.course-root{--color-red:#c63a2f;--color-red-hover:#b03329;--course-white:#fff;--course-terracotta:#b34e35;--course-terracotta-ink:#8f442f;--course-lesson-bg:#e0e6d5;--course-lesson-bg-deep:#cdd6bb;--course-lesson-ink:#2f3b1c;--course-lesson-mark:#78894a;--course-expert-bg:#e6dfed;--course-expert-bg-deep:#d5cbe0;--course-expert-ink:#45335f;--course-expert-mark:#8770ab;--course-homework-bg:#dfe8e5;--course-homework-bg-deep:#cbdbd6;--course-homework-ink:#24483f;--course-homework-mark:#5a8b7d;--course-sky-bg:#dce7eb;--course-sky-bg-deep:#c6d8df;--course-sky-ink:#244555;--course-sky-mark:#5b8ba0;--course-idea:#f3d56b;--course-idea-glow:#fbefc2;--course-idea-ray:#d9a92b;--gradient-lesson:linear-gradient(135deg, var(--course-lesson-bg) 0%, var(--course-lesson-bg-deep) 100%);--gradient-expert:linear-gradient(135deg, var(--course-expert-bg) 0%, var(--course-expert-bg-deep) 100%);--gradient-homework:linear-gradient(135deg, var(--course-homework-bg) 0%, var(--course-homework-bg-deep) 100%);--gradient-sky:linear-gradient(135deg, var(--course-sky-bg) 0%, var(--course-sky-bg-deep) 100%);--focus-ring-width:3px;--focus-ring-offset:3px;--focus-ring-color:var(--color-ink);--disabled-bg:var(--color-border);--disabled-ink:var(--color-muted);--overlay-on-dark:color-mix(in srgb, var(--color-on-dark) 12%, transparent);--radius-sm:.375rem;--radius-md:.5rem;--radius-lg:.75rem;--radius-pill:9999px;--space-1:.25rem;--space-2:.5rem;--space-3:.75rem;--space-4:1rem;--space-5:1.5rem;--space-6:2rem;--space-7:3rem;--space-8:5rem;--text-xs:.75rem;--text-sm:.875rem;--text-base:1rem;--text-lg:1.25rem;--text-xl:1.75rem;--text-2xl:2.5rem;--text-hero:clamp(2.25rem, 4vw, 3.75rem);--container-max:72rem;--measure:44rem;--gutter:var(--space-7);--grid-gap:var(--space-5);--section-y:4rem;--section-y-compact:var(--space-7);--section-head-gap:var(--space-6);--header-h:4rem;--illu-line:#2c3440;--illu-paper:#f6f5f1;--illu-paper-line:#d6d4ce;--illu-grid:#dcdad4;--illu-bar-1:#bcbfbf;--illu-bar-2:#a2a7a9;--illu-bar-3:#9d9b98;--illu-crit-from:#e2422e;--illu-crit-to:#f08466;--illu-cone:#8c8a84;--illu-gear-hi:#f1efea;--illu-shadow:#5a4020;--illu-loop:#9cc6e4;--illu-loop-2:#7fb3da;--illu-loop-3:#8dbfe0;--illu-loop-deep:#2d5a86;--illu-cycle-1a:#f7c948;--illu-cycle-1b:#f59f1f;--illu-cycle-2a:#f0584a;--illu-cycle-2b:#e2285a;--illu-cycle-3a:#43b4f0;--illu-cycle-3b:#1f8fd6;--illu-cycle-4a:#8cc152;--illu-cycle-4b:#4fa046;--illu-box-top:#edcfa4;--illu-box-left:#dcae78;--illu-box-right:#c8955f;--illu-box-lid:#f6e2c4;--illu-box-lid-side:#e9c89c;--illu-box-label:#efe6d8;--illu-ray:#e53935;--illu-glow-blue:#2fb6ff;--illu-price-on-dark:#ff6b5e;--illu-after-1:#e3c77a;--illu-after-2:#6fb3d6;--illu-after-3:#b99be0;--illu-after-4:#d9b36a;--illu-results-1:#e3c77a;--illu-results-2:#5fd3b5;--illu-results-3:#e58fc0;--illu-results-4:#cbd27a;--illu-results-5:#8fd18a;--illu-results-6:#5ec8ff;--illu-results-7:#b18cff;--illu-results-8:#e9b870;--illu-results-9:#e0766a;--illu-results-10:#6fa2e8;--illu-results-11:#6b716b;--illu-results-12:#5ed0ff;--illu-results-13:#0b2536;--illu-results-14:#bdeeff;--illu-results-15:#c9b6ff;--illu-results-16:#1b1830;--illu-results-17:#d9d4ee;--illu-results-18:#8f5cff;--illu-results-19:#b9e0a8;--illu-results-20:#3f6b3a;--illu-results-21:#9fd08a;--illu-results-22:#2b2320;--illu-results-23:#c9a47a;--illu-results-24:#3a2f2a;--illu-results-25:#6e5a48;--illu-results-26:#3b6fd6;--illu-results-27:#8aa0c8;--illu-results-28:#16263a;--illu-results-29:#3d5a80;--illu-results-30:#9fb4d4;--illu-results-31:#c0564b;--illu-results-32:#a58a4a;--illu-results-33:#6b5a5a;--illu-results-34:#3b82d6;--illu-results-35:#2d5c96;--illu-results-36:#2f8a57;--illu-results-37:#8a8d52;--illu-results-38:#2a2c1c;--illu-results-39:#6b7a6f;--illu-results-40:#8b958e}@media (max-width:1200px){.course-root{--gutter:var(--space-6);--section-y:var(--space-7);--section-y-compact:var(--space-6)}}@media (max-width:900px){.course-root{--grid-gap:var(--space-4);--header-h:3.5rem}}@media (max-width:650px){.course-root{--gutter:var(--space-4);--section-head-gap:var(--space-5)}}
.course-root{font:16px/1.5 var(--ds-font-sans);color:var(--color-ink);background:var(--color-canvas);min-height:100vh}.course-root :where(h1,h2,h3,h4,h5,h6){font-size:revert;font-weight:revert;margin:revert}.course-root :where(p,ul,ol,dl,figure,blockquote,menu){margin:revert;padding:revert}.course-root :where(ul,ol){list-style:revert}.course-root :where(img,svg,video,canvas){display:revert}.course-root :where(img,video){max-width:revert;height:revert}.course-root :where(button,input,select,textarea){font:revert;color:revert;letter-spacing:revert}.course-root :where(input,select,textarea){border:revert;background-color:revert;border-radius:revert;padding:revert}.course-root :where(button){cursor:pointer}.course-root :where(a){color:inherit}.course-root :where(:focus-visible){outline:var(--focus-ring-width) solid var(--focus-ring-color);outline-offset:var(--focus-ring-offset)}.course-root [id]{scroll-margin-top:calc(var(--header-h) + var(--space-4))}.band{padding-block:var(--section-y)}.band--light{background:var(--color-canvas);color:var(--color-ink)}.band--dark{background:var(--gradient-dark);color:var(--color-on-dark);--focus-ring-color:var(--color-on-dark)}.band--compact{padding-block:var(--section-y-compact)}.band__inner{width:min(100% - 2 * var(--gutter), var(--container-max));margin-inline:auto}.band__inner>*+*{margin-top:var(--section-y)}.band--airy{padding-block:calc(var(--section-y) + var(--space-6))}.band__inner>.c-hero+*{margin-top:calc(var(--section-y) + var(--space-6))}.band__inner>.c-tariffs+.c-choice{margin-top:var(--section-head-gap)}@media (max-width:650px){.band--airy{padding-block:calc(var(--section-y) + var(--space-4))}.band__inner>.c-hero+*{margin-top:calc(var(--section-y) + var(--space-4))}}.sec-head{justify-content:space-between;align-items:flex-end;gap:var(--space-4);margin-bottom:var(--section-head-gap);flex-wrap:wrap;display:flex}.sec-kick{font-size:var(--text-xs);letter-spacing:.1em;text-transform:uppercase;color:var(--color-accent);font-weight:700;display:block}.band--dark .sec-kick{color:var(--color-accent-strong)}.sec-title{margin:var(--space-2) 0 0;letter-spacing:-.02em;text-wrap:balance;font-size:2rem;font-weight:700;line-height:1.15}.sec-sub{margin:var(--space-3) 0 0;max-width:var(--measure);color:var(--color-muted)}.band--dark .sec-sub{color:var(--color-muted-on-dark)}@media (max-width:650px){.sec-title{font-size:1.5rem}}.stub-tag{font-size:var(--text-xs);border-radius:var(--radius-pill);color:var(--color-muted);white-space:nowrap;border:1px dashed;padding:2px 10px;font-weight:600;display:inline-block}.band--dark .stub-tag{color:var(--color-muted-on-dark)}.stub-block{gap:var(--space-2);padding:var(--space-5);border:1px dashed var(--color-border);border-radius:var(--radius-lg);color:var(--color-muted);display:grid}.band--dark .stub-block{border-color:color-mix(in srgb, var(--color-on-dark) 22%, transparent);color:var(--color-muted-on-dark)}.stub-block strong{color:var(--color-ink)}.band--dark .stub-block