@import "https://fonts.googleapis.com/css2?family=PT+Serif:ital,wght@0,400;0,700;1,400;1,700&family=PT+Sans:ital,wght@0,400;0,700;1,400&family=PT+Mono&display=swap";@layer components;@layer properties{@supports (((-webkit-hyphens:none)) and (not (margin-trim:inline))) or ((-moz-orient:inline) and (not (color:rgb(from red r g b)))){*,:before,:after,::backdrop{--tw-rotate-x:initial;--tw-rotate-y:initial;--tw-rotate-z:initial;--tw-skew-x:initial;--tw-skew-y:initial;--tw-border-style:solid;--tw-ordinal:initial;--tw-slashed-zero:initial;--tw-numeric-figure:initial;--tw-numeric-spacing:initial;--tw-numeric-fraction:initial;--tw-blur:initial;--tw-brightness:initial;--tw-contrast:initial;--tw-grayscale:initial;--tw-hue-rotate:initial;--tw-invert:initial;--tw-opacity:initial;--tw-saturate:initial;--tw-sepia:initial;--tw-drop-shadow:initial;--tw-drop-shadow-color:initial;--tw-drop-shadow-alpha:100%;--tw-drop-shadow-size:initial}}}@layer theme{:root,:host{--font-sans:ui-sans-serif, system-ui, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";--font-serif:ui-serif, Georgia, Cambria, "Times New Roman", Times, serif;--font-mono:ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;--shadow-sm:0 1px 3px 0 #0000001a, 0 1px 2px -1px #0000001a;--shadow-md:0 4px 6px -1px #0000001a, 0 2px 4px -2px #0000001a;--shadow-xl:0 20px 25px -5px #0000001a, 0 8px 10px -6px #0000001a;--ease-out:cubic-bezier(0, 0, .2, 1);--default-transition-duration:.15s;--default-transition-timing-function:cubic-bezier(.4, 0, .2, 1);--default-font-family:var(--font-sans);--default-mono-font-family:var(--font-mono);--font-display:var(--font-display);--font-body:var(--font-body)}}@layer base{*,:after,:before,::backdrop{box-sizing:border-box;border:0 solid;margin:0;padding:0}::file-selector-button{box-sizing:border-box;border:0 solid;margin:0;padding:0}html,:host{-webkit-text-size-adjust:100%;tab-size:4;line-height:1.5;font-family:var(--default-font-family,ui-sans-serif, system-ui, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji");font-feature-settings:var(--default-font-feature-settings,normal);font-variation-settings:var(--default-font-variation-settings,normal);-webkit-tap-highlight-color:transparent}hr{height:0;color:inherit;border-top-width:1px}abbr:where([title]){-webkit-text-decoration:underline dotted;text-decoration:underline dotted}h1,h2,h3,h4,h5,h6{font-size:inherit;font-weight:inherit}a{color:inherit;-webkit-text-decoration:inherit;-webkit-text-decoration:inherit;-webkit-text-decoration:inherit;-webkit-text-decoration:inherit;text-decoration:inherit}b,strong{font-weight:bolder}code,kbd,samp,pre{font-family:var(--default-mono-font-family,ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace);font-feature-settings:var(--default-mono-font-feature-settings,normal);font-variation-settings:var(--default-mono-font-variation-settings,normal);font-size:1em}small{font-size:80%}sub,sup{vertical-align:baseline;font-size:75%;line-height:0;position:relative}sub{bottom:-.25em}sup{top:-.5em}table{text-indent:0;border-color:inherit;border-collapse:collapse}:-moz-focusring{outline:auto}progress{vertical-align:baseline}summary{display:list-item}ol,ul,menu{list-style:none}img,svg,video,canvas,audio,iframe,embed,object{vertical-align:middle;display:block}img,video{max-width:100%;height:auto}button,input,select,optgroup,textarea{font:inherit;font-feature-settings:inherit;font-variation-settings:inherit;letter-spacing:inherit;color:inherit;opacity:1;background-color:#0000;border-radius:0}::file-selector-button{font:inherit;font-feature-settings:inherit;font-variation-settings:inherit;letter-spacing:inherit;color:inherit;opacity:1;background-color:#0000;border-radius:0}:where(select:is([multiple],[size])) optgroup{font-weight:bolder}:where(select:is([multiple],[size])) optgroup option{padding-inline-start:20px}::file-selector-button{margin-inline-end:4px}::placeholder{opacity:1}@supports (not ((-webkit-appearance:-apple-pay-button))) or (contain-intrinsic-size:1px){::placeholder{color:currentColor}@supports (color:color-mix(in lab, red, red)){::placeholder{color:color-mix(in oklab, currentcolor 