/* ============================================================
   QSE Study Hub — Design System
   Modern Learning Platform · Clean · White · Navy/Blue
   ============================================================ */

:root{
  --primary:#1d4ed8;
  --primary-600:#1e40af;
  --primary-soft:#eaf1fd;
  --primary-soft-2:#d8e6fb;
  --navy:#12335f;
  --navy-2:#0e2949;
  --bg:#ffffff;
  --bg-soft:#f6f9fd;
  --bg-soft-2:#eef4fb;
  --panel:#ffffff;
  --ink:#1c2b3a;
  --ink-2:#33465e;
  --muted:#5a6b80;
  --line:#dee7f2;
  --line-2:#cbd9ea;
  --green:#15803d;
  --green-soft:#e9f7ef;
  --red:#b91c1c;
  --red-soft:#fdecec;
  --amber:#b45309;
  --amber-soft:#fdf3e4;
  --violet:#6d28d9;
  --violet-soft:#f1eafd;
  --shadow-sm:0 1px 3px rgba(16,42,74,.07);
  --shadow:0 8px 28px rgba(16,42,74,.08);
  --radius:14px;
  --radius-sm:9px;
  --sidebar-w:252px;
  --content-w:860px;
  --font:-apple-system,BlinkMacSystemFont,"Segoe UI","Leelawadee UI","Noto Sans Thai UI","Noto Sans Thai",Tahoma,sans-serif;
  --mono:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,monospace;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:24px}
body{
  margin:0;background:var(--bg);color:var(--ink);
  font-family:var(--font);font-size:16px;line-height:1.78;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
}
img,svg{vertical-align:middle}
a{color:var(--primary);text-decoration:none}
a:hover{text-decoration:underline}
p{margin:.65em 0}
h1,h2,h3,h4{line-height:1.35;color:var(--navy);font-weight:800}
ul,ol{padding-left:1.5rem}
li{margin:.32em 0}
small{color:var(--muted)}
button{font-family:inherit}

/* ---------- App shell ---------- */
.layout{display:flex;min-height:100vh}
.main-col{flex:1;min-width:0;display:flex;flex-direction:column}

/* ---------- Sidebar ---------- */
.sidebar{
  width:var(--sidebar-w);flex-shrink:0;position:sticky;top:0;
  height:100vh;overflow-y:auto;background:var(--navy-2);color:#cfe0f5;
  padding:18px 14px;display:flex;flex-direction:column;gap:4px;
}
.sidebar .brand{display:flex;align-items:center;gap:10px;padding:6px 10px 14px;color:#fff}
.sidebar .brand .logo{
  width:36px;height:36px;border-radius:10px;background:var(--primary);
  display:grid;place-items:center;color:#fff;flex-shrink:0;
}
.sidebar .brand b{font-size:1.02rem;line-height:1.2;display:block}
.sidebar .brand small{display:block;color:#8fb0d8;font-size:.72rem;font-weight:600;letter-spacing:.06em;text-transform:uppercase}
.sidebar .nav-label{font-size:.7rem;font-weight:800;letter-spacing:.12em;text-transform:uppercase;color:#7e9cc4;padding:12px 12px 4px}
.sidebar a.nav-item{
  display:flex;align-items:center;gap:10px;padding:9px 12px;border-radius:10px;
  color:#cfe0f5;font-size:.92rem;font-weight:600;text-decoration:none;
}
.sidebar a.nav-item:hover{background:rgba(255,255,255,.08);color:#fff}
.sidebar a.nav-item.active{background:var(--primary);color:#fff}
.sidebar a.nav-item .nav-ico{width:18px;height:18px;flex-shrink:0;opacity:.9}
.sidebar .divider{height:1px;background:rgba(255,255,255,.12);margin:10px 6px}
.sidebar .lesson-list{display:flex;flex-direction:column;gap:2px}
.sidebar a.lesson-link{
  display:flex;align-items:center;gap:8px;padding:7px 12px;border-radius:9px;
  color:#b9cfe9;font-size:.85rem;text-decoration:none;font-weight:600;
}
.sidebar a.lesson-link:hover{background:rgba(255,255,255,.07);color:#fff}
.sidebar a.lesson-link.current{background:rgba(29,78,216,.35);color:#fff}
.sidebar .status-dot{width:8px;height:8px;border-radius:50%;background:#57708f;flex-shrink:0}
.sidebar .status-dot.in-progress{background:#f5b942}
.sidebar .status-dot.completed{background:#3ecf7a}
.sidebar .sidebar-foot{margin-top:auto;padding:12px;color:#7e9cc4;font-size:.75rem}

