:root{color-scheme:light;--bg:#f3f8f5;--paper:#fff;--ink:#1b402b;--sub:#527e65;--line:#dfece5;--brand:#409464;--soft:#f2f7f4;--danger:#a62b30;--good:#20745a;font:16px/1.65 'Microsoft YaHei','Segoe UI',sans-serif;color:var(--ink);background:var(--bg)}*{box-sizing:border-box}body{margin:0}button,input,select,textarea{font:inherit}button,a{touch-action:manipulation}button,.button{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:1px solid var(--line);border-radius:8px;background:var(--paper);color:var(--ink);padding:9px 16px;min-height:44px;cursor:pointer;text-decoration:none}button:hover,.button:hover{border-color:var(--brand);background:var(--soft)}button.primary,.button.primary{background:var(--brand);color:white;border-color:var(--brand)}button.danger{color:var(--danger)}button:disabled{opacity:.55;cursor:wait}button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,a:focus-visible{outline:3px solid #97d3b1;outline-offset:2px}input:not([type=checkbox]):not([type=radio]),select,textarea{width:100%;padding:10px 12px;border:1px solid var(--line);border-radius:8px;background:white;color:var(--ink)}input[type=checkbox],input[type=radio]{accent-color:var(--brand);width:19px;height:19px;flex-shrink:0}textarea{min-height:110px;resize:vertical}h1{font-size:28px;line-height:1.4;margin:0 0 8px}h2{font-size:20px;margin:0 0 16px}h3{font-size:17px;margin:0 0 10px}p{margin:8px 0}a{color:var(--brand)}.top{display:flex;justify-content:space-between;gap:20px;align-items:center;padding:18px 30px;background:var(--paper);border-bottom:1px solid var(--line);flex-wrap:wrap}.brand{display:flex;align-items:center;gap:12px;font-size:20px;font-weight:600}.brand img{width:38px;height:38px}.top .tools{display:flex;align-items:center;gap:12px;flex-wrap:wrap}.layout{display:grid;grid-template-columns:210px minmax(0,1fr);max-width:1600px;margin:auto;min-height:calc(100vh - 90px)}nav{padding:26px 16px;background:var(--paper);border-right:1px solid var(--line)}nav button{display:flex;justify-content:flex-start;text-align:left;width:100%;border:0;background:none;margin:5px 0}nav button.active{background:var(--soft);color:var(--brand);font-weight:600}nav .section{margin:20px 14px 8px;color:var(--sub);font-size:13px}main{padding:30px;min-width:0}.heading,.row{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap}.heading{margin-bottom:24px}.muted{color:var(--sub);font-size:14px}.panel{background:var(--paper);border:1px solid var(--line);border-radius:12px;padding:24px;margin-bottom:20px;min-width:0}.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(290px,100%),1fr));gap:20px}.grid>.panel{margin-bottom:0}.columns{display:grid;grid-template-columns:minmax(0,1.3fr) minmax(250px,1fr);gap:20px}.actions{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-top:18px}.tag{display:inline-block;padding:3px 10px;border-radius:5px;font-size:13px;background:var(--soft);color:var(--brand)}.tag.warn{color:#855513;background:#fff1d9}.tag.good{color:var(--good);background:#e7f5ed}.notice{background:var(--soft);border-radius:8px;padding:14px 18px;margin:15px 0;font-size:14px}.error{color:var(--danger);background:#fff0f0;border-radius:8px;padding:12px;margin:12px 0}.field{display:block;margin-bottom:18px}.field>span{display:block;margin-bottom:6px}.option{display:flex;align-items:flex-start;gap:10px;padding:12px;border:1px