:root{--bg:#f5f7fb;--panel:#ffffff;--ink:#172033;--muted:#61708a;--line:#dfe5ef;--nav:#13233f;--accent:#246bce;--accent2:#0e9f6e;--warn:#b45309;--danger:#ba3d3d;--soft:#edf5ff;--soft2:#effaf5;--soft3:#fff6e9;--shadow:0 8px 25px rgba(17,34,68,.07)}*{box-sizing:border-box}html{scroll-behavior:smooth;max-width:100%;overflow-x:hidden}body{margin:0;background:var(--bg);color:var(--ink);font:15px/1.72 Microsoft YaHei,PingFang SC,Arial,sans-serif;max-width:100%;overflow-x:hidden}a{color:inherit;text-decoration:none}body.course-picker-active{background:#f3f6fb}.layout{display:block;min-height:100vh}aside{position:fixed;left:0;top:0;width:286px;height:100vh;background:var(--nav);color:#dce8fc;padding:22px 17px;overflow:auto;overscroll-behavior:contain}.brand{padding:4px 10px 18px;border-bottom:1px solid rgba(255,255,255,.13);margin-bottom:16px}.brand small{color:#8fa8cc;letter-spacing:.08em}.brand h1{font-size:18px;line-height:1.35;margin:7px 0 0;color:#fff}.nav-title{font-size:11px;color:#85a0c7;margin:16px 10px 6px;letter-spacing:.12em}.nav a{display:block;padding:8px 10px;border-radius:8px;color:#cbd9ef;font-size:13px}.nav a:hover{background:#ffffff17;color:#fff}.nav .hot{color:#ffe9b0}main{width:auto;min-width:0;padding:34px 42px 72px;margin:0 0 0 286px}.hero{background:linear-gradient(125deg,#173660,#275fba);color:#fff;border-radius:18px;padding:30px 34px;box-shadow:var(--shadow)}.hero .eyebrow{font-size:12px;opacity:.8;letter-spacing:.12em}.hero h2{font-size:30px;line-height:1.35;margin:8px 0 10px}.hero p{margin:0;max-width:900px;color:#e0ebff}.toolbar{display:flex;gap:10px;align-items:center;margin:20px 0;flex-wrap:wrap}.search{flex:1;min-width:220px;padding:11px 13px;border:1px solid var(--line);border-radius:10px;background:#fff;font:inherit}.btn{border:1px solid var(--line);background:#fff;padding:9px 12px;border-radius:9px;cursor:pointer;color:var(--muted)}.btn.active{background:var(--soft);border-color:#a7caed;color:#13549c}.download-link{display:inline-flex;align-items:center;justify-content:center;border:1px solid #92c2a8;background:var(--soft2);padding:9px 13px;border-radius:9px;color:#11744f;font-weight:700;white-space:nowrap}.download-link:hover{border-color:#60a987;background:#dff5ea;color:#0b5c3d}.notice{border-left:4px solid var(--accent);background:var(--soft);padding:13px 16px;border-radius:0 10px 10px 0;margin:18px 0;color:#27517e}section{margin-top:30px;scroll-margin-top:18px}.section-head{display:flex;align-items:baseline;gap:12px;margin:0 0 13px}.kicker{font-size:13px;font-weight:700;color:var(--accent);letter-spacing:.08em}.section-head h2{font-size:23px;margin:0}.section-note{font-size:13px;color:var(--muted);margin-left:auto}.card{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:19px 21px;margin:12px 0;box-shadow:0 2px 7px #11224406;min-width:0}.card h3{font-size:17px;margin:0 0 9px}.card h4{font-size:15px;margin:16px 0 7px;color:#223f66}.card p{margin:6px 0}.card ul,.card ol{margin:7px 0 7px 20px;padding:0}.card li{margin:3px 0}.grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.grid3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}.tile{background:#fbfcff;border:1px solid var(--line);border-radius:11px;padding:14px}.tile strong{display:block;margin-bottom:5px}.tag{display:inline-block;padding:2px 8px;border-radius:99px;font-size:12px;margin-right:6px;font-weight:700}.t-record{background:#e7f1ff;color:#19559e}.t-ppt{background:#e9f8f0;color:#11744f}.t-exam{background:#fff1dc;color:#9d5900}.t-trap{background:#ffeaea;color:#a63232}.formula{font-family:Consolas,Courier New,monospace;background:#101c31;color:#eaf2ff;padding:12px 14px;border-radius:9px;margin:10px 0;overflow:auto;white-space:pre-wrap}.flow{display:flex;flex-wrap:wrap;gap:7px;align-items:center;margin:10px 0}.node{background:#f4f8ff;border:1px solid #c9ddf6;border-radius:8px;padding:6px 9px;font-size:13px}.arrow{color:#7f96b9;font-weight:700}.table-wrap{overflow:auto;margin:9px 