/* Sidebar toggle (mobile) */
.sidebar-toggle{
  display:none;position:fixed;z-index:60;left:14px;top:14px;
  width:42px;height:42px;border-radius:12px;border:1px solid var(--line);
  background:#fff;color:var(--navy);cursor:pointer;align-items:center;justify-content:center;
  box-shadow:var(--shadow-sm);
}
.sidebar-backdrop{display:none}

/* ---------- Reading progress bar ---------- */
.reading-progress{
  position:fixed;top:0;left:0;right:0;height:3px;z-index:70;background:transparent;pointer-events:none;
}
.reading-progress span{display:block;height:100%;width:0;background:var(--primary);transition:width .08s linear}

/* ---------- Topbar (lesson pages) ---------- */
.lesson-topbar{
  position:sticky;top:0;z-index:50;background:rgba(255,255,255,.92);
  backdrop-filter:blur(8px);border-bottom:1px solid var(--line);
  padding:10px 20px;display:flex;align-items:center;gap:14px;flex-wrap:wrap;
}
.breadcrumb{display:flex;align-items:center;gap:6px;font-size:.86rem;color:var(--muted);flex-wrap:wrap;min-width:0}
.breadcrumb a{color:var(--primary);font-weight:600}
.breadcrumb .sep{color:var(--line-2)}
.breadcrumb .current{color:var(--ink-2);font-weight:700;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;max-width:34vw}
.topbar-actions{margin-left:auto;display:flex;align-items:center;gap:8px}

/* Search in lesson */
.lesson-search{position:relative}
.lesson-search input{
  width:230px;max-width:44vw;padding:8px 12px 8px 34px;border-radius:10px;
  border:1px solid var(--line);background:var(--bg-soft);font-size:.88rem;color:var(--ink);
  font-family:inherit;
}
.lesson-search input:focus{outline:2px solid var(--primary-soft-2);border-color:var(--primary);background:#fff}
.lesson-search .search-ico{position:absolute;left:10px;top:50%;transform:translateY(-50%);color:var(--muted);width:15px;height:15px}
.search-results{
  position:absolute;top:calc(100% + 6px);right:0;width:340px;max-width:80vw;max-height:340px;overflow:auto;
  background:#fff;border:1px solid var(--line);border-radius:12px;box-shadow:var(--shadow);z-index:80;padding:6px;
}
.search-results .sr-item{display:block;padding:9px 11px;border-radius:9px;text-decoration:none;color:var(--ink)}
.search-results .sr-item:hover{background:var(--primary-soft)}
.search-results .sr-item b{display:block;font-size:.86rem;color:var(--navy)}
.search-results .sr-item small{display:block;font-size:.78rem;color:var(--muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.search-results .sr-empty{padding:12px;color:var(--muted);font-size:.86rem;text-align:center}
mark.hl{background:#ffe9a8;color:inherit;border-radius:3px;padding:0 2px}

/* ---------- Hero header ---------- */
.home-header{
  background:linear-gradient(160deg,#f7fbff 0%,#e9f2fd 70%,#e3edfc 100%);
  border-bottom:1px solid var(--line);padding:44px 28px 34px;
}
.home-header .inner{max-width:1120px;margin:0 auto}
.eyebrow{color:var(--primary);font-weight:800;letter-spacing:.1em;font-size:.78rem;text-transform:uppercase}
.home-header h1{font-size:clamp(1.9rem,4vw,2.7rem);margin:.3rem 0;color:var(--navy-2)}
.home-header .lead{color:var(--muted);max-width:720px;font-size:1.04rem;margin:.2rem 0 0}
.header-row{display:flex;gap:16px;align-items:center;flex-wrap:wrap;margin-top:20px}
.global-search{position:relative;flex:1;min-width:240px;max-width:460px}
.global-search input{
  width:100%;padding:11px 14px 11px 38px;border-radius:12px;border:1px solid var(--line-2);
  font-size:.95rem;background:#fff;box-shadow:var(--shadow-sm);font-family:inherit;color:var(--ink);
}
.global-search input:focus{outline:2px solid var(--primary-soft-2);border-color:var(--primary)}
.global-search .search-ico{position:absolute;left:12px;top:50%;transform:translateY(-50%);color:var(--muted);width:16px;height:16px}
.stat-chips{display:flex;gap:10px;flex-wrap:wrap}
.stat-chip{
  background:#fff;border:1px solid var(--line);border-radius:12px;padding:8px 14px;
  box-shadow:var(--shadow-sm);display:flex;flex-direction:column;min-width:86px;
}
.stat-chip b{font-size:1.15rem;color:var(--navy);line-height:1.2}
.stat-chip span{font-size:.74rem;color:var(--muted);font-weight:600}

