:root{--ink:#193e44;--teal:#248d96;--teal-light:#e1f2f0;--paper:#fafcfb;--line:#e1e9e8;--muted:#8b9c9d;--soft:#607a7e;--surface:#e7eeee;--pink:#df8aab;--blue:#86acc9;--panel:334px;font-family:Inter,"Segoe UI","Microsoft YaHei",sans-serif;color:var(--ink);font-synthesis:none}
*{box-sizing:border-box}body{margin:0;background:var(--surface)}button,a,input,select{-webkit-tap-highlight-color:transparent}button,select{font:inherit}button{cursor:pointer}button:disabled{cursor:wait;opacity:.55}button:focus-visible,a:focus-visible,select:focus-visible,input:focus-visible{outline:2px solid var(--teal);outline-offset:3px}button{transition:background .16s,color .16s,box-shadow .16s}svg{height:20px;width:20px;fill:none;stroke:currentColor;stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round;flex-shrink:0}.icon-defs{position:absolute;width:0;height:0}.masthead{height:56px;display:flex;align-items:center;gap:28px;padding:0 26px;background:#163b41;color:#e6f1f1}.brand{display:flex;align-items:center;gap:12px;color:inherit;text-decoration:none;font-size:14px;font-weight:700;letter-spacing:2.3px}.brand svg{color:#8bcfcc;width:22px;height:22px}.masthead-note{font-size:13px;color:#9eb8bb;letter-spacing:1px}.local-badge{margin-left:auto;border:1px solid #527078;padding:5px 9px;font-size:10px;letter-spacing:1.1px;border-radius:3px;color:#b1c9cb;display:flex;align-items:center;gap:7px}.local-badge i,.document-status i,.statusbar i{width:5px;height:5px;background:#85bbb7;border-radius:50%;display:inline-block}.documentbar{height:52px;background:#fcfefd;display:flex;align-items:center;border-bottom:1px solid var(--line);gap:20px;padding:0 22px}.document-tabs{height:100%;display:flex;align-items:stretch;gap:22px}.document-tab{border:0;background:none;color:var(--soft);font-size:13px;padding:0 3px;position:relative;display:flex;align-items:center;gap:8px;white-space:nowrap}.document-tab.active{color:var(--ink);font-weight:650}.document-tab.active:after{content:"";position:absolute;bottom:0;left:0;right:0;height:2px;background:var(--teal)}.tab-dot{height:7px;width:7px;border-radius:50%;display:inline-block}.pink{background:var(--pink)}.blue{background:var(--blue)}.document-meta{border-left:1px solid var(--line);padding-left:20px;font-size:12px;color:#96a6a6;white-space:nowrap}.document-status{margin-left:auto;white-space:nowrap;font-size:12px;display:flex;align-items:center;gap:8px;color:var(--soft)}.document-status i{background:var(--pink)}.workspace{display:grid;grid-template-columns:64px minmax(0,1fr) var(--panel);height:calc(100dvh - 136px);min-height:650px}.toolbar{background:#f5f9f7;border-right:1px solid var(--line);display:flex;align-items:center;flex-direction:column;padding-top:22px;gap:12px;position:relative}.tool{width:38px;height:38px;display:grid;place-items:center;border:1px solid transparent;border-radius:4px;background:transparent;color:#849697}.tool:hover{background:#e6f1ee;color:var(--teal)}.tool.active{background:#daf0ef;border-color:#b8dedc;color:var(--teal);box-shadow:0 1px 4px #45838912}.tool-rule{width:28px;height:1px;background:var(--line);margin:4px 0}.active-color{height:26px;width:26px;border:4px solid #f9fcfa;box-shadow:0 0 0 1px #d4dddd;background:#7898a3;margin-top:4px}.brush-size{text-align:center;font-size:11px;line-height:1.6;color:#8d9e9c;font-variant-numeric:tabular-nums}.brush-size