: 400px;
}

.aside-list {
  list-style: none;
  padding: 0;
  margin: 34px 0 0;
  display: flex;
  flex-direction: column;
  gap: 14px;
  max-width: 400px;
}

.aside-list li {
  display: flex;
  gap: 11px;
  font-size: 13px;
  color: rgba(255, 255, 255, .8);
  line-height: 1.6;
}

.aside-list svg { flex: none; margin-top: 3px; color: #e8b3b0; }

.aside-foot {
  display: flex;
  align-items: center;
  gap: 18px;
  font-size: 11.5px;
  color: rgba(255, 255, 255, .45);
}

.aside-foot a:hover { color: #fff; }

/* 右侧表单 */
.panel {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 48px 32px;
  position: relative;
}

.panel-inner { width: 100%; max-width: 372px; }
.panel-brand { display: none; }

.panel h2 {
  font-family: var(--serif);
  font-size: 27px;
  margin: 0;
  letter-spacing: -.01em;
}

.panel .sub {
  margin: 8px 0 28px;
  font-size: 13.5px;
  color: var(--ink-50);
}

.tabs {
  display: flex;
  gap: 4px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 24px;
}

.tabs button {
  border: 0;
  background: none;
  padding: 10px 2px;
  margin-right: 22px;
  font-size: 14px;
  color: var(--ink-50);
  position: relative;
}

.tabs button.on { color: var(--ink); font-weight: 500; }

.tabs button.on::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: var(--crimson);
}

.field { margin-bottom: 14px; }

.field label {
  display: block;
  font-size: 12px;
  color: var(--ink-50);
  margin-bottom: 7px;
  letter-spacing: .02em;
}

.input {
  width: 100%;
  height: 44px;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: var(--white);
  padding: 0 13px;
  font-size: 14px;
  font-family: inherit;
  color: var(--ink);
  outline: none;
  transition: border-color .2s, box-shadow .2s;
}

.input::placeholder { color: var(--ink-30); }

.input:focus {
  border-color: rgba(165, 18, 30, .45);
  box-shadow: 0 0 0 3px rgba(165, 18, 30, .07);
}

.code-row { display: flex; gap: 8px; }
.code-row .input { flex: 1; }

.code-btn {
  flex: none;
  width: 108px;
  height: 44px;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: transparent;
  font-size: 12.5px;
  color: var(--ink-70);
  transition: color .2s, border-color .2s;
}

.code-btn:hover:not(:disabled) { color: var(--crimson); border-color: rgba(165, 18, 30, .35); }
.code-btn:disabled { color: var(--ink-30); cursor: default; }

.agree {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  font-size: 11.5px;
  color: var(--ink-50);
  line-height: 1.6;
  margin: 6px 0 18px;
}

.agree input { margin: 2px 0 0; accent-color: var(--crimson); }
.agree a { color: var(--crimson); }

.submit {
  width: 100%;
  height: 46px;
  border: 0;
  border-radius: 10px;
  background: var(--crimson);
  color: #fff;
  font-size: 15px;
  letter-spacing: .02em;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  box-shadow: 0 10px 24px -14px rgba(165, 18, 30, .9);
  transition: background .2s, transform .2s;
}

.submit:hover { background: var(--crimson-deep); transform: translateY(-1px); }
.submit:disabled { opacity: .75; transform: none; }

.spinner {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  border: 1.5px solid rgba(255, 255, 255, .4);
  border-top-color: #fff;
  animation: spin .7s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

.divider {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 24px 0 18px;
  font-size: 11px;
  color: var(--ink-30);
  letter-spacing: .06em;
}

.divider::before, .divider::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--line);
}

.socials { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; }

.socials button {
  height: 42px;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: var(--white);
  font-size: 12.5px;
  color: var(--ink-70);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  transition: border-color .2s, color .2s, background .2s;
}

.socials button:hover { border-color: rgba(165, 18, 30, .3); color: var(--crimson); background: var(--crimson-wash); }

.legal {
  margin-top: 26px;
  font-size: 11px;
  color: var(--ink-30);
  line-height: 1.7;
}

.demo-tip {
  margin-top: 16px;
  font-size: 11.5px;
  color: var(--jade, #2b6b5c);
  background: #edf3f0;
  border: 1px solid rgba(43, 107, 92, .14);
  border-radius: 8px;
  padding: 8px 11px;
  line-height: 1.6;
}

.toast {
  position: fixed;
  left: 50%;
  bottom: 28px;
  transform: translate(-50%, 10px);
  background: var(--ink);
  color: #fff;
  font-size: 12.5px;
  padding: 9px 16px;
  border-radius: 8px;
  opacity: 0;
  pointer-events: none;
  transition: opacity .25s, transform .25s;
}

.toast.on { opacity: 1; transform: translate(-50%, 0); }

@media (max-width: 900px) {
  body { grid-template-columns: 1fr; }
  .aside { display: none; }
  .panel { min-height: 100vh; padding: 40px 22px; align-items: flex-start; }
  .panel-inner { padding-top: 52px; }
  .panel-brand {
    display: inline-flex;
    align-items: center;
    gap: 9px;
    position: absolute;
    top: 24px;
    left: 22px;
    font-family: var(--serif);
    font-size: 16px;
    letter-spacing: .1em;
  }
  .panel-brand img { width: 26px; height: 26px; border-radius: 6px; }
}

.form-err {
  color: var(--err);
  font-size: 12.5px;
  min-height: 18px;
  margin: 10px 0 0;
  text-align: left;
}