/* ---------- Home layout ---------- */
.home-main{max-width:1120px;margin:0 auto;padding:26px 28px 70px;width:100%}
.view-head{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin:6px 0 16px}
.view-head h2{font-size:1.4rem;margin:0}
.view-head .count-pill{background:var(--primary-soft);color:var(--primary-600);font-weight:700;font-size:.8rem;border-radius:99px;padding:3px 11px}
.view-desc{color:var(--muted);font-size:.92rem;margin:0 0 18px}
.toolbar{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:18px;align-items:center}
.toolbar .filter-chips{display:flex;gap:7px;flex-wrap:wrap}
.chip{
  border:1px solid var(--line);background:#fff;color:var(--ink-2);border-radius:99px;
  padding:6px 13px;font-size:.84rem;font-weight:650;cursor:pointer;font-family:inherit;
}
.chip:hover{border-color:var(--primary);color:var(--primary)}
.chip.active{background:var(--primary);border-color:var(--primary);color:#fff}
.toolbar select{
  padding:7px 11px;border-radius:10px;border:1px solid var(--line);background:#fff;
  font-size:.86rem;font-family:inherit;color:var(--ink-2);font-weight:600;cursor:pointer;
}
.toolbar .result-info{color:var(--muted);font-size:.85rem;margin-left:auto}

/* ---------- Lesson cards ---------- */
.card-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:16px}
.lesson-card{
  background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);
  padding:18px 18px 16px;box-shadow:var(--shadow-sm);display:flex;flex-direction:column;gap:10px;
  position:relative;transition:box-shadow .15s ease,transform .15s ease;
}
.lesson-card:hover{box-shadow:var(--shadow);transform:translateY(-2px)}
.lesson-card .card-top{display:flex;align-items:flex-start;gap:10px}
.lesson-card .card-ico{
  width:42px;height:42px;border-radius:12px;background:var(--primary-soft);color:var(--primary);
  display:grid;place-items:center;flex-shrink:0;
}
.lesson-card h3{margin:2px 0 0;font-size:1.03rem;line-height:1.4}
.lesson-card h3 a{color:var(--navy)}
.lesson-card h3 a:hover{color:var(--primary);text-decoration:none}
.lesson-card .card-desc{color:var(--muted);font-size:.86rem;margin:0;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
.lesson-card .card-tags{display:flex;gap:6px;flex-wrap:wrap}
.tag{background:var(--bg-soft-2);color:var(--ink-2);border-radius:7px;padding:2px 8px;font-size:.74rem;font-weight:650}
.lesson-card .card-meta{display:flex;gap:12px;flex-wrap:wrap;color:var(--muted);font-size:.78rem;font-weight:600}
.lesson-card .card-foot{display:flex;align-items:center;gap:8px;margin-top:auto;padding-top:6px}
.card-status{font-size:.76rem;font-weight:750;border-radius:99px;padding:3px 10px}
.card-status.not-started{background:var(--bg-soft-2);color:var(--muted)}
.card-status.in-progress{background:#fdf3e0;color:#92610a}
.card-status.completed{background:var(--green-soft);color:var(--green)}
.card-quiz-score{font-size:.76rem;font-weight:700;color:var(--primary-600);background:var(--primary-soft);border-radius:99px;padding:3px 10px}

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:7px;
  border:1px solid transparent;border-radius:11px;padding:9px 16px;
  font-size:.9rem;font-weight:750;cursor:pointer;text-decoration:none;font-family:inherit;
  transition:filter .12s ease,background .12s ease;
}
.btn:hover{text-decoration:none}
.btn.primary{background:var(--primary);color:#fff}
.btn.primary:hover{background:var(--primary-600)}
.btn.secondary{background:var(--primary-soft);color:var(--primary-600);border-color:var(--primary-soft-2)}
.btn.secondary:hover{background:var(--primary-soft-2)}
.btn.ghost{background:#fff;color:var(--ink-2);border-color:var(--line)}
.btn.ghost:hover{border-color:var(--line-2);background:var(--bg-soft)}
.btn.danger{background:var(--red-soft);color:var(--red);border-color:#f3caca}
.btn.danger:hover{background:#fbdcdc}
.btn.small{padding:6px 12px;font-size:.82rem;border-radius:9px}
.btn:disabled{opacity:.55;cursor:not-allowed}
.icon-btn{
  width:38px;height:38px;border-radius:11px;border:1px solid var(--line);background:#fff;
  color:var(--ink-2);cursor:pointer;display:grid;place-items:center;flex-shrink:0;
}
.icon-btn:hover{background:var(--bg-soft);border-color:var(--line-2)}
.icon-btn.active{background:#fff4d6;border-color:#f0d48a;color:#92610a}
.bm-btn{padding:6px 9px}
.bm-btn svg{width:16px;height:16px}
.bm-btn.active{background:#fff4d6;border-color:#f0d48a;color:#92610a}
.quiz-error{background:var(--red-soft);border:1px solid #f3caca;color:var(--red);border-radius:12px;padding:14px 16px;font-size:.88rem;font-weight:650}
.category-badge.completed-badge{background:var(--green-soft);color:var(--green)}

