:root{color-scheme:light;--ink:#17181a;--muted:#85858b;--weak:#b5b5b9;--lav:#e9e8ff;--page:#f5f6f7;--white:#fff;--yellow:#ffc52f;--blue:#19b8ea;--blue-soft:#edf7ff;--yellow-soft:#fff8e8;--green:#51c878;--line:#ececee}*{box-sizing:border-box}body{margin:0;background:#e8eaec;color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;letter-spacing:0}button,input,textarea{font:inherit}button{cursor:pointer}.app-shell{width:min(100%,680px);min-height:100vh;margin:auto;background:var(--page);padding-bottom:calc(78px + env(safe-area-inset-bottom));position:relative;overflow:hidden}.view{display:none;min-height:calc(100vh - 78px)}.view.active{display:block;animation:fade .18s ease}@keyframes fade{from{opacity:.45}.to{opacity:1}}.hidden{display:none!important}
.hero-head{background:var(--lav);padding:max(28px,env(safe-area-inset-top)) 16px 22px;display:flex;align-items:center;justify-content:space-between}.subject-tabs{display:flex;gap:24px}.subject-tabs button{border:0;background:transparent;padding:0;color:#7d7d87;font-size:21px}.subject-tabs button.active{font-size:23px;font-weight:700;color:var(--ink)}.grade-select{border:0;background:transparent;display:grid;grid-template-columns:1fr 14px;text-align:left;align-items:center;padding:0}.grade-select span,.grade-select small{display:block;grid-column:1;font-size:13px}.grade-select small{margin-top:2px}.grade-select b{grid-column:2;grid-row:1/3;font-size:18px}.feature-grid{background:linear-gradient(180deg,var(--lav) 0,var(--page) 100%);padding:0 16px 28px;display:grid;grid-template-columns:1fr 1fr;gap:10px}.feature-card{height:100px;border:0;border-radius:16px;background:#fff;display:grid;grid-template-columns:54px 1fr;gap:10px;align-items:center;text-align:left;padding:15px}.feature-card strong{display:block;font-size:18px;white-space:nowrap}.feature-card small{display:block;color:var(--muted);font-size:12px;margin-top:4px;white-space:nowrap}.feature-icon{width:48px;height:48px;border-radius:13px;display:grid;place-items:center;color:#fff;font-size:26px;font-weight:800;position:relative}.feature-icon small{position:absolute!important;right:-5px;bottom:-6px;color:#ffb126!important;font-size:16px!important}.lesson-icon{background:#ffb21c}.words-icon{background:#62d86c}.dictation-icon{background:#19b8ea}.speaking-icon{background:#ff8615;font-size:19px}.content-section,.page-view{padding:0 16px 24px}.section-title-row{display:flex;justify-content:space-between;align-items:center;margin:0 0 14px}.section-title-row h1,.page-header h1{font-size:22px;margin:0}.add-link{border:0;background:transparent;color:#555;font-size:14px}.course-list{display:grid;gap:12px}.course-card{border:0;border-radius:16px;background:#fff;padding:17px;text-align:left;color:inherit;width:100%}.course-card h2{font-size:20px;margin:0 0 13px;line-height:1.35}.preview-tags{display:flex;align-items:center;gap:8px;overflow:hidden;margin-bottom:17px}.preview-tag{background:#f7f7f8;border-radius:8px;padding:10px 11px;font-size:14px;white-space:nowrap;max-width:72%;overflow:hidden;text-overflow:ellipsis}.more-tag{font-size:20px}.course-actions{display:grid;grid-template-columns:1fr 1fr;gap:10px}.course-action{height:43px;border:0;border-radius:999px;font-size:14px;font-weight:650}.course-action.lesson{background:var(--yellow-soft)}.course-action.review{background:var(--blue-soft)}.course-action b{margin-right:6px;color:#fff;border-radius:7px;padding:4px 7px}.course-action.lesson b{background:#ffae13}.course-action.review b{background:var(--blue)}.course-progress{display:flex;justify-content:space-between;margin-top:12px;color:var(--muted);font-size:12px}
