:root{--bg-primary: #0a0e17;--bg-surface: #141c2b;--bg-surface-elevated: #1e293b;--bg-glass: rgba(20, 28, 43, .85);--border-subtle: #2d3b53;--border-strong: #475569;--text-main: #f8fafc;--text-muted: #94a3b8;--text-highlight: #38bdf8;--accent-cyan: #0ea5e9;--accent-amber: #f59e0b;--accent-emerald: #10b981;--accent-rose: #f43f5e;--accent-purple: #a855f7;--font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;--font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;--btn-height: 56px;--border-radius: 12px}*{box-sizing:border-box;margin:0;padding:0;-webkit-font-smoothing:antialiased}body,html{width:100%;height:100%;overflow:hidden;background-color:var(--bg-primary);color:var(--text-main);font-family:var(--font-sans);font-size:18px;line-height:1.5}#app{display:flex;flex-direction:column;width:100vw;height:100vh;position:relative}.lab-header{display:flex;align-items:center;justify-content:space-between;height:72px;padding:0 24px;background:var(--bg-surface);border-bottom:2px solid var(--border-subtle);z-index:10}.lab-title-group{display:flex;align-items:center;gap:16px}.lab-badge{background:linear-gradient(135deg,#0284c7,#2563eb);color:#fff;font-weight:800;font-size:20px;padding:6px 14px;border-radius:8px;letter-spacing:.5px}.lab-title{font-size:22px;font-weight:700;color:var(--text-main)}.lab-subtitle{font-size:15px;color:var(--text-muted);font-weight:500}.mode-selector{display:flex;background:var(--bg-primary);padding:4px;border-radius:var(--border-radius);border:1px solid var(--border-subtle)}.mode-btn{background:transparent;color:var(--text-muted);border:none;font-size:17px;font-weight:600;padding:10px 22px;border-radius:8px;cursor:pointer;transition:all .2s ease;min-height:48px}.mode-btn:hover{color:var(--text-main)}.mode-btn.active{background:var(--accent-cyan);color:#fff;box-shadow:0 2px 8px #0ea5e966}.lab-workspace{display:flex;flex:1;position:relative;overflow:hidden}#canvas-container{flex:1;height:100%;position:relative;cursor:grab}#canvas-container:active{cursor:grabbing}.meniscus-magnifier{position:absolute;top:24px;left:24px;width:250px;height:290px;background:var(--bg-glass);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border:2px solid var(--accent-cyan);border-radius:var(--border-radius);box-shadow:0 12px 32px #0009;display:flex;flex-direction:column;overflow:hidden;z-index:5;transition:transform .3s ease,opacity .3s ease}.magnifier-header{padding:8px 14px;background:#0ea5e933;border-bottom:1px solid var(--accent-cyan);font-size:15px;font-weight:700;color:var(--accent-cyan);display:flex;justify-content:space-between;align-items:center}.magnifier-viewport{flex:1;position:relative;overflow:hidden;background:#030712}.meniscus-sight-line{position:absolute;top:50%;left:0;width:100%;height:2px;background:#ef4444;box-shadow:0 0 6px #ef4444;pointer-events:none;z-index:2}.meniscus-reading-badge{position:absolute;bottom:8px;left:50%;transform:translate(-50%);background:#0f172a;color:#38bdf8;font-family:var(--font-mono);font-weight:700;font-size:20px;padding:4px 14px;border-radius:6px;border:1px solid #38bdf8;z-index:3}.solution-indicator-card{position:absolute;bottom:24px;left:24px;background:var(--bg-glass);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border:1px solid var(--border-strong);border-radius:var(--border-radius);padding:14px 20px;display:flex;align-items:center;gap:16px;box-shadow:0 8px 24px #00000080;z-index:5}.indicator-color-dot{width:32px;height:32px;border-radius:50%;border:2px solid #ffffff;box-shadow:0 0 12px currentColor;transition:background-color .3s