:root{color-scheme:dark;--ink:#071c27;--cyan:#5de6f6;--white:#f1f9fb;--muted:#92abb7;--line:#203945;font-family:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft Yahei",sans-serif}*{box-sizing:border-box}body{margin:0;background:radial-gradient(ellipse at 55% 40%,#133744 0%,#081e2a 42%,#061720 100%);color:var(--white);min-height:100svh}button,a{-webkit-tap-highlight-color:transparent}button{font:inherit;cursor:pointer;border:0;color:inherit}button:focus-visible,a:focus-visible{outline:3px solid #e9fb71;outline-offset:4px}button:disabled{opacity:.4;cursor:default}.topbar{height:94px;max-width:1350px;margin:auto;display:flex;align-items:center;justify-content:space-between;padding:0 52px}.brand{display:flex;gap:14px;align-items:center;color:var(--white);text-decoration:none;font-size:14px;font-weight:750;letter-spacing:1.7px}.brand-mark{display:flex;align-items:center;justify-content:center;background:var(--cyan);color:var(--ink);font-size:32px;font-weight:900;width:45px;height:45px;border-radius:12px;letter-spacing:-3px}.brand-mark span{font-size:22px;align-self:flex-start;margin-top:6px}.brand small{font-size:12px;display:block;color:var(--muted);font-weight:400;letter-spacing:2px;margin-top:5px}.tools{display:flex;gap:9px}.tools button{background:#102c39;border:1px solid var(--line);border-radius:10px;padding:10px 13px;font-size:13px;min-height:40px}.tools button:hover{background:#234655}.layout{max-width:1200px;margin:0 auto;display:grid;grid-template-columns:260px minmax(340px,520px) 170px;justify-content:center;align-items:center;gap:42px;padding:0 28px}.intro{align-self:center}.eyebrow{color:var(--cyan);letter-spacing:2.5px;font-size:11px;font-weight:700;margin-bottom:20px}h1{font-size:43px;line-height:1.32;letter-spacing:-1.5px;margin:0;font-weight:850}h1 em{font-style:normal;color:var(--cyan)}.intro>p{font-size:14px;line-height:1.8;color:var(--muted);margin:20px 0 33px}.rule{display:flex;gap:12px;margin:22px 0}.rule-num{color:#648493;font-size:12px;padding-top:4px;letter-spacing:1px}.rule strong{display:block;font-size:15px;font-weight:600;margin-bottom:5px}.rule div>span{display:block;color:var(--muted);font-size:12px;line-height:1.6}.local-best{border-top:1px solid var(--line);margin-top:30px;padding-top:24px;display:flex;align-items:baseline;flex-wrap:wrap;justify-content:space-between;font-size:13px;color:var(--muted)}.local-best strong{font-size:28px;color:var(--white);font-variant-numeric:tabular-nums}.local-best .best-note{flex-basis:100%;font-size:11px;margin-top:7px;opacity:.7}.game-frame{height:calc(100svh - 150px);min-height:540px;max-height:830px;position:relative;border:1px solid #438796;border-radius:26px;overflow:hidden;isolation:isolate;box-shadow:0 25px 100px #0007,0 0 60px #5de6f60b;background:#286c73}canvas{display:block;width:100%;height:100%;touch-action:none}.hud{position:absolute;inset:0 0 auto;padding:24px 23px 16px;display:flex;align-items:flex-start;gap:20px;background:linear-gradient(#072633db,#07263300);pointer-events:none}.hud>div span{font-size:11px;color:#d1eff3;font-weight:500}.hud strong{font-size:36px;display:block;line-height:1.25;letter-spacing:-1px;font-weight:850;font-variant-numeric:tabular-nums}.hud .goal{margin-left:auto;text-align:right}.hud .goal strong{font-size:23px;margin-top:8px}.hud .goal strong span{font-size:20px;color:var(--cyan)}.icon-button{width:34px;height:34px;margin:8px 0 0 4px;background:#09273266;border:1px solid #d4fcff40;border-radius:10px;pointer-events:auto;font-size:18px}.progress-track{position:absolute;top:101px;left:24px;right:24px;height:3px;background:#c9fbff35;border-radius:10px;overflow:hidden}.progress-track>div{background:#eaff92;height:100%;width:0%;box-shadow:0 0 10px #eaff92}.overlay{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;padding:28px;background:linear-gradient(#0c3c4920,#08293665 50%,#041b27bf);backdrop-filter:blur(2px)}.overlay[hidden]{display:none}.start-card{text-align:center;width:100%;max-width:360px;transform:translateY(25px)}.pill{display:inline-block;border:1px solid #b9f8ff66;border-radius:25px;padding:7px 13px;font-size:12px;background:#09293480}.hero-number{position:relative;font-family:Arial,sans-serif;font-size:116px;line-height:1.5;letter-spacing:-8px;font-weight:1000;color:#e9fb71;text-shadow:1px 1px #95b435,2px 2px #95b435,3px 3px #95b435,4px 4px #95b435,5px 5px #5d811c,6px 6px #5d811c,7px 7px #5d811c,12px 22px 14px #06292b66;transform:rotate(-8deg)}.hero-number span{position:absolute;right:70px;top:18px;font-size:30px;color:#f5ffff;letter-spacing:-1px;text-shadow:none;transform:rotate(18deg)}h2{font-size:28px;line-height:1.4;letter-spacing:-1px;margin:3px 0 10px}.start-card p,.result-card p{color:#d2e7ec;font-size:14px;line-height:1.8;margin:0 0 23px}.primary{display:flex;justify-content:space-between;align-items:center;width:100%;min-height:54px;background:#eaff92;color:#163322;font-weight:750;border-radius:13px;padding:0 22px;box-shadow:0 5px 0 #799549;transition:transform .15s,filter .15s}.primary:hover{filter:brightness(1.08);transform:translateY(-2px)}.primary:active{transform:translateY(3px);box-shadow:0 2px 0 #799549}.primary>span:last-child{font-size:24px;font-weight:400}.start-hint{font-size:12px;color:#c1dce4;margin-top:22px}.bottom-controls{position:absolute;bottom:0;left:0;right:0;display:flex;align-items:center;justify-content:space-between;padding:22px;background:linear-gradient(transparent,#0a293bb0);pointer-events:none}.bottom-controls button{width:48px;height:40px;border:1px solid #c8f8ff55;border-radius:12px;background:#0d344b66;pointer-events:auto;font-size:25px}.bottom-controls>span{font-size:12px;color:#ebfcff;letter-spacing:2px}.side-note{align-self:stretch;display:flex;flex-direction:column;align-items:flex-start;justify-content:flex-end;padding:20px 0}.vertical-label{writing-mode:vertical-rl;font-size:11px;letter-spacing:4px;color:#7297a7;margin-bottom:auto;align-self:flex-end;padding-right:5px}.run-label{border-top:1px solid var(--line);width:100%;padding-top:24px;margin:22px 0}.run-label>span{font-size:42px;font-weight:300;letter-spacing:-2px;color:#8eacba}.run-label>p{font-size:13px;color:#b5cbd6}.legend{font-size:11px;color:var(--muted);display:flex;align-items:center;gap:8px;margin-bottom:12px}.try-note{font-size:11px;line-height:1.8;color:#73919f;margin:18px 0 0}footer{max-width:1250px;display:flex;justify-content:space-between;margin:23px auto 0;padding:0 42px 20px;color:#597c8c;font-size:10px;letter-spacing:1px}.toast{position:absolute;left:50%;top:130px;transform:translateX(-50%);text-align:center;color:#14343a;font-weight:650;background:#e6fdff;padding:9px 14px;border-radius:20px;font-size:13px;white-space:nowrap;opacity:0;transition:opacity .2s;pointer-events:none}.toast.show{opacity:1}.result-card{background:#072936e8;border:1px solid #6794a377;border-radius:22px;padding:30px 25px;text-align:center;width:100%;max-width:365px;box-shadow:0 20px 50px #06202cb0}.result-value{font-size:76px;font-weight:850;line-height:1.2;color:#eaff92;letter-spacing:-4px;margin:14px 0}.secondary{display:block;width:100%;min-height:45px;border:1px solid #456778;background:#153d4e;border-radius:12px;font-size:14px;margin-top:15px}.result-card small{display:block;font-size:11px;line-height:1.7;color:#91b1c1;margin-top:13px}.overlay:has(.result-card){backdrop-filter:blur(5px);background:#05232b7a}.overlay:has(.result-card) h2{font-size:26px}.result-card .pill{color:var(--cyan)}