50%, transparent)}}}textarea{resize:vertical}::-webkit-search-decoration{-webkit-appearance:none}::-webkit-date-and-time-value{min-height:1lh;text-align:inherit}::-webkit-datetime-edit{display:inline-flex}::-webkit-datetime-edit-fields-wrapper{padding:0}::-webkit-datetime-edit{padding-block:0}::-webkit-datetime-edit-year-field{padding-block:0}::-webkit-datetime-edit-month-field{padding-block:0}::-webkit-datetime-edit-day-field{padding-block:0}::-webkit-datetime-edit-hour-field{padding-block:0}::-webkit-datetime-edit-minute-field{padding-block:0}::-webkit-datetime-edit-second-field{padding-block:0}::-webkit-datetime-edit-millisecond-field{padding-block:0}::-webkit-datetime-edit-meridiem-field{padding-block:0}::-webkit-calendar-picker-indicator{line-height:1}:-moz-ui-invalid{box-shadow:none}button,input:where([type=button],[type=reset],[type=submit]){appearance:button}::file-selector-button{appearance:button}::-webkit-inner-spin-button{height:auto}::-webkit-outer-spin-button{height:auto}[hidden]:where(:not([hidden=until-found])){display:none!important}}@layer utilities{.collapse{visibility:collapse}.visible{visibility:visible}.sr-only{clip-path:inset(50%);white-space:nowrap;border-width:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}.absolute{position:absolute}.fixed{position:fixed}.relative{position:relative}.sticky{position:sticky}.block{display:block}.flex{display:flex}.grid{display:grid}.hidden{display:none}.inline-block{display:inline-block}.inline-flex{display:inline-flex}.table{display:table}.transform{transform:var(--tw-rotate-x,) var(--tw-rotate-y,) var(--tw-rotate-z,) var(--tw-skew-x,) var(--tw-skew-y,)}.resize{resize:both}.border{border-style:var(--tw-border-style);border-width:1px}.break-all{word-break:break-all}.uppercase{text-transform:uppercase}.italic{font-style:italic}.ordinal{--tw-ordinal:ordinal;font-variant-numeric:var(--tw-ordinal,) var(--tw-slashed-zero,) var(--tw-numeric-figure,) var(--tw-numeric-spacing,) var(--tw-numeric-fraction,)}.tabular-nums{--tw-numeric-spacing:tabular-nums;font-variant-numeric:var(--tw-ordinal,) var(--tw-slashed-zero,) var(--tw-numeric-figure,) var(--tw-numeric-spacing,) var(--tw-numeric-fraction,)}.underline{text-decoration-line:underline}.filter{filter:var(--tw-blur,) var(--tw-brightness,) var(--tw-contrast,) var(--tw-grayscale,) var(--tw-hue-rotate,) var(--tw-invert,) var(--tw-saturate,) var(--tw-sepia,) var(--tw-drop-shadow,)}.transition{transition-property:color,background-color,border-color,outline-color,text-decoration-color,fill,stroke,--tw-gradient-from,--tw-gradient-via,--tw-gradient-to,opacity,box-shadow,transform,translate,scale,rotate,filter,-webkit-backdrop-filter,backdrop-filter,display,content-visibility,overlay,pointer-events;transition-timing-function:var(--tw-ease,var(--default-transition-timing-function));transition-duration:var(--tw-duration,var(--default-transition-duration))}}:root{--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light;--font-display:"PT Serif", "Noto Serif", Georgia, "Times New Roman", serif;--font-body:"PT Sans", "Noto Sans", "Segoe UI", system-ui, sans-serif;--font-serif:"PT Serif", "Noto Serif", Georgia, serif;--font-mono:"PT Mono", "Cascadia Mono", Consolas, monospace;--bg:#f5f2ec;--bg-soft:#efebe2;--surface:#fff;--surface-2:#f4f1e9;--surface-3:#e9e4d9;--border:#ded8ca;--border-strong:#c3bcaa;--ink:#16233c;--text:#262c36;--text-mid:#4c5361;--text-muted:#6d7482;--primary:#1a2744;--primary-hover:#223256;--primary-soft:#e8ebf2;--primary-ring:#1a274447;--accent:#8a5a24;--accent-bright:#b5733a;--accent-soft:#f4ece0;--plum:#7a1f3d;--plum-soft:#f6e9ee;--primary-bg:#1a2744;--accent-bg:#8a5a24;--plum-bg:#7a1f3d;--on-brand:#fff;--deep:#16203a;--deep-2:#1d2a49;--deep-3:#26355a;--deep-border:#33436b;--on-dark:#f2efe8;--on-dark-mid:#c3ccdd;--on-dark-muted:#97a3ba;--success:#1b6b40;--success-soft:#e6f0e8;--warning:#8a5a24;--warning-soft:#f7efe0;--danger:#9c2229;--danger-soft:#f8e9e8;--info:#1a4d80;--info-soft:#e8eef5;--r-xs:2px;--r-sm:2px;--r-md:3px;--r-lg:4px;--r-xl:6px;--r-full:3px;--shadow-xs:none;--shadow-sm:0 1px 2px #16233c0d;--shadow-md:0 2px 10px #16233c14;--shadow-lg:0 8px 28px #16233c1f;--shadow-xl:0 16px 44px #16233c29;--shadow-glow:none;--glass-bg:#f5f2ecf7;--glass-blur:0px;--grad-primary:var(--primary-bg);--grad-accent:var(--accent-bg);--grad-line:linear-gradient(90deg, #7a1f3d 0 33.33%, #b5733a 33.33% 66.66%, #1a2744 66.66% 100%);--ease-out:cubic-bezier(.22, .61, .36, 1);--ease-spring:cubic-bezier(.22, .61, .36, 1);--dur-fast:.14s;--dur-mid:.22s;--dur-slow:.5s;--nav-h:60px;--container:1120px;--fs-xs:.75rem;--fs-sm:.85rem;--fs-base:.98rem;--fs-md:1.08rem;--fs-lg:1.3rem;--fs-xl:1.6rem;--viz-1:#1f3f7a;--viz-2:#b5733a;--viz-3:#1b6b58;--viz-4:#7a1f3d;--viz-5:#5c4b8a;--viz-6:#6b7a2e;--viz-grid:#ded8ca;--viz-axis:#6d7482;--viz-label:#4c5361;--navy:var(--ink);--burgundy:var(--plum);--copper:var(--accent);--cream:var(--bg);--cream-dark:var(--border);--text-dark:var(--text)}:root[data-theme=dark]{--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark;--bg:#14161b;--bg-soft:#191c22;--surface:#1c1f27;--surface-2:#22262f;--surface-3:#2a2f3a;--border:#333945;--border-strong:#4a5262;--ink:#f0ece3;--text:#e3dfd6;--text-mid:#b6b1a6;--text-muted:#908b80;--primary:#9db4d4;--primary-hover:#b7c8e0;--primary-soft:#1f2836;--primary-ring:#9db4d459;--accent:#cd9a5e;--accent-bright:#dcae74;--accent-soft:#2a2318;--plum:#d98a9e;--plum-soft:#2b1a20;--primary-bg:#2c4675;--accent-bg:#7a4f1f;--plum-bg:#8d2547;--deep:#10141c;--deep-2:#171c26;--deep-3:#222a38;--deep-border:#313a4a;--on-dark:#f0ece3;--on-dark-mid:#c1bcb1;--on-dark-muted:#948f84;--success:#6aab86;--success-soft:#172119;--warning:#cd9a5e;--warning-soft:#241d13;--danger:#e08a86;--danger-soft:#271818;--info:#8bb0d8;--info-soft:#161e28;--shadow-sm:0 1px 2px #00000073;--shadow-md:0 2px 10px #0000008c;--shadow-lg:0 8px 28px #0009;--shadow-xl:0 16px 44px #000000b3;--glass-bg:#14161bf7;--grad-line:linear-gradient(90deg, #d98a9e 0 33.33%, #cd9a5e 33.33% 66.66%, #9db4d4 66.66% 100%);--viz-1:#7d9cc9;--viz-2:#c08a4e;--viz-3:#4f9d86;--viz-4:#c9788f;--viz-5:#9b8bc4;--viz-6:#9aa860;--viz-grid:#333945;--viz-axis:#908b80;--viz-label:#b6b1a6}@media (prefers-color-scheme:dark){:root:not([data-theme=light]):not([data-theme=dark]){--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark;--bg:#14161b;--bg-soft:#191c22;--surface:#1c1f27;--surface-2:#22262f;--surface-3:#2a2f3a;--border:#333945;--border-strong:#4a5262;--ink:#f0ece3;--text:#e3dfd6;--text-mid:#b6b1a6;--text-muted:#908b80;--primary:#9db4d4;--primary-hover:#b7c8e0;--primary-soft:#1f2836;--primary-ring:#9db4d459;--accent:#cd9a5e;--accent-bright:#dcae74;--accent-soft:#2a2318;--plum:#d98a9e;--plum-soft:#2b1a20;--primary-bg:#2c4675;--accent-bg:#7a4f1f;--plum-bg:#8d2547;--deep:#10141c;--deep-2:#171c26;--deep-3:#222a38;--deep-border:#313a4a;--on-dark:#f0ece3;--on-dark-mid:#c1bcb1;--on-dark-muted:#948f84;--success:#6aab86;--success-soft:#172119;--warning:#cd9a5e;--warning-soft:#241d13;--danger:#e08a86;--danger-soft:#271818;--info:#8bb0d8;--info-soft:#161e28;--shadow-sm:0 1px 2px #00000073;--shadow-md:0 2px 10px #0000008c;--shadow-lg:0 8px 28px #0009;--shadow-xl:0 16px 44px #000000b3;--glass-bg:#14161bf7;--grad-line:linear-gradient(90deg, #d98a9e 0 33.33%, #cd9a5e 33.33% 66.66%, #9db4d4 66.66% 100%);--viz-1:#7d9cc9;--viz-2:#c08a4e;--viz-3:#4f9d86;--viz-4:#c9788f;--viz-5:#9b8bc4;--viz-6:#9aa860;--viz-grid:#333945;--viz-axis:#908b80;--viz-label:#b6b1a6}}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:calc(var(--nav-h) + 16px);-webkit-text-size-adjust:100%}body{font-family:var(--font-body);background:var(--bg);color:var(--text);-webkit-font-smoothing:antialiased;transition:background-color var(--dur-mid) ease, color var(--dur-mid) ease;margin:0;padding:0;font-size:16px;line-height:1.7;overflow-x:hidden}#root{width:100%;min-height:100vh}h1,h2,h3,h4,h5{font-family:var(--font-display);color:var(--ink);letter-spacing:-.005em;font-weight:700;line-height:1.3}a{color:var(--plum);text-underline-offset:.18em}::selection{background:var(--accent-soft);color:var(--ink)}:focus-visible{outline:2px solid var(--plum);outline-offset:2px}button,input,select,textarea{font-family:inherit}button{touch-action:manipulation}::-webkit-scrollbar{width:12px;height:12px}::-webkit-scrollbar-track{background:var(--surface-2)}::-webkit-scrollbar-thumb{background:var(--border-strong);border:3px