:root {
  --teal:       #0d9488;
  --teal-dark:  #0f766e;
  --teal-deep:  #134e4a;
  --teal-light: #99f6e4;
  --teal-pale:  #f0fdfa;
  --teal-mid:   #14b8a6;
  --white:      #ffffff;
  --gray-50:    #f8fafc;
  --gray-100:   #f1f5f9;
  --gray-200:   #e2e8f0;
  --gray-300:   #cbd5e1;
  --gray-400:   #94a3b8;
  --gray-600:   #475569;
  --gray-700:   #334155;
  --gray-800:   #1e293b;
  --gray-900:   #0f172a;
  --red:        #ef4444;
  --green:      #22c55e;
  --yellow:     #f59e0b;
  --font-mono:  'JetBrains Mono', monospace;
  --font-sans:  'DM Sans', sans-serif;
  --nav-width:  240px;
  --topbar-h:   56px;
  --radius:     10px;
  --shadow:     0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.06);
  --shadow-md:  0 4px 6px rgba(0,0,0,.07), 0 2px 4px rgba(0,0,0,.06);
  --shadow-lg:  0 10px 15px rgba(0,0,0,.1), 0 4px 6px rgba(0,0,0,.05);
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--font-sans);background:var(--gray-50);color:var(--gray-800);min-height:100vh;overflow-x:hidden}
a{text-decoration:none;color:inherit}
button{cursor:pointer;font-family:var(--font-sans);border:none;background:none}
input,select,textarea{font-family:var(--font-sans)}
code,pre{font-family:var(--font-mono)}

/* ── TOPBAR ── */
#topbar{position:fixed;top:0;left:0;right:0;height:var(--topbar-h);background:var(--gray-900);border-bottom:1px solid rgba(255,255,255,.06);display:flex;align-items:center;padding:0 16px;gap:12px;z-index:200}
#topbar .logo{display:flex;align-items:center;gap:8px;min-width:var(--nav-width);padding-right:16px}
#topbar .logo .badge{background:var(--teal);color:#fff;font-size:11px;font-weight:700;padding:3px 8px;border-radius:5px;letter-spacing:.5px}
#topbar .logo .name{color:#fff;font-size:15px;font-weight:600}
#topbar .center{flex:1;display:flex;align-items:center;gap:8px}
#search-bar{flex:1;max-width:380px;background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.1);border-radius:8px;padding:7px 12px;color:#fff;font-size:13px;outline:none;transition:.2s}
#search-bar::placeholder{color:rgba(255,255,255,.35)}
#search-bar:focus{border-color:var(--teal);background:rgba(255,255,255,.1)}
#topbar .right{display:flex;align-items:center;gap:10px;margin-left:auto}
.hamburger{display:none;color:#fff;padding:6px;border-radius:6px;background:rgba(255,255,255,.07)}

/* ── SIDEBAR ── */
#sidebar{position:fixed;top:var(--topbar-h);left:0;width:var(--nav-width);height:calc(100vh - var(--topbar-h));background:var(--gray-900);border-right:1px solid rgba(255,255,255,.06);overflow-y:auto;z-index:100;transition:.3s}
#sidebar::-webkit-scrollbar{width:4px}
#sidebar::-webkit-scrollbar-track{background:transparent}
#sidebar::-webkit-scrollbar-thumb{background:rgba(255,255,255,.1);border-radius:2px}
.nav-section{padding:16px 12px 8px;font-size:10px;font-weight:700;color:rgba(255,255,255,.3);letter-spacing:1.2px;text-transform:uppercase}
.nav-item{display:flex;align-items:center;gap:10px;padding:9px 16px;margin:1px 8px;border-radius:8px;color:rgba(255,255,255,.55);font-size:13.5px;font-weight:500;cursor:pointer;transition:.15s;position:relative}
.nav-item:hover{background:rgba(255,255,255,.06);color:rgba(255,255,255,.85)}
.nav-item.active{background:rgba(13,148,136,.2);color:var(--teal-light);border:1px solid rgba(13,148,136,.3)}
.nav-item .icon{width:16px;height:16px;opacity:.8;flex-shrink:0}
.nav-item .badge-count{margin-left:auto;background:var(--teal);color:#fff;font-size:10px;font-weight:700;padding:1px 6px;border-radius:10px;min-width:18px;text-align:center}
.nav-item .badge-new{margin-left:auto;background:var(--red);color:#fff;font-size:9px;font-weight:700;padding:1px 5px;border-radius:4px}

