/* ═══════ MANODEMY — NOTEBOOK + CODEMIRROR VS CODE THEME (shared) ═══════ */
@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@400;600;700;800;900&family=Inter:wght@400;500;600&family=JetBrains+Mono:wght@400;500&display=swap');
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --bg:#0B0F19;--surface:#111827;--elevated:#1A2333;--code-bg:#1E1E1E;
  --cyan:#00E6F6;--gold:#F5A623;--purple:#A855F7;--green:#10B981;--rose:#F43F5E;--teal:#4DB6AC;
  --text:#E2E8F0;--muted:#94A3B8;--dim:#4B5563;--border:rgba(255,255,255,0.08);
  --font-h:'Outfit',sans-serif;--font-b:'Inter',sans-serif;--font-c:'JetBrains Mono',monospace;
  --r:12px;--sidebar-w:260px;
  --nav-bg:rgba(11,15,25,0.88);--nav-border:rgba(255,255,255,0.08);--nav-text:#E2E8F0;
  --avatar-size:42px;--avatar-bg-1:#4F46E5;--avatar-bg-2:#EC4899;--avatar-bg-3:#F59E0B;
}
html{scroll-behavior:auto}
body{background:var(--bg);color:var(--text);font-family:var(--font-b);padding-top:60px}

/* ═══════ NAV ═══════ */
.top-bar{position:fixed;top:0;left:0;right:0;z-index:999;height:72px;background:var(--bg);backdrop-filter:none;border-bottom:1px solid rgba(255,255,255,0.06);box-shadow:0 4px 30px rgba(0,0,0,0.5)}
.nav-inner{max-width:1400px;margin:0 auto;padding:0 1.5rem;display:flex;align-items:center;justify-content:space-between;height:100%}

/* ═══════ CENTER DROPDOWN ═══════ */
.has-dropdown{position:relative}
.nav-dropdown-btn{background:linear-gradient(145deg, rgba(30,41,59,0.8) 0%, rgba(15,23,42,0.95) 100%);border:none;border-top:1px solid rgba(255,255,255,0.15);border-bottom:1px solid rgba(0,0,0,0.8);border-radius:50px;padding:6px 16px 6px 8px;display:flex;align-items:center;gap:12px;cursor:pointer;transition:all 0.3s cubic-bezier(0.4, 0, 0.2, 1);box-shadow:-2px -2px 6px rgba(255,255,255,0.04), 4px 4px 10px rgba(0,0,0,0.5), inset 1px 1px 2px rgba(255,255,255,0.1)}
.nav-dropdown-btn:hover{background:linear-gradient(145deg, rgba(35,48,68,0.9), rgba(18,27,48,1));box-shadow:-2px -2px 8px rgba(255,255,255,0.06), 6px 6px 15px rgba(0,0,0,0.6), inset 1px 1px 2px rgba(255,255,255,0.2), 0 0 15px rgba(0,230,246,0.15);transform:translateY(-1px)}
.day-badge{background:rgba(0,230,246,0.15);color:var(--cyan);padding:4px 10px;border-radius:20px;font:700 0.75rem var(--font-h);letter-spacing:0.05em;text-transform:uppercase;box-shadow:0 0 10px rgba(0,230,246,0.1)}
.day-title{color:#fff;font:500 0.95rem var(--font-b)}
.dropdown-chevron{width:16px;height:16px;color:var(--muted);transition:transform 0.3s}
.nav-dropdown-btn.open .dropdown-chevron{transform:rotate(180deg);color:var(--cyan)}
.nav-dropdown-menu{position:absolute;top:calc(100% + 12px);left:50%;transform:translateX(-50%) translateY(10px);width:320px;background:rgba(15,23,42,0.95);backdrop-filter:blur(20px);border:1px solid rgba(255,255,255,0.1);border-radius:16px;box-shadow:0 20px 40px rgba(0,0,0,0.5), 0 0 0 1px rgba(0,230,246,0.1);opacity:0;visibility:hidden;transition:all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);z-index:1000;overflow:hidden}
.nav-dropdown-menu.show{opacity:1;visibility:visible;transform:translateX(-50%) translateY(0)}
.dropdown-header{padding:12px 16px;font:600 0.75rem var(--font-h);color:var(--muted);text-transform:uppercase;letter-spacing:0.06em;border-bottom:1px solid rgba(255,255,255,0.06);background:rgba(0,0,0,0.2)}
.dropdown-scroll{max-height:400px;overflow-y:auto;padding:8px}
.dropdown-scroll::-webkit-scrollbar{width:6px}
.dropdown-scroll::-webkit-scrollbar-track{background:transparent}
.dropdown-scroll::-webkit-scrollbar-thumb{background:rgba(255,255,255,0.1);border-radius:10px}
.dropdown-scroll::-webkit-scrollbar-thumb:hover{background:rgba(255,255,255,0.2)}
.dropdown-item{display:flex;align-items:center;gap:10px;padding:10px 12px;text-decoration:none;border-radius:10px;transition:all 0.2s;font:500 0.85rem var(--font-b);color:var(--text)}
.dropdown-item:hover{background:rgba(255,255,255,0.06);transform:translateX(4px)}
.dropdown-item.active{background:linear-gradient(90deg, rgba(0,230,246,0.1), transparent);border-left:2px solid var(--cyan);color:var(--cyan)}
.dropdown-item.active .day-num{color:var(--cyan)}
.day-num{font:600 0.75rem var(--font-h);color:var(--muted);width:45px;flex-shrink:0}
.day-em{font-size:1.1rem}

/* ═══════ ICONS & BUTTONS ═══════ */
.nav-icon-btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:8px 14px;border-radius:50px;font:700 0.85rem var(--font-h);text-decoration:none;transition:all 0.3s cubic-bezier(0.4, 0, 0.2, 1);background:linear-gradient(145deg, rgba(255,255,255,0.05), rgba(0,0,0,0.4));border:none;border-top:1px solid rgba(255,255,255,0.12);border-bottom:1px solid rgba(0,0,0,0.6);color:var(--text);box-shadow:-2px -2px 5px rgba(255,255,255,0.02), 3px 3px 8px rgba(0,0,0,0.4), inset 1px 1px 1px rgba(255,255,255,0.05)}
.nav-icon-btn svg{width:16px;height:16px}
.home-btn{padding:8px;border-radius:50%}
.home-btn:hover{color:var(--cyan)}
.nav-icon-btn:hover:not(.disabled){background:linear-gradient(145deg, rgba(255,255,255,0.08), rgba(0,0,0,0.5));box-shadow:-2px -2px 6px rgba(255,255,255,0.04), 4px 4px 10px rgba(0,0,0,0.5), inset 1px 1px 2px rgba(255,255,255,0.1);transform:translateY(-1px);color:var(--cyan)}
.nav-icon-btn:active:not(.disabled){background:rgba(0,0,0,0.4);box-shadow:inset 2px 2px 5px rgba(0,0,0,0.6), inset -1px -1px 2px rgba(255,255,255,0.05);border-top:1px solid rgba(0,0,0,0.6);border-bottom:1px solid rgba(255,255,255,0.05);transform:translateY(1px)}
.prev-btn.disabled{opacity:0.4;cursor:not-allowed;background:transparent;border:1px solid rgba(255,255,255,0.08);box-shadow:none}
.next-btn{background:linear-gradient(145deg, var(--cyan), #3b82f6);color:#fff;border:none;border-top:1px solid rgba(255,255,255,0.5);border-bottom:2px solid rgba(0,0,0,0.4);text-shadow:0 1px 2px rgba(0,0,0,0.3);box-shadow:-2px -2px 5px rgba(255,255,255,0.1), 4px 4px 12px rgba(0,0,0,0.5), inset 1px 1px 2px rgba(255,255,255,0.4), 0 0 15px rgba(0,230,246,0.3)}
.next-btn:hover{background:linear-gradient(145deg, #00f5ff, #4a90e2);transform:translateY(-2px);box-shadow:-2px -2px 8px rgba(255,255,255,0.2), 6px 6px 15px rgba(0,0,0,0.6), inset 1px 1px 3px rgba(255,255,255,0.6), 0 0 25px rgba(0,230,246,0.5)}
.next-btn:active{transform:translateY(1px);box-shadow:inset 2px 2px 8px rgba(0,0,0,0.3);border-top:1px solid rgba(0,0,0,0.2)}

