:root{
  --navy:#0b1220; --navy-2:#101d33; --navy-3:#162743;
  --ink:#0f172a; --ink-2:#334155; --muted:#64748b; --faint:#94a3b8;
  --blue:#2f7bff; --blue-d:#1d4ed8; --blue-soft:#e8f0ff; --blue-pale:#f1f6ff;
  --teal:#0ea5a4; --teal-d:#0f766e; --teal-soft:#e6faf8;
  --amber:#f59e0b; --amber-soft:#fff7e6;
  --violet:#7c3aed; --violet-soft:#f3eefe;
  --rose:#e11d48; --rose-soft:#fff1f4;
  --line:#e6ecf5; --line-2:#dbe4f0; --bg:#f4f7fc; --card:#ffffff;
  --shadow:0 12px 40px rgba(15,23,42,.07);
  --shadow-sm:0 4px 16px rgba(15,23,42,.06);
  --r:22px; --r-sm:14px;
}
*{box-sizing:border-box}
[hidden]{display:none!important}
html,body{margin:0;padding:0;overflow-x:hidden}
body{
  font-family:"Microsoft YaHei","PingFang SC","Noto Sans SC",-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  color:var(--ink); background:var(--bg); font-size:15px; line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
button{font-family:inherit;cursor:pointer;border:0;background:none;color:inherit}
input,textarea,select{font-family:inherit;font-size:14px;color:var(--ink)}
img{max-width:100%}
svg{width:1em;height:1em;display:inline-block;vertical-align:-.12em;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.hidden{display:none!important}

.app-shell{display:flex;min-height:100vh}
.sidebar{
  width:254px;position:fixed;inset:0 auto 0 0;z-index:40;
  background:linear-gradient(180deg,#0a1120 0%,#0d1930 62%,#0b1527 100%);
  color:#cbd8ea;display:flex;flex-direction:column;padding:22px 18px 18px;
  border-right:1px solid rgba(255,255,255,.05);
}
.brand{display:flex;align-items:center;gap:11px;padding:2px 8px 22px}
.brand-icon{width:42px;height:42px;object-fit:contain;filter:drop-shadow(0 4px 14px rgba(47,123,255,.45))}
.brand-text{display:flex;flex-direction:column;line-height:1.15}
.brand-text strong{color:#fff;font-size:20px;letter-spacing:.5px}
.brand-text span{font-size:11px;color:#7f9cc5;letter-spacing:1.6px;margin-top:5px}
.nav{display:flex;flex-direction:column;gap:6px}
.nav-item{
  display:flex;align-items:center;gap:12px;padding:11px 12px;border-radius:12px;
  color:#93a9c7;font-size:14.5px;transition:.18s;position:relative
}
.nav-item .nav-ico{font-size:18px;display:flex;color:#7290b7}
.nav-item:hover{background:rgba(47,123,255,.1);color:#eaf2ff}
.nav-item.active{background:linear-gradient(90deg,rgba(47,123,255,.22),rgba(47,123,255,.08));color:#fff;box-shadow:inset 0 0 0 1px rgba(80,140,255,.18)}
.nav-item.active .nav-ico{color:#6ea8ff}
.nav-item.active::before{content:"";position:absolute;left:-18px;top:12px;bottom:12px;width:3px;border-radius:3px;background:var(--blue)}
.nav-count{margin-left:auto;background:rgba(255,255,255,.1);color:#cfe0f7;font-size:11px;padding:1px 7px;border-radius:20px}
.side-divider{height:1px;background:rgba(255,255,255,.07);margin:22px 8px 18px}
.side-label{font-size:11px;color:#647fa4;letter-spacing:2px;padding:0 10px 10px}
.progress-card{display:flex;align-items:center;gap:13px;padding:13px;background:rgba(255,255,255,.045);border:1px solid rgba(255,255,255,.07);border-radius:16px}
.ring{
  --p:0; width:48px;height:48px;border-radius:50%;flex:none;
  background:conic-gradient(#42d3c7 calc(var(--p)*1%),rgba(255,255,255,.09) 0);
  display:grid;place-items:center;position:relative
}
.ring::after{content:"";position:absolute;inset:5px;border-radius:50%;background:#0d1930}
.ring span{position:relative;z-index:1;font-size:10px;color:#e6f0ff;font-weight:700}
.progress-copy{display:flex;flex-direction:column}
.progress-copy strong{color:#fff;font-size:14px}
.progress-copy span{font-size:11px;color:#6f88a9;margin-top:2px}
.streak-card{display:flex;gap:10px;align-items:flex-start;margin-top:10px;padding:12px 13px;border-radius:14px;background:linear-gradient(135deg,rgba(47,123,255,.13),rgba(14,165,164,.08));border:1px solid rgba(80,140,255,.14)}
.streak-card .spark{color:#5eead4;font-size:20px}
.streak-card div{display:flex;flex-direction:column}
.streak-card strong{color:#dbeafe;font-size:12px}
.streak-card span{font-size:10.5px;color:#7e97b5;line-height:1.45;margin-top:2px}
.sidebar-foot{margin-top:auto;padding:16px 8px 0;display:flex;flex-direction:column;gap:12px}
.admin-link{display:flex;align-items:center;gap:8px;font-size:12px;color:#7f99ba}
.admin-link:hover{color:#fff}