/* ── MAIN ── */
#main{margin-left:var(--nav-width);margin-top:var(--topbar-h);min-height:calc(100vh - var(--topbar-h));padding:28px 32px}
.page{display:none}
.page.active{display:block}

/* ── CARDS ── */
.card{background:var(--white);border-radius:var(--radius);border:1px solid var(--gray-200);box-shadow:var(--shadow);padding:20px}
.card-grid{display:grid;gap:16px}
.card-grid-2{grid-template-columns:repeat(2,1fr)}
.card-grid-3{grid-template-columns:repeat(3,1fr)}
.card-grid-4{grid-template-columns:repeat(4,1fr)}

/* ── DASHBOARD ── */
.dash-hero{background:linear-gradient(135deg,var(--gray-900) 0%,#0d2137 60%,#0a2a1f 100%);border-radius:14px;padding:40px;margin-bottom:32px;position:relative;overflow:hidden;display:flex;justify-content:space-between;align-items:center;gap:32px;flex-wrap:wrap;border:1px solid rgba(255,255,255,.06)}
.dash-hero::before{content:'';position:absolute;top:-40px;right:-40px;width:220px;height:220px;background:rgba(255,255,255,.04);border-radius:50%}
.dash-hero::after{content:'';position:absolute;bottom:-60px;right:60px;width:160px;height:160px;background:rgba(255,255,255,.03);border-radius:50%}
.dash-hero-content{position:relative;max-width:600px;z-index:2}
.dash-hero h1{color:#fff;font-size:32px;font-weight:800;margin-bottom:12px;letter-spacing:-0.5px}
.dash-hero p{color:rgba(255,255,255,.6);font-size:15px;line-height:1.6;margin-bottom:24px}
.hero-actions{display:flex;gap:12px;margin-bottom:32px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;gap:8px;padding:10px 20px;border-radius:8px;font-size:14px;font-weight:600;cursor:pointer;transition:0.2s;font-family:var(--font-sans)}
.btn-primary{background:var(--teal);color:#fff;border:1px solid var(--teal)}
.btn-primary:hover{background:var(--teal-dark);border-color:var(--teal-dark)}
.btn-secondary{background:rgba(255,255,255,0.1);color:#fff;border:1px solid rgba(255,255,255,0.2)}
.btn-secondary:hover{background:rgba(255,255,255,0.15);border-color:rgba(255,255,255,0.3)}
.dash-hero-graphic{position:relative;z-index:1;display:flex;align-items:center;justify-content:center}
@media(max-width:768px){
  .dash-hero-graphic{display:none}
  .dash-hero{padding:28px 24px}
  .dash-hero h1{font-size:26px}
}
.hero-stats{display:flex;gap:32px;position:relative;flex-wrap:wrap}
.hero-stat{display:flex;flex-direction:column;align-items:flex-start}
.hero-stat .val{color:#fff;font-size:22px;font-weight:700;display:block;font-family:var(--font-mono)}
.hero-stat .lbl{color:rgba(255,255,255,.55);font-size:11px;font-weight:500;margin-top:2px}
.hero-sep{width:1px;background:rgba(255,255,255,.15);align-self:stretch}

.stat-card{background:var(--white);border-radius:var(--radius);border:1px solid var(--gray-200);padding:18px 20px;display:flex;align-items:center;gap:14px}
.stat-icon{width:44px;height:44px;border-radius:10px;display:flex;align-items:center;justify-content:center;font-size:20px;flex-shrink:0}
.stat-icon.teal{background:rgba(13,148,136,.1);color:var(--teal)}
.stat-icon.blue{background:rgba(59,130,246,.1);color:#3b82f6}
.stat-icon.orange{background:rgba(249,115,22,.1);color:#f97316}
.stat-icon.purple{background:rgba(139,92,246,.1);color:#8b5cf6}
.stat-val{font-size:22px;font-weight:700;color:var(--gray-900);font-family:var(--font-mono)}
.stat-lbl{font-size:12px;color:var(--gray-800);font-weight:600;margin-top:1px}

