.math-coach-intro{display:grid;grid-template-columns:minmax(0,1.4fr) minmax(250px,.6fr);gap:20px;align-items:start;margin-bottom:16px}
.math-coach-intro h3{font-size:1.35rem;margin:.3rem 0 .65rem}.math-coach-boundary{background:var(--surface-2);border-radius:12px;padding:13px 15px;font:500 .84rem/1.5 system-ui,-apple-system,sans-serif}.math-coach-boundary strong{display:block;color:var(--accent-2);margin-bottom:4px}
.math-coach-form{padding:20px;margin-bottom:14px}.math-coach-entry-grid{display:grid;grid-template-columns:minmax(280px,1fr) minmax(150px,.24fr) minmax(220px,.34fr) auto;gap:10px;align-items:end}.math-coach-entry-grid .field input,.math-coach-entry-grid .field select{width:100%;min-height:48px}.math-coach-entry-grid .field input{font-size:1.05rem}.math-coach-entry-grid .btn{min-height:48px;padding-inline:18px}
.math-coach-examples{display:flex;gap:7px;flex-wrap:wrap;align-items:center;margin-top:14px}.math-coach-examples>span{font:700 .72rem system-ui,-apple-system,sans-serif;text-transform:uppercase;letter-spacing:.07em;color:var(--muted)}.math-example-chip{border:1px solid var(--line);background:#fff;color:var(--deep);border-radius:999px;padding:6px 10px;font:600 .82rem system-ui,-apple-system,sans-serif}.math-example-chip:hover{border-color:var(--accent);background:#fbf7ee}
.math-coach-help{font:.8rem/1.5 system-ui,-apple-system,sans-serif;color:var(--muted);margin:10px 0 0}.math-coach-status{min-height:24px;margin:4px 2px 10px;font:700 .82rem system-ui,-apple-system,sans-serif}.math-coach-status.success{color:#2f613a}.math-coach-status.error{color:#8a362f;background:#fff5f3;border:1px solid #e7c3be;border-radius:10px;padding:10px 12px}
.math-coach-lesson-context{display:flex;justify-content:space-between;gap:16px;align-items:center;background:#edf3ed;border:1px solid #cddccc;border-radius:13px;padding:12px 14px;margin-bottom:14px}.math-coach-lesson-context strong{display:block;font-size:1.02rem;margin-top:2px}.math-coach-lesson-context p{margin:3px 0 0;color:var(--muted);font-size:.9rem}
.math-coach-result{display:grid;gap:12px;scroll-margin-top:170px}.math-coach-answer{border-left:5px solid var(--accent-2)}.math-coach-answer-head{display:flex;justify-content:space-between;gap:15px;align-items:start}.math-coach-answer-head h3{font-size:clamp(1.2rem,2.4vw,1.7rem);margin:.3rem 0 0;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;overflow-wrap:anywhere}.math-coach-verified{white-space:nowrap;border-radius:999px;padding:5px 9px;background:var(--good);color:#2f613a;font:700 .75rem system-ui,-apple-system,sans-serif}
.math-coach-final{display:grid;grid-template-columns:auto minmax(0,1fr);column-gap:14px;align-items:baseline;background:var(--deep);color:#fff;border-radius:13px;padding:14px 16px;margin-top:15px}.math-coach-final span{font:700 .72rem system-ui,-apple-system,sans-serif;text-transform:uppercase;letter-spacing:.1em;color:#d9e5dc}.math-coach-final strong{font:700 clamp(1.25rem,3vw,2rem)/1.25 ui-monospace,SFMono-Regular,Menlo,monospace;overflow-wrap:anywhere}.math-coach-final small{grid-column:2;font:500 .8rem system-ui,-apple-system,sans-serif;color:#d9e5dc;margin-top:3px}.math-coach-verification{margin:11px 2px 0;overflow-wrap:anywhere}
.math-coach-tabs{display:flex;gap:7px;overflow-x:auto;scrollbar-width:none;margin-top:2px}.math-coach-tab{border:1px solid var(--line);border-radius:999px;background:var(--surface);color:var(--deep);padding:9px 13px;white-space:nowrap;font-weight:700}.math-coach-tab.active{background:var(--deep);color:#fff;border-color:var(--deep)}.math-coach-view{display:none}.math-coach-view.active{display:block}
.math-coach-steps{list-style:none;padding:0;margin:13px 0 0;display:grid;gap:10px}.math-coach-steps>li{display:grid;grid-template-columns:32px minmax(0,1fr);gap:11px;align-items:start;border:1px solid var(--line);border-radius:12px;background:#faf7f0;padding:11px 12px}.math-coach-step-number{width:28px;height:28px;border-radius:50%;display:grid;place-items:center;background:var(--deep);color:#fff;font:700 .78rem system-ui,-apple-system,sans-serif}.math-coach-equation{font:700 1.02rem/1.45 ui-monospace,SFMono-Regular,Menlo,monospace;overflow-wrap:anywhere}.math-coach-steps p{margin:4px 0 0;color:var(--muted);font:.84rem/1.5 system-ui,-apple-system,sans-serif}.math-coach-steps.compact .math-coach-step-number{background:var(--accent-2)}