ease}.solution-meta-text{display:flex;flex-direction:column}.solution-status-label{font-size:14px;color:var(--text-muted);text-transform:uppercase;font-weight:700;letter-spacing:.5px}.solution-name{font-size:19px;font-weight:700;color:var(--text-main)}.lab-sidebar{width:480px;height:100%;background:var(--bg-surface);border-left:2px solid var(--border-subtle);display:flex;flex-direction:column;z-index:5;overflow-y:auto}.sidebar-section{padding:20px;border-bottom:1px solid var(--border-subtle)}.section-heading{font-size:17px;font-weight:700;text-transform:uppercase;letter-spacing:.8px;color:var(--text-highlight);margin-bottom:14px;display:flex;align-items:center;justify-content:space-between}.btn-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}.btn-deck{height:var(--btn-height);border-radius:var(--border-radius);font-size:18px;font-weight:700;border:none;cursor:pointer;display:flex;align-items:center;justify-content:center;gap:10px;transition:all .2s cubic-bezier(.4,0,.2,1);-webkit-user-select:none;user-select:none}.btn-deck:active{transform:scale(.97)}.btn-primary{background:var(--accent-cyan);color:#fff;box-shadow:0 4px 14px #0ea5e959}.btn-primary:hover{background:#0284c7}.btn-tap-open{background:var(--accent-rose);color:#fff;box-shadow:0 4px 14px #f43f5e59;animation:pulse-border 1.5s infinite}.btn-secondary{background:var(--bg-surface-elevated);color:var(--text-main);border:1px solid var(--border-strong)}.btn-secondary:hover{background:#334155;border-color:var(--text-highlight)}.btn-amber{background:var(--accent-amber);color:#1e1b4b}.btn-amber:hover{background:#d97706}.btn-full{grid-column:span 2}@keyframes pulse-border{0%,to{box-shadow:0 0 #f43f5e99}50%{box-shadow:0 0 0 8px #f43f5e00}}.drip-rate-bar{display:flex;background:var(--bg-primary);border-radius:var(--border-radius);border:1px solid var(--border-subtle);padding:4px;margin-top:10px}.drip-option{flex:1;text-align:center;padding:10px 4px;font-size:15px;font-weight:700;color:var(--text-muted);cursor:pointer;border-radius:8px;transition:all .2s ease}.drip-option:hover{color:var(--text-main)}.drip-option.active{background:#334155;color:var(--text-highlight)}.guide-steps-list{display:flex;flex-direction:column;gap:12px}.guide-step-item{display:flex;align-items:flex-start;gap:14px;padding:12px 14px;background:var(--bg-surface-elevated);border-radius:var(--border-radius);border-left:4px solid var(--border-subtle);font-size:16px;transition:all .2s ease}.guide-step-item.active{border-left-color:var(--accent-cyan);background:#0ea5e91a}.guide-step-item.completed{border-left-color:var(--accent-emerald);opacity:.75}.step-num-badge{width:28px;height:28px;border-radius:50%;background:var(--bg-primary);color:var(--text-highlight);font-weight:800;font-size:15px;display:flex;align-items:center;justify-content:center;flex-shrink:0}.guide-step-item.completed .step-num-badge{background:var(--accent-emerald);color:#fff}.results-table-container{overflow-x:auto}.waec-table{width:100%;border-collapse:collapse;font-size:16px;text-align:center;background:var(--bg-surface-elevated);border-radius:8px;overflow:hidden}.waec-table th,.waec-table td{padding:10px 8px;border:1px solid var(--border-subtle)}.waec-table th{background:#1e293b;color:var(--text-highlight);font-weight:700;font-size:15px}.table-input{width:80px;padding:6px 4px;background:#0f172a;color:#fff;border:1px solid var(--border-strong);border-radius:6px;font-family:var(--font-mono);font-size:16px;text-align:center}.table-input:focus{outline:none;border-color:var(--accent-cyan);box-shadow:0 0 6px var(--accent-cyan)}.concordant-indicator{display:flex;align-items:center;justify-content:space-between;margin-top:12px;padding:10px 14px;background:var(--bg-primary);border-radius:8px;font-size:16px}.concordant-tag{font-weight:800;padding:4px 