.quick-cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:14px;margin-bottom:24px}
.quick-card{background:var(--white);border:1px solid var(--gray-200);border-radius:var(--radius);padding:18px;cursor:pointer;transition:.2s;position:relative;overflow:hidden}
.quick-card::before{content:'';position:absolute;top:0;left:0;width:3px;height:100%;background:var(--teal);border-radius:3px 0 0 3px}
.quick-card:hover{border-color:var(--teal);box-shadow:var(--shadow-md);transform:translateY(-1px)}
.quick-card .qc-icon{font-size:22px;margin-bottom:10px}
.quick-card .qc-title{font-size:13.5px;font-weight:600;color:var(--gray-900);margin-bottom:4px}
.quick-card .qc-desc{font-size:12px;color:var(--gray-800);line-height:1.4;font-weight:500;}
.quick-card .qc-arrow{position:absolute;right:14px;top:50%;transform:translateY(-50%);color:var(--gray-800);font-size:16px;opacity:0;transition:.2s}
.quick-card:hover .qc-arrow{opacity:1;right:10px}

/* ── STUDY PAGE ── */
/* FIX #1: was 'flex-wrap:gap' which is invalid CSS — fixed to flex-wrap:wrap + gap */
.study-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:20px;flex-wrap:wrap;gap:12px}
.page-title{font-size:20px;font-weight:700;color:var(--gray-900)}
.page-subtitle{font-size:13px;color:var(--gray-800);font-weight:500;margin-top:2px}
.study-tabs{display:flex;gap:4px;background:var(--gray-100);border-radius:9px;padding:4px;margin-bottom:20px;flex-wrap:wrap}
.study-tab{padding:8px 16px;border-radius:7px;font-size:13px;font-weight:600;color:var(--gray-800);cursor:pointer;transition:.15s;white-space:nowrap}
.study-tab.active{background:var(--white);color:var(--teal);font-weight:600;box-shadow:var(--shadow)}
.study-tab:hover:not(.active){background:rgba(0,0,0,.04)}

.day-card{background:var(--white);border:1px solid var(--gray-200);border-radius:var(--radius);margin-bottom:14px;overflow:hidden}
.day-card-header{display:flex;align-items:center;gap:14px;padding:16px 20px;cursor:pointer;user-select:none}
.day-card-header:hover{background:var(--gray-50)}
.day-badge{background:var(--teal);color:#fff;font-size:11px;font-weight:700;padding:3px 10px;border-radius:20px;font-family:var(--font-mono);white-space:nowrap}
.day-title{font-size:14px;font-weight:700;color:var(--gray-900);flex:1}
.day-codes{font-size:11px;color:var(--gray-800);font-weight:600;font-family:var(--font-mono);margin-left:4px;display:none}
@media(min-width:700px){.day-codes{display:inline}}
.day-toggle{color:var(--gray-800);transition:.2s;font-size:18px;margin-left:auto;font-weight:700}
.day-card.open .day-toggle{transform:rotate(180deg);color:var(--teal)}
.day-card-body{display:none;padding:0 20px 20px;border-top:1px solid var(--gray-100)}
.day-card.open .day-card-body{display:block}

