:root {
  --ink: #1a1d24;
  --ink-soft: #3b4150;
  --muted: #6b7280;
  --paper: #fbfaf7;
  --paper-2: #f3efe6;
  --rule: #e6e1d8;
  --accent: #b14a26;
  --accent-soft: #fdebe1;
  --accent-strong: #8c3a1d;
  --teal: #1f5b66;
  --teal-soft: #e7f1f2;
  --green: #2f7a3a;
  --green-soft: #e3f2dc;
  --warn: #8a5a00;
  --warn-soft: #fdf3d4;
  --shadow: 0 1px 3px rgba(26,29,36,.05), 0 4px 12px rgba(26,29,36,.05);
}
*{box-sizing:border-box}
html,body{margin:0;padding:0;background:var(--paper);color:var(--ink);
  font:16px/1.6 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  -webkit-font-smoothing:antialiased;}
h1,h2,h3,h4{font-family:Georgia,"Iowan Old Style",serif;letter-spacing:-.01em;font-weight:600;color:var(--ink);margin:0 0 .5rem}
h1{font-size:2.4rem;line-height:1.1}
h2{font-size:1.6rem;line-height:1.2;margin-top:2rem}
h3{font-size:1.15rem;margin-top:1.5rem}
em{font-style:italic;color:var(--accent)}
.muted{color:var(--muted)}
.small{font-size:.88rem}
.medium-emph{font-weight:600;font-size:1.1rem;color:var(--ink)}
.big-number{font-family:Georgia,serif;font-size:2.6rem;font-weight:600;color:var(--accent);line-height:1}
.eyebrow{text-transform:uppercase;letter-spacing:.12em;font-size:.78rem;font-weight:700;color:var(--accent)}

/* topbar */
.topbar{display:flex;align-items:center;justify-content:space-between;padding:.9rem 1.6rem;border-bottom:1px solid var(--rule);background:var(--paper);position:sticky;top:0;z-index:10}
.brand{display:flex;align-items:center;gap:.5rem;font-family:Georgia,serif;font-size:1.3rem;font-weight:600}
.brand .logo{color:var(--accent);font-size:1.2rem;font-weight:700}
.topnav{display:flex;gap:.4rem}
.navlink{background:transparent;border:1px solid var(--rule);color:var(--ink);padding:.4rem .8rem;border-radius:6px;cursor:pointer;font-size:.9rem;font-weight:500}
.navlink:hover{background:var(--paper-2)}
.navlink.subtle{color:var(--muted)}

/* layout */
.view{max-width:1080px;margin:0 auto;padding:2.5rem 1.5rem 5rem}

/* hero */
.hero{padding:2rem 0 2rem;border-bottom:1px solid var(--rule)}
.hero h1{font-size:3rem;line-height:1.05;margin-top:.6rem;max-width:14ch}
.hero .lede{font-size:1.2rem;color:var(--ink-soft);max-width:60ch;margin:1rem 0 1.8rem}
.hero-cta{display:flex;gap:1rem;flex-wrap:wrap}

/* buttons */
.btn{font-size:.95rem;padding:.6rem 1.1rem;border-radius:6px;border:1px solid transparent;cursor:pointer;font-family:inherit;font-weight:500;text-decoration:none;display:inline-flex;align-items:center;gap:.4rem}
.btn.primary{background:var(--accent);color:#fff;border-color:var(--accent)}
.btn.primary:hover{background:var(--accent-strong);border-color:var(--accent-strong)}
.btn.secondary{background:transparent;color:var(--ink);border-color:var(--rule)}
.btn.secondary:hover{background:var(--paper-2)}
.btn.ghost{background:transparent;color:var(--teal);border-color:transparent}
.btn.ghost:hover{background:var(--teal-soft)}
.btn:disabled{opacity:.5;cursor:not-allowed}

