:root{--primary: #c94c00;--primary-deep: #a03b00;--primary-fixed: #ffdbcd;--on-primary: #ffffff;--bg: #fff8f6;--surface-lowest: #ffffff;--surface-low: #fbf2ef;--surface: #f5ece9;--surface-high: #efe6e3;--fg-1: #1e1b19;--fg-2: #594138;--fg-muted: #8d7166;--cat-nature: #10b981;--cat-history: #c94c00;--cat-life: #3b82f6;--cat-science: #7b6a3f;--cat-nature-bg: #e7f7f0;--cat-history-bg: #fff0e8;--cat-life-bg: #e8f1fd;--border: rgba(30, 27, 25, .07);--border-strong: rgba(30, 27, 25, .14);--font-headline: "ZCOOL XiaoWei", "Space Grotesk", serif;--font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;--sp-2: 8px;--sp-3: 12px;--sp-4: 16px;--sp-5: 20px;--sp-6: 24px;--sp-8: 32px;--sp-12: 48px;--r-sm: 8px;--r-md: 12px;--r-lg: 16px;--r-xl: 20px;--r-2xl: 28px;--r-pill: 9999px;--shadow-sm: 0 1px 2px rgba(30, 27, 25, .05);--shadow-md: 0 4px 14px rgba(30, 27, 25, .07);--shadow-lg: 0 10px 30px rgba(30, 27, 25, .1);--shadow-accent: 0 8px 24px rgba(201, 76, 0, .16);font-family:var(--font-body);color:var(--fg-1);background:var(--bg);line-height:1.6;font-size:15.5px;color-scheme:light}*{box-sizing:border-box}html{-webkit-text-size-adjust:100%}html,body,#root{min-height:100%}@font-face{font-family:Noto Sans SC;font-style:normal;font-weight:400;font-display:swap;src:url(/fonts/noto-sans-sc-400.woff2) format("woff2")}@font-face{font-family:Noto Sans SC;font-style:normal;font-weight:500;font-display:swap;src:url(/fonts/noto-sans-sc-500.woff2) format("woff2")}@font-face{font-family:Noto Sans SC;font-style:normal;font-weight:700;font-display:swap;src:url(/fonts/noto-sans-sc-700.woff2) format("woff2")}@font-face{font-family:Noto Sans SC;font-style:normal;font-weight:900;font-display:swap;src:url(/fonts/noto-sans-sc-900.woff2) format("woff2")}@font-face{font-family:ZCOOL XiaoWei;font-style:normal;font-weight:400;font-display:swap;src:url(/fonts/zcool-xiaowei-400.woff2) format("woff2")}body{margin:0;background:radial-gradient(ellipse 90% 50% at 85% -5%,rgba(201,76,0,.06),transparent),radial-gradient(ellipse 70% 40% at 5% 8%,rgba(75,64,224,.05),transparent),var(--bg);-webkit-tap-highlight-color:transparent}button,input,select{font:inherit;color:inherit}button{cursor:pointer;touch-action:manipulation}img{max-width:100%;display:block}:focus-visible{outline:3px solid rgba(201,76,0,.55);outline-offset:2px;border-radius:var(--r-sm)}.page{width:min(1120px,calc(100% - 32px));margin:0 auto;padding:20px 0 80px}.top{display:flex;justify-content:space-between;align-items:center;margin-bottom:var(--sp-8)}.brand{display:inline-flex;gap:10px;align-items:center;border:0;background:none;font-family:var(--font-headline);font-size:25px;padding:6px 10px;margin-left:-10px;border-radius:var(--r-md)}.mark{width:22px;height:22px;border-radius:8px;background:conic-gradient(from 140deg,#c94c00,#f59e0b,#10b981,#3b82f6,#7b40e0,#c94c00);box-shadow:0 2px 8px #c94c0040}.hero{position:relative;padding:var(--sp-12) var(--sp-12) var(--sp-10);background:linear-gradient(155deg,#fff,#fff3ec 55%,#ffe8d9);border:1px solid var(--border);border-radius:var(--r-2xl);overflow:hidden;box-shadow:var(--shadow-lg)}.hero-inner{position:relative;z-index:2;max-width:600px}.hero-art{position:absolute;right:-2%;bottom:-4%;width:56%;max-width:500px;height:auto;pointer-events:none}.hero h1,.answer h1{font-family:var(--font-headline);font-size:clamp(38px,6.4vw,62px);line-height:1.1;letter-spacing:-.01em;margin:var(--sp-3) 0 var(--sp-4);font-weight:400;text-wrap:balance}.hero h1 em{font-style:normal;background:linear-gradient(120deg,#c94c00,#e85d1f);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}.eyebrow{display:inline-flex;align-items:center;gap:8px;color:var(--primary-deep);font-size:13px;font-weight:700;margin:0;padding:5px 12px;background:var(--primary-fixed);border-radius:var(--r-pill)}.eyebrow:before{content:"";width:7px;height:7px;border-radius:50%;background:var(--primary)}.lead,.muted{color:var(--fg-2);max-width:38em}.lead{font-size:16.5px;margin:0 0 var(--sp-2);line-height:1.7}.muted{font-size:14px}.askbar{display:grid;grid-template-columns:1fr auto auto;gap:6px;margin:var(--sp-6) 0 var(--sp-4);padding:7px;background:var(--surface-lowest);border:1.5px solid var(--border-strong);border-radius:var(--r-xl);box-shadow:var(--shadow-lg);transition:border-color .2s ease,box-shadow .2s ease}.askbar:focus-within{border-color:var(--primary);box-shadow:0 0 0 4px #c94c001f,var(--shadow-lg)}.askbar input{border:0;background:none;outline:none;padding:12px 16px;font-size:17px;min-width:0}.askbar input::placeholder{color:var(--fg-muted)}.askbar input:focus-visible{outline:2px solid rgba(201,76,0,.45);outline-offset:-2px;border-radius:var(--r-md)}.ask-btn,.icon-btn,.filters button,.chips button,.examples button{border:0;border-radius:var(--r-pill);transition:background .16s ease,color .16s ease,border-color .16s ease,transform .12s ease,box-shadow .16s ease}.ask-btn{background:linear-gradient(135deg,#c94c00,#e85d1f);color:var(--on-primary);padding:12px 26px;font-weight:700;box-shadow:var(--shadow-accent)}.ask-btn:hover:not(:disabled){background:linear-gradient(135deg,#a03b00,#c94c00);transform:translateY(-1px)}.ask-btn:active:not(:disabled){transform:translateY(1px)}.ask-btn:disabled{opacity:.5;cursor:default;box-shadow:none}.top-actions{display:flex;align-items:center;gap:10px}.ready-tag{font-size:12px;font-weight:700;padding:5px 12px;border-radius:var(--r-pill);background:#e7f7f0;color:#0a7d5c}.icon-btn{min-width:76px;padding:12px 16px;background:var(--surface);font-weight:600;color:var(--fg-2)}.icon-btn:hover{background:var(--primary-fixed);color:var(--primary-deep)}.icon-btn.on{background:linear-gradient(135deg,#c94c00,#e85d1f);color:#fff;box-shadow:var(--shadow-accent)}.examples,.chips,.filters{display:flex;flex-wrap:wrap;gap:8px}.examples button,.chips button{background:#ffffffbf;border:1px solid var(--border-strong);padding:8px 15px;color:var(--fg-2);font-size:14px}.examples button:hover,.chips button:hover{border-color:var(--primary);color:var(--primary-deep);background:var(--primary-fixed);transform:translateY(-1px)}.catalog{margin-top:var(--sp-12)}.catalog-head{display:flex;align-items:baseline;gap:14px;margin:0 0 var(--sp-5)}.catalog-head h2{font-family:var(--font-headline);font-size:27px;font-weight:400;margin:0}.catalog-head p{margin:0;color:var(--fg-muted);font-size:14px}.filters{margin-bottom:var(--sp-5)}.filters button{background:transparent;padding:8px 18px;color:var(--fg-muted);font-weight:600;font-size:14px}.filters button:hover{background:var(--primary-fixed);color:var(--primary-deep)}.filters button.on{background:var(--fg-1);color:#fff8f6}.