@media(min-width:1450px){.layout{gap:55px}}@media(max-width:1060px){.layout{grid-template-columns:210px minmax(340px,500px);gap:30px}.side-note{display:none}.topbar{padding:0 32px}h1{font-size:36px}}@media(max-width:720px){.topbar{height:67px;padding:0 18px}.brand{font-size:11px;gap:9px;letter-spacing:1.2px}.brand-mark{width:35px;height:35px;font-size:26px;border-radius:10px}.brand-mark span{font-size:18px;margin-top:3px}.brand small{font-size:10px;margin-top:4px;letter-spacing:1px}.tools{gap:6px}.tools button{padding:8px 10px;min-height:34px;font-size:12px}.layout{display:block;padding:0 10px}.intro,.side-note{display:none}.game-frame{height:calc(100svh - 104px);min-height:430px;max-height:none;max-width:520px;margin:auto;border-radius:20px}.hud{padding:19px 20px}.hud strong{font-size:31px}.progress-track{top:89px;left:20px;right:20px}.start-card{transform:translateY(15px)}.hero-number{font-size:100px}.hero-number span{right:75px}h2{font-size:26px}.start-card p{font-size:13px}.overlay{padding:28px}footer{margin:13px auto 0;padding:0 20px 12px;font-size:9px}footer>span:nth-child(2){display:none}.bottom-controls{padding:17px}.toast{top:107px;font-size:12px}}@media(max-height:660px){.hero-number{font-size:72px;line-height:1.35}.start-card{transform:translateY(25px)}.start-card p{margin-bottom:17px}.start-hint{margin-top:16px}.pill{font-size:11px}.intro .rule{margin:12px 0}.intro>p{margin:14px 0}.local-best{margin-top:18px;padding-top:14px}.game-frame{min-height:400px}.result-card{padding:22px}.result-value{font-size:60px;margin:8px 0}}.reduce-motion *{scroll-behavior:auto!important;transition:none!important}
/* Chapter two: clear missions, visible progression and stronger growth feedback. */
.eyebrow{font-size:10px;letter-spacing:1.6px}.goal small{display:block;font-size:10px;color:#e3eab6;margin-top:3px}.goal.met strong,.goal.met small{color:#eaff92}.hud{padding-top:22px}.hud strong{transform-origin:left center}.hud .goal strong{font-size:23px}.level-title{position:absolute;top:116px;left:24px;color:#edffff;font-size:11px;font-weight:750;letter-spacing:1px;pointer-events:none;text-shadow:0 1px 5px #123e4e}.progress-track{top:105px}.toast{top:143px;max-width:calc(100% - 24px);white-space:normal;width:max-content;font-size:12px;line-height:1.4}.level-picker{display:grid;grid-template-columns:repeat(6,1fr);gap:6px;margin:21px 0 0}.level-chip{background:#0a3046b3;border:1px solid #7196a566;border-radius:10px;padding:8px 2px;color:#c6e3e8;min-width:0}.level-chip b{font-size:16px;display:block}.level-chip small{display:block;font-size:9px;margin-top:4px;white-space:nowrap}.level-chip.selected{border-color:#eaff92;background:#dfff9e1a;color:#edffb0}.level-chip.locked{color:#8ba7b2}.level-chip:hover{border-color:#dfffa8}.start-card{max-width:374px;transform:translateY(27px)}.hero-number{font-size:94px;line-height:1.3;margin:20px 0 8px}.hero-number span{right:22%;top:9px;font-size:27px}.start-card h2{font-size:30px;margin:0 0 8px}.mission-line{display:flex;align-items:center;justify-content:center;gap:20px;font-size:13px;color:#bddfe2;margin:7px 0 15px}.mission-line b{font-size:19px;color:#eaff92}.mission-line>span+span{font-size:12px;padding-left:17px;border-left:1px solid #81b2b777}.start-card p{min-height:45px;font-size:13px;line-height:1.7;margin-bottom:20px}.primary:disabled{opacity:.6;cursor:not-allowed;box-shadow:none;transform:none;background:#8eafa6}.bottom-controls>span{font-size:11px;letter-spacing:.4px;text-align:center;max-width:65%;line-height:1.5}.result-card h2{margin-top:18px}.result-value{font-size:clamp(44px,7vw,72px);letter-spacing:-2px}.result-target{font-size:12px;color:#b7d6df;margin:-4px 0 18px}.result-target b{color:#eaff92;margin-left:6px}.result-card p{font-size:13px;margin-bottom:20px}.start-hint{font-size:11px;margin-top:18px}
