.fab-shell{--fab-navy:#113e53;--fab-teal:#0d7b86;--fab-pale:#edf7f7;--fab-warm:#fbf2e8;--fab-gold:#8a5c12;background:#f7faf9;min-height:calc(100vh - 76px);padding-bottom:36px}.fab-head{background:linear-gradient(120deg,#113e53,#176779);color:#fff;padding:28px 0 38px}.fab-back{color:#d8eef2;text-decoration:none;font-weight:750;font-size:.9rem}.fab-back:hover{color:#fff}.fab-course-flag{display:flex;gap:16px;align-items:center;margin:18px 0 20px;padding:12px 15px;border:1px solid rgba(255,220,160,.65);background:rgba(255,229,183,.12);border-radius:12px;color:#fff4df}.fab-course-flag strong{font-size:.76rem;letter-spacing:.09em;white-space:nowrap}.fab-course-flag span{font-size:.92rem}.fab-title-row{display:flex;justify-content:space-between;gap:36px;align-items:end}.fab-head .eyebrow{color:#ffd2a8}.fab-head h1{margin:4px 0 10px;font-size:clamp(2.2rem,5vw,4.1rem);line-height:1.02;letter-spacing:-.045em}.fab-head p{margin:0;max-width:760px;color:#dceef2;font-size:1.04rem}.fab-board-switch{display:flex;background:rgba(255,255,255,.1);padding:5px;border:1px solid rgba(255,255,255,.28);border-radius:12px;flex:0 0 auto}.fab-board-switch button{border:0;background:transparent;color:#eaf8fa;font-weight:800;padding:9px 14px;border-radius:8px}.fab-board-switch button.is-active{background:#fff;color:var(--fab-navy)}.fab-body{margin-top:-1px}.fab-tabs{display:grid;grid-template-columns:repeat(3,1fr);background:#fff;border:1px solid var(--line);border-top:0;border-radius:0 0 16px 16px;overflow:hidden;box-shadow:0 8px 22px rgba(13,58,76,.06)}.fab-tabs button{border:0;border-right:1px solid var(--line);background:#fff;padding:16px 18px;text-align:left;color:#4d626d}.fab-tabs button:last-child{border-right:0}.fab-tabs button>span{display:block;font-size:.68rem;letter-spacing:.12em;color:#85949a;font-weight:800}.fab-tabs button strong{display:block;color:var(--navy);font-size:1rem;margin-top:2px}.fab-tabs button small{display:block;margin-top:3px;line-height:1.35}.fab-tabs button.is-active{background:#eaf6f7;box-shadow:inset 0 -3px 0 var(--cyan)}.fab-module-intro{margin:25px 0 14px;background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px 20px}.fab-module-intro h2{margin:0 0 5px;color:var(--navy);font-size:1.35rem}.fab-module-intro p{margin:0;color:var(--muted)}.fab-module-intro .fab-scope{display:inline-block;margin-top:10px;padding:4px 8px;border-radius:999px;background:#fff1d8;color:#71460b;font-weight:800;font-size:.72rem;letter-spacing:.04em}.fab-layout{display:grid;grid-template-columns:285px minmax(0,1fr);gap:18px;align-items:start}.fab-sidebar{display:grid;gap:12px}.fab-session{display:grid;grid-template-columns:repeat(3,1fr);background:#fff;border:1px solid var(--line);border-radius:14px;overflow:hidden}.fab-session>div{padding:12px 10px;border-right:1px solid var(--line)}.fab-session>div:last-child{border-right:0}.fab-session small{display:block;text-transform:uppercase;letter-spacing:.07em;font-size:.62rem;color:#7a898f;font-weight:800}.fab-session strong{display:block;color:var(--navy);font-size:1rem;margin-top:2px}.fab-board-note,.fab-born-haber{background:#fff;border:1px solid var(--line);border-radius:14px;padding:16px}.fab-board-note{font-size:.88rem;color:#53666f;line-height:1.5}.fab-born-haber small{display:block;text-transform:uppercase;letter-spacing:.08em;font-size:.66rem;color:#7d6a50;font-weight:800}.fab-born-haber strong{display:block;color:var(--navy);margin:4px 0}.fab-born-haber p{font-size:.86rem;color:var(--muted);margin:0 0 10px}.fab-born-haber