/* ---------- Panels & misc home components ---------- */
.panel{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow-sm);padding:20px 22px;margin-bottom:18px}
.panel h3{margin:0 0 10px;font-size:1.05rem}
.progress-block{display:flex;align-items:center;gap:14px;flex-wrap:wrap}
.progress-ring{position:relative;width:86px;height:86px;flex-shrink:0}
.progress-ring svg{transform:rotate(-90deg)}
.progress-ring .ring-val{position:absolute;inset:0;display:grid;place-items:center;font-weight:800;color:var(--navy);font-size:1.05rem}
.progress-bar{height:9px;background:var(--bg-soft-2);border-radius:99px;overflow:hidden;flex:1;min-width:160px}
.progress-bar span{display:block;height:100%;background:var(--primary);border-radius:99px;transition:width .3s ease}
.progress-bar span.green{background:var(--green)}
.progress-meta{color:var(--muted);font-size:.85rem}
.list-rows{display:flex;flex-direction:column}
.list-row{display:flex;align-items:center;gap:12px;padding:11px 4px;border-bottom:1px solid var(--line)}
.list-row:last-child{border-bottom:0}
.list-row .row-ico{width:34px;height:34px;border-radius:10px;background:var(--primary-soft);color:var(--primary);display:grid;place-items:center;flex-shrink:0}
.list-row .row-main{flex:1;min-width:0}
.list-row .row-main b{display:block;font-size:.92rem;color:var(--navy)}
.list-row .row-main small{color:var(--muted);font-size:.78rem}
.list-row .row-side{display:flex;align-items:center;gap:8px;flex-shrink:0}
.empty-state{
  text-align:center;color:var(--muted);padding:44px 20px;border:1.5px dashed var(--line-2);
  border-radius:var(--radius);background:var(--bg-soft);
}
.empty-state .es-ico{width:46px;height:46px;margin:0 auto 10px;color:var(--line-2)}
.category-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(min(310px,100%),1fr));gap:16px}
.category-card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:18px;box-shadow:var(--shadow-sm)}
.category-card .cat-head{display:flex;align-items:center;gap:11px;margin-bottom:8px}
.category-card .cat-ico{width:40px;height:40px;border-radius:11px;background:var(--primary-soft);color:var(--primary);display:grid;place-items:center}
.category-card h3{margin:0;font-size:1rem}
.category-card .cat-count{color:var(--muted);font-size:.8rem;font-weight:650}
.category-card ul{list-style:none;margin:10px 0 0;padding:0;display:flex;flex-direction:column;gap:6px}
.category-card ul a{display:flex;align-items:center;gap:8px;font-size:.88rem;font-weight:650;color:var(--ink-2);padding:7px 10px;border-radius:9px}
.category-card ul a:hover{background:var(--primary-soft);color:var(--primary);text-decoration:none}
.quiz-row{display:flex;align-items:center;gap:12px;padding:13px 4px;border-bottom:1px solid var(--line);flex-wrap:wrap}
.quiz-row:last-child{border-bottom:0}
.quiz-row .qr-main{flex:1;min-width:200px}
.quiz-row .qr-main b{color:var(--navy);font-size:.95rem}
.quiz-row .qr-main small{display:block;color:var(--muted)}
.quiz-row .qr-stats{display:flex;gap:8px;flex-wrap:wrap;align-items:center}
.mini-stat{background:var(--bg-soft);border-radius:9px;padding:4px 10px;font-size:.78rem;font-weight:700;color:var(--ink-2);white-space:nowrap}
.mini-stat b{color:var(--navy)}
.notice{background:var(--amber-soft);border:1px solid #f2ddb4;border-radius:11px;padding:10px 14px;color:#7c5306;font-size:.86rem;font-weight:600}

