:root {
  --navy:#091a31;
  --navy-2:#102944;
  --green:#35a987;
  --mint:#bcebdc;
  --cream:#f7f4ed;
  --ink:#192235;
  --muted:#6f7888;
  --line:#dce1e5;
  font-family: Inter,"PingFang SC","Microsoft YaHei",sans-serif;
  color:var(--ink);
  background:var(--cream);
}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--cream)}button,input,textarea{font:inherit}button,a{color:inherit}a{text-decoration:none}
.skills-header{height:76px;padding:0 max(24px,calc((100vw - 1440px)/2));display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:30px;position:sticky;top:0;z-index:30;border-bottom:1px solid rgba(255,255,255,.12);color:#fff;background:rgba(7,24,45,.96);backdrop-filter:blur(16px)}
.skills-brand{display:flex;align-items:center;gap:12px}.skills-brand img{width:42px;height:42px;border-radius:11px;object-fit:cover}.skills-brand b,.skills-brand small{display:block}.skills-brand b{font-size:16px}.skills-brand small{margin-top:3px;color:#a9b9c9;font-size:9px}
.skills-head-copy{text-align:center}.skills-head-copy span,.skills-head-copy strong{display:block}.skills-head-copy span{color:#7bd2b5;font-size:8px;font-weight:850;letter-spacing:.16em}.skills-head-copy strong{margin-top:4px;font-size:15px}.skills-home{justify-self:end;padding:10px 15px;border:1px solid #53657a;border-radius:99px;font-size:10px;font-weight:750}
main{min-height:calc(100vh - 76px)}
.skills-hero{padding:72px max(28px,calc((100vw - 1440px)/2));display:grid;grid-template-columns:minmax(0,1fr) 260px;align-items:end;gap:80px;color:#fff;background:radial-gradient(circle at 75% 20%,rgba(63,178,142,.29),transparent 26rem),linear-gradient(135deg,#07162e,#102c48 65%,#174d52)}
.skills-hero>div>span{color:#8fdac2;font-size:9px;font-weight:850;letter-spacing:.14em}.skills-hero h1{max-width:820px;margin:17px 0 20px;font:500 clamp(50px,6vw,86px)/.98 "Iowan Old Style","Songti SC",Georgia,serif}.skills-hero h1 em{color:#f0c36c;font-style:normal}.skills-hero p{max-width:760px;margin:0;color:#bdcad3;font-size:13px;line-height:1.9}
.skills-hero-actions{margin-top:28px;display:flex;flex-wrap:wrap;gap:10px}.skills-hero-actions a{padding:12px 18px;border:1px solid var(--mint);color:var(--navy);background:var(--mint);font-size:11px;font-weight:850}.skills-hero-actions a.secondary{color:#fff;border-color:#60788c;background:transparent}
.skills-hero aside{padding:24px;border:1px solid rgba(255,255,255,.18);background:rgba(255,255,255,.06)}.skills-hero aside b,.skills-hero aside span,.skills-hero aside small{display:block}.skills-hero aside b{font-size:35px}.skills-hero aside span{margin-top:4px;color:#b7c5d2;font-size:10px}.skills-hero aside div{height:6px;margin:20px 0 12px;overflow:hidden;border-radius:99px;background:rgba(255,255,255,.15)}.skills-hero aside i{width:0;height:100%;display:block;border-radius:inherit;background:#79d6b8;transition:.3s}.skills-hero aside small{color:#8fa3b3;font-size:9px}
.skills-principles,.skills-materials{padding:76px max(28px,calc((100vw - 1440px)/2))}.skills-principles{color:#fff;background:#07182d}.skills-materials{background:#f7f4ed}.skills-section-heading{max-width:850px;margin-bottom:32px}.skills-section-heading>span{color:#55bd9e;font-size:10px;font-weight:850;letter-spacing:.16em}.skills-section-heading h2{margin:12px 0 12px;font:500 clamp(34px,4.2vw,54px)/1.08 "Iowan Old Style","Songti SC",Georgia,serif}.skills-section-heading p{max-width:800px;margin:0;color:#6d7786;font-size:14px;line-height:1.8}.skills-principles .skills-section-heading p{color:#aebdcc}.principles-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));border:1px solid #31445a;border-right:0;border-bottom:0}.principles-grid article{min-height:200px;padding:24px;border-right:1px solid #31445a;border-bottom:1px solid #31445a;background:rgba(255,255,255,.025)}.principles-grid article:hover{background:rgba(84,189,158,.08)}.principles-grid