.version{font-size:10px;color:#526b8b;letter-spacing:.4px}

.main-wrap{margin-left:254px;width:calc(100% - 254px);min-height:100vh;display:flex;flex-direction:column}
.topbar{
  height:72px;padding:0 32px;display:flex;align-items:center;gap:20px;
  background:rgba(255,255,255,.82);backdrop-filter:blur(14px);
  border-bottom:1px solid rgba(226,232,240,.9);position:sticky;top:0;z-index:30
}
.menu-btn{display:none}
.icon-btn{width:38px;height:38px;border-radius:11px;display:grid;place-items:center;font-size:18px;color:var(--muted);transition:.16s}
.icon-btn:hover{background:#eff4fb;color:var(--ink)}
.search-trigger{
  flex:1;max-width:620px;height:42px;background:#f3f6fb;border:1px solid #e8eef7;border-radius:13px;
  display:flex;align-items:center;gap:10px;padding:0 13px;color:#8796ab;font-size:13px;cursor:pointer;transition:.16s;min-width:0
}
.search-trigger > span:nth-child(2){overflow:hidden;text-overflow:ellipsis;white-space:nowrap;min-width:0;flex:1}
.search-trigger:hover{border-color:#cfdcf0;background:#fff;box-shadow:var(--shadow-sm)}
.search-trigger kbd{margin-left:auto;font-family:inherit;font-size:10px;background:#fff;border:1px solid #e2e8f0;border-radius:5px;padding:2px 6px;color:#94a3b8}
.top-actions{display:flex;align-items:center;gap:12px;margin-left:auto}
.top-pill{display:inline-flex;align-items:center;gap:6px;font-size:11.5px;color:#0f766e;background:#e6faf8;border:1px solid #c9f0ec;padding:7px 11px;border-radius:20px}
.user-chip{display:flex;align-items:center;gap:9px;padding:5px 7px 5px 5px;border-radius:13px;transition:.16s}
.user-chip:hover{background:#f3f7fd}
.avatar{width:34px;height:34px;border-radius:10px;background:linear-gradient(135deg,#3b82f6,#0ea5a4);color:#fff;display:grid;place-items:center;font-weight:700;font-size:14px}
.user-meta{display:flex;flex-direction:column;line-height:1.2;text-align:left}
.user-meta strong{font-size:12.5px}
.user-meta small{font-size:10px;color:var(--faint);margin-top:2px}
.view{padding:28px 32px 60px;max-width:1560px;width:100%;margin:0 auto;outline:0}

/* common */
.eyebrow{font-size:10px;letter-spacing:2.4px;font-weight:800;color:var(--blue);text-transform:uppercase}
.page-title{font-size:32px;line-height:1.25;margin:3px 0 7px;letter-spacing:-.5px}
.page-sub{color:var(--muted);font-size:13.5px;margin:0}
.row{display:flex;align-items:center;gap:10px}
.between{display:flex;align-items:center;justify-content:space-between;gap:16px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:7px;padding:10px 16px;border-radius:11px;font-size:13px;font-weight:600;transition:.18s;border:1px solid transparent;white-space:nowrap}
.btn svg{font-size:15px}
.btn-primary{background:linear-gradient(135deg,#2f7bff,#1d4ed8);color:#fff;box-shadow:0 8px 22px rgba(47,123,255,.25)}
.btn-primary:hover{transform:translateY(-1px);box-shadow:0 12px 26px rgba(47,123,255,.32)}
.btn-ghost{background:#fff;border-color:var(--line);color:var(--ink-2)}
.btn-ghost:hover{border-color:#cdd9ea;background:#fafcff}
.btn-soft{background:var(--blue-soft);color:var(--blue-d)}
.btn-teal{background:var(--teal);color:#fff}
.btn-sm{padding:7px 11px;font-size:12px;border-radius:9px}
.btn[disabled]{opacity:.5;cursor:not-allowed;transform:none!important}
.icon-text{display:inline-flex;align-items:center;gap:6px;color:var(--muted);font-size:11.5px}
.pill{display:inline-flex;align-items:center;gap:5px;padding:4px 9px;border-radius:20px;font-size:11px;background:#f1f5f9;color:#475569;border:1px solid transparent}
.pill.blue{background:var(--blue-soft);color:var(--blue-d)}
.pill.teal{background:var(--teal-soft);color:var(--teal-d)}
.pill.amber{background:var(--amber-soft);color:#b45309}
.pill.violet{background:var(--violet-soft);color:#6d28d9}
.pill.rose{background:var(--rose-soft);color:#be123c}
.dot{width:5px;height:5px;border-radius:50%;background:var(--blue);display:inline-block}
.muted{color:var(--muted)}
.small{font-size:12px}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--r);box-shadow:var(--shadow-sm)}
.section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:16px;margin:34px 0 16px}
.section-head h2{font-size:20px;margin:0;letter-spacing:-.2px}
.section-head p{margin:3px 0 0;font-size:12.5px;color:var(--muted)}
.link{color:var(--blue-d);font-size:12.5px;font-weight:600;display:inline-flex;align-items:center;gap:4px}

