:root{--ink:#0b0a08;--ink-raised:#18140e;--ink-line:#2a2419;--ink-text:#f2ead9;--ink-muted:#8f8674;--ink-faint:#524b3c;--paper:#f4ead2;--paper-raised:#fffaf0;--paper-line:#e3d4ae;--paper-text:#221a10;--paper-muted:#5f5540;--gold:#c9a13a;--gold-2:#efc86b;--gold-solid:#c9a13a;--ember:#b8431c;--ember-2:#f08a52;--moss:#7f9863;--constellation-dot:#f2ead947;--scrim:#0000008c;--ink-solid:#0b0a08;--paper-solid:#f2ead9;--card-ink-raised:#fffaf0;--card-ink-line:#e6dcc4;--card-ink-text:#221a10;--card-ink-muted:#5f5540;--card-gold-2:#7d5a0f;--card-ember-2:#9c3a17;--stat-tile-bg:var(--card-ink-raised);--stat-tile-fg:var(--card-ink-text);--stat-tile-fg-muted:var(--card-ink-muted);--stat-tile-accent:var(--card-gold-2);--stat-tile-ring-track:#221a1024;--stat-tile-ring:#4f6b3a;--pyq-bg:#ece0c0;--radius-card:20px;--radius-chip:8px;--radius-pill:999px;--ease:cubic-bezier(.22,.68,.16,1);--dur-s:.22s;--dur-m:.48s;--dur-l:.78s;--font-display:"Fraunces", Georgia, "Times New Roman", serif;--font-ui:"Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;--font-tamil:"Noto Sans Tamil", "Inter", sans-serif;--font-mono:"JetBrains Mono", ui-monospace, "SFMono-Regular", monospace}:root[data-theme=light]{--ink:#f7f1e4;--ink-raised:#fff;--ink-line:#e2d9c4;--ink-text:#241c10;--ink-muted:#5c513d;--ink-faint:#a89b80;--paper:#fff;--paper-raised:#fbf7ee;--paper-line:#e6dcc4;--paper-text:#221a10;--paper-muted:#5c513d;--gold:#8a6412;--gold-2:#7d5a0f;--ember:#b8431c;--ember-2:#9c3a17;--moss:#4f6b3a;--constellation-dot:#5a4a2a4d;--scrim:#14100859;--pyq-bg:#f2ecd9;--card-ink-raised:#fffefb;--stat-tile-bg:var(--ink-solid);--stat-tile-fg:var(--paper-solid);--stat-tile-fg-muted:#f2ead999;--stat-tile-accent:#efc86b;--stat-tile-ring-track:#ffffff24;--stat-tile-ring:#7f9863}[lang=ta],.lang-ta{font-family:var(--font-tamil)}*{box-sizing:border-box}html{-webkit-text-size-adjust:100%}body{background:var(--ink);color:var(--ink-text);font-family:var(--font-ui);min-height:100dvh;transition:background var(--dur-m) var(--ease), color var(--dur-m) var(--ease);margin:0;overflow-x:hidden}@media (prefers-reduced-motion:reduce){*,:before,:after{scroll-behavior:auto!important;transition-duration:.001ms!important;animation-duration:.001ms!important;animation-iteration-count:1!important}}a{color:inherit}button{font-family:inherit}h1,h2,h3,h4{text-wrap:balance;margin:0}::selection{background:var(--gold-solid);color:var(--ink-solid)}:focus-visible{outline:2px solid var(--gold-2);outline-offset:2px;border-radius:4px}.app{max-width:1180px;margin:0 auto;padding:0 24px 64px;position:relative}.bg-field{z-index:0;pointer-events:none;background:radial-gradient(1100px 620px at 82% -8%, #c9a13a1a, transparent 60%), radial-gradient(900px 500px at -10% 40%, #d85b2a0f, transparent 55%), var(--ink);background-size:160% 160%,160% 160%;animation:26s ease-in-out infinite bg-drift;position:fixed;inset:0}@keyframes bg-drift{0%,to{background-position:0 0,0 0}50%{background-position:10% 6%,-8% -6%}}.grain{z-index:0;pointer-events:none;opacity:.035;mix-blend-mode:overlay;background-image:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='120' height='120'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/></filter><rect width='100%25' height='100%25' filter='url(%23n)'/></svg>");position:fixed;inset:0}header.top{z-index:40;background:linear-gradient(var(--ink) 60%, transparent);-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);justify-content:space-between;align-items:center;gap:16px;width:100%;max-width:1180px;margin:0 auto;padding:20px 24px;display:flex;position:sticky;top:0}.chapter-progress-track{background:var(--ink-line);height:3px;position:absolute;bottom:0;left:0;right:0;overflow:hidden}.chapter-progress-track span{background:linear-gradient(90deg,var(--moss),var(--gold));height:100%;transition:width var(--dur-l) var(--ease);border-radius:0 3px 3px 0;display:block}.wordmark{font-family:var(--font-ui);letter-spacing:.14em;color:var(--gold-2);cursor:pointer;background:0 