b{color:#55bd9e;font:500 34px/1 "Iowan Old Style",Georgia,serif}.principles-grid h3{margin:35px 0 9px;font-size:20px}.principles-grid p{margin:0;color:#aebdcc;font-size:13px;line-height:1.7}.material-downloads{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.material-downloads a{min-height:145px;padding:24px;display:flex;flex-direction:column;justify-content:center;border:1px solid #d5dbda;color:#17243a;background:#fff;box-shadow:0 12px 35px rgba(22,35,50,.06)}.material-downloads a:hover{border-color:#2e9e80;transform:translateY(-2px)}.material-downloads .material-primary{color:#fff;border-color:#17413f;background:linear-gradient(135deg,#0c2933,#174d49)}.material-downloads span{color:#329b7e;font-size:10px;font-weight:850;letter-spacing:.1em}.material-downloads .material-primary span{color:#8ce0c4}.material-downloads b{margin:9px 0 6px;font-size:21px}.material-downloads small{color:#7c8590;font-size:12px}.material-downloads .material-primary small{color:#b7cac9}.practice-cases{margin-top:18px;display:grid;grid-template-columns:repeat(5,minmax(0,1fr));border:1px solid #d6d9d5;border-right:0;background:#fff}.practice-cases article{min-height:240px;padding:22px;border-right:1px solid #d6d9d5}.practice-cases span{color:#2d9b7d;font-size:10px;font-weight:900;letter-spacing:.12em}.practice-cases h3{min-height:48px;margin:30px 0 14px;font-size:18px;line-height:1.35}.practice-cases p{margin:5px 0;color:#596475;font-size:12px;line-height:1.55}.practice-cases p b{color:#1c293d}.practice-cases small{margin-top:14px;display:block;color:#7c8590;font-size:11px;line-height:1.65}
.skills-course-shell{width:min(1600px,100%);margin:auto;display:grid;grid-template-columns:260px minmax(0,1fr) 310px;align-items:start;background:#fff}
.skills-lessons,.skills-analysis{min-height:calc(100vh - 76px);position:sticky;top:76px}.skills-lessons{border-right:1px solid var(--line);background:#f4f6f4}.lesson-list-head{padding:24px 20px;border-bottom:1px solid var(--line)}.lesson-list-head span,.lesson-content>span,.builder-head span,.analysis-card>span,.quality-card>span{color:var(--green);font-size:8px;font-weight:850;letter-spacing:.15em}.lesson-list-head h2{margin:8px 0 14px;font-size:18px}.lesson-list-head button{padding:0;border:0;color:#78818d;background:none;font-size:9px;cursor:pointer}
#skillsLessonList{display:grid}.skills-lesson{padding:16px 18px;display:grid;grid-template-columns:30px 1fr auto;align-items:center;gap:10px;border:0;border-bottom:1px solid var(--line);text-align:left;background:transparent;cursor:pointer}.skills-lesson>span{width:28px;height:28px;display:grid;place-items:center;border-radius:8px;color:#73808c;background:#e6eae8;font-size:9px}.skills-lesson b,.skills-lesson small{display:block}.skills-lesson b{font-size:11px}.skills-lesson small{margin-top:4px;color:#9199a3;font-size:8px}.skills-lesson i{color:#aab0b7;font-style:normal}.skills-lesson.active{background:#fff}.skills-lesson.active>span{color:#fff;background:var(--green)}.skills-lesson.done i{color:var(--green);font-weight:900}
.skills-main{min-width:0}.lesson-content{min-height:370px;padding:48px clamp(28px,4.5vw,72px);border-bottom:1px solid var(--line)}.lesson-content h2{max-width:820px;margin:12px 0 17px;font:500 clamp(32px,4vw,50px)/1.08 "Iowan Old Style","Songti SC",Georgia,serif}.lesson-content>p{max-width:840px;margin:0;color:var(--muted);font-size:12px;line-height:1.9}.lesson-content ul{max-width:900px;margin:30px 0 0;padding:0;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;list-style:none}.lesson-content li{padding:16px;border:1px solid var(--line);color:#4c5667;background:#fafbfa;font-size:10px;line-height:1.7}.lesson-practice{margin-top:28px;padding:17px 20px;border-left:3px solid var(--green);background:#edf8f4}.lesson-practice b{display:block;margin-bottom:5px;font-size:11px}.lesson-practice p{margin:0;color:#586477;font-size:10px;line-height:1.7}