.math-coach-teach-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.math-coach-teach-grid .card{box-shadow:none}.math-coach-teach-grid ul{margin:.6rem 0 0;padding-left:20px}.math-coach-teach-grid li+li{margin-top:7px}.math-coach-script{grid-column:1/-1;border-left:4px solid var(--accent)}.math-coach-script>p{font-size:1.03rem;line-height:1.6}.math-coach-materials{margin-top:12px;padding:10px 12px;background:var(--surface-2);border-radius:10px;font:.86rem/1.5 system-ui,-apple-system,sans-serif}
.math-coach-scope{margin-top:18px}.math-coach-scope summary{cursor:pointer;font-weight:700}.math-coach-scope-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:12px}.math-coach-scope-grid ul{margin:.5rem 0 0;padding-left:20px}
@media(max-width:820px){.math-coach-intro{grid-template-columns:1fr}.math-coach-entry-grid{grid-template-columns:1fr 1fr}.math-coach-entry-grid .field:first-child{grid-column:1/-1}.math-coach-entry-grid .btn{width:100%}}
@media(max-width:640px){.math-coach-entry-grid,.math-coach-teach-grid,.math-coach-scope-grid{grid-template-columns:1fr}.math-coach-entry-grid .field:first-child,.math-coach-script{grid-column:auto}.math-coach-answer-head{display:grid}.math-coach-verified{justify-self:start}.math-coach-final{grid-template-columns:1fr}.math-coach-final small{grid-column:auto}.math-coach-lesson-context{align-items:start;flex-direction:column}.math-coach-lesson-context .btn{width:100%}}
.math-coach-method-note{margin:10px 0 0;padding:9px 11px;border-left:3px solid var(--accent);background:#fbf7ee;border-radius:0 9px 9px 0;color:var(--muted);font:.78rem/1.5 system-ui,-apple-system,sans-serif}
.singapore-cpa{display:grid;gap:10px;margin-bottom:12px}.singapore-cpa-head{padding:4px 2px}.singapore-cpa-head h3{margin:.3rem 0}.singapore-cpa-head p{margin:.25rem 0;color:var(--muted)}
.singapore-cpa-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}.singapore-cpa-grid>.card{box-shadow:none;border-top:4px solid var(--accent)}.singapore-cpa-grid>.card:nth-child(2){border-top-color:var(--accent-2)}.singapore-cpa-grid>.card:nth-child(3){border-top-color:var(--deep)}.singapore-cpa-grid h3,.singapore-model h3{margin:.3rem 0 .65rem}
.singapore-model p{font:.82rem/1.45 system-ui,-apple-system,sans-serif;color:var(--muted);margin:11px 0 0}.singapore-model-total{text-align:center;margin-top:8px;font:700 .8rem/1.4 system-ui,-apple-system,sans-serif;color:var(--deep)}
.singapore-number-bond{display:grid;justify-items:center;gap:3px;min-height:126px}.singapore-bond-whole,.singapore-bond-parts span{display:grid;place-items:center;width:54px;height:54px;border:2px solid var(--accent-2);background:#fff;border-radius:50%;font:800 1rem ui-monospace,SFMono-Regular,Menlo,monospace}.singapore-bond-line{height:25px;width:92px;border-left:2px solid var(--accent-2);border-right:2px solid var(--accent-2);border-top:2px solid var(--accent-2);border-radius:12px 12px 0 0}.singapore-bond-parts{display:flex;gap:38px;margin-top:-3px}
.singapore-bar{display:flex;min-height:48px;overflow:hidden;border:2px solid var(--accent-2);border-radius:8px;background:#fff}.singapore-bar span{flex:1;display:grid;place-items:center;min-width:32px;padding:7px 5px;border-right:1px solid var(--accent-2);font:800 .88rem ui-monospace,SFMono-Regular,Menlo,monospace}.singapore-bar span:last-child{border-right:0}.singapore-bar .singapore-known{min-width:92px;background:var(--surface-2);font-family:system-ui,-apple-system,sans-serif;font-weight:700}
.singapore-percent{position:relative;height:52px;border:2px solid var(--accent-2);border-radius:8px;overflow:hidden;background:repeating-linear-gradient(90deg,#fff 0,#fff calc(10% - 1px),#d9cfb9 calc(10% - 1px),#d9cfb9 10%)}.singapore-percent>div{position:absolute;inset:0 auto 0 0;background:rgba(193,143,45,.42);border-right:2px solid var(--accent)}.singapore-percent>span{position:absolute;inset:0;display:grid;place-items:center;font:800 .9rem system-ui,-apple-system,sans-serif}
.singapore-balance,.singapore-fraction-pair{display:flex;align-items:center;justify-content:center;gap:9px;min-height:60px;padding:10px;border:2px solid var(--accent-2);border-radius:9px;background:#fff;font:750 .9rem/1.35 ui-monospace,SFMono-Regular,Menlo,monospace;text-align:center;overflow-wrap:anywhere}.singapore-balance span,.singapore-fraction-pair span{padding:8px;background:var(--surface-2);border-radius:7px}.singapore-fraction-pair{flex-wrap:wrap}
@media(max-width:1050px){.math-coach-entry-grid{grid-template-columns:1fr 1fr}.math-coach-entry-grid .field:first-child{grid-column:1/-1}.math-coach-entry-grid .btn{width:100%}}
@media(max-width:820px){.singapore-cpa-grid{grid-template-columns:1fr}.singapore-cpa-grid>.card{min-width:0}}
@media(max-width:640px){.singapore-bar span{min-width:25px;font-size:.76rem}.singapore-bond-parts{gap:28px}}