small{font-size:10px}.vertical-label{position:absolute;bottom:24px;writing-mode:vertical-rl;font-size:10px;letter-spacing:1.4px;color:#a2afae}.drawing-surface{min-width:0;min-height:0;display:flex;flex-direction:column;position:relative;background:#e6eeee}.surface-heading,.surface-footer{padding:15px 24px;display:flex;align-items:center;justify-content:space-between;gap:15px;color:#93a7a8;font-size:10px;letter-spacing:1.6px;flex-shrink:0}.surface-footer{font-size:9px;letter-spacing:1.5px;padding-bottom:14px}.canvas-area{flex:1;min-height:0;min-width:0;padding:5px 26px;display:flex;align-items:center;justify-content:center;position:relative;overflow:hidden}.art-frame{position:relative;flex-shrink:0;box-shadow:0 4px 24px #1c454216,0 0 0 1px #ffffff50;background:#f8faf7;max-width:100%;max-height:100%;overflow:hidden}.art-frame canvas{width:100%;height:100%;display:block}.reference-image{max-width:100%;max-height:100%;object-fit:contain;box-shadow:0 4px 22px #1c454224}.reference-image[hidden]{display:none}.pen-cursor{position:absolute;width:12px;height:12px;pointer-events:none;display:none;border:1.5px solid #fff;border-radius:50%;box-shadow:0 0 0 1px #294b4d70;transform:translate(-50%,-50%)}.study-panel{background:var(--paper);padding:26px 24px 18px;border-left:1px solid var(--line);overflow:auto;scrollbar-width:thin;scrollbar-color:#c1d3d1 transparent}.eyebrow{font-size:10px;font-weight:600;letter-spacing:1.8px;color:#9ca9a6}.study-heading h1{font-size:25px;line-height:1.45;letter-spacing:1px;margin:9px 0 5px;font-weight:750}.study-heading p{font-size:12px;color:#829592;margin:0;line-height:1.7}.short-rule{display:block;width:35px;height:3px;background:#84c6c2;margin:15px 0 14px}.stage-list{margin:0;padding:0;list-style:none;display:flex;flex-direction:column;gap:3px}.stage-button{display:flex;align-items:center;gap:11px;width:100%;padding:8px 9px;text-align:left;border:0;border-radius:3px;background:none;font-size:12px;color:#8c9b96;line-height:1.3}.stage-button:hover{background:#ecf5f2}.stage-button.active{background:#dff1ef;color:#266169;font-weight:650}.stage-index{width:20px;height:20px;border:1px solid #dfe9e5;border-radius:50%;font-size:10px;color:#9ab9b0;display:flex;align-items:center;justify-content:center;flex-shrink:0;font-weight:500}.stage-button.active .stage-index{background:var(--teal);color:#fff;border-color:var(--teal)}.stage-button.done .stage-index{color:#6ea9a0;border-color:#cae1d9}.stage-check{margin-left:auto;opacity:0;width:12px;height:12px}.stage-button.done .stage-check{opacity:.55}.stage-note{font-size:11px;color:#82938f;line-height:1.65;border-top:1px solid var(--line);margin-top:13px;padding-top:11px;min-height:52px}.command-card{margin-top:9px;border:1px solid #e4ece6;border-radius:3px;background:#f3f8f5;overflow:hidden}.command-heading{display:flex;align-items:center;justify-content:space-between;gap:6px;background:#f8fbf7;padding:8px 9px;border-bottom:1px solid #e8efea;font-size:8px;letter-spacing:.6px;color:#8b9d92}.command-heading>span{display:flex;align-items:center;gap:6px;white-space:nowrap}.command-heading i{width:10px;height:10px;background:#7898a3;display:inline-block;box-shadow:0 0 0 1px #889d9725}.command-heading code{font-size:9px;letter-spacing:0;color:#6c8680}.command-card pre{font-family:Consolas,"Cascadia Code",monospace;font-size:10px;line-height:1.65;margin:0;padding:10px;color:#6f9d92;min-height:70px;white-space:pre-wrap;overflow-wrap:anywhere}.stroke-meta{display:flex;align-items:center;justify-content:space-between;gap:12px;font-size:10px;color:#9ca9a3;margin:13px 