0;border:none;align-items:baseline;gap:10px;font-size:13px;font-weight:700;text-decoration:none;display:flex}.wordmark .dot{color:var(--ember-2)}.header-actions{align-items:center;gap:8px;display:flex;position:relative}.cadence-line{color:var(--ink-muted);font-size:11.5px;font-family:var(--font-mono);letter-spacing:.02em;align-items:center;gap:8px;margin:16px 0 26px;display:flex}.cadence-line b{color:var(--ink-muted);font-weight:600}.cadence-line .sep{opacity:.5}.icon{stroke:currentColor;fill:none;stroke-width:2px;stroke-linecap:round;stroke-linejoin:round;flex:none;width:17px;height:17px;display:block}.icon-btn{border:1px solid var(--ink-line);background:var(--ink-raised);width:38px;height:38px;color:var(--ink-text);cursor:pointer;transition:transform var(--dur-s) var(--ease), border-color var(--dur-s) var(--ease), box-shadow var(--dur-s) var(--ease), background var(--dur-s) var(--ease), color var(--dur-s) var(--ease);border-radius:50%;justify-content:center;align-items:center;padding:0;font-size:14px;display:flex}.icon-btn:hover{border-color:var(--gold);transform:translateY(-2px);box-shadow:0 6px 18px #c9a13a2e}.seg-switch{background:var(--ink-raised);border:1px solid var(--ink-line);border-radius:var(--radius-pill);align-items:center;gap:2px;padding:3px;display:flex}.seg-switch button{cursor:pointer;font-family:var(--font-ui);letter-spacing:.02em;color:var(--ink-muted);border-radius:var(--radius-pill);min-width:24px;min-height:24px;transition:background var(--dur-s) var(--ease), color var(--dur-s) var(--ease);background:0 0;border:none;padding:7px 11px;font-size:11.5px;font-weight:700}.seg-switch button[aria-pressed=true]{background:var(--gold-solid);color:var(--ink-solid)}.streak-chip{font-family:var(--font-mono);color:var(--ember-2);background:var(--ink-raised);border:1px solid var(--ink-line);cursor:pointer;border-radius:var(--radius-pill);transition:transform var(--dur-s) var(--ease), border-color var(--dur-s) var(--ease);align-items:center;gap:6px;padding:8px 12px;font-size:12px;font-weight:600;display:flex}.streak-chip:hover{border-color:var(--ember);transform:translateY(-2px)}.streak-chip .icon{stroke:none;fill:currentColor;width:15px;height:15px}body.is-login .header-actions .streak-chip,body.is-login .header-actions>.icon-btn{display:none}.popover{z-index:60;background:var(--ink-raised);border:1px solid var(--ink-line);width:230px;color:var(--ink-muted);border-radius:14px;padding:16px 18px;font-size:12.5px;line-height:1.5;position:absolute;top:calc(100% + 10px);right:0;box-shadow:0 20px 44px #00000073}.popover[hidden]{display:none}.popover strong{color:var(--ink-text);font-family:var(--font-display);margin-bottom:4px;font-size:16px;display:block}.menu-popover{width:250px}.popover-row{justify-content:space-between;align-items:center;gap:12px;margin-bottom:2px;display:flex}.popover-divider{background:var(--ink-line);height:1px;margin:14px 0}.popover-account{color:var(--ink-text);margin-bottom:2px;font-size:13px}.menu-lang-row{display:none}.popover.popover-mobile{width:auto;position:fixed;inset:auto 16px 16px}.screen{z-index:1;display:none;position:relative}.screen.active{display:block}@keyframes rise-in{0%{opacity:0;transform:translateY(14px)}to{opacity:1;transform:translateY(0)}}.screen.active .stagger{animation:rise-in var(--dur-m) var(--ease) both}.screen.active .stagger:first-child{animation-delay:0s}.screen.active .stagger:nth-child(2){animation-delay:70ms}.screen.active .stagger:nth-child(3){animation-delay:.14s}.screen.active .stagger:nth-child(4){animation-delay:.21s}.screen.active .stagger:nth-child(5){animation-delay:.28s}.home-grid{grid-template-columns:1.1fr .9fr;align-items:center;gap:48px;min-height:min(72vh,640px);padding-top:24px;display:grid}.home-grid>*,.learn-shell>*{min-width:0}.hero-name{overflow-wrap:break-word}.brain-col{perspective:800px}.brain-wrap{aspect-ratio:1;cursor:pointer;max-width:460px;transition:transform