/* ═══════ SCORE TRACKER CARD ═══════ */
.nav-score-card{display:flex;flex-direction:column;gap:6px;background:linear-gradient(145deg, #090c14, #0d121e);padding:10px 14px;border-radius:14px;border:none;border-bottom:1px solid rgba(255,255,255,0.1);border-top:1px solid rgba(0,0,0,0.8);min-width:180px;box-shadow:inset 2px 2px 6px rgba(0,0,0,0.8), inset -2px -2px 6px rgba(255,255,255,0.05), 0 1px 1px rgba(255,255,255,0.05)}
.score-grid{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:2px}
.score-col{display:flex;flex-direction:column;gap:1px;flex:1}
.score-divider{width:1px;height:24px;background:rgba(255,255,255,0.08);align-self:center}
.score-label{font:600 0.65rem var(--font-h);color:var(--muted);text-transform:uppercase;letter-spacing:0.06em}
.score-val{font:500 0.8rem var(--font-c);color:var(--muted);white-space:nowrap}
.score-highlight{font:800 0.95rem var(--font-h);color:var(--cyan);text-shadow:0 0 10px rgba(0,230,246,0.3)}
.score-slash{margin:0 2px;color:rgba(255,255,255,0.15)}
.score-track{height:4px;background:rgba(255,255,255,0.06);border-radius:2px;overflow:hidden}
.score-fill{height:100%;background:linear-gradient(90deg,var(--cyan),var(--purple));transition:width 0.4s cubic-bezier(0.4, 0, 0.2, 1);box-shadow:0 0 10px var(--cyan);border-radius:2px}

/* ═══════ ENGAGEMENT TIMER CARD ═══════ */
.nav-timer-card {
  display: flex;
  align-items: center;
  gap: 12px;
  background: linear-gradient(145deg, #090c14, #0d121e);
  padding: 8px 18px;
  border-radius: 14px;
  border: none;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  border-top: 1px solid rgba(0, 0, 0, 0.8);
  box-shadow: inset 2px 2px 6px rgba(0, 0, 0, 0.8), inset -2px -2px 6px rgba(255, 255, 255, 0.05), 0 1px 1px rgba(255, 255, 255, 0.05);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
  margin-right: 12px;
}
.nav-timer-card:hover {
  box-shadow: inset 2px 2px 8px rgba(0, 0, 0, 0.9), inset -2px -2px 8px rgba(255, 255, 255, 0.07), 0 1px 2px rgba(255, 255, 255, 0.08), 0 0 20px rgba(0, 230, 246, 0.15);
  transform: translateY(-1px);
}
.timer-info {
  display: flex;
  flex-direction: column;
  z-index: 2;
}
.timer-label {
  font: 700 0.65rem var(--font-h);
  background: linear-gradient(90deg, var(--cyan), var(--teal));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: 2px;
}
.timer-display {
  font: 800 1.15rem var(--font-c);
  color: #fff;
  text-shadow: 0 0 10px rgba(255, 255, 255, 0.2);
  font-variant-numeric: tabular-nums;
  line-height: 1;
}
/* Pulse ring animation behind the timer */
.timer-pulse-ring {
  position: absolute;
  right: -10px;
  top: 50%;
  transform: translateY(-50%);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 2px solid rgba(0, 230, 246, 0.3);
  opacity: 0;
  z-index: 1;
  pointer-events: none;
}
.timer-pulse-ring.active {
  animation: timerPulse 2s cubic-bezier(0.2, 0.8, 0.2, 1) infinite;
}
@keyframes timerPulse {
  0% { transform: translateY(-50%) scale(0.3); opacity: 0.8; border-color: rgba(0, 230, 246, 0.8); }
  100% { transform: translateY(-50%) scale(1.5); opacity: 0; border-color: rgba(168, 85, 247, 0.2); }
}

/* ═══════ PYODIDE STATUS ═══════ */
.pyodide-status{position:fixed;top:60px;left:0;right:0;text-align:center;padding:.4rem;font:500 .78rem var(--font-c);color:var(--gold);background:rgba(245,166,35,.08);border-bottom:1px solid rgba(245,166,35,.2);z-index:998;transition:all .4s}
.pyodide-status.ready{color:var(--green);background:rgba(16,185,129,.08);border-color:rgba(16,185,129,.2)}
.pyodide-status.hidden{transform:translateY(-100%);opacity:0}

/* ═══════ LAYOUT ═══════ */
.layout{display:flex;max-width:1400px;margin:1.5rem auto 0;padding:0 1rem;gap:0}
.notebook{flex:1;min-width:0;padding:0 2.5rem 4rem 1.5rem;max-width:calc(100% - var(--sidebar-w))}
.nb-title h1{font:900 clamp(1.5rem,3.5vw,2rem) var(--font-h);color:#fff;border-bottom:1px solid var(--border);padding-bottom:1rem;margin-bottom:2rem}

/* ═══════ SIDEBAR ═══════ */
.sidebar{position:sticky;top:80px;width:var(--sidebar-w);min-width:200px;max-width:350px;height:calc(100vh - 90px);display:flex;flex-direction:column;border-left:1px solid rgba(255,255,255,.05);flex-shrink:0;background:var(--bg);box-shadow:-5px 0 25px rgba(0,0,0,.3)}
.sidebar-top{padding:1rem .8rem .8rem;border-bottom:1px solid var(--border);flex-shrink:0}
.sidebar-header{font:800 1.15rem var(--font-h);color:var(--cyan);letter-spacing:.04em;display:flex;align-items:center;gap:6px;margin:0;padding:6px 10px;background:linear-gradient(145deg,rgba(0,230,246,.08),rgba(0,230,246,.02));border-radius:8px;border-top:1px solid rgba(255,255,255,.05);border-left:1px solid rgba(255,255,255,.02);box-shadow:inset 1px 1px 2px rgba(255,255,255,.05),2px 3px 8px rgba(0,0,0,.3);text-shadow:0 0 10px rgba(0,230,246,.2)}
.sidebar-header .icon{font-size:1.1rem;filter:drop-shadow(0 0 5px rgba(255,255,255,0.2))}
.toc-list{flex:1;overflow-y:auto;padding:.8rem .8rem 2rem;list-style:none;margin:0}
.sidebar li{margin-bottom:6px}
.toc-link{display:block;padding:.5rem .7rem;font:500 .8rem var(--font-b);color:var(--muted);text-decoration:none;border-radius:8px;background:linear-gradient(135deg,rgba(255,255,255,.02),rgba(0,0,0,.15));border:1px solid rgba(255,255,255,.03);border-top-color:rgba(255,255,255,.06);border-left-color:rgba(255,255,255,.04);box-shadow:2px 3px 6px rgba(0,0,0,.25);transition:all .25s cubic-bezier(.4,0,.2,1);position:relative;overflow:hidden}
.toc-link:hover{color:var(--cyan);background:linear-gradient(135deg,rgba(0,230,246,.04),rgba(0,0,0,.2));border-color:rgba(0,230,246,.1);border-top-color:rgba(0,230,246,.2);border-left-color:rgba(0,230,246,.15);box-shadow:3px 4px 10px rgba(0,0,0,.4),-1px -1px 4px rgba(255,255,255,.04);transform:translateY(-1px)}
.toc-link.active{color:var(--cyan);font-weight:600;background:linear-gradient(145deg,rgba(0,230,246,.12),rgba(0,230,246,.02));border:1px solid rgba(0,230,246,.2);border-top-color:rgba(0,230,246,.4);border-left-color:rgba(0,230,246,.3);box-shadow:inset 1px 1px 3px rgba(255,255,255,.1),inset -1px -1px 4px rgba(0,0,0,.4),4px 5px 12px rgba(0,0,0,.5);text-shadow:0 0 10px rgba(0,230,246,.3);transform:translateY(-2px)}
.sidebar-resize{position:absolute;left:-3px;top:0;bottom:0;width:6px;cursor:col-resize;z-index:10}
.sidebar-resize:hover{background:rgba(0,230,246,.2)}

