:root {
  --auth-ink: #192720;
  --auth-muted: #65736c;
  --auth-line: #d9e1dd;
  --auth-paper: #f3f6f4;
  --auth-panel: #ffffff;
  --auth-green: #137563;
  --auth-green-dark: #15352d;
  --auth-orange: #df713b;
  --auth-danger: #ae2943;
}

* { box-sizing: border-box; }
html { background: var(--auth-paper); -webkit-tap-highlight-color: transparent; }
body { margin: 0; color: var(--auth-ink); font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif; letter-spacing: 0; }
button, input, select { font: inherit; letter-spacing: 0; }
a { color: inherit; }

.register-page { min-height: 100vh; min-height: 100dvh; background: var(--auth-paper); }
.register-topbar { display: flex; min-height: 70px; align-items: center; justify-content: space-between; padding: 0 clamp(26px,5vw,74px); border-bottom: 1px solid var(--auth-line); background: #fff; }
.register-brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; }
.register-brand > span { display: grid; width: 36px; height: 36px; place-items: center; border-radius: 5px; background: var(--auth-green); color: #fff; font-weight: 800; }
.register-brand strong { font-family: SimSun, "Songti SC", serif; font-size: 18px; }
.register-login-link { display: inline-flex; min-height: 44px; align-items: center; color: var(--auth-green); font-size: 13px; font-weight: 750; text-decoration: none; }
.register-desktop-main { display: grid; width: min(1160px,calc(100% - 48px)); grid-template-columns: minmax(300px,.72fr) minmax(540px,1.28fr); align-items: start; gap: 0; margin: 42px auto 64px; border: 1px solid var(--auth-line); border-radius: 7px; background: #fff; overflow: hidden; box-shadow: 0 18px 48px rgba(25,53,45,.08); }
.register-context { align-self: stretch; padding: 48px 40px; background: var(--auth-green-dark); color: #fff; }
.register-context > p { margin: 0 0 15px; color: #78c8b5; font-size: 10px; font-weight: 850; }
.register-context h1 { margin: 0; font-family: SimSun, "Songti SC", serif; font-size: 34px; line-height: 1.25; }
.register-context > span { display: block; margin-top: 18px; color: #c4d8d1; font-size: 14px; line-height: 1.8; }
.register-context dl { display: grid; gap: 0; margin: 42px 0 0; }
.register-context dl div { padding: 15px 0; border-top: 1px solid rgba(255,255,255,.14); }
.register-context dt { color: #7fc8b8; font-size: 10px; font-weight: 800; }.register-context dd { margin: 5px 0 0; font-size: 12px; font-weight: 700; }
.register-panel { min-width: 0; padding: 34px 38px 38px; }
.register-error { margin-bottom: 18px; padding: 11px 13px; border: 1px solid #edbdc7; border-radius: 5px; background: #fff1f4; color: var(--auth-danger); font-size: 12px; }
.register-form fieldset { margin: 0 0 26px; padding: 0; border: 0; }
.register-form legend { width: 100%; margin-bottom: 16px; padding-bottom: 10px; border-bottom: 1px solid var(--auth-line); font-size: 14px; font-weight: 800; }
.register-form-grid { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 17px; }
.register-field { display: grid; align-content: start; gap: 7px; min-width: 0; color: #34443c; font-size: 12px; font-weight: 700; }
.register-field-wide { grid-column: 1 / -1; }
.register-field span b { color: var(--auth-danger); }
.register-field input, .register-field select { width: 100%; min-height: 46px; padding: 0 12px; border: 1px solid #cbd5d0; border-radius: 5px; background: #fbfcfb; color: var(--auth-ink); font-size: 16px; }
.register-field input:focus, .register-field select:focus { border-color: var(--auth-green); outline: 2px solid #cce9e1; }
.register-field small { min-height: 15px; color: #7b8882; font-size: 10px; font-weight: 400; line-height: 1.5; }
.register-field small.match-error { color: var(--auth-danger); }
.register-field small.match-success { color: var(--auth-green); }
.register-password-toggle { display: inline-flex; min-height: 44px; align-items: center; gap: 9px; width: fit-content; color: var(--auth-muted); font-size: 12px; cursor: pointer; }
.register-password-toggle input { width: 18px; height: 18px; accent-color: var(--auth-green); }
.register-semester-note { display: flex; min-height: 48px; align-items: center; gap: 10px; margin-top: -5px; padding: 0 12px; border-left: 3px solid var(--auth-orange); background: #f8faf9; }
.register-semester-note span, .register-semester-note small { color: var(--auth-muted); font-size: 10px; }.register-semester-note strong { font-size: 12px; }.register-semester-note small { margin-left: auto; }
.register-submit { width: 100%; min-height: 48px; margin-top: 20px; border: 0; border-radius: 5px; background: var(--auth-orange); color: #fff; font-size: 14px; font-weight: 800; cursor: pointer; }
.register-submit:hover { background: #c95d29; }
.register-submit:disabled { background: #aeb8b3; cursor: not-allowed; }
.registration-paused { overflow: hidden; }
.registration-pause-overlay { position: fixed; inset: 0; z-index: 100; display: grid; place-items: center; padding: 20px; background: rgba(20,35,29,.64); }
.registration-pause-dialog { width: min(430px,100%); padding: 28px; border: 1px solid #cbd5d0; border-radius: 7px; background: #fff; box-shadow: 0 24px 70px rgba(14,31,24,.28); text-align: center; }
.registration-pause-mark { display: grid; width: 46px; height: 46px; margin: 0 auto 16px; place-items: center; border-radius: 50%; background: #fff0e8; color: #b84d1d; font-size: 25px; font-weight: 900; }
.registration-pause-dialog h2 { margin: 0; font-size: 22px; letter-spacing: 0; }
.registration-pause-dialog p { margin: 12px 0 22px; color: var(--auth-muted); font-size: 14px; line-height: 1.7; overflow-wrap: anywhere; white-space: pre-wrap; }
.registration-pause-dialog a { display: inline-flex; min-height: 46px; align-items: center; justify-content: center; padding: 0 20px; border-radius: 5px; background: var(--auth-green); color: #fff; font-size: 13px; font-weight: 800; text-decoration: none; }