strong{color:var(--color-on-dark)}.course-facts{padding:var(--space-3) var(--space-3) var(--space-3) var(--space-5);border-radius:var(--radius-lg);border:1px solid color-mix(in srgb, var(--color-on-dark) 18%, transparent);justify-content:space-between;align-items:center;gap:var(--space-3) var(--space-5);font-size:var(--text-base);color:var(--color-muted-on-dark);flex-wrap:wrap;display:flex}.course-facts ul{gap:var(--space-2) 0;flex-wrap:wrap;margin:0;padding:0;display:flex}.course-facts li{padding-inline:var(--space-3);list-style:none}.course-facts li+li{border-left:1px solid color-mix(in srgb, var(--color-on-dark) 22%, transparent)}.course-facts li:first-child{padding-left:0}.course-facts b{color:var(--color-on-dark)}@media (max-width:650px){.course-facts{padding:var(--space-4)}.course-facts ul{flex-basis:100%}.course-facts li{flex-basis:100%;padding:0;border:0!important}}.c-btn{justify-content:center;align-items:center;gap:var(--space-2);min-height:48px;padding:var(--space-3) var(--space-5);border-radius:var(--radius-md);color:inherit;font:700 15px/1.2 var(--ds-font-sans);cursor:pointer;white-space:nowrap;background:0 0;border:1.5px solid;text-decoration:none;display:inline-flex}.c-btn:hover{background:var(--color-ink);border-color:var(--color-ink);color:var(--color-on-dark)}.band--dark .c-btn:hover{background:var(--color-on-dark);border-color:var(--color-on-dark);color:var(--color-ink)}.c-btn--primary{background:var(--color-red);border-color:var(--color-red);color:var(--course-white)}.c-btn--primary:hover,.band--dark .c-btn--primary:hover{background:var(--color-red-hover);border-color:var(--color-red-hover);color:var(--course-white)}.c-btn[disabled],.c-btn[aria-disabled=true]{background:var(--disabled-bg);border-color:var(--disabled-bg);color:var(--disabled-ink);cursor:not-allowed}.course-header{z-index:30;height:var(--header-h);background:var(--color-card);border-bottom:1px solid var(--color-border);position:sticky;top:0}.course-header__inner{height:100%;width:min(100% - 2 * var(--gutter), var(--container-max));justify-content:space-between;align-items:center;gap:var(--space-5);margin-inline:auto;display:flex}.course-header__brand{letter-spacing:-.01em;min-height:44px;color:var(--color-ink);white-space:nowrap;align-items:center;gap:6px;font-weight:700;text-decoration:none;display:inline-flex}.course-header__logo{width:auto;height:24px;display:block}.course-header__nav{gap:var(--space-5);font-size:var(--text-sm);display:flex}.course-header__nav a{color:var(--color-muted);text-decoration:none}.course-header__nav a:hover{color:var(--color-ink)}.course-header__cta{min-height:44px;padding-block:var(--space-2)}.course-header__menu{display:none}@media (max-width:900px){.course-header__nav{display:none}.course-header__nav[data-open=true]{top:var(--header-h);padding:var(--space-2) var(--gutter) var(--space-4);background:var(--color-card);border-bottom:1px solid var(--color-border);font-size:var(--text-base);gap:0;display:grid;position:absolute;left:0;right:0}.course-header__nav[data-open=true] a{padding:var(--space-3) 0;min-height:44px}.course-header__menu{border:1px solid var(--color-border);border-radius:var(--radius-md);width:44px;height:44px;color:var(--color-ink);background:0 0;justify-content:center;align-items:center;display:inline-flex}}@media (max-width:400px){.course-header__inner{gap:var(--space-2)}.course-header__brand{font-size:var(--text-sm)}.course-header__logo{height:20px}.course-header__cta{padding-inline:var(--space-3);font-size:var(--text-sm)}}