:root{--color-white: #ffffff;--color-black: #1e1e1e;--color-gray: #ecedf0;--color-light-gray: #f6f7f9;--color-dark-gray: #e1e3e8;--color-green: #37b26e;--color-red: #fc696d;--color-blue: #537fff;--color-violet: #8e3ef6;--color-orange: #ffa835;--gradient-main: linear-gradient(to right, var(--color-violet), var(--color-red));--background-primary: var(--color-white);--background-secondary: var(--color-light-gray);--text-primary: var(--color-black);--text-tertiary: color-mix(in srgb, var(--color-black) 80%, transparent);--text-quaternary: color-mix(in srgb, var(--color-black) 50%, transparent);--stroke-primary: var(--color-gray);--stroke-secondary: var(--color-dark-gray);--radius-xxs: 4px;--radius-xs: 8px;--radius-sm: 12px;--radius-md: 16px;--radius-lg: 24px;--radius-xl: 32px;--radius-panel: 40px;--shadow-sm: 0 2px 4px rgba(0, 0, 0, .1);--shadow-md: 0 4px 16px rgba(0, 0, 0, .1);--shadow-lg: 0 24px 60px -16px rgba(30, 30, 30, .18);--content: 1120px}*{box-sizing:border-box}[hidden]{display:none!important}html{scroll-behavior:smooth}body{margin:0;background:var(--background-primary);color:var(--text-primary);font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;font-size:17px;line-height:1.6;-webkit-font-smoothing:antialiased}h1,h2,h3{font-weight:600;line-height:1.12;margin:0;letter-spacing:-.02em}p{margin:0}a{color:inherit}.wrap{max-width:var(--content);margin:0 auto;padding:0 24px}.section-title{font-size:clamp(2rem,4.5vw,3rem);letter-spacing:-.03em;max-width:22ch;text-wrap:balance}.section-sub{margin-top:16px;font-size:1.12rem;color:var(--text-tertiary);max-width:58ch}section{padding:64px 0}@media(max-width:720px){section{padding:40px 0}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{animation-duration:.01ms!important;transition-duration:.01ms!important}}.kicker{display:inline-block;font-size:.76rem;font-weight:600;letter-spacing:.07em;text-transform:uppercase;color:var(--color-blue);background:color-mix(in srgb,var(--color-blue) 9%,transparent);border-radius:var(--radius-xl);padding:6px 14px;margin-bottom:18px}.panel{background:var(--background-secondary);border-radius:var(--radius-panel);padding:64px 56px}@media(max-width:880px){.panel{padding:40px 24px;border-radius:var(--radius-lg)}}.mark-wrong{border-bottom:2px solid var(--color-red);background:color-mix(in srgb,var(--color-red) 8%,transparent);border-radius:var(--radius-xxs);padding:0 .08em}.mark-fixed{display:inline-block;background:var(--color-green);color:var(--color-white);border-radius:var(--radius-md);padding:.06em .45em;font-weight:600}.mark-vocab{border-radius:var(--radius-xxs);text-underline-offset:3px;background:color-mix(in srgb,var(--color-blue) 14%,transparent);box-shadow:0 0 0 2px color-mix(in srgb,var(--color-blue) 14%,transparent);text-decoration:underline dotted var(--color-blue)}.mark-vocab--reviewing{background:color-mix(in srgb,var(--color-orange) 18%,transparent);box-shadow:0 0 0 2px color-mix(in srgb,var(--color-orange) 18%,transparent);text-decoration:underline dotted var(--color-orange)}.btn{display:inline-block;font-family:inherit;font-weight:600;font-size:1rem;text-decoration:none;border:none;border-radius:var(--radius-xl);padding:14px 28px;cursor:pointer;transition:top .15s