a{font-weight:800;color:var(--teal2);text-decoration:none}.fab-new{border:0;border-radius:11px;padding:11px 14px;background:var(--teal);color:#fff;font-weight:800}.fab-main{min-width:0}.fab-question{background:#fff;border:1px solid var(--line);border-radius:18px;padding:clamp(22px,4vw,40px);box-shadow:var(--shadow-soft);min-height:410px}.fab-kicker{margin:0 0 8px;text-transform:uppercase;letter-spacing:.1em;font-weight:800;color:var(--teal2);font-size:.74rem}.fab-question h2{margin:0 0 10px;color:var(--navy);font-size:clamp(1.55rem,3vw,2.25rem);line-height:1.15}.fab-question-copy{margin:0 0 24px;color:var(--muted);max-width:820px}.fab-options{display:grid;gap:10px}.fab-option{border:1px solid #afc0c5;background:#fff;border-radius:12px;padding:14px 15px;text-align:left;color:var(--navy);font-weight:740;line-height:1.4}.fab-option:hover{background:#eef8f8;border-color:#7eaab3}.fab-option.is-selected{border:2px solid var(--teal);background:#e9f7f5}.fab-multi-note{font-size:.82rem;color:var(--muted);margin:-10px 0 16px}.fab-number-form{display:flex;gap:10px;align-items:end;flex-wrap:wrap}.fab-number-form label{display:grid;gap:6px;font-weight:800;color:var(--navy)}.fab-number-form input{width:180px;padding:11px 12px;border:1px solid #aab9bd;border-radius:9px;font:inherit}.fab-number-form span{color:var(--muted);font-weight:700}.fab-submit{margin-top:20px;border:0;border-radius:11px;padding:12px 19px;background:var(--teal);color:#fff;font-weight:800}.fab-submit:disabled{opacity:.42;cursor:not-allowed}.fab-feedback,.fab-solution{margin-top:14px;border-radius:14px;padding:18px 20px}.fab-feedback.is-good{background:#ecf8ef;border:1px solid #b9dfc1;color:#155b36}.fab-feedback.is-bad{background:#fff2f0;border:1px solid #efc8c1;color:#832f2f}.fab-feedback strong{display:block;font-size:1.05rem;margin-bottom:3px}.fab-solution{background:#f2f6f5;border:1px solid #d5dfdd;color:var(--ink)}.fab-solution h3{margin:0 0 8px;color:var(--navy);font-size:1.1rem}.fab-solution p{margin:6px 0}.fab-next-row{display:flex;justify-content:space-between;gap:18px;align-items:center;margin-top:14px;padding:13px 4px;color:var(--muted)}.fab-next-row button{border:1px solid #8fa7ad;background:#fff;color:var(--navy);font-weight:800;border-radius:10px;padding:9px 13px}.fab-boundary-reminder{margin-top:26px;border-left:5px solid #c17b22;background:#fff7e8;padding:18px 20px;border-radius:0 14px 14px 0}.fab-boundary-reminder strong{color:#6f460f}.fab-boundary-reminder p{margin:5px 0 8px;color:#655f56}.fab-boundary-reminder a{color:var(--teal2);font-weight:800;text-decoration:none}.fab-foot{display:flex;justify-content:space-between;gap:20px;color:#73828a;font-size:.78rem;padding:16px 2px}.fab-foot a{color:var(--teal2)}@media(max-width:860px){.fab-title-row{display:grid;gap:20px}.fab-board-switch{justify-self:start}.fab-layout{grid-template-columns:1fr}.fab-sidebar{grid-template-columns:1fr 1fr}.fab-session{grid-column:1/-1}.fab-new{grid-column:1/-1}.fab-born-haber{display:none}}@media(max-width:650px){.fab-course-flag{display:grid;gap:4px}.fab-tabs{grid-template-columns:1fr}.fab-tabs button{border-right:0;border-bottom:1px solid var(--line)}.fab-tabs button:last-child{border-bottom:0}.fab-sidebar{grid-template-columns:1fr}.fab-session,.fab-new{grid-column:auto}.fab-number-form{align-items:stretch}.fab-number-form input{width:100%}.fab-foot{display:grid}}@media(max-width:430px){.fab-head{padding-top:23px}.fab-session{grid-template-columns:1fr}.fab-session>div{border-right:0;border-bottom:1px solid var(--line)}.fab-session>div:last-child{border-bottom:0}.fab-question{padding:20px}}