:root{--color-bg:#f8f4e8;--color-bg-alt:#f0ebe0;--color-bg-card:#fffdf7;--color-text:#3d3831;--color-text-muted:#6b6357;--color-text-light:#8a8279;--color-heading:#2c2620;--color-link:#8b4513;--color-link-hover:#a0522d;--color-border:#d4c9b5;--color-border-light:#e8e0d0;--color-accent:#8b4513;--color-accent-light:#deb887;--color-timeline:#c9b896;--color-timeline-dot:#8b4513;--color-tag-bg:#e8dcc8;--color-tag-text:#5c4b35;--color-shadow:rgba(60, 50, 40, 0.1);--color-overlay:rgba(248, 244, 232, 0.9);--font-heading:system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;--font-body:system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;--font-mono:'Fira Code', 'Consolas', monospace;--spacing-xs:0.25rem;--spacing-sm:0.5rem;