/* ---------- Lesson page ---------- */
.lesson-hero{padding:34px 28px 26px;border-bottom:1px solid var(--line);background:linear-gradient(170deg,#f8fbff,#eef4fc)}
.lesson-hero .inner{max-width:calc(var(--content-w) + 260px);margin:0 auto}
.lesson-hero h1{font-size:clamp(1.55rem,3.4vw,2.3rem);margin:.4rem 0 .3rem}
.lesson-hero .lesson-desc{color:var(--muted);max-width:760px;font-size:1rem;margin:.1rem 0 12px}
.lesson-meta{display:flex;gap:9px;flex-wrap:wrap;align-items:center;color:var(--muted);font-size:.82rem;font-weight:650}
.lesson-actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:16px}
.lesson-body{
  max-width:calc(var(--content-w) + 260px);margin:0 auto;padding:26px 28px 60px;width:100%;
  display:grid;grid-template-columns:minmax(0,1fr) 216px;gap:30px;align-items:start;
}
.lesson-content{min-width:0;max-width:var(--content-w)}

/* Category badge */
.category-badge{
  display:inline-flex;align-items:center;gap:6px;background:var(--primary-soft);color:var(--primary-600);
  font-size:.76rem;font-weight:750;border-radius:99px;padding:4px 12px;
}

/* ---------- TOC ---------- */
.toc{position:sticky;top:64px;max-height:calc(100vh - 90px);overflow:auto;font-size:.83rem}
.toc .toc-title{font-weight:800;color:var(--navy);font-size:.78rem;letter-spacing:.08em;text-transform:uppercase;margin-bottom:8px}
.toc a{display:block;color:var(--muted);text-decoration:none;padding:4px 10px;border-left:2px solid var(--line);font-weight:600;border-radius:0 8px 8px 0}
.toc a:hover{color:var(--primary);border-color:var(--primary-soft-2)}
.toc a.active{color:var(--primary);border-color:var(--primary);background:var(--primary-soft)}
.toc .toc-num{color:var(--line-2);font-weight:800;margin-right:5px;font-size:.72rem}
.toc a.active .toc-num{color:var(--primary)}

/* ---------- Lesson sections ---------- */
.lesson-section{margin:0 0 34px;scroll-margin-top:70px}
.section-head{display:flex;gap:13px;align-items:center;border-bottom:1px solid var(--line);padding-bottom:12px;margin-bottom:18px}
.section-head .section-num{
  display:grid;place-items:center;min-width:42px;height:42px;border-radius:12px;
  background:var(--primary-soft);color:var(--primary);font-weight:900;font-size:.95rem;flex-shrink:0;
}
.section-head h2{font-size:1.32rem;margin:0}
.lesson-content h3{font-size:1.1rem;margin:26px 0 8px;color:var(--navy)}
.lesson-content h4{font-size:.98rem;margin:18px 0 6px;color:var(--ink-2)}

/* Source labels */
.src-badges{display:flex;gap:7px;flex-wrap:wrap;margin:0 0 10px}
.badge{display:inline-flex;align-items:center;gap:5px;border-radius:99px;padding:2px 10px;font-size:.72rem;font-weight:750}
.badge-slide{background:var(--primary-soft);color:var(--primary-600)}
.badge-extra{background:var(--violet-soft);color:var(--violet)}
.badge-practice{background:var(--green-soft);color:var(--green)}
.src-note{font-size:.8rem;color:var(--muted);margin:-6px 0 12px}

/* Callouts */
.callout{border-radius:12px;padding:13px 16px;margin:16px 0;border:1px solid transparent}
.callout .co-title{font-weight:800;display:flex;align-items:center;gap:7px;margin-bottom:4px}
.callout.info{background:var(--primary-soft);border-color:var(--primary-soft-2);color:var(--ink-2)}
.callout.info .co-title{color:var(--primary-600)}
.callout.tip{background:var(--green-soft);border-color:#cdeed9;color:var(--ink-2)}
.callout.tip .co-title{color:var(--green)}
.callout.warn{background:var(--amber-soft);border-color:#f2ddb4;color:var(--ink-2)}
.callout.warn .co-title{color:var(--amber)}
.callout.danger{background:var(--red-soft);border-color:#f3caca;color:var(--ink-2)}
.callout.danger .co-title{color:var(--red)}