var(--dur-s) var(--ease);border-radius:28px;margin:0 auto;position:relative}.brain-wrap:hover{transform:scale(1.015)}.brain-wrap:focus-visible{outline:2px solid var(--gold-2);outline-offset:8px}.brain-caption{text-align:center;color:var(--ink-muted);font-size:11.5px;font-style:italic;font-family:var(--font-display);margin:14px 0 0}.eyebrow{font-family:var(--font-ui);letter-spacing:.18em;text-transform:uppercase;color:var(--ink-muted);margin:0 0 10px;font-size:12px;font-weight:700}.hero-name{font-family:var(--font-display);font-variation-settings:"SOFT" 40;color:var(--ink-text);letter-spacing:-.01em;font-size:clamp(40px,6vw,72px);font-weight:420;line-height:1.02}.hero-name .full-stop{color:var(--gold-2)}.hero-rule{background:var(--gold);opacity:.7;border:none;width:56px;height:2px;margin:22px 0}.card-dark,.resume-card,.unit-card{--ink-raised:var(--card-ink-raised);--ink-line:var(--card-ink-line);--ink-text:var(--card-ink-text);--ink-muted:var(--card-ink-muted);--gold-2:var(--card-gold-2);--ember-2:var(--card-ember-2)}.card-dark{background:var(--ink-raised);border:1px solid var(--ink-line);border-radius:var(--radius-card);transition:border-color var(--dur-s) var(--ease), transform var(--dur-s) var(--ease);margin-bottom:14px;padding:20px 22px;position:relative;overflow:hidden;box-shadow:0 10px 28px #00000047}.card-dark:before{content:"";opacity:0;transition:opacity var(--dur-m) var(--ease);background:radial-gradient(160px 120px at 12% 0,#c9a13a29,#0000 70%);position:absolute;inset:0}.card-dark:hover{border-color:var(--ink-line);transform:translateY(-2px)}.card-dark:hover:before{opacity:1}.resume-card{text-align:left;border:1px solid var(--ink-line);cursor:pointer;background:var(--ink-raised);border-radius:var(--radius-card);width:100%;transition:transform var(--dur-s) var(--ease), border-color var(--dur-s) var(--ease), box-shadow var(--dur-s) var(--ease);margin-bottom:14px;padding:24px 26px 26px;font-family:inherit;display:block;position:relative;overflow:hidden}.resume-card:before{content:"";opacity:0;transition:opacity var(--dur-m) var(--ease);background:radial-gradient(240px 170px at 8% 0,#c9a13a38,#0000 70%);position:absolute;inset:0}.resume-card:hover{border-color:var(--gold);transform:translateY(-3px);box-shadow:0 18px 44px #0006}.resume-card:hover:before{opacity:1}.resume-card .cta-pill{pointer-events:none;margin-top:18px}.guide-note{padding:16px 20px}.guide-note .card-quote{font-size:13.5px}.card-label{letter-spacing:.14em;text-transform:uppercase;margin-bottom:6px;font-size:11px;font-weight:700}.card-label.gold{color:var(--gold-2)}.card-label.ember{color:var(--ember-2)}.card-title{font-family:var(--font-display);color:var(--ink-text);font-size:22px;font-weight:500}.card-sub{color:var(--ink-muted);margin-top:4px;font-size:12.5px}.card-quote{font-family:var(--font-display);color:var(--ink-muted);font-size:15.5px;font-style:italic;line-height:1.55}.cta-pill{cursor:pointer;background:var(--gold-solid);color:var(--ink-solid);border-radius:var(--radius-pill);transition:transform var(--dur-s) var(--ease), box-shadow var(--dur-s) var(--ease), filter var(--dur-s) var(--ease);border:none;align-items:center;gap:10px;padding:15px 24px;font-size:14.5px;font-weight:700;display:inline-flex;box-shadow:0 10px 30px #00000059}.cta-pill:hover{filter:brightness(1.08);transform:translateY(-3px)scale(1.015);box-shadow:0 16px 36px #c9a13a66}.cta-pill:active{transform:translateY(-1px)scale(.99)}.cta-pill .arrow{transition:transform var(--dur-s) var(--ease)}.cta-pill:hover .arrow{transform:translate(4px)}.learn-shell{grid-template-columns:240px 1fr;gap:40px;padding-top:20px;display:grid}.rail{z-index:20;align-self:start;position:sticky;top:96px}.rail-eyebrow{color:var(--ember-2);letter-spacing:.14em;text-transform:uppercase;margin-bottom:16px;font-size:11px;font-weight:700}.rail-chapter{font-family:var(--font-display);color:var(--ink-text);text-align:left;margin-bottom:18px;font-size:19px}.chapter-switch{align-items:center;gap:4px;margin-bottom:18px;display:flex;position:relative}.chapter-arrow{border:1px