/* ═══════ SECTIONS ═══════ */
.nb-section{margin-bottom:2.5rem;scroll-margin-top:80px}
.section-header{padding:12px 18px;border-radius:var(--r);margin-bottom:1.2rem}
.section-header.cyan{background:var(--cyan);color:#000}
.section-header.gold{background:linear-gradient(135deg,var(--gold),#D97706);color:#000}
.section-header.purple{background:linear-gradient(135deg,var(--purple),#7C3AED);color:#fff}
.section-header h2{font:700 1.05rem var(--font-h);margin:0;color:inherit}
h2{font:700 1.2rem var(--font-h);color:#fff;margin-bottom:1rem}
h3{font:600 1rem var(--font-h);color:var(--text);margin-bottom:.6rem}
.concept-header{margin:2rem 0 1rem;padding:10px 16px;background:var(--surface);border-left:5px solid #6366F1;border-radius:var(--r);scroll-margin-top:80px}
.concept-header h3{margin:0;color:#C7D2FE;font:700 .95rem var(--font-h)}

/* ═══════ TEXT ═══════ */
p{font-size:.92rem;line-height:1.75;color:var(--text);margin-bottom:.7rem;text-align:justify}
strong{color:#fff}
em{color:var(--gold)}
code{font-family:var(--font-c);font-size:.82em;background:rgba(0,230,246,.1);color:var(--cyan);padding:2px 5px;border-radius:4px;border:1px solid rgba(0,230,246,.12)}

/* ═══════ CALLOUTS ═══════ */
.callout{padding:.9rem 1.1rem;border-radius:var(--r);margin:1rem 0;border-left:4px solid var(--teal);background:rgba(77,182,172,.06);font-size:.88rem;line-height:1.7}
.callout.warning{border-left-color:var(--gold);background:rgba(245,166,35,.06)}
.callout.tip{border-left-color:var(--green);background:rgba(16,185,129,.06)}

/* ═══════ QUESTIONS — WHITE ═══════ */
.question{padding:.9rem 1.1rem;margin:.8rem 0 .4rem;background:#FFFFFF;color:#1a1a2e;border-radius:var(--r);border-left:4px solid #6366F1;box-shadow:0 2px 8px rgba(0,0,0,.15);scroll-margin-top:90px}
.question p, .question h1, .question h2, .question h3, .question h4, .question li{margin:0;font-size:.88rem;color:#1a1a2e;line-height:1.65}
.question h1, .question h2, .question h3, .question h4{margin-top:.4rem;margin-bottom:.2rem;font-size:.95rem;font-weight:600}
.question strong{color:#111}
.question code{background:rgba(99,102,241,.12);color:#4338CA;border-color:rgba(99,102,241,.2)}
.question.task{border-left-color:var(--gold);background:#FFFDF5}
.question.task code{color:#92400E;background:rgba(245,166,35,.12);border-color:rgba(245,166,35,.2)}
.question.interview{border-left-color:var(--purple);background:#FAF5FF}
.question.interview code{color:#6B21A8;background:rgba(168,85,247,.1);border-color:rgba(168,85,247,.2)}

/* ═══════ ✨ Solved Question Green Tick Mark ✨ ═══════ */
.question {
  position: relative;
}
.question.is-solved-box {
  padding-right: 44px;
}
.question.is-solved-box::after {
  content: '✓';
  position: absolute;
  top: 50%;
  right: 12px;
  transform: translateY(-50%);
  background: var(--emerald, #10B981);
  color: #080810;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 900;
  font-size: 14px;
  box-shadow: 0 0 12px rgba(16, 185, 129, 0.5);
  animation: tickPopIn 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards;
}
@keyframes tickPopIn {
  0% { transform: translateY(-50%) scale(0.5); opacity: 0; }
  100% { transform: translateY(-50%) scale(1); opacity: 1; }
}

/* ═══════ TABLE ═══════ */
table{width:100%;border-collapse:collapse;margin:1rem 0 1.2rem;font-size:.83rem}
thead th{text-align:left;padding:9px 10px;background:rgba(0,230,246,.08);color:var(--cyan);font:600 .76rem var(--font-h);text-transform:uppercase;letter-spacing:.04em;border-bottom:2px solid var(--border)}
tbody td{padding:7px 10px;border-bottom:1px solid var(--border);color:var(--text)}
tbody tr:hover{background:rgba(0,230,246,.03)}

/* ═══════ CODE CELLS — VS CODE CONTAINER ═══════ */
.code-cell{margin:.6rem 0 1.2rem;border:1px solid rgba(0,230,246,.12);border-radius:var(--r);overflow:hidden;background:var(--code-bg);box-shadow:0 3px 12px rgba(0,0,0,.25)}
.cell-bar{display:flex;align-items:center;justify-content:space-between;padding:5px 10px;background:rgba(255,255,255,.03);border-bottom:1px solid rgba(255,255,255,.06)}
.cell-label{font:500 .72rem var(--font-c);color:var(--green)}
.cell-actions{display:flex;gap:6px}
.run-btn{padding:3px 12px;background:linear-gradient(135deg,var(--green),#059669);color:#fff;font:600 .72rem var(--font-h);border:none;border-radius:5px;cursor:pointer;transition:all .15s}
.run-btn:hover{transform:scale(1.05);box-shadow:0 2px 8px rgba(16,185,129,.35)}
.run-btn:disabled{opacity:.5;cursor:wait}
.clear-btn{padding:3px 10px;background:transparent;color:var(--muted);font:500 .7rem var(--font-h);border:1px solid var(--border);border-radius:5px;cursor:pointer;transition:all .15s}
.clear-btn:hover{color:var(--rose);border-color:rgba(244,63,94,.3)}

/* ═══════ CODEMIRROR VS CODE DARK THEME ═══════ */
.CodeMirror{background:var(--code-bg)!important;color:#D4D4D4!important;font-family:var(--font-c)!important;font-size:.88rem!important;line-height:1.6!important;height:auto!important;border:none!important;padding:0!important}
.CodeMirror-gutters{background:#1E1E1E!important;border-right:1px solid #2d2d2d!important;min-width:40px}
.CodeMirror-linenumber{color:#858585!important;font-size:.75rem!important;padding:0 8px 0 4px!important}
.CodeMirror-cursor{border-left:2px solid #AEAFAD!important}
.CodeMirror-selected{background:rgba(38,79,120,0.6)!important}
.CodeMirror-activeline-background{background:#2a2d2e!important}
.CodeMirror-matchingbracket{color:#fff!important;background:rgba(0,100,200,.4)!important;outline:1px solid rgba(0,100,200,.6)!important}
.CodeMirror-foldgutter{width:14px}
.CodeMirror-foldgutter-open,.CodeMirror-foldgutter-folded{color:#858585!important;cursor:pointer}
.CodeMirror-focused .CodeMirror-selected{background:rgba(38,79,120,0.8)!important}

