:root{--duo-green: #58cc02;--duo-green-dark: #46a302;--duo-green-light: #d7ffb8;--duo-blue: #1cb0f6;--duo-blue-dark: #1899d6;--duo-blue-light: #ddf4ff;--duo-yellow: #ffc800;--duo-yellow-dark: #e5b400;--duo-yellow-light: #fff4cc;--duo-orange: #ff9600;--duo-orange-dark: #e68600;--duo-orange-light: #ffe5c2;--duo-red: #ff4b4b;--duo-red-dark: #ea2b2b;--duo-red-light: #ffd6d6;--duo-purple: #ce82ff;--duo-purple-dark: #a855f7;--duo-purple-light: #f3e8ff;--duo-pink: #ff6bb5;--duo-pink-dark: #e84d9a;--duo-pink-light: #ffe0f0;--color-primary: var(--duo-green);--color-primary-dark: var(--duo-green-dark);--color-primary-light: var(--duo-green-light);--color-primary-hover: #61d804;--color-secondary: var(--duo-blue);--color-secondary-dark: var(--duo-blue-dark);--color-secondary-light: var(--duo-blue-light);--color-accent: var(--duo-orange);--color-accent-dark: var(--duo-orange-dark);--color-accent-light: var(--duo-orange-light);--color-text: #3c3c3c;--color-text-muted: #777777;--color-text-soft: #afafaf;--color-text-on-primary: #ffffff;--color-bg: #f0f9ff;--color-bg-pattern: #d4e8f7;--color-bg-soft: #ffffff;--color-card: #ffffff;--color-border: #e5e5e5;--color-border-strong: #d8d8d8;--diff-easy: var(--duo-green);--diff-easy-dark: var(--duo-green-dark);--diff-medium: var(--duo-blue);--diff-medium-dark: var(--duo-blue-dark);--diff-hard: var(--duo-orange);--diff-hard-dark: var(--duo-orange-dark);--diff-expert: var(--duo-red);--diff-expert-dark: var(--duo-red-dark);--radius-sm: 10px;--radius-md: 16px;--radius-lg: 20px;--radius-xl: 28px;--radius-pill: 999px;--border-width-3d: 3px;--shadow-3d-green: 0 var(--border-width-3d) 0 var(--duo-green-dark);--shadow-3d-blue: 0 var(--border-width-3d) 0 var(--duo-blue-dark);--shadow-3d-orange: 0 var(--border-width-3d) 0 var(--duo-orange-dark);--shadow-3d-yellow: 0 var(--border-width-3d) 0 var(--duo-yellow-dark);--shadow-3d-red: 0 var(--border-width-3d) 0 var(--duo-red-dark);--shadow-3d-purple: 0 var(--border-width-3d) 0 var(--duo-purple-dark);--shadow-3d-gray: 0 var(--border-width-3d) 0 #d8d8d8;--shadow-3d-green-active: 0 1px 0 var(--duo-green-dark);--shadow-3d-blue-active: 0 1px 0 var(--duo-blue-dark);--shadow-3d-gray-active: 0 1px 0 #d8d8d8;--shadow-card: 0 2px 0 var(--color-border-strong);--shadow-card-hover: 0 6px 0 var(--color-border-strong);--shadow-float: 0 8px 24px rgba(28, 176, 246, .15);--font-family-base: "Nunito", system-ui, -apple-system, sans-serif;--font-family-display: "Nunito", system-ui, sans-serif;--container-max: 1180px;--header-height: 72px}*,*:before,*:after{box-sizing:border-box}html,body,h1,h2,h3,h4,h5,h6,p,figure,blockquote,dl,dd{margin:0;padding:0}ul[role=list],ol[role=list]{list-style:none}html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}body{min-height:100vh;line-height:1.5;background-color:var(--color-bg);color:var(--color-text);font-family:var(--font-family-base);font-weight:700;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}h1,h2,h3,h4{font-family:var(--font-family-display);font-weight:900;color:var(--color-text);line-height:1.15}a{text-decoration:none;color:inherit}img,picture,video,svg{display:block;max-width:100%}canvas{display:block;max-width:none}input,button,textarea,select{font:inherit;color:inherit;background:none;border:none;padding:0;margin:0;outline:none;appearance:none}button{cursor:pointer}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid var(--duo-blue);outline-offset:3px;border-radius:var(--radius-sm)}@media (prefers-reduced-motion: reduce){html:focus-within{scroll-behavior:auto}*,*:before,*:after{animation-duration:0s!important;animation-iteration-count:1!important;transition-duration:0s!important;scroll-behavior:auto!important}}textarea{resize:vertical}html,body{overflow-x:hidden}.btn-duo{display:inline-flex;align-items:center;justify-content:center;gap:10px;padding:14px 24px;border:none;border-radius:var(--radius-pill);font-family:var(--font-family-base);font-weight:800;font-size:15px;line-height:1.2;text-decoration:none;text-transform:uppercase;letter-spacing:.04em;cursor:pointer;transition:transform .08s ease,box-shadow .08s ease,filter .12s ease;user-select:none}.btn-duo:active{transform:translateY(var(--border-width-3d))}.btn-duo--green{background:var(--duo-green);color:var(--color-text-on-primary);box-shadow:var(--shadow-3d-green)}.btn-duo--green:hover{filter:brightness(1.05)}.btn-duo--green:active{box-shadow:var(--shadow-3d-green-active)}.btn-duo--blue{background:var(--duo-blue);color:var(--color-text-on-primary);box-shadow:var(--shadow-3d-blue)}.btn-duo--blue:hover{filter:brightness(1.05)}.btn-duo--blue:active{box-shadow:var(--shadow-3d-blue-active)}.btn-duo--white{background:var(--color-card);color:var(--duo-blue);box-shadow:var(--shadow-3d-gray);border:2px solid var(--color-border)}.btn-duo--white:hover{background:var(--duo-blue-light)}.btn-duo--white:active{box-shadow:var(--shadow-3d-gray-active)}.btn-duo--lg{padding:16px 32px;font-size:16px}.card-duo{background:var(--color-card);border-radius:var(--radius-lg);border:2px solid var(--color-border);box-shadow:var(--shadow-card);transition:transform .15s ease,box-shadow .15s ease}.card-duo:hover{transform:translateY(-3px);box-shadow:var(--shadow-card-hover)}.badge-duo{display:inline-flex;align-items:center;gap:8px;padding:8px 14px;border-radius:var(--radius-pill);font-weight:800;font-size:13px;letter-spacing:.02em;text-transform:uppercase}.badge-duo--green{background:var(--duo-green-light);color:var(--duo-green-dark);border:2px solid var(--duo-green)}.badge-duo--blue{background:var(--duo-blue-light);color:var(--duo-blue-dark);border:2px solid var(--duo-blue)}.section-title-duo{font-family:var(--font-family-display);font-weight:900;font-size:clamp(24px,3vw,32px);color:var(--color-text);letter-spacing:-.02em;margin:0 0 6px}.section-subtitle-duo{color:var(--color-text-muted);font-weight:700;font-size:16px;margin:0}.nav[data-v-559db5ad]{position:sticky;top:0;z-index:100;background:var(--color-card);border-bottom:2px solid var(--color-border);box-shadow:0 2px 0 var(--color-border-strong)}.nav__inner[data-v-559db5ad]{max-width:var(--container-max);margin:0 auto;padding:10px 24px;display:flex;align-items:center;justify-content:space-between;height:var(--header-height);gap:24px;position:relative}.nav__brand[data-v-559db5ad]{display:flex;align-items:center;gap:12px;text-decoration:none;color:inherit;flex-shrink:0}.nav__logo[data-v-559db5ad]{display:inline-flex;align-items:center;justify-content:center;width:44px;height:44px;border-radius:14px;background:var(--duo-green);color:#fff;box-shadow:var(--shadow-3d-green);flex-shrink:0}.nav__brand-text[data-v-559db5ad]{display:flex;flex-direction:column;line-height:1.1}.nav__brand-name[data-v-559db5ad]{font-family:var(--font-family-display);font-weight:900;font-size:22px;color:var(--duo-green-dark);letter-spacing:-.02em}.nav__brand-tag[data-v-559db5ad]{font-size:12px;font-weight:800;color:var(--color-text-muted);text-transform:uppercase;letter-spacing:.04em}.nav__list[data-v-559db5ad]{display:flex;align-items:center;gap:8px;list-style:none;margin:0;padding:0}.nav__link[data-v-559db5ad]{display:inline-flex;align-items:center;padding:10px 