@media(max-width:720px){.level-title{top:107px;left:20px;font-size:10px}.progress-track{top:97px}.toast{top:132px}.hud{padding-top:18px}.hud .goal strong{font-size:22px}.hud .goal small{font-size:9px}.overlay{padding:22px}.hero-number{font-size:88px}.level-picker{gap:4px}.level-chip small{font-size:8px}.level-chip b{font-size:15px}.start-card{transform:translateY(26px)}.bottom-controls button{flex-shrink:0}}
@media(max-height:700px){.hero-number{font-size:54px;line-height:1.1;margin:12px 0 7px}.hero-number span{font-size:20px}.level-picker{margin-top:14px}.level-chip{padding:5px 1px}.start-card h2{font-size:23px}.start-card p{font-size:12px;min-height:0;margin-bottom:12px}.start-card .pill{font-size:10px;padding:5px 10px}.mission-line{margin:4px 0 10px}.start-hint{margin-top:12px}.result-card{padding:19px}.result-card p{margin-bottom:14px}.result-value{font-size:48px;margin:8px 0}.result-card .secondary{margin-top:10px;min-height:40px}}
.game-frame:has(.overlay:not([hidden])) .bottom-controls{visibility:hidden}
.tools{flex-shrink:0}.tools button{white-space:nowrap}.brand{min-width:0}.brand>span:last-child{min-width:0}.brand small{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
@media(max-width:720px){.brand{gap:8px}.brand small{max-width:137px;font-size:8px;letter-spacing:.6px}.topbar{gap:9px}.tools button{padding:8px}.brand-mark{flex-shrink:0}}
/* The fork warning describes missing road, not whether a number can be eaten. */
.fork-warning{position:absolute;top:143px;left:18px;right:18px;display:flex;gap:10px;align-items:center;padding:10px 12px;border:1px solid #ff9b70;border-radius:10px;background:#291b25ed;color:#ffe8cf;pointer-events:none;box-shadow:0 4px 18px #06172260}.fork-warning[hidden]{display:none}.no-crossing-icon{display:flex;align-items:center;justify-content:center;flex-shrink:0;width:27px;height:27px;border:2px solid #ff9671;border-radius:50%;font:bold 27px/1 Arial;color:#ffd9b8}.fork-warning strong{font-size:12px;display:block;line-height:1.35}.fork-warning small{font-size:10px;display:block;line-height:1.45;margin-top:3px;color:#eac5b1}.fork-visible .toast{top:214px}
@media(max-width:720px){.fork-warning{top:131px;left:14px;right:14px;padding:9px 10px;gap:8px}.fork-warning strong{font-size:11px}.fork-warning small{font-size:9px}.fork-visible .toast{top:198px}}

/* Keep the full look-ahead area visible on short screens. */
.fork-visible .toast{opacity:0}
@media(max-height:660px){.fork-warning{display:none}.fork-visible .bottom-controls>span{color:#ffe2c5;background:#2c1a25e8;border:1px solid #ff9b70;border-radius:8px;padding:5px 7px;font-size:10px;letter-spacing:0}}

.map-label{display:block;margin:10px 0;color:#9bc3c9;font-size:12px;letter-spacing:1px;font-variant-numeric:tabular-nums}

/* Read the same three upcoming pickups without calculating or revealing a winner. */
.fork-warning small{font-size:16px;line-height:1.5;color:#f1f9fb;font-variant-numeric:tabular-nums}
.fork-warning small>span{display:block;white-space:nowrap}.fork-warning small b{display:inline-block;min-width:44px;font-size:11px;letter-spacing:.5px;color:#c6d6dc}
@media(max-height:660px){.fork-warning{display:block;top:125px;padding:5px 10px;left:14px;right:14px;background:#142e39f5;border-color:#648e9b}.fork-warning[hidden]{display:none}.fork-warning .no-crossing-icon,.fork-warning strong{display:none}.fork-warning small{display:flex;justify-content:space-between;gap:10px;font-size:14px;margin:0}.fork-warning small b{display:block;min-width:0;font-size:12px;line-height:1.3}.fork-warning small>span{white-space:nowrap}}

/* Settings match the WeChat feature set while retaining native browser controls. */
