.nt-page .wrap{max-width:900px;padding-top:12px}.nt-page header{padding:9px 0 12px}.nt-hero{display:flex;align-items:center;justify-content:space-between;gap:15px;padding:17px 22px!important;margin:14px 0 10px!important}.nt-hero h1{font-size:30px!important;margin:3px 0!important}.nt-hero p{font-size:14px;margin:4px 0}.nt-help{background:#fff;color:#174c91;margin:0;white-space:nowrap;font-size:13px;padding:9px 13px}.nt-help-panel{padding:16px 20px}.nt-help-panel h2{margin:0 0 8px}.nt-help-panel p{margin:8px 0;font-size:14px}.nt-example{background:#eef5ff;border-radius:10px;padding:12px 14px;line-height:1.8;font-size:14px}.nt-game{padding:20px 22px;margin:10px 0}.nt-head{display:flex;justify-content:space-between;gap:15px;align-items:center}.nt-small{font-size:12px}.nt-target{display:flex;align-items:baseline;gap:12px}.nt-target span{font-size:13px;font-weight:800;color:#527394}.nt-target strong{font-size:42px;line-height:1.2;color:#164f91}.nt-timer{display:flex;flex-direction:column;align-items:flex-end}.nt-timer span{font-size:11px}.nt-timer strong{font-size:27px;font-variant-numeric:tabular-nums;color:#155aa6}.nt-timer strong.expired{color:#c22e3e}.nt-bar{background:#e6eef8;height:7px;border-radius:20px;overflow:hidden;margin:10px 0}.nt-bar span{display:block;height:100%;background:#1e75c9;transition:width .3s}.nt-status{font-size:14px;color:#536c88;margin:10px 0}.nt-tiles{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:10px}.nt-tile{margin:0;background:#e8f2ff;color:#123f70;border:2px solid #c4daf5;border-radius:12px;font-size:23px;font-weight:800;min-height:67px;padding:8px 3px;overflow-wrap:anywhere}.nt-tile.picked,.nt-tile.final{border-color:#1a63b0;background:#c9e2ff}.nt-tile:disabled{opacity:.75;cursor:default}.nt-ops{display:flex;justify-content:center;gap:9px;margin:14px 0 4px}.nt-ops button{margin:0;min-width:56px;min-height:48px;font-size:23px;background:#174e91}.nt-ops button.picked{background:#e8a32e;color:#132e4a}.nt-ops button:disabled{opacity:.4}.nt-actions{display:flex;justify-content:center;gap:8px;flex-wrap:wrap}.nt-actions button{margin:7px 0 0;font-size:14px;padding:10px 14px}.nt-actions button:disabled{opacity:.45;cursor:not-allowed}.nt-result{background:#e7f8ed;border:1px solid #a4d6b5;border-radius:10px;padding:12px;margin-top:14px}.nt-result p{margin:5px 0}.nt-game>.muted{margin-bottom:0;margin-top:15px;line-height:1.5}@media(max-width:600px){.nt-page .wrap{padding:9px 10px 18px}.nt-hero{padding:12px 14px!important;align-items:flex-start}.nt-hero h1{font-size:24px!important}.nt-hero p{font-size:12px}.nt-help{font-size:11px;padding:8px}.nt-game{padding:13px 11px}.nt-target strong{font-size:34px}.nt-timer strong{font-size:24px}.nt-tiles{gap:5px}.nt-tile{min-height:52px;font-size:17px;border-radius:8px}.nt-ops{gap:7px}.nt-ops button{min-width:48px}.nt-actions button{flex:1 1 40%;padding:10px 6px}.nt-help-panel{padding:13px}}

/* V2 visible calculation builder and editable history */