18px;font-weight:800;font-size:14px;text-transform:uppercase;letter-spacing:.04em;color:var(--color-text-muted);border-radius:var(--radius-pill);border:2px solid transparent;transition:transform .08s ease,background .12s ease,color .12s ease,box-shadow .08s ease}.nav__link[data-v-559db5ad]:hover{background:var(--duo-blue-light);color:var(--duo-blue-dark)}.is-active .nav__link[data-v-559db5ad]{background:var(--duo-blue);color:#fff;box-shadow:var(--shadow-3d-blue);border-color:transparent}.is-active .nav__link[data-v-559db5ad]:active{transform:translateY(2px);box-shadow:var(--shadow-3d-blue-active)}.nav__toggle[data-v-559db5ad]{display:none;width:44px;height:44px;border-radius:14px;background:var(--color-card);align-items:center;justify-content:center;padding:0;color:var(--color-text);box-shadow:var(--shadow-3d-gray);border:2px solid var(--color-border)}.nav__toggle[data-v-559db5ad]:active{transform:translateY(2px);box-shadow:var(--shadow-3d-gray-active)}@media (max-width: 720px){.nav__inner[data-v-559db5ad]{padding:10px 16px}.nav__toggle[data-v-559db5ad]{display:flex}.nav__brand-tag[data-v-559db5ad]{display:none}.nav__list[data-v-559db5ad]{position:absolute;top:calc(100% + 8px);right:16px;left:16px;flex-direction:column;align-items:stretch;gap:6px;padding:12px;background:var(--color-card);border-radius:var(--radius-lg);border:2px solid var(--color-border);box-shadow:var(--shadow-card-hover);display:none}.nav__list--open[data-v-559db5ad]{display:flex}.nav__link[data-v-559db5ad]{width:100%;justify-content:center;padding:14px 16px;font-size:15px}}.footer[data-astro-cid-gcn2mc3v]{margin-top:auto;background:var(--color-card);border-top:3px solid var(--duo-green);padding:36px 24px;box-shadow:0 -4px 0 var(--duo-green-light)}.footer__inner[data-astro-cid-gcn2mc3v]{max-width:var(--container-max);margin:0 auto;display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:24px}.footer__brand[data-astro-cid-gcn2mc3v]{display:flex;flex-direction:column;gap:4px}.footer__name[data-astro-cid-gcn2mc3v]{font-family:var(--font-family-display);font-weight:900;font-size:20px;color:var(--duo-green-dark);text-transform:uppercase;letter-spacing:.02em}.footer__tag[data-astro-cid-gcn2mc3v]{font-size:13px;font-weight:700;color:var(--color-text-muted)}.footer__nav[data-astro-cid-gcn2mc3v]{display:flex;gap:20px;justify-content:center}.footer__nav[data-astro-cid-gcn2mc3v] a[data-astro-cid-gcn2mc3v]{font-weight:800;font-size:14px;color:var(--duo-blue);text-transform:uppercase;letter-spacing:.03em;transition:color .12s ease,transform .12s ease}.footer__nav[data-astro-cid-gcn2mc3v] a[data-astro-cid-gcn2mc3v]:hover{color:var(--duo-blue-dark);transform:translateY(-1px)}.footer__copy[data-astro-cid-gcn2mc3v]{font-size:13px;font-weight:700;color:var(--color-text-soft);text-align:right}@media (max-width: 720px){.footer__inner[data-astro-cid-gcn2mc3v]{grid-template-columns:1fr;text-align:center}.footer__copy[data-astro-cid-gcn2mc3v]{text-align:center}.footer__nav[data-astro-cid-gcn2mc3v]{flex-wrap:wrap}}html,body{margin:0;width:100%}body{background-color:var(--color-bg);background-image:radial-gradient(circle,var(--color-bg-pattern) 1.5px,transparent 1.5px);background-size:28px 28px;background-attachment:fixed}.page{display:flex;flex-direction:column;min-height:100vh}.page__main{flex:1;width:100%;max-width:var(--container-max);margin:0 auto;padding:32px 24px 56px}.page__main--full{max-width:none;padding:0}@media (max-width: 720px){.page__main{padding:20px 16px 40px}}