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:var(--sp-4)}.recent{margin-top:var(--sp-10)}.recent-row{display:flex;flex-wrap:wrap;gap:8px}.recent-row button{border:1px solid var(--border-strong);border-radius:var(--r-pill);background:var(--surface-lowest);padding:8px 15px;color:var(--fg-2);font-size:14px;transition:background .15s ease,border-color .15s ease}.recent-row button:hover{background:var(--primary-fixed);border-color:var(--primary);color:var(--primary-deep)}.trails-section{margin-top:var(--sp-12)}.trail-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:var(--sp-4)}.trail-card{background:var(--surface-lowest);border:1px solid var(--border);border-radius:var(--r-xl);overflow:hidden;box-shadow:var(--shadow-sm)}.trail-head{width:100%;display:flex;align-items:center;gap:12px;border:0;background:none;text-align:left;padding:var(--sp-4) var(--sp-5)}.trail-head:hover{background:var(--surface-low)}.trail-icon{width:44px;height:44px;border-radius:var(--r-md);display:grid;place-items:center;background:var(--primary-fixed);color:var(--primary-deep);flex:0 0 44px}.trail-text{flex:1;display:grid;gap:2px}.trail-text strong{font-family:var(--font-headline);font-size:19px;font-weight:400}.trail-text em{font-style:normal;color:var(--fg-muted);font-size:13px}.trail-progress{font-weight:700;font-size:13px;color:var(--primary-deep);background:var(--primary-fixed);padding:4px 12px;border-radius:var(--r-pill)}.trail-items{display:grid;gap:6px;padding:0 var(--sp-5) var(--sp-5)}.trail-items button{border:1px solid var(--border);border-radius:var(--r-md);background:var(--surface-low);padding:10px 14px;text-align:left;font-size:14.5px;color:var(--fg-2);transition:background .14s ease,border-color .14s ease}.trail-items button:hover{background:var(--primary-fixed);border-color:var(--primary)}.trail-items button.done{background:#e7f7f0;border-color:#10b98159;color:#0a7d5c}.quiz{background:var(--surface-lowest);border:1px solid var(--border);border-radius:var(--r-xl);padding:var(--sp-5) var(--sp-6);box-shadow:var(--shadow-sm)}.quiz h2{font-size:12.5px;font-weight:700;letter-spacing:.06em;color:var(--fg-muted);margin:0 0 10px;text-transform:uppercase}.quiz-q{font-family:var(--font-headline);font-size:22px;margin:0 0 var(--sp-4)}.quiz-opts{display:grid;gap:8px}.quiz-opts button{border:1px solid var(--border-strong);border-radius:var(--r-md);background:var(--surface-low);padding:12px 16px;text-align:left;font-size:14.5px;line-height:1.55;color:var(--fg-2);transition:background .14s ease,border-color .14s ease}.quiz-opts button:hover:not(:disabled){background:var(--primary-fixed);border-color:var(--primary)}.quiz-opts button.right{background:#e7f7f0;border-color:#10b981;color:#0a7d5c;font-weight:600}.quiz-opts button.wrong{background:#fdecea;border-color:#c94c0066;color:var(--primary-deep)}.quiz-result{margin:var(--sp-3) 0 0;font-weight:600;color:var(--primary-deep)}.topic-card{position:relative;text-align:left;background:var(--surface-lowest);border:1px solid var(--border);border-radius:var(--r-xl);min-height:216px;box-shadow:var(--shadow-sm);overflow:hidden;transition:transform .18s ease,box-shadow .18s ease,border-color .18s ease}.topic-card:before{content:"";position:absolute;top:0;left:0;right:0;height:4px;background:var(--cat, var(--cat-nature))}.topic-card.cat-nature{--cat: var(--cat-nature)}.topic-card.cat-history{--cat: var(--cat-history)}.topic-card.cat-life{--cat: var(--cat-life)}.topic-card.cat-science{--cat: var(--cat-science)}.topic-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);border-color:var(--border-strong)}.card-main{width:100%;border:0;background:none;text-align:left;padding:var(--sp-6) var(--sp-5) var(--sp-6);min-height:216px;display:flex;flex-direction:column;gap:9px}.card-speak{position:absolute;top:var(--sp-4);right:var(--sp-4);border:0;border-radius:var(--r-pill);padding:6px 13px;background:var(--surface);font-weight:700;font-size:13px;transition:background .15s ease,transform .12s ease}.card-speak:hover{background:var(--primary-fixed);transform:scale(1.05)}.topic-card strong{font-family:var(--font-headline);font-size:24px;line-height:1.28;font-weight:400}.topic-card em{font-style:normal;color:var(--fg-2);font-size:13.5px;line-height:1.65;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}.card-cat{display:inline-flex;align-self:flex-start;font-size:11.5px;font-weight:700;padding:3px 10px;border-radius:var(--r-pill);background:var(--cat-bg, var(--cat-nature-bg));color:var(--cat, var(--cat-nature))}.cat-nature .card-cat{--cat-bg: var(--cat-nature-bg)}.cat-history .card-cat{--cat-bg: var(--cat-history-bg)}.cat-life .card-cat{--cat-bg: var(--cat-life-bg)}.cat-science .card-cat{--cat-bg: #f4eedc}.card-motif{width:46px;height:46px;border-radius:var(--r-md);display:grid;place-items:center;background:var(--cat-bg, var(--cat-nature-bg));color:var(--cat, var(--cat-nature))}.card-art{display:block;margin:calc(-1 * var(--sp-6)) calc(-1 * var(--sp-5)) 6px}.topic-art{display:block}.topic-art svg{width:100%;height:auto;display:block}.topic-art-image{display:block;width:100%;aspect-ratio:3 / 2;object-fit:cover;object-position:center}.motif{width:25px;height:25px}.answer{max-width:780px;margin:0 auto}.back,.text-btn{border:0;background:none;padding:5px 0;color:var(--primary-deep);font-weight:700}.back:hover,.text-btn:hover{color:var(--primary);text-decoration:underline}.pill{display:inline-flex;align-items:center;margin:var(--sp-5) 0 0;font-size:13px;font-weight:700;padding:5px 14px;border-radius:var(--r-pill);background:#e7f7f0;color:#0a7d5c}.pill.cat-history{background:var(--cat-history-bg);color:var(--cat-history)}.pill.cat-life{background:var(--cat-life-bg);color:var(--cat-life)}.pill.cat-science{background:#f4eedc;color:var(--cat-science)}.block{margin:var(--sp-8) 0}.block h2{font-size:12.5px;font-weight:700;letter-spacing:.06em;color:var(--fg-muted);margin:0 0 10px;text-transform:uppercase}.one-liner{font-family:var(--font-headline);font-size:29px;line-height:1.4;margin:0;text-wrap:balance}.speak-bar{margin:var(--sp-4) 0 var(--sp-2);display:flex;align-items:center;gap:14px;flex-wrap:wrap}.speak-btn{border:0;border-radius:var(--r-pill);padding:13px 24px;background:linear-gradient(135deg,#c94c00,#e85d1f);color:#fff;font-size:16px;font-weight:700;box-shadow:var(--shadow-accent);transition:background .16s ease,transform .12s