.skill-builder{padding:45px clamp(24px,4vw,60px) 70px}.builder-head{margin-bottom:27px;display:flex;align-items:flex-end;justify-content:space-between;gap:25px}.builder-head h2{margin:9px 0 7px;font-size:31px}.builder-head p{margin:0;color:var(--muted);font-size:10px}.builder-head button{padding:10px 14px;border:1px solid #29423f;color:#fff;background:#29423f;font-size:9px;cursor:pointer}.builder-grid{display:grid;grid-template-columns:minmax(310px,.9fr) minmax(340px,1.1fr);gap:20px}.builder-grid form{display:grid;gap:12px}.builder-grid label{display:grid;gap:6px;color:#3f4a5c;font-size:9px;font-weight:750}.builder-grid input,.builder-grid textarea{width:100%;padding:12px;border:1px solid #d4dbe0;border-radius:8px;color:#172033;background:#fafbfb;outline:none;font-size:10px;line-height:1.6;resize:vertical}.builder-grid input:focus,.builder-grid textarea:focus{border-color:var(--green);box-shadow:0 0 0 3px rgba(53,169,135,.1)}
.skill-preview-wrap{min-width:0;position:sticky;top:100px;align-self:start;border:1px solid #28364c;background:#08172c}.preview-toolbar{height:50px;padding:0 13px 0 17px;display:flex;align-items:center;justify-content:space-between;color:#c3cfda;border-bottom:1px solid #28364c;font-size:9px}.preview-toolbar div{display:flex;gap:6px}.preview-toolbar button{padding:7px 10px;border:1px solid #3e5066;color:#fff;background:#172a41;font-size:8px;cursor:pointer}#skillPreview{min-height:700px;max-height:calc(100vh - 180px);margin:0;padding:22px;overflow:auto;color:#d8e4e9;background:#08172c;white-space:pre-wrap;word-break:break-word;font:10px/1.8 ui-monospace,SFMono-Regular,Menlo,Consolas,monospace}
.skills-analysis{padding:24px 20px;border-left:1px solid var(--line);background:#f7f8f7}.analysis-card,.quality-card{padding:21px;border:1px solid var(--line);background:#fff}.analysis-card h2,.quality-card h2{margin:8px 0 15px;font-size:18px}.analysis-card p{color:#616c7b;font-size:10px;line-height:1.75}.analysis-card ul{padding-left:18px;color:#4e5b6c;font-size:9px;line-height:1.8}.analysis-card button{width:100%;margin-top:14px;padding:11px;border:0;color:#fff;background:var(--navy);font-size:9px;font-weight:800;cursor:pointer}.analysis-card button.done{color:#16352d;background:var(--mint)}.quality-card{margin-top:14px}.quality-card ul{margin:0;padding:0;display:grid;gap:8px;list-style:none}.quality-card li{padding:9px 10px;display:flex;align-items:center;gap:8px;border-radius:7px;color:#747e8c;background:#f2f4f4;font-size:9px}.quality-card li::before{content:"○"}.quality-card li.ok{color:#17644f;background:#e7f6f0}.quality-card li.ok::before{content:"✓";font-weight:900}.quality-card p{margin:15px 0 0;color:#8b929c;font-size:8px;line-height:1.7}
.skills-footer{padding:28px max(24px,calc((100vw - 1440px)/2));display:flex;align-items:center;justify-content:space-between;color:#9daabc;background:var(--navy);font-size:9px}.skills-footer b{color:#c6d2dc}.skills-toast{padding:10px 15px;position:fixed;left:50%;bottom:22px;z-index:50;transform:translate(-50%,25px);border-radius:99px;color:#fff;background:#17263a;opacity:0;pointer-events:none;transition:.2s;font-size:10px}.skills-toast.show{transform:translate(-50%,0);opacity:1}
body.lessons-collapsed .skills-course-shell{grid-template-columns:70px minmax(0,1fr) 310px}body.lessons-collapsed .lesson-list-head h2,body.lessons-collapsed .lesson-list-head span,body.lessons-collapsed .skills-lesson>div,body.lessons-collapsed .skills-lesson i{display:none}body.lessons-collapsed .lesson-list-head{padding:20px 10px;text-align:center}body.lessons-collapsed .skills-lesson{padding:13px 20px;display:block}
