*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: var(--font-body); }

.auth-split { display: grid; grid-template-columns: 420px 1fr; min-height: 100vh; min-height: -webkit-fill-available; min-height: 100dvh; }
.auth-left { background: linear-gradient(160deg, var(--main-dark), var(--blue)); color: var(--main-text); display: flex; flex-direction: column; padding: 40px; position: relative; overflow: hidden; }
.auth-left::before { content: ''; position: absolute; width: 300px; height: 300px; border-radius: 50%; background: rgba(255,255,255,.06); right: -80px; top: -80px; }
.auth-left::after { content: ''; position: absolute; width: 200px; height: 200px; border-radius: 50%; background: rgba(255,255,255,.05); left: -50px; bottom: 60px; }
.auth-brand { display: flex; align-items: center; gap: 10px; text-decoration: none; z-index: 1; }
.auth-logo {
  height: 48px; width: calc(48px * var(--logo-lockup-ratio));
  background: url('/img/brand/logo-lockup.png') left center/contain no-repeat;
  flex: none;
}
.auth-brand span { font-family: var(--font-sub); font-weight: 800; font-size: var(--fs-2xl); color: #fff; }
.auth-left-content { flex: 1; display: flex; flex-direction: column; justify-content: center; gap: 16px; z-index: 1; }
.auth-left-title { font-family: var(--font-sub); font-weight: 800; font-size: 34px; line-height: 1.15; }
.auth-left-sub { font-size: var(--fs-lg); line-height: 1.6; opacity: .85; }
.auth-left-features { display: flex; flex-direction: column; gap: 10px; margin-top: 8px; }
.auth-feature { display: flex; align-items: center; gap: 12px; font-weight: 700; font-size: var(--fs-md); opacity: .9; }
.auth-feature span { font-size: var(--fs-2xl); }
.auth-left-footer { font-size: var(--fs-md); opacity: .7; z-index: 1; }
.auth-left-footer a { color: #fff; font-weight: 800; }

.auth-right { display: flex; align-items: center; justify-content: center; padding: 40px 24px; background: var(--surface-2); }
.auth-card { width: 100%; max-width: 420px; background: var(--surface); border-radius: var(--r-xl); padding: 36px 32px; box-shadow: 0 8px 40px rgba(0,0,0,.10); border: 1.5px solid var(--border); }

.auth-tabs { display: flex; gap: 0; background: var(--surface-3); border-radius: var(--r-md); padding: 4px; margin-bottom: 28px; }
.auth-tab { flex: 1; background: none; border: none; padding: 9px 12px; font-family: var(--font-body); font-weight: 800; font-size: var(--fs-md); color: var(--ink-soft); border-radius: var(--r-sm); cursor: pointer; transition: background .15s, color .15s; }
.auth-tab.active { background: var(--surface); color: var(--dark); box-shadow: 0 2px 8px rgba(0,0,0,.10); }

.auth-title { font-family: var(--font-sub); font-weight: 800; font-size: var(--fs-3xl); color: var(--dark); margin-bottom: 4px; }
.auth-sub-text { font-size: var(--fs-md); color: var(--ink-soft); font-weight: 600; margin-bottom: 22px; line-height: 1.5; }
.auth-form { display: flex; flex-direction: column; gap: 16px; margin-top: 16px; }
.form-group { display: flex; flex-direction: column; gap: 6px; }
.form-group label { font-size: var(--fs-base); font-weight: 800; color: var(--ink); letter-spacing: .2px; }
.form-group input[type=email],
.form-group input[type=text],
.form-group input[type=password] { width: 100%; padding: 12px 14px; border: 2px solid var(--border); border-radius: var(--r-md); font-family: var(--font-body); font-size: var(--fs-lg); font-weight: 700; color: var(--dark); outline: none; transition: border-color .15s; background: var(--surface-2); }
.form-group input:focus { border-color: var(--blue); background: var(--surface); }
.pw-wrap { position: relative; }
.pw-wrap input { padding-right: 44px; }
.pw-toggle { position: absolute; right: 12px; top: 50%; transform: translateY(-50%); background: none; border: none; cursor: pointer; color: var(--ink-soft); display: flex; align-items: center; }
.auth-submit { width: 100%; background: var(--accent-strong); color: var(--main-text); border: none; padding: 14px; border-radius: var(--r-md); font-family: var(--font-body); font-weight: 800; font-size: var(--fs-lg); cursor: pointer; transition: opacity .15s; margin-top: 4px; }
.auth-submit:hover:not(:disabled) { opacity: .88; }
.auth-submit:disabled { opacity: .45; cursor: not-allowed; }
.auth-error { background: var(--status-bad-bg); border: 1.5px solid #f0c4c0; color: var(--main-dark); border-radius: var(--r-md); padding: 11px 14px; font-size: var(--fs-md); font-weight: 700; display: flex; align-items: center; gap: 8px; margin-bottom: 4px; }