solid var(--surface-2)}::-webkit-scrollbar-thumb:hover{background:var(--text-muted)}@keyframes fadeInUp{0%{opacity:0;transform:translateY(12px)}to{opacity:1;transform:none}}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes slideInLeft{0%{opacity:0;transform:translate(-14px)}to{opacity:1;transform:none}}@keyframes slideInRight{0%{opacity:0;transform:translate(14px)}to{opacity:1;transform:none}}@keyframes scaleIn{0%{opacity:0;transform:scale(.96)}to{opacity:1;transform:scale(1)}}@keyframes accentGrow{0%{transform:scaleX(0)}to{transform:scaleX(1)}}@keyframes shimmer{0%{background-position:-200% 0}to{background-position:200% 0}}@keyframes spin{to{transform:rotate(360deg)}}@keyframes popIn{0%{opacity:0;transform:translateY(-6px)}to{opacity:1;transform:none}}.anim-fade-up{animation:fadeInUp var(--dur-slow) var(--ease-out) both}.anim-fade-in{animation:fadeIn var(--dur-slow) ease both}.anim-slide-left{animation:slideInLeft var(--dur-slow) var(--ease-out) both}.anim-slide-right{animation:slideInRight var(--dur-slow) var(--ease-out) both}.anim-scale-in{animation:scaleIn .35s var(--ease-out) both}.anim-pop{animation:popIn .22s var(--ease-out) both}.anim-float{animation:none}.d-0{animation-delay:0s}.d-1{animation-delay:60ms}.d-2{animation-delay:.12s}.d-3{animation-delay:.18s}.d-4{animation-delay:.24s}.d-5{animation-delay:.3s}.d-6{animation-delay:.36s}.d-7{animation-delay:.42s}.d-8{animation-delay:.48s}.d-9{animation-delay:.54s}.d-10{animation-delay:.6s}.d-11{animation-delay:.66s}.reveal{opacity:0;transition:opacity .6s var(--ease-out), transform .6s var(--ease-out);transition-delay:var(--reveal-delay,0s);transform:translateY(14px)}.reveal.is-visible{opacity:1;transform:none}.reveal-scale{opacity:0}.reveal-scale.is-visible{opacity:1}.reveal-left{opacity:0;transform:translate(-16px)}.reveal-left.is-visible{opacity:1;transform:none}.aurora{background:var(--deep);color:var(--on-dark);position:relative}.aurora-blob{display:none}.gradient-text{color:var(--accent-bright)}.accent-line{background:var(--grad-line);height:3px}.accent-bar>div{transform-origin:0;animation:accentGrow .6s var(--ease-out) both}.accent-bar>div:first-child{animation-delay:50ms}.accent-bar>div:nth-child(2){animation-delay:.12s}.accent-bar>div:nth-child(3){animation-delay:.19s}.rule{background:var(--border);border:0;height:1px;margin:0}.rule-strong{background:var(--ink);border:0;height:2px;margin:0}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--r-md);transition:border-color var(--dur-mid) ease, box-shadow var(--dur-mid) ease}.card-hover:hover{border-color:var(--border-strong);box-shadow:var(--shadow-sm)}.glass{background:var(--glass-bg)}.glass-dark{background:var(--deep);border:1px solid var(--deep-border)}.spotlight:before{content:none}.hover-lift{transition:border-color var(--dur-mid) ease, box-shadow var(--dur-mid) ease}.hover-lift:hover{box-shadow:var(--shadow-sm)}.btn{border-radius:var(--r-sm);min-height:44px;font-family:var(--font-body);letter-spacing:.01em;cursor:pointer;white-space:nowrap;transition:background var(--dur-mid) ease, color var(--dur-mid) ease, border-color var(--dur-mid) ease;border:1px solid #0000;justify-content:center;align-items:center;gap:.5rem;padding:.6rem 1.25rem;font-size:.9rem;font-weight:700;text-decoration:none;display:inline-flex}.btn:disabled{opacity:.45;cursor:not-allowed}.btn-sm{min-height:36px;padding:.4rem .85rem;font-size:.82rem}.btn-lg{min-height:50px;padding:.85rem 1.75rem;font-size:.98rem}.btn-primary{background:var(--plum-bg);color:#fff;border-color:var(--plum-bg)}.btn-primary:hover{background:#63182f;border-color:#63182f}.btn-accent{background:var(--accent-bg);color:#fff;border-color:var(--accent-bg)}.btn-accent:hover{background:#714919}.btn-outline{color:var(--ink);border-color:var(--border-strong);background:0 0}.btn-outline:hover{border-color:var(--ink);background:var(--surface-2)}.btn-ghost{color:var(--text-mid);background:0 0}.btn-ghost:hover{color:var(--ink);background:var(--surface-2)}.btn-on-dark{color:var(--on-dark);background:0 0;border-color:#ffffff59}.btn-on-dark:hover{background:#ffffff1a;border-color:#fff9}.btn-danger{color:var(--danger);border-color:var(--danger);background:0 