.topbar{position:relative;z-index:5}.tools details{position:relative}.tools summary{cursor:pointer;list-style:none;min-height:44px;display:flex;align-items:center;padding:10px 15px;background:#102c39;border:1px solid var(--line);border-radius:10px;font-size:14px}.tools summary::-webkit-details-marker{display:none}.tools summary:focus-visible{outline:3px solid #e9fb71;outline-offset:4px}.settings-panel{position:absolute;right:0;top:calc(100% + 10px);width:min(320px,calc(100vw - 36px));padding:16px;background:#092532;border:1px solid #438796;border-radius:16px;box-shadow:0 18px 45px #0009}.settings-row{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:10px 0;border-bottom:1px solid var(--line);font-size:14px}.settings-panel button{min-height:44px;font-size:14px}.settings-panel button[aria-pressed=true]{border-color:#eaff92;color:#eaff92}.settings-panel p{font-size:13px;line-height:1.6;color:var(--muted)}#settings-done{width:100%;color:var(--ink);background:#eaff92;font-weight:700}

/* Readable guide links below the play area, including narrow screens. */
.game-info{max-width:1120px;margin:16px auto 48px;padding:28px 32px;border-top:1px solid var(--line)}
.game-info h2{font-size:24px;letter-spacing:-.4px;margin:0 0 16px}
.game-info p{max-width:78ch;font-size:16px;line-height:1.8;color:#c1d7e1;margin:12px 0}
.game-info nav{display:flex;flex-wrap:wrap;gap:12px 24px;margin:18px 0}
.game-info a,.rules-link{color:var(--cyan);font-size:16px;line-height:1.5;text-underline-offset:4px}
.game-info nav a{padding:8px 0}.game-info .creator{font-size:14px;color:var(--muted)}
.rules-link{display:block;padding:16px 0 0;font-size:14px}
@media(max-width:720px){.game-info{padding:24px 20px;margin-top:8px}.game-info h2{font-size:22px}.game-info nav{gap:0 20px}.game-info p{line-height:1.75}}
:root{color-scheme:dark}
.tools .feedback-entry{min-height:44px;font-size:14px;padding:10px 12px}
.feedback-toast{position:fixed;bottom:28px;left:50%;transform:translateX(-50%);z-index:20;width:max-content;max-width:calc(100vw - 32px);padding:14px 20px;border:1px solid #a6bd70;border-radius:12px;background:#eaff92;color:#071c27;font-size:16px;line-height:1.5;text-align:center;box-shadow:0 8px 28px #0006;pointer-events:none}
.feedback-toast[hidden]{display:none}
@media(max-width:400px){.tools{gap:4px}.tools .feedback-entry,.tools summary{padding:10px 8px}.topbar .brand small{max-width:100px}.topbar .brand{font-size:15px}}
#feedback-dialog{color:#e8f8fb;background:#102d38;border:1px solid #4d8e9b;border-radius:20px;width:min(520px,calc(100vw - 28px));max-height:calc(100dvh - 28px);padding:24px;overflow:auto;box-shadow:0 20px 70px #0009}
#feedback-dialog::backdrop{background:#031018b8}
.feedback-heading{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:22px}
.feedback-heading h2{font-size:24px;margin:0}
#feedback-close{min-height:44px;padding:8px 14px}
#feedback-form label{display:block;font-size:16px;margin:18px 0 8px;font-weight:700}
#feedback-form textarea,#feedback-email{box-sizing:border-box;width:100%;color:#effcff;background:#071e28;border:1px solid #639ca6;border-radius:10px;padding:12px;font:400 16px/1.5 system-ui,sans-serif}
#feedback-form textarea{resize:vertical;min-height:120px}
#feedback-form textarea:focus,#feedback-email:focus{outline:2px solid #eaff92;outline-offset:2px}
#feedback-hint{display:block;color:#b3d3da;font-size:14px;line-height:1.5;margin-top:5px}
#feedback-privacy,#feedback-status{font-size:14px;line-height:1.6;color:#c3dfe5;overflow-wrap:anywhere}
#feedback-status{color:#eaff92;min-height:22px}
#feedback-submit{width:100%;min-height:52px;margin-top:12px;font-size:18px}
.feedback-trap{position:absolute;left:-10000px;width:1px;height:1px;overflow:hidden}
@media(max-width:400px){#feedback-dialog{padding:18px}.feedback-heading h2{font-size:21px}}