0}table{width:100%;border-collapse:collapse;font-size:13px;min-width:650px}th{background:#f0f5fb;color:#294466;text-align:left}td,th{border:1px solid var(--line);padding:8px 10px;vertical-align:top}details{border:1px solid var(--line);border-radius:10px;background:#fff;margin:9px 0}summary{cursor:pointer;font-weight:700;padding:12px 14px;color:#263d5d}details>div{padding:0 14px 14px}.answer{background:var(--soft2);border-left:4px solid var(--accent2);padding:11px 13px;border-radius:0 8px 8px 0;margin-top:10px}.trap{background:#fff7ee;border-left:4px solid #e38b18;padding:11px 13px;border-radius:0 8px 8px 0;margin-top:10px}.mini{font-size:13px;color:var(--muted)}.checklist{columns:2;gap:22px}.checklist label{display:block;break-inside:avoid;padding:4px 0}.checklist input{vertical-align:middle;margin-right:7px}.footer{font-size:12px;color:var(--muted);margin-top:34px;padding-top:14px;border-top:1px solid var(--line)}.hidden{display:none!important}@media(max-width:900px){.nav{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:2px}.nav-title{grid-column:1/-1}main{padding:24px 17px}.grid,.grid3{grid-template-columns:1fr}.section-note{display:none}}@media(max-width:560px){.hero{padding:24px 20px}.hero h2{font-size:24px}.nav{grid-template-columns:1fr}.checklist{columns:1}}@media print{aside,.toolbar{display:none}.layout{display:block}main{padding:0;max-width:none;margin:0}.hero{border-radius:0}.card{break-inside:avoid;box-shadow:none}}:root{--extra:#7651b5;--extra-soft:#f2edff}.formula{font-family:"STIX Two Math","Cambria Math",Times New Roman,serif;background:#f8fbff;color:#122238;border:1px solid #c9dff6;padding:14px 16px;border-radius:10px;margin:12px 0;overflow:auto;white-space:normal;line-height:1.8}.formula mjx-container{margin:.45em 0!important;overflow-x:auto;overflow-y:hidden;max-width:100%}.inline-formula{display:inline-block;padding:2px 7px;border:1px solid #c9dff6;background:#f5f9ff;border-radius:6px;color:#132f52}.t-know{background:var(--extra-soft);color:#62429d}.extra-card{border-left:4px solid var(--extra);background:#fcfbff}.ppt-figure{margin:16px 0 20px;border:1px solid #d9e2f0;border-radius:14px;overflow:hidden;background:#fff;box-shadow:0 3px 12px #142b4e0f}.fig-image{background:#f5f8fd;padding:12px;display:flex;justify-content:center;align-items:center}.fig-image img{display:block;width:100%;max-width:1020px;height:auto;border:1px solid #d4deeb;border-radius:7px;background:#fff}.ppt-figure figcaption{padding:12px 16px 5px;color:#253d60;font-size:15px}.ppt-figure figcaption strong{display:block;margin-top:7px;font-size:16px;color:#172b48}.fig-grid{display:grid;grid-template-columns:1.1fr 1fr;gap:14px;padding:8px 16px 16px}.fig-grid>div{background:#fbfcff;border:1px solid #e3e9f2;border-radius:10px;padding:11px 12px}.fig-grid p{margin:5px 0}.fig-grid ol{margin:6px 0 0 20px;padding:0}.fig-grid li{margin:3px 0}.fig-trap{margin:0 16px 16px;padding:10px 12px;border-left:4px solid #e38b18;border-radius:0 8px 8px 0;background:#fff7ee;color:#75480c}.legend{display:flex;gap:8px;flex-wrap:wrap;margin:10px 0}.legend span{font-size:12px;border-radius:99px;padding:3px 8px;border:1px solid var(--line);background:#fff}.formula-table td:first-child{font-weight:700;color:#27466f;white-space:nowrap}@media(max-width:780px){.fig-grid{grid-template-columns:1fr}.fig-image{padding:7px}.ppt-figure{margin-left:0;margin-right:0}}body{overflow-x:hidden}aside{width:286px;z-index:30;transition:transform .24s ease,opacity .2s ease}.nav-toggle{position:fixed;z-index:50;top:16px;left:14px;display:none;align-items:center;gap:7px;border:1px solid rgba(18,35,63,.18);background:#fff;color:#173660;border-radius:9px;padding:8px 11px;font:600 13px/1.2 Microsoft YaHei,PingFang SC,Arial,sans-serif;box-shadow:0 4px 14px #12233f24;cursor:pointer;transition:left .24s ease,background .2s ease}.nav-toggle:hover{background:#edf5ff}.nav-toggle .toggle-icon{font-size:16px;line-height:1}.math-rendered{vertical-align:middle}.math-inline{display:inline-block;max-width:100%;vertical-align:-.18em;white-space:nowrap}.math-inline mjx-container{margin:0!important}.math-display{display:block;max-width:100%;overflow-x:auto;overflow-y:hidden;margin:12px 0;text-align:center;padding:2px 0}.math-display mjx-container{margin:0 auto!important}.math-rendered svg{max-width:none;height:auto}.math-display svg{max-width:none}.math-fallback{font-family:Consolas,Courier New,monospace;background:#fff4f4;color:#a22;padding:1px 4px;border-radius:4px}@media(max-width:900px){html,body{width:100%;max-width:100%;overflow-x:hidden}.layout{display:block}aside{position:fixed;left:0;top:0;width:286px;max-width:82vw;height:100vh;box-shadow:8px 0 22px #12233f38;transform:translate(0);opacity:1}main{max-width:none;width:100%;padding:74px 14px 50px;margin:0;overflow:hidden}.nav-toggle{display:inline-flex;top:14px;left:14px;max-width:calc(100vw - 28px)}body.nav-collapsed aside{transform:translate(-105%);opacity:0;pointer-events:none}body.study-nav-open{overflow:hidden}body.study-nav-open:before{content:"";position:fixed;inset:0;background:#0a14265c;z-index:20}.hero,.card,.notice,.ppt-figure{max-width:100%;overflow-x:auto}.hero{padding:24px 20px}.hero h2{font-size:25px}.toolbar{align-items:stretch}.search{flex-basis:100%;min-width:0;width:100%}.btn,.download-link{flex:1 1 auto;min-height:42px}table{min-width:620px}.math-display{font-size:.94em}.math-inline{max-width:100%;overflow-x:auto;overflow-y:hidden}}@media(max-width:560px){main{padding-left:10px;padding-right:10px}.hero{border-radius:12px}.card{padding:15px 14px;border-radius:12px}.toolbar{gap:8px}.btn,.download-link{font-size:13px;padding:9px 10px}.fig-grid{padding-left:10px;padding-right:10px}.fig-trap{margin-left:10px;margin-right:10px}}.course-home,.simple-course-page{min-height:100vh;padding:52px clamp(18px,5vw,76px);color:#172033}.course-hero{min-height:220px;display:flex;align-items:flex-end;border-bottom:1px solid var(--line);padding-bottom:34px;margin-bottom:30px}.course-eyebrow{margin:0 0 8px;color:var(--accent);font-weight:800;letter-spacing:.12em;font-size:12px}.course-hero h1,.simple-panel h1{margin:0;color:#101b2f;line-height:1.12}.course-hero h1{font-size:clamp(38px,6vw,76px)}.course-hero p:last-child,.simple-panel p{max-width:620px;color:var(--muted);font-size:17px;margin:12px 0 0}.course-grid{display:grid;grid-template-columns:repeat(2,minmax(260px,1fr));gap:18px;max-width:980px}.course-card{min-height:210px;border:1px solid var(--line);background:#fff;border-radius:12px;padding:24px;display:flex;flex-direction:column;justify-content:flex-end;box-shadow:0 8px 24px #12233f12;transition:transform .18s ease,border-color .18s ease,box-shadow .18s ease}.course-card:hover{transform:translateY(-3px);border-color:#a9c7ed;box-shadow:0 14px 34px #12233f1f}.course-card span{color:var(--accent);font-size:13px;font-weight:800;letter-spacing:.1em}.course-card strong{font-size:28px;line-height:1.18;margin:10px 0;color:#111c30}.course-card em{font-style:normal;color:var(--muted)}.course-card-dsp{border-top:5px solid #0e9f6e}.course-card-mobile{border-top:5px solid #246bce}.simple-course-page{display:flex;flex-direction:column;gap:26px}.back-home{align-self:flex-start;border:1px solid var(--line);background:#fff;border-radius:9px;padding:8px 12px;color:#294466;font-weight:700}.simple-panel{max-width:720px;background:#fff;border:1px solid var(--line);border-radius:12px;padding:30px;box-shadow:0 8px 24px #12233f12}.primary-download{display:inline-flex;align-items:center;justify-content:center;margin-top:22px;border:1px solid #74b895;background:#e9f8f0;color:#0f6b49;border-radius:9px;padding:11px 16px;font-weight:800}.primary-download:hover{background:#dcf3e8;border-color:#4d9f75}@media(max-width:720px){.course-home,.simple-course-page{padding:28px 16px}.course-hero{min-height:170px}.course-grid{grid-template-columns:1fr}.course-card{min-height:170px}}