/* home */
.hero{
  position:relative;overflow:hidden;border-radius:28px;padding:34px 38px 32px;color:#fff;
  background:radial-gradient(circle at 85% 15%,rgba(45,212,191,.2),transparent 32%),
             radial-gradient(circle at 72% 90%,rgba(47,123,255,.35),transparent 40%),
             linear-gradient(135deg,#0a1325,#102449 60%,#0b1a33);
  box-shadow:0 24px 60px rgba(8,18,34,.18)
}
.hero::after{content:"";position:absolute;right:-80px;top:-120px;width:420px;height:420px;border:1px solid rgba(120,170,255,.22);border-radius:50%;box-shadow:0 0 0 55px rgba(120,170,255,.05),0 0 0 110px rgba(120,170,255,.035)}
.hero-grid{display:grid;grid-template-columns:1.45fr .8fr;gap:30px;position:relative;z-index:2;align-items:center}
.hero .eyebrow{color:#5eead4}
.hero h1{font-size:37px;line-height:1.22;margin:8px 0 12px;letter-spacing:-1px;max-width:680px}
.hero h1 em{font-style:normal;background:linear-gradient(90deg,#7dd3fc,#5eead4);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p{color:#a9bdd8;font-size:13.5px;line-height:1.8;max-width:610px;margin:0 0 22px}
.hero-actions{display:flex;gap:10px;flex-wrap:wrap}
.hero-stats{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}
.hero-stat{padding:16px 17px;border-radius:17px;background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.09);backdrop-filter:blur(6px)}
.hero-stat b{display:block;font-size:26px;line-height:1;letter-spacing:-.5px;color:#fff}
.hero-stat span{font-size:11px;color:#90a8c8;display:block;margin-top:6px}
.course-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px;margin-top:20px}
.course-card{
  position:relative;overflow:hidden;padding:25px 26px 22px;border-radius:24px;background:#fff;border:1px solid var(--line);
  box-shadow:var(--shadow-sm);transition:.2s;min-height:236px
}
.course-card:hover{transform:translateY(-3px);box-shadow:var(--shadow);border-color:#cfdef5}
.course-card .watermark{position:absolute;right:16px;top:6px;font-size:96px;font-weight:900;letter-spacing:-6px;color:#f1f5fb;line-height:1;pointer-events:none}
.course-card.c356{border-top:3px solid var(--blue)}
.course-card.c447{border-top:3px solid var(--teal)}
.course-top{display:flex;align-items:center;gap:10px;position:relative;z-index:1}
.course-code{font-size:11px;font-weight:800;letter-spacing:1px;padding:4px 8px;border-radius:7px;background:var(--blue-soft);color:var(--blue-d)}
.c447 .course-code{background:var(--teal-soft);color:var(--teal-d)}
.course-card h3{font-size:23px;margin:14px 0 7px;position:relative;z-index:1;letter-spacing:-.4px}
.course-card p{font-size:12.5px;color:var(--muted);line-height:1.7;margin:0 0 16px;max-width:90%;position:relative;z-index:1}
.course-meta{display:flex;gap:15px;font-size:11px;color:var(--faint);margin-bottom:16px}
.course-meta b{color:var(--ink-2);font-size:13px}
.course-foot{display:flex;align-items:center;justify-content:space-between;position:relative;z-index:1}
.mini-bar{height:5px;background:#edf2f9;border-radius:4px;flex:1;margin-right:14px;overflow:hidden}
.mini-bar i{display:block;height:100%;border-radius:4px;background:linear-gradient(90deg,#3b82f6,#0ea5a4)}
.continue-grid{display:grid;grid-template-columns:1.55fr 1fr;gap:18px;margin-top:20px}
.continue-card{padding:22px 24px;border-radius:22px;border:1px solid #dbe8fb;background:linear-gradient(135deg,#f7fbff,#eef6ff);display:flex;gap:18px;align-items:center}
.continue-num{width:54px;height:54px;border-radius:16px;background:linear-gradient(135deg,#2f7bff,#1d4ed8);color:#fff;display:grid;place-items:center;font-weight:800;font-size:17px;flex:none;box-shadow:0 8px 20px rgba(47,123,255,.25)}
.continue-copy{flex:1;min-width:0}
.continue-copy .eyebrow{color:var(--blue-d)}
.continue-copy h3{margin:3px 0 5px;font-size:18px}
.continue-copy p{margin:0;color:var(--muted);font-size:12px}
.quick-card{padding:20px 22px;border-radius:22px;border:1px solid var(--line);background:#fff;display:flex;flex-direction:column;justify-content:center}
.quick-card .q-row{display:flex;align-items:center;justify-content:space-between;padding:8px 0;border-bottom:1px dashed #eef2f8;font-size:12.5px}
.quick-card .q-row:last-child{border-bottom:0}
.quick-card b{font-size:17px}
