:root{color:#17202b;font-synthesis:none;text-rendering:optimizelegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;--ink:#17202b;--ink-soft:#637083;--panel:#ffffffd6;--panel-strong:#fffffff0;--line:#17202b14;--brand:#1f6fff;--accent:#ff8f3f;--good:#0eaa62;--shadow:0 14px 36px #161f2d1f;background:radial-gradient(circle at 100% 0,#2d74ff1a,#0000 30%),linear-gradient(#f5f2e8 0%,#f8f7f3 46%,#eef4fb 100%);font-family:Aptos,Noto Sans SC,Microsoft YaHei,sans-serif;font-weight:400;line-height:1.5}*{box-sizing:border-box}html,body,#app{min-width:320px;min-height:100vh;margin:0}body{color:var(--ink)}a{color:inherit;text-decoration:none}button,input,textarea{font:inherit}button{cursor:pointer}.mobile-shell{min-height:100vh;padding-bottom:92px}.mobile-header{z-index:10;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-bottom:1px solid var(--line);background:#f8f7f3eb;justify-content:space-between;align-items:center;padding:18px 18px 14px;display:flex;position:sticky;top:0}.mobile-header h1{margin:0;font-size:22px}.mobile-header p{color:var(--ink-soft);margin:4px 0 0;font-size:13px}.avatar-chip{color:var(--brand);background:#1f6fff14;border-radius:999px;padding:8px 12px;font-size:13px}.mobile-page{gap:16px;padding:18px;display:grid}.mobile-card,.mobile-list-item,.login-card,.content-block,.exam-question,.notice-card,.result-card{background:var(--panel);box-shadow:var(--shadow);border:1px solid #ffffffe6;border-radius:24px}.hero-card{color:#fff;background:linear-gradient(135deg,#1453ffeb,#0ab0aadb),#1f6fff;padding:20px}.hero-card h2{margin:0 0 6px;font-size:24px}.hero-card p{color:#fffc;margin:0}.hero-stats,.info-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin-top:18px;display:grid}.hero-stat,.stat-chip{background:#ffffff24;border-radius:18px;padding:14px}.stat-chip{background:#1f6fff0f}.hero-stat strong,.stat-chip strong{margin-top:6px;font-size:22px;display:block}.section-head{justify-content:space-between;align-items:flex-start;gap:12px;display:flex}.section-head h2,.section-head h3{margin:0}.section-head p{color:var(--ink-soft);margin:4px 0 0;font-size:13px}.mobile-card,.notice-card,.result-card{padding:18px}.mobile-list{gap:12px;display:grid}.mobile-list-item,.content-block,.exam-question{padding:16px}.mobile-list-item h3,.content-block h3,.exam-question h3{margin:0 0 8px;font-size:17px}.muted{color:var(--ink-soft)}.pill{color:var(--brand);background:#1f6fff14;border-radius:999px;align-items:center;padding:6px 10px;font-size:12px;display:inline-flex}.pill.warn{color:var(--accent);background:#ff8f3f1f}.pill.good{color:var(--good);background:#0eaa621f}.progress-track{background:#17202b14;border-radius:999px;width:100%;height:8px;overflow:hidden}.progress-fill{border-radius:inherit;background:linear-gradient(90deg, var(--brand), var(--accent));height:100%}.action-row{flex-wrap:wrap;gap:10px;display:flex}.primary-button,.ghost-button{border:0;border-radius:14px;padding:12px 16px}.primary-button{background:linear-gradient(135deg, var(--brand), #4aa2ff);color:#fff}.primary-button:disabled,.option-item:disabled,.ghost-button:disabled{opacity:.7;cursor:not-allowed}.ghost-button{color:var(--brand);background:#1f6fff14}.tabbar{border-top:1px solid var(--line);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);background:#f8f7f3f5;grid-template-columns:repeat(5,1fr);gap:10px;padding:12px 14px 18px;display:grid;position:fixed;bottom:0;left:0;right:0}.tab-item{color:var(--ink-soft);border-radius:16px;flex-direction:column;align-items:center;gap:4px;padding:10px 8px;font-size:12px;display:flex}.tab-item.router-link-active{color:var(--brand);background:#1f6fff14}.login-shell{place-items:center;min-height:100vh;padding:18px;display:grid}.login-card{width:min(420px,100%);padding:24px}.login-card h1{margin:8px 0 10px;font-size:28px}.login-card p{color:var(--ink-soft);margin:0 0 18px}.login-form{gap:12px;display:grid}.hint-list{border-top:1px solid var(--line);color:var(--ink-soft);gap:8px;margin-top:18px;padding-top:18px;font-size:13px;display:grid}.form-error{color:var(--accent);background:#ff8f3f1f;border-radius:16px;margin-top:14px;padding:12px 14px}.input-control,.answer-textarea{border:1px solid var(--line);background:var(--panel-strong);width:100%;color:var(--ink);border-radius:16px;padding:14px 16px}.answer-textarea{resize:vertical;min-height:132px}.detail-banner{color:#fff;background:linear-gradient(135deg,#17202b,#29486d);border-radius:24px;padding:20px}.detail-banner p{color:#ffffffb8;margin:6px 0 0}.content-media{background:#dce8f8;border-radius:18px;width:100%;margin-top:14px;display:block}.rich-text{color:var(--ink);white-space:pre-wrap;background:#1f6fff0a;border-radius:18px;margin-top:14px;padding:14px}.option-grid{gap:10px;margin-top:14px;display:grid}.option-item{border:1px solid var(--line);background:var(--panel-strong);color:var(--ink);text-align:left;border-radius:18px;padding:14px}.option-item span{width:28px;height:28px;color:var(--brand);background:#1f6fff14;border-radius:999px;justify-content:center;align-items:center;margin-right:10px;display:inline-flex}.option-item strong{font-weight:600}.option-item.active{background:#1f6fff14;border-color:#1f6fff47}.notice-card{color:var(--brand)}.result-card{background:linear-gradient(135deg,#0eaa621a,#1f6fff14)}.modal-overlay{z-index:1000;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);background:#17202b99;place-items:center;padding:24px;display:grid;position:fixed;inset:0}.modal-container{background:var(--panel-strong);width:min(480px,100%);box-shadow:var(--shadow);border:1px solid #ffffffe6;border-radius:24px;overflow:hidden}.modal-container.small{width:min(360px,100%)}@media (width<=420px){.hero-stats,.info-grid{grid-template-columns:1fr}}.pill.bad{color:#d64545;background:#d645451f}.course-cover{object-fit:cover;background:var(--panel-muted,#eef2f7);border-radius:14px;width:100%;height:168px;margin-bottom:12px;display:block}