:root{
  --bg:#0f172a; --panel:#0b1220; --panel-2:#101826; --text:#e5e7eb; --muted:#94a3b8; --border:#1f2937;
  --accent:#38bdf8; --accent-2:#22c55e; --accent-3:#f59e0b; --ring:rgba(56,189,248,.5);
  /* high-contrast component tokens (dark default) */
  --chip-bg:#0e1526; --chip-text:#e5e7eb; --chip-border:#2a3a55; --chip-active-text:#0b1220;
  --choice-bg:#0b1220; --choice-text:#e5e7eb; --choice-border:#1f2a3d;
  /* NIST CSF (ID, PR, DE, RS, RC) */
  --csf-id:#7dd3fc; --csf-id-bg:rgba(125,211,252,.18); --csf-id-border:#38bdf8;
  --csf-pr:#f59e0b; --csf-pr-bg:rgba(245,158,11,.18); --csf-pr-border:#f59e0b;
  --csf-de:#a78bfa; --csf-de-bg:rgba(167,139,250,.18); --csf-de-border:#8b5cf6;
  --csf-rs:#ef4444; --csf-rs-bg:rgba(239,68,68,.18); --csf-rs-border:#ef4444;
  --csf-rc:#22c55e; --csf-rc-bg:rgba(34,197,94,.18); --csf-rc-border:#22c55e;
}
*{box-sizing:border-box}
html,body{height:100%}
body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,Ubuntu,Cantarell,Noto Sans,Arial;background:radial-gradient(1200px 800px at 15% -10%,#1f2937 0%,#0b1220 50%,#0f172a 100%);color:var(--text)}
.app-header{display:flex;justify-content:space-between;align-items:center;padding:14px 18px;border-bottom:1px solid var(--border);background:linear-gradient(135deg,rgba(56,189,248,.12),rgba(34,197,94,.12))}
.brand{display:flex;gap:12px;align-items:center}
.badge{width:44px;height:44px;border-radius:10px;background:linear-gradient(145deg,#0ea5e9,#22c55e);display:grid;place-items:center;color:#fff;font-weight:800}
.titles h1{margin:0;font-size:20px}
.subtitle{margin:2px 0 0;color:var(--muted);font-size:13px}

.tabs{display:flex;gap:10px;padding:10px 14px;border-bottom:1px solid var(--border);background:#0b1220;position:sticky;top:0;z-index:2}
.tab{background:transparent;color:var(--text);border:1px solid var(--border);border-radius:999px;padding:8px 14px;cursor:pointer}
.tab.active{background:var(--panel-2);box-shadow:0 0 0 2px var(--ring) inset}

.views{max-width:1200px;margin:0 auto;padding:18px}
.view{display:none}
.view.active{display:block}

.panel{background:linear-gradient(180deg,rgba(255,255,255,.03),rgba(255,255,255,.01));border:1px solid var(--border);border-radius:14px;padding:16px;box-shadow:0 8px 28px rgba(0,0,0,.35);margin-bottom:16px}
.hero{display:grid;grid-template-columns:1.2fr .8fr;gap:16px;align-items:center}
.hero-text h2{margin:4px 0 8px}
.pills{display:flex;gap:10px;flex-wrap:wrap;margin:10px 0}
.pill{display:inline-flex;gap:8px;align-items:center;border:1px solid #243142;background:#0b1220;padding:6px 10px;border-radius:999px}
.dot{width:8px;height:8px;border-radius:999px;display:inline-block}
.ig1{background:var(--accent)}.ig2{background:var(--accent-2)}.ig3{background:var(--accent-3)}
.csf-id{background:var(--csf-id)}.csf-pr{background:var(--csf-pr)}.csf-de{background:var(--csf-de)}.csf-rs{background:var(--csf-rs)}.csf-rc{background:var(--csf-rc)}
.cta-row{display:flex;gap:10px;margin-top:10px}
.btn{border:1px solid var(--border);background:var(--panel-2);color:var(--text);border-radius:10px;padding:8px 12px;cursor:pointer}
.btn.primary{background:linear-gradient(145deg,#0ea5e9,#22c55e);border:none}
.btn.secondary{background:#0b1220}
.btn.ghost{background:transparent}

.hero-art img{width:100%;border-radius:10px;border:1px solid var(--border);background:#0b1220}

