@import"https://fonts.googleapis.com/css2?family=DM+Sans:ital,opsz,wght@0,9..40,300;0,9..40,400;0,9..40,500;0,9..40,600;0,9..40,700;1,9..40,400&family=DM+Serif+Display:ital@0;1&family=Noto+Serif+SC:wght@400;500;600;700&display=swap";:root{--color-primary: hsl(228, 55%, 38%);--color-primary-light: hsl(228, 50%, 52%);--color-primary-lighter: hsl(228, 45%, 93%);--color-primary-dark: hsl(228, 60%, 28%);--color-accent: hsl(40, 90%, 52%);--color-accent-light: hsl(40, 88%, 68%);--color-accent-dark: hsl(40, 85%, 38%);--color-success: hsl(155, 55%, 38%);--color-warning: hsl(40, 90%, 52%);--color-danger: hsl(4, 65%, 48%);--color-bg: hsl(40, 15%, 97%);--color-bg-alt: hsl(40, 12%, 94%);--color-surface: hsl(0, 0%, 100%);--color-surface-hover: hsl(40, 14%, 96%);--color-text: hsl(228, 30%, 12%);--color-text-secondary: hsl(228, 12%, 42%);--color-text-muted: hsl(228, 8%, 58%);--color-border: hsl(228, 12%, 88%);--color-border-light: hsl(228, 12%, 92%);--color-glass: hsla(0, 0%, 100%, .6);--color-glass-border: hsla(228, 30%, 80%, .3);--color-glass-hover: hsla(0, 0%, 100%, .8);--shadow-sm: 0 1px 3px hsla(228, 30%, 10%, .04), 0 1px 2px hsla(228, 30%, 10%, .06);--shadow-md: 0 4px 16px hsla(228, 30%, 10%, .07), 0 2px 4px hsla(228, 30%, 10%, .04);--shadow-lg: 0 12px 40px hsla(228, 30%, 10%, .1), 0 4px 12px hsla(228, 30%, 10%, .05);--shadow-xl: 0 24px 56px hsla(228, 30%, 10%, .14), 0 8px 20px hsla(228, 30%, 10%, .06);--shadow-glow: 0 0 30px hsla(228, 55%, 50%, .15);--font-heading: "DM Serif Display", Georgia, "Times New Roman", serif;--font-body: "DM Sans", system-ui, -apple-system, sans-serif;--font-body-zh: "Noto Serif SC", "DM Sans", system-ui, sans-serif;--font-mono: "JetBrains Mono", ui-monospace, monospace;--text-xs: .75rem;--text-sm: .875rem;--text-base: 1rem;--text-lg: 1.125rem;--text-xl: 1.25rem;--text-2xl: 1.5rem;--text-3xl: 1.875rem;--text-4xl: 2.25rem;--text-5xl: 3rem;--text-6xl: 3.75rem;--text-7xl: 4.5rem;--leading-tight: 1.15;--leading-normal: 1.65;--leading-relaxed: 1.8;--space-1: .25rem;--space-2: .5rem;--space-3: .75rem;--space-4: 1rem;--space-5: 1.25rem;--space-6: 1.5rem;--space-8: 2rem;--space-10: 2.5rem;--space-12: 3rem;--space-16: 4rem;--space-20: 5rem;--space-24: 6rem;--max-width: 1200px;--max-width-narrow: 800px;--header-height: 72px;--radius-sm: 6px;--radius-md: 12px;--radius-lg: 18px;--radius-xl: 28px;--radius-full: 9999px;--ease-out: cubic-bezier(.16, 1, .3, 1);--ease-spring: cubic-bezier(.34, 1.56, .64, 1);--transition-fast: .15s var(--ease-out);--transition-base: .3s var(--ease-out);--transition-slow: .5s var(--ease-out);--gradient-hero: linear-gradient(155deg, hsl(222, 40%, 10%) 0%, hsl(218, 35%, 14%) 45%, hsl(225, 30%, 11%) 100%);--gradient-accent: linear-gradient(135deg, hsl(40, 90%, 52%) 0%, hsl(25, 85%, 50%) 100%);--gradient-card: linear-gradient(180deg, var(--color-surface) 0%, hsl(40, 12%, 98%) 100%)}[data-theme=dark]{--color-primary: hsl(228, 60%, 65%);--color-primary-light: hsl(228, 55%, 75%);--color-primary-lighter: hsl(228, 35%, 16%);--color-primary-dark: hsl(228, 65%, 55%);--color-accent: hsl(40, 85%, 58%);--color-accent-light: hsl(40, 80%, 72%);--color-bg: hsl(228, 22%, 8%);--color-bg-alt: