:root{
  --navy:#0f2c4d;
  --navy-2:#163b63;
  --blue:#1f6fb8;
  --blue-soft:#e8f1fa;
  --gold:#c89b3c;
  --gold-soft:#fbf3df;
  --teal:#1f9e8f;
  --ink:#1d2733;
  --ink-2:#44515f;
  --line:#e3e9f0;
  --bg:#f4f7fb;
  --card:#ffffff;
  --ok:#2f9e57;
  --warn:#d98324;
  --danger:#cf4b3a;
  --radius:14px;
  --shadow:0 6px 22px rgba(15,44,77,.08);
  --shadow-2:0 2px 10px rgba(15,44,77,.06);
  --maxw:1080px;
  --font:"PingFang SC","Microsoft YaHei","Hiragino Sans GB",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;font-family:var(--font);color:var(--ink);background:var(--bg);
  line-height:1.75;font-size:15.5px;-webkit-font-smoothing:antialiased;
}
a{color:var(--blue);text-decoration:none}
img{max-width:100%}
h1,h2,h3,h4{color:var(--navy);line-height:1.35;font-weight:800}
h2{font-size:25px;margin:6px 0 14px}
h3{font-size:19px;margin:22px 0 10px}
h4{font-size:16px;margin:16px 0 8px}
p{margin:10px 0}
ul,ol{padding-left:22px;margin:10px 0}
li{margin:5px 0}

/* ---------- Layout ---------- */
#app{display:flex;min-height:100vh}
.sidebar{
  width:286px;flex:0 0 286px;background:linear-gradient(180deg,var(--navy),var(--navy-2));
  color:#dfe9f4;position:sticky;top:0;height:100vh;overflow-y:auto;padding:18px 0;
}
.sidebar .brand{padding:6px 22px 16px;border-bottom:1px solid rgba(255,255,255,.08)}
.sidebar .brand .logo{font-size:19px;font-weight:900;color:#fff;letter-spacing:.5px}
.sidebar .brand .sub{font-size:12px;color:#9fb6d0;margin-top:3px}
.sidebar nav{padding:10px 12px}
.nav-group{font-size:11.5px;color:#7e98b8;text-transform:uppercase;letter-spacing:1px;margin:14px 10px 6px}
.nav-item{
  display:flex;align-items:center;gap:10px;padding:9px 12px;margin:2px 0;border-radius:9px;
  color:#cddd ;color:#cdddee;font-size:14px;cursor:pointer;transition:.15s;border:1px solid transparent;
}
.nav-item:hover{background:rgba(255,255,255,.07)}
.nav-item.active{background:var(--blue);color:#fff;font-weight:700}
.nav-item .num{
  flex:0 0 22px;height:22px;border-radius:6px;background:rgba(255,255,255,.14);
  display:flex;align-items:center;justify-content:center;font-size:12px;font-weight:700
}
.nav-item.done .num{background:var(--ok);color:#fff}
.nav-item .dot{margin-left:auto;width:8px;height:8px;border-radius:50%;background:transparent}
.nav-item.done .dot{background:var(--ok)}

.main{flex:1;min-width:0;display:flex;flex-direction:column}
.topbar{
  position:sticky;top:0;z-index:20;background:rgba(255,255,255,.92);backdrop-filter:blur(8px);
  border-bottom:1px solid var(--line);padding:10px 30px;display:flex;align-items:center;gap:16px
}
.topbar .pgtitle{font-weight:800;color:var(--navy);font-size:15px}
.topbar .progress-wrap{flex:1;max-width:420px}
.progress-track{height:8px;border-radius:6px;background:var(--line);overflow:hidden}
.progress-fill{height:100%;width:0;background:linear-gradient(90deg,var(--blue),var(--teal));transition:width .4s}
.progress-label{font-size:12px;color:var(--ink-2);margin-top:3px}
.topbar .menu-btn{display:none;border:none;background:var(--blue);color:#fff;border-radius:8px;padding:7px 12px;font-size:14px;cursor:pointer}
.topbar .back-btn{display:inline-flex;align-items:center;gap:4px;background:rgba(255,255,255,.9);color:var(--navy);border:1.5px solid var(--blue);border-radius:8px;padding:6px 14px;font-size:13px;font-weight:600;cursor:pointer;text-decoration:none;transition:all .2s;margin-right:6px}
.topbar .back-btn:hover{background:var(--blue);color:#fff;transform:translateX(-2px);box-shadow:0 2px 8px rgba(37,99,235,.3)}
.topbar .back-btn:active{transform:translateX(0)}
.content{padding:26px 30px 80px;max-width:var(--maxw);width:100%;margin:0 auto}