ease}.speak-btn:hover{transform:translateY(-1px)}.speak-btn:active{transform:translateY(1px)}.speak-btn.on{background:var(--fg-1);box-shadow:none}.point-read-btn{border:1px solid var(--border);border-radius:var(--r-pill);padding:11px 18px;background:var(--surface-lowest);color:var(--fg-1);font-size:15px;font-weight:700;transition:background .16s ease,border-color .16s ease,color .16s ease}.point-read-btn:hover{border-color:var(--primary);color:var(--primary-deep)}.point-read-btn.on{background:var(--primary-fixed);border-color:var(--primary);color:var(--primary-deep)}.speak-bar p{margin:0;color:var(--fg-muted);font-size:13.5px}.ruby{display:flex;flex-wrap:wrap;align-items:flex-end;gap:.2em .3em;margin:0;line-height:1.25}.ruby-lg .ruby-unit b{font-size:37px}.ruby-unit{border:0;background:none;padding:4px 3px;display:flex;flex-direction:column;align-items:center;min-width:1.7em;border-radius:var(--r-sm);transition:background .12s ease}.ruby-unit:not(.ruby-unit-static):hover{background:var(--primary-fixed)}.ruby-unit:not(.ruby-unit-static):hover b{color:var(--primary-deep)}.ruby-unit small{font-size:11px;color:var(--primary-deep);line-height:1;font-weight:600}.ruby-unit b{font-size:28px;font-weight:500;font-family:var(--font-headline)}.ruby-unit:active{color:var(--primary)}.ruby-unit-static{cursor:text}.ruby-space{font-size:28px;padding:0 2px}.word-row{display:flex;flex-wrap:wrap;gap:10px}.word-card{width:86px;height:98px;border:1px solid var(--border);border-radius:var(--r-lg);background:var(--surface-lowest);display:flex;flex-direction:column;align-items:center;justify-content:center;gap:4px;box-shadow:var(--shadow-sm);transition:transform .14s ease,box-shadow .14s ease}.word-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-md)}.word-card small{color:var(--primary-deep);font-size:13px;font-weight:600}.word-card b{font-family:var(--font-headline);font-size:37px;font-weight:400}.modal .check{display:flex;align-items:center;gap:8px}.test-ok{color:#0a7d5c;margin:0;font-size:14px}.test-bad{color:var(--primary-deep);margin:0;font-size:14px}.parent-tip{background:linear-gradient(135deg,#fff7ea,#ffefd9);border-left:4px solid #f59e0b;border-radius:var(--r-md);padding:var(--sp-4) var(--sp-5)}.parent-tip strong{display:block;margin-bottom:4px;color:#92600a}.parent-tip p{margin:0}.stage{margin:var(--sp-6) 0 var(--sp-2);background:var(--surface-lowest);border-radius:var(--r-xl);overflow:hidden;border:1px solid var(--border);box-shadow:var(--shadow-md)}.stage-label{padding:var(--sp-4) var(--sp-5) 0;font-size:12.5px;font-weight:700;letter-spacing:.05em;color:var(--fg-muted);text-transform:uppercase}.viz{position:relative;min-height:280px}.viz-3d{height:390px}.viz-caption{position:absolute;left:14px;right:14px;bottom:14px;z-index:2;background:#fffffff2;border:1px solid var(--border);border-radius:var(--r-lg);padding:var(--sp-3) var(--sp-4);box-shadow:var(--shadow-md);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px)}.viz-caption p{margin:0 0 10px;font-size:14px}.viz-caption input[type=range]{width:100%;accent-color:var(--primary);cursor:pointer}.universe-viz{background-color:#06162d;background-position:center;background-size:cover}.universe-viz canvas{background:transparent;cursor:grab}.universe-viz canvas:active{cursor:grabbing}.universe-caption{background:#fffdf8f5}.universe-actions{display:flex;flex-wrap:wrap;gap:8px}.universe-actions button{min-height:36px;border:1px solid var(--border);border-radius:var(--r-pill);padding:7px 13px;background:var(--surface-lowest);color:var(--fg-1);font-size:13px;font-weight:700}.universe-actions button:hover,.universe-actions button.on{border-color:var(--primary);background:var(--primary-fixed);color:var(--primary-deep)}.volcano-viz{min-height:390px;background-color:#3f6672;background-position:center;background-size:cover;overflow:hidden}.volcano-caption{background:#fffdf8f5}.volcano-motion{position:absolute;top:0;right:0;bottom:0;left:0;overflow:hidden;pointer-events:none}.volcano-magma-glow{position:absolute;left:50%;bottom:15%;width:18%;height:26%;transform:translate(-50%);border-radius:50%;background:radial-gradient(ellipse,rgba(255,225,119,.76),rgba(255,102,30,.28) 42%,transparent 70%);opacity:.42}.volcano-magma-stream{position:absolute;left:50%;bottom:29%;width:11px;height:39%;transform:translate(-50%);border-radius:999px;background:linear-gradient(to top,#ff540f29,#ffd155e6,#ff5e141a);box-shadow:0 0 16px #ff7422c7;opacity:.15}.volcano-bubble{position:absolute;left:var(--x);bottom:23%;width:8px;height:8px;border:1.5px solid rgba(255,239,171,.9);border-radius:50%;background:#ff82238c;opacity:0}.volcano-ember{position:absolute;left:var(--x);top:23%;width:5px;height:5px;border-radius:50%;background:#ffe29a;box-shadow:0 0 8px #ff992eeb;opacity:0}.phase-magma .volcano-magma-glow{animation:magma-pulse 2.5s ease-in-out infinite}.phase-pressure .volcano-magma-glow{opacity:.65;animation:magma-pulse 1.6s ease-in-out infinite}.phase-pressure .volcano-bubble{animation:bubble-rise 2.1s ease-in infinite;animation-delay:calc(var(--i) * -.32s)}.phase-crack .volcano-magma-glow{opacity:.82;animation:magma-pulse .9s ease-in-out infinite}.phase-crack .volcano-magma-stream{opacity:.94;animation:magma-rush 1.15s ease-in-out infinite}.phase-crack .volcano-bubble{animation:bubble-rise 1.2s ease-in infinite;animation-delay:calc(var(--i) * -.18s)}.phase-crack .volcano-ember{animation:ember-burst 1.25s ease-out infinite;animation-delay:calc(var(--i) * -.12s)}.phase-cool .volcano-magma-glow{opacity:.18}.phase-cool .volcano-magma-stream{opacity:.22;background:linear-gradient(to top,rgba(98,60,38,.5),rgba(255,111,36,.28),transparent)}.volcano-actions{display:flex;flex-wrap:wrap;gap:8px}.volcano-actions button{min-height:44px;border:1px solid var(--border);border-radius:var(--r-pill);padding:7px 13px;background:var(--surface-lowest);color:var(--fg-1);font-size:13px;font-weight:700}.volcano-actions button:hover,.volcano-actions button.on{border-color:#c94c00;background:#fff0e5;color:#9a3800}.tides-viz{min-height:390px;background-color:#101e3b;background-position:center;background-size:cover;overflow:hidden}.tides-caption{background:#fffdf8f5}.tides-motion{position:absolute;top:0;right:0;bottom:0;left:0;overflow:hidden;pointer-events:none}.tide-orbit-glow{position:absolute;top:13%;right:10%;width:12%;aspect-ratio:1;border-radius:50%;background:#ffe39d66;box-shadow:0 0 28px #ffd36ab3;opacity:.22}.tide-water-pulse{position:absolute;left:12%;top:48%;width:76%;height:24%;border-radius:50%;border:2px solid rgba(120,231,235,.48);box-shadow:0 0 24px #3dc4d566;opacity:.15}.tide-state-pull .tide-orbit-glow{animation:tide-orbit-pulse 2.8s ease-in-out infinite}.tide-state-bulge .tide-water-pulse{opacity:.62;animation:tide-swell 2.2s ease-in-out infinite}.tide-state-turn .tide-orbit-glow{opacity:.6;animation:tide-orbit-pulse 1.9s ease-in-out infinite}.tide-state-turn .tide-water-pulse{opacity:.5;animation:tide-swell 1.5s ease-in-out infinite}.tides-actions{display:flex;flex-wrap:wrap;gap:8px}.tides-actions button{min-height:44px;border:1px solid var(--border);border-radius:var(--r-pill);padding:7px 13px;background:var(--surface-lowest);color:var(--fg-1);font-size:13px;font-weight:700}.tides-actions button:hover,.tides-actions button.on{border-color:#3d8fa1;background:#e6f7f5;color:#17616d}.viz-toggle,.step-dots button{border:0;border-radius:var(--r-pill);padding:8px 16px;background:var(--fg-1);color:#fff8f6;font-weight:600;font-size:14px}.viz-toggle:hover{background:#3a342e}.step-dots{display:flex;gap:8px}.step-dots button{width:36px;padding:8px 0;background:var(--surface);color:var(--fg-1)}.step-dots button:hover{background:var(--primary-fixed)}.step-dots button.on{background:var(--fg-1);color:#fff8f6}.viz-sky{height:340px;background:linear-gradient(#5ea0c8,#f0d7a4);overflow:hidden}.viz-sky.no-air{background:#0d0c0b}.sky-sun{position:absolute;left:28px;top:28px;width:70px;height:70px;border-radius:50%;background:#ffd36a;box-shadow:0 0 44px #ffd36a}.sky-beam{position:absolute;left:90px;top:56px;width:46%;height:16px;background:linear-gradient(90deg,#fff6d0,transparent);transform:rotate(12deg)}.spark{position:absolute;left:38%;top:30%;width:10px;height:10px;border-radius:50%;background:#7eb6e0;animation:float 2.8s ease-in-out infinite;animation-delay:calc(var(--i) * .08s);transform:translate(calc(var(--i) * 14px),calc(var(--i) * 8px))}.sky-ground{position:absolute;left:0;right:0;bottom:0;padding:16px;color:var(--ink, var(--fg-1))}.viz-sky.no-air .sky-ground{color:#fff8f6}.viz-sky .viz-toggle{position:absolute;right:14px;bottom:14px}.wiki-figure img{width:100%;height:320px;object-fit:cover}.wiki-figure figcaption{padding:8px 16px 16px;color:var(--fg-muted);font-size:12px}.plates{display:grid;grid-template-columns:1fr 1fr;gap:10px;padding:var(--sp-3) var(--sp-4) var(--sp-5)}.plates figure{margin:0}.plates .plate svg{width:100%;height:140px;display:block;border-radius:var(--r-lg)}.plates .plate-image{width:100%;height:140px;display:block;border-radius:var(--r-lg);object-fit:cover}.plates figcaption{padding:8px 4px 0;color:var(--fg-muted);font-size:12px}.plates-single{grid-template-columns:minmax(0,1fr)}.stage-plain{min-height:160px;display:grid;place-items:center;padding:var(--sp-6);gap:8px}.plain-line{font-family:var(--font-headline);font-size:28px;text-align:center}.plain-motif{width:64px;height:64px;display:grid;place-items:center;color:var(--primary)}.plain-motif .motif{width:40px;height:40px}.cycle-svg,.rainbow-svg{width:100%;height:auto;display:block}.vapor{opacity:.2}.step-1 .vapor,.step-0 .vapor{opacity:.9;animation:rise 2s infinite}.drop{opacity:0}.step-2 .drop{opacity:1;animation:fall 1.1s infinite;animation-delay:calc(var(--i) * .08s)}.heart-shape{transform-origin:320px 140px;animation:beat 1.2s ease-in-out infinite}.ice-block{animation:bob 2.4s ease-in-out infinite}.falling{animation:drift 4s linear infinite}.air{stroke-dasharray:8 10;animation:dash 1.6s linear infinite}.bolt{animation:flash 1.6s ease-in-out infinite;transform-origin:320px 120px}.grain{animation:bob 2s ease-in-out infinite;animation-delay:calc(var(--i) * .08s)}.scope-list{padding-left:18px}.answer .ask-btn{margin:var(--sp-4) 0 var(--sp-6)}.loading-card h1{margin-top:8px}.chart{padding:8px 20px 22px}.chart h3{font-family:var(--font-headline);font-size:24px;font-weight:400;margin:0 0 14px}.chart-flow{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;align-items:stretch;gap:8px}.chart-flow li{display:flex;align-items:center;gap:8px;flex:1 1 140px}.flow-arrow{width:18px;height:18px;border-top:3px solid var(--primary);border-right:3px solid var(--primary);transform:rotate(45deg);flex:0 0 18px}.flow-card{flex:1;border:0;background:var(--surface-low);border-radius:var(--r-lg);padding:13px;display:grid;justify-items:center;gap:4px;text-align:center;transition:background .15s ease,transform .14s ease}.flow-card:hover{background:var(--primary-fixed);transform:translateY(-2px)}.flow-icon{width:72px;height:72px}.flow-icon svg{width:100%;height:100%}.flow-card strong{font-size:16px}.flow-card em{font-style:normal;color:var(--fg-muted);font-size:13px}.chart-cap{display:block;width:100%;margin-top:14px;border:0;background:none;color:var(--fg-2);text-align:left}.chart-cap:hover{color:var(--primary-deep)}.scene-plates{padding-bottom:var(--sp-4)}.scene-plate{border:0;background:none;text-align:left;padding:0}.scene-art{height:150px;border-radius:var(--r-lg);background:linear-gradient(135deg,#fbf2ef,#efe6e3);display:flex;align-items:center;justify-content:center;gap:8px;transition:transform .15s ease}.scene-plate:hover .scene-art{transform:scale(1.02)}.scene-icon{width:88px;height:88px}.scene-icon svg{width:100%;height:100%}.games-section{margin:0 auto var(--sp-10);max-width:var(--content);padding:28px 30px;display:flex;align-items:center;justify-content:space-between;gap:24px;border:1px solid #d8e7dc;border-left:7px solid #3f6b52;border-radius:var(--r-xl);background:linear-gradient(100deg,#eef7ee,#fffaf1 76%);box-shadow:var(--shadow-sm)}.games-section h2{margin:2px 0 6px;font-family:var(--font-headline);font-size:30px;font-weight:500}.games-section p:not(.eyebrow){max-width:650px;margin:0;color:var(--fg-2);line-height:1.7}.games-cta{min-height:48px;border:0;border-radius:var(--r-pill);padding:12px 18px 12px 20px;background:var(--fg-1);color:#fffaf2;font-weight:800;white-space:nowrap}.games-cta span{display:inline-block;margin-left:10px;font-size:20px;vertical-align:-1px}.games-cta:hover{background:var(--primary-deep);transform:translateY(-1px)}.games-page{max-width:var(--content);margin:0 auto;padding:28px 0 72px}.games-head{display:grid;grid-template-columns:auto 1fr auto;gap:24px;align-items:start;margin-bottom:24px}.games-head h1{margin:4px 0 8px;font-family:var(--font-headline);font-size:clamp(38px,5vw,62px);font-weight:500;letter-spacing:0}.games-head .lead{max-width:620px;margin:0}.back-btn{min-height:44px;border:1px solid var(--border-strong);border-radius:var(--r-pill);background:var(--surface-lowest);padding:10px 