:root{--teal:#0f7e9b;--teal-dark:#095f76;--teal-light:#eaf4f7;--teal-border:#a9c4cf;--amber:#d67b19;--amber-dark:#b06210;--amber-light:#fdf3e8;--amber-border:#f2cca1;--ink:#123140;--body:#4b6570;--border:#c8dbe3;--border-light:#e2eef3;--surface:#fff;--surface-alt:#f7fbfd;--surface-2:#f0f8fb;--white:#fff;--good:#1a7f4e;--warn-bg:#fdf3e7;--shadow-sm:0 2px 6px #0c36440d;--shadow:0 4px 16px #0c364414;--shadow-lg:0 12px 28px #0c36441f;--app-bg:radial-gradient(1200px 700px at 8% 2%, #0f7e9b1f, transparent 62%), radial-gradient(900px 600px at 92% 98%, #d67b191a, transparent 66%), linear-gradient(165deg, #eef5f9, #fff9f1);--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light}*{box-sizing:border-box}html{--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light;background:#fff;min-height:100%}body{background:var(--app-bg);min-height:100%;color:var(--body);-webkit-font-smoothing:antialiased;margin:0;font-family:Inter,IBM Plex 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.75rem;font-size:.75rem;font-weight:700;display:inline-flex}.mode-badge{color:var(--teal-dark);background:var(--teal-light);border:1px solid var(--teal-border);border-radius:6px;align-items:center;gap:.35rem;padding:.25rem .75rem;font-size:.75rem;font-weight:700;display:inline-flex}.hero-meta-badges{flex-wrap:wrap;align-items:center;gap:.6rem;display:flex}.meta-badge{border:1px solid var(--border);color:var(--body);box-shadow:var(--shadow-sm);background:#fff;border-radius:20px;align-items:center;gap:.4rem;padding:.3rem .85rem;font-size:.82rem;font-weight:500;display:inline-flex}.hero-subtitle{color:var(--body);max-width:85ch;margin:.35rem 0 0;font-size:.95rem;line-height:1.5}.btn{border:1.5px solid var(--border);background:var(--white);min-height:42px;color:var(--teal-dark);cursor:pointer;border-radius:9px;justify-content:center;align-items:center;gap:6px;padding:7px 16px;font-size:15px;font-weight:600;text-decoration:none;transition:all 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var(--border);box-shadow:var(--shadow-sm);scrollbar-width:thin;background:#fffffff5;border-radius:12px;gap:.45rem;margin-bottom:1.25rem;padding:.4rem;display:flex;overflow-x:auto}.step{min-width:160px;min-height:44px;color:var(--body);cursor:pointer;text-align:center;background:0 0;border:1px solid #0000;border-radius:8px;flex:1;justify-content:center;align-items:center;gap:8px;padding:.6rem .9rem;font-size:.92rem;font-weight:600;transition:all .2s;display:inline-flex}.step:hover:not(:disabled){background:var(--teal-light);color:var(--teal-dark)}.step .num{background:var(--surface-2);width:24px;height:24px;color:var(--teal-dark);border-radius:50%;justify-content:center;align-items:center;font-size:13px;font-weight:700;transition:all .2s;display:inline-flex}.step.on{background:var(--teal);color:#fff;border-color:var(--teal-dark);box-shadow:0 2px 8px #0f7e9b40}.step.on .num{color:var(--teal);background:#fff}.step:disabled{opacity:.45;cursor:not-allowed}.table-wrap{margin:8px 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tr.live{background:var(--warn-bg)}.data-table tr:hover:not(.live){background:#fafcfe}.empty{text-align:center;color:var(--body);padding:22px}.num-input{border:1.5px solid var(--border);width:120px;min-height:40px;color:var(--ink);font-variant-numeric:tabular-nums;border-radius:8px;padding:6px 10px;font:600 16px IBM Plex Sans,monospace;transition:border-color .2s}.num-input:focus{border-color:var(--teal);outline:2px solid var(--amber);outline-offset:1px}.num-input.invalid{border-color:var(--amber);background:var(--warn-bg)}.field-msg{color:var(--amber-dark);margin-top:3px;font-size:13px;font-weight:500}.beam-dot{border:2px solid var(--border);vertical-align:-1px;background:#fff;border-radius:50%;width:13px;height:13px;margin-right:8px;transition:all .2s;display:inline-block}.beam-dot.done{background:var(--teal);border-color:var(--teal)}.beam-dot.on{background:var(--amber);border-color:var(--amber);box-shadow:0 0 0 4px #d67b194d}.point-badge{background:var(--teal-light);border:1px solid 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0}.btn-ghost:hover:not(:disabled){border-color:var(--amber);color:var(--amber-dark);background:var(--warn-bg)}.status-line{min-height:1.5em;color:var(--ink);margin:10px 0 6px;font-weight:500}.actions{flex-wrap:wrap;align-items:center;gap:10px;margin:12px 