/* ---------- Hero ---------- */
.hero{
  background:linear-gradient(120deg,var(--navy),var(--navy-2) 60%,#1c4a7d);
  color:#fff;border-radius:18px;padding:38px 36px;position:relative;overflow:hidden;box-shadow:var(--shadow)
}
.hero:after{content:"";position:absolute;right:-60px;top:-60px;width:280px;height:280px;border-radius:50%;
  background:radial-gradient(circle,rgba(200,155,60,.35),transparent 70%)}
.hero h1{color:#fff;font-size:32px;margin:0 0 8px}
.hero .tag{display:inline-block;background:rgba(200,155,60,.22);color:var(--gold-soft);
  border:1px solid rgba(200,155,60,.5);padding:4px 12px;border-radius:20px;font-size:13px;margin-bottom:14px}
.hero p{color:#cfe0f2;max-width:680px}
.hero .stats{display:flex;flex-wrap:wrap;gap:26px;margin-top:22px}
.hero .stat .n{font-size:28px;font-weight:900;color:var(--gold)}
.hero .stat .l{font-size:12.5px;color:#a9c2dd}

/* ---------- Cards / modules ---------- */
.module-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(248px,1fr));gap:16px;margin-top:22px}
.mcard{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:18px;
  box-shadow:var(--shadow-2);cursor:pointer;transition:.18s;position:relative;overflow:hidden
}
.mcard:hover{transform:translateY(-3px);box-shadow:var(--shadow);border-color:var(--blue)}
.mcard .ic{width:42px;height:42px;border-radius:11px;background:var(--blue-soft);color:var(--blue);
  display:flex;align-items:center;justify-content:center;font-size:21px;font-weight:900;margin-bottom:12px}
.mcard h3{margin:0 0 6px;font-size:16.5px}
.mcard p{font-size:13px;color:var(--ink-2);margin:0}
.mcard .go{margin-top:12px;font-size:13px;color:var(--blue);font-weight:700}

/* ---------- Section ---------- */
.section{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:26px 30px;margin:22px 0;box-shadow:var(--shadow-2);scroll-margin-top:74px}
.section .eyebrow{font-size:12.5px;font-weight:800;color:var(--gold);letter-spacing:1.5px;text-transform:uppercase}
.section > h2{display:flex;align-items:center;gap:10px}
.section > h2 .badge{background:var(--navy);color:#fff;font-size:13px;padding:3px 10px;border-radius:8px;font-weight:800}

/* ---------- Callouts ---------- */
.callout{border-radius:12px;padding:14px 16px;margin:14px 0;border:1px solid;display:flex;gap:12px}
.callout .ci{flex:0 0 26px;font-size:20px;line-height:1.4}
.callout .ct{flex:1}
.callout.tip{background:#eef7f0;border-color:#bfe3c9;color:#1f5b34}
.callout.must{background:var(--gold-soft);border-color:#ecd9a0;color:#7a5a13}
.callout.warn{background:#fdf1e7;border-color:#f3cf9f;color:#8a4f17}
.callout.info{background:var(--blue-soft);border-color:#c6ddf3;color:#15466f}
.callout.danger{background:#fbeceb;border-color:#f0c4be;color:#9a3225}
.callout b{color:inherit}

/* ---------- Step / process ---------- */
.steps{counter-reset:s;padding:0;margin:14px 0;list-style:none}
.steps > li{position:relative;padding:14px 16px 14px 56px;margin:10px 0;background:var(--bg);
  border:1px solid var(--line);border-radius:12px}
.steps > li:before{counter-increment:s;content:counter(s);position:absolute;left:14px;top:14px;
  width:30px;height:30px;border-radius:50%;background:var(--blue);color:#fff;font-weight:800;
  display:flex;align-items:center;justify-content:center}
.steps > li h4{margin:0 0 4px}
.steps > li .meta{font-size:12.5px;color:var(--ink-2)}

