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20px}.filter-fields{gap:12px}.filter-card .pills{flex-wrap:wrap;margin-inline:0;padding:0;overflow:visible}.filter-card .select-wrap select{padding:0 32px 0 14px;font-size:.88rem}}.step-figure{background:var(--color-bg);border:1px solid var(--color-border);border-radius:var(--radius-md);margin:0 0 20px;padding:14px 16px 12px}.step-figure svg{width:100%;max-width:440px;height:auto;margin:0 auto;display:block}.step-figure figcaption{text-align:center;color:var(--color-text-light);margin-top:8px;font-size:.9rem;line-height:1.5}.intro-art-card{aspect-ratio:16/9;border-radius:16px;overflow:hidden}.intro-art-card svg,.intro-art-card img{object-fit:cover;width:100%;height:100%;max-height:none;display:block}.intro-art.intro-art-scene{aspect-ratio:16/10;background:0 0;border-radius:96px 96px 28px 28px;padding:0;overflow:hidden}.intro-art.intro-art-scene svg,.intro-art.intro-art-scene img{object-fit:cover;width:100%;height:100%;max-height:none;display:block}@media (width>=960px){.intro-art.intro-art-scene{border-radius:120px 120px 32px 32px;max-width:400px}}:root{--color-water:#4f8197;--color-water-soft:#e4eff2}.guide-water{grid-template-columns:minmax(0,1fr)}@media (width>=960px){.guide-water{grid-template-columns:minmax(0,680px);justify-content:start}}.water-card .step-title{outline:none}.water-card .step-title em{font-family:var(--font-serif);color:var(--color-accent);font-weight:400}.stepper{flex-wrap:wrap;justify-content:flex-end;align-items:center;gap:5px;list-style:none;display:flex}.stepper li{border:1px solid var(--color-border);background:var(--color-tint);width:26px;height:26px;color:var(--color-text-light);border-radius:50%;justify-content:center;align-items:center;font-size:.75rem;font-weight:600;display:inline-flex}.stepper li.is-done{background:var(--color-sage);border-color:var(--color-sage-mid);color:var(--color-ink)}.stepper li.is-current{background:var(--color-primary);border-color:var(--color-primary);color:#fff;box-shadow:0 0 0 3px var(--color-sage)}.water-card .step-head{margin-bottom:22px}@media (width<=539px){.water-card .step-head{flex-direction:column;align-items:flex-start;gap:10px}.stepper{flex-wrap:nowrap;justify-content:flex-start}}.stage-label{letter-spacing:.18em;text-transform:uppercase;color:var(--color-water);margin-bottom:6px;font-size:.72rem;font-weight:700}.hint-spaced{margin-bottom:20px}.practical-note{border-radius:var(--radius-md);background:var(--color-water-soft);color:var(--color-ink);margin-top:16px;padding:14px 16px;font-size:.95rem;line-height:1.6}.recap{color:var(--color-text-light);margin-bottom:14px;font-size:1rem}.recap strong{color:var(--color-ink);font-weight:600}.predict{margin-bottom:14px}.predict-options{grid-template-columns:repeat(3,minmax(0,1fr));gap:8px;margin-top:8px;display:grid}.predict-btn{border-radius:var(--radius-md);border:1.5px solid var(--color-border);background:var(--color-surface);min-height:56px;color:var(--color-ink);padding:0 8px;font-size:1rem;font-weight:600;transition:background .15s,border-color .15s,color .15s}.predict-btn:hover{border-color:var(--color-water)}.predict-btn.active{background:var(--color-water-soft);border-color:var(--color-water);color:var(--color-ink);box-shadow:inset 0 0 0 1px var(--color-water)}.predict-btn:focus-visible{outline:3px solid var(--color-sun);outline-offset:2px}.predict-note{min-height:1.6em;color:var(--color-text-light);font-family:var(--font-serif);margin-top:10px;font-style:italic}.reveal:empty{display:none}.reveal{border-radius:var(--radius-md);background:var(--color-water-soft);margin:14px 0;padding:18px 20px}.reveal .say-label{color:var(--color-water)}.reveal-text{color:var(--color-ink);font-size:1.1rem;line-height:1.65}.pace-note{font-family:var(--font-serif);color:var(--color-text-light);margin:16px 0 6px;font-size:1rem;font-style:italic}.stage-tools{justify-content:flex-start;margin-top:10px;display:flex}.step-nav.stack{grid-template-columns:1fr}.quiet{z-index:100;padding:32px var(--gutter) calc(32px + env(safe-area-inset-bottom));background:var(--color-bg);text-align:center;flex-direction:column;justify-content:center;align-items:center;gap:40px;display:flex;position:fixed;inset:0}.quiet-phrase{max-width:28ch;font-family:var(--font-serif);color:var(--color-ink);text-wrap:balance;font-size:clamp(1.7rem,7vw,2.6rem);font-style:italic;line-height:1.35}.quiet .btn{min-width:220px}.guide-message{--color-water:#b5573a;--color-water-soft:#f8e6dc}.guide-message .eyebrow{color:var(--color-water)}.guide-message .stepper li.is-current{box-shadow:0 0 0 3px var(--color-water-soft)}.choices{flex-direction:column;gap:10px;margin:18px 0 14px;display:flex}.choices .say-label{margin-bottom:0}.choice-card{text-align:left;border-radius:var(--radius-md);border:1.5px