10px;border-radius:6px;font-size:14px}.concordant-tag.valid{background:#10b98133;color:#34d399;border:1px solid #10b981}.concordant-tag.invalid{background:#f43f5e33;color:#fb7185;border:1px solid #f43f5e}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#0a0e17d9;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);display:flex;align-items:center;justify-content:center;z-index:100;padding:24px}.modal-card{background:var(--bg-surface);border:2px solid var(--accent-cyan);border-radius:16px;width:100%;max-width:680px;padding:32px;box-shadow:0 24px 64px #000c;display:flex;flex-direction:column;gap:20px}.modal-header{display:flex;justify-content:space-between;align-items:center}.modal-title{font-size:26px;font-weight:800;color:var(--text-main)}.marking-score-badge{font-size:28px;font-weight:800;color:var(--accent-amber);background:#f59e0b26;padding:6px 16px;border-radius:8px;border:1px solid var(--accent-amber)}.marking-breakdown-list{display:flex;flex-direction:column;gap:10px}.breakdown-row{display:flex;justify-content:space-between;padding:10px 14px;background:var(--bg-surface-elevated);border-radius:8px;font-size:16px}.breakdown-row.earned{border-left:4px solid var(--accent-emerald)}.breakdown-row.missed{border-left:4px solid var(--accent-rose);opacity:.85}.keyboard-bar{display:flex;align-items:center;gap:18px;padding:8px 24px;background:#0f172a;border-top:1px solid var(--border-subtle);font-size:14px;color:var(--text-muted)}.key-badge{background:#1e293b;color:#38bdf8;font-family:var(--font-mono);font-weight:700;padding:2px 8px;border-radius:4px;border:1px solid #334155}.canvas-host{position:absolute;top:0;right:0;bottom:0;left:0}.home{height:100%;display:flex;flex-direction:column;background:radial-gradient(1200px 600px at 70% -10%,#16324a 0%,transparent 60%),var(--bg-primary)}.home-header{display:flex;align-items:center;justify-content:space-between;gap:24px;padding:28px 40px 18px}.home-brand{display:flex;align-items:center;gap:18px}.home-title{font-size:30px;line-height:1.15;letter-spacing:-.3px}.home-sub{color:var(--text-muted);font-size:17px;margin-top:4px}.offline-pill{display:flex;align-items:center;gap:10px;border:2px solid #1f6f4a;background:#0c2a1e;color:#86efac;font-weight:700;font-size:16px;padding:10px 16px;border-radius:999px}.offline-dot{width:10px;height:10px;border-radius:50%;background:#34d399}.subject-tabs{display:flex;gap:12px;padding:10px 40px 0;border-bottom:2px solid var(--border-subtle)}.subject-tab{background:transparent;color:var(--text-muted);border:none;border-bottom:4px solid transparent;font:inherit;font-size:20px;font-weight:700;padding:14px 22px;cursor:pointer;min-height:56px}.subject-tab:hover{color:var(--text-main)}.subject-tab.active{color:var(--text-main);border-bottom-color:var(--accent-cyan)}.home-main{flex:1;overflow-y:auto;padding:22px 40px 32px}.home-intro{color:var(--text-muted);font-size:18px;margin-bottom:20px;max-width:900px}.card-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(330px,1fr));gap:18px}.exp-card{text-align:left;font:inherit;color:inherit;background:var(--bg-surface);border:2px solid var(--border-subtle);border-left:6px solid var(--accent-cyan);border-radius:var(--border-radius);padding:20px 20px 16px;display:flex;flex-direction:column;gap:8px;cursor:pointer;min-height:220px;transition:transform .15s ease,border-color .15s ease,background .15s ease}.exp-card:hover,.exp-card:focus-visible{transform:translateY(-3px);border-color:var(--accent-cyan);background:var(--bg-surface-elevated);outline:none}.exp-card.unavailable{border-left-color:#334155;opacity:.62;cursor:default}.exp-card.unavailable:hover{transform:none;border-color:var(--border-subtle);background:var(--bg-surface)}.exp-card-top{display:flex;justify-content:space-between;align-items:center}.exp-paper{font-size:14px;font-weight:700;color:var(--text-highlight);letter-spacing:.4px;text-transform:uppercase}.exp-state{font-size:13px;font-weight:700;color:var(--text-muted);border:1px