/* ---------- Flow ---------- */
.flow{display:flex;flex-wrap:wrap;gap:12px;margin:18px 0;align-items:stretch}
.flow .node{flex:1 1 180px;background:var(--blue-soft);border:1px solid #c6ddf3;border-radius:12px;
  padding:14px;min-width:160px}
.flow .node .t{font-weight:800;color:var(--navy);font-size:15px}
.flow .node .d{font-size:13px;color:var(--ink-2);margin-top:4px}
.flow .arrow{flex:0 0 26px;display:flex;align-items:center;justify-content:center;color:var(--blue);font-size:22px;font-weight:900}
.flow.vertical{flex-direction:column}
.flow.vertical .arrow{transform:rotate(90deg);flex-basis:auto;height:26px}

.phase-row{display:grid;grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:14px;margin:16px 0}
.phase{border:1px solid var(--line);border-radius:12px;padding:16px;background:var(--card);position:relative;overflow:hidden}
.phase .ph{font-size:12px;font-weight:800;color:#fff;background:var(--blue);display:inline-block;padding:2px 10px;border-radius:6px;margin-bottom:8px}
.phase .pt{font-weight:800;color:var(--navy);font-size:16px}
.phase .pd{font-size:13px;color:var(--ink-2);margin-top:6px}
.phase .cycle{margin-top:8px;font-size:12px;color:var(--gold);font-weight:700}

/* ---------- Table ---------- */
.tbl{width:100%;border-collapse:collapse;margin:14px 0;font-size:14px}
.tbl th,.tbl td{border:1px solid var(--line);padding:9px 12px;text-align:left;vertical-align:top}
.tbl th{background:var(--navy);color:#fff;font-weight:700}
.tbl tr:nth-child(even) td{background:#f8fafd}
.tbl td .yes{color:var(--ok);font-weight:700}
.tbl td .no{color:var(--danger);font-weight:700}

/* ---------- Figure ---------- */
figure.shot{margin:16px 0;border:1px solid var(--line);border-radius:12px;overflow:hidden;background:#fff;box-shadow:var(--shadow-2)}
figure.shot img{display:block;width:100%}
figure.shot figcaption{background:#f8fafd;padding:9px 14px;font-size:12.5px;color:var(--ink-2);border-top:1px solid var(--line)}
.two-col{display:grid;grid-template-columns:1fr 1fr;gap:16px}
@media(max-width:760px){.two-col{grid-template-columns:1fr}}

/* ---------- Tabs / Accordion ---------- */
.tabs{margin:14px 0}
.tab-head{display:flex;flex-wrap:wrap;gap:6px;border-bottom:2px solid var(--line);margin-bottom:0}
.tab-head .tb{padding:9px 16px;cursor:pointer;font-weight:700;color:var(--ink-2);border-radius:8px 8px 0 0;border:1px solid transparent;border-bottom:none}
.tab-head .tb.active{color:var(--navy);background:var(--blue-soft);border-color:var(--line)}
.tab-body{border:1px solid var(--line);border-top:none;border-radius:0 0 12px 12px;padding:16px;background:#fff}
.tab-pane{display:none}
.tab-pane.active{display:block}

.acc{border:1px solid var(--line);border-radius:10px;margin:8px 0;overflow:hidden;background:#fff}
.acc .ah{padding:13px 16px;cursor:pointer;font-weight:700;color:var(--navy);display:flex;justify-content:space-between;align-items:center;background:#f8fafd}
.acc .ah:hover{background:var(--blue-soft)}
.acc .ah .pm{color:var(--blue);font-size:20px;transition:.2s}
.acc .ab{max-height:0;overflow:hidden;transition:max-height .3s ease;padding:0 16px}
.acc.open .ab{padding:14px 16px}
.acc.open .ah .pm{transform:rotate(45deg)}