/* Code blocks */
.code-block{margin:16px 0;border-radius:12px;overflow:hidden;border:1px solid #0d2036;background:#0d2036;position:relative}
.code-caption{
  display:flex;align-items:center;justify-content:space-between;gap:10px;
  background:#132c49;color:#9fc0e4;font-size:.74rem;font-weight:700;
  padding:7px 13px;font-family:var(--mono);letter-spacing:.04em;
}
.code-block pre{margin:0;padding:15px 17px;overflow-x:auto;color:#e8f2ff;line-height:1.62;font-size:.86rem}
.code-block code{font-family:var(--mono);background:none;padding:0;color:inherit;font-size:inherit}
.copy-btn{
  background:rgba(255,255,255,.09);border:1px solid rgba(255,255,255,.18);color:#cfe0f5;
  border-radius:7px;padding:3px 10px;font-size:.72rem;font-weight:700;cursor:pointer;font-family:inherit;
}
.copy-btn:hover{background:rgba(255,255,255,.18)}
.copy-btn.copied{background:#1d7a45;border-color:#1d7a45;color:#fff}
code.inline, p code, li code, td code, h3 code, h4 code, .callout code, .mini code{
  font-family:var(--mono);background:var(--bg-soft-2);color:#0e4777;
  padding:2px 6px;border-radius:6px;font-size:.86em;overflow-wrap:anywhere;
}
pre>code{overflow-wrap:normal}

/* Terminal-style output */
.term-block{margin:14px 0;border-radius:12px;overflow:hidden;border:1px solid #0d2036}
.term-block .term-caption{background:#132c49;color:#9fc0e4;font-size:.74rem;font-weight:700;padding:7px 13px;font-family:var(--mono)}
.term-block pre{margin:0;background:#0d2036;color:#d7e7fb;padding:14px 17px;overflow-x:auto;line-height:1.7;font-size:.85rem}
.term-block .t-prompt{color:#7ee2a8;font-weight:700}
.term-block .t-cmd{color:#fff;font-weight:600}
.term-block .t-out{color:#a9c3e4}
.term-block .t-err{color:#ff9d9d}

/* Tables */
.table-wrap{overflow-x:auto;margin:14px 0;border:1px solid var(--line);border-radius:12px}
table{border-collapse:collapse;width:100%;font-size:.88rem;background:#fff}
th,td{text-align:left;vertical-align:top;padding:10px 13px;border-bottom:1px solid var(--line)}
thead th{background:var(--bg-soft-2);color:var(--navy);font-size:.8rem;letter-spacing:.02em;border-bottom:1px solid var(--line-2)}
tbody tr:last-child td{border-bottom:0}
tbody tr:nth-child(even) td{background:#fafcff}

/* Grid minis */
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:12px;margin:14px 0}
.mini{border:1px solid var(--line);border-radius:12px;padding:14px 15px;background:#fcfdff}
.mini h4{margin:0 0 6px;font-size:.92rem;color:var(--navy);display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.mini p{margin:.25rem 0;color:var(--muted);font-size:.86rem}
.mini .pill{display:inline-block;border-radius:99px;background:var(--green-soft);color:var(--green);padding:2px 9px;font-size:.72rem;font-weight:750}
.pill.blue{background:var(--primary-soft);color:var(--primary-600)}
.pill.red{background:var(--red-soft);color:var(--red)}
.pill.amber{background:var(--amber-soft);color:var(--amber)}

/* Practice */
.practice-item{border:1px solid var(--line);border-radius:12px;padding:14px 16px;margin:10px 0;background:#fcfdff}
.practice-item .practice-q{font-weight:700;color:var(--ink-2);margin:0 0 8px}
.practice-item details summary{
  cursor:pointer;font-weight:750;color:var(--primary-600);font-size:.86rem;
  background:var(--primary-soft);border-radius:8px;padding:6px 12px;display:inline-block;list-style:none;
}
.practice-item details summary::-webkit-details-marker{display:none}
.practice-item details summary::before{content:"💡 ";}
.practice-item details[open] summary{border-radius:8px 8px 0 0}
.practice-item details .practice-a{
  background:var(--bg-soft);border:1px solid var(--line);border-top:0;border-radius:0 0 10px 10px;
  padding:11px 14px;font-size:.9rem;margin-top:6px;
}
.practice-item details .practice-a p:first-child{margin-top:0}
.practice-item details .practice-a p:last-child{margin-bottom:0}

/* Key terms */
.kt-list{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:10px;margin:12px 0}
.kt{border:1px solid var(--line);border-radius:11px;padding:11px 13px;background:#fff}
.kt b{display:block;color:var(--navy);font-size:.88rem}
.kt span{color:var(--muted);font-size:.8rem}

