:root{--hero:#f4faeb;--hero-line:#e2edcf;--heading:#405a2e;--button-shadow:#4c851f;--active-line:#d3e6bd;--path-line:#dbeac7;--note:#fff8e9;--bg:#fff;--surface:#fff;--ink:#35433a;--muted:#748074;--accent:#68a92e;--accent-dark:#558e24;--soft:#f0f8e6;--line:#e2e8dd}.study-brand{color:var(--accent-dark)}.study-brand-mark{border-radius:15px 15px 8px 15px;box-shadow:0 4px 0 var(--button-shadow)}.study-sprout-grid{display:grid;grid-template-columns:1fr 285px;gap:26px;margin-bottom:28px}.study-hero{background:var(--hero);border:2px solid var(--hero-line);border-radius:24px}.study-hero .study-kicker{margin-bottom:10px}.study-home-title{font-size:37px;color:var(--heading)}.study-button{border-width:2px;box-shadow:0 3px 0 var(--line);border-radius:14px}.study-button-primary{box-shadow:0 4px 0 var(--button-shadow);letter-spacing:.5px}.study-button-primary:hover{transform:translateY(-1px)}.study-tabs button[aria-current]{box-shadow:inset 0 0 0 2px var(--active-line)}.study-progress{border:2px solid var(--line);align-self:start}.study-path{display:flex;align-items:center;justify-content:center;padding:22px 0 7px;gap:12px}.study-path button{display:flex;align-items:center;gap:8px;border:0;background:none;font-size:13px;font-weight:600;color:var(--muted);padding:0}.study-path span{display:grid;place-items:center;width:30px;height:30px;border-radius:50%;background:var(--soft);color:var(--accent);border:2px solid var(--path-line)}.study-path i{height:2px;width:22px;background:var(--line)}.study-tool{border:2px solid var(--line);box-shadow:0 4px 0 var(--line)}.study-tool-mistakes .study-symbol{background:#fff3df;color:#c18730}.study-tool-stats .study-symbol{background:#eaf3ff;color:#5289bd}.study-note{background:var(--note)}.study-hero .study-mini{font-size:13px;max-width:300px;margin-top:8px}.study-test-card{border-width:2px}.study-option{box-shadow:0 3px 0 var(--line)}@media(max-width:900px){.study-sprout-grid{grid-template-columns:1fr}.study-progress{width:100%}.study-home-title{font-size:31px}}@media(max-width:650px){.study-path{gap:7px}.study-path button{font-size:12px;gap:5px}.study-path i{width:12px}}

.study-theme-picker{display:flex;align-items:center;gap:9px;font-size:13px;color:var(--muted)}.study-theme-swatches{display:flex;align-items:center;gap:2px}.study-theme-swatch{position:relative;display:grid;place-items:center;width:36px;height:40px;padding:0;background:transparent;border:0;border-radius:10px}.study-theme-swatch:before{content:"";width:24px;height:24px;background:var(--swatch);border-radius:7px;box-shadow:inset 0 0 0 1px #0000000a}.study-theme-swatch:hover{background:var(--soft)}.study-theme-swatch[aria-pressed="true"]:after{content:"";position:absolute;width:9px;height:5px;border-left:2px solid white;border-bottom:2px solid white;transform:translateY(-1px) rotate(-45deg)}.study-header-actions{gap:16px}@media(max-width:650px){.study-theme-picker>span{display:none}.study-theme-picker{gap:0}.study-theme-swatch{width:30px;height:40px}.study-theme-swatch:before{width:21px;height:21px;border-radius:6px}.study-header-actions{gap:8px}.study-brand{font-size:18px;gap:8px}.study-brand-mark{width:33px;height:35px;font-size:20px}}