0 11px}.stroke-meta strong{font-variant-numeric:tabular-nums;font-size:10px;color:#6c837d;font-weight:600}.palette{display:flex;gap:5px;height:19px;overflow:hidden}.palette span{width:19px;flex-shrink:0;height:19px;border-radius:2px;box-shadow:inset 0 0 0 1px #7b93901d}.playback{margin-top:21px}.time-row{display:flex;align-items:baseline;justify-content:space-between;font-size:11px;color:#93a59d;font-variant-numeric:tabular-nums}.time-row b{font-size:23px;font-weight:400;color:#617e72;letter-spacing:-.8px}.time-row small{font-size:10px;color:#adb8b1}input[type=range]{appearance:none;-webkit-appearance:none;background:linear-gradient(to right,var(--teal) 0%,var(--teal) var(--progress,100%),#dce7e0 var(--progress,100%),#dce7e0 100%);height:3px;width:100%;display:block;margin:18px 0;cursor:pointer;border-radius:2px}input[type=range]::-webkit-slider-thumb{appearance:none;width:13px;height:13px;background:#319d9e;box-shadow:0 1px 5px #21949544;border-radius:50%}input[type=range]::-moz-range-thumb{width:13px;height:13px;background:#319d9e;border:0;border-radius:50%}.playback-actions{display:flex;gap:7px}.playback-actions button{height:35px;display:flex;align-items:center;justify-content:center;gap:7px;border-radius:3px;border:1px solid #dce7df;background:#fff;color:#8a9c92;font-size:11px;white-space:nowrap}.playback-actions svg{height:15px;width:15px}.playback-actions .icon-button{width:35px;flex-shrink:0}.playback-actions .primary-button{flex:1;background:#218995;border-color:#218995;color:white}.playback-actions .primary-button:hover{background:#197681}.playback-actions .secondary-button{padding:0 9px}.export-actions{display:flex;gap:4px;margin-top:8px;align-items:center}.export-actions button,.export-actions select{height:29px;font-size:10px;border:1px solid #e1e9e2;color:#8c9e93;background:#f9fcf8;border-radius:2px;padding:0 7px;display:flex;align-items:center;justify-content:center;gap:4px;white-space:nowrap}.export-actions button:hover{color:#276f74;background:#e5f2ed}.export-actions button:first-child{flex:1}.export-actions svg{width:12px;height:12px}.export-actions select{max-width:55px;padding-right:0}.playback-hint{font-size:9px;line-height:1.8;color:#a5b2a8;margin:10px 0 0}kbd{font-family:inherit;border:1px solid #dfe8df;border-radius:2px;padding:0 2px;font-size:8px}.statusbar{height:28px;border-top:1px solid #d3dfdc;background:#f4f8f5;display:flex;align-items:center;padding:0 20px;gap:20px;font-size:9px;color:#95a99d;letter-spacing:.3px}.statusbar>span:first-child{display:flex;align-items:center;gap:8px}.footer-right{margin-left:auto;letter-spacing:1.3px;font-size:8px}.toast{position:fixed;bottom:44px;left:50%;transform:translate(-50%,12px);background:#163b41;color:#e6f6f1;box-shadow:0 4px 18px #173f4330;border:1px solid #6baba260;border-radius:4px;padding:11px 18px;font-size:12px;opacity:0;pointer-events:none;transition:opacity .2s,transform .2s;z-index:30;max-width:90vw}.toast.visible{opacity:1;transform:translate(-50%,0)}
@media(min-width:1550px){:root{--panel:354px}.study-panel{padding:29px 28px 20px}.study-heading h1{font-size:28px}.stage-button{padding:10px 9px;font-size:13px}.stage-note{font-size:12px}.playback-hint{font-size:10px}.document-tab{font-size:14px}.study-heading p{font-size:13px}}