solid var(--color-border);background:var(--color-surface);width:100%;min-height:56px;color:var(--color-ink);flex-direction:column;align-items:flex-start;gap:4px;padding:14px 16px;transition:background .15s,border-color .15s;display:flex}.choice-card:hover{border-color:var(--color-water)}.choice-card.active{background:var(--color-water-soft);border-color:var(--color-water);box-shadow:inset 0 0 0 1px var(--color-water)}.choice-card:focus-visible{outline:3px solid var(--color-sun);outline-offset:2px}.choice-title{font-size:1.05rem;font-weight:700}.choice-text{color:var(--color-text-light);font-size:.95rem;line-height:1.5}.choice-example{font-family:var(--font-serif);color:var(--color-ink);font-size:1.05rem;font-style:italic;line-height:1.45}.prompt-list{font-family:var(--font-serif);color:var(--color-ink);flex-direction:column;gap:8px;padding:0 0 16px;font-size:1.1rem;font-style:italic;list-style:none;display:flex}.read-box{padding-bottom:16px}.read-box>p:last-child{color:var(--color-text-light);font-size:.95rem;line-height:1.6}.read-card{border-radius:var(--radius-md);background:var(--color-surface);border:1px solid var(--color-border);text-align:center;color:var(--color-ink);margin:4px 0 12px;padding:22px 18px;font-size:1.5rem;font-weight:600;line-height:1.3}.read-nav{gap:8px;margin-bottom:12px;display:flex}.read-nav .btn:disabled{opacity:.45;cursor:default}.detail-tabs{margin:-4px 0 22px}.pills a.pill{align-items:center;display:inline-flex}.pills a.pill.active:hover{border-color:#2f5e4c}.guide-lego{--color-water:#3f6db0;--color-water-soft:#e3ecf7}.lego-svg{width:100%;height:auto;display:block}.lego-frame{border:1px solid var(--color-border);background:#f1eada;border-radius:16px;max-width:300px;margin:14px auto;padding:14px}.lego-frame-small{max-width:230px}.lego-model{flex-direction:column;align-items:flex-start;gap:6px;margin-bottom:14px;display:flex}.lego-model .lego-frame{width:100%;margin-left:0}.lego-turn{aspect-ratio:1;border:1px solid var(--color-border);background:#f1eada;border-radius:16px;width:min(100%,300px);margin:14px auto;position:relative}.lego-rot{aspect-ratio:3/2;width:88%;transition:transform .7s;position:absolute;top:50%;left:6%;transform:translateY(-50%)rotate(0)}.lego-rot.is-rotated{transform:translateY(-50%)rotate(90deg)}.lego-done{max-width:260px;margin:0 auto 14px}.lego-level{background:var(--color-tint);color:var(--color-ink);border-radius:999px;gap:6px;padding:8px 14px;font-size:.95rem;display:inline-flex}.lego-ask{margin-top:16px}.lego-chips{justify-content:flex-start;margin-bottom:8px}.reveal-steps{flex-direction:column;gap:10px;display:flex}.equation-big{letter-spacing:-.02em;color:var(--color-ink);text-align:center;font-variant-numeric:tabular-nums;margin:4px 0 8px;font-size:2rem;font-weight:800}.equations{grid-template-columns:minmax(0,1fr) auto minmax(0,1fr);align-items:center;gap:6px;margin:14px 0 10px;display:grid}.equation{border:1px solid var(--color-border);border-radius:var(--radius-md);background:var(--color-surface);color:var(--color-ink);text-align:center;font-variant-numeric:tabular-nums;white-space:nowrap;margin:0;padding:16px 4px;font-size:clamp(1.05rem,4.8vw,1.6rem);font-weight:700}.equations-link{color:var(--color-text-light);font-size:1.2rem}.factor{border-radius:8px;min-width:1.3em;padding:0 3px;transition:background .3s;display:inline-block}.f-blue{color:#2f5f9e}.f-coral{color:#b5573a}.equation.is-lit .f-blue{background:#dde8f5}.equation.is-lit .f-coral{background:#f8e6dc}.answer-form{margin:14px 0 6px}.answer-row{gap:8px;margin-top:6px;display:flex}.answer-input{border:1.5px solid var(--color-border);border-radius:var(--radius-md);min-width:0;min-height:52px;color:var(--color-ink);background:#fff;flex:1;padding:0 16px;font-size:1.25rem;font-weight:600}.answer-input:focus-visible{outline:3px solid var(--color-sun);outline-offset:2px}.hint-box{flex-direction:column;align-items:flex-start;gap:8px;margin:4px 0 14px;display:flex}.hint-line{background:var(--color-water-soft);color:var(--color-ink);border-radius:12px;margin:0;padding:10px 14px;font-size:1rem;line-height:1.55}.help-list{padding-bottom:16px}.help-list dt{letter-spacing:.16em;text-transform:uppercase;color:var(--color-water);margin-top:12px;font-size:.72rem;font-weight:700}.help-list dt:first-child{margin-top:0}.help-list dd{color:var(--color-ink);margin:3px 0 0;font-size:.97rem;line-height:1.6}.hint-inner{background:#ffffffb3;margin-top:12px}@media (prefers-reduced-motion:no-preference){@keyframes lego-hop{0%,to{transform:translateY(0)}40%{transform:translateY(-5px)}}@keyframes lego-pop{0%{opacity:0;transform:scale(.96)}to{opacity:1;transform:scale(1)}}.lego-row.pulse{animation:.7s both lego-hop}.celebrate{animation:.45s both lego-pop}}.btn-block+.btn-quiet,.guide-lego .hint{margin-top:10px}