.skill-section{margin-top:18px}
.skill-label{font-size:11px;font-weight:700;color:var(--teal);text-transform:uppercase;letter-spacing:.8px;margin-bottom:10px;display:flex;align-items:center;gap:6px}
.skill-label .pt-code{background:rgba(13,148,136,.1);border:1px solid rgba(13,148,136,.2);padding:1px 6px;border-radius:4px;font-family:var(--font-mono);font-size:10px}
.cmd-table{width:100%;border-collapse:collapse;font-size:12.5px;margin-bottom:4px}
.cmd-table th{background:var(--gray-800);color:#fff;padding:7px 12px;text-align:left;font-weight:600;font-size:11px;letter-spacing:.3px}
.cmd-table th:first-child{border-radius:6px 0 0 0;width:28%}
.cmd-table th:last-child{border-radius:0 6px 0 0}
.cmd-table td{padding:7px 12px;border-bottom:1px solid var(--gray-100);vertical-align:top}
.cmd-table tr:last-child td{border-bottom:none}
.cmd-table tr:hover td{background:var(--teal-pale)}
.cmd-table td:first-child{color:var(--gray-900);font-weight:600}
.cmd-table td:last-child{font-family:var(--font-mono);color:var(--teal-dark);font-size:12px;word-break:break-all}
.cmd-table tr:nth-child(even) td{background:var(--gray-50)}
.cmd-table tr:nth-child(even):hover td{background:var(--teal-pale)}
.copy-btn{float:right;background:rgba(13,148,136,.1);border:1px solid rgba(13,148,136,.2);color:var(--teal);font-size:10px;padding:2px 7px;border-radius:4px;cursor:pointer;font-family:var(--font-mono);transition:.15s}
.copy-btn:hover{background:var(--teal);color:#fff}
.note-box{background:rgba(245,158,11,.07);border:1px solid rgba(245,158,11,.2);border-left:3px solid var(--yellow);border-radius:0 6px 6px 0;padding:10px 14px;font-size:12.5px;color:var(--gray-900);font-weight:500;margin:12px 0;line-height:1.6}
.info-box{background:var(--teal-pale);border:1px solid rgba(13,148,136,.2);border-left:3px solid var(--teal);border-radius:0 6px 6px 0;padding:10px 14px;font-size:12.5px;color:var(--teal-deep);font-weight:500;margin:12px 0;line-height:1.6}
.htb-box{background:rgba(15,23,42,.04);border:1px solid var(--gray-200);border-radius:8px;padding:12px 16px;margin-top:14px;display:flex;align-items:center;gap:10px}
.htb-box .htb-label{font-size:11px;font-weight:800;color:var(--gray-800);text-transform:uppercase;letter-spacing:.6px}
.htb-box .htb-machines{font-size:13px;font-weight:600;color:var(--gray-800);font-family:var(--font-mono)}

/* ── HTB MAP HERO ── */
.htb-hero{background:linear-gradient(135deg,var(--gray-900) 0%,#0d2137 60%,#0a2a1f 100%);border-radius:14px;padding:28px 32px;margin-bottom:20px;display:flex;align-items:flex-start;justify-content:space-between;gap:32px;flex-wrap:wrap;border:1px solid rgba(255,255,255,.06)}
.htb-hero-title{display:flex;align-items:center;gap:10px;font-size:20px;font-weight:800;color:#fff;margin-bottom:6px;letter-spacing:-.3px}
.htb-hero-sub{font-size:13px;color:rgba(255,255,255,.45);line-height:1.6;max-width:380px;margin-bottom:16px}
.htb-hero-stats{display:flex;align-items:center;gap:0}
.htb-hstat{display:flex;flex-direction:column;align-items:center;gap:2px}
.htb-hstat span:first-child{font-size:22px;font-weight:800;color:var(--teal-light);font-family:var(--font-mono)}
.htb-hstat span:last-child{font-size:10px;color:rgba(255,255,255,.35);text-transform:uppercase;letter-spacing:.8px;font-weight:600}
.htb-hstat-sep{width:1px;height:32px;background:rgba(255,255,255,.1);margin:0 20px}

/* Search */
.htb-hero-right{display:flex;flex-direction:column;gap:14px;min-width:320px}
.htb-search-wrap{position:relative;display:flex;align-items:center}
.htb-search-icon{position:absolute;left:12px;color:rgba(255,255,255,.3);pointer-events:none;flex-shrink:0}
.htb-search-input{width:100%;background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.12);border-radius:10px;padding:10px 44px 10px 38px;color:#fff;font-size:14px;font-family:var(--font-sans);outline:none;transition:.2s}
.htb-search-input::placeholder{color:rgba(255,255,255,.3)}
.htb-search-input:focus{border-color:var(--teal);background:rgba(255,255,255,.1);box-shadow:0 0 0 3px rgba(13,148,136,.15)}
.htb-search-kbd{position:absolute;right:12px;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.12);border-radius:4px;color:rgba(255,255,255,.3);font-size:11px;padding:2px 6px;font-family:var(--font-mono)}