/* VS Code Token Colors */
.cm-s-default .cm-keyword{color:#C586C0!important}
.cm-s-default .cm-def{color:#DCDCAA!important}
.cm-s-default .cm-variable{color:#9CDCFE!important}
.cm-s-default .cm-variable-2{color:#9CDCFE!important}
.cm-s-default .cm-variable-3{color:#4EC9B0!important}
.cm-s-default .cm-type{color:#4EC9B0!important}
.cm-s-default .cm-string{color:#CE9178!important}
.cm-s-default .cm-string-2{color:#CE9178!important}
.cm-s-default .cm-number{color:#B5CEA8!important}
.cm-s-default .cm-comment{color:#6A9955!important;font-style:italic!important}
.cm-s-default .cm-operator{color:#D4D4D4!important}
.cm-s-default .cm-builtin{color:#4EC9B0!important}
.cm-s-default .cm-property{color:#9CDCFE!important}
.cm-s-default .cm-meta{color:#569CD6!important}
.cm-s-default .cm-atom{color:#569CD6!important}
.cm-s-default .cm-punctuation{color:#D4D4D4!important}
.cm-s-default .cm-bracket{color:#FFD700!important}
.cm-s-default .cm-tag{color:#569CD6!important}
.cm-s-default .cm-attribute{color:#92D1C8!important}
.cm-s-default .cm-error{color:#F44747!important}

/* Autocomplete */
.CodeMirror-hints{background:#252526!important;border:1px solid #454545!important;border-radius:4px!important;box-shadow:0 4px 16px rgba(0,0,0,.5)!important;z-index:9999!important}
.CodeMirror-hint{color:#D4D4D4!important;font-family:var(--font-c)!important;font-size:.8rem!important;padding:3px 10px!important}
.CodeMirror-hint-active{background:#04395E!important;color:#fff!important}

/* ═══════ OUTPUT ═══════ */
.cell-output{padding:8px 14px;border-top:1px solid rgba(255,255,255,.04);font:400 .82rem/1.55 var(--font-c);white-space:pre-wrap;word-break:break-word;max-height:280px;overflow-y:auto}
.cell-output.hidden{display:none}
.cell-output.success{color:var(--text);background:rgba(16,185,129,.04)}
.cell-output.error{color:var(--rose);background:rgba(244,63,94,.05)}
.cell-output .out-label{color:var(--rose);font-size:.7rem;margin-bottom:3px;display:block}

/* ═══════ SCROLLBAR ═══════ */
::-webkit-scrollbar{width:5px;height:5px}
::-webkit-scrollbar-track{background:transparent}
::-webkit-scrollbar-thumb{background:rgba(0,230,246,.18);border-radius:3px}
::selection{background:rgba(0,230,246,.3);color:#fff}

/* ═══════ RICH HTML (From Notebooks) ═══════ */
.nb-rich{margin:1rem 0;line-height:1.75;font-size:.92rem;color:var(--text)}
.nb-rich h1,.nb-rich h2,.nb-rich h3,.nb-rich h4{margin-top:1.5rem;margin-bottom:1rem;color:#fff}
.nb-rich table{width:100%;border-collapse:collapse;margin:1rem 0}
.nb-rich th,.nb-rich td{padding:8px 12px;border:1px solid var(--border)}
.nb-rich th{background:rgba(255,255,255,0.05);color:var(--cyan);font-weight:600}
.nb-rich p{margin-bottom:.8rem}
.nb-rich code{font-family:var(--font-c);font-size:.82em;background:rgba(255,255,255,.08);color:#fff;padding:2px 5px;border-radius:4px}

/* ═══════ CODE BLOCKS (from markdown fences) ═══════ */
.nb-code-block{background:#1E1E1E;color:#D4D4D4;font-family:var(--font-c);font-size:.85rem;line-height:1.6;padding:12px 16px;border-radius:var(--r);border:1px solid rgba(255,255,255,.06);margin:.8rem 0 1rem;overflow-x:auto;white-space:pre-wrap;word-break:break-word}
.nb-code-block code{background:none;border:none;padding:0;color:inherit;font-size:inherit}

/* ═══════ CHECKLIST ═══════ */
.checklist{margin:1.2rem 0;display:flex;flex-direction:column;gap:6px}
.check-item{display:flex;align-items:center;gap:8px;font:.85rem var(--font-b);color:var(--text);cursor:pointer;padding:5px 8px;border-radius:6px;transition:background .15s}
.check-item:hover{background:rgba(255,255,255,.03)}
.check-item input[type="checkbox"]{width:16px;height:16px;accent-color:var(--cyan);cursor:pointer}

/* ═══════ RESPONSIVE ═══════ */
@media(max-width:900px){
  .sidebar{display:none}
  .notebook{max-width:100%;padding:0 1rem 3rem}
  .nav-center{display:none}
}

/* ═══════ CONTENT INDENTATION ═══════ */
.notebook > p, .nb-section > p, .nb-rich > p,
.notebook > ul, .nb-section > ul, .nb-rich > ul,
.notebook > ol, .nb-section > ol, .nb-rich > ol,
.notebook > .callout, .nb-section > .callout, .nb-rich > .callout,
.notebook > .question, .nb-section > .question,
.notebook > .code-cell, .nb-section > .code-cell,
.notebook > .nb-code-block, .nb-section > .nb-code-block,
.notebook > .checklist, .nb-section > .checklist,
.nb-rich > div:not([style*="background-color"]) {
  margin-left: 1.5rem;
  margin-right: 1.5rem;
}

.notebook > table, .nb-section > table, .nb-rich > table {
  margin-left: 1.5rem;
  margin-right: 1.5rem;
  width: calc(100% - 3rem);
}

/* ═══════ NAV CONTAINER EXTENSIONS ═══════ */
.nav-container { display: flex; align-items: center; justify-content: space-between; padding: 0 1.5rem; }
.nav-zone--left, .nav-zone--right { display: flex; align-items: center; gap: 1rem; }
.nav-controls { display: flex; align-items: center; gap: 0.75rem; }

/* Navigation Center Flex Wrapper (holding chevrons + dropdown) */
.nav-center-flex {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* Stunning Circular Glassmorphic Chevron Buttons flanking dropdown */
.nav-center-flex .prev-btn,
.nav-center-flex .next-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  padding: 0;
  border-radius: 50%;
  background: linear-gradient(145deg, rgba(30, 41, 59, 0.7) 0%, rgba(15, 23, 42, 0.9) 100%);
  border: 1px solid rgba(255, 255, 255, 0.08);
  color: var(--muted);
  box-shadow: -1px -1px 3px rgba(255, 255, 255, 0.02), 2px 2px 5px rgba(0, 0, 0, 0.4);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  cursor: pointer;
}

.nav-center-flex .prev-btn svg,
.nav-center-flex .next-btn svg {
  width: 18px;
  height: 18px;
  margin: 0 !important;
  stroke-width: 2.5;
}

.nav-center-flex .prev-btn:hover:not(.disabled),
.nav-center-flex .next-btn:hover:not(.disabled) {
  background: linear-gradient(145deg, rgba(35, 48, 68, 0.85), rgba(18, 27, 48, 0.95));
  border-color: rgba(0, 230, 246, 0.5);
  color: var(--cyan);
  transform: translateY(-1.5px) scale(1.05);
  box-shadow: 0 0 12px rgba(0, 230, 246, 0.25);
}

.nav-center-flex .prev-btn:active:not(.disabled),
.nav-center-flex .next-btn:active:not(.disabled) {
  transform: translateY(0.5px);
  box-shadow: inset 1px 1px 3px rgba(0, 0, 0, 0.5);
}

.nav-center-flex .prev-btn.disabled,
.nav-center-flex .next-btn.disabled {
  opacity: 0.35;
  cursor: not-allowed;
  background: rgba(15, 23, 42, 0.2);
  border-color: rgba(255, 255, 255, 0.04);
  color: var(--dim);
  box-shadow: none;
  pointer-events: none;
}

/* Stunning Glassmorphic 'Score Card' Capsule Button (replacing home button) */
.scorecard-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: linear-gradient(135deg, rgba(56, 189, 248, 0.08), rgba(0, 230, 246, 0.03));
  border: 1px solid rgba(0, 230, 246, 0.25);
  border-radius: 50px;
  color: var(--cyan);
  font: 700 0.85rem var(--font-h) !important;
  text-decoration: none;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 0 0 10px rgba(0, 230, 246, 0.05), inset 0 1px 1px rgba(255, 255, 255, 0.05);
  height: 38px; /* Perfectly aligned to chevrons and start-coding-btn height */
}