hsl(228, 20%, 11%);--color-surface: hsl(228, 18%, 14%);--color-surface-hover: hsl(228, 18%, 18%);--color-text: hsl(40, 12%, 92%);--color-text-secondary: hsl(228, 10%, 62%);--color-text-muted: hsl(228, 8%, 44%);--color-border: hsl(228, 14%, 22%);--color-border-light: hsl(228, 14%, 18%);--color-glass: hsla(228, 20%, 14%, .6);--color-glass-border: hsla(228, 20%, 30%, .3);--color-glass-hover: hsla(228, 20%, 18%, .8);--shadow-sm: 0 1px 3px hsla(0, 0%, 0%, .2);--shadow-md: 0 4px 16px hsla(0, 0%, 0%, .3);--shadow-lg: 0 12px 40px hsla(0, 0%, 0%, .4);--shadow-xl: 0 24px 56px hsla(0, 0%, 0%, .5);--shadow-glow: 0 0 30px hsla(228, 55%, 50%, .2);--gradient-hero: linear-gradient(155deg, hsl(222, 35%, 6%) 0%, hsl(218, 30%, 9%) 45%, hsl(225, 28%, 7%) 100%);--gradient-card: linear-gradient(180deg, var(--color-surface) 0%, hsl(228, 18%, 12%) 100%)}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}body{font-family:var(--font-body);font-size:var(--text-base);line-height:var(--leading-normal);color:var(--color-text);background-color:var(--color-bg);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;min-height:100dvh}html[lang=zh] body,html[lang=zh-CN] body{font-family:var(--font-body-zh)}img,picture,video,canvas,svg{display:block;max-width:100%}a{color:var(--color-primary);text-decoration:none;transition:color var(--transition-fast)}a:hover{color:var(--color-primary-light)}h1,h2,h3,h4,h5,h6{font-family:var(--font-heading);font-weight:400;line-height:var(--leading-tight);color:var(--color-text);letter-spacing:-.01em}h1{font-size:var(--text-4xl)}h2{font-size:var(--text-3xl)}h3{font-size:var(--text-2xl)}h4{font-size:var(--text-xl)}h5{font-size:var(--text-lg)}@media(min-width:768px){h1{font-size:var(--text-5xl)}h2{font-size:var(--text-4xl)}h3{font-size:var(--text-3xl)}}.container{width:100%;max-width:var(--max-width);margin-inline:auto;padding-inline:var(--space-6)}.container--narrow{max-width:var(--max-width-narrow)}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}@keyframes fadeSlideUp{0%{opacity:0;transform:translateY(24px)}to{opacity:1;transform:translateY(0)}}@keyframes fadeSlideIn{0%{opacity:0;transform:translate(-16px)}to{opacity:1;transform:translate(0)}}@keyframes shimmer{0%{background-position:-200% 0}to{background-position:200% 0}}@keyframes float{0%,to{transform:translateY(0)}50%{transform:translateY(-6px)}}@keyframes pulseGlow{0%,to{box-shadow:0 0 #3955c633}50%{box-shadow:0 0 20px 4px #3955c61a}}@keyframes gradientShift{0%{background-position:0% 50%}50%{background-position:100% 50%}to{background-position:0% 50%}}.animate-in{animation:fadeSlideUp .6s var(--ease-out) both}.stagger-children>*{animation:fadeSlideUp .5s var(--ease-out) both}.stagger-children>*:nth-child(1){animation-delay:0ms}.stagger-children>*:nth-child(2){animation-delay:60ms}.stagger-children>*:nth-child(3){animation-delay:.12s}.stagger-children>*:nth-child(4){animation-delay:.18s}.stagger-children>*:nth-child(5){animation-delay:.24s}.stagger-children>*:nth-child(6){animation-delay:.3s}.stagger-children>*:nth-child(n+7){animation-delay:.36s}.badge{display:inline-flex;align-items:center;gap:var(--space-1);padding:var(--space-1) var