/* Filter pills */
.htb-filters{display:flex;flex-direction:column;gap:8px}
.htb-filter-group{display:flex;align-items:center;gap:6px;flex-wrap:wrap}
.htb-filter-label{font-size:10px;font-weight:700;color:rgba(255,255,255,.3);text-transform:uppercase;letter-spacing:.8px;width:28px;flex-shrink:0}
.htb-fpill{padding:4px 10px;border-radius:20px;font-size:11px;font-weight:600;border:1px solid rgba(255,255,255,.12);color:rgba(255,255,255,.4);background:rgba(255,255,255,.04);cursor:pointer;transition:.15s;display:inline-flex;align-items:center;gap:4px;font-family:var(--font-sans)}
.htb-fpill:hover{border-color:rgba(255,255,255,.25);color:rgba(255,255,255,.7)}
.htb-fpill.active{background:rgba(13,148,136,.2);border-color:rgba(13,148,136,.4);color:var(--teal-light)}
.htb-fpill.easy.active{background:rgba(34,197,94,.15);border-color:rgba(34,197,94,.4);color:#4ade80}
.htb-fpill.medium.active{background:rgba(245,158,11,.15);border-color:rgba(245,158,11,.4);color:#fbbf24}
.htb-fpill.hard.active{background:rgba(239,68,68,.15);border-color:rgba(239,68,68,.4);color:#f87171}
.htb-fpill.insane.active{background:rgba(168,85,247,.15);border-color:rgba(168,85,247,.4);color:#c084fc}

/* Syllabus tab rail */
.htb-tab-rail{display:flex;gap:4px;flex-wrap:wrap;margin-bottom:20px;background:var(--gray-900);border-radius:12px;padding:6px;border:1px solid rgba(255,255,255,.06)}
.htb-stab{display:inline-flex;align-items:center;gap:6px;padding:8px 14px;border-radius:8px;font-size:12.5px;font-weight:600;color:rgba(255,255,255,.4);cursor:pointer;transition:.15s;white-space:nowrap;font-family:var(--font-sans);border:none;background:none}
.htb-stab:hover{color:rgba(255,255,255,.75);background:rgba(255,255,255,.06)}
.htb-stab.active{background:rgba(13,148,136,.2);color:var(--teal-light);border:1px solid rgba(13,148,136,.3)}
.htb-stab-icon{font-size:14px}
.htb-stab-code{font-family:var(--font-mono);font-size:9.5px;color:rgba(255,255,255,.25);margin-left:2px}
.htb-stab.active .htb-stab-code{color:rgba(153,246,228,.4)}

/* Section header (per syllabus group) */
.htb-section-header{display:flex;align-items:center;gap:12px;margin:0 0 14px}
.htb-section-badge{background:rgba(13,148,136,.15);border:1px solid rgba(13,148,136,.25);color:var(--teal-light);font-family:var(--font-mono);font-size:11px;font-weight:700;padding:3px 10px;border-radius:5px;white-space:nowrap}
.htb-section-title{font-size:15px;font-weight:700;color:var(--gray-900)}
.htb-section-line{flex:1;height:1px;background:var(--gray-200)}
.htb-section-count{font-size:11px;color:var(--gray-800);font-family:var(--font-mono);font-weight:700}
.htb-section-block{margin-bottom:28px}

/* Machine grid */
.htb-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:12px;margin-bottom:8px}