solid var(--line);border-radius:8px;margin-top:10px;min-height:46px}.option:has(input:checked){background:var(--soft);border-color:var(--brand)}.question{padding:22px 0;border-bottom:1px solid var(--line);overflow-wrap:anywhere}.question:first-child{padding-top:0}.question:last-child{border-bottom:0}.question img,.answer-image{max-width:100%;max-height:450px;object-fit:contain;display:block;margin:12px 0;border-radius:8px}.question .label{display:flex;align-items:center;justify-content:space-between;margin-bottom:12px;gap:12px}.pre{white-space:pre-wrap;overflow-wrap:anywhere}.tablewrap{overflow-x:auto}table{width:100%;border-collapse:collapse;text-align:left}th,td{border-bottom:1px solid var(--line);padding:13px 10px;font-size:14px;vertical-align:top}th{font-weight:500;color:var(--sub)}td button{padding:6px 10px;margin:2px;font-size:14px}code{font-family:ui-monospace,Consolas,monospace}.code{font-size:32px;letter-spacing:6px;font-weight:600;font-variant-numeric:tabular-nums}.empty{padding:36px 12px;color:var(--sub);text-align:center}.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-bottom:20px}.stat{background:var(--paper);border:1px solid var(--line);border-radius:10px;padding:18px}.number{font-size:28px;font-weight:600}.bar{height:10px;background:var(--bg);margin:9px 0;border-radius:6px;overflow:hidden}.bar>span{display:block;height:100%;background:var(--brand)}.login{max-width:470px;margin:8vh auto;padding:24px}.login .panel{padding:32px}.login .brand{margin-bottom:26px}.loading{padding:50px;text-align:center}.log{max-height:480px;overflow-y:auto;margin:20px 0}.bubble{padding:14px 18px;background:var(--bg);border-radius:10px;max-width:88%;margin:12px 0;overflow-wrap:anywhere}.bubble.mine{margin-left:auto;background:var(--soft)}.small{font-size:13px}.statusline{color:var(--sub);font-size:14px;padding:12px 0;min-height:44px}#toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%);background:var(--ink);color:white;border-radius:9px;padding:13px 24px;max-width:90%;display:none;z-index:20}.dangertext{color:var(--danger)}.student .layout{grid-template-columns:1fr;max-width:1100px}.student nav{border-right:0;border-bottom:1px solid var(--line);display:flex;flex-wrap:wrap;gap:4px;padding:10px 24px}.student nav button{width:auto;margin:0}.student nav .section{display:none}progress{width:100%;accent-color:var(--brand)}.checkrow{display:flex;gap:10px;align-items:center}.secret{background:#fff7e7;padding:18px;border-radius:8px;overflow-wrap:anywhere}.footer{font-size:12px;color:var(--sub);margin-top:25px}.stamp{border-left:3px solid var(--brand);padding-left:14px}.listitem{padding:16px 0;border-bottom:1px solid var(--line)}.listitem:last-child{border:0}details>summary{cursor:pointer;padding:8px 0;color:var(--brand)}
@media(max-width:800px){.layout{grid-template-columns:1fr}nav{border-right:0;border-bottom:1px solid var(--line);display:flex;flex-wrap:wrap;padding:10px;gap:3px}nav button{width:auto;margin:0;padding:9px 12px}nav .section{display:none}main{padding:18px}.top{padding:15px 18px}.columns{grid-template-columns:1fr}.panel{padding:18px}.heading{align-items:flex-start}.stats{gap:9px}.stat{padding:12px}.number{font-size:24px}h1{font-size:24px}.top .tools{gap:8px}.login{margin:20px auto}.bubble{max-width:96%}.code{font-size:27px}}