(--space-3);font-size:var(--text-xs);font-weight:600;font-family:var(--font-body);text-transform:uppercase;letter-spacing:.05em;border-radius:var(--radius-full);white-space:nowrap}.badge--easy{background:#e0f5ec;color:#1d724f}.badge--moderate{background:#fcf0d9;color:#7d5912}.badge--challenging{background:#f8e4e2;color:#96332c}[data-theme=dark] .badge--easy{background:#173026;color:#6ecfa6}[data-theme=dark] .badge--moderate{background:#302817;color:#d8b164}[data-theme=dark] .badge--challenging{background:#301917;color:#cf746e}.badge--left{background:var(--color-primary-lighter);color:var(--color-primary)}.badge--right{background:#eee1f4;color:#6f358d}[data-theme=dark] .badge--left{background:#1b2037;color:#7c90de}[data-theme=dark] .badge--right{background:#2d1d35;color:#ba89d2}.prose{max-width:72ch;line-height:var(--leading-relaxed);font-size:var(--text-base)}.prose h2{margin-top:var(--space-12);margin-bottom:var(--space-5);padding-bottom:var(--space-3);border-bottom:2px solid var(--color-border-light);font-size:var(--text-3xl)}.prose h3{margin-top:var(--space-10);margin-bottom:var(--space-3);font-size:var(--text-2xl)}.prose p{margin-bottom:var(--space-5);color:var(--color-text-secondary)}.prose ul,.prose ol{margin-bottom:var(--space-5);padding-left:var(--space-6)}.prose li{margin-bottom:var(--space-2);color:var(--color-text-secondary)}.prose li::marker{color:var(--color-accent)}.prose strong{font-weight:600;color:var(--color-text)}.prose blockquote{margin:var(--space-8) 0;padding:var(--space-5) var(--space-6);border-left:4px solid var(--color-accent);background:var(--color-bg-alt);border-radius:0 var(--radius-md) var(--radius-md) 0;font-style:italic;color:var(--color-text-secondary)}.prose table{width:100%;margin:var(--space-8) 0;border-collapse:collapse;border-radius:var(--radius-md);overflow:hidden}.prose th,.prose td{padding:var(--space-3) var(--space-4);text-align:left;border-bottom:1px solid var(--color-border)}.prose th{font-weight:600;background:var(--color-bg-alt);font-family:var(--font-body);font-size:var(--text-sm);text-transform:uppercase;letter-spacing:.04em;color:var(--color-text-muted)}.header[data-astro-cid-qlfjksao]{position:sticky;top:0;z-index:100;height:var(--header-height);background:#f8f8f6cc;backdrop-filter:blur(20px) saturate(180%);-webkit-backdrop-filter:blur(20px) saturate(180%);border-bottom:1px solid var(--color-border-light);transition:all var(--transition-base)}[data-theme=dark] .header[data-astro-cid-qlfjksao]{background:#101219cc}.header__inner[data-astro-cid-qlfjksao]{display:flex;align-items:center;justify-content:space-between;height:100%;gap:var(--space-8)}.header__logo[data-astro-cid-qlfjksao]{display:flex;align-items:center;gap:var(--space-3);color:var(--color-text);font-family:var(--font-heading);font-weight:400;font-size:var(--text-xl);text-decoration:none;flex-shrink:0}.header__logo[data-astro-cid-qlfjksao]:hover{color:var(--color-text)}.header__logo-globe[data-astro-cid-qlfjksao]{display:flex;align-items:center;justify-content:center;transition:transform .5s var(--ease-spring)}.header__logo[data-astro-cid-qlfjksao]:hover .header__logo-globe[data-astro-cid-qlfjksao]{transform:rotate(20deg) scale(1.1)}.header__logo-icon[data-astro-cid-qlfjksao]{color:var(--color-primary)}.header__logo-text[data-astro-cid-qlfjksao]{letter-spacing:-.02em}.header__logo-dot[data-astro-cid-qlfjksao]{color:var(--color-accent)}.header__nav[data-astro-cid-qlfjksao]{display:none;align-items:center;gap:var(--space-1)}@media(min-width:768px){.header__nav[data-astro-cid-qlfjksao]{display:flex}}.header__nav-link[data-astro-cid-qlfjksao]{position:relative;padding:var(--space-2) var(--space-4);font-size:var(--text-sm);font-weight:500;color:var(--color-text-secondary);text-decoration:none;border-radius:var(--radius-sm);transition:all var(--transition-fast);overflow:hidden}.header__nav-link[data-astro-cid-qlfjksao]:after{content:"";position:absolute;bottom:4px;left:var(--space-4);right:var(--space-4);height:2px;background:var(--color-accent);border-radius:1px;transform:scaleX(0);transform-origin:left;transition:transform .3s var(--ease-out)}.header__nav-link[data-astro-cid-qlfjksao]:hover{color:var(--color-text)}.header__nav-link[data-astro-cid-qlfjksao]:hover:after{transform:scaleX(1)}.header__nav-link--active[data-astro-cid-qlfjksao]{color:var(--color-primary)}.header__nav-link--active[data-astro-cid-qlfjksao]:after{transform:scaleX(1);background:var(--color-primary)}.header__actions[data-astro-cid-qlfjksao]{display:flex;align-items:center;gap:var(--space-2)}.header__lang-btn[data-astro-cid-qlfjksao]{padding:var(--space-1) var(--space-3);font-size:var(--text-sm);font-weight:600;color:var(--color-text-secondary);text-decoration:none;border:1.5px solid var(--color-border);border-radius:var(--radius-full);transition:all var(--transition-fast)}.header__lang-btn[data-astro-cid-qlfjksao]:hover{color:var(--color-primary);border-color:var(--color-primary);background:var(--color-primary-lighter);transform:translateY(-1px)}.header__theme-btn[data-astro-cid-qlfjksao]{display:flex;align-items:center;justify-content:center;width:36px;height:36px;background:none;border:none;border-radius:var(--radius-md);color:var(--color-text-secondary);cursor:pointer;transition:all var(--transition-fast)}.header__theme-btn[data-astro-cid-qlfjksao]:hover{color:var(--color-accent);background:var(--color-surface-hover);transform:rotate(15deg)}[data-theme=light] .header__icon--moon[data-astro-cid-qlfjksao],[data-theme=dark] .header__icon--sun[data-astro-cid-qlfjksao]{display:none}.header__menu-btn[data-astro-cid-qlfjksao]{display:flex;flex-direction:column;justify-content:center;align-items:center;gap:5px;width:36px;height:36px;background:none;border:none;cursor:pointer;padding:6px;z-index:110}@media(min-width:768px){.header__menu-btn[data-astro-cid-qlfjksao]{display:none}}.header__menu-bar[data-astro-cid-qlfjksao]{display:block;width:20px;height:2px;background:var(--color-text);border-radius:2px;transition:all .35s var(--ease-out);transform-origin:center}.menu-open .header__menu-bar[data-astro-cid-qlfjksao]:nth-child(1){transform:translateY(7px) rotate(45deg)}.menu-open .header__menu-bar[data-astro-cid-qlfjksao]:nth-child(2){opacity:0;transform:scaleX(0)}.menu-open .header__menu-bar[data-astro-cid-qlfjksao]:nth-child(3){transform:translateY(-7px) rotate(-45deg)}.header__mobile-overlay[data-astro-cid-qlfjksao]{position:fixed;inset:0;z-index:99;background:#0e111bf2;backdrop-filter:blur(24px);-webkit-backdrop-filter:blur(24px);align-items:center;justify-content:center;transition:opacity .4s var(--ease-out),visibility .4s var(--ease-out)}.menu-open .header__mobile-overlay[data-astro-cid-qlfjksao]{display:flex!important;opacity:1!important;visibility:visible!important}.header__mobile-nav[data-astro-cid-qlfjksao]{display:flex;flex-direction:column;align-items:center;gap:var(--space-8)}.header__mobile-link[data-astro-cid-qlfjksao]{font-family:var(--font-heading);font-size:var(--text-3xl);color:#ffffffb3;text-decoration:none;transition:all var(--transition-base);transform:translateY(20px);opacity:0}.menu-open .header__mobile-link[data-astro-cid-qlfjksao]{transform:translateY(0);opacity:1}.menu-open .header__mobile-link[data-astro-cid-qlfjksao]:nth-child(1){transition-delay:.1s}.menu-open .header__mobile-link[data-astro-cid-qlfjksao]:nth-child(2){transition-delay:.15s}.menu-open .header__mobile-link[data-astro-cid-qlfjksao]:nth-child(3){transition-delay:.2s}.menu-open .header__mobile-link[data-astro-cid-qlfjksao]:nth-child(4){transition-delay:.25s}.header__mobile-link[data-astro-cid-qlfjksao]:hover,.header__mobile-link--active[data-astro-cid-qlfjksao]{color:#fff}.header__mobile-link--active[data-astro-cid-qlfjksao]:after{content:"";display:block;width:40px;height:3px;background:var(--color-accent);margin:var(--space-2) auto 0;border-radius:2px}@media(min-width:768px){.header__mobile-overlay[data-astro-cid-qlfjksao]{display:none}}.footer[data-astro-cid-35ed7um5]{position:relative;margin-top:var(--space-20);padding:var(--space-16) 0 var(--space-8);background:var(--color-bg-alt)}.footer__accent-line[data-astro-cid-35ed7um5]{position:absolute;top:0;left:0;right:0;height:3px;background:linear-gradient(90deg,var(--color-primary) 0%,var(--color-accent) 50%,var(--color-primary) 100%);background-size:200% 100%;animation:gradientShift 6s ease-in-out infinite}.footer__grid[data-astro-cid-35ed7um5]{display:grid;grid-template-columns:1fr;gap:var(--space-10)}@media(min-width:768px){.footer__grid[data-astro-cid-35ed7um5]{grid-template-columns:2fr 1fr 1fr}}.footer__logo[data-astro-cid-35ed7um5]{display:inline-flex;align-items:center;gap:var(--space-2);font-family:var(--font-heading);font-weight:400;font-size:var(--text-xl);color:var(--color-text);text-decoration:none;transition:all var(--transition-base)}.footer__logo[data-astro-cid-35ed7um5]:hover{color:var(--color-primary)}.footer__logo[data-astro-cid-35ed7um5] svg[data-astro-cid-35ed7um5]{color:var(--color-primary);transition:transform .5s var(--ease-spring)}.footer__logo[data-astro-cid-35ed7um5]:hover