.page-view{padding-top:max(26px,env(safe-area-inset-top))}.page-header{display:flex;align-items:center;justify-content:space-between;margin:0 0 20px}.page-header p{margin:0 0 3px;color:var(--muted);font-size:12px}.round-add{width:42px;height:42px;border:0;border-radius:50%;background:var(--yellow);font-size:24px}.search-box{height:46px;background:#fff;border-radius:12px;display:grid;grid-template-columns:40px 1fr;align-items:center;margin-bottom:16px;color:var(--muted)}.search-box span{font-size:22px;text-align:center}.search-box input{border:0;outline:0;background:transparent;padding-right:12px}.count-badge{min-width:42px;height:42px;padding:0 12px;border-radius:21px;background:var(--yellow);display:grid;place-items:center;font-weight:700}.review-filter{display:flex;gap:24px;margin-bottom:14px;border-bottom:1px solid var(--line)}.review-filter button{border:0;background:transparent;padding:8px 0 10px;color:var(--muted)}.review-filter button.active{color:var(--ink);font-weight:700;border-bottom:3px solid var(--yellow)}.review-list{display:grid;gap:12px}.review-card{background:#fff;border-radius:16px;padding:16px}.review-card small{color:var(--muted)}.review-card p{font-size:16px;line-height:1.55;margin:8px 0 14px}.review-actions{display:grid;grid-template-columns:1fr 44px;gap:8px}.review-action,.review-speak{border:0;border-radius:999px;height:42px}.review-action{background:var(--blue-soft);font-weight:650}.review-speak{background:var(--yellow-soft);font-size:17px}.empty-state{text-align:center;background:#fff;border-radius:16px;padding:44px 20px}.empty-state strong{font-size:18px}.empty-state p{color:var(--muted);font-size:14px}.pill-button{border:0;border-radius:999px;padding:11px 22px}.pill-button.primary{background:var(--yellow);font-weight:700}
.profile-hero{background:#fff;border-radius:16px;padding:20px;display:flex;align-items:center;gap:14px}.avatar{width:54px;height:54px;border-radius:50%;background:var(--lav);display:grid;place-items:center;font-size:22px;font-weight:700}.profile-hero h2{font-size:18px;margin:0 0 5px}.profile-hero p{margin:0;color:var(--muted);font-size:13px}.stat-grid{display:grid;grid-template-columns:repeat(3,1fr);background:#fff;border-radius:16px;margin-top:12px;padding:19px 8px}.stat-grid div{text-align:center;border-right:1px solid var(--line)}.stat-grid div:last-child{border:0}.stat-grid strong{display:block;font-size:22px}.stat-grid span{color:var(--muted);font-size:12px}.editor-header{display:grid;grid-template-columns:42px 1fr 42px;align-items:center;margin-bottom:20px}.editor-header h1{font-size:19px;text-align:center;margin:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.back-button,.more-button{border:0;background:transparent;font-size:31px;padding:0}.more-button{font-size:17px}form{display:grid;gap:17px}label span{display:block;font-size:14px;font-weight:650;margin:0 0 7px 2px}input,textarea{width:100%;border:1px solid var(--line);background:#fff;border-radius:12px;padding:13px 14px;outline:0}textarea{resize:vertical;line-height:1.65}input:focus,textarea:focus{border-color:var(--yellow);box-shadow:0 0 0 3px rgba(255,197,47,.18)}.form-note{font-size:12px;color:var(--muted);margin:-5px 2px 0}.save-button{height:49px;border:0;border-radius:999px;background:var(--yellow);font-weight:700}.detail-meta{display:flex;justify-content:space-between;color:var(--muted);font-size:12px}.progress-track{height:6px;background:#e7e7ea;border-radius:3px;overflow:hidden;margin:9px 0 22px}.progress-track i{display:block;height:100%;background:var(--green)}
.knowledge-groups{display:grid;gap:18px}.knowledge-group h3{font-size:18px;margin:0 2px 9px}.knowledge-items{background:#fff;border-radius:16px;overflow:hidden}.vocab-item{display:grid;grid-template-columns:80px 1fr 42px;gap:12px;align-items:center;padding:12px;border-bottom:1px solid var(--line)}.vocab-item:last-child{border:0}.vocab-picture{width:80px;aspect-ratio:1;border-radius:12px;background-image:url("assets/vocabulary-sprite.png");background-size:400% 400%;background-color:#f2f3f3}.vocab-picture.fallback{background-image:none;display:grid;place-items:center;color:var(--blue);font-size:24px;font-weight:700}.vocab-copy{min-width:0}.vocab-copy strong{display:block;font-size:18px;overflow-wrap:anywhere}.vocab-copy span{display:block;color:var(--muted);font-size:14px;margin-top:3px}.vocab-master{border:0;background:transparent;padding:6px 0 0;color:#777;font-size:12px}.vocab-item.mastered .vocab-master{color:var(--green)}.speak-button{width:40px;height:40px;border:0;border-radius:50%;background:var(--yellow-soft);font-size:16px}.knowledge-item{display:grid;grid-template-columns:30px 1fr 42px;align-items:center;gap:8px;padding:14px;border-bottom:1px solid var(--line)}.knowledge-item:last-child{border:0}.item-toggle{display:contents}.checkmark{width:22px;height:22px;border:1.5px solid #bbb;border-radius:50%;display:grid;place-items:center;color:transparent}.knowledge-item.mastered .checkmark{background:var(--green);border-color:var(--green);color:#fff}.item-text{line-height:1.5}.knowledge-item.mastered .item-text{color:var(--muted)}