.module-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.module-card{padding:20px;border-radius:20px;background:#fff;border:1px solid var(--line);transition:.18s;position:relative;overflow:hidden}
.module-card:hover{transform:translateY(-2px);border-color:#cbdaf0;box-shadow:var(--shadow-sm)}
.module-card .m-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:12px}
.module-no{font-size:11px;font-weight:800;color:var(--blue);letter-spacing:1.4px}
.module-card h3{font-size:16px;margin:0 0 6px;letter-spacing:-.2px}
.module-card p{font-size:11.5px;color:var(--muted);line-height:1.6;margin:0 0 13px;height:37px;overflow:hidden}
.module-tags{display:flex;gap:6px;flex-wrap:wrap;margin-bottom:12px}
.module-foot{display:flex;align-items:center;gap:12px;font-size:10.5px;color:var(--faint);border-top:1px solid #f0f4fa;padding-top:11px}
.module-foot span{display:inline-flex;align-items:center;gap:4px}
.shared-mark{font-size:9.5px;padding:2px 6px;border-radius:5px;background:#f0f9ff;color:#0369a1;border:1px solid #bae6fd}

/* course page */
.crumb{display:flex;align-items:center;gap:7px;font-size:11.5px;color:var(--faint);margin-bottom:16px}
.crumb a:hover{color:var(--blue-d)}
.crumb span{color:#cbd5e1}
.course-hero{position:relative;overflow:hidden;border-radius:26px;padding:30px 34px;color:#fff;background:linear-gradient(135deg,#0c1830,#13294b)}
.course-hero::after{content:"";position:absolute;right:-100px;top:-140px;width:460px;height:460px;border-radius:50%;border:1px solid rgba(93,160,255,.22);box-shadow:0 0 0 50px rgba(93,160,255,.05),0 0 0 100px rgba(93,160,255,.03)}
.course-hero.c447{background:linear-gradient(135deg,#0a1b27,#0c3438)}
.course-hero .course-code{background:rgba(255,255,255,.1);color:#bfe0ff;border:1px solid rgba(255,255,255,.12)}
.course-hero h1{font-size:34px;margin:12px 0 8px;letter-spacing:-.6px}
.course-hero p{color:#a9bdd8;font-size:13px;max-width:720px;line-height:1.8;margin:0 0 18px}
.hero-chips{display:flex;gap:8px;flex-wrap:wrap}
.hero-chips span{font-size:11px;padding:5px 9px;border-radius:8px;background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.1);color:#c8d8ee}
.course-stat-row{display:flex;gap:22px;margin-top:20px}
.course-stat-row div{display:flex;flex-direction:column}
.course-stat-row b{font-size:23px;line-height:1.1}
.course-stat-row small{font-size:10px;color:#7f9cbf;margin-top:4px}
.course-tabs{display:flex;gap:4px;border-bottom:1px solid var(--line);margin:24px 0 20px}
.tab{padding:11px 15px;font-size:13px;color:var(--muted);border-bottom:2px solid transparent;margin-bottom:-1px;font-weight:600}
.tab.active{color:var(--blue-d);border-color:var(--blue)}
.tab span{font-size:10px;color:var(--faint);margin-left:4px}
.filter-row{display:flex;gap:9px;align-items:center;margin-bottom:14px}
.filter-input{flex:1;max-width:360px;height:38px;border:1px solid var(--line);border-radius:10px;padding:0 12px;background:#fff;font-size:12.5px}
.filter-input:focus{outline:0;border-color:#a9c7f5;box-shadow:0 0 0 3px rgba(47,123,255,.08)}
.course-module-list{display:flex;flex-direction:column;gap:11px}
.cm-row{display:grid;grid-template-columns:54px 1.55fr 1.1fr 170px;gap:18px;align-items:center;padding:17px 19px;border-radius:17px;background:#fff;border:1px solid var(--line);transition:.16s}
.cm-row:hover{border-color:#c8d9f1;box-shadow:var(--shadow-sm);transform:translateX(2px)}
.cm-no{width:44px;height:44px;border-radius:13px;background:#f1f6ff;display:grid;place-items:center;font-weight:800;color:var(--blue-d);font-size:14px}
.cm-title h3{margin:0 0 4px;font-size:15px;display:flex;align-items:center;gap:7px;flex-wrap:wrap}
.cm-title p{margin:0;font-size:11px;color:var(--muted);line-height:1.5}
.cm-points{display:flex;flex-wrap:wrap;gap:5px}
.cm-points span{font-size:10px;padding:2px 7px;background:#f8fafc;border:1px solid #eef2f7;border-radius:5px;color:#64748b;max-width:150px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.cm-side{display:flex;flex-direction:column;align-items:flex-end;gap:6px}
.cm-side .mini{display:flex;gap:9px;color:var(--faint);font-size:10px}
.cm-side .mini span{display:inline-flex;align-items:center;gap:3px}
.cm-progress{height:4px;width:110px;background:#edf2f9;border-radius:3px;overflow:hidden}
.cm-progress i{display:block;height:100%;background:linear-gradient(90deg,#3b82f6,#0ea5a4)}
