.signin-container{background:var(--color-bg-primary);min-height:100vh;padding:var(--space-xl);justify-content:center;align-items:center;display:flex;position:relative;overflow:hidden}.signin-container:before{content:"";pointer-events:none;background:radial-gradient(circle,#8b7dd814 0%,#0000 70%);width:600px;height:600px;position:fixed;top:-200px;right:-200px}.signin-container:after{content:"";pointer-events:none;background:radial-gradient(circle,#ff6b9d0d 0%,#0000 70%);width:400px;height:400px;position:fixed;bottom:-100px;left:-100px}.signin-content{z-index:1;width:100%;max-width:420px;animation:.5s ease-out fadeInUp;position:relative}.signin-glow{filter:blur(40px);pointer-events:none;z-index:0;will-change:transform;background:radial-gradient(circle,#8b7dd826 0%,#0000 70%);width:400px;height:400px;position:fixed;top:0;left:0}.signin-logo{justify-content:center;margin-bottom:1.1rem;display:flex}.signin-logo>*{filter:drop-shadow(0 6px 24px #8b7dd859);background:radial-gradient(at 50% 45%,#8b7dd84d 0%,#0000 72%);border-radius:20px;padding:.65rem}.signin-title-gradient{background:linear-gradient(135deg,#8b7dd8 0%,#ff6b9d 55%,#ffa64d 100%) 0 0/200%;-webkit-text-fill-color:transparent;-webkit-background-clip:text;background-clip:text}.signin-card{background:linear-gradient(180deg, #ffffff0f 0%, #ffffff05 100%), var(--surface-glass);border:1px solid var(--border-strong);-webkit-backdrop-filter:blur(20px);border-radius:22px;flex-direction:column;gap:1.15rem;padding:1.85rem 1.75rem;display:flex;position:relative;box-shadow:inset 0 1px #ffffff0f,0 20px 60px #00000059,0 0 0 1px #8b7dd80f}.signin-card:before{content:"";pointer-events:none;background:radial-gradient(at 50% 0,#8b7dd824 0%,#0000 70%);border-radius:22px 22px 0 0;height:80px;position:absolute;inset:-1px -1px auto}.signin-wordmark{letter-spacing:.15em;text-transform:uppercase;background:linear-gradient(135deg, var(--text-primary) 0%, var(--color-accent) 100%);-webkit-text-fill-color:transparent;text-align:center;margin-bottom:var(--space-3xl);-webkit-background-clip:text;background-clip:text;font-size:1rem;font-weight:700}.signin-title{color:var(--color-text-primary);text-align:center;letter-spacing:-.03em;margin:0 0 .6rem;font-size:2rem;font-weight:800;line-height:1.1}.signin-subtitle{color:var(--color-text-secondary);text-align:center;margin:0 0 var(--space-2xl) 0;font-size:.95rem;font-weight:400;line-height:1.6}.signin-form{gap:var(--space-lg);flex-direction:column;display:flex}.signin-error{color:var(--color-red);padding:var(--space-md);border-radius:var(--radius-md);text-align:center;background:#ff6b6b1a;border:1px solid #ff6b6b33;font-size:.875rem}.signin-field{gap:var(--space-sm);flex-direction:column;display:flex}.signin-label{color:var(--color-text-secondary);letter-spacing:.02em;font-size:.8rem;font-weight:500}.signin-input{background:var(--input-surface);border:1px solid var(--border-strong);border-radius:var(--radius-md);color:var(--color-text-primary);transition:all var(--transition-base);outline:none;padding:.9rem 1rem;font-family:inherit;font-size:.95rem}.signin-input:hover:not(:focus):not(:disabled){border-color:var(--color-accent)}.signin-input:focus{border-color:var(--color-accent);background:var(--input-surface-focus);box-shadow:0 0 0 3px #8b7dd82e}.signin-input:disabled{opacity:.5;cursor:not-allowed}.signin-input::placeholder{color:var(--color-text-tertiary)}.signin-birth-row{gap:.5rem;display:flex}.signin-birth-select{flex:2}.signin-birth-num{appearance:textfield;flex:1;min-width:0}.signin-birth-num::-webkit-outer-spin-button{-webkit-appearance:none;margin:0}.signin-birth-num::-webkit-inner-spin-button{-webkit-appearance:none;margin:0}.signin-field-hint{color:var(--color-text-muted);font-size:.75rem}.signin-button{background:linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-light) 100%);border-radius:var(--radius-full);color:var(--color-bg-primary);cursor:pointer;transition:all