.word-image{max-width:100%;max-height:380px;object-fit:contain;vertical-align:middle;margin:8px 4px}.word-math{font-size:1.2em;margin:0 .2em;vertical-align:middle;max-width:100%;overflow-x:auto}.question h3{overflow-wrap:anywhere}

.panel.low-rate{border:2px solid #c62828;background:#fff5f5}.low-rate .rate-label{color:#b71c1c}.low-rate progress{accent-color:#c62828}

.heart{color:#d81b60;font-size:1.25em;font-weight:700}.reward-icons{display:inline-flex;flex-wrap:wrap;gap:8px;align-items:center}.reward-icons>span{white-space:nowrap}.coin{border-radius:15px;padding:3px 8px;font-weight:700}.coin.gold{background:#ffedaf;color:#765000;border:1px solid #d8a500}.coin.silver{background:#edf3f0;color:#466855;border:1px solid #aec5b8}.my-ranking{background:#f4f9f6}.reward-rule{padding:12px;background:#fff6e3;border-radius:10px;line-height:1.9}.ranking-table td{vertical-align:middle}.ranking-table{min-width:520px}

@media(max-width:600px){.ranking-table{min-width:0;width:100%;display:block}.ranking-table thead{display:none}.ranking-table tbody{display:block}.ranking-table tr{display:grid;grid-template-columns:32px minmax(0,1fr) 48px;border-radius:10px;border:1px solid #e0ece5;margin:8px 0;padding:8px}.ranking-table td{display:block;padding:6px;border:0}.ranking-table td:nth-child(3)::after{content:"分";font-size:12px}.ranking-table td:nth-child(4){grid-column:2 / 4}.ranking-table td:nth-child(4)::before{content:"累计奖励";display:block;color:#648b75;font-size:12px;margin-bottom:5px}}

.chart-frame{max-width:100%;overflow-x:auto;overscroll-behavior-x:contain;padding-top:8px}.correct-rate-chart{display:block;font-family:inherit}.chart-grid{stroke:#dfece5;stroke-width:1}.chart-tick{fill:#476956;font-size:12px}.chart-small{fill:#648b75;font-size:10px}.chart-bar.normal{fill:#58b881}.chart-bar.low{fill:#dc2626}.chart-bar.pending{fill:#e4eee8;stroke:#94b8a3;stroke-dasharray:3 2}.chart-value{font-size:12px;font-weight:700;fill:#4aab74}.chart-value.low{fill:#b91c1c}.chart-value.pending{fill:#648b75}.chart-threshold{stroke:#b91c1c;stroke-width:1.5;stroke-dasharray:6 4;pointer-events:none}.threshold-label{fill:#b91c1c;font-size:11px;pointer-events:none}.chart-legend{display:flex;flex-wrap:wrap;gap:16px;font-size:13px}.legend-blue{color:#58b881}.legend-red{color:#dc2626}.legend-gray{color:#648b75}.correct-rate-chart a:hover .chart-bar,.correct-rate-chart a:focus .chart-bar{opacity:.75;stroke:#11281b;stroke-width:2}[id^="stats-q-"]{scroll-margin-top:20px}

[data-pick-id][hidden]{display:none}

.word-table-wrap{display:block;max-width:100%;overflow-x:auto;margin:12px 0;white-space:normal}.word-table{width:100%;border-collapse:collapse;font-size:15px;font-weight:400;line-height:1.6}.word-table td{border:1px solid #94b8a3;padding:8px;white-space:pre-wrap;min-width:65px;vertical-align:top}.word-table tr:first-child{background:#f1f6f3;font-weight:600}

.folder-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:16px}.folder-card{display:flex;flex-direction:column;align-items:flex-start;gap:10px;text-align:left;padding:22px;background:white;border:1px solid #dfece5;border-radius:14px;min-height:155px;overflow-wrap:anywhere}.folder-card:hover{border-color:#58b881;background:#f9fbfa}.folder-icon{font-size:34px}.folder-card strong{font-size:18px}.bank-upload>summary{font-size:18px;font-weight:600;cursor:pointer}.bank-upload>.panel{margin-top:18px;box-shadow:none}