solid var(--ink-line);background:var(--ink-raised);width:26px;height:26px;color:var(--ink-muted);cursor:pointer;transition:border-color var(--dur-s), color var(--dur-s), transform var(--dur-s);border-radius:50%;flex:none;justify-content:center;align-items:center;padding:0;display:flex}.chapter-arrow .icon{stroke-width:2.4px;width:14px;height:14px}.chapter-arrow:hover:not(:disabled){border-color:var(--gold);color:var(--gold-2);transform:translateY(-1px)}.chapter-arrow:disabled{opacity:.35;cursor:default}.chapter-jump{border:1px solid var(--ink-line);background:var(--ink-raised);min-width:0;color:var(--ink-text);border-radius:var(--radius-pill);cursor:pointer;transition:border-color var(--dur-s) var(--ease), transform var(--dur-s) var(--ease), box-shadow var(--dur-s) var(--ease);flex:1;align-items:center;gap:10px;padding:8px 14px;display:flex}.chapter-jump:hover{border-color:var(--gold);transform:translateY(-1px);box-shadow:0 8px 20px #0000002e}.chapter-jump[aria-expanded=true]{border-color:var(--gold)}.chapter-jump-index{font-family:var(--font-mono);letter-spacing:.05em;color:var(--ink-muted);flex:none;font-size:10.5px;font-weight:700}.chapter-jump-steps{flex:1;align-items:center;gap:4px;min-width:0;display:flex}.chapter-jump-steps .step{background:var(--ink-faint);width:5px;height:5px;transition:background var(--dur-s), transform var(--dur-s), box-shadow var(--dur-s);border-radius:50%;flex:none}.chapter-jump-steps .step.done{background:var(--moss)}.chapter-jump-steps .step.current{background:var(--gold);transform:scale(1.3);box-shadow:0 0 0 3px #c9a13a38}.chapter-jump-chevron{width:12px;height:12px;stroke:var(--ink-muted);transition:transform var(--dur-s) var(--ease);flex:none}.chapter-jump[aria-expanded=true] .chapter-jump-chevron{transform:rotate(180deg)}.chapter-list{z-index:30;background:var(--ink-raised);border:1px solid var(--ink-line);transform-origin:top;max-height:280px;animation:chapter-list-in var(--dur-s) var(--ease) both;border-radius:14px;margin:0;padding:6px;list-style:none;position:absolute;top:calc(100% + 8px);left:0;right:0;overflow-y:auto;box-shadow:0 20px 44px #0006}@keyframes chapter-list-in{0%{opacity:0;transform:translateY(-6px)scale(.98)}to{opacity:1;transform:translateY(0)scale(1)}}.chapter-list[hidden]{display:none}.chapter-list li{display:flex}.chapter-list li+li{margin-top:2px}.chapter-list button{text-align:left;cursor:pointer;width:100%;color:var(--ink-muted);transition:background var(--dur-s), color var(--dur-s);background:0 0;border:none;border-radius:10px;align-items:center;gap:10px;padding:10px 11px;font-size:12.5px;display:flex}.chapter-list button:hover{color:var(--ink-text);background:#c9a13a1f}.chapter-list button[aria-current=true]{color:var(--gold-2);background:#c9a13a14;font-weight:700}.chapter-list-num{font-family:var(--font-mono);color:var(--ink-faint);flex:none;width:16px;font-size:10.5px}.chapter-list button[aria-current=true] .chapter-list-num{color:var(--gold-2)}.chapter-list-name{text-overflow:ellipsis;white-space:nowrap;flex:1;min-width:0;overflow:hidden}.chapter-list-status{width:16px;height:16px;color:var(--ink-faint);flex:none;justify-content:center;align-items:center;display:flex}.chapter-list-status .icon{stroke-width:2.2px;width:13px;height:13px}.chapter-list button[aria-current=true] .chapter-list-status{color:var(--gold-2)}.stage-list{flex-direction:column;gap:2px;margin:0 0 26px;padding:0;list-style:none;display:flex}.stage-list li{color:var(--ink-faint);border-left:2px solid var(--ink-line);transition:color var(--dur-s), border-color var(--dur-s);align-items:center;gap:10px;padding:8px 0 8px 14px;font-size:12.5px;display:flex}.stage-list li .dot{background:var(--ink-faint);width:6px;height:6px;transition:background var(--dur-s), box-shadow var(--dur-s);border-radius:50%;flex:none}.stage-list li.done{color:var(--ink-muted);border-color:var(--moss)}.stage-list