/* HTB Machine Cards */
.htb-card{background:var(--gray-900);border:1px solid rgba(255,255,255,.07);border-radius:10px;overflow:hidden;transition:.2s;display:flex;flex-direction:column;position:relative;cursor:default}
.htb-card:hover{border-color:rgba(13,148,136,.45);box-shadow:0 0 0 1px rgba(13,148,136,.2),0 6px 20px rgba(0,0,0,.3);transform:translateY(-2px)}
.htb-card-accent{height:3px;width:100%;flex-shrink:0}
.htb-card-accent.linux-accent{background:linear-gradient(90deg,#f97316,#fb923c)}
.htb-card-accent.windows-accent{background:linear-gradient(90deg,#3b82f6,#60a5fa)}
.htb-card-accent.other-accent{background:linear-gradient(90deg,var(--teal),var(--teal-mid))}
.htb-card-inner{padding:12px 14px 10px;flex:1;display:flex;flex-direction:column;gap:8px}
.htb-card-name{font-size:14px;font-weight:700;color:#fff;font-family:var(--font-mono);letter-spacing:-.2px}
.htb-card-badges{display:flex;gap:5px;flex-wrap:wrap}
.htb-os-badge{display:inline-flex;align-items:center;gap:3px;padding:2px 7px;border-radius:4px;font-size:10px;font-weight:700;letter-spacing:.3px}
.htb-os-badge.windows{background:rgba(59,130,246,.15);color:#60a5fa;border:1px solid rgba(59,130,246,.2)}
.htb-os-badge.linux{background:rgba(249,115,22,.13);color:#fb923c;border:1px solid rgba(249,115,22,.2)}
.htb-os-badge.other{background:rgba(13,148,136,.13);color:var(--teal-light);border:1px solid rgba(13,148,136,.2)}
.htb-diff-badge{padding:2px 7px;border-radius:4px;font-size:10px;font-weight:700;letter-spacing:.3px}
.htb-diff-badge.easy{background:rgba(34,197,94,.13);color:#4ade80;border:1px solid rgba(34,197,94,.2)}
.htb-diff-badge.medium{background:rgba(245,158,11,.13);color:#fbbf24;border:1px solid rgba(245,158,11,.2)}
.htb-diff-badge.hard{background:rgba(239,68,68,.13);color:#f87171;border:1px solid rgba(239,68,68,.2)}
.htb-diff-badge.insane{background:rgba(168,85,247,.13);color:#c084fc;border:1px solid rgba(168,85,247,.2)}
.htb-diff-badge.unknown{background:rgba(255,255,255,.07);color:rgba(255,255,255,.3);border:1px solid rgba(255,255,255,.1)}
.htb-card-topics{font-size:11px;color:rgba(255,255,255,.35);line-height:1.5;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.htb-card-footer{padding:8px 14px 10px;border-top:1px solid rgba(255,255,255,.05);display:flex;justify-content:flex-end}
.htb-link-btn{display:inline-flex;align-items:center;gap:4px;background:rgba(13,148,136,.13);color:var(--teal-light);border:1px solid rgba(13,148,136,.22);border-radius:5px;padding:4px 10px;font-size:11px;font-weight:700;text-decoration:none;transition:.15s;font-family:var(--font-mono);letter-spacing:.3px}
.htb-link-btn:hover{background:var(--teal);color:#fff;border-color:var(--teal)}
.htb-link-btn svg{transition:.15s}
.htb-link-btn:hover svg{transform:translate(2px,-2px)}

/* Empty state */
.htb-empty{text-align:center;padding:60px 20px;color:rgba(255,255,255,.3);font-family:var(--font-mono);font-size:13px;background:var(--gray-900);border-radius:12px;border:1px solid rgba(255,255,255,.05)}
.htb-empty .big{font-size:36px;margin-bottom:10px;opacity:.5}


/* ── REFERENCE ── */
.ref-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:16px}
.ref-card{background:var(--white);border:1px solid var(--gray-200);border-radius:var(--radius);overflow:hidden}
.ref-card-head{background:var(--gray-800);color:#fff;padding:10px 16px;font-size:13px;font-weight:600;display:flex;align-items:center;gap:8px}
.ref-card-head .pt{font-family:var(--font-mono);font-size:10px;color:rgba(255,255,255,.45);margin-left:auto}
.ref-card-body{padding:0}
.ref-row{display:flex;padding:7px 14px;border-bottom:1px solid var(--gray-100);font-size:12.5px;gap:10px;cursor:pointer}
.ref-row:last-child{border-bottom:none}
.ref-row:hover{background:var(--teal-pale)}
.ref-row .ref-key{font-family:var(--font-mono);color:var(--teal-dark);font-size:12px;flex-shrink:0;min-width:90px;font-weight:700}
.ref-row .ref-val{color:var(--gray-900);font-weight:500;font-size:12px;line-height:1.5}
.ref-row .ref-cmd{font-family:var(--font-mono);color:var(--teal-dark);font-size:11.5px;word-break:break-all;line-height:1.5}