.code-boxes-wrap { position: relative; }
.code-boxes { display: flex; gap: 8px; margin-bottom: 8px; position: relative; z-index: 0; }
.code-box { flex: 1 1 0; min-width: 0; max-width: 52px; aspect-ratio: 44 / 52; height: auto; border: 2.5px solid var(--border); border-radius: var(--r-md); display: flex; align-items: center; justify-content: center; font-family: var(--font-sub); font-weight: 800; font-size: var(--fs-2xl); color: var(--dark); transition: border-color .15s, background .15s; background: var(--surface-2); }
.code-box.filled { border-color: var(--blue); background: var(--status-info-bg); color: var(--blue); }
.code-box.active { border-color: var(--blue); box-shadow: 0 0 0 3px rgba(var(--main-rgb),.15); }
.code-hidden-input {
  position: absolute !important; inset: 0; z-index: 1;
  width: 100% !important; height: 100% !important; margin: 0 !important; padding: 0 !important;
  border: none !important; border-radius: 0 !important;
  background: transparent !important; color: transparent !important; caret-color: transparent !important;
  font-size: var(--fs-lg) !important; cursor: text; outline: none !important;
}
.code-hidden-input::placeholder { color: transparent !important; }
.code-hint { font-size: var(--fs-sm); font-weight: 700; color: var(--ink-soft); margin-top: 4px; }

.auth-hint { margin-top: 24px; border-top: 1.5px solid var(--border); padding-top: 18px; }
.hint-title { font-size: var(--fs-xs); font-weight: 800; letter-spacing: .8px; color: var(--ink-soft); text-transform: uppercase; margin-bottom: 10px; }
.hint-row { display: flex; align-items: center; gap: 10px; padding: 9px 12px; border-radius: var(--r-sm); cursor: pointer; transition: background .15s; }
.hint-row:hover { background: var(--status-info-bg); }
.hint-badge { font-size: var(--fs-xs); font-weight: 800; padding: 3px 8px; border-radius: var(--r-pill); white-space: nowrap; }
.hint-badge.admin { background: var(--status-bad-bg); color: var(--purple); }
.hint-badge.teacher { background: var(--status-info-bg); color: var(--blue); }
.hint-badge.student { background: var(--status-good-bg); color: var(--status-good); }
.hint-cred { font-size: var(--fs-base); font-weight: 700; color: var(--ink-soft); font-family: monospace; }

@media (max-width: 700px) {
  .auth-split { grid-template-columns: 1fr; }
  .auth-left { display: none; }
  .auth-right { padding: var(--sp-6) var(--sp-4); }
  .auth-card { border-radius: var(--r-xl); padding: var(--sp-7) var(--sp-5); }
}
@media (max-width: 480px) {
  .auth-right { padding: var(--sp-4) var(--sp-3); align-items: flex-start; }
  .auth-card { padding: var(--sp-6) var(--sp-4); }
  .code-boxes { gap: var(--sp-1); }
}
@media (max-width: 360px) {
  .auth-right { padding: var(--sp-3) var(--sp-2); }
  .auth-card { padding: var(--sp-5) var(--sp-3); border-radius: var(--r-lg); }
  .code-box { font-size: var(--fs-lg); border-width: 2px; }
}
@media (max-height: 520px) and (orientation: landscape) {
  .auth-right { align-items: flex-start; padding-top: var(--sp-4); }
  .auth-card { padding: var(--sp-5) var(--sp-5); }
}

.auth-brand span, .auth-left-title, .auth-title { font-family: var(--font-display); letter-spacing: .5px; }