.material-group{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:20px;margin:20px 0;align-items:start}.material-reader{position:sticky;top:12px;border:1px solid #cce0d5;border-radius:12px;padding:16px;max-height:75vh;overflow:auto;background:#f9fbfa}.material-reader summary{font-weight:700;cursor:pointer}.passage-text{font-size:17px;line-height:1.9;margin-top:12px;overflow-wrap:anywhere}.material-questions{min-width:0;max-height:80vh;overflow:auto;padding:4px}.gap-button{display:inline;padding:2px 8px;min-width:70px;margin:0 3px;border:1px solid #58b881;color:#398459;max-width:100%;overflow-wrap:anywhere}.gap-button.answered{background:#e8f1ec}.material-details{border-left:3px solid #bad6c6;padding:10px;margin:10px 0}.material-details summary{cursor:pointer}.material-details .pre{max-height:50vh;overflow:auto;line-height:1.8}@media(max-width:850px){.material-group{display:block}.material-reader{position:static;max-height:42vh;margin-bottom:12px}.material-questions{max-height:none;overflow:visible}.passage-text{font-size:16px}}

button[data-act="dissolve-course"]{font-size:12px;line-height:1.5;padding:4px 6px;min-height:28px;margin-left:12px;border-color:transparent;background:transparent;color:#8b6262;vertical-align:middle}
button[data-act="dissolve-course"]:hover{color:#b91c1c;background:#fff1f2;border-color:transparent}
#dissolve-course-form button[type=submit]{color:#b91c1c;border-color:#fca5a5;background:#fff1f2;margin-left:8px}

.entry-layout{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:40px 24px;background:radial-gradient(ellipse at top left,#e7f1eb,transparent 60%),#f6faf8}.entry-login{width:440px;max-width:100%}.entry-login .panel{padding:32px}.entry-login h1{font-size:25px;margin-top:24px}.entry-login .brand img{width:40px;height:40px}.teacher-entry{gap:7vw}.entry-intro{max-width:510px;padding:24px 0}.entry-eyebrow{letter-spacing:3px;color:#409464;font-size:14px}.entry-intro h1{font-size:42px;line-height:1.45;margin:24px 0;color:#1e4730}.entry-intro>p{font-size:17px;color:#527e65;max-width:440px}.entry-features{display:grid;gap:18px;margin:35px 0}.entry-features div{border-left:3px solid #85cba3;padding-left:16px}.entry-features b,.entry-features span{display:block}.entry-features span{font-size:14px;color:#527e65;margin-top:3px}.entry-intro .entry-sign{font-size:14px;letter-spacing:4px;margin-top:48px}.entry-help{font-size:13px;color:#527e65;margin-top:22px}.entry-link{font-size:13px;color:#409464}@media(max-width:850px){.teacher-entry{display:block;padding:24px 18px}.entry-intro{max-width:100%;padding:0}.entry-intro h1{font-size:27px;margin:12px 0}.entry-features,.entry-intro .entry-sign{display:none}.entry-intro>p{font-size:14px;margin-bottom:20px}.entry-login{margin:auto;width:480px}.entry-login .panel{padding:24px}}