.empty-soft{padding:34px;text-align:center;color:var(--faint);font-size:13px;border:1px dashed #dbe6f3;border-radius:18px;background:#fbfdff}

/* module */
.module-hero{padding:6px 2px 22px;border-bottom:1px solid var(--line)}
.module-hero .mh-top{display:flex;align-items:flex-start;justify-content:space-between;gap:20px}
.module-hero h1{font-size:36px;letter-spacing:-.8px;margin:4px 0 7px}
.module-hero .tagline{font-size:13.5px;color:var(--muted);margin:0 0 14px;max-width:860px}
.module-meta{display:flex;gap:9px;flex-wrap:wrap;align-items:center}
.module-meta .pill{padding:5px 10px}
.module-layout{display:grid;grid-template-columns:minmax(0,1fr) 310px;gap:26px;margin-top:22px;align-items:start}
.module-main{min-width:0}
.module-aside{position:sticky;top:92px;display:flex;flex-direction:column;gap:14px}
.subnav{display:flex;gap:2px;overflow:auto;border-bottom:1px solid var(--line);margin-bottom:20px;position:sticky;top:72px;background:rgba(244,247,252,.94);backdrop-filter:blur(8px);z-index:10;padding-top:4px}
.subnav button{padding:10px 14px;font-size:12.5px;color:var(--muted);border-bottom:2px solid transparent;white-space:nowrap;font-weight:600}
.subnav button.active{color:var(--blue-d);border-color:var(--blue)}
.reading{background:#fff;border:1px solid var(--line);border-radius:22px;padding:28px 30px;box-shadow:var(--shadow-sm)}
.reading h2{font-size:22px;margin:0 0 10px;letter-spacing:-.3px}
.reading h3{font-size:17px;margin:24px 0 8px}
.reading p{font-size:14px;line-height:1.95;color:#3a4a61;margin:0 0 13px}
.reading .lead{font-size:14.5px;color:#40526b}
.objective-row{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin:18px 0 6px}
.objective{padding:15px;border-radius:14px;background:#f8fbff;border:1px solid #e8f0fb}
.objective b{font-size:13px;display:block;margin-bottom:4px}
.objective span{font-size:11px;color:var(--muted);line-height:1.6}
.framework-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin:16px 0 8px}
.fw-step{padding:14px 13px;border-radius:14px;background:linear-gradient(180deg,#f8fbff,#fff);border:1px solid #e8eff9;position:relative}
.fw-step .n{font-size:10px;font-weight:800;color:var(--blue);letter-spacing:1px}
.fw-step b{display:block;font-size:12.5px;margin:5px 0 4px}
.fw-step span{font-size:10.5px;color:var(--muted);line-height:1.55}
.point-list{display:flex;flex-direction:column;gap:11px;margin-top:18px}
.point-card{border:1px solid var(--line);border-radius:16px;background:#fff;overflow:hidden;transition:.18s}
.point-card:hover{border-color:#cfdff5}
.point-card.open{border-color:#bcd4f4;box-shadow:0 8px 24px rgba(47,123,255,.06)}
.point-head{display:grid;grid-template-columns:42px 1fr auto;gap:13px;align-items:center;padding:15px 16px;cursor:pointer}
.point-head .pid{font-size:9.5px;color:#94a3b8;font-weight:700;letter-spacing:.3px}
.point-head h4{margin:0;font-size:14px;line-height:1.35}
.point-head .pmeta{display:flex;gap:6px;align-items:center}
.point-body{padding:0 18px 18px 71px;border-top:1px dashed #edf2f9;margin-top:0;padding-top:16px}
.tree{font-size:10.5px;color:#94a3b8;margin-bottom:12px}
.depth{font-size:9.5px;padding:2px 7px;border-radius:5px;background:var(--blue-soft);color:var(--blue-d);font-weight:700}
.depth.熟练{background:#fff3e6;color:#b45309}
.depth.理解{background:#eef4ff;color:#1d4ed8}
.depth.了解{background:#f1f5f9;color:#64748b}
.difficulty{display:inline-flex;gap:2px}
.difficulty i{width:4px;height:9px;border-radius:2px;background:#e2e8f0}
.difficulty i.on{background:var(--blue)}
.point-body p{font-size:13.5px;line-height:1.9;color:#40526b;margin:0 0 10px}
.info-block{margin-top:12px;padding:12px 14px;border-radius:11px;background:#f8fbff;border:1px solid #eaf1fb}
.info-block.amber{background:#fffaf0;border-color:#fdecc8}
.info-block.green{background:#f4fcf9;border-color:#d8f2e8}
.info-block b{font-size:10.5px;letter-spacing:.6px;color:#64748b;display:block;margin-bottom:5px}
.info-block ul{margin:0;padding-left:17px}
.info-block li{font-size:12.5px;line-height:1.75;color:#40526b}
.dag{display:flex;align-items:center;flex-wrap:wrap;gap:7px;font-size:10px}
.dag .node{padding:3px 8px;border-radius:6px;background:#f1f5f9;color:#64748b;border:1px solid #e8eef6}
.dag .node.active{background:var(--blue-soft);border-color:#c7dbff;color:var(--blue-d);font-weight:600}
.dag .arrow{color:#cbd5e1}