0}.btn-danger:hover{background:var(--danger);color:#fff}.icon-btn{border-radius:var(--r-sm);width:40px;height:40px;color:inherit;cursor:pointer;transition:background var(--dur-mid) ease, border-color var(--dur-mid) ease;background:0 0;border:1px solid #0000;justify-content:center;align-items:center;display:inline-flex}.icon-btn:hover{background:var(--surface-2);border-color:var(--border)}.pill{border:1px solid var(--border-strong);border-radius:var(--r-xs);letter-spacing:.03em;color:var(--text-mid);white-space:nowrap;background:0 0;align-items:center;gap:.35rem;padding:.15rem .55rem;font-size:.73rem;display:inline-flex}.pill-primary{color:var(--primary);border-color:var(--primary)}.pill-accent{color:var(--accent);border-color:var(--accent)}.pill-plum{color:var(--plum);border-color:var(--plum)}.pill-muted{color:var(--text-muted);border-color:var(--border)}.pill-on-dark{color:var(--on-dark-mid);border-color:#ffffff4d}.eyebrow{font-family:var(--font-body);letter-spacing:.16em;text-transform:uppercase;color:var(--plum);font-size:.72rem;font-weight:700}.input{background:var(--surface);border:1px solid var(--border-strong);border-radius:var(--r-sm);width:100%;min-height:44px;font-family:var(--font-body);color:var(--text);transition:border-color var(--dur-mid) ease, box-shadow var(--dur-mid) ease;padding:.6rem .85rem;font-size:.95rem}.input::placeholder{color:var(--text-muted)}.input:focus{border-color:var(--ink);box-shadow:inset 0 -2px 0 var(--plum);outline:none}.input:disabled{background:var(--surface-2);opacity:.7;cursor:not-allowed}.skeleton{background:linear-gradient(90deg, var(--surface-2) 25%, var(--surface-3) 37%, var(--surface-2) 63%);background-size:400% 100%;animation:1.5s linear infinite shimmer}.spinner-ring{border:2px solid var(--border-strong);border-top-color:var(--plum);border-radius:50%;width:20px;height:20px;animation:.8s linear infinite spin}.progress-track{background:var(--surface-3);border:1px solid var(--border);width:100%;height:8px;overflow:hidden}.progress-fill{background:var(--plum-bg);height:100%;transition:width .8s var(--ease-out)}.link-arrow{color:var(--plum);transition:border-color var(--dur-mid) ease;border-bottom:1px solid #0000;align-items:center;gap:.35rem;font-size:.86rem;font-weight:700;text-decoration:none;display:inline-flex}.link-arrow:hover{border-bottom-color:var(--plum)}.link-arrow .arrow,.link-arrow svg{transition:transform var(--dur-mid) var(--ease-out)}.link-arrow:hover .arrow,.link-arrow:hover svg{transform:translate(3px)}.nav-link{color:var(--text-mid);transition:color var(--dur-mid) ease;padding:.35rem 0;font-size:.88rem;text-decoration:none;position:relative}.nav-link:after{content:"";background:var(--plum-bg);transform-origin:0;height:2px;transition:transform var(--dur-mid) var(--ease-out);position:absolute;bottom:0;left:0;right:0;transform:scaleX(0)}.nav-link:hover{color:var(--ink)}.nav-link:hover:after,.nav-link.active:after{transform:scaleX(1)}.nav-link.active{color:var(--ink);font-weight:700}.lesson-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--r-md);height:100%;transition:border-color var(--dur-mid) ease, box-shadow var(--dur-mid) ease;padding:1.5rem;position:relative}.lesson-card:before{content:"";background:var(--plum-bg);transform-origin:0;width:3px;transition:transform var(--dur-mid) var(--ease-out);position:absolute;inset:-1px auto -1px -1px;transform:scaleX(0)}.lesson-card:hover{border-color:var(--border-strong);box-shadow:var(--shadow-sm)}.lesson-card:hover:before{transform:scaleX(1)}.author-card{border:1px solid var(--deep-border);border-radius:var(--r-md);transition:border-color var(--dur-mid) ease, background var(--dur-mid) ease;background:0 0;padding:1.6rem}.author-card:hover{background:#ffffff08;border-color:#ffffff59}.tab-content{animation:.3s both fadeIn}.theory-content{color:var(--text);font-family:var(--font-serif);font-size:1.02rem;line-height:1.85}.theory-content h2{font-size:var(--fs-lg);color:var(--ink);border-bottom:2px solid var(--ink);margin:2.4rem 0 1rem;padding-bottom:.5rem}.theory-content h3{font-size:var(--fs-md);color:var(--plum);margin:1.8rem 0 .7rem}.theory-content