/* ---------- Quiz ---------- */
.quiz-panel{border:1px solid var(--line);border-radius:var(--radius);background:#fff;box-shadow:var(--shadow-sm);overflow:hidden}
.quiz-head{padding:16px 20px;background:var(--bg-soft);border-bottom:1px solid var(--line);display:flex;gap:12px;align-items:center;flex-wrap:wrap}
.quiz-head .qh-main{flex:1;min-width:200px}
.quiz-head .qh-main b{color:var(--navy)}
.quiz-head .qh-main small{display:block;color:var(--muted);font-weight:600}
.quiz-meta-chips{display:flex;gap:6px;flex-wrap:wrap}
.diff-badge{font-size:.68rem;font-weight:800;border-radius:6px;padding:1px 7px}
.diff-easy{background:var(--green-soft);color:var(--green)}
.diff-medium{background:var(--amber-soft);color:var(--amber)}
.diff-hard{background:var(--red-soft);color:var(--red)}
.quiz-toolbar{display:flex;align-items:center;gap:12px;flex-wrap:wrap;padding:12px 20px;border-bottom:1px solid var(--line);background:#fff}
.quiz-toolbar label{display:flex;align-items:center;gap:7px;font-size:.84rem;font-weight:650;color:var(--ink-2);cursor:pointer}
.quiz-toolbar input[type=checkbox]{accent-color:var(--primary);width:16px;height:16px}
.quiz-toolbar .qt-progress{margin-left:auto;display:flex;align-items:center;gap:9px;font-size:.82rem;font-weight:700;color:var(--muted)}
.quiz-toolbar .qt-progress .progress-bar{width:110px;min-width:110px}
.quiz-form{padding:6px 20px 14px}
.quiz-item{padding:16px 0 14px;border-bottom:1px solid var(--line)}
.quiz-item:last-child{border-bottom:0}
.q-title{font-weight:750;font-size:.97rem;margin:0 0 10px;color:var(--ink);display:flex;gap:8px;align-items:baseline;flex-wrap:wrap}
.q-title .q-num{color:var(--primary);font-weight:900}
.option{
  display:flex;gap:10px;align-items:flex-start;padding:9px 13px;margin:6px 0;
  border:1px solid var(--line);border-radius:10px;cursor:pointer;font-size:.9rem;
}
.option:hover{background:#f6faff;border-color:var(--line-2)}
.option input{margin-top:5px;accent-color:var(--primary);flex-shrink:0}
.option .opt-letter{font-weight:800;color:var(--primary-600);flex-shrink:0}
.option.correct{background:var(--green-soft);border-color:#8fd3a8}
.option.correct .opt-letter{color:var(--green)}
.option.wrong{background:var(--red-soft);border-color:#eda9a9}
.option.wrong .opt-letter{color:var(--red)}
.quiz-item.graded .option{cursor:default}
.feedback{
  margin-top:9px;padding:10px 13px;border-radius:9px;background:var(--bg-soft);
  font-size:.86rem;display:none;border:1px solid var(--line);
}
.feedback.show{display:block}
.feedback.correct{background:var(--green-soft);border-color:#cdeed9;color:#14532d;font-weight:650}
.feedback.wrong{background:var(--red-soft);border-color:#f3caca;color:#7f1d1d;font-weight:650}
.quiz-actions{display:flex;gap:10px;align-items:center;flex-wrap:wrap;padding:16px 20px;border-top:1px solid var(--line);background:var(--bg-soft)}
.quiz-score{font-weight:800;color:var(--navy);font-size:1.02rem}
.quiz-score .qs-sub{display:block;font-size:.8rem;color:var(--muted);font-weight:650}
.quiz-history{padding:10px 20px 14px;font-size:.82rem;color:var(--muted);font-weight:650;border-top:1px solid var(--line)}
.quiz-history b{color:var(--navy)}
.answer-reveal{border:1px solid var(--line);border-radius:12px;background:#fcfdff;padding:4px 14px;margin:12px 0}
.answer-reveal summary{cursor:pointer;font-weight:800;color:var(--primary-600);padding:10px 0}
.answer-reveal summary::-webkit-details-marker{display:none}
.answer-reveal summary::before{content:"🔑 "}
.answer-list{margin:0;padding-left:1.4rem}
.answer-list li{margin:.6em 0;font-size:.9rem}
.answer-list li small{display:block;color:var(--muted);font-size:.8rem;line-height:1.6}