.aside-card{padding:18px;border-radius:18px;background:#fff;border:1px solid var(--line)}
.aside-card h3{font-size:13px;margin:0 0 3px}
.aside-card .hint{font-size:10.5px;color:var(--faint);line-height:1.55;margin:0 0 12px}
.note-quick{background:linear-gradient(135deg,#f4f9ff,#eef7ff);border-color:#dbeafd}
.note-quick textarea{width:100%;min-height:84px;border:1px solid #d6e6fb;border-radius:10px;padding:10px;font-size:12px;line-height:1.65;resize:vertical;background:#fff}
.note-quick textarea:focus{outline:0;border-color:#9fc4fb;box-shadow:0 0 0 3px rgba(47,123,255,.08)}
.note-quick .row{margin-top:8px;justify-content:space-between}
.note-item{padding:10px 0;border-bottom:1px dashed #eef2f8}
.note-item:last-child{border-bottom:0;padding-bottom:0}
.note-item .quote{font-size:10.5px;color:#7c8da5;border-left:2px solid #cfe0f7;padding-left:8px;margin-bottom:5px;line-height:1.55}
.note-item .body{font-size:12px;color:#334155;line-height:1.65;white-space:pre-wrap}
.note-item .meta{display:flex;justify-content:space-between;align-items:center;margin-top:6px;font-size:9.5px;color:#a3b1c4}
.note-item .meta button{font-size:9.5px;color:#94a3b8}
.note-item .meta button:hover{color:var(--rose)}
.progress-box{display:flex;flex-direction:column;gap:8px}
.progress-box .bar{height:6px;border-radius:4px;background:#edf2f9;overflow:hidden}
.progress-box .bar i{display:block;height:100%;background:linear-gradient(90deg,#2f7bff,#0ea5a4)}
.media-card{padding:18px}
.media-card .cover{position:relative;border-radius:12px;overflow:hidden;background:#0b1220;aspect-ratio:16/9}
.media-card .cover img{width:100%;height:100%;object-fit:cover;display:block;opacity:.9}
.media-card .cover .play{position:absolute;inset:0;display:grid;place-items:center;background:linear-gradient(180deg,transparent,rgba(8,16,30,.45))}
.media-card .cover .play button{width:48px;height:48px;border-radius:50%;background:rgba(255,255,255,.92);color:#0f172a;display:grid;place-items:center;font-size:18px;box-shadow:0 8px 24px rgba(0,0,0,.25)}
.media-tabs{display:grid;grid-template-columns:repeat(4,1fr);gap:6px;margin-top:10px}
.media-tab{font-size:10px;padding:7px 3px;border-radius:7px;background:#f8fafc;color:#64748b;text-align:center;border:1px solid #eef2f7}
.media-tab.active{background:var(--blue-soft);color:var(--blue-d);border-color:#cfe0ff;font-weight:600}
.media-tab:hover{border-color:#cfdef5}
.aside-note{font-size:10px;color:#a3b1c4;line-height:1.6}

/* quiz */
.quiz-wrap{max-width:880px}
.quiz-intro{display:flex;align-items:center;justify-content:space-between;gap:14px;padding:14px 16px;border-radius:14px;background:#f7fbff;border:1px solid #e5effc;margin-bottom:18px}
.quiz-intro p{margin:0;font-size:12px;color:#52657d}
.q-item{padding:20px 0;border-bottom:1px solid #eef2f8}
.q-item:last-child{border-bottom:0}
.q-stem{font-size:14px;line-height:1.7;margin:0 0 12px;font-weight:600}
.q-stem .qno{color:var(--blue);margin-right:6px}
.option{display:flex;align-items:flex-start;gap:9px;padding:10px 12px;border:1px solid #e8eef7;border-radius:10px;margin-bottom:7px;font-size:12.5px;color:#40526b;cursor:pointer;transition:.14s;background:#fff}
.option:hover{border-color:#c9dcf7;background:#fbfdff}
.option input{margin-top:3px;accent-color:var(--blue)}
.option.correct{border-color:#86efac;background:#f0fdf4;color:#166534}
.option.wrong{border-color:#fecaca;background:#fff7f7;color:#991b1b}
.explain{margin-top:10px;padding:10px 12px;border-radius:9px;background:#f8fafc;font-size:11.5px;color:#52657d;line-height:1.7}
.quiz-result{display:flex;align-items:center;gap:16px;padding:18px 20px;border-radius:16px;background:linear-gradient(135deg,#f0f9ff,#ecfdf5);border:1px solid #d5f0ec;margin-bottom:18px}
.quiz-result b{font-size:28px;color:#0f766e}
.quiz-result span{font-size:12px;color:#64748b}

/* exam */
.mock-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.mock-card{padding:22px;border-radius:20px;background:#fff;border:1px solid var(--line);display:flex;flex-direction:column;min-height:230px;transition:.18s}
.mock-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-sm);border-color:#cfdef5}
.mock-card .top{display:flex;justify-content:space-between;align-items:flex-start}
.mock-code{font-size:10px;letter-spacing:1px;color:var(--faint);font-weight:700}