h4{font-size:var(--fs-base);color:var(--ink);margin:1.3rem 0 .5rem}.theory-content p{color:var(--text);margin-bottom:1.15rem}.theory-content ul,.theory-content ol{margin-bottom:1.15rem;padding-left:1.5rem}.theory-content li{color:var(--text);margin-bottom:.45rem}.theory-content li::marker{color:var(--plum)}.theory-content strong{color:var(--ink);font-weight:700}.theory-content em{font-style:italic}.theory-content code{font-family:var(--font-mono);background:var(--surface-2);border:1px solid var(--border);color:var(--plum);padding:.05em .35em;font-size:.88em}.theory-content .formula-box{background:var(--surface-2);color:var(--ink);border:1px solid var(--border);border-left:3px solid var(--accent-bright);font-family:var(--font-mono);margin:1.5rem 0;padding:1.15rem 1.4rem;font-size:.95rem;line-height:1.7;overflow-x:auto}.theory-content .highlight-box{background:var(--surface-2);border:1px solid var(--border);border-left:3px solid var(--plum);margin:1.4rem 0;padding:1rem 1.25rem;font-size:.97rem}.theory-content table{border-collapse:collapse;width:100%;font-family:var(--font-body);margin:1.6rem 0;font-size:.88rem}.theory-content th{color:var(--ink);text-align:left;border-top:2px solid var(--ink);border-bottom:1px solid var(--ink);background:0 0;padding:.6rem .8rem;font-weight:700}.theory-content td{border-bottom:1px solid var(--border);color:var(--text-mid);padding:.55rem .8rem}.theory-content tr:last-child td{border-bottom:2px solid var(--ink)}#mindmap-modal-root:fullscreen{background:var(--bg);flex-direction:column;width:100vw;max-width:100vw;height:100vh;max-height:100vh;display:flex}#mindmap-modal-root:-webkit-full-screen{width:100vw;height:100vh}.menu-row{color:var(--text);transition:background var(--dur-mid) ease;align-items:center;gap:.6rem;padding:.65rem 1rem;font-size:.87rem;text-decoration:none;display:flex}.menu-row:hover{background:var(--surface-2);color:var(--ink)}.mobile-row{border-bottom:1px solid var(--border);min-height:50px;color:var(--ink);font-family:var(--font-display);transition:padding-left var(--dur-mid) ease;background:0 0;align-items:center;gap:.7rem;padding:.75rem .25rem;font-size:1rem;text-decoration:none;display:flex}.mobile-row:hover,.mobile-row:active{padding-left:.6rem}.site-nav-mobile{display:none}@media (width<=860px){.site-nav-desktop{display:none!important}.site-nav-mobile{display:inline-flex}div.site-nav-mobile{display:block}}.sr-only{clip:rect(0 0 0 0);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}.footer-link{color:var(--on-dark-mid);transition:border-color var(--dur-mid) ease, color var(--dur-mid) ease;border-bottom:1px solid #0000;font-size:.87rem;text-decoration:none}.footer-link:hover{color:var(--on-dark);border-bottom-color:var(--on-dark-muted)}input[type=search]::-webkit-search-decoration{-webkit-appearance:none}input[type=search]::-webkit-search-cancel-button{-webkit-appearance:none}.data-row{transition:background var(--dur-fast) ease}.data-row:nth-child(2n){background:var(--surface-2)}.data-row:hover{background:var(--accent-soft)}input:not([type=checkbox]):not([type=radio]):focus,select:focus,textarea:focus{outline:none;border-color:var(--ink)!important}.wizard-option{text-align:left;background:var(--surface);border:1px solid var(--border);border-radius:var(--r-sm);cursor:pointer;width:100%;transition:border-color var(--dur-mid) ease, background var(--dur-mid) ease;padding:.9rem 1.1rem}.wizard-option:hover{border-color:var(--ink);background:var(--surface-2)}@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,:before,:after{transition-duration:.001ms!important;animation-duration:.001ms!important;animation-iteration-count:1!important}.reveal,.reveal-scale,.reveal-left{opacity:1!important;transform:none!important}}@media (width<=640px){:root{--nav-h:56px}.lesson-card{padding:1.2rem}.theory-content{font-size:1rem}}.player{border:1px solid var(--border-strong);border-radius:var(--r-md);background:var(--deep);position:relative;overflow:hidden}.player:focus-visible{outline:2px solid var(--plum);outline-offset:2px}.player-stage{aspect-ratio:16/9;background:#000;width:100%;position:relative;overflow:hidden}.player-frame,.player-frame