.nt-builder{border:1px solid #bdd7f3;background:#f0f7ff;border-radius:12px;padding:13px 15px;margin:13px 0}.nt-builder-top,.nt-history-head{display:flex;align-items:center;justify-content:space-between;gap:8px;flex-wrap:wrap}.nt-builder-top strong,.nt-history-head strong{font-size:14px;color:#164f91}.nt-builder-top span,.nt-history-head span{font-size:12px;color:#607a94}.nt-equation{display:flex;align-items:center;justify-content:center;gap:8px;margin:13px 0 9px;flex-wrap:wrap}.nt-part{min-width:80px;min-height:52px;display:flex;align-items:center;justify-content:center;background:white;border:2px solid #93bce8;border-radius:9px;font-size:22px;font-weight:800;color:#164f91}.nt-part-op{min-width:54px;background:#e4eefb}.nt-placeholder{border-style:dashed;color:#91a8c2}.nt-preview{text-align:center;font-size:13px;color:#516f90;min-height:20px}.nt-history{border:1px solid #d8e5f4;border-radius:12px;padding:12px 14px;margin:12px 0}.nt-steps{display:grid;gap:6px;margin-top:9px}.nt-steps>.muted{font-size:13px}.nt-step{display:flex;align-items:center;gap:10px;background:#f5f9fe;padding:6px 10px;border-radius:8px}.nt-step-number{font-size:12px;color:#67819c}.nt-step strong{font-size:15px;flex:1}.nt-edit{font-size:12px;padding:5px 11px;margin:0;background:#e0edfc;color:#17569a}.nt-tile{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px}.nt-tile small{font-size:9px;letter-spacing:.4px;color:#5d7897}.nt-status{margin:9px 0}.nt-tiles{grid-template-columns:repeat(6,minmax(0,1fr))}@media(max-width:600px){.nt-builder{padding:10px}.nt-part{min-width:67px;min-height:45px;font-size:19px}.nt-part-op{min-width:43px}.nt-history{padding:10px}.nt-tiles{grid-template-columns:repeat(3,minmax(0,1fr))}.nt-tile{min-height:53px}.nt-history-head span{font-size:11px}}

/* V3: compact responsive workspace */
.nt-page .wrap{max-width:1100px}.nt-game{padding:14px 16px;margin:10px 0}.nt-hero{padding:13px 20px!important}.nt-hero h1{font-size:27px!important}.nt-hero p{margin:0}.nt-head{display:grid;grid-template-columns:1fr 1.15fr .85fr;gap:10px;align-items:stretch}.nt-stat{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;background:#eff6ff;border:1px solid #c8ddf6;border-radius:10px;padding:9px 8px;min-width:0}.nt-stat-label{font-size:10px;font-weight:800;color:#577597;letter-spacing:.7px}.nt-stat strong{font-size:31px;color:#154d91;line-height:1.15}.nt-stat .nt-small{font-size:10px}.nt-time-stat strong{font-variant-numeric:tabular-nums}.nt-time-stat span#timeStatus,.nt-score-stat span:last-child{font-size:10px;color:#607b99;text-align:center}.nt-bar{height:5px;width:92%;margin:3px 0 0}.nt-workspace{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(0,1fr);grid-template-areas:'play history';gap:12px;margin-top:12px;align-items:start}.nt-play-area{grid-area:play;min-width:0}.nt-history{grid-area:history;margin:0;padding:11px;min-height:190px}.nt-builder{margin:0 0 9px;padding:9px 11px}.nt-builder-top strong,.nt-history-head strong{font-size:14px}.nt-builder-top span{font-size:11px}.nt-equation{margin:7px 0 3px;gap:5px;flex-wrap:nowrap}.nt-part{min-width:0;flex:1;min-height:35px;font-size:17px;border-width:1px;border-radius:7px;white-space:nowrap}.nt-part-op{flex:0 0 42px}.nt-preview{min-height:0;font-size:11px;line-height:1.4}.nt-section-heading{display:flex;justify-content:space-between;gap:10px;align-items:center;color:#164f91;font-size:13px}.nt-section-heading span{font-size:11px;color:#69809c}.nt-status{font-size:12px;margin:4px 0 7px}.nt-tiles{grid-template-columns:repeat(3,minmax(0,1fr));gap:7px}.nt-tile{min-height:53px;font-size:21px;border-radius:9px}.nt-ops{margin:9px 0 4px;gap:7px}.nt-ops button{min-width:0;flex:1;min-height:42px;padding:5px;font-size:22px}.nt-actions{gap:6px}.nt-actions button{flex:1 1 auto;margin:4px 0 0;padding:9px 8px;font-size:12px}.nt-actions #submit{background:#0c63b8}.nt-step{padding:5px 7px;gap:6px}.nt-step strong{font-size:13px}.nt-edit{padding:5px 8px}.nt-history-head span{font-size:11px}.nt-rules{margin-top:12px!important;font-size:11px}.nt-result{margin-top:10px}.nt-help{font-size:12px}.nt-tile:focus-visible,.nt-ops button:focus-visible{outline:3px solid #ffac33;outline-offset:2px}