.mock-card h3{font-size:18px;margin:10px 0 5px}
.mock-card p{font-size:11.5px;color:var(--muted);line-height:1.6;margin:0 0 14px}
.mock-meta{display:flex;gap:12px;font-size:10.5px;color:var(--faint);margin-bottom:16px}
.mock-meta b{color:var(--ink-2);font-size:12px}
.score-hero{padding:22px;border-radius:18px;background:linear-gradient(135deg,#0b1a33,#12345a);color:#fff;display:flex;align-items:center;justify-content:space-between;gap:18px;margin-bottom:18px}
.score-hero b{font-size:34px;letter-spacing:-1px;color:#5eead4}
.score-hero span{font-size:11px;color:#a9c0df}
.exam-shell{max-width:1050px;margin:0 auto}
.exam-bar{position:sticky;top:72px;z-index:20;display:flex;align-items:center;gap:14px;padding:11px 16px;border-radius:14px;background:rgba(255,255,255,.94);backdrop-filter:blur(10px);border:1px solid var(--line);box-shadow:var(--shadow-sm);margin-bottom:18px}
.exam-bar .timer{margin-left:auto;font-family:Consolas,monospace;font-size:17px;font-weight:700;color:var(--ink);letter-spacing:.5px}
.exam-bar .timer.warn{color:var(--rose)}
.exam-sec{margin-bottom:18px;padding:20px 22px;border-radius:18px;background:#fff;border:1px solid var(--line)}
.exam-sec h3{font-size:15px;margin:0 0 5px}
.exam-sec .sec-note{font-size:11px;color:var(--faint);margin:0 0 6px}
.exam-q{padding:16px 0;border-bottom:1px dashed #edf2f9}
.exam-q:last-child{border-bottom:0}
.exam-q .stem{font-size:13.5px;line-height:1.7;margin:0 0 9px;font-weight:600}
.exam-q textarea{width:100%;min-height:90px;border:1px solid var(--line);border-radius:10px;padding:10px 12px;font-size:12.5px;line-height:1.7;resize:vertical}
.exam-q textarea:focus{outline:0;border-color:#a9c7f5;box-shadow:0 0 0 3px rgba(47,123,255,.08)}
.answer-box{margin-top:10px;padding:12px 14px;border-radius:10px;background:#f8fbff;border:1px solid #e7f0fb;font-size:12px;line-height:1.8;color:#3f526a}
.answer-box b{color:var(--blue-d)}
.result-title{display:flex;align-items:center;gap:10px;margin:6px 0 4px}
.result-title h1{font-size:28px;margin:0}
.result-sub{color:var(--muted);font-size:12px;margin:0 0 18px}

/* notes page */
.notes-layout{display:grid;grid-template-columns:1fr 300px;gap:20px;align-items:start}
.notes-list{display:flex;flex-direction:column;gap:12px}
.note-card{padding:18px 20px;border-radius:16px;background:#fff;border:1px solid var(--line);position:relative}
.note-card .quote{font-size:11.5px;color:#7c8da5;border-left:3px solid #cfe0f7;padding-left:10px;margin-bottom:8px;line-height:1.6}
.note-card .content{font-size:13px;line-height:1.8;color:#334155;white-space:pre-wrap}
.note-card .foot{display:flex;justify-content:space-between;align-items:center;margin-top:12px;font-size:10.5px;color:#a3b1c4;border-top:1px dashed #eef2f8;padding-top:10px}
.note-actions{display:flex;gap:8px}
.note-actions button{font-size:10.5px;color:#94a3b8}
.note-actions button:hover{color:var(--blue-d)}
.note-actions button.del:hover{color:var(--rose)}
.stat-mini-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:8px}
.stat-mini{padding:12px;border-radius:11px;background:#f8fbff;border:1px solid #eaf1fb}
.stat-mini b{font-size:18px;display:block}
.stat-mini span{font-size:10px;color:var(--muted)}

/* search */
.search-overlay{position:fixed;inset:0;z-index:100;background:rgba(8,16,30,.55);backdrop-filter:blur(7px);display:flex;align-items:flex-start;justify-content:center;padding-top:11vh}
.search-modal{width:min(780px,92vw);max-height:74vh;background:#fff;border-radius:22px;box-shadow:0 30px 80px rgba(0,0,0,.3);display:flex;flex-direction:column;overflow:hidden}
.search-input-row{display:flex;align-items:center;gap:12px;padding:17px 20px;border-bottom:1px solid var(--line)}
.search-input-row svg{font-size:20px;color:var(--blue)}
.search-input-row input{flex:1;border:0;outline:0;font-size:16px;background:none}
.search-hints{display:flex;align-items:center;gap:7px;padding:10px 20px;font-size:10.5px;color:#94a3b8;border-bottom:1px solid #f1f5f9}
.search-hints button{font-size:10.5px;background:#f4f7fc;padding:3px 8px;border-radius:6px;color:#64748b}
.search-hints button:hover{background:var(--blue-soft);color:var(--blue-d)}
.search-results{overflow:auto;padding:8px 10px 14px}
.s-result{display:flex;gap:11px;padding:11px 12px;border-radius:11px;cursor:pointer}