/* Soft green depth; white reading surfaces stay clear for long passages. */
:root{--bg:#f2f7f4;--ink:#1d452e;--sub:#528568;--brand:#56b67f;--soft:#f4f8f6;--line:#e2ede7}
body{background:radial-gradient(ellipse at 92% 0%,#e5f0ea 0,transparent 42%),radial-gradient(ellipse at 0% 50%,#edf4f0 0,transparent 40%),#f6f9f7;background-attachment:fixed}
.top{background:linear-gradient(115deg,#1f4831,#337750 65%,#347952);color:#fff;border:0;box-shadow:0 8px 28px #26583b24;padding:20px 32px}
.top .muted{color:#e9f2ec}.top .tools button{background:#ffffff12;color:white;border-color:#ffffff35}.top .tools button:hover{background:#ffffff25}.brand img{border-radius:12px;box-shadow:0 5px 12px #18392633}.brand{letter-spacing:.5px}.top .tag.warn{background:#fff2d9;color:#76521b}
.layout{gap:0}nav{background:linear-gradient(180deg,#fff,#f7fbf9);border-right:1px solid #e2ede7;padding-top:28px}nav button{border-radius:12px;padding:13px 16px;color:#528166;transition:background .15s,box-shadow .15s}nav button.active{color:#fff;background:linear-gradient(120deg,#56b67f,#66be8c);box-shadow:0 5px 12px #56b67f2e}nav button:hover:not(.active){background:#f1f6f3}
main{padding:30px 34px}.heading h1{letter-spacing:.3px}.heading{margin-bottom:24px}.panel,.stat{border:1px solid #e3eee8;border-radius:18px;box-shadow:0 8px 24px #32744e10,0 2px 4px #32744e05;background:#fff}.grid>.panel{border-top:3px solid #89cca6}.panel.low-rate{border-color:#e35460;border-top-color:#e35460}.stat{background:linear-gradient(145deg,#fff,#f8fbf9)}.number{color:#429967;font-variant-numeric:tabular-nums}
button,.button{border-radius:11px;transition:box-shadow .15s,background .15s;box-shadow:0 2px 3px #2e6b4807}button.primary,.button.primary{background:linear-gradient(125deg,#56b67f,#62bc89);border-color:#55b67f;box-shadow:0 4px 10px #56b67f24}button.primary:hover,.button.primary:hover{background:#49ab73;box-shadow:0 6px 14px #56b67f32}button:active,.button:active{transform:translateY(1px)}
.notice{border:1px solid #e7f0eb;background:linear-gradient(110deg,#f4f8f6,#f9fbfa);border-radius:12px}.tag{border-radius:7px}.folder-card{border-radius:17px;background:linear-gradient(145deg,#fff,#f6f9f7);box-shadow:0 7px 18px #2e6b4810;border:1px solid #e0ede6}.folder-card:hover{box-shadow:0 10px 25px #2e6b481c}.option{border-radius:12px}.option:has(input:checked){box-shadow:inset 3px 0 #66bd8b}.page-back{display:flex;align-items:center;gap:12px;margin-bottom:20px}.page-back button{font-weight:600;color:#419766;background:#fff;border-color:#dae9e0;padding:7px 15px}.page-back span{font-size:12px;color:#629779}.footer{color:#65957a}
.entry-layout{min-height:100vh}.entry-login .panel{border-radius:24px;box-shadow:0 24px 65px #2b634320;border:1px solid #fff}.entry-intro{border-radius:24px;background:linear-gradient(145deg,#1f4831,#32744e);box-shadow:0 24px 60px #295e4024}.entry-login input{background:#fbfcfb}.entry-login h1{margin-top:25px}
@media(max-width:800px){.top{padding:16px 18px;gap:14px}.brand{font-size:19px}.top .tools{gap:8px}.top .tools button{padding:6px 11px;font-size:13px;min-height:38px}nav{padding:12px 14px;border-bottom:1px solid #e2ede7;background:#fbfcfb}nav button{padding:9px 12px;border-radius:10px;min-height:42px;margin:2px;font-size:14px}main{padding:20px 16px}.panel{padding:20px;border-radius:16px}.heading h1{font-size:25px}.stats{gap:10px}.stat{padding:14px;border-radius:14px}.page-back{margin-bottom:16px}.page-back span{display:none}.entry-login .panel{padding:26px}.entry-intro{border-radius:18px}}
@media(prefers-reduced-motion:reduce){button,.button,nav button{transition:none}}
.entry-intro{padding:38px;color:#fff}.entry-intro h1{color:#fff}.entry-intro>p,.entry-features span,.entry-eyebrow{color:#e7f0eb}.entry-features b{color:#fff}
@media(max-width:800px){.layout{grid-template-rows:auto 1fr}nav{align-content:flex-start;align-items:center}nav button{box-shadow:none}.entry-intro{padding:24px;margin-bottom:22px}}