.scorecard-btn svg {
  width: 14px;
  height: 14px;
  stroke-width: 2.5;
}

.scorecard-btn:hover {
  background: linear-gradient(135deg, rgba(56, 189, 248, 0.18), rgba(0, 230, 246, 0.08));
  border-color: rgba(0, 230, 246, 0.6);
  color: #fff !important;
  transform: translateY(-1.5px) scale(1.02);
  box-shadow: 0 0 15px rgba(0, 230, 246, 0.25);
}

.scorecard-btn:active {
  transform: translateY(0.5px);
  background: rgba(0, 0, 0, 0.4);
  box-shadow: inset 1px 1px 3px rgba(0, 0, 0, 0.5);
}

/* Ensure equal height and seamless layout order inside right nav zone controls */
.nav-controls .scorecard-btn {
  order: 1 !important;
}
.nav-controls .start-coding-btn,
.nav-controls #navCountdownTimer {
  order: 2 !important;
}

/* ═══════ AVATAR & PROFILE ═══════ */
.avatar-wrapper { position: relative; width: var(--avatar-size); height: var(--avatar-size); cursor: pointer; border-radius: 50%; padding: 3px; transition: all 0.3s; background: linear-gradient(145deg, #151a28, #0a0d14); box-shadow: 3px 3px 8px rgba(0,0,0,0.6), -2px -2px 5px rgba(255,255,255,0.03), inset 1px 1px 2px rgba(255,255,255,0.1), inset -1px -1px 2px rgba(0,0,0,0.5); }
.avatar-wrapper:hover { transform: scale(1.05) translateY(-2px); box-shadow: 5px 5px 12px rgba(0,0,0,0.7), -2px -2px 6px rgba(255,255,255,0.05), inset 1px 1px 3px rgba(0,230,246,0.4), 0 0 15px rgba(0,230,246,0.2); }
.avatar-circle { width: 100%; height: 100%; border-radius: 50%; overflow: hidden; display: flex; align-items: center; justify-content: center; font: 700 1rem var(--font-h); color: #fff; background: linear-gradient(145deg, var(--elevated), #090c14); box-shadow: inset 2px 2px 5px rgba(0,0,0,0.8), inset -1px -1px 2px rgba(255,255,255,0.1); }
.avatar-circle img { width: 100%; height: 100%; object-fit: cover; }
.avatar-status-dot { position: absolute; bottom: -2px; right: -2px; width: 13px; height: 13px; background: radial-gradient(circle at 30% 30%, #34d399, var(--green)); border-radius: 50%; border: 2px solid var(--bg); box-shadow: 0 0 8px var(--green), inset -2px -2px 4px rgba(0,0,0,0.4); }

.profile-card { position: fixed; top: 70px; left: 1.5rem; width: 300px; background: rgba(15,23,42,0.95); backdrop-filter: blur(20px); border: 1px solid var(--border); border-radius: 16px; padding: 1.5rem; box-shadow: 0 20px 40px rgba(0,0,0,0.5); opacity: 0; visibility: hidden; transform: translateY(-10px); transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1); z-index: 1000; }
.profile-card.is-open { opacity: 1; visibility: visible; transform: translateY(0); }
.profile-card__header { display: flex; justify-content: space-between; align-items: flex-start; margin-bottom: 1.5rem; border-bottom: 1px solid var(--border); padding-bottom: 1rem; }
.profile-card__name { font: 700 1.1rem var(--font-h); color: #fff; margin: 0 0 4px 0; }
.profile-card__email { font: 400 0.8rem var(--font-b); color: var(--muted); margin: 0; }
.profile-card__badge { font: 700 0.7rem var(--font-h); text-transform: uppercase; padding: 3px 8px; border-radius: 4px; background: rgba(255,255,255,0.1); color: var(--text); }
.profile-card__badge[data-plan="pro"] { background: linear-gradient(135deg, var(--gold), #D97706); color: #000; box-shadow: 0 2px 8px rgba(245,166,35,0.3); }

.profile-card__progress-section { margin-bottom: 1.5rem; }
.profile-card__progress-labels { display: flex; justify-content: space-between; align-items: baseline; }
.profile-card__progress-text { font: 600 0.85rem var(--font-h); color: var(--text); }
.profile-card__progress-pct { font: 800 1.2rem var(--font-h); color: var(--cyan); }

.profile-card__signout { width: 100%; padding: 10px; background: rgba(255,255,255,0.05); border: 1px solid var(--border); color: var(--rose); font: 600 0.85rem var(--font-h); border-radius: 8px; cursor: pointer; transition: all 0.2s; }
.profile-card__signout:hover { background: rgba(244,63,94,0.1); border-color: rgba(244,63,94,0.3); }

/* ═══════ PAYWALL PRELOAD & TOAST ═══════ */
.paywall-preload { position: fixed; inset: 0; z-index: 9999; background: var(--bg); display: flex; align-items: center; justify-content: center; }
.paywall-preload__spinner { width: 40px; height: 40px; border: 3px solid rgba(0,230,246,0.2); border-top-color: var(--cyan); border-radius: 50%; animation: spin 1s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

.upgrade-toast { position: fixed; bottom: 2rem; left: 50%; transform: translateX(-50%) translateY(20px); background: rgba(15,23,42,0.95); backdrop-filter: blur(15px); border: 1px solid var(--purple); border-radius: 12px; padding: 1rem 1.5rem; display: flex; align-items: center; gap: 1rem; box-shadow: 0 10px 30px rgba(0,0,0,0.5), 0 0 15px rgba(168,85,247,0.2); z-index: 10000; opacity: 0; visibility: hidden; transition: all 0.4s cubic-bezier(0.34, 1.56, 0.64, 1); }
.upgrade-toast.is-visible { opacity: 1; visibility: visible; transform: translateX(-50%) translateY(0); }
.upgrade-toast__icon { color: var(--gold); display: flex; }
.upgrade-toast__headline { font: 700 0.95rem var(--font-h); color: #fff; margin: 0 0 2px 0; }
.upgrade-toast__sub { font: 400 0.8rem var(--font-b); color: var(--muted); margin: 0; }
.upgrade-toast__cta { padding: 6px 12px; background: linear-gradient(135deg, var(--cyan), var(--purple)); color: #fff; font: 700 0.8rem var(--font-h); text-decoration: none; border-radius: 6px; white-space: nowrap; transition: transform 0.2s; }
.upgrade-toast__cta:hover { transform: scale(1.05); }
.upgrade-toast__dismiss { background: transparent; border: none; color: var(--muted); font-size: 1.2rem; cursor: pointer; padding: 0 5px; transition: color 0.2s; }
.upgrade-toast__dismiss:hover { color: var(--rose); }

/* Day Card Locked logic */
.day-card--locked { position: relative; overflow: hidden; pointer-events: auto !important; }
.day-card--locked::after { content: ''; position: absolute; inset: 0; backdrop-filter: blur(4px); background: rgba(11,15,25,0.4); z-index: 1; pointer-events: none; }
.lock-overlay { position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%); z-index: 2; display: flex; flex-direction: column; align-items: center; gap: 8px; color: var(--gold); }
.lock-overlay svg { width: 24px; height: 24px; animation: pulse 2s infinite; }
@keyframes pulse { 0% { transform: scale(1); opacity: 0.8; } 50% { transform: scale(1.1); opacity: 1; } 100% { transform: scale(1); opacity: 0.8; } }