.bottom-nav{position:fixed;z-index:10;bottom:0;left:50%;transform:translateX(-50%);width:min(100%,680px);height:calc(72px + env(safe-area-inset-bottom));padding:8px 8px env(safe-area-inset-bottom);display:grid;grid-template-columns:repeat(4,1fr);background:rgba(255,255,255,.97);border-top:1px solid var(--line);backdrop-filter:blur(12px)}.nav-item{border:0;background:transparent;color:var(--weak);display:grid;justify-items:center;gap:2px;font-size:11px}.nav-symbol{width:31px;height:31px;border-radius:10px;display:grid;place-items:center;font-size:23px;font-style:normal}.nav-item.active{color:var(--ink)}.nav-item.active .nav-symbol{background:var(--yellow)}.toast{position:fixed;z-index:20;left:50%;bottom:90px;transform:translate(-50%,18px);background:#222;color:#fff;padding:10px 15px;border-radius:8px;font-size:13px;opacity:0;pointer-events:none;transition:.2s}.toast.show{opacity:1;transform:translate(-50%,0)}@media(max-width:360px){.feature-card{grid-template-columns:45px 1fr;padding:12px}.feature-icon{width:42px;height:42px}.feature-card strong{font-size:16px}.subject-tabs{gap:17px}.course-card{padding:14px}}@media(min-width:681px){.app-shell{box-shadow:0 0 40px rgba(30,35,40,.12)}}
.hero-head{display:block;padding:max(30px,env(safe-area-inset-top)) 16px 22px}.hero-head p{margin:0 0 4px;color:#777784;font-size:13px}.hero-head h1{margin:0;font-size:25px}.feature-grid{grid-template-columns:1fr 1fr}
.course-heading{display:flex;align-items:center;gap:12px;margin-bottom:14px}.course-heading h2{margin:0}.course-code{width:54px;height:54px;border-radius:13px;display:grid;grid-template-rows:20px 1fr;place-items:center;background:#e8f5ec;color:#26814e;flex:0 0 auto;overflow:hidden}.course-code small{font-size:11px;align-self:end}.course-code strong{font-size:24px;line-height:1;align-self:start}.course-code.term-暑期{background:#fff0db;color:#e77b17}.course-code.term-秋{background:#eaf4ff;color:#2b7fc3}.course-code.term-寒假{background:#f0eaff;color:#7958bc}.code-only-title{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}.detail-outline{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px;margin-bottom:22px}.detail-outline button{height:58px;border:0;border-radius:12px;background:#fff;display:flex;align-items:center;justify-content:center;gap:7px;color:var(--ink)}.detail-outline span{font-size:14px}.detail-outline strong{min-width:22px;height:22px;border-radius:11px;background:var(--lav);display:grid;place-items:center;font-size:11px}.group-heading{display:flex;align-items:center;justify-content:space-between;margin:0 2px 9px}.group-heading h3{margin:0}.group-heading span{color:var(--muted);font-size:12px}.knowledge-group{scroll-margin-top:14px}
.knowledge-subheading{display:flex;align-items:center;gap:8px;padding:13px 15px;background:#faf9ff;border-bottom:1px solid var(--line);color:#34313d}.knowledge-subheading span{font-size:16px}.knowledge-subheading strong{font-size:15px}
.edit-title-button{border:0;background:var(--yellow-soft);color:#9a6812;font-size:13px;font-weight:700;width:42px;height:34px;border-radius:10px;padding:0}.title-editor{display:grid;grid-template-columns:1fr auto;gap:8px;margin:12px 0}.title-editor input{height:44px}.title-editor>div{display:flex;gap:6px}.title-editor button{border:0;border-radius:10px;padding:0 13px;background:#fff}.title-editor button[type="submit"]{background:var(--yellow);font-weight:700}.delete-course-button{width:100%;height:44px;border:0;background:transparent;color:#c65858;margin-top:24px;font-size:13px}