li.done .dot{background:var(--moss)}.stage-list li.current{color:var(--gold-2);border-color:var(--gold);font-weight:600}.stage-list li.current .dot{background:var(--gold);box-shadow:0 0 0 4px #c9a13a2e}.card-stage{background:var(--paper);color:var(--paper-text);border-radius:26px;flex-direction:column;min-height:360px;padding:40px 44px 34px;display:flex;position:relative;overflow:hidden;box-shadow:0 30px 70px #00000073}.card-stage:after{content:"";background:linear-gradient(90deg,var(--gold),var(--ember));height:5px;position:absolute;inset:0 0 auto}.stage-top{justify-content:space-between;align-items:flex-start;margin-bottom:18px;display:flex}.stage-kicker{letter-spacing:.16em;text-transform:uppercase;color:var(--ember);font-size:11.5px;font-weight:700}.freq-badge{font-family:var(--font-ui);color:var(--ember);border-radius:var(--radius-chip);white-space:nowrap;background:#b8431c1a;border:1px solid #b8431c40;align-items:center;gap:5px;padding:5px 10px 5px 8px;font-size:11px;font-weight:600;display:flex}.freq-badge .icon{width:11px;height:11px;stroke:var(--ember);stroke-width:2.4px}.freq-badge b{font-family:var(--font-mono);font-weight:700}.stage-heading{font-family:var(--font-display);margin-bottom:14px;font-size:clamp(26px,3vw,34px);font-weight:500}.stage-rule{background:var(--paper-line);border:none;width:40px;height:2px;margin:0 0 18px}.stage-body{color:#3a2f1e;max-width:60ch;font-size:16px;line-height:1.65}.stage-body b{color:var(--paper-text)}.pyq-box{background:var(--pyq-bg);border:1px solid var(--paper-line);border-left:3px solid var(--ember);border-radius:14px;margin-top:22px;padding:18px 20px}.pyq-label{letter-spacing:.14em;color:var(--paper-muted);margin-bottom:8px;font-size:10.5px;font-weight:700}.pyq-q{margin-bottom:12px;font-size:14.5px;line-height:1.55}.pyq-opts{grid-template-columns:1fr 1fr;gap:8px;display:grid}.pyq-opt{border:1px solid var(--paper-line);background:var(--paper-raised);cursor:pointer;text-align:left;color:var(--paper-text);transition:border-color var(--dur-s), background var(--dur-s), transform var(--dur-s);border-radius:10px;justify-content:space-between;align-items:center;gap:8px;padding:9px 12px;font-size:13px;display:flex}.pyq-opt:hover{border-color:var(--ember);transform:translateY(-1px)}.pyq-opt:disabled{opacity:1;cursor:default;transform:none}.pyq-opt:disabled:not(.correct):not(.wrong){opacity:.55}.pyq-opt.correct{border-color:var(--moss);color:#25381a;background:#eaf0e2;font-weight:600}.pyq-opt.wrong{border-color:var(--ember);color:#5c2410;background:#fbe9e0;font-weight:600}.pyq-opt .fb-icon{box-sizing:border-box;border-radius:50%;flex:none;width:22px;height:22px;padding:4px}.pyq-opt.correct .fb-icon{stroke:#fff;background:#3f6b25}.pyq-opt.wrong .fb-icon{stroke:#fff;background:#a6431c}.pyq-feedback{animation:rise-in var(--dur-s) var(--ease) both;border-radius:10px;margin-top:12px;padding:12px 14px;font-size:12.5px;font-weight:600}.pyq-feedback .fb-head{align-items:center;gap:8px;display:flex}.pyq-feedback .fb-head .fb-icon{box-sizing:border-box;border-radius:50%;flex:none;width:20px;height:20px;padding:3px}.pyq-feedback .fb-explain{margin:6px 0 0 28px;font-size:12px;font-weight:500;line-height:1.5}.pyq-feedback.correct{color:#25381a;background:#eaf0e2}.pyq-feedback.correct .fb-icon{stroke:#fff;background:#3f6b25}.pyq-feedback.wrong{color:#5c2410;background:#fbe9e0}.pyq-feedback.wrong .fb-icon{stroke:#fff;background:#a6431c}.stage-foot{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:14px;margin-top:auto;padding-top:22px;display:flex}.stage-foot-left{align-items:center;gap:12px;display:flex}.chapter-meta{color:var(--paper-muted);font-size:12px}.prev-btn{border:1px solid var(--paper-line);background:var(--paper-raised);width:38px;height:38px;color:var(--paper-text);cursor:pointer;transition:border-color var(--dur-s), transform var(--dur-s), opacity var(--dur-s);border-radius:50%;flex:none;justify-content:center;align-items:center;padding:0;display:flex}.prev-btn .icon{stroke-width:2.4px;width:16px;height:16px}.prev-btn:hover:not(:disabled){border-color:var(--ember);transform:translateY(-2px)}.prev-btn:disabled{opacity:.3;cursor:default}.next-btn{cursor:pointer;background:var(--gold-solid);color:var(--ink-solid);border-radius:var(--radius-pill);transition:transform var(--dur-s) var(--ease), box-shadow var(--dur-s) var(--ease), filter var(--dur-s) var(--ease);border:none;align-items:center;gap:8px;padding:13px 22px;font-size:14px;font-weight:700;display:inline-flex}.next-btn:hover{filter:brightness(1.08);transform:translateY(-2px);box-shadow:0 12px 26px #c9a13a59}.next-btn .arrow{transition:transform var(--dur-s) var(--ease)}.next-btn:hover .arrow{transform:translate(4px)}.stage-placeholder{flex-direction:column;flex:1;justify-content:center;align-items:flex-start;gap:14px;padding:20px 0;display:flex}.stage-placeholder .icon{width:34px;height:34px;stroke:var(--paper-muted);stroke-width:1.6px}.stage-placeholder h3{font-family:var(--font-display);font-size:24px;font-weight:500}.stage-placeholder p{color:var(--paper-muted);max-width:44ch;font-size:14px;line-height:1.6}.coming-up{opacity:.82;margin-top:44px}.coming-up-label{letter-spacing:.14em;text-transform:uppercase;color:var(--ink-muted);margin-bottom:8px;font-size:10px;font-weight:700}.coming-up ol{flex-direction:column;gap:1px;margin:0;padding:0;list-style:none;display:flex}.coming-up li{color:var(--ink-muted);border-bottom:1px solid var(--ink-line);justify-content:space-between;align-items:center;gap:10px;padding:9px 4px;font-size:12.5px;display:flex}.coming-up li .freq{font-family:var(--font-mono);color:var(--ink-muted);font-size:10.5px}.coming-up-more{cursor:pointer;color:var(--ink-muted);text-underline-offset:3px;transition:color var(--dur-s);background:0 0;border:none;padding:9px 4px 0;font-size:11.5px;font-weight:600;text-decoration:underline}.coming-up-more:hover{color:var(--ink-text)}.stat-strip{grid-template-columns:repeat(4,1fr);gap:14px;margin:24px 0 28px;display:grid}.stat-tile{background:var(--stat-tile-bg);border:1px solid var(--stat-tile-ring-track);border-radius:16px;align-items:center;gap:14px;padding:18px 20px;display:flex;box-shadow:0 10px 26px #00000038}.mastery-ring{flex:none}#ringMastered{transition:stroke-dasharray var(--dur-l) var(--ease)}.stat-icon-circle{border:1px solid var(--stat-tile-ring-track);border-radius:50%;flex:none;justify-content:center;align-items:center;width:44px;height:44px;display:flex}.stat-icon-circle .icon{width:19px;height:19px;stroke:var(--stat-tile-fg-muted);stroke-width:2px;flex:none}.stat-tile .num{font-family:var(--font-mono);color:var(--stat-tile-fg);font-size:26px;line-height:1}.stat-tile .lbl{letter-spacing:.1em;text-transform:uppercase;color:var(--stat-tile-fg-muted);margin-top:4px;font-size:10.5px;font-weight:700}.stat-tile.accent .num{color:var(--stat-tile-accent)}.toolbar{flex-wrap:wrap;align-items:center;gap:12px;margin-bottom:22px;display:flex}.search-box{background:var(--ink-raised);border:1px solid var(--ink-line);border-radius:var(--radius-pill);min-width:220px;color:var(--ink-muted);flex:1;align-items:center;gap:10px;padding:11px 18px;font-size:13.5px;display:flex}.search-box input{color:var(--ink-text);width:100%;font-size:13.5px;font-family:var(--font-ui);background:0 0;border:none;outline:none}.filter-tabs{background:var(--ink-raised);border:1px solid var(--ink-line);border-radius:var(--radius-pill);gap:4px;padding:4px;display:flex}.filter-tabs button{color:var(--ink-muted);border-radius:var(--radius-pill);cursor:pointer;transition:background var(--dur-s), color var(--dur-s);background:0 0;border:none;padding:8px 14px;font-size:12px;font-weight:600}.filter-tabs button.active{background:var(--gold-solid);color:var(--ink-solid)}.unit-grid{grid-template-columns:repeat(auto-fill,minmax(300px,1fr));align-content:start;align-items:start;gap:16px;min-height:220px;display:grid}.unit-empty{text-align:center;border:1px