/* 手机端：保留同一作品和功能，按触屏、窄屏重新排列。 */
.study-hero,.study-hero>div,.study-sprout-grid>div,.study-panel,.study-search{min-width:0}
.study-word-row p,.study-word-row b,.study-mistake-card p,.study-mistake-card small,.study-panel-meta,.study-option,.study-result p{overflow-wrap:anywhere}
.study-dialog{max-height:calc(var(--study-visible-height,100dvh) - 32px);overflow-y:auto;overscroll-behavior:contain;scroll-padding:20px}
.study-toast{bottom:calc(20px + env(safe-area-inset-bottom,0px))}
@media(max-width:650px){
  body{padding-left:env(safe-area-inset-left,0px);padding-right:env(safe-area-inset-right,0px)}
  .study-wrap{padding-inline:18px}
  .study-header-inner{height:auto;min-height:0;display:grid;grid-template-columns:minmax(0,1fr) auto;gap:6px 12px;padding-top:12px;padding-bottom:10px}
  .study-brand{font-size:21px;white-space:nowrap;letter-spacing:-.7px;gap:9px;min-width:0}
  .study-brand-mark{flex-shrink:0;width:34px;height:36px}
  .study-header-actions{display:contents}
  .study-header-actions>.study-button{grid-column:2;grid-row:1;white-space:nowrap;min-height:44px;padding:8px 13px;font-size:14px}
  .study-theme-picker{grid-column:1/-1;grid-row:2;gap:10px;justify-content:flex-end}
  .study-theme-picker>span{display:block;font-size:12px}
  .study-theme-swatches{gap:0}
  .study-theme-swatch{width:44px;height:44px}
  .study-theme-swatch:before{width:24px;height:24px;border-radius:7px}
  .study-tabs{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:3px;padding:16px 0 20px;overflow:visible}
  .study-tabs button{padding:10px 3px;min-height:44px;font-size:13px;border-radius:11px}
  .study-section-label{flex-wrap:wrap;gap:10px;margin:5px 0 16px}
  .study-section-label>div{min-width:0;flex:1 1 180px}
  .study-section-label h2{font-size:22px}
  .study-section-label>span{font-size:12px}
  .study-hero{grid-template-columns:minmax(0,1fr) 100px;padding:22px;gap:10px 6px;border-radius:22px}
  .study-hero>div:first-child{display:contents}
  .study-hero .study-kicker{grid-column:1/-1;margin:0;font-size:12px}
  .study-home-title{grid-column:1;grid-row:2;font-size:28px;line-height:1.4;letter-spacing:-1px}
  .study-hero .study-lead,.study-hero .study-mini,.study-hero .study-button{grid-column:1/-1}
  .study-hero .study-lead{margin-top:0;font-size:15px}
  .study-hero .study-mini{margin:0;max-width:none;font-size:13px}
  .study-hero .study-button{width:100%;margin-top:8px;min-height:48px}
  .study-art{grid-column:2;grid-row:2;min-height:126px;height:126px}
  .study-art-card{position:absolute;width:165px;height:190px;transform:scale(.58) rotate(-8deg);box-shadow:7px 8px 0 #0000000b}
  .study-art-back{transform:scale(.58) rotate(12deg) translate(17px,-5px)}
  .study-spark{font-size:22px;right:-2px;top:0}
  .study-path{justify-content:space-between;gap:4px;padding:18px 0 0}
  .study-path button{min-height:44px;gap:5px;font-size:12px;white-space:nowrap}
  .study-path span{width:26px;height:26px;flex-shrink:0}
  .study-path i{width:10px;flex-shrink:1}
  .study-sprout-grid{gap:22px;margin-bottom:24px}
  .study-progress{padding:22px}
  .study-progress h3{margin-bottom:12px;font-size:18px}
  .study-tools{gap:16px}
  .study-tool{display:grid;grid-template-columns:52px minmax(0,1fr);column-gap:15px;padding:20px;align-items:center}
  .study-tool>.study-symbol{grid-row:1/4;width:52px;height:56px;font-size:27px}
  .study-tool h3{font-size:19px;margin:0 0 3px}
  .study-tool p{font-size:13px}
  .study-tool footer{margin-top:13px;font-size:12px;gap:8px;flex-wrap:wrap}
  .study-list-panel{padding:16px 18px}
  .study-search{min-width:0}
  .study-search input{min-width:0;width:100%;min-height:46px}
  input{font-size:16px}
  .study-word-row{grid-template-columns:20px minmax(0,1fr) 44px;gap:5px 10px;padding:18px 0;align-items:start}
  .study-word-row>span{grid-column:1;grid-row:1;padding-top:5px}
  .study-word-row>div{grid-column:2;grid-row:1;min-width:0}