/* curricula grid */
.curricula{padding:2.5rem 0;border-bottom:1px solid var(--rule)}
.curricula-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:1rem;margin-top:1.5rem}
.curr-card{background:#fff;border:1px solid var(--rule);border-radius:8px;padding:1.1rem 1.2rem;cursor:pointer;transition:transform .12s, box-shadow .12s, border-color .12s;text-align:left}
.curr-card:hover{border-color:var(--accent);transform:translateY(-1px);box-shadow:var(--shadow)}
.curr-card h3{font-size:1.05rem;font-family:inherit;font-weight:600;letter-spacing:0;margin:0 0 .25rem}
.curr-card .meta{font-size:.82rem;color:var(--muted);display:flex;gap:.4rem;flex-wrap:wrap;margin-top:.4rem}
.curr-card .tag{display:inline-block;background:var(--paper-2);color:var(--ink-soft);padding:.1rem .5rem;border-radius:99px;font-size:.74rem;font-weight:500}

/* how grid */
.how{padding:2.5rem 0}
.how-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:1.2rem;margin-top:1.2rem}
.how-card{background:#fff;border:1px solid var(--rule);border-radius:8px;padding:1.2rem}
.how-num{font-family:Georgia,serif;font-size:1.8rem;color:var(--accent);font-weight:600;line-height:1;margin-bottom:.4rem}
.how-card h3{font-family:Georgia,serif;font-size:1.05rem;margin:.2rem 0 .4rem}
.how-card p{margin:0;color:var(--ink-soft);font-size:.92rem}

/* footer */
.footnote{margin-top:3rem;padding-top:1.5rem;border-top:1px solid var(--rule);color:var(--muted);font-size:.85rem}

/* onboarding */
.onboard-shell{max-width:680px;margin:0 auto}
.step-indicator{display:flex;gap:.5rem;margin-bottom:2rem;flex-wrap:wrap}
.step-indicator .step{font-size:.78rem;text-transform:uppercase;letter-spacing:.08em;font-weight:600;color:var(--muted);padding:.3rem .6rem;border-bottom:2px solid var(--rule)}
.step-indicator .step.active{color:var(--accent);border-bottom-color:var(--accent)}
.onboard-step{background:#fff;border:1px solid var(--rule);border-radius:10px;padding:2rem 2rem 1.6rem;box-shadow:var(--shadow)}
.onboard-step h2{margin-top:0}
.onboard-step label{display:block;margin:1.2rem 0 .4rem;font-weight:500;color:var(--ink-soft);font-size:.92rem}
.onboard-step input[type=text],.onboard-step input[type=number],.onboard-step input[type=date]{width:100%;font:inherit;padding:.55rem .8rem;border:1px solid var(--rule);border-radius:6px;background:var(--paper)}
.actions{margin-top:1.5rem;display:flex;justify-content:flex-end;gap:.6rem}

/* rating list */
#rating-list .rating-row{display:flex;justify-content:space-between;align-items:center;padding:.7rem 0;border-bottom:1px solid var(--rule)}
#rating-list .rating-row:last-child{border-bottom:0}
#rating-list .rating-label{font-weight:500}
.stars{display:flex;gap:.3rem}
.stars button{background:transparent;border:0;font-size:1.3rem;color:var(--rule);cursor:pointer;padding:0}
.stars button.active{color:var(--accent)}

/* chips */
.chips-grid{display:flex;flex-wrap:wrap;gap:.5rem;margin-top:1rem}
.chip{background:#fff;border:1px solid var(--rule);border-radius:99px;padding:.5rem 1rem;font-size:.9rem;cursor:pointer;color:var(--ink)}
.chip:hover{border-color:var(--accent)}
.chip.selected{background:var(--accent-soft);border-color:var(--accent);color:var(--accent-strong)}