/* ═══════ MANO VOICE ASSISTANT ═══════ */

/* Floating Mute Button */
.mano-mute-btn {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: 1px solid rgba(255,255,255,0.1);
  background: rgba(17, 24, 39, 0.85);
  backdrop-filter: blur(12px);
  color: var(--cyan);
  font-size: 1.3rem;
  cursor: pointer;
  z-index: 998;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 0 4px 20px rgba(0,0,0,0.4);
  will-change: transform;
}
.mano-mute-btn:hover {
  transform: scale(1.1);
  border-color: rgba(0,230,246,0.4);
  box-shadow: 0 4px 20px rgba(0,0,0,0.4), 0 0 15px rgba(0,230,246,0.2);
}
.mano-mute-btn.mano-muted {
  color: var(--muted);
  border-color: rgba(255,255,255,0.05);
}
.mano-mute-btn.mano-speaking {
  animation: manoPulse 1s ease-in-out infinite;
  border-color: rgba(0,230,246,0.5);
  box-shadow: 0 0 20px rgba(0,230,246,0.3);
}
@keyframes manoPulse {
  0%, 100% { transform: scale(1); box-shadow: 0 0 15px rgba(0,230,246,0.2); }
  50% { transform: scale(1.08); box-shadow: 0 0 25px rgba(0,230,246,0.4); }
}

/* Voice Toast Bubble */
.mano-toast {
  position: absolute;
  bottom: -8px;
  left: 12px;
  right: 12px;
  transform: translateY(100%);
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border-radius: 10px;
  font: 500 0.82rem var(--font-b);
  z-index: 100;
  opacity: 0;
  transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
  pointer-events: none;
  backdrop-filter: blur(8px);
  will-change: transform, opacity;
}
.mano-toast-visible {
  opacity: 1;
  transform: translateY(calc(100% + 8px));
}
.mano-toast-icon { font-size: 1.2rem; flex-shrink: 0; }
.mano-toast-text { color: var(--text); line-height: 1.4; }

/* Toast Color Variants */
.mano-toast-correct {
  background: rgba(16, 185, 129, 0.12);
  border: 1px solid rgba(16, 185, 129, 0.25);
}
.mano-toast-correct .mano-toast-text { color: #6EE7B7; }

.mano-toast-partial {
  background: rgba(245, 158, 11, 0.12);
  border: 1px solid rgba(245, 158, 11, 0.25);
}
.mano-toast-partial .mano-toast-text { color: #FCD34D; }

.mano-toast-error {
  background: rgba(239, 68, 68, 0.12);
  border: 1px solid rgba(239, 68, 68, 0.25);
}
.mano-toast-error .mano-toast-text { color: #FCA5A5; }

.mano-toast-streak {
  background: rgba(139, 92, 246, 0.12);
  border: 1px solid rgba(139, 92, 246, 0.25);
}
.mano-toast-streak .mano-toast-text { color: #C4B5FD; }

/* Cell Glow Animations */
.mano-glow-correct { animation: manoGlowGreen 1.5s ease-out; }
.mano-glow-partial { animation: manoGlowAmber 1.5s ease-out; }
.mano-glow-error   { animation: manoGlowRed 1.5s ease-out; }
.mano-glow-streak  { animation: manoGlowPurple 1.5s ease-out; }

@keyframes manoGlowGreen {
  0% { border-color: rgba(16,185,129,0.8); box-shadow: 0 0 20px rgba(16,185,129,0.3); }
  100% { border-color: rgba(0,230,246,0.12); box-shadow: none; }
}
@keyframes manoGlowAmber {
  0% { border-color: rgba(245,158,11,0.8); box-shadow: 0 0 20px rgba(245,158,11,0.3); }
  100% { border-color: rgba(0,230,246,0.12); box-shadow: none; }
}
@keyframes manoGlowRed {
  0% { border-color: rgba(239,68,68,0.8); box-shadow: 0 0 20px rgba(239,68,68,0.3); }
  100% { border-color: rgba(0,230,246,0.12); box-shadow: none; }
}
@keyframes manoGlowPurple {
  0% { border-color: rgba(139,92,246,0.8); box-shadow: 0 0 20px rgba(139,92,246,0.3); }
  100% { border-color: rgba(0,230,246,0.12); box-shadow: none; }
}

/* Celebration Glow (all questions done) */
.mano-glow-celebrate {
  animation: manoCelebrate 2s ease-out;
}
@keyframes manoCelebrate {
  0% { box-shadow: inset 0 0 60px rgba(0,230,246,0.15); }
  50% { box-shadow: inset 0 0 80px rgba(139,92,246,0.12); }
  100% { box-shadow: none; }
}

/* Mobile responsive */
@media(max-width: 600px) {
  .mano-mute-btn { width: 42px; height: 42px; bottom: 16px; right: 16px; font-size: 1.1rem; }
  .mano-toast { left: 4px; right: 4px; font-size: 0.78rem; padding: 8px 10px; }
}

/* ═══════ MANO HINT SYSTEM ═══════ */

/* Hint Button (in cell-actions bar) */
.hint-btn {
  padding: 3px 10px;
  background: rgba(245, 158, 11, 0.08);
  color: var(--gold);
  font: 600 0.72rem var(--font-h);
  border: 1px solid rgba(245, 158, 11, 0.2);
  border-radius: 5px;
  cursor: pointer;
  transition: all 0.2s;
}
.hint-btn:hover {
  background: rgba(245, 158, 11, 0.15);
  border-color: rgba(245, 158, 11, 0.4);
  transform: scale(1.05);
  box-shadow: 0 2px 8px rgba(245, 158, 11, 0.2);
}

/* Hint Popup (sibling after cell — flow-based, never moves) */
.mano-hint-popup {
  margin: 8px 12px 16px;
  background: rgba(15, 23, 42, 0.97);
  backdrop-filter: blur(16px);
  border: 1px solid rgba(245, 158, 11, 0.25);
  border-radius: 12px;
  opacity: 0;
  transform: translateY(-6px);
  transition: opacity 0.25s ease, transform 0.25s ease;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5), 0 0 0 1px rgba(245, 158, 11, 0.08);
  overflow: hidden;
}
.mano-hint-visible {
  opacity: 1;
  transform: translateY(0);
}
.mano-hint-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 14px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  background: rgba(0, 0, 0, 0.2);
}
.mano-hint-title {
  font: 700 0.8rem var(--font-h);
  color: var(--gold);
}
.mano-hint-close {
  background: none;
  border: none;
  color: var(--muted);
  font-size: 1.2rem;
  cursor: pointer;
  padding: 0 4px;
  transition: color 0.2s;
  line-height: 1;
}
.mano-hint-close:hover { color: var(--rose); }
.mano-hint-body {
  padding: 12px 14px;
  font: 400 0.85rem var(--font-b);
  color: var(--text);
  line-height: 1.65;
  transition: opacity 0.15s ease;
}
.mano-hint-body code {
  background: rgba(0, 230, 246, 0.1);
  color: var(--cyan);
  padding: 1px 4px;
  border-radius: 3px;
  font-family: var(--font-c);
  font-size: 0.82em;
}
.mano-hint-next {
  display: block;
  width: calc(100% - 28px);
  margin: 0 14px 12px;
  padding: 7px 12px;
  background: rgba(245, 158, 11, 0.1);
  color: var(--gold);
  font: 600 0.78rem var(--font-h);
  border: 1px solid rgba(245, 158, 11, 0.2);
  border-radius: 6px;
  cursor: pointer;
  text-align: center;
  transition: all 0.2s;
}
.mano-hint-next:hover {
  background: rgba(245, 158, 11, 0.2);
  border-color: rgba(245, 158, 11, 0.4);
}
.mano-hint-final {
  padding: 8px 14px 12px;
  font: 500 0.78rem var(--font-b);
  color: var(--muted);
  text-align: center;
  font-style: italic;
}

@media(max-width: 600px) {
  .mano-hint-popup { left: 4px; right: 4px; }
  .mano-hint-body { font-size: 0.8rem; padding: 10px; }
}

/* ═══════ DUAL-MODE SEGMENTED TOGGLE SWITCH (COLOR SCIENCE UPGRADE) ═══════ */
.mode-toggle-segmented {
  display: flex;
  background: #090d16; /* deep cosmic tray */
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: 14px;
  padding: 4px;
  margin-bottom: 15px;
  box-shadow: 
    inset 0 4px 10px rgba(0, 0, 0, 0.6), 
    0 1px 1px rgba(255, 255, 255, 0.05),
    0 8px 24px rgba(0, 0, 0, 0.35);
  position: relative;
  z-index: 10;
  width: 100%;
  overflow: hidden;
  transition: all 0.4s ease;
}