0;display:flex}.next-row{border-top:1px solid var(--border-light);flex-wrap:wrap;align-items:center;gap:14px;margin-top:16px;padding-top:14px;display:flex}.armed-note{color:var(--amber-dark);align-self:center;font-weight:600}.hint{color:var(--body);margin:6px 0;font-size:14px;line-height:1.45}.think{background:var(--teal-light);border-left:5px solid var(--teal);border-radius:0 10px 10px 0;margin:0 0 14px;padding:12px 16px;font-size:14.5px}.think ul{margin:6px 0 0;padding-left:20px}.callout{background:var(--surface-alt);border:1px solid var(--border);border-left:5px solid var(--teal);border-radius:10px;margin:12px 0;padding:12px 16px;font-size:14.5px;line-height:1.5}.callout p{margin:0}.callout.warn{background:var(--warn-bg);border-color:var(--amber-border);border-left:5px solid var(--amber)}.callout.good{background:#edf8f2;border-color:#a7f3d0 #a7f3d0 #a7f3d0 #1a7f4e;border-left-style:solid;border-left-width:5px}.eq-box{border:1px solid var(--border);background:var(--white);box-shadow:var(--shadow-sm);border-radius:12px;margin:12px 0;padding:14px 18px}.eq-box.teal{background:var(--surface-alt);border-color:var(--teal-border);border-left:5px solid var(--teal)}.eq-title{text-transform:uppercase;letter-spacing:.06em;color:var(--teal-dark);margin-bottom:6px;font:700 12px Inter,sans-serif}.eq{color:var(--ink);font-size:18px}.eq.big{color:var(--teal-dark);margin:4px 0 10px;font-size:20px;font-weight:600}.coef-row{color:var(--ink);font-variant-numeric:tabular-nums;flex-wrap:wrap;gap:6px 22px;font-size:15px;display:flex}.meaning{color:var(--ink);margin:6px 0}.meaning-list{color:var(--ink);margin:6px 0;padding-left:20px}.meaning-list li{margin:4px 0}.result{color:var(--teal-dark);font-family:Inter,sans-serif;font-size:1.08em;font-weight:700}.reveal{border:1px solid var(--border);background:#fff;border-radius:10px;margin:12px 0;padding:8px 14px}.reveal summary{cursor:pointer;color:var(--teal-dark);align-items:center;min-height:44px;font:600 15px Inter,sans-serif;display:flex}.toggle{align-items:flex-start;gap:10px;min-height:44px;margin-top:10px;font-size:15px;display:flex}.toggle input{width:22px;height:22px;accent-color:var(--teal);margin-top:2px}.controls{margin-top:8px}.slider-label{color:var(--ink);margin:8px 0 2px;font-size:17px;display:block}.slider-row{align-items:center;gap:8px;display:flex}.slider-row input[type=range]{height:44px;accent-color:var(--amber);flex:1}.readout-row{color:var(--ink);flex-wrap:wrap;align-items:center;gap:8px 22px;margin:4px 0 2px;font-size:17px;display:flex}.readout{color:var(--ink);margin:8px 0 10px;font-size:17px}.mini-table{flex-wrap:wrap;align-items:center;gap:8px;margin:8px 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var(--border-light);color:var(--body);text-align:center;flex-wrap:wrap;justify-content:center;align-items:center;gap:.75rem;margin-top:2.5rem;padding-top:1.25rem;font-size:.85rem;display:flex}@media (width<=960px){.step-grid,.collect-grid.with-stand{grid-template-columns:minmax(0,1fr)}.graph-card{position:static}.shell{width:calc(100% - 1.5rem);padding-top:.5rem}}@media print{.stepper,.actions,.next-row,.brand,.bg-grid,.btn{display:none!important}.card{box-shadow:none!important;border:1px solid #ccc!important}body{background:#fff!important}}.diag{white-space:pre-wrap;color:var(--ink);background:var(--surface-2);-webkit-user-select:text;user-select:text;border:1px solid var(--border-light);border-radius:8px;margin:0 0 8px;padding:10px 12px;font:13px/1.5 ui-monospace,Menlo,monospace}.beam-times{color:var(--body);font-variant-numeric:tabular-nums;font:400 12px IBM Plex Sans,sans-serif}.saved-box{border-top:1px dashed var(--border);margin-top:14px;padding-top:12px}.data-table.compact{font-size:13.5px}.data-table.compact th,.data-table.compact td{padding:6px 10px}.sigma{color:var(--body);font-size:.9em;font-weight:500}.slope-box{background:var(--white);border:1.5px solid var(--amber);box-shadow:var(--shadow-sm);border-radius:10px;margin:10px 0;padding:10px 14px}.unit{color:var(--body);font-size:.8em}.steps-list{padding-left:22px}.steps-list li{margin:12px 0}.teacher-form{text-align:left;flex-wrap:wrap;align-items:center;gap:8px;display:inline-flex}.teacher-form input{border:1.5px solid var(--border);min-height:38px;font:inherit;border-radius:8px;padding:0 10px}