dashed var(--ink-line);border-radius:var(--radius-card);animation:rise-in var(--dur-s) var(--ease) both;flex-direction:column;grid-column:1/-1;justify-content:center;align-items:center;gap:6px;padding:56px 24px;display:flex}.unit-empty-title{font-family:var(--font-display);color:var(--ink-text);font-size:19px}.unit-empty-body{color:var(--ink-muted);max-width:40ch;font-size:13px}.unit-card{background:var(--ink-raised);border:1px solid var(--ink-line);border-radius:var(--radius-card);cursor:pointer;transition:border-color var(--dur-s) var(--ease), transform var(--dur-s) var(--ease), box-shadow var(--dur-s) var(--ease);padding:20px 22px}.unit-card:hover{border-color:var(--gold);transform:translateY(-3px);box-shadow:0 16px 34px #00000059}.unit-head{justify-content:space-between;align-items:flex-start;gap:10px;margin-bottom:6px;display:flex}.unit-name{font-family:var(--font-display);color:var(--ink-text);font-size:18px}.unit-count{font-family:var(--font-mono);color:var(--ink-muted);flex:none;padding-top:2px;font-size:11.5px}.unit-status{font-family:var(--font-mono);letter-spacing:.05em;text-transform:uppercase;align-items:center;gap:5px;margin-top:4px;font-size:10px;font-weight:700;display:flex}.unit-status:before{content:"";background:currentColor;border-radius:50%;flex:none;width:6px;height:6px}.unit-status.mastered{color:var(--moss)}.unit-status.progress{color:var(--gold)}.unit-status.locked{color:var(--ink-muted)}.unit-bar{background:var(--ink-line);border-radius:4px;height:4px;margin:10px 0 14px;overflow:hidden}.unit-bar span{background:linear-gradient(90deg,var(--moss),var(--gold));height:100%;transition:width var(--dur-l) var(--ease);display:block}.constellation-mini{flex-wrap:wrap;gap:5px;max-height:74px;display:flex;overflow:hidden}.star{background:var(--ink-faint);width:7px;height:7px;transition:background var(--dur-s), box-shadow var(--dur-s), transform var(--dur-s);border-radius:50%}.star.mastered{background:var(--moss);box-shadow:0 0 8px #7f98638c}.star.current{background:var(--gold);animation:2.4s ease-in-out infinite pulse-star;box-shadow:0 0 10px #c9a13acc}.unit-card:hover .star{transform:scale(1.12)}@keyframes pulse-star{0%,to{opacity:1}50%{opacity:.45}}.unit-detail{border-top:1px dashed var(--ink-line);margin-top:8px;padding-top:16px;display:none}.unit-card.expanded .unit-detail{display:block}.concept-row{color:var(--ink-muted);border-bottom:1px solid var(--ink-line);justify-content:space-between;align-items:center;gap:10px;padding:7px 0;font-size:12.5px;display:flex}.concept-row:last-child{border-bottom:none}.concept-row.mastered{color:var(--moss)}.concept-row.current{color:var(--gold-2);font-weight:600}.concept-row .freq{font-family:var(--font-mono);color:var(--ember-2);font-size:10.5px}.no-data-note{color:var(--ink-muted);padding-top:4px;font-size:11.5px;font-style:italic}.section-title{font-family:var(--font-display);color:var(--ink-muted);letter-spacing:.02em;margin:34px 0 4px;font-size:15px}.unit-card[tabindex]:focus-visible{outline:2px solid var(--gold-2);outline-offset:3px}.login-screen{justify-content:center;align-items:center;min-height:88vh;padding-top:20px;display:flex}.login-card{text-align:center;width:100%;max-width:380px}.login-mark{font-family:var(--font-ui);letter-spacing:.14em;color:var(--gold-2);margin-bottom:28px;font-size:14px;font-weight:700}.login-mark .dot{color:var(--ember-2)}.login-glyph{background:var(--ink-raised);border:1px solid var(--ink-line);border-radius:50%;justify-content:center;align-items:center;width:56px;height:56px;margin:0 auto 22px;display:flex}.login-glyph .icon{width:26px;height:26px;stroke:var(--gold-2)}.login-card h1{font-family:var(--font-display);color:var(--ink-text);margin-bottom:8px;font-size:clamp(26px,4vw,32px);font-weight:500}.login-card p.sub{color:var(--ink-muted);margin-bottom:30px;font-size:13.5px;line-height:1.5}.social-btn{border-radius:var(--radius-pill);border:1px solid