:root{--ink:#11243c;--muted:#6f7d90;--line:#dce4ec;--blue:#536ee5;--teal:#36aeb7;--gold:#d4ad55;--rose:#bf5577}
*{box-sizing:border-box}body.auth-body{margin:0;min-height:100vh;background:radial-gradient(circle at 10% 0,#dce8ff,transparent 28%),radial-gradient(circle at 92% 8%,#efdce8,transparent 24%),linear-gradient(180deg,#f4f7fa,#edf2f6);font-family:Montserrat,Arial,sans-serif;color:var(--ink)}.auth-shell{width:min(1180px,calc(100% - 24px));margin:auto;padding:18px 0 50px}.auth-top{display:flex;justify-content:space-between;align-items:center;gap:12px}.auth-brand{display:flex;align-items:center;gap:10px;color:#fff;padding:10px 13px;border-radius:15px;background:#122740}.auth-brand span:first-child{display:grid;place-items:center;width:36px;height:36px;border:1px solid #ffffff35;border-radius:50%;font:800 9px "Roboto Mono"}.auth-brand b{display:block;font:400 18px "DM Serif Display"}.auth-brand small{display:block;font:700 8px "Roboto Mono";letter-spacing:.13em;color:#92dde4}.auth-top>a{color:#40536b;font-size:11px;font-weight:800}.auth-card{display:grid;grid-template-columns:.9fr 1.1fr;overflow:hidden;margin-top:22px;border:1px solid var(--line);border-radius:30px;background:#fff;box-shadow:0 30px 90px #152c4515}.auth-story{padding:44px;background:radial-gradient(circle at 85% 10%,#5bbfc526,transparent 25%),radial-gradient(circle at 20% 90%,#b4658b1d,transparent 26%),linear-gradient(145deg,#10233b,#173957);color:#fff}.auth-story .kicker,.auth-panel .kicker{margin:0 0 8px;font:800 9px "Roboto Mono";letter-spacing:.15em;color:#8edfe5}.auth-story h1{margin:10px 0 17px;font:400 58px/.95 "DM Serif Display"}.auth-story p{color:#c5d0dc;line-height:1.65;font-size:12px}.auth-points{display:grid;gap:9px;margin-top:28px}.auth-points div{padding:13px;border:1px solid #ffffff15;border-radius:14px;background:#ffffff08}.auth-points b{display:block;font-size:11px}.auth-points span{display:block;margin-top:3px;color:#b9c6d5;font-size:9px;line-height:1.5}.auth-panel{padding:38px}.auth-tabs{display:flex;gap:7px;margin-bottom:25px}.auth-tabs button{flex:1;border:1px solid #dce3eb;border-radius:999px;background:#f8fafc;padding:10px;font-weight:800;color:#617083;cursor:pointer}.auth-tabs button.active{background:#193958;color:#fff;border-color:#193958}.auth-form{display:none}.auth-form.active{display:block}.auth-form h2{margin:4px 0 16px;font:400 31px "DM Serif Display"}.auth-form label{display:grid;gap:6px;margin-bottom:11px;font:800 8px "Roboto Mono";letter-spacing:.08em;color:#6b7888}.auth-form input{height:45px;border:1px solid #d7e0e8;border-radius:11px;padding:0 12px;background:#fbfcfd;font:600 12px Montserrat;outline:none}.auth-form input:focus{border-color:#7d9ce7;box-shadow:0 0 0 3px #6d8ee51a}.teacher-toggle{margin:13px 0;padding:13px;border:1px solid #e1e6ed;border-radius:13px;background:#f8fafc}.teacher-toggle button{border:0;background:none;color:#4d6986;font-weight:800;cursor:pointer}.invite-area{margin-top:10px;padding-top:10px;border-top:1px solid #e4e8ed}.invite-area[hidden]{display:none}.auth-submit{width:100%;border:0;border-radius:12px;background:linear-gradient(135deg,#365fd1,#3aa6ad);color:#fff;padding:13px;font-weight:900;cursor:pointer}.auth-note{margin-top:12px;color:#7b8794;font-size:9px;line-height:1.55}.auth-message{min-height:34px;margin-top:12px;padding:9px 11px;border-radius:10px;font-size:10px}.auth-message:empty{padding:0;min-height:0}.auth-message.error{background:#fff0f3;color:#9d4960}.auth-message.ok{background:#eef8f4;color:#347a64}.admin-rule{margin-top:18px;padding:12px;border-left:3px solid var(--gold);background:#fff7e5;color:#71591e;font-size:9px;line-height:1.55}@media(max-width:820px){.auth-card{grid-template-columns:1fr}.auth-story{padding:28px}.auth-story h1{font-size:44px}.auth-panel{padding:27px}}