.s-result:hover{background:#f6f9ff}
.s-badge{font-size:9px;height:fit-content;padding:3px 6px;border-radius:5px;background:var(--blue-soft);color:var(--blue-d);flex:none;margin-top:2px}
.s-result b{font-size:12.5px;display:block}
.s-result p{margin:2px 0 0;font-size:11px;color:var(--muted);line-height:1.55}
.s-result .s-mod{margin-left:auto;font-size:9.5px;color:#a3b1c4;flex:none}
.search-empty{padding:34px 20px;text-align:center;color:#94a3b8;font-size:12px}

/* drawer */
.drawer-mask{position:fixed;inset:0;z-index:80;background:rgba(8,16,30,.45);backdrop-filter:blur(3px)}
.note-drawer{position:fixed;z-index:90;top:0;right:0;bottom:0;width:min(430px,94vw);background:#fff;box-shadow:-20px 0 60px rgba(0,0,0,.16);display:flex;flex-direction:column;animation:slideIn .2s ease}
@keyframes slideIn{from{transform:translateX(30px);opacity:.4}to{transform:none;opacity:1}}
.drawer-head{display:flex;justify-content:space-between;align-items:flex-start;padding:22px 22px 14px;border-bottom:1px solid var(--line)}
.drawer-head h3{font-size:18px;margin:2px 0 0}
.drawer-body{padding:18px 22px 24px;overflow:auto}
.field{margin-bottom:13px}
.field label{display:block;font-size:10.5px;letter-spacing:.4px;color:#64748b;margin-bottom:5px;font-weight:700}
.field textarea,.field input{width:100%;border:1px solid var(--line);border-radius:10px;padding:10px 11px;font-size:12.5px;line-height:1.65;background:#fff}
.field textarea{min-height:150px;resize:vertical}
.field textarea:focus,.field input:focus{outline:0;border-color:#a9c7f5;box-shadow:0 0 0 3px rgba(47,123,255,.08)}
.color-row{display:flex;gap:8px}
.color-dot{width:22px;height:22px;border-radius:50%;border:2px solid #fff;box-shadow:0 0 0 1px #dbe4f0}
.color-dot.active{box-shadow:0 0 0 2px var(--blue)}
.drawer-foot{margin-top:auto;display:flex;gap:8px;padding-top:12px;border-top:1px solid #f1f5f9}
.toast{position:fixed;z-index:120;left:50%;bottom:28px;transform:translateX(-50%);background:#0f172a;color:#fff;font-size:12px;padding:10px 16px;border-radius:10px;box-shadow:0 14px 40px rgba(0,0,0,.25)}

/* toolbar button group */
.seg{display:inline-flex;background:#f1f5fb;padding:3px;border-radius:9px;gap:2px}
.seg button{padding:6px 10px;border-radius:7px;font-size:11px;color:#64748b}
.seg button.active{background:#fff;color:var(--blue-d);box-shadow:0 2px 6px rgba(15,23,42,.08);font-weight:600}

@media (max-width:1200px){
  .hero-grid{grid-template-columns:1fr}
  .hero-stats{grid-template-columns:repeat(4,1fr)}
  .module-grid{grid-template-columns:repeat(2,1fr)}
  .mock-grid{grid-template-columns:repeat(2,1fr)}
  .module-layout{grid-template-columns:1fr}
  .module-aside{position:static;display:grid;grid-template-columns:1fr 1fr}
  .cm-row{grid-template-columns:48px 1.4fr 120px}
  .cm-points{display:none}
}
@media (max-width:900px){
  .sidebar{transform:translateX(-100%);transition:.22s;box-shadow:20px 0 60px rgba(0,0,0,.2)}
  .sidebar.open{transform:none}
  .main-wrap{margin-left:0;width:100%;max-width:100%}
  .menu-btn{display:grid}
  .topbar{padding:0 18px;gap:10px;min-width:0}
  .top-actions{flex:none}
  .top-pill{display:none}
  .view{padding:20px 16px 50px;width:100%;max-width:100%}
  .hero{padding:26px 22px;width:100%}
  .hero-grid,.course-grid,.continue-grid,.notes-layout{min-width:0}
  .hero h1{font-size:28px;overflow-wrap:anywhere}
  .hero p{overflow-wrap:anywhere}
  .hero-stats{grid-template-columns:repeat(2,1fr);min-width:0}
  .course-grid,.continue-grid,.notes-layout{grid-template-columns:1fr}
  .course-card{min-width:0}
  .course-meta{flex-wrap:wrap}
  .module-grid,.mock-grid{grid-template-columns:1fr}
  .objective-row,.framework-grid{grid-template-columns:1fr 1fr}
  .module-aside{grid-template-columns:1fr}
  .cm-row{grid-template-columns:44px 1fr;gap:10px}
  .cm-side{grid-column:2;align-items:flex-start}
  .module-hero h1{font-size:28px}
  .reading{padding:20px 18px}
  .point-body{padding-left:18px}
  .user-meta{display:none}
  .search-trigger kbd{display:none}
}
@media (max-width:560px){
  .hero h1{font-size:24px}
  .hero-stats{grid-template-columns:1fr 1fr}
  .course-card h3{font-size:20px}
  .course-stat-row{gap:14px;flex-wrap:wrap}
  .module-hero .mh-top{flex-direction:column}
  .objective-row,.framework-grid{grid-template-columns:1fr}
  .subnav{top:66px}
}