var(--ink-line);background:var(--ink-raised);width:100%;color:var(--ink-text);font-family:var(--font-ui);cursor:pointer;transition:transform var(--dur-s) var(--ease), border-color var(--dur-s) var(--ease), background var(--dur-s) var(--ease);justify-content:center;align-items:center;gap:12px;margin-bottom:10px;padding:13px 18px;font-size:14px;font-weight:600;display:flex}.social-btn:hover{border-color:var(--gold);background:var(--paper-raised);color:var(--ink-solid);transform:translateY(-2px)}.social-btn .icon{width:18px;height:18px}.login-divider{color:var(--ink-faint);letter-spacing:.08em;text-transform:uppercase;align-items:center;gap:12px;margin:20px 0;font-size:11px;display:flex}.login-divider:before,.login-divider:after{content:"";background:var(--ink-line);flex:1;height:1px}.guest-link{color:var(--ink-muted);cursor:pointer;text-underline-offset:3px;background:0 0;border:none;padding:8px;font-size:13px;text-decoration:underline}.guest-link:hover{color:var(--ink-text)}.login-legal{color:var(--ink-faint);max-width:320px;margin-top:26px;margin-left:auto;margin-right:auto;font-size:11px;line-height:1.5}.success-overlay{z-index:80;background:var(--scrim);-webkit-backdrop-filter:blur(3px);backdrop-filter:blur(3px);animation:overlay-in var(--dur-m) var(--ease) both;justify-content:center;align-items:center;padding:24px;display:flex;position:fixed;inset:0}.success-overlay[hidden]{display:none}@keyframes overlay-in{0%{opacity:0}to{opacity:1}}.success-card{text-align:center;background:var(--paper);width:100%;max-width:380px;color:var(--paper-text);animation:card-pop var(--dur-m) var(--ease) both;border-radius:26px;padding:40px 30px 32px;box-shadow:0 40px 90px #00000080}@keyframes card-pop{0%{opacity:0;transform:translateY(18px)scale(.96)}to{opacity:1;transform:translateY(0)scale(1)}}.success-badge{background:radial-gradient(circle at 35% 30%, var(--moss), #4f6b3a);color:#fff;width:64px;height:64px;animation:badge-pulse 1.8s var(--ease) 1;border-radius:50%;justify-content:center;align-items:center;margin:0 auto 20px;display:flex;box-shadow:0 0 0 8px #7f98632e}.success-badge .icon{width:30px;height:30px}@keyframes badge-pulse{0%{transform:scale(.5);box-shadow:0 0 #7f986366}60%{transform:scale(1.08)}to{transform:scale(1);box-shadow:0 0 0 8px #7f98632e}}.success-card h2{font-family:var(--font-display);margin-bottom:8px;font-size:26px;font-weight:500}.success-sub{color:var(--paper-muted);margin-bottom:22px;font-size:13.5px;line-height:1.55}.success-stats{border-top:1px solid var(--paper-line);border-bottom:1px solid var(--paper-line);grid-template-columns:repeat(3,1fr);gap:8px;margin-bottom:20px;padding:16px 4px;display:grid}.success-stats b{font-family:var(--font-mono);color:var(--paper-text);font-size:20px;display:block}.success-stats span{letter-spacing:.08em;text-transform:uppercase;color:var(--paper-muted);font-size:10px;font-weight:700}.success-nudge{font-size:12.5px;font-style:italic;font-family:var(--font-display);color:var(--paper-muted);margin-bottom:22px}.success-card .cta-pill{justify-content:center;width:100%}@media (max-width:860px){.home-grid{grid-template-columns:1fr;gap:28px;min-height:auto}.brain-wrap{max-width:300px}.learn-shell{grid-template-columns:1fr;gap:22px}.rail{flex-wrap:wrap;align-items:center;gap:10px 16px;display:flex;position:static}.rail-eyebrow{flex:auto;margin-bottom:0}.chapter-switch{order:3;width:100%;margin-bottom:0}.rail-chapter{text-align:right;flex:auto;order:2;margin-bottom:0}.stage-list{display:none}.card-stage{padding:28px 22px 26px}.stat-strip{grid-template-columns:repeat(2,1fr)}}@media (max-width:520px){header.top{gap:8px;padding:16px}.app{padding:0 16px 48px}.home-grid{gap:18px;padding-top:16px}.brain-wrap{max-width:148px}.brain-caption{margin-top:8px;font-size:10.5px}.pyq-opts{grid-template-columns:1fr}.stat-strip{grid-template-columns:1fr 1fr}.seg-switch button{padding:7px 9px}body:not(.is-login) #langSwitch{display:none}.menu-lang-row{display:flex}}