15px;color:var(--fg-2);font-weight:700}.back-btn:hover{border-color:var(--primary);color:var(--primary-deep)}.game-score{min-width:108px;padding:12px 14px;border-radius:var(--r-lg);background:#fff2d7;color:#7b4d12;text-align:center}.game-score strong{display:block;font-family:var(--font-headline);font-size:30px;font-weight:500;line-height:1}.game-score span{display:block;margin-top:4px;font-size:12px}.game-tabs{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-bottom:12px}.game-tabs button{min-height:66px;border:1px solid var(--border);border-radius:var(--r-lg);background:var(--surface-lowest);padding:12px 16px;color:var(--fg-2);text-align:left}.game-tabs button:hover,.game-tabs button.on{border-color:var(--primary);background:#fff7ee;color:var(--fg-1);box-shadow:0 3px #c94c0021}.game-tabs button span,.game-tabs button small{display:block}.game-tabs button span{font-size:17px;font-weight:800}.game-tabs button small{margin-top:4px;color:var(--fg-muted);font-size:12px}.game-panel{min-height:460px;border:1px solid var(--border);border-radius:var(--r-xl);background:var(--surface-lowest);box-shadow:var(--shadow-md);overflow:hidden}.game-body{min-height:460px;padding:24px;display:grid;align-content:center;gap:18px}.game-scene{position:relative;height:230px;overflow:hidden;border-radius:var(--r-lg);background:linear-gradient(#a9d9f5 0,#a9d9f5 67%,#c7dfb5 67%)}.game-sun{position:absolute;left:10%;top:12%;width:58px;height:58px;border-radius:50%;background:#ffd36a;box-shadow:0 0 0 12px #ffd36a2e}.game-cloud{position:absolute;left:47%;top:26%;width:96px;height:34px;border-radius:40px;background:#fffdf6;opacity:.72;transform:translate(-50%);transition:opacity .25s ease,transform .25s ease}.game-cloud:before,.game-cloud:after{content:"";position:absolute;bottom:8px;border-radius:50%;background:inherit}.game-cloud:before{left:18px;width:44px;height:44px}.game-cloud:after{right:14px;width:52px;height:52px}.game-cloud.is-full{opacity:1;transform:translate(-50%) scale(1.12)}.game-hill{position:absolute;left:-4%;right:-4%;bottom:-52px;height:126px;border-radius:50% 50% 0 0;background:#5f8b68}.game-rain{position:absolute;left:47%;top:34%;width:6px;height:80px;border-radius:6px;background:repeating-linear-gradient(to bottom,transparent 0 14px,#4c99c9 14px 24px);opacity:0;transition:opacity .25s ease}.game-rain.is-raining{opacity:.85;animation:game-rain-fall 1s linear infinite}.game-stream{position:absolute;left:38%;bottom:0;width:25%;height:30px;border-radius:50% 50% 0 0;background:#5ba6c8;opacity:.45}.game-stream.is-flowing{opacity:1;animation:game-stream-flow 1.6s ease-in-out infinite}.game-prompt{min-height:44px;padding:11px 14px;border-left:4px solid var(--primary);border-radius:0 var(--r-md) var(--r-md) 0;background:#fff7ee;color:var(--fg-2);line-height:1.6}.game-prompt strong,.game-prompt span{display:block}.game-prompt strong{color:var(--fg-1)}.game-choice-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:10px}.game-choice{min-height:62px;display:flex;align-items:center;justify-content:center;gap:7px;border:1px solid var(--border);border-radius:var(--r-lg);background:#fff;color:var(--fg-1);font-weight:800}.game-choice:hover:not(:disabled),.game-choice.is-next{border-color:var(--primary);background:#fff2e8}.game-choice:disabled{opacity:.55}.game-choice-number{display:grid;place-items:center;width:24px;height:24px;border-radius:50%;background:var(--primary-fixed);color:var(--primary-deep);font-size:12px}.game-progress{display:flex;justify-content:center;gap:7px}.game-progress span{width:42px;height:5px;border-radius:5px;background:var(--border)}.game-progress span.on{background:var(--primary)}.game-tide-scene{position:relative;height:230px;overflow:hidden;border-radius:var(--r-lg);background:radial-gradient(circle at 30% 24%,rgba(255,255,255,.2),transparent 24%),#163653}.game-tide-sun{position:absolute;left:11%;top:18%;width:44px;height:44px;border-radius:50%;background:#ffd36a;box-shadow:0 0 25px #ffd36a}.game-tide-earth{position:absolute;left:50%;top:50%;width:100px;aspect-ratio:1;transform:translate(-50%,-50%);border-radius:50%;background:#3d91c2;box-shadow:inset -18px -12px #11405640,0 0 0 7px #8fdedb2e}.game-tide-earth:before,.game-tide-earth:after{content:"";position:absolute;border-radius:50%;background:#75ad68}.game-tide-earth:before{left:22px;top:25px;width:30px;height:18px;transform:rotate(-24deg)}.game-tide-earth:after{right:18px;bottom:22px;width:28px;height:19px;transform:rotate(16deg)}.game-tide-moon{position:absolute;top:50%;left:77%;width:52px;height:52px;transform:translate(-50%,-50%);border-radius:50%;background:#f3e5bd;box-shadow:0 0 24px #f3e5bd61;transition:left .25s ease,top .25s ease}.tide-level-0 .game-tide-moon{left:50%;top:20%}.tide-level-1 .game-tide-moon{left:77%;top:50%}.tide-level-2 .game-tide-moon{left:89%;top:50%}.game-tide-water{position:absolute;left:5%;right:5%;bottom:7%;height:28px;border:3px solid rgba(119,224,226,.75);border-radius:50%;transition:transform .3s ease,height .3s ease}.tide-level-2 .game-tide-water{height:72px;transform:scaleX(1.08)}.game-range-label{font-weight:800}.game-tide input[type=range]{width:100%;accent-color:var(--primary)}.game-range-ends{display:flex;justify-content:space-between;margin-top:-12px;color:var(--fg-muted);font-size:12px}.game-hint,.game-success{margin:0;color:var(--fg-muted);font-size:13px}.game-success{color:#2f7650;font-weight:700}.fossil-board{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;padding:28px 18px;border-radius:var(--r-lg);background:#eee4d1}.fossil-slot{min-height:120px;display:grid;place-items:center;border:2px dashed #b89f77;border-radius:var(--r-md);color:#a48b68;background:#ffffff52;font-family:var(--font-headline);font-size:22px}.fossil-slot.is-filled{border-style:solid;border-color:#6f8d6d;color:#315943;background:#e4f1df;animation:fossil-settle .3s ease-out}.fossil-pieces{display:grid;grid-template-columns:repeat(4,1fr);gap:10px}.fossil-pieces button{min-height:54px;border:1px solid var(--border);border-radius:var(--r-lg);background:#fff;color:var(--fg-1);font-weight:800}.fossil-pieces button:hover:not(:disabled){border-color:var(--primary);background:#fff2e8}.fossil-pieces button.is-used{opacity:.48}.gear-scene,.lever-scene{position:relative;height:230px;overflow:hidden;border-radius:var(--r-lg);background:linear-gradient(145deg,#f7efd9,#dce9e3)}.gear-scene:after{content:"";position:absolute;inset:auto 0 0;height:28%;background:#c9b58c;opacity:.45}.gear{position:absolute;z-index:1;border-radius:50%;background:repeating-conic-gradient(from 0deg,#d89a32,#d89a32 