@media(max-height:850px) and (min-width:951px){.workspace{min-height:590px}.study-panel{padding-top:18px}.study-heading h1{font-size:23px;margin-top:6px}.short-rule{margin:11px 0 8px}.stage-button{padding:6px 8px}.stage-note{min-height:39px;font-size:10px;padding-top:8px;margin-top:9px}.command-card{margin-top:5px}.command-card pre{padding:7px 10px;min-height:60px}.stroke-meta{margin:10px 0 8px}.playback{margin-top:14px}.playback-hint{margin-top:7px}}
@media(max-width:1150px){:root{--panel:302px}.study-panel{padding-left:20px;padding-right:20px}.document-meta{display:none}.canvas-area{padding:3px 18px}.study-heading h1{font-size:23px}}
@media(max-width:950px){.masthead{padding:0 18px;gap:18px;height:52px}.local-badge{font-size:8px}.masthead-note{font-size:11px}.documentbar{padding:0 18px;gap:10px;height:52px}.document-tabs{gap:18px}.document-tab{font-size:12px}.document-status{display:none}.workspace{height:auto;min-height:0;grid-template-columns:48px minmax(0,1fr);grid-template-rows:minmax(500px,calc(100svh - 155px)) auto}.toolbar{padding-top:17px;grid-row:1;gap:10px}.tool{height:32px;width:32px}.drawing-surface{grid-column:2;grid-row:1}.study-panel{grid-column:1/-1;display:grid;grid-template-columns:1fr 1fr;column-gap:26px;padding:24px;border-left:0;border-top:1px solid #d1e0da;overflow:visible}.study-heading{grid-column:1}.stage-list{grid-column:1;grid-row:2/7}.stage-note{grid-column:2;grid-row:1;margin-top:12px;border:0;align-self:end}.command-card{grid-column:2;grid-row:2}.stroke-meta{grid-column:2;grid-row:3}.palette{grid-column:2;grid-row:4}.playback{grid-column:2;grid-row:5/8}.stage-button{padding:9px;font-size:12px}.statusbar{font-size:8px;padding:0 12px}.footer-right{display:none}.canvas-area{padding:3px 18px 7px}.surface-heading,.surface-footer{padding-left:18px;padding-right:18px}}
@media(max-width:550px){.masthead-note{display:none}.brand{font-size:12px}.local-badge{letter-spacing:.4px}.documentbar{padding:0 12px}.document-tabs{gap:16px}.document-tab{font-size:11px;gap:6px}.workspace{grid-template-columns:42px 1fr;grid-template-rows:minmax(420px,calc(100svh - 185px)) auto}.toolbar{gap:8px}.tool{width:31px;height:31px}.canvas-area{padding:2px 12px}.surface-heading,.surface-footer{font-size:8px;letter-spacing:.7px;padding:14px 12px}.surface-footer>span:first-child{max-width:165px}.study-panel{display:block;padding:24px}.study-heading h1{font-size:26px}.stage-list{display:grid;grid-template-columns:1fr 1fr;gap:4px}.stage-button{font-size:11px;padding:9px 5px;gap:8px}.stage-check{display:none}.stage-note{min-height:35px}.command-card pre{font-size:12px}.command-heading{font-size:9px}.stroke-meta{font-size:12px}.stroke-meta strong{font-size:12px}.palette{height:24px}.palette span{height:24px;width:24px}.playback{margin-top:22px}.playback-actions button{height:42px;font-size:13px}.export-actions button,.export-actions select{height:35px;font-size:11px}.playback-hint{font-size:11px;margin-top:13px}.statusbar{font-size:8px;gap:10px}.brush-size{font-size:10px}.vertical-label{font-size:8px}}
.loading-state{position:absolute;inset:0;z-index:3;display:flex;align-items:center;justify-content:center;flex-direction:column;gap:16px;padding:24px;background:#e7eeeeed;color:#50797d;font-size:14px;text-align:center}.loading-state[hidden]{display:none}.loading-state button{border:1px solid #9bc5c3;border-radius:4px;background:#fafcfb;color:#24818a;font-size:13px;padding:8px 18px}.loading-state button[hidden]{display:none}
@media(prefers-reduced-motion:reduce){*{transition:none!important}}