/* practice */
.practice-shell{max-width:780px;margin:0 auto}
.practice-header{display:flex;justify-content:space-between;align-items:flex-end;padding-bottom:1.2rem;border-bottom:1px solid var(--rule);margin-bottom:1.5rem}
.practice-kc-title{font-family:Georgia,serif;font-size:1.4rem;font-weight:600}
.practice-item{background:#fff;border:1px solid var(--rule);border-radius:10px;padding:1.8rem;box-shadow:var(--shadow)}
.practice-item .stem{font-size:1.1rem;line-height:1.6;margin-bottom:1.4rem}
.choice{display:block;width:100%;text-align:left;background:var(--paper);border:1px solid var(--rule);border-radius:6px;padding:.8rem 1.1rem;margin-bottom:.6rem;cursor:pointer;font:inherit;color:var(--ink);transition:background .1s, border-color .1s}
.choice:hover{border-color:var(--accent)}
.choice.selected{border-color:var(--accent);background:var(--accent-soft)}
.choice.correct{border-color:var(--green);background:var(--green-soft)}
.choice.wrong{border-color:var(--accent);background:var(--accent-soft)}
.choice .label{display:inline-block;font-weight:600;width:1.4em;color:var(--muted)}
.spr-input{font-size:1.1rem;padding:.7rem .9rem;border:1px solid var(--rule);border-radius:6px;background:var(--paper);width:200px}
.confidence-row{margin-top:1.2rem;display:flex;gap:.5rem;align-items:center;font-size:.92rem}
.confidence-row .conf{background:#fff;border:1px solid var(--rule);padding:.35rem .7rem;border-radius:99px;cursor:pointer;font-size:.85rem}
.confidence-row .conf.selected{background:var(--teal-soft);border-color:var(--teal);color:var(--teal)}
.help-row{margin-top:1.4rem;display:flex;justify-content:space-between;align-items:center;gap:.5rem;font-size:.9rem;color:var(--muted)}
.gate-msg{font-size:.85rem;color:var(--muted);margin:.4rem 0 0;font-style:italic}
.are-you-sure{background:var(--warn-soft);border:1px solid #f1dfa0;padding:.8rem 1rem;border-radius:6px;margin-top:1rem;font-size:.92rem}
.practice-feedback{background:#fff;border:1px solid var(--rule);border-radius:10px;padding:1.4rem;margin-top:1rem;box-shadow:var(--shadow)}
.feedback-verdict{font-weight:600;font-size:1.1rem;margin-bottom:.4rem}
.feedback-verdict.correct{color:var(--green)}
.feedback-verdict.wrong{color:var(--accent)}
.feedback-explain{margin:.6rem 0}
.feedback-cause{background:var(--paper-2);padding:.7rem 1rem;border-radius:6px;font-size:.92rem;margin-top:.7rem}
.feedback-cause strong{text-transform:uppercase;letter-spacing:.05em;font-size:.78rem;color:var(--accent)}
.desmos-tip{margin-top:.7rem;background:var(--teal-soft);padding:.7rem 1rem;border-radius:6px;font-size:.92rem;color:var(--ink-soft)}
.desmos-tip strong{color:var(--teal)}
.next-row{margin-top:1.2rem;display:flex;justify-content:flex-end}
.session-footer{margin-top:1.5rem;display:flex;justify-content:space-between;align-items:center}
.hint-list{margin-top:1rem}
.hint-list .hint{background:var(--paper-2);padding:.7rem 1rem;border-radius:6px;font-size:.92rem;margin:.3rem 0;line-height:1.55}
.hint-list .hint .hint-label{font-weight:600;color:var(--accent);text-transform:uppercase;font-size:.75rem;letter-spacing:.05em}

/* why drawer */
.why-drawer{position:fixed;top:0;right:0;bottom:0;width:380px;max-width:100%;background:#fff;border-left:1px solid var(--rule);padding:1.6rem 1.6rem 2rem;box-shadow:-4px 0 20px rgba(26,29,36,.07);overflow-y:auto;z-index:20}
.why-close{position:absolute;top:.8rem;right:1rem;background:transparent;border:0;font-size:1.6rem;cursor:pointer;color:var(--muted);line-height:1}
.why-drawer h3{margin-top:0}
.why-drawer dl{margin:0}
.why-drawer dt{font-weight:600;font-size:.85rem;margin-top:.8rem;color:var(--ink-soft)}
.why-drawer dd{margin:.2rem 0 0;font-size:.92rem;color:var(--ink-soft);line-height:1.55}