/* ---------- Lesson footer / prev-next ---------- */
.lesson-footer{border-top:1px solid var(--line);background:var(--bg-soft);padding:22px 28px 30px}
.lesson-footer .inner{max-width:calc(var(--content-w) + 260px);margin:0 auto;display:flex;gap:12px;flex-wrap:wrap;align-items:stretch}
.pn-card{
  flex:1;min-width:220px;border:1px solid var(--line);border-radius:12px;background:#fff;
  padding:13px 16px;display:flex;flex-direction:column;gap:3px;text-decoration:none;box-shadow:var(--shadow-sm);
}
.pn-card:hover{border-color:var(--primary);text-decoration:none}
.pn-card small{color:var(--muted);font-weight:700;font-size:.74rem;text-transform:uppercase;letter-spacing:.06em}
.pn-card b{color:var(--navy);font-size:.95rem}
.pn-card.next{text-align:right;align-items:flex-end}
.pn-card.disabled{opacity:.45;pointer-events:none}
.back-dashboard{display:flex;justify-content:center;margin-top:14px}

/* ---------- Back to top ---------- */
.back-to-top{
  position:fixed;right:20px;bottom:20px;width:44px;height:44px;border-radius:13px;
  background:var(--primary);color:#fff;border:0;cursor:pointer;z-index:65;
  box-shadow:var(--shadow);display:none;align-items:center;justify-content:center;
}
.back-to-top.show{display:flex}
.back-to-top:hover{background:var(--primary-600)}

/* ---------- Footer ---------- */
.site-footer{border-top:1px solid var(--line);padding:20px 28px;color:var(--muted);font-size:.82rem;text-align:center;background:var(--bg-soft)}

/* ---------- Confirm inline ---------- */
.confirm-inline{display:flex;gap:8px;align-items:center;flex-wrap:wrap;font-size:.85rem;color:var(--red);font-weight:700}

/* ---------- Responsive ---------- */
@media (max-width:1180px){
  .lesson-body{grid-template-columns:minmax(0,1fr)}
  .toc{position:static;max-height:none;display:flex;gap:6px;overflow-x:auto;padding-bottom:6px}
  .toc .toc-title{display:none}
  .toc a{border:1px solid var(--line);border-radius:99px;padding:5px 13px;white-space:nowrap;font-size:.8rem}
  .toc a.active{border-color:var(--primary)}
  .toc .toc-num{display:none}
}
@media (max-width:920px){
  .sidebar{
    position:fixed;left:0;top:0;bottom:0;z-index:90;transform:translateX(-105%);
    transition:transform .22s ease;box-shadow:0 0 40px rgba(0,0,0,.25);
  }
  .sidebar.open{transform:translateX(0)}
  .sidebar-toggle{display:flex}
  .sidebar-backdrop{
    display:block;position:fixed;inset:0;background:rgba(10,25,45,.45);z-index:85;
    opacity:0;pointer-events:none;transition:opacity .2s ease;
  }
  .sidebar-backdrop.show{opacity:1;pointer-events:auto}
  .lesson-topbar{padding-left:64px}
  .home-header{padding:38px 18px 28px;padding-left:64px}
  .home-main{padding:20px 16px 60px}
  .lesson-hero{padding:26px 16px 22px}
  .lesson-body{padding:20px 16px 50px}
  .lesson-footer{padding:18px 16px 26px}
  .global-search{max-width:none}
}
@media (max-width:640px){
  .card-grid{grid-template-columns:1fr}
  .lesson-search input{width:150px}
  .search-results{left:0;right:auto;width:300px}
  .stat-chips{width:100%}
  .stat-chip{flex:1;min-width:0}
  .quiz-form,.quiz-actions,.quiz-toolbar,.quiz-head,.quiz-history{padding-left:14px;padding-right:14px}
  .pn-card.next{text-align:left;align-items:flex-start}
}

/* ---------- Print ---------- */
@media print{
  .sidebar,.sidebar-toggle,.sidebar-backdrop,.lesson-topbar,.back-to-top,.reading-progress,
  .quiz-toolbar,.quiz-actions,.copy-btn,.toc,.lesson-actions,.pn-card,.site-footer{display:none!important}
  .lesson-body{display:block;max-width:none;padding:0}
  .lesson-content{max-width:none}
  body{font-size:11.5pt}
  .lesson-section{break-inside:avoid-page}
  .code-block,.term-block{break-inside:avoid}
  .answer-reveal{display:block}
  .answer-reveal ol{display:block!important}
}