.mode-segment-btn {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: transparent;
  border: none;
  color: var(--muted);
  font: 700 0.82rem var(--font-h);
  padding: 10px 14px;
  border-radius: 10px;
  cursor: pointer;
  transition: all 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
  outline: none;
  position: relative;
  overflow: hidden;
  letter-spacing: 0.03em;
}

/* Hover highlights for inactive button segments */
.mode-segment-btn:hover:not(.active) {
  color: #fff;
  background: rgba(255, 255, 255, 0.03);
}

/* --- ACTIVE STATE CHROMATIC GLOWS --- */

/* 1. READ MODE (Warm intellectual gold gradient + rich contrast dark text) */
.mode-segment-btn.active.segment-read {
  background: linear-gradient(135deg, #F5A623 0%, #D97706 100%);
  color: #05070a; /* solid obsidian black text for superb clarity */
  font-weight: 800;
  box-shadow: 
    0 4px 12px rgba(245, 166, 35, 0.35),
    inset 0 1px 2px rgba(255, 255, 255, 0.35);
  text-shadow: 0 1px 1px rgba(255, 255, 255, 0.1);
}

/* 2. PRACTICE MODE (Technical cyber-cyan/blue gradient + rich contrast dark text) */
.mode-segment-btn.active.segment-practice {
  background: linear-gradient(135deg, #00E6F6 0%, #0099FF 100%);
  color: #05070a; /* solid obsidian black text for superb clarity */
  font-weight: 800;
  box-shadow: 
    0 4px 12px rgba(0, 230, 246, 0.35),
    inset 0 1px 2px rgba(255, 255, 255, 0.35);
  text-shadow: 0 1px 1px rgba(255, 255, 255, 0.1);
}

/* Cosmic accent shifts on container border based on active mode */
.mode-toggle-segmented:has(.segment-read.active) {
  border-color: rgba(245, 166, 35, 0.18);
  box-shadow: 
    inset 0 4px 10px rgba(0, 0, 0, 0.6),
    0 0 20px rgba(245, 166, 35, 0.06);
}

.mode-toggle-segmented:has(.segment-practice.active) {
  border-color: rgba(0, 230, 246, 0.18);
  box-shadow: 
    inset 0 4px 10px rgba(0, 0, 0, 0.6),
    0 0 20px rgba(0, 230, 246, 0.06);
}

/* Float on body mobile fallback */
body > .mode-toggle-segmented {
  position: fixed;
  bottom: 24px;
  left: 24px;
  width: calc(100% - 48px);
  max-width: 300px;
  z-index: 998;
  box-shadow: 0 10px 35px rgba(0, 0, 0, 0.55);
}

/* ═══════ PRACTICE MODE — COMPLETE CONTENT HIDING ═══════ */

/* ── 1. THEORY SECTIONS (sec-*): Hide all body content ── */
body.practice-mode-active .nb-section[id^="sec-"] > p,
body.practice-mode-active .nb-section[id^="sec-"] > ul,
body.practice-mode-active .nb-section[id^="sec-"] > ol,
body.practice-mode-active .nb-section[id^="sec-"] > table,
body.practice-mode-active .nb-section[id^="sec-"] > .callout,
body.practice-mode-active .nb-section[id^="sec-"] > .nb-code-block,
body.practice-mode-active .nb-section[id^="sec-"] > .code-cell,
body.practice-mode-active .nb-section[id^="sec-"] > .checklist,
body.practice-mode-active .nb-section[id^="sec-"] > .question {
  display: none !important;
}

/* ── 2. Hide all content INSIDE .nb-rich blocks in theory sections ── */
body.practice-mode-active .nb-section[id^="sec-"] .nb-rich > *:not(h2) {
  display: none !important;
}

/* ── 3. Always show the topic h2 heading (coloured section title) ── */
body.practice-mode-active .nb-section[id^="sec-"] .nb-rich > h2,
body.practice-mode-active .nb-section[id^="sec-"] > h2 {
  display: block !important;
}

/* ── 4. Hide Enterprise Objective section entirely in practice mode ── */
body.practice-mode-active .nb-section#sec-0 {
  display: none !important;
}

/* ── 5. Practice mode subtle background tint on concept check sections ── */
body.practice-mode-active .nb-section[id^="checks-"] {
  border-left: 2px solid rgba(0, 230, 246, 0.15);
  border-radius: 0 8px 8px 0;
  padding-left: 8px;
  margin-left: -10px;
}

/* ── 6. Practice mode banner at top of notebook ── */
body.practice-mode-active .nb-title::after {
  content: "🎯 Practice Mode — Theory hidden. Questions & code cells only.";
  display: block;
  margin-top: 8px;
  padding: 8px 16px;
  background: linear-gradient(135deg, rgba(0,230,246,0.08), rgba(0,153,255,0.06));
  border: 1px solid rgba(0,230,246,0.2);
  border-radius: 8px;
  font: 600 0.8rem var(--font-h);
  color: var(--cyan);
  letter-spacing: 0.03em;
  animation: practiceModeFadeIn 0.5s ease forwards;
}
@keyframes practiceModeFadeIn {
  from { opacity: 0; transform: translateY(-6px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ═══════ STUNNING GAMIFIED MARKING SYSTEM COMPONENTS ═══════ */

/* Stunning pulsing "Start Coding" button in navigation bar */
.start-coding-btn {
  background: linear-gradient(135deg, #00E6F6 0%, #8B5CF6 100%);
  color: #0b0f19 !important;
  font: 800 0.8rem var(--font-h) !important;
  border: none;
  border-radius: 50px;
  padding: 8px 18px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  box-shadow: 0 0 15px rgba(0, 230, 246, 0.4), inset 0 1px 2px rgba(255, 255, 255, 0.3);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  animation: neonStartPulse 2s infinite;
  text-decoration: none;
  font-weight: 900;
}
.start-coding-btn:hover {
  transform: scale(1.05) translateY(-1px);
  box-shadow: 0 0 25px rgba(0, 230, 246, 0.8), 0 0 15px rgba(139, 92, 246, 0.5), inset 0 1px 2px rgba(255, 255, 255, 0.5);
  background: linear-gradient(135deg, #00f5ff 0%, #a855f7 100%);
}
.start-coding-btn:active {
  transform: scale(0.98) translateY(1px);
}
@keyframes neonStartPulse {
  0% { box-shadow: 0 0 12px rgba(0, 230, 246, 0.4); }
  50% { box-shadow: 0 0 24px rgba(0, 230, 246, 0.8), 0 0 12px rgba(139, 92, 246, 0.6); }
  100% { box-shadow: 0 0 12px rgba(0, 230, 246, 0.4); }
}

