body.student-login{margin:0;min-height:100vh;background:linear-gradient(135deg,#667eea,#764ba2);color:#1f2937;font-family:system-ui,-apple-system,Segoe UI,PingFang SC,Microsoft YaHei,sans-serif}.login-shell{--md-ink: #1F2937;--md-quiet: #6B7280;--md-primary: #667EEA;--md-primary-strong: #5A67D8;--md-danger: #DC2626;--md-line: #E5E7EB;--md-card: rgba(255, 255, 255, .95);position:relative;display:flex;align-items:center;justify-content:center;min-height:100vh;padding:2.5rem 1.25rem 3rem;overflow-x:hidden;box-sizing:border-box}.login-shell__decor{position:absolute;inset:0;overflow:hidden;pointer-events:none}.login-shell__decor span{position:absolute;display:block;border-radius:50%;background:#ffffff1f}.login-shell__decor span:nth-child(1){width:220px;height:220px;top:-60px;left:-60px}.login-shell__decor span:nth-child(2){width:160px;height:160px;right:-40px;bottom:12%}.login-shell__decor span:nth-child(3){width:120px;height:120px;left:8%;bottom:-40px}.login-content{position:relative;width:100%;max-width:60rem}.login-brand{margin:0;font-size:2rem;font-weight:700;letter-spacing:.02em;text-align:center;color:#fff;text-shadow:0 2px 8px rgba(31,41,55,.25)}.login-brand__eyebrow{margin:0 0 .375rem;font-size:.8125rem;letter-spacing:.18em;text-align:center;color:#ffffffd9}.login-cards{display:grid;gap:1.25rem;margin-top:1.75rem}.login-card{padding:1.75rem 1.5rem;background:var(--md-card);border:1px solid rgba(255,255,255,.6);border-radius:18px;box-shadow:0 18px 40px #1f293738;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);box-sizing:border-box}.login-card__title{margin:0;font-size:1.125rem;font-weight:700;color:var(--md-ink)}.login-card__hint{margin:.5rem 0 0;font-size:.875rem;line-height:1.7;color:var(--md-quiet)}.login-form{display:flex;flex-direction:column;gap:1rem;margin-top:1.25rem}.login-field{display:flex;flex-direction:column;gap:.375rem;font-size:.875rem;color:var(--md-quiet)}.login-input{width:100%;min-height:48px;padding:0 .75rem;font-family:inherit;font-size:1rem;color:var(--md-ink);background:#fff;border:1px solid var(--md-line);border-radius:10px;box-sizing:border-box}.login-input--mono{font-variant-numeric:tabular-nums;letter-spacing:.12em}.login-row{display:flex;flex-wrap:wrap;align-items:flex-end;gap:.75rem}.login-row .login-field{flex:1 1 10rem}.login-captcha{display:block;width:180px;height:60px;padding:0;background:#f3f4f6;border:1px solid var(--md-line);border-radius:10px;cursor:pointer;object-fit:cover}.login-ghost{min-height:44px;padding:.5rem .75rem;font-family:inherit;font-size:.875rem;color:var(--md-ink);background:#fff;border:1px solid var(--md-line);border-radius:10px;cursor:pointer;white-space:nowrap}.login-ghost:hover{border-color:var(--md-primary);color:var(--md-primary-strong)}.login-toggle{display:inline-flex;align-items:center;gap:.375rem;min-height:44px;font-size:.875rem;color:var(--md-quiet);cursor:pointer}.login-toggle input{width:1rem;height:1rem;accent-color:var(--md-primary)}.login-submit{display:block;width:100%;min-height:52px;font-family:inherit;font-size:1.0625rem;font-weight:600;color:#fff;background:var(--md-primary);border:0;border-radius:10px;cursor:pointer}.login-submit:hover:not([disabled]){background:var(--md-primary-strong)}.login-submit[disabled]{cursor:progress;opacity:.72}.login-error{margin:0;padding:.625rem .75rem;font-size:.9375rem;color:var(--md-ink);background:#fef2f2;border-left:3px solid var(--md-danger);border-radius:6px}.login-error[hidden]{display:none}.login-footnote{margin:1.25rem 0 0;padding-top:1rem;font-size:.8125rem;color:var(--md-quiet);border-top:1px solid var(--md-line)}.login-entry{display:flex;align-items:center;justify-content:center;width:100%;min-height:52px;margin-top:1.25rem;padding:0 1.25rem;font-size:1.0625rem;font-weight:600;color:#fff;background:var(--md-primary);border-radius:10px;text-decoration:none;box-sizing:border-box}.login-entry:hover{background:var(--md-primary-strong)}.login-shell :focus-visible{outline:2px solid var(--md-primary);outline-offset:2px;border-radius:4px}@media(min-width:900px){.login-cards{grid-template-columns:1.25fr 1fr;align-items:start}}@media(max-width:480px){.login-brand{font-size:1.625rem}.login-card{padding:1.375rem 1.125rem}}@media(prefers-reduced-motion:reduce){.login-shell *,.login-shell *:before,.login-shell *:after{transition:none!important;animation:none!important}}