/* dashboard */
.dashboard-shell{max-width:1000px;margin:0 auto}
.dash-head{display:flex;justify-content:space-between;align-items:flex-end;padding-bottom:1.5rem;border-bottom:1px solid var(--rule);margin-bottom:2rem;gap:1rem;flex-wrap:wrap}
.dash-row{display:grid;grid-template-columns:repeat(3,1fr);gap:1rem;margin-bottom:2rem}
.dash-card{background:#fff;border:1px solid var(--rule);border-radius:8px;padding:1.2rem}
.dash-card h3{font-family:inherit;font-size:.78rem;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);font-weight:700;margin-top:0;margin-bottom:.5rem}
.dash-mastery,.dash-misconceptions,.dash-history{margin-bottom:2rem}

.mastery-row{padding:.7rem 0;border-bottom:1px solid var(--rule);display:grid;grid-template-columns:1.4fr 2.5fr auto;gap:1rem;align-items:center}
.mastery-row:last-child{border-bottom:0}
.mastery-name{font-weight:500}
.mastery-bar{height:14px;background:var(--paper-2);border-radius:99px;position:relative;overflow:hidden}
.mastery-bar .fill{position:absolute;left:0;top:0;bottom:0;background:var(--accent);border-radius:99px}
.mastery-bar .ci{position:absolute;top:0;bottom:0;background:rgba(177,74,38,.25)}
.mastery-pct{font-variant-numeric:tabular-nums;color:var(--ink-soft);font-size:.9rem;min-width:50px;text-align:right}

.misc-card{background:#fff;border:1px solid var(--rule);border-radius:6px;padding:.9rem 1.1rem;margin-bottom:.6rem;display:grid;grid-template-columns:1fr auto;gap:.5rem;align-items:start}
.misc-card .name{font-weight:500}
.misc-card .wrong-pattern{font-size:.85rem;color:var(--muted);font-family:"SF Mono",Consolas,monospace;margin-top:.25rem}
.misc-card .badge{background:var(--accent-soft);color:var(--accent);padding:.15rem .55rem;border-radius:99px;font-size:.75rem;font-weight:600}
.misc-card .badge.resolved{background:var(--green-soft);color:var(--green)}

.recovery-row{display:flex;gap:.6rem;flex-wrap:wrap}
.dash-recovery{background:#fff;border:1px solid var(--rule);border-radius:8px;padding:1.4rem;margin-bottom:2rem}
.dash-recovery h2{margin-top:0}
.history-row{display:grid;grid-template-columns:auto 1fr auto;gap:1rem;padding:.7rem 0;border-bottom:1px solid var(--rule);font-size:.92rem}
.history-row:last-child{border-bottom:0}
.history-row .date{color:var(--muted);font-variant-numeric:tabular-nums}

#plan-area .plan-block{background:#fff;border:1px solid var(--rule);border-radius:8px;padding:1.2rem;margin-bottom:.8rem}
#plan-area .plan-block h4{font-family:inherit;font-size:.78rem;text-transform:uppercase;letter-spacing:.1em;color:var(--muted);font-weight:700;margin:0 0 .5rem}
#plan-area .plan-arc{font-family:Georgia,serif;font-size:1.05rem;color:var(--ink);margin:0}

.diag-progress{font-size:.85rem;color:var(--muted);margin-bottom:.6rem}

@media (max-width:760px){
  .dash-row{grid-template-columns:1fr}
  .mastery-row{grid-template-columns:1fr;gap:.3rem}
  .mastery-name{font-weight:600}
  .practice-header{flex-direction:column;align-items:flex-start;gap:.6rem}
  .why-drawer{width:100%}
}