13deg,#f4c35e 13deg,#f4c35e 24deg);border:13px solid #9a6721;box-shadow:inset 0 0 0 8px #edbb4c,0 8px 12px #4730132e}.gear:before,.gear:after{content:"";position:absolute;top:28%;right:28%;bottom:28%;left:28%;border-radius:50%;background:#f6d77d;border:5px solid #9a6721}.gear:after{top:45%;right:45%;bottom:45%;left:45%;background:#9a6721;border:0}.gear span{position:absolute;z-index:2;top:45%;right:8%;bottom:45%;left:8%;height:8px;border-radius:8px;background:#9a6721}.gear-large{left:27%;top:40px;width:132px;height:132px;animation:gear-turn 4s linear infinite}.gear-small{left:50%;top:82px;width:94px;height:94px;animation:gear-turn-reverse 2.85s linear infinite}.gear-speed .gear-large{animation-duration:2.85s}.gear-speed .gear-small{animation-duration:2s}.gear-power .gear-large{animation-duration:5.5s}.gear-power .gear-small{animation-duration:3.8s}.gear-arrow{position:absolute;z-index:2;right:9%;top:18%;padding:7px 11px;border-radius:var(--r-pill);background:#fff7e2;color:#7b5a1f;font-size:13px;font-weight:800}.gear-actions{display:grid;grid-template-columns:1fr 1fr;gap:10px}.gear-actions button{min-height:52px;border:1px solid var(--border);border-radius:var(--r-lg);background:#fff;font-weight:800}.gear-actions button:hover,.gear-actions button.on{border-color:#a27624;background:#fff3cc;color:#76500d}.lever-scene{background:linear-gradient(#e1f0fb 0,#e1f0fb 62%,#d4e1c4 62%)}.lever-bar{position:absolute;z-index:2;left:16%;top:58%;width:68%;height:18px;border-radius:18px;background:#b67836;box-shadow:0 4px #51351e2e;transform-origin:50% 50%;transition:transform .25s ease}.lever-load{position:absolute;left:-12px;bottom:13px;width:62px;height:56px;border-radius:8px;background:#89745a;box-shadow:inset 0 6px #ffffff21}.lever-fulcrum{position:absolute;z-index:3;left:50%;top:58%;width:0;height:0;border-left:24px solid transparent;border-right:24px solid transparent;border-bottom:46px solid #5e806d;transform:translate(-50%,8px);transition:left .25s ease}.lever-position-0 .lever-bar{transform:rotate(-7deg)}.lever-position-0 .lever-fulcrum{left:31%}.lever-position-1 .lever-bar{transform:rotate(0)}.lever-position-1 .lever-fulcrum{left:50%}.lever-position-2 .lever-bar{transform:rotate(7deg)}.lever-position-2 .lever-fulcrum{left:69%}@keyframes gear-turn{to{transform:rotate(360deg)}}@keyframes gear-turn-reverse{to{transform:rotate(-360deg)}}@keyframes game-rain-fall{to{transform:translateY(14px)}}@keyframes game-stream-flow{50%{transform:scaleX(1.15)}}@keyframes fossil-settle{0%{transform:translateY(-8px);opacity:.4}to{transform:translateY(0);opacity:1}}.modal-back{position:fixed;top:0;right:0;bottom:0;left:0;background:#1e1b1959;display:grid;place-items:center;padding:20px;overscroll-behavior:contain;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px)}.modal{width:min(470px,100%);background:var(--surface-lowest);border-radius:var(--r-2xl);padding:var(--sp-6);display:grid;gap:var(--sp-3);box-shadow:var(--shadow-lg)}.modal label{display:grid;gap:6px;font-size:14px;font-weight:600}.modal input,.modal select{border:1.5px solid var(--border-strong);border-radius:var(--r-md);padding:11px 13px;background:#fff;color:var(--fg-1);transition:border-color .15s ease}.modal input:focus,.modal select:focus{border-color:var(--primary);outline:none}.modal-actions{display:flex;justify-content:flex-end;gap:12px;margin-top:8px}.site-foot{margin-top:80px;padding-top:24px;border-top:1px solid var(--border);display:flex;align-items:center;justify-content:center;gap:10px;color:var(--fg-muted);font-size:13px}.site-foot p{margin:0}.foot-mark{width:12px;height:12px;border-radius:4px;background:conic-gradient(from 140deg,#c94c00,#f59e0b,#10b981,#3b82f6,#7b40e0,#c94c00)}@keyframes float{50%{transform:translate(calc(var(--i) * 16px),calc(var(--i) * 10px - 12px))}}@keyframes rise{0%{transform:translateY(12px);opacity:0}to{transform:translateY(-24px);opacity:.8}}@keyframes fall{0%{transform:translateY(0);opacity:1}to{transform:translateY(40px);opacity:0}}@keyframes beat{0%,to{transform:scale(1)}30%{transform:scale(1.08)}}@keyframes bob{50%{transform:translateY(-6px)}}@keyframes drift{0%{transform:translate(0)}to{transform:translate(-20px,90px)}}@keyframes dash{to{stroke-dashoffset:-40}}@keyframes flash{0%,70%,to{opacity:.2}75%,85%{opacity:1}}@keyframes magma-pulse{50%{transform:translate(-50%) scale(1.18);filter:brightness(1.22)}}@keyframes magma-rush{0%,to{transform:translate(-50%) scaleY(.78);transform-origin:bottom}50%{transform:translate(-50%) scaleY(1.08);transform-origin:bottom}}@keyframes bubble-rise{0%{transform:translateY(22px) scale(.5);opacity:0}18%{opacity:.88}to{transform:translateY(-128px) scale(1.45);opacity:0}}@keyframes ember-burst{0%{transform:translateY(16px) scale(.45);opacity:0}18%{opacity:.96}to{transform:translate(calc((var(--i) - 5) * 5px),-78px) scale(.75);opacity:0}}@keyframes tide-orbit-pulse{50%{transform:scale(1.18);opacity:.82}}@keyframes tide-swell{50%{transform:scale(1.07,1.16);opacity:.9}}@media(prefers-reduced-motion:reduce){.spark,.step-1 .vapor,.step-0 .vapor,.step-2 .drop,.heart-shape,.ice-block,.falling,.air,.bolt,.grain,.volcano-magma-glow,.volcano-magma-stream,.volcano-bubble,.volcano-ember,.tide-orbit-glow,.tide-water-pulse,.phase-magma .volcano-magma-glow,.phase-pressure .volcano-magma-glow,.phase-pressure .volcano-bubble,.phase-crack .volcano-magma-glow,.phase-crack .volcano-magma-stream,.phase-crack .volcano-bubble,.phase-crack .volcano-ember,.tide-state-pull .tide-orbit-glow,.tide-state-bulge .tide-water-pulse,.tide-state-turn .tide-orbit-glow,.tide-state-turn .tide-water-pulse{animation:none}.topic-card,.flow-card,.scene-art,.word-card,.ask-btn,.speak-btn,.card-speak,.game-cloud,.game-tide-moon,.game-tide-water,.fossil-slot{transition:none}.game-rain.is-raining,.game-stream.is-flowing,.fossil-slot.is-filled{animation:none}.gear,.lever-bar,.lever-fulcrum{animation:none;transition:none}}@media(max-width:720px){.askbar{grid-template-columns:1fr auto}.ask-btn{grid-column:1 / -1}.viz-3d{height:300px}.volcano-viz,.tides-viz{min-height:350px}.hero{padding:var(--sp-8) var(--sp-5) var(--sp-6)}.hero-art{width:78%;opacity:.45}.hero h1,.answer h1{font-size:36px}.plates{grid-template-columns:1fr}.catalog-head{flex-direction:column;gap:2px}.games-section{align-items:flex-start;flex-direction:column;padding:24px 20px}.games-cta{width:100%}.games-head{grid-template-columns:1fr auto;gap:14px}.games-head .back-btn{grid-column:1 / -1;justify-self:start}.game-tabs{grid-template-columns:1fr}.game-body{padding:16px}.game-choice-grid,.fossil-pieces,.fossil-board{grid-template-columns:repeat(2,1fr)}}.bridge-lab{display:grid;gap:16px;padding:18px;background:#fffdf8}.bridge-story{display:flex;align-items:center;gap:14px}.bridge-story p{margin:0;color:var(--fg-2);line-height:1.65}.bridge-mission{flex:0 0 auto;padding:7px 12px;border-radius:var(--r-pill);background:#e4f1df;color:#315943;font-size:13px;font-weight:800}.bridge-scene{position:relative;overflow:hidden;border:1px solid #cbded6;border-radius:var(--r-xl);background:#dff1fa;box-shadow:inset 0 -8px 22px #22505114}.bridge-scene svg{display:block;width:100%;height:auto}.bridge-deck-shadow{fill:none;stroke:#47312133;stroke-width:34;stroke-linecap:round;transition:d .32s ease}.bridge-deck{fill:none;stroke:#d7b074;stroke-width:25;stroke-linecap:round;transition:d .32s ease}.bridge-bracing{fill:none;stroke:#8c633d;stroke-width:9;stroke-linecap:round;stroke-linejoin:round}.bridge-support{transition:transform .24s ease}.bridge-weak-point circle{fill:#d85a3024;stroke:#d85a30;stroke-width:4;animation:bridge-warning-pulse .9s ease-in-out 2}.bridge-weak-point path{stroke:#d85a30;stroke-width:5;stroke-linecap:round}.bridge-truck-run{animation:bridge-truck-cross 1.15s ease-in-out both}.bridge-state-failed .bridge-truck-run{animation-name:bridge-truck-fail}.bridge-state-bending .bridge-truck-run{animation-name:bridge-truck-bend}.bridge-scene-key{position:absolute;left:12px;bottom:10px;display:flex;gap:10px;padding:6px 10px;border-radius:var(--r-pill);background:#fffdf8e6;color:#5f5548;font-size:11px;font-weight:700;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px)}.bridge-scene-key span{display:inline-flex;align-items:center;gap:4px}.bridge-scene-key i{width:10px;height:10px;border-radius:3px}.bridge-scene-key .key-deck{background:#d7b074}.bridge-scene-key .key-support{background:#b88254}.bridge-scene-key .key-load{background:#f0bc58}.bridge-feedback{min-height:56px;padding:11px 14px;border-left:5px solid #d85a30;border-radius:0 var(--r-md) var(--r-md) 0;background:#fff5e7;color:var(--fg-2);line-height:1.55}.bridge-feedback strong,.bridge-feedback span{display:block}.bridge-feedback strong{color:var(--fg-1)}.bridge-tools{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px}.bridge-tools fieldset{min-width:0;margin:0;padding:12px;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px;border:1px solid var(--border);border-radius:var(--r-lg);background:#fff}.bridge-tools fieldset:disabled{opacity:.45}.bridge-tools legend{padding:0 5px;color:var(--fg-muted);font-size:12px;font-weight:800}.bridge-tools button,.bridge-predict button,.bridge-home-challenge button{min-height:44px;border:1px solid var(--border-strong);border-radius:var(--r-md);background:#fffdf8;color:var(--fg-1);font-weight:800;transition:transform .15s ease,background .15s ease,border-color .15s ease}.bridge-tools button:hover:not(:disabled),.bridge-predict button:hover:not(:disabled),.bridge-home-challenge button:hover{transform:translateY(-2px);border-color:var(--primary)}.bridge-tools button.on,.bridge-predict button.on{border-color:#d85a30;background:#fff0e7;color:#983a18;box-shadow:0 2px #d85a3024}.bridge-load-count{grid-column:1 / -1;display:grid;grid-template-columns:repeat(3,1fr);gap:6px}.bridge-predict{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:14px;border:1px dashed #d7aa7e;border-radius:var(--r-lg);background:#fffaf1}.bridge-predict>strong{font-family:var(--font-headline);font-size:20px;font-weight:500}.bridge-predict>div{display:flex;gap:8px}.bridge-predict button{padding:8px 14px}.bridge-predict .bridge-test{border:0;background:linear-gradient(135deg,#c94c00,#e85d1f);color:#fff;box-shadow:var(--shadow-accent)}.bridge-predict .bridge-test:disabled{opacity:.42;box-shadow:none}.bridge-comparison{display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:8px;padding:16px;border:1px solid #cde1c8;border-radius:var(--r-lg);background:#eff8ec;color:#315943;text-align:center}.bridge-comparison>span:not([aria-hidden]){padding:9px;border-radius:var(--r-md);background:#ffffffb8;font-weight:800}.bridge-comparison p{grid-column:1 / -1;margin:5px 0 0;line-height:1.6}.bridge-home-challenge{display:flex;align-items:center;justify-content:space-between;gap:18px;padding:18px;border-radius:var(--r-xl);background:linear-gradient(110deg,#e9f4fb,#fff4db);border:1px solid #cbdfe5}.bridge-home-challenge span,.bridge-home-challenge strong{display:block}.bridge-home-challenge span{color:#3f6b52;font-size:12px;font-weight:800;letter-spacing:.05em}.bridge-home-challenge strong{margin-top:3px;font-family:var(--font-headline);font-size:22px;font-weight:500}.bridge-home-challenge p{margin:5px 0 0;color:var(--fg-2);line-height:1.6}.bridge-home-challenge button{flex:0 0 auto;padding:8px 15px}@keyframes bridge-truck-cross{0%{transform:translate(-245px)}to{transform:translate(235px)}}@keyframes bridge-truck-bend{0%{transform:translate(-245px) translateY(0)}62%{transform:translate(0) translateY(24px)}to{transform:translate(235px) translateY(0)}}@keyframes bridge-truck-fail{0%{transform:translate(-245px) translateY(0)}70%,to{transform:translate(0) translateY(48px)}}@keyframes bridge-warning-pulse{50%{transform:scale(1.18);transform-origin:400px 220px}}@media(prefers-reduced-motion:reduce){.bridge-truck-run,.bridge-weak-point circle{animation:none}.bridge-deck,.bridge-deck-shadow,.bridge-support,.bridge-tools button,.bridge-predict button,.bridge-home-challenge button{transition:none}}@media(max-width:720px){.bridge-lab{padding:12px;gap:12px}.bridge-story{align-items:flex-start;flex-direction:column;gap:8px}.bridge-tools{grid-template-columns:1fr}.bridge-predict{align-items:stretch;flex-direction:column}.bridge-predict>div{display:grid;grid-template-columns:1fr 1fr}.bridge-predict .bridge-test{grid-column:1 / -1}.bridge-home-challenge{align-items:stretch;flex-direction:column}.bridge-home-challenge button{width:100%}.bridge-scene-key{right:8px;left:8px;justify-content:center}}.tap-water-viz{overflow:hidden;border:1px solid #bfd8d2;border-radius:18px;background:#fffdf7}.tap-water-scene{min-height:286px;background:#dff4f2}.tap-water-sky{height:102px;position:relative;overflow:hidden;background:linear-gradient(#92d7e9,#dff4f2)}.tap-water-sky span{position:absolute;top:17px;right:34px;color:#f2bd43;font-size:35px;line-height:1}.tap-water-sky i{position:absolute;width:75px;height:17px;border-radius:50%;background:#ffffffb8}.tap-water-sky i:nth-child(2){top:26px;left:20%}.tap-water-sky