var(--transition-base);margin-top:var(--space-sm);border:none;padding:.875rem 1.5rem;font-family:inherit;font-size:.95rem;font-weight:600}.signin-button:hover:not(:disabled){box-shadow:var(--shadow-glow);transform:translateY(-2px)}.signin-button:active:not(:disabled){transform:translateY(0)}.signin-button:disabled{opacity:.6;cursor:not-allowed}.google-oauth-button{background:var(--chip-bg);border:1px solid var(--ghost-border);border-radius:var(--radius-full);width:100%;color:var(--color-text-primary);cursor:pointer;transition:all var(--transition-base);justify-content:center;align-items:center;gap:.625rem;padding:.875rem 1.5rem;font-family:inherit;font-size:.95rem;font-weight:600;display:flex}.google-oauth-button:hover{background:var(--chip-bg-hover);border-color:var(--ghost-border-hover);transform:translateY(-1px);box-shadow:0 6px 18px #00000040}.google-oauth-button:active{transform:translateY(0)}.signin-teacher-note{border-radius:var(--radius-md);padding:var(--space-md) var(--space-lg);background:#8b7dd80f;border:1px solid #8b7dd826;font-size:.875rem;line-height:1.6}.signin-teacher-note p{color:var(--color-text-secondary);margin:0}.signin-teacher-note p+p{margin-top:.25rem}.signin-divider{color:var(--color-text-tertiary);align-items:center;gap:.75rem;margin:.25rem 0;font-size:.8rem;display:flex}.signin-divider:before,.signin-divider:after{content:"";background:var(--border-default);flex:1;height:1px}.signin-footer{text-align:center;margin-top:var(--space-xl);font-size:.875rem}.signin-footer-text{color:var(--color-text-tertiary)}.signin-footer-link{color:var(--color-accent);transition:color var(--transition-fast);font-weight:500;text-decoration:none}.signin-footer-link:hover{color:var(--color-accent-light)}.signin-role-picker{grid-template-columns:1fr 1fr;gap:.75rem;margin-bottom:0;display:grid}.signin-role-tile{background:var(--input-surface);border:1px solid var(--border-strong);border-radius:var(--radius-md);color:var(--color-text-tertiary);cursor:pointer;flex-direction:column;align-items:center;gap:.4rem;padding:.85rem;font-family:inherit;font-size:.82rem;font-weight:600;transition:all .15s;display:flex}.signin-role-tile:hover{background:var(--input-surface-focus);border-color:var(--color-accent);color:var(--color-text-primary)}.signin-role-tile--active{color:var(--color-text-primary);background:#8b7dd824;border-color:#8b7dd899;box-shadow:0 0 0 2px #8b7dd82e}.signin-role-tile--active svg{color:var(--color-accent)}.legal-links{text-align:center;margin-top:var(--space-lg);font-size:.8rem}.legal-link{color:var(--color-text-muted);transition:color var(--transition-fast);text-decoration:none}.legal-link:hover{color:var(--color-accent)}.legal-separator{color:var(--color-text-muted);margin:0 .75rem}.forgot-password-link{text-align:right;margin-top:-.5rem;display:block}.forgot-password-link a{color:var(--color-text-tertiary);transition:color var(--transition-fast);font-size:.8rem;text-decoration:none}.forgot-password-link a:hover{color:var(--color-accent)}.success-message{text-align:center;padding:var(--space-xl);border-radius:var(--radius-lg);margin-bottom:var(--space-lg);background:#8b7dd81a;border:1px solid #8b7dd833}.success-message p{color:var(--color-text-primary);margin:0 0 .5rem;font-size:.95rem}.success-message .success-note{color:var(--color-text-secondary);margin-bottom:var(--space-md);font-size:.85rem}.back-to-signin{color:var(--color-accent);margin-top:var(--space-sm);transition:color var(--transition-fast);font-size:.875rem;text-decoration:none;display:inline-block}.back-to-signin:hover{color:var(--color-accent-light)}@media (max-width:640px){.signin-container{padding:var(--space-lg)}.signin-content{max-width:100%}.signin-title{font-size:1.5rem}.signin-subtitle{font-size:.875rem}}@keyframes fadeInUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}