svg[data-astro-cid-35ed7um5]{transform:rotate(15deg)}.footer__logo-dot[data-astro-cid-35ed7um5]{color:var(--color-accent)}.footer__tagline[data-astro-cid-35ed7um5]{margin-top:var(--space-4);color:var(--color-text-secondary);font-size:var(--text-sm);max-width:300px;line-height:var(--leading-relaxed)}.footer__heading[data-astro-cid-35ed7um5]{font-family:var(--font-body);font-size:var(--text-xs);font-weight:600;text-transform:uppercase;letter-spacing:.08em;color:var(--color-text-muted);margin-bottom:var(--space-5)}.footer__links[data-astro-cid-35ed7um5]{list-style:none;padding:0;display:flex;flex-direction:column;gap:var(--space-3)}.footer__links[data-astro-cid-35ed7um5] a[data-astro-cid-35ed7um5]{display:inline-flex;align-items:center;gap:var(--space-2);color:var(--color-text-secondary);font-size:var(--text-sm);text-decoration:none;transition:all var(--transition-fast)}.footer__links[data-astro-cid-35ed7um5] a[data-astro-cid-35ed7um5]:before{content:"";display:inline-block;width:0;height:1.5px;background:var(--color-accent);border-radius:1px;transition:width .3s var(--ease-out)}.footer__links[data-astro-cid-35ed7um5] a[data-astro-cid-35ed7um5]:hover{color:var(--color-primary);transform:translate(4px)}.footer__links[data-astro-cid-35ed7um5] a[data-astro-cid-35ed7um5]:hover:before{width:12px}.footer__bottom[data-astro-cid-35ed7um5]{margin-top:var(--space-12);padding-top:var(--space-6);border-top:1px solid var(--color-border);text-align:center}.footer__copyright[data-astro-cid-35ed7um5]{font-size:var(--text-xs);color:var(--color-text-muted);letter-spacing:.02em}.cookie-consent[data-astro-cid-qfmkaqek]{position:fixed;bottom:0;left:0;right:0;z-index:9999;background:var(--color-surface, #1a1a2e);border-top:1px solid var(--color-border-light, hsla(0, 0%, 100%, .1));backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);animation:slideUp .4s ease-out}@keyframes slideUp{0%{transform:translateY(100%);opacity:0}to{transform:translateY(0);opacity:1}}.cookie-consent__inner[data-astro-cid-qfmkaqek]{max-width:1200px;margin:0 auto;padding:1rem 1.5rem;display:flex;align-items:center;justify-content:space-between;gap:1.5rem;flex-wrap:wrap}.cookie-consent__text[data-astro-cid-qfmkaqek]{flex:1;min-width:260px}.cookie-consent__text[data-astro-cid-qfmkaqek] p[data-astro-cid-qfmkaqek]{margin:0;font-size:.875rem;line-height:1.6;color:var(--color-text-secondary, #b0b0c0)}.cookie-consent__text[data-astro-cid-qfmkaqek] a[data-astro-cid-qfmkaqek]{color:var(--color-accent, #e6a817);text-decoration:underline;text-underline-offset:2px}.cookie-consent__actions[data-astro-cid-qfmkaqek]{display:flex;gap:.75rem;flex-shrink:0}.cookie-btn[data-astro-cid-qfmkaqek]{padding:.5rem 1.25rem;border-radius:6px;font-size:.8125rem;font-weight:600;cursor:pointer;border:none;transition:background .2s,color .2s,box-shadow .2s;white-space:nowrap}.cookie-btn--primary[data-astro-cid-qfmkaqek]{background:var(--color-accent, #e6a817);color:#000}.cookie-btn--primary[data-astro-cid-qfmkaqek]:hover{background:var(--color-accent-light, #f0be3e);box-shadow:0 2px 8px #e8ba304d}.cookie-btn--secondary[data-astro-cid-qfmkaqek]{background:transparent;color:var(--color-text-secondary, #b0b0c0);border:1px solid var(--color-border, hsla(0, 0%, 100%, .15))}.cookie-btn--secondary[data-astro-cid-qfmkaqek]:hover{background:#ffffff0d;color:var(--color-text, #eee)}@media(max-width:640px){.cookie-consent__inner[data-astro-cid-qfmkaqek]{flex-direction:column;text-align:center}.cookie-consent__actions[data-astro-cid-qfmkaqek]{width:100%;justify-content:center}}