.progress-praise{background:linear-gradient(120deg,#edf9f5,#f7fbf9);border-color:#a9d8c8}.progress-praise h2{margin:14px 0 10px;line-height:1.65;color:#19644e}

.weekly-subject{margin:28px 0 16px;padding:14px 18px;border-left:4px solid #62bc89;background:#f4f8f6;border-radius:8px}.weekly-rates{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:10px}.weekly-rates .notice{margin:0}.weekly-low{color:#b52b35!important;border-color:#e7a0a6!important;background:#fff2f3!important}

/* Narrow phones still need side-by-side reading when held horizontally. */
@media (orientation:landscape) and (max-width:850px){
 .material-group{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:12px;align-items:start}
 .material-reader{position:sticky;top:8px;min-width:0;max-height:78vh;max-height:78dvh;margin-bottom:0;padding:12px;overflow:auto}
 .material-questions{min-width:0;max-height:78vh;max-height:78dvh;overflow:auto;padding:2px}
 .material-questions .question{padding:12px}
 .material-group img{max-width:100%;height:auto}
}
.learning-picker{max-height:300px;overflow:auto;padding:8px;border:1px solid #e2ede7;margin:12px 0}.learning-picker small{display:block;color:#648b75}

/* Water green and coral: white reading cards, dark accessible action colors. */
:root{--bg:#f2f7f3;--paper:#fff;--ink:#203b30;--sub:#52685c;--line:#d9e6dc;--brand:#246347;--soft:#eaf3ed;--danger:#ab3038;--good:#246347;--water:#8db799;--coral:#f57561}
body{background:radial-gradient(ellipse at 95% 0%,#dcecdf 0,transparent 48%),#f2f7f3}
.top{background:linear-gradient(110deg,#8db799,#a8c9b1);color:#163e2b;box-shadow:0 5px 20px #254b3518;border-bottom:1px solid #7ea98b}
.top .muted{color:#214b36}.top .tools button{background:#ffffffa8;color:#214b36;border-color:#648c704d}.top .tools button:hover{background:#fff}
nav{background:linear-gradient(180deg,#fff,#f0f6f1)}nav button.active{background:linear-gradient(120deg,#246347,#307653);color:#fff;box-shadow:0 4px 10px #24634724}
button.primary,.button.primary{background:linear-gradient(120deg,#246347,#307653);border-color:#246347;color:#fff;box-shadow:0 4px 10px #24634720}button.primary:hover,.button.primary:hover{background:#20553d}
.panel,.stat{background:#fff;border-color:#d9e6dc;box-shadow:0 6px 18px #254b350d,0 2px 3px #254b3505}.grid>.panel{border-top-color:#8db799}
.entry-layout{background:radial-gradient(ellipse at top left,#dcecdf,transparent 65%),#f2f7f3}.entry-intro{background:linear-gradient(140deg,#8db799,#bad5c1);color:#163e2b;box-shadow:0 12px 35px #254b3518;border-top:5px solid #f57561}.entry-intro h1,.entry-features b{color:#163e2b}.entry-intro>p,.entry-features span,.entry-eyebrow{color:#284e38}.entry-features div{border-left-color:#4f8160}.entry-login .panel{box-shadow:0 14px 36px #254b3514;border-color:#d9e6dc}
.material-reader{background:#fff}.heart{color:#c34738}.progress-praise{background:linear-gradient(110deg,#fff1ec,#fff9f6);border-color:#efc3b9;border-left:4px solid #f57561}.progress-praise h2{color:#863c31}
.chart-bar.normal{fill:#397852}.chart-value{fill:#246347}.legend-blue{color:#246347}.chart-bar.low{fill:#b6343c}.legend-red,.chart-value.low{color:#ab3038;fill:#ab3038}
.panel.low-rate{border:2px solid #b6343c;background:#fff5f5}.weekly-low{color:#ab3038!important;border-color:#d8999e!important;background:#fff2f3!important}
@media(max-width:800px){nav{background:#f4f8f5}}