  .study-word-row strong{font-size:23px;line-height:1.3}
  .study-word-row p{font-size:13px;line-height:1.6;margin-top:5px}
  .study-word-row>b{grid-column:2;grid-row:2;font-size:15px;color:var(--ink)}
  .study-row-delete{grid-column:3;grid-row:1/3;min-width:44px;min-height:44px;padding:8px 0;font-size:13px}
  .study-action-group{width:100%;gap:10px}
  .study-action-group>.study-button{flex:1 1 auto;min-height:46px;font-size:14px;gap:8px;padding:10px 12px}
  .study-section-label>.study-button{min-height:44px}
  .study-test-card{padding:20px;margin:0 auto}
  .study-test-card>.study-overline{margin-top:23px;font-size:14px}
  .study-test-card h2{font-size:clamp(28px,9vw,38px);margin:15px 0 27px}
  .study-test-options{gap:12px}
  .study-option{min-height:60px;padding:14px 16px;font-size:18px;gap:16px}
  .study-option>span{flex-shrink:0}
  .study-test-actions{gap:12px;flex-wrap:wrap;justify-content:flex-end}
  .study-test-actions>.study-text-link{margin-right:auto;min-height:44px}
  .study-feedback{min-height:60px;font-size:15px;line-height:1.6}
  #testPanel>.study-section-label>.study-text-link{min-height:44px;text-align:left}
  .study-result{padding:36px 20px;margin:8px auto}
  .study-result h2{font-size:25px}
  .study-stats-grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:8px}
  .study-stats-grid article{padding:16px 10px;border-radius:14px}
  .study-stats-grid span{font-size:12px}
  .study-stats-grid strong{font-size:29px;margin-top:6px}
  .study-chart-panel{padding:20px 16px}
  .study-week-chart{gap:9px;padding-inline:0}
  .study-chart-bar{width:23px}
  .study-chart-label{white-space:nowrap;font-size:12px}
  .study-dialog{width:calc(100vw - 24px);max-width:calc(100vw - 24px);padding:20px;border-radius:20px;margin:auto;scroll-padding:20px;max-height:calc(var(--study-visible-height,100dvh) - 24px)}
  .study-dialog-head{gap:8px;margin-bottom:18px;align-items:start}
  .study-dialog-head>div{min-width:0}
  .study-dialog h2{font-size:22px;line-height:1.5}
  .study-close{display:grid;place-items:center;min-width:44px;min-height:44px;flex-shrink:0;margin:-9px -9px 0 0}
  .study-dialog input{font-size:16px;min-height:48px;scroll-margin:20px}
  .study-dialog-actions{gap:10px;padding-top:18px;margin-top:20px}
  .study-dialog-actions .study-button{flex:1;gap:8px;padding-inline:12px;min-height:46px;font-size:14px}
  .study-guide-intro{font-size:15px}
  .study-guide-method{font-size:13px;padding:12px}
  .study-guide-steps{padding-left:19px}
  .study-guide-steps>li{padding-left:4px}
  .study-guide-choices{padding-left:17px}
  .study-note>.study-text-link{min-height:44px}
  body>.study-footer{padding-bottom:calc(24px + env(safe-area-inset-bottom,0px))}
}
@media(max-width:360px){
  .study-wrap{padding-inline:14px}
  .study-brand{font-size:19px;gap:7px}
  .study-header-actions>.study-button{font-size:13px;padding-inline:10px}
  .study-tabs button{font-size:12px}
  .study-home-title{grid-column:1/-1;font-size:29px}
  .study-art{display:none}
  .study-path button{font-size:11px}
  .study-path span{width:23px;height:23px}
  .study-path i{width:5px}
  .study-stats-grid span{font-size:11px}
  .study-stats-grid strong{font-size:25px}
}
@media(hover:none){.study-tool:hover{transform:none}.study-button-primary:hover{transform:none}}

/* 手机上用于日常学习，课堂任务与创作引导仅在电脑端显示。 */
@media(max-width:650px){
  [data-action="guide"],.study-note,#guideDialog{display:none!important}
  .study-header-inner>.study-brand{grid-column:1;grid-row:1}
  .study-header-inner{column-gap:8px}
  .study-theme-picker{grid-column:2;grid-row:1;gap:0}
  .study-theme-picker>span{display:none}
  .study-theme-swatch{width:36px;height:44px}
}

/* 开发辅助内容随项目发布状态统一隐藏，覆盖电脑与手机。 */
html[data-study-mode="release"] [data-study-development]{display:none!important}

@media(max-width:360px){.study-theme-swatch{width:30px}.study-brand-mark{width:30px;height:33px}.study-header-inner>.study-brand{font-size:18px}}