.register-mobile { padding-bottom: env(safe-area-inset-bottom); background: #fff; }
.register-mobile-topbar { position: sticky; top: 0; z-index: 10; display: grid; min-height: 58px; grid-template-columns: 44px 1fr 44px; align-items: center; padding: max(0px,env(safe-area-inset-top)) 10px 0; border-bottom: 1px solid var(--auth-line); background: rgba(255,255,255,.97); }
.register-mobile-topbar strong { text-align: center; font-size: 15px; }
.register-mobile-topbar a { display: grid; min-width: 44px; min-height: 44px; place-items: center; color: var(--auth-green); font-size: 13px; font-weight: 750; text-decoration: none; }
.register-mobile-back { font-size: 20px !important; }
.register-mobile-main { padding: 26px max(18px,env(safe-area-inset-right)) max(40px,env(safe-area-inset-bottom)) max(18px,env(safe-area-inset-left)); }
.register-mobile-heading { margin-bottom: 28px; }
.register-mobile-heading span { color: var(--auth-green); font-size: 10px; font-weight: 800; }
.register-mobile-heading h1 { margin: 7px 0 0; font-size: 24px; line-height: 1.3; }
.register-mobile .register-form-grid { grid-template-columns: 1fr; }
.register-mobile .register-field-wide { grid-column: auto; }
.register-mobile .register-form fieldset { margin-bottom: 28px; }
.register-mobile .register-field input, .register-mobile .register-field select { min-height: 48px; }
.register-mobile .register-password-toggle { width: 100%; }
.register-mobile .register-semester-note { align-items: flex-start; flex-wrap: wrap; gap: 5px 9px; padding: 10px 12px; }
.register-mobile .register-semester-note small { flex: 0 0 100%; margin: 0; }
.register-mobile .register-submit { min-height: 50px; }

@media (max-width: 850px) {
  .register-desktop-main { grid-template-columns: 1fr; }
  .register-context { display: none; }
}