/* ---------- KPI pills ---------- */
.pills{display:flex;flex-wrap:wrap;gap:10px;margin:12px 0}
.pill{background:var(--blue-soft);border:1px solid #c6ddf3;color:var(--navy);border-radius:20px;padding:6px 14px;font-size:13px;font-weight:700}
.pill.gold{background:var(--gold-soft);border-color:#ecd9a0;color:#7a5a13}
.pill.teal{background:#e6f6f3;border-color:#bfe7e1;color:#0f6b5f}

/* ---------- Quiz / Memory ---------- */
.quiz-q{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:18px;margin:14px 0;box-shadow:var(--shadow-2)}
.quiz-q .q{font-weight:800;color:var(--navy);margin-bottom:12px}
.quiz-q .opts{display:flex;flex-direction:column;gap:8px}
.quiz-q .opt{padding:11px 14px;border:1px solid var(--line);border-radius:9px;cursor:pointer;transition:.15s;background:#fff}
.quiz-q .opt:hover{border-color:var(--blue);background:var(--blue-soft)}
.quiz-q .opt.correct{background:#eef7f0;border-color:var(--ok);color:#1f5b34;font-weight:700}
.quiz-q .opt.wrong{background:#fbeceb;border-color:var(--danger);color:#9a3225}
.quiz-q .exp{margin-top:12px;font-size:13.5px;color:var(--ink-2);border-top:1px dashed var(--line);padding-top:10px;display:none}
.quiz-q.answered .exp{display:block}
.quiz-bar{display:flex;gap:14px;align-items:center;flex-wrap:wrap;background:var(--navy);color:#fff;border-radius:12px;padding:14px 18px;margin:14px 0}
.quiz-bar .score{font-size:22px;font-weight:900;color:var(--gold)}

/* flashcard */
.fc-wrap{display:flex;flex-wrap:wrap;gap:14px;margin:14px 0}
.flash{width:230px;height:150px;perspective:1000px;cursor:pointer}
.flash .inner{position:relative;width:100%;height:100%;transition:transform .5s;transform-style:preserve-3d}
.flash.flip .inner{transform:rotateY(180deg)}
.flash .face{position:absolute;inset:0;backface-visibility:hidden;border-radius:12px;padding:16px;display:flex;flex-direction:column;justify-content:center;box-shadow:var(--shadow-2)}
.flash .front{background:linear-gradient(135deg,var(--navy),var(--navy-2));color:#fff}
.flash .front .ft{font-size:15px;font-weight:800}
.flash .front .fh{font-size:11.5px;color:#9fb6d0;margin-top:6px}
.flash .back{background:#fff;border:1px solid var(--line);transform:rotateY(180deg);color:var(--ink);font-size:13px}
.flash .back .bt{font-weight:700;color:var(--blue);margin-bottom:4px}

/* checklist */
.chk{list-style:none;padding:0;margin:10px 0}
.chk li{display:flex;gap:10px;align-items:flex-start;padding:8px 0;border-bottom:1px dashed var(--line)}
.chk li .box{flex:0 0 20px;height:20px;border-radius:5px;border:2px solid var(--blue);margin-top:3px}
.chk li.done .box{background:var(--ok);border-color:var(--ok)}
.chk li.done .box:after{content:"✓";color:#fff;display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:900;height:100%}
.chk li.done span{text-decoration:line-through;color:var(--ink-2)}

/* ---------- utilities ---------- */
.kbd{background:#eef2f7;border:1px solid var(--line);border-bottom-width:2px;border-radius:6px;padding:1px 7px;font-size:13px;font-family:ui-monospace,Menlo,Consolas,monospace}
.muted{color:var(--ink-2);font-size:13.5px}
.center{text-align:center}
.divider{height:1px;background:var(--line);margin:22px 0}
.tag-row{display:flex;flex-wrap:wrap;gap:8px;margin:10px 0}

.footer{padding:26px 30px;color:var(--ink-2);font-size:12.5px;text-align:center;border-top:1px solid var(--line)}

@media(max-width:900px){
  .sidebar{position:fixed;left:0;top:0;z-index:50;transform:translateX(-100%);transition:.25s;box-shadow:var(--shadow)}
  .sidebar.open{transform:translateX(0)}
  .topbar .menu-btn{display:block}
  .content{padding:18px 16px 70px}
  .section{padding:20px 16px}
  .hero{padding:26px 20px}
}