/* ── SYLLABUS AREA ACCORDIONS ── */
.syllabus-area{background:var(--white);border:1px solid var(--gray-200);border-radius:var(--radius);overflow:hidden;transition:border-color 0.2s, box-shadow 0.2s}
.syllabus-area:hover{border-color:var(--gray-300);box-shadow:var(--shadow)}
.syllabus-area.expanded{border-color:var(--teal);box-shadow:var(--shadow-md)}
.area-header{display:flex;align-items:center;justify-content:space-between;padding:16px 20px;cursor:pointer;background:var(--white);user-select:none;transition:background 0.2s}
.area-header:hover{background:var(--gray-50)}
.area-title{display:flex;align-items:center;gap:12px;font-size:15px;font-weight:700;color:var(--gray-900)}
.area-icon{font-size:18px}
.area-chevron{color:var(--gray-800);transition:transform 0.2s ease;display:flex;align-items:center;justify-content:center}
.syllabus-area.expanded .area-chevron{transform:rotate(180deg);color:var(--teal)}
.area-body{display:none;border-top:1px solid var(--gray-100);background:var(--white)}
.syllabus-area.expanded .area-body{display:block}

/* ── PROGRESS ── */
/* FIX #3: progress-ring-wrap needs position:relative so absolute children are positioned correctly */
.progress-ring-wrap{display:flex;align-items:center;justify-content:center;flex-direction:column;gap:4px;position:relative;min-height:140px}
svg.ring{transform:rotate(-90deg)}
.ring-bg{fill:none;stroke:var(--gray-100)}
.ring-fill{fill:none;stroke:var(--teal);stroke-linecap:round;transition:stroke-dashoffset .6s ease}
.appendix-progress{display:grid;gap:10px}
.ap-row{display:flex;align-items:center;gap:12px}
.ap-label{width:90px;font-size:12px;font-weight:700;color:var(--gray-900);font-family:var(--font-mono)}
.ap-bar{flex:1;height:6px;background:var(--gray-100);border-radius:3px;overflow:hidden}
.ap-fill{height:100%;background:var(--teal);border-radius:3px;transition:.5s}
.ap-fill.warn{background:var(--yellow)}
.ap-fill.danger{background:var(--red)}
.ap-pct{font-size:12px;font-weight:700;color:var(--gray-900);font-family:var(--font-mono);width:36px;text-align:right}

/* ── CHECKLIST ── */
.checklist{display:grid;gap:8px}
.check-item{display:flex;align-items:flex-start;gap:12px;padding:12px 16px;background:var(--white);border:1.5px solid var(--gray-200);border-radius:8px;cursor:pointer;transition:.2s}
.check-item:hover{border-color:var(--teal)}
.check-item.done{background:rgba(13,148,136,.04);border-color:rgba(13,148,136,.3)}
.check-item.done .check-text{color:var(--gray-800);text-decoration:line-through}
.check-box{width:20px;height:20px;border-radius:5px;border:2px solid var(--gray-800);flex-shrink:0;display:flex;align-items:center;justify-content:center;transition:.2s;margin-top:1px}
.check-item.done .check-box{background:var(--teal);border-color:var(--teal);color:#fff}
.check-text{font-size:13.5px;font-weight:600;color:var(--gray-900);line-height:1.5}
.check-sub{font-size:12px;color:var(--gray-800);font-weight:600;margin-top:2px;font-family:var(--font-mono)}

/* ── TOAST ── */
#toast{position:fixed;bottom:24px;right:24px;background:var(--gray-900);color:#fff;padding:10px 18px;border-radius:8px;font-size:13px;font-weight:500;opacity:0;transform:translateY(10px);transition:.3s;pointer-events:none;z-index:999}
#toast.show{opacity:1;transform:translateY(0)}