i:nth-child(3){top:56px;left:59%;width:51px}.tap-water-ground{min-height:184px;position:relative;overflow:visible;border-top:4px solid #75a85f;background:linear-gradient(#b77d51 0,#b77d51 13px,#704a38 13px,#704a38)}.tap-water-place{z-index:2;position:absolute;top:-54px;width:88px;min-height:63px;display:flex;flex-direction:column;align-items:center;justify-content:center;border:3px solid #497465;border-radius:13px 13px 4px 4px;color:#173e43;background:#f8edc7;box-shadow:0 3px #355e55;text-align:center}.tap-water-place b{font-size:15px}.tap-water-place small{margin-top:2px;color:#5f6756;font-size:11px}.water-source{left:6%;background:#9eddeb}.water-plant{left:31%;background:#e8dc91}.water-home{left:57%;background:#f6c68f}.water-return{left:82%;transform:translate(-50%);background:#c6dec0}.tiny-faucet{position:absolute;right:8px;bottom:2px;color:#427c93;font-size:26px;font-weight:800;transform:rotate(90deg)}.tap-water-pipe{position:absolute;z-index:1;height:28px;border:7px solid;border-radius:0 0 20px 20px}.supply-pipe{border-color:#2c9dc0}.drain-pipe{border-color:#b58d69}.pipe-one{top:53px;left:9%;width:30%;border-top:0}.pipe-two{top:90px;left:37%;width:27%;border-top:0}.drain-one{top:127px;left:57%;width:20%;border-top:0;transform:rotate(180deg)}.drain-two{top:92px;left:74%;width:15%;border-top:0;transform:rotate(180deg)}.pipe-tag{z-index:3;position:absolute;bottom:8px;border-radius:999px;padding:3px 8px;color:#fff;font-size:11px;font-weight:700}.supply-tag{left:23%;background:#247c9d}.drain-tag{right:9%;background:#8e684f}.water-drop{z-index:4;position:absolute;top:35px;left:10%;font-size:31px;filter:drop-shadow(0 2px 1px rgba(21,72,89,.3));transition:left .45s ease,top .45s ease}.tap-water-step-1 .water-drop{left:37%;top:72px}.tap-water-step-2 .water-drop{left:62%;top:88px}.tap-water-step-3 .water-drop{left:84%;top:121px;filter:grayscale(.35) drop-shadow(0 2px 1px rgba(60,40,30,.3))}.tap-water-viz .tap-water-caption{position:static;width:auto;padding:13px 16px 15px;background:#fffdf7}.tap-water-caption>p{margin:0;line-height:1.65}.tap-water-steps{margin-top:11px}.tap-water-hint{margin-top:10px!important;color:#4a695b;font-size:13px}@media(prefers-reduced-motion:reduce){.water-drop{transition:none}}@media(max-width:520px){.tap-water-place{width:70px;min-height:57px;top:-50px}.tap-water-place b{font-size:13px}.tap-water-place small{font-size:10px}.water-return{left:84%}.pipe-one{left:8%;width:31%}.pipe-two{left:36%;width:29%}.drain-one{left:57%;width:22%}.tap-water-steps{gap:7px}}.shadow-lab{overflow:hidden;border:1px solid #c6d9d5;border-radius:var(--r-xl);background:#fffdf8}.shadow-scene{display:block;width:100%;height:auto}.shadow-ray{stroke:#ffee9beb;stroke-width:22;stroke-linecap:round;transition:x1 .28s ease,y1 .28s ease,x2 .28s ease,y2 .28s ease}.shadow-lamp{transition:transform .28s ease}.dino-shadow{fill:#485563;stroke:#252f3a80;stroke-width:3;opacity:.72;transition:d .28s ease}.shadow-lab .shadow-caption{position:static;width:auto;padding:var(--sp-4) var(--sp-5) var(--sp-5);background:#fffdf8}.shadow-caption>p{margin:0;line-height:1.65}.shadow-actions{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin-top:12px}.shadow-actions button{min-height:46px;border:1.5px solid #c8d8c8;border-radius:var(--r-pill);background:#fff;color:#496158;font-weight:800;transition:background .2s ease,border-color .2s ease,color .2s ease,transform .16s ease}.shadow-actions button:hover,.shadow-actions button.on{border-color:#d85a30;background:#fff1dd;color:#913a1c}.shadow-actions button:active{transform:translateY(1px)}.shadow-hint{margin-top:11px!important;color:#5d6e60;font-size:13px}.shadow-scene-label{fill:#6d6353;font-size:15px;font-weight:700}@media(prefers-reduced-motion:reduce){.shadow-ray,.shadow-lamp,.dino-shadow,.shadow-actions button{transition:none}}@media(max-width:520px){.shadow-actions{gap:6px}.shadow-actions button{padding:7px 4px;font-size:13px}.shadow-scene-label{font-size:12px}}.wheel-lab{overflow:hidden;border:1px solid #c9d8cf;border-radius:var(--r-xl);background:#fffdf8}.wheel-scene{display:block;width:100%;height:auto}.wheel-road{stroke:#805f41;stroke-width:9;stroke-linecap:round}.wheel-rocks{fill:none;stroke:#9a7956;stroke-width:8;stroke-linecap:round;stroke-linejoin:round}.wheel-goal path{fill:none;stroke:#496d58;stroke-width:7;stroke-linecap:round;stroke-linejoin:round}.wheel-goal path:nth-child(2){fill:#e85d75;stroke:#983a54}.wheel-goal path:nth-child(3){stroke:#fffdf8;stroke-width:4}.wheel-cart{transition:transform .28s ease}.wheel-state-roll .wheel-cart{transform:translate(92px)}.wheel-state-rough .wheel-cart{transform:translate(54px) translateY(-4px)}.wheel-push-arrow{fill:none;stroke:#d85a30;stroke-width:9;stroke-linecap:round;stroke-linejoin:round}.wheel-box{fill:#d89a5b;stroke:#885431;stroke-width:6}.wheel-box-lines{fill:none;stroke:#63391f8c;stroke-width:5;stroke-linecap:round}.wheel-scrape{fill:none;stroke:#5e4633;stroke-width:8;stroke-linecap:round}.wheel-wheel{fill:#5ea0c8;stroke:#28566e;stroke-width:7}.wheel-wheel path{fill:none;stroke:#e4f4f4;stroke-width:5;stroke-linecap:round}.wheel-state-roll .wheel-wheel,.wheel-state-rough .wheel-wheel{animation:wheel-roll .48s linear 1;transform-origin:center}.wheel-effort text{fill:#6d6353;font-size:16px;font-weight:800}.wheel-effort rect{fill:#e8dfd0;stroke:#b8a790;stroke-width:2}.wheel-effort rect.on{fill:#d85a30;stroke:#9c4529}.wheel-scene-label{fill:#6d6353;font-size:15px;font-weight:700}.wheel-lab .wheel-caption{position:static;width:auto;padding:var(--sp-4) var(--sp-5) var(--sp-5);background:#fffdf8}.wheel-caption>p{margin:0;line-height:1.65}.wheel-actions{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin-top:12px}.wheel-actions button{min-height:46px;border:1.5px solid #c8d8c8;border-radius:var(--r-pill);background:#fff;color:#496158;font-weight:800;transition:background .2s ease,border-color .2s ease,color .2s ease,transform .16s ease}.wheel-actions button:hover,.wheel-actions button.on{border-color:#d85a30;background:#fff1dd;color:#913a1c}.wheel-actions button:active{transform:translateY(1px)}.wheel-hint{margin-top:11px!important;color:#5d6e60;font-size:13px}@keyframes wheel-roll{to{transform:rotate(360deg)}}@media(prefers-reduced-motion:reduce){.wheel-cart,.wheel-actions button{transition:none}.wheel-state-roll .wheel-wheel,.wheel-state-rough .wheel-wheel{animation:none}}@media(max-width:520px){.wheel-actions{gap:6px}.wheel-actions button{padding:7px 4px;font-size:13px}.wheel-scene-label{font-size:12px}}