solid var(--border-strong);padding:3px 8px;border-radius:999px}.exp-title{font-size:23px;line-height:1.2}.exp-topic{color:var(--accent-amber);font-weight:700;font-size:16px}.exp-summary{color:var(--text-muted);font-size:16px;line-height:1.45;flex:1}.exp-cta{color:var(--text-highlight);font-weight:800;font-size:17px}.home-foot{color:#64748b;font-size:15px;margin-top:26px}kbd{font-family:var(--font-mono);font-size:13px;border:1px solid var(--border-strong);border-bottom-width:3px;border-radius:5px;padding:1px 6px;color:var(--text-main)}.btn-back{background:var(--bg-primary);color:var(--text-main);border:2px solid var(--border-strong);border-radius:8px;font:inherit;font-size:16px;font-weight:700;padding:8px 14px;min-height:46px;cursor:pointer}.btn-back:hover{border-color:var(--accent-cyan);color:var(--text-highlight)}.loading-screen{height:100%;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:14px;color:var(--text-muted)}.loading-screen .loading-badge{font-size:30px;font-weight:800;color:var(--text-main)}.error-detail{font-family:var(--font-mono);font-size:14px;color:var(--accent-rose);max-width:80ch}@media(max-width:1500px){.mode-btn{font-size:15px;padding:10px 12px}.lab-title{font-size:19px}.lab-subtitle{font-size:13px}.lab-sidebar{width:430px}.lab-header{gap:10px;padding:0 14px}}@media(max-width:1100px){.lab-sidebar{width:360px}.lab-badge{display:none}.home-title{font-size:24px}}.sample-grid{grid-template-columns:repeat(4,1fr)}.reagent-grid{grid-template-columns:1fr 1fr}.sample-btn{font-size:22px;font-weight:800}.sample-btn.active{border-color:var(--accent-cyan);background:#0b3a52;color:#e0f2fe}.hint-box{margin-top:12px;padding:10px 12px;font-size:15px;border-left:4px solid var(--accent-amber);background:#1b1608;color:#fde68a;border-radius:6px}.compact-table{font-size:14px}.compact-table th,.compact-table td{padding:6px}.empty-row{color:var(--text-muted);font-style:italic;text-align:center}.answer-row{display:flex;align-items:center;justify-content:space-between;gap:10px;margin:8px 0;font-size:16px}.answer-row select{background:var(--bg-primary);color:var(--text-main);border:2px solid var(--border-strong);border-radius:8px;padding:8px 10px;font:inherit;font-size:15px;min-height:44px;min-width:210px}.guide-steps-list.compact .guide-step-item{padding:8px 10px;font-size:14px}.stopwatch-card{position:absolute;top:20px;left:20px;background:#0a0e17e0;border:2px solid var(--border-strong);border-radius:12px;padding:12px 18px;min-width:250px}.stopwatch-label{font-size:13px;letter-spacing:1px;color:var(--text-muted);font-weight:700}.stopwatch-value{font-family:var(--font-mono);font-size:40px;font-weight:800;color:#fbbf24;line-height:1.15}.stopwatch-sub{font-family:var(--font-mono);font-size:16px;color:var(--text-highlight)}.big-slider{width:100%;height:34px;accent-color:#0ea5e9;cursor:pointer}.range-scale{display:flex;justify-content:space-between;color:var(--text-muted);font-size:13px;font-family:var(--font-mono)}.graph-canvas{width:100%;height:auto;display:block;border:2px solid var(--border-subtle);border-radius:8px;background:#0a0e17}.readout-row{display:flex;justify-content:space-between;gap:10px;margin-top:10px;font-size:15px;color:var(--text-muted)}.readout-row strong{color:var(--text-main);font-family:var(--font-mono)}.lab-root{display:flex;flex-direction:column;width:100%;height:100%}.home{width:100%}.lab-sidebar{flex-shrink:0}#canvas-container canvas{display:block;width:100%!important;height:100%!important}