.kpis{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.kpi{display:grid;place-items:center;border:1px dashed var(--border);border-radius:10px;padding:12px;background:#0b1220}
.kpi-num{font-size:28px;font-weight:800}
.kpi-label{color:var(--muted)}

.toolbar{position:sticky;top:58px;z-index:1;display:flex;flex-wrap:wrap;gap:10px;align-items:center;margin-bottom:12px;background:rgba(11,18,32,.8);backdrop-filter:blur(6px);padding:10px;border:1px solid var(--border);border-radius:12px}
.search input{min-width:260px;border:1px solid var(--border);background:#0b1220;color:var(--text);border-radius:10px;padding:10px}
.filters{display:flex;gap:10px;flex-wrap:wrap}
.chk{display:inline-flex;gap:8px;align-items:center;border:1px solid var(--border);padding:6px 8px;border-radius:8px;background:#0b1220}
#sortSelect{border:1px solid var(--border);background:#0b1220;color:var(--text);border-radius:8px;padding:8px}

.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
@media (max-width: 980px){.grid{grid-template-columns:repeat(2,1fr)}.hero{grid-template-columns:1fr}}
@media (max-width: 640px){.grid{grid-template-columns:1fr}}

.card{position:relative;padding:14px;border:1px solid var(--border);border-radius:12px;background:var(--panel-2);min-height:120px;cursor:pointer;transition:transform .08s ease}
.card:hover{box-shadow:0 0 0 2px var(--ring) inset;transform:translateY(-1px)}
.card-head{display:flex;gap:10px;align-items:center}
.num{min-width:34px;height:34px;border-radius:10px;display:grid;place-items:center;font-weight:800;color:#0b1220;background:linear-gradient(145deg,#bae6fd,#7dd3fc);border:1px solid rgba(56,189,248,.8);box-shadow:0 6px 18px rgba(56,189,248,.25)}
.title{font-weight:700}
.desc{color:var(--muted);margin:8px 0 0}
.tags{display:flex;gap:6px;margin-top:10px}
.tag{font-size:12px;border:1px solid var(--border);background:#0b1220;border-radius:999px;padding:4px 8px;color:var(--muted)}

/* Bookmark star */
.star{position:absolute;right:10px;top:10px;border:none;background:transparent;color:#94a3b8;font-size:18px;cursor:pointer}
.star.active{color:#facc15}

.dialog[hidden]{display:none}
.dialog{position:fixed;inset:0;background:rgba(6,8,14,.7);display:grid;place-items:center;padding:20px}
.dialog-content{max-width:900px;width:100%;background:var(--panel);border:1px solid var(--border);border-radius:14px;box-shadow:0 10px 40px rgba(0,0,0,.5);padding:16px}
.dialog-close{position:absolute;right:28px;top:28px;border:none;background:transparent;color:var(--text);font-size:20px;cursor:pointer}
.dlg-head{display:flex;gap:12px;align-items:center}
.dlg-num{width:40px;height:40px;border-radius:10px;display:grid;place-items:center;color:#0b1220;font-weight:800;background:linear-gradient(145deg,#bae6fd,#7dd3fc);border:1px solid rgba(56,189,248,.8)}
.dlg-desc{color:var(--muted)}
.dlg-sections{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:12px}
.dlg-sections h4{margin:0 0 6px}
.dlg-sections ul{margin:0;padding-left:18px}
.dlg-footer{display:flex;justify-content:flex-end;margin-top:12px}

.study .study-header{display:flex;justify-content:space-between;align-items:center}
.study-content{display:grid;grid-template-columns:1.2fr .8fr;gap:16px;margin-top:12px}
.flashcard{position:relative;height:260px;border:1px dashed var(--border);border-radius:12px;background:var(--panel-2);padding:16px;cursor:pointer;perspective:800px}
.flash-front,.flash-back{position:absolute;inset:0;padding:16px;border-radius:12px;backface-visibility:hidden;transition:transform .6s}
.flash-back{transform:rotateY(180deg)}
.flashcard.flipped .flash-front{transform:rotateY(180deg)}
.flashcard.flipped .flash-back{transform:rotateY(360deg)}
.checklist{border:1px dashed var(--border);border-radius:12px;background:var(--panel-2);padding:12px}
.checklist ul{list-style:none;margin:0;padding:0}
.checklist li{display:flex;gap:10px;align-items:flex-start;padding:8px 6px;border-bottom:1px solid rgba(255,255,255,.04)}
.checklist input{margin-top:3px}
.muted{color:var(--muted)}