/* ── MISC ── */
.section-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:16px}
.section-title{font-size:16px;font-weight:700;color:var(--gray-900)}
.section-action{font-size:12.5px;color:var(--teal);font-weight:600;cursor:pointer}
.section-action:hover{text-decoration:underline}
.empty-state{text-align:center;padding:40px;color:var(--gray-900);font-weight:600}
.empty-state .big{font-size:32px;margin-bottom:8px}
.tag{display:inline-flex;align-items:center;padding:2px 8px;border-radius:4px;font-size:11px;font-weight:600}
.tag-teal{background:rgba(13,148,136,.1);color:var(--teal-dark)}
.tag-red{background:rgba(239,68,68,.1);color:#dc2626}
.tag-green{background:rgba(34,197,94,.1);color:#15803d}

@media(max-width:900px){
  .hamburger{display:flex;align-items:center;justify-content:center}
  #sidebar{left:calc(-1 * var(--nav-width));box-shadow:none}
  #sidebar.open{left:0;box-shadow:var(--shadow-lg)}
  #main{margin-left:0;padding:20px 16px}
  .card-grid-4{grid-template-columns:repeat(2,1fr)}
  .card-grid-3{grid-template-columns:repeat(2,1fr)}
  .card-grid-2{grid-template-columns:1fr}
  #topbar .logo{min-width:unset}
  .day-codes{display:none!important}
}
@media(max-width:560px){
  .card-grid-4,.card-grid-3,.card-grid-2{grid-template-columns:1fr}
  .quick-cards{grid-template-columns:repeat(2,1fr)}
}

/* ── ABOUT PAGE ── */
.about-hero{background:linear-gradient(135deg,var(--gray-800) 0%,var(--gray-900) 100%);border-radius:14px;padding:32px;margin-bottom:24px;position:relative;overflow:hidden}
.about-hero h1{color:#fff;font-size:26px;font-weight:700;margin-bottom:6px;position:relative}
.about-hero p{color:rgba(255,255,255,.7);font-size:14px;position:relative}

.about-card{max-width:800px;margin:0 auto}
.profile-wrap{display:flex;gap:24px;flex-wrap:wrap;align-items:flex-start}
.profile-avatar{width:120px;height:120px;background:var(--teal);border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:48px;color:#fff;font-weight:700;flex-shrink:0}
.profile-content{flex:1}
.profile-name{font-size:24px;font-weight:700;color:var(--gray-900);margin-bottom:8px}
.profile-alias{font-size:16px;color:var(--gray-800);font-weight:600}
.profile-role{color:var(--teal);font-weight:600;margin-bottom:16px}
.profile-bio{color:var(--gray-900);font-weight:500;line-height:1.6;margin-bottom:24px}
.profile-bio p{margin-bottom:12px}
.profile-bio p:last-child{margin-bottom:0}
.profile-actions{display:flex;gap:12px;flex-wrap:wrap}
.profile-btn{display:inline-flex;align-items:center;gap:8px}

/* Markdown specific styles inside area-body */
.area-body h1, .area-body h2, .area-body h3, .area-body h4, .area-body h5, .area-body h6 {
    color: var(--primary);
    margin-top: 1.5rem;
    margin-bottom: 0.75rem;
    font-weight: 600;
}
.area-body h1 { font-size: 1.5rem; }
.area-body h2 { font-size: 1.25rem; border-bottom: 1px solid var(--border); padding-bottom: 0.3rem; }
.area-body h3 { font-size: 1.1rem; }
.area-body p {
    margin-bottom: 1rem;
    line-height: 1.6;
}
.area-body pre {
    background: #1e1e1e;
    color: #d4d4d4;
    padding: 1rem;
    border-radius: 6px;
    overflow-x: auto;
    margin-bottom: 1.2rem;
    border: 1px solid #333;
}
.area-body code {
    background: rgba(13, 148, 136, 0.1);
    color: var(--primary);
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    font-size: 0.9em;
}
.area-body pre code {
    background: transparent;
    color: inherit;
    padding: 0;
    border-radius: 0;
    font-size: 0.9em;
}
.area-body ul, .area-body ol {
    margin-bottom: 1rem;
    padding-left: 2rem;
}
.area-body li {
    margin-bottom: 0.5rem;
}
.area-body table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 1rem;
}
.area-body th, .area-body td {
    border: 1px solid var(--border);
    padding: 0.5rem;
    text-align: left;
}
.area-body th {
    background: var(--surface);
    font-weight: 600;
}