iframe{border:0;width:100%;height:100%;position:absolute;inset:0}.player-surface{cursor:pointer;background:0 0;border:0;width:100%;height:100%;padding:0;position:absolute;inset:0}.player-poster{cursor:pointer;text-align:left;background:#000;border:0;width:100%;height:100%;padding:0;display:block;position:absolute;inset:0}.player-poster img{object-fit:cover;filter:saturate(.85)contrast(1.02);width:100%;height:100%;transition:transform .5s var(--ease-out), filter .3s ease;display:block}.player-poster:hover img{filter:saturate()contrast(1.02);transform:scale(1.02)}.player-poster-scrim{background:linear-gradient(#0a0e1859 0%,#0a0e1826 55%,#0a0e18d9 100%);position:absolute;inset:0}.player-poster-play{width:68px;height:68px;color:var(--on-dark);transition:background var(--dur-mid) ease, color var(--dur-mid) ease, border-color var(--dur-mid) ease;background:#0a0e1859;border:1px solid #ffffff8c;justify-content:center;align-items:center;display:flex;position:absolute;top:50%;left:50%;transform:translate(-50%,-50%)}.player-poster:hover .player-poster-play{background:var(--plum-bg);border-color:var(--plum-bg);color:#fff}.player-poster-label{font-family:var(--font-display);color:var(--on-dark);text-shadow:0 1px 2px #00000080;padding:1rem 1.25rem;font-size:1.05rem;font-weight:700;display:block;position:absolute;bottom:0;left:0}.player-poster-label em{font-family:var(--font-body);letter-spacing:.08em;text-transform:uppercase;color:var(--on-dark-mid);margin-top:.25rem;font-size:.78rem;font-style:normal;font-weight:400;display:block}.player-status{color:var(--on-dark-mid);background:#0a0e18bf;flex-direction:column;justify-content:center;align-items:center;gap:.75rem;font-size:.85rem;display:flex;position:absolute;inset:0}.player-center{width:56px;height:56px;color:var(--on-dark);pointer-events:none;background:#0a0e188c;border:1px solid #ffffff4d;justify-content:center;align-items:center;display:flex;position:absolute;top:50%;left:50%;transform:translate(-50%,-50%)}.player-bar{background:var(--deep);border-top:1px solid var(--deep-border);transition:opacity var(--dur-mid) ease, transform var(--dur-mid) ease;padding:.55rem .75rem .5rem}.player-rail{cursor:pointer;touch-action:none;align-items:center;height:16px;display:flex;position:relative}.player-rail:before{content:"";background:#fff3;height:3px;position:absolute;left:0;right:0}.player-rail-loaded,.player-rail-played{height:3px;position:absolute;left:0}.player-rail-loaded{background:#ffffff59}.player-rail-played{background:var(--accent-bright)}.player-rail-knob{background:var(--accent-bright);width:10px;height:10px;transition:transform var(--dur-fast) var(--ease-out);margin-left:-5px;position:absolute;top:50%;transform:translateY(-50%)scale(0)}.player-rail:hover .player-rail-knob,.player-rail:focus-visible .player-rail-knob,.player-rail.is-scrubbing .player-rail-knob,.player:focus-within .player-rail-knob{transform:translateY(-50%)scale(1)}.player-rail.is-scrubbing{cursor:grabbing}.player-rail.is-scrubbing .player-rail-knob{transform:translateY(-50%)scale(1.4)}.player-rail:focus-visible{outline:2px solid var(--accent-bright);outline-offset:3px}.player:has(.player-rail.is-scrubbing){-webkit-user-select:none;user-select:none}.player-buttons{align-items:center;gap:.35rem;margin-top:.15rem;display:flex}.player-spacer{flex:1}.player-btn{width:34px;height:34px;color:var(--on-dark-mid);cursor:pointer;transition:color var(--dur-mid) ease, border-color var(--dur-mid) ease;background:0 0;border:1px solid #0000;justify-content:center;align-items:center;display:inline-flex}.player-btn:hover{color:var(--on-dark);border-color:var(--deep-border)}.player-btn-text{width:auto;font-family:var(--font-body);font-variant-numeric:tabular-nums;padding:0 .55rem;font-size:.8rem;font-weight:700}.player-time{font-family:var(--font-mono);color:var(--on-dark-mid);white-space:nowrap;margin-left:.35rem;font-size:.78rem}.player-time span{opacity:.5;margin:0 .15rem}.player-volume{align-items:center;gap:.25rem;display:flex}.player-volume-range{opacity:0;width:0;height:3px;accent-color:var(--accent-bright);cursor:pointer;transition:width var(--dur-mid) var(--ease-out), opacity var(--dur-mid) ease;background:#fff3}.player-volume:hover .player-volume-range,.player-volume-range:focus-visible{opacity:1;width:74px}.player-rate{position:relative}.player-rate-menu{background:var(--deep-2);border:1px solid var(--deep-border);z-index:5;min-width:84px;animation:popIn .18s var(--ease-out) both;position:absolute;bottom:calc(100% + .4rem);right:0}.player-rate-item{width:100%;color:var(--on-dark-mid);font-family:var(--font-body);text-align:left;cursor:pointer;font-variant-numeric:tabular-nums;background:0 0;border:0;padding:.4rem .75rem;font-size:.8rem;display:block}.player-rate-item:hover{color:var(--on-dark);background:#ffffff14}.player-rate-item.is-active{color:var(--accent-bright);font-weight:700}.player:fullscreen{background:#000;border:0;border-radius:0;flex-direction:column;display:flex}.player:fullscreen .player-stage{aspect-ratio:auto;flex:1}.player:fullscreen .player-bar{background:linear-gradient(#0000,#000000e6);border-top:0;padding:2.5rem 1.25rem .75rem;position:absolute;bottom:0;left:0;right:0}.player:fullscreen .player-bar.is-hidden{opacity:0;pointer-events:none;transform:translateY(.5rem)}.player-caption{color:var(--text-muted);margin:.6rem 0 0;font-size:.78rem;line-height:1.7}.player-caption kbd{font-family:var(--font-mono);border:1px solid var(--border-strong);color:var(--text-mid);background:var(--surface);border-bottom-width:2px;margin:0 .1em;padding:.05em .35em;font-size:.72rem}.player-caption a,.player-caption button{font:inherit;color:var(--plum);text-underline-offset:2px;text-decoration:underline}.player-caption button{cursor:pointer;background:0 0;border:0;padding:0}.player-end{cursor:pointer;text-align:left;background:#0a0e18eb;border:0;width:100%;height:100%;padding:0;display:block;position:absolute;inset:0}.player-end:hover .player-poster-play{background:var(--plum-bg);border-color:var(--plum-bg);color:#fff}.player:fullscreen.is-idle{cursor:none}.player-video{object-fit:contain;cursor:pointer;background:#000;width:100%;height:100%;display:block;position:absolute;inset:0}.player-center-play{cursor:pointer;text-align:left;background:#0a0e1859;border:0;width:100%;height:100%;padding:0;display:block;position:absolute;inset:0}.player-center-play:hover .player-poster-play{background:var(--plum-bg);border-color:var(--plum-bg);color:#fff}.player-note{border:1px solid var(--deep-border);color:var(--on-dark-mid);background:#0a0e18e6;flex-wrap:wrap;align-items:center;gap:.75rem;padding:.5rem .75rem;font-size:.8rem;animation:.3s both fadeIn;display:flex;position:absolute;bottom:.75rem;left:.75rem;right:.75rem}.player-note button{border:1px solid var(--deep-border);color:var(--on-dark);font-family:var(--font-body);cursor:pointer;transition:border-color var(--dur-mid) ease, background var(--dur-mid) ease;background:0 0;padding:.2rem .6rem;font-size:.78rem}.player-note button:hover{background:#ffffff1a}.player-note button:last-child{border-color:#0000;margin-left:auto}@property --tw-rotate-x{syntax:"*";inherits:false}@property --tw-rotate-y{syntax:"*";inherits:false}@property --tw-rotate-z{syntax:"*";inherits:false}@property --tw-skew-x{syntax:"*";inherits:false}@property --tw-skew-y{syntax:"*";inherits:false}@property --tw-border-style{syntax:"*";inherits:false;initial-value:solid}@property --tw-ordinal{syntax:"*";inherits:false}@property --tw-slashed-zero{syntax:"*";inherits:false}@property --tw-numeric-figure{syntax:"*";inherits:false}@property --tw-numeric-spacing{syntax:"*";inherits:false}@property --tw-numeric-fraction{syntax:"*";inherits:false}@property --tw-blur{syntax:"*";inherits:false}@property --tw-brightness{syntax:"*";inherits:false}@property --tw-contrast{syntax:"*";inherits:false}@property --tw-grayscale{syntax:"*";inherits:false}@property --tw-hue-rotate{syntax:"*";inherits:false}@property --tw-invert{syntax:"*";inherits:false}@property --tw-opacity{syntax:"*";inherits:false}@property --tw-saturate{syntax:"*";inherits:false}@property --tw-sepia{syntax:"*";inherits:false}@property --tw-drop-shadow{syntax:"*";inherits:false}@property --tw-drop-shadow-color{syntax:"*";inherits:false}@property --tw-drop-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-drop-shadow-size{syntax:"*";inherits:false}