@media(max-width:1180px){.practice-cases{grid-template-columns:repeat(3,minmax(0,1fr));border-bottom:0}.practice-cases article{border-bottom:1px solid #d6d9d5}.skills-course-shell{grid-template-columns:230px minmax(0,1fr)}.skills-analysis{position:static;grid-column:1/-1;min-height:0;padding:25px;display:grid;grid-template-columns:1fr 1fr;gap:15px;border-top:1px solid var(--line);border-left:0}.quality-card{margin-top:0}.builder-grid{grid-template-columns:1fr}.skill-preview-wrap{position:static}#skillPreview{min-height:540px;max-height:none}}
@media(max-width:800px){.skills-header{height:66px;padding:0 16px;grid-template-columns:1fr auto}.skills-head-copy{display:none}.skills-brand img{width:38px;height:38px}.skills-home{padding:9px 12px}.skills-hero{padding:54px 20px;grid-template-columns:1fr;gap:35px}.skills-hero h1{font-size:52px}.skills-hero aside{max-width:360px}.skills-principles,.skills-materials{padding:55px 20px}.principles-grid{grid-template-columns:1fr 1fr}.material-downloads{grid-template-columns:1fr}.practice-cases{grid-template-columns:1fr 1fr}.skills-course-shell{display:block}.skills-lessons{min-height:0;position:static;top:0;border-right:0}.lesson-list-head{display:flex;align-items:center;justify-content:space-between;gap:15px}.lesson-list-head span{display:none}.lesson-list-head h2{margin:0;font-size:16px}#skillsLessonList{grid-template-columns:repeat(2,minmax(0,1fr))}.skills-main{width:100%}.lesson-content{min-height:0;padding:38px 20px}.lesson-content ul{grid-template-columns:1fr}.skill-builder{padding:38px 20px 55px}.builder-head{align-items:flex-start;flex-direction:column}.skills-analysis{display:block;padding:20px}.quality-card{margin-top:13px}.skills-footer{align-items:flex-start;flex-direction:column;gap:8px}body.lessons-collapsed .skills-course-shell{display:block}body.lessons-collapsed #skillsLessonList{display:none}body.lessons-collapsed .lesson-list-head h2,body.lessons-collapsed .lesson-list-head span{display:block}body.lessons-collapsed .lesson-list-head{padding:18px 20px;text-align:left}}
@media(max-width:520px){.skills-brand small{display:none}.skills-hero h1{font-size:43px}.skills-hero p{font-size:11px}.principles-grid,.practice-cases{grid-template-columns:1fr}.principles-grid article{min-height:170px}.practice-cases article{min-height:0}.skills-section-heading h2{font-size:35px}#skillsLessonList{grid-template-columns:1fr}.skills-lesson{padding:13px 16px}.lesson-content h2{font-size:34px}.builder-grid{display:block}.skill-preview-wrap{margin-top:18px}.skills-analysis{padding:15px}.skills-footer{text-align:center;align-items:center}}

/* 北魏学堂 R1：工作台以长时间阅读和填写为主，统一提升正文与控件字号。 */
.skills-brand small { font-size: 11px; }
.skills-head-copy span,
.skills-hero > div > span,
.lesson-list-head span,
.lesson-content > span,
.builder-head span,
.analysis-card > span,
.quality-card > span { font-size: 10px; }
.skills-home,
.lesson-list-head button { font-size: 12px; }
.skills-hero p { font-size: 16px; line-height: 1.75; }
.skills-hero aside small { font-size: 12px; }
.skills-lesson b { font-size: 13px; }
.skills-lesson small { font-size: 11px; }
.lesson-content > p { font-size: 15px; line-height: 1.8; }
.lesson-content li,
.lesson-practice p { font-size: 13px; }
.lesson-practice b { font-size: 14px; }
.builder-head p { font-size: 13px; }
.builder-head button { font-size: 12px; }
.builder-grid label { font-size: 12px; }
.builder-grid input,
.builder-grid textarea { font-size: 14px; }
.preview-toolbar { font-size: 12px; }
.preview-toolbar button { font-size: 11px; }
#skillPreview { font-size: 12px; line-height: 1.75; }
.analysis-card p { font-size: 14px; }
.analysis-card ul { font-size: 13px; }
.analysis-card button { font-size: 12px; }
.quality-card li { font-size: 12px; }
.quality-card p,
.skills-footer { font-size: 11px; }

@media(max-width:520px){
  .skills-hero p { font-size: 15px; }
  .lesson-content > p { font-size: 14px; }
  .builder-grid input,
  .builder-grid textarea { font-size: 16px; }
}