.res-list{display:grid;gap:10px}
.res-list a{color:#a5f3fc}
.pdf-embed{margin-top:12px;border:1px solid var(--border);border-radius:10px;overflow:hidden}
.loader{display:flex;gap:10px;align-items:center;margin-top:8px}
.loader input[type="file"]{border:1px solid var(--border);background:#0b1220;color:var(--text);border-radius:8px;padding:6px}

/* Insights */
.insights h3{margin:0 0 8px}
.insights-list{margin:0;padding-left:18px;color:var(--text)}
.insights-list li{margin:4px 0}

/* Quiz */
.quiz{margin-top:16px;border:1px solid var(--border);border-radius:12px;background:var(--panel-2);padding:12px}
.quiz .scenario{margin-bottom:10px}
.scenario-text{margin:8px 0}
.hidden{display:none}
.qs{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
@media (max-width: 980px){.qs{grid-template-columns:1fr}}
.q{border:1px dashed var(--border);border-radius:10px;padding:10px}
.q-title{font-weight:700;margin-bottom:8px}
.chips{display:flex;gap:8px;flex-wrap:wrap}
.chip{border:1px solid var(--chip-border);background:var(--chip-bg);color:var(--chip-text);border-radius:999px;padding:6px 12px;cursor:pointer;line-height:1}
.chip:hover{box-shadow:0 0 0 2px var(--ring) inset}
.chip:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.chip.active{background:linear-gradient(145deg,#0ea5e9,#22c55e);color:var(--chip-active-text);border:none}
.chip[data-value="ID"]{ background:var(--csf-id-bg); border-color:var(--csf-id-border); }
.chip[data-value="ID"].active{ background:var(--csf-id); color:var(--chip-active-text); border:none }
.chip[data-value="PR"]{ background:var(--csf-pr-bg); border-color:var(--csf-pr-border); }
.chip[data-value="PR"].active{ background:var(--csf-pr); color:var(--chip-active-text); border:none }
.chip[data-value="DE"]{ background:var(--csf-de-bg); border-color:var(--csf-de-border); }
.chip[data-value="DE"].active{ background:var(--csf-de); color:var(--chip-active-text); border:none }
.chip[data-value="RS"]{ background:var(--csf-rs-bg); border-color:var(--csf-rs-border); }
.chip[data-value="RS"].active{ background:var(--csf-rs); color:var(--chip-active-text); border:none }
.chip[data-value="RC"]{ background:var(--csf-rc-bg); border-color:var(--csf-rc-border); }
.chip[data-value="RC"].active{ background:var(--csf-rc); color:var(--chip-active-text); border:none }
.choices{display:grid;gap:6px}
.choice{display:flex;gap:8px;align-items:center;border:1px solid var(--choice-border);background:var(--choice-bg);color:var(--choice-text);border-radius:8px;padding:8px}
.choice.correct{outline:2px solid #22c55e}
.choice.incorrect{outline:2px solid #ef4444}
.quiz-actions{display:flex;gap:10px;align-items:center;margin-top:10px}
.quiz-settings{display:flex;gap:12px;align-items:center;margin:10px 0}
.quiz-settings select{border:1px solid var(--border);background:#0b1220;color:var(--text);border-radius:8px;padding:6px}

/* Light theme (explicit toggle) */
:root.light{
  --bg:#f3f4f6; --panel:#ffffff; --panel-2:#f8fafc; --text:#0f172a; --muted:#475569; --border:#e5e7eb;
  --chip-bg:#eef2ff; --chip-text:#0f172a; --chip-border:#cbd5e1; --chip-active-text:#0b1220;
  --choice-bg:#ffffff; --choice-text:#0f172a; --choice-border:#e2e8f0;
  /* NIST CSF light tints */
  --csf-id:#0ea5e9; --csf-id-bg:#e0f2fe; --csf-id-border:#7dd3fc;
  --csf-pr:#d97706; --csf-pr-bg:#ffedd5; --csf-pr-border:#fbbf24;
  --csf-de:#7c3aed; --csf-de-bg:#ede9fe; --csf-de-border:#c4b5fd;
  --csf-rs:#dc2626; --csf-rs-bg:#fee2e2; --csf-rs-border:#fca5a5;
  --csf-rc:#16a34a; --csf-rc-bg:#dcfce7; --csf-rc-border:#86efac;
}
.light body{background:var(--bg)}