ease,transform .15s ease,filter .15s ease,background .15s ease}@property --glow-angle{syntax: "<angle>"; initial-value: 0deg; inherits: false;}.btn--primary{position:relative;background:var(--color-black);color:var(--color-white)}.btn--primary:before{content:"";position:absolute;inset:-2px;z-index:-1;border-radius:inherit;background:conic-gradient(from var(--glow-angle),var(--color-violet),var(--color-red),var(--color-blue),var(--color-violet));filter:blur(5px);opacity:.55;transition:filter .2s ease;animation:btn-glow-spin 6s linear infinite,btn-glow-breathe 3.2s ease-in-out infinite}@keyframes btn-glow-spin{to{--glow-angle: 360deg}}@keyframes btn-glow-breathe{0%,to{opacity:.4}50%{opacity:.72}}.btn--primary:hover{top:-1px}.btn--primary:hover:before{filter:blur(8px) brightness(1.2)}@media(prefers-reduced-motion:reduce){.btn--primary:before{animation:none;opacity:.5}}.btn--ghost{background:var(--background-secondary);color:var(--text-primary)}.btn--ghost:hover{background:var(--color-gray)}.card{background:var(--background-primary);border:1px solid var(--stroke-primary);border-radius:var(--radius-md);box-shadow:var(--shadow-sm)}.ui-tooltip{display:flex;flex-direction:column;gap:4px;max-width:300px;padding:8px 12px;background:var(--background-primary);border:1px solid var(--stroke-primary);border-radius:var(--radius-sm);box-shadow:var(--shadow-md)}.ui-tooltip__line{display:flex;align-items:center;gap:8px;flex-wrap:wrap;font-size:14px;line-height:18px}.ui-tooltip__strike{color:var(--text-tertiary)}.ui-tooltip__pill{padding:2px 8px;border-radius:var(--radius-md);background:var(--color-green);color:var(--color-white);font-weight:600;font-size:14px;line-height:18px}.ui-tooltip__why{font-size:13px;line-height:18px;color:var(--text-tertiary)}.ui-tooltip__meta{font-size:12px;font-weight:600;color:var(--color-green)}.footer[data-astro-cid-5hce7sga]{border-top:1px solid var(--stroke-primary);padding:40px 0 48px;background:var(--background-secondary)}.footer__inner[data-astro-cid-5hce7sga]{display:flex;flex-wrap:wrap;gap:24px;align-items:baseline;justify-content:space-between}.footer__logo[data-astro-cid-5hce7sga]{font-weight:600;font-size:1.3rem;letter-spacing:-.02em}.footer__tagline[data-astro-cid-5hce7sga]{color:var(--text-quaternary);font-size:.95rem;max-width:34ch}.footer__links[data-astro-cid-5hce7sga]{display:flex;flex-wrap:wrap;gap:18px;font-size:.95rem}.footer__links[data-astro-cid-5hce7sga] a[data-astro-cid-5hce7sga]{color:var(--text-quaternary);text-decoration-thickness:1px;text-underline-offset:3px}.footer__links[data-astro-cid-5hce7sga] a[data-astro-cid-5hce7sga]:hover{color:var(--color-blue)}.footer__copyright[data-astro-cid-5hce7sga]{color:var(--text-quaternary);font-size:.9rem}.langsel[data-astro-cid-nk5ecrne]{position:relative}.langsel__trigger[data-astro-cid-nk5ecrne]{display:inline-flex;align-items:center;gap:8px;padding:7px 10px 7px 12px;background:var(--background-secondary);border-radius:var(--radius-xl);cursor:pointer;user-select:none;list-style:none;transition:color .2s ease}.langsel__trigger[data-astro-cid-nk5ecrne]::-webkit-details-marker{display:none}.langsel__flag[data-astro-cid-nk5ecrne]{font-size:1.05rem;line-height:1}.langsel__name[data-astro-cid-nk5ecrne]{font-weight:600;font-size:.95rem;color:var(--text-tertiary)}.langsel__chevron[data-astro-cid-nk5ecrne]{width:16px;height:16px;color:var(--text-quaternary);transition:transform .2s ease,color .2s ease}.langsel__trigger[data-astro-cid-nk5ecrne]:hover .langsel__name[data-astro-cid-nk5ecrne],.langsel__trigger[data-astro-cid-nk5ecrne]:hover .langsel__chevron[data-astro-cid-nk5ecrne]{color:var(--color-blue)}.langsel[data-astro-cid-nk5ecrne][open] .langsel__chevron[data-astro-cid-nk5ecrne]{transform:rotate(180deg);color:var(--color-blue)}.langsel__menu[data-astro-cid-nk5ecrne]{position:absolute;top:calc(100% + 8px);right:0;z-index:30;min-width:184px;display:flex;flex-direction:column;gap:2px;padding:6px;background:var(--background-primary);border-radius:var(--radius-md);box-shadow:0 4px 20px #1e1e1e26;animation:langsel-in .14s ease-out}@keyframes langsel-in{0%{opacity:0;transform:translateY(-4px)}}.langsel__option[data-astro-cid-nk5ecrne]{display:flex;align-items:center;gap:8px;min-height:36px;padding:7px 12px;border-radius:var(--radius-xs);text-decoration:none;color:var(--text-primary);transition:background-color .2s ease}.langsel__option[data-astro-cid-nk5ecrne]:hover{background:var(--background-secondary)}.langsel__opt-flag[data-astro-cid-nk5ecrne]{font-size:1.2rem;line-height:1;width:24px;text-align:center;flex-shrink:0}.langsel__opt-name[data-astro-cid-nk5ecrne]{flex-grow:1;font-size:.97rem}.langsel__option[data-astro-cid-nk5ecrne].is-selected{background:color-mix(in srgb,var(--color-blue) 5%,transparent 95%)}.langsel__option[data-astro-cid-nk5ecrne].is-selected .langsel__opt-name[data-astro-cid-nk5ecrne]{color:var(--color-blue);font-weight:500}.langsel__check[data-astro-cid-nk5ecrne]{width:18px;height:18px;color:var(--color-blue);flex-shrink:0}@media(max-width:420px){.langsel__name[data-astro-cid-nk5ecrne]{display:none}}.nav[data-astro-cid-dmqpwcec]{position:sticky;top:0;z-index:20;background:color-mix(in srgb,var(--background-primary) 86%,transparent);backdrop-filter:blur(10px);border-bottom:1px solid var(--stroke-primary)}.nav__inner[data-astro-cid-dmqpwcec]{display:flex;align-items:center;gap:28px;padding-top:14px;padding-bottom:14px}.nav__logo[data-astro-cid-dmqpwcec]{display:flex;align-items:center;gap:10px;font-weight:600;font-size:1.25rem;letter-spacing:-.02em;text-decoration:none}.nav__logo[data-astro-cid-dmqpwcec] img[data-astro-cid-dmqpwcec]{height:34px;width:auto;border-radius:8px}.nav__links[data-astro-cid-dmqpwcec]{display:flex;gap:22px;margin-left:12px;font-weight:500;font-size:.98rem}.nav__links[data-astro-cid-dmqpwcec] a[data-astro-cid-dmqpwcec]{text-decoration:none;color:var(--text-tertiary)}.nav__links[data-astro-cid-dmqpwcec] a[data-astro-cid-dmqpwcec]:hover{color:var(--color-blue)}.nav__actions[data-astro-cid-dmqpwcec]{margin-left:auto;display:flex;align-items:center;gap:16px}.nav__login[data-astro-cid-dmqpwcec]{text-decoration:none;font-weight:600;font-size:.95rem;color:var(--text-tertiary)}.nav__login[data-astro-cid-dmqpwcec]:hover{color:var(--color-blue)}.nav__cta[data-astro-cid-dmqpwcec]{padding:10px 20px;font-size:.95rem}@media(max-width:860px){.nav__links[data-astro-cid-dmqpwcec],.nav__login[data-astro-cid-dmqpwcec]{display:none}}