/* Glassmorphic Locked Overlay for Notebook Content */
.notebook-container-relative {
  position: relative !important;
}
.notebook-lock-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  min-height: 500px;
  background: rgba(11, 15, 25, 0.75);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  z-index: 900;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  padding-top: 100px;
  opacity: 1;
  visibility: visible;
  transition: opacity 0.4s ease, visibility 0.4s ease;
  border-radius: var(--r);
}
.notebook-lock-overlay.unlocked {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}
.notebook-lock-content {
  background: linear-gradient(145deg, rgba(22, 30, 49, 0.95), rgba(13, 18, 30, 0.98));
  border: 1px solid rgba(0, 230, 246, 0.25);
  border-radius: 24px;
  padding: 3.5rem 2.5rem;
  max-width: 550px;
  width: 90%;
  box-shadow: 0 30px 60px rgba(0,0,0,0.8), 0 0 40px rgba(0, 230, 246, 0.15), inset 0 1px 1px rgba(255,255,255,0.05);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
  text-align: center;
  animation: floatLockOverlay 4s ease-in-out infinite;
}
@keyframes floatLockOverlay {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-6px); }
}
.lock-icon-wrapper {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: rgba(0, 230, 246, 0.1);
  border: 1px solid rgba(0, 230, 246, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--cyan);
  box-shadow: 0 0 25px rgba(0, 230, 246, 0.2);
  margin-bottom: 0.5rem;
}
.lock-icon-wrapper svg {
  width: 36px;
  height: 36px;
  filter: drop-shadow(0 0 5px rgba(0, 230, 246, 0.5));
}
.lock-title {
  font: 900 1.65rem var(--font-h);
  color: #fff;
  letter-spacing: 0.03em;
  background: linear-gradient(135deg, #fff 40%, rgba(255,255,255,0.7));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.lock-desc {
  font: 400 0.95rem/1.6 var(--font-b);
  color: var(--muted);
}
.lock-desc strong {
  color: var(--cyan);
  text-shadow: 0 0 8px rgba(0,230,246,0.3);
}
.lock-action-btn {
  background: linear-gradient(135deg, #00E6F6 0%, #8B5CF6 100%);
  color: #0b0f19 !important;
  font: 800 0.95rem var(--font-h) !important;
  border: none;
  border-radius: 50px;
  padding: 12px 32px;
  cursor: pointer;
  box-shadow: 0 0 20px rgba(0, 230, 246, 0.4), inset 0 1px 2px rgba(255,255,255,0.4);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: 900;
  transition: all 0.3s;
  display: flex;
  align-items: center;
  gap: 10px;
}
.lock-action-btn:hover {
  transform: scale(1.05);
  box-shadow: 0 0 30px rgba(0, 230, 246, 0.8), 0 0 15px rgba(139, 92, 246, 0.4);
  background: linear-gradient(135deg, #00f5ff 0%, #a855f7 100%);
}
.lock-action-btn:active {
  transform: scale(0.98);
}

/* Custom Stunning Dialog Modal */
/* Custom Stunning Dialog Modal (Workbook Locked) */
.custom-warning-modal {
  position: fixed;
  inset: 0;
  background: rgba(11, 15, 25, 0.85);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  z-index: 10000;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow-y: auto;
  padding: 1.5rem 1rem;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}
.custom-warning-modal.show {
  opacity: 1;
  visibility: visible;
}
.workbook-locked-card {
  background: linear-gradient(145deg, #0b0f19, #05070a);
  border: 1px solid rgba(0, 230, 246, 0.25);
  border-radius: 20px;
  padding: 1.75rem 1.5rem 1.5rem 1.5rem;
  max-width: 600px;
  width: 100%;
  box-shadow: 
    0 25px 50px rgba(0, 0, 0, 0.85), 
    0 0 50px rgba(0, 230, 246, 0.12),
    inset 0 1px 1px rgba(255, 255, 255, 0.05);
  text-align: center;
  transform: scale(0.95);
  transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.85rem;
}
.custom-warning-modal.show .workbook-locked-card {
  transform: scale(1);
}

/* Graded Challenge Marking System Grid */
.marking-system-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.65rem;
  width: 100%;
  margin-top: 0.25rem;
  margin-bottom: 0.25rem;
}
.marking-card {
  background: linear-gradient(145deg, rgba(16, 24, 48, 0.6), rgba(10, 14, 26, 0.7));
  border: 1px solid rgba(255, 255, 255, 0.04);
  border-radius: 12px;
  padding: 0.75rem 0.9rem;
  text-align: left;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  transition: all 0.3s ease;
}
.marking-card:hover {
  border-color: rgba(0, 230, 246, 0.2);
  background: linear-gradient(145deg, rgba(16, 24, 48, 0.75), rgba(10, 14, 26, 0.85));
  transform: translateY(-2px);
  box-shadow: 0 6px 15px rgba(0, 0, 0, 0.3);
}
.marking-card-header {
  display: flex;
  align-items: center;
  gap: 6px;
}
.marking-card-icon {
  font-size: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
}
.marking-card-title {
  font-family: var(--font-h);
  font-size: 0.8rem;
  font-weight: 700;
  color: #fff;
  letter-spacing: 0.02em;
}
.marking-card-body {
  font-family: var(--font-b);
  font-size: 0.74rem;
  line-height: 1.4;
  color: #94a3b8;
}
.marking-card-highlight {
  color: #00E6F6;
  font-weight: 700;
}
.marking-card-highlight-gold {
  color: #F5A623;
  font-weight: 700;
}
.marking-card-highlight-green {
  color: #10B981;
  font-weight: 700;
}
@media (max-width: 600px) {
  .marking-system-grid {
    grid-template-columns: 1fr;
    gap: 0.6rem;
  }
  .workbook-locked-card {
    padding: 1.5rem 1rem 1.25rem 1rem;
  }
}
.lock-icon-circle {
  width: 58px;
  height: 58px;
  border-radius: 50%;
  border: 1.5px solid rgba(0, 230, 246, 0.35);
  background: rgba(0, 230, 246, 0.04);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #00E6F6;
  box-shadow: 0 0 20px rgba(0, 230, 246, 0.15);
  margin-bottom: 0px;
}
.lock-svg {
  width: 24px;
  height: 24px;
  filter: drop-shadow(0 0 6px rgba(0, 230, 246, 0.5));
}
.lock-title {
  font: 800 1.6rem var(--font-h);
  color: #fff;
  letter-spacing: 0.02em;
  margin: 0;
}
.lock-desc {
  font: 400 0.95rem/1.65 var(--font-b);
  color: #94a3b8;
  max-width: 380px;
  margin: 0;
}
.highlight-cyan {
  color: #00E6F6;
  font-weight: 700;
  text-shadow: 0 0 8px rgba(0, 230, 246, 0.3);
}
.warning-text-container {
  background: rgba(244, 63, 94, 0.06);
  border: 1px dashed rgba(244, 63, 94, 0.22);
  border-radius: 12px;
  padding: 10px 16px;
  width: 100%;
}
.warning-alert-text {
  color: #f43f5e;
  font-size: 0.85rem;
  font-weight: 600;
  line-height: 1.45;
  margin: 0;
  text-align: center;
}
.modal-actions {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  width: 100%;
}
.improve-score-grad-btn {
  background: linear-gradient(90deg, #00D6F6 0%, #8B5CF6 100%);
  color: #0b0f19 !important;
  font: 900 0.9rem var(--font-h) !important;
  border: none;
  border-radius: 50px;
  padding: 12px 32px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  width: 100%;
  box-shadow: 
    0 4px 15px rgba(0, 230, 246, 0.35), 
    inset 0 1px 2px rgba(255, 255, 255, 0.4);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}
.improve-score-grad-btn:hover {
  transform: scale(1.03);
  box-shadow: 
    0 6px 25px rgba(0, 230, 246, 0.6), 
    0 0 15px rgba(139, 92, 246, 0.3),
    inset 0 1px 2px rgba(255, 255, 255, 0.5);
  background: linear-gradient(90deg, #00f5ff 0%, #a855f7 100%);
}
.improve-score-grad-btn:active {
  transform: scale(0.98);
}
.play-icon-svg {
  width: 14px;
  height: 14px;
  fill: #0b0f19;
  stroke: #0b0f19;
  stroke-width: 2.5;
  stroke-linejoin: round;
}
.modal-close-cancel-btn {
  background: none;
  border: none;
  color: #64748b;
  font: 600 0.85rem var(--font-h);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  cursor: pointer;
  transition: color 0.2s;
  padding: 6px 12px;
}
.modal-close-cancel-btn:hover {
  color: #cbd5e1;
}

/* Notebook Locked State Settings */
body.notebook-locked {
  /* No full blur or scroll lock on page load, let student read theory and see cells! */
}

/* Modal Open blur effects */
body.modal-open #notebook,
body.modal-open header,
body.modal-open nav {
  filter: blur(8px) grayscale(20%);
  pointer-events: none !important;
  transition: filter 0.3s ease;
}