@media(max-width:750px){.nt-workspace{grid-template-columns:1fr;grid-template-areas:'play' 'history'}.nt-history{min-height:0}.nt-tiles{grid-template-columns:repeat(3,minmax(0,1fr))}.nt-head{gap:6px}.nt-stat{padding:8px 3px}.nt-stat strong{font-size:25px}.nt-score-stat strong{font-size:25px}.nt-game{padding:11px}.nt-hero{padding:12px 13px!important}.nt-hero h1{font-size:24px!important}.nt-hero p{font-size:12px}.nt-actions button{flex:1 1 27%}}
@media(max-width:400px){.nt-stat strong{font-size:22px}.nt-stat-label{font-size:9px}.nt-score-stat span:last-child{font-size:9px}.nt-part{font-size:15px}.nt-part-op{flex-basis:32px}.nt-help{padding:7px;font-size:10px}.nt-hero h1{font-size:21px!important}}

/* V4 ultra-compact layout: preserve V3 game logic */
.nt-game{padding:10px 13px!important}
.nt-head{gap:7px}
.nt-stat{padding:5px 7px;gap:0;min-height:62px;border-radius:8px}
.nt-stat-label{font-size:9px;line-height:1.15}
.nt-stat strong{font-size:25px;line-height:1.12}
.nt-stat .nt-small,.nt-time-stat span#timeStatus,.nt-score-stat span:last-child{font-size:9px;line-height:1.2}
.nt-bar{height:3px;margin:2px 0 0}
.nt-workspace{margin-top:8px;gap:9px;grid-template-columns:minmax(0,1.2fr) minmax(0,1fr)}
.nt-builder{padding:5px 8px;margin:0 0 7px;border-radius:8px;display:grid;grid-template-columns:auto minmax(0,1fr);align-items:center;gap:3px 10px;min-height:0}
.nt-builder-top{display:contents}
.nt-builder-top strong{font-size:12px;white-space:nowrap}
.nt-builder-top #builderHint{display:none}
.nt-equation{margin:0;gap:4px;min-width:0;justify-content:flex-end}
.nt-part{flex:0 1 100px;min-height:29px;font-size:14px;border-radius:5px;padding:2px 4px}
.nt-part-op{flex:0 0 31px}
.nt-preview{grid-column:1/-1;font-size:10px;line-height:1.25;text-align:right;min-height:0;margin:0}
.nt-history{padding:7px 9px;min-height:0;border-radius:9px}
.nt-history-head strong{font-size:12px}
.nt-history-head span{font-size:10px}
.nt-steps{gap:3px;margin-top:5px}
.nt-step{padding:2px 5px;min-height:29px;gap:5px;border-radius:5px}
.nt-step strong{font-size:12px;line-height:1.15}
.nt-step-number{font-size:10px}
.nt-edit{font-size:10px;padding:4px 7px;border-radius:5px}
.nt-section-heading{font-size:12px}
.nt-status{font-size:11px;margin:2px 0 5px}
.nt-tiles{gap:5px}
.nt-tile{min-height:44px;font-size:18px;border-radius:7px;padding:4px}
.nt-tile small{font-size:8px}
.nt-ops{margin:6px 0 3px;gap:5px}
.nt-ops button{min-height:35px;font-size:20px;border-radius:6px}
.nt-actions{gap:5px}
.nt-actions button{padding:7px 6px;font-size:11px;margin:2px 0 0}
.nt-rules{font-size:10px;margin-top:8px!important}
.nt-distance{font-size:11px;color:#175a98;font-weight:700;margin:5px 0 0}
@media(max-width:750px){.nt-head{gap:5px}.nt-stat{padding:5px 2px;min-height:59px}.nt-stat strong{font-size:22px}.nt-workspace{grid-template-columns:1fr}.nt-builder{grid-template-columns:auto minmax(0,1fr)}.nt-history{margin-top:0}}
@media(max-width:400px){.nt-stat strong{font-size:20px}.nt-stat-label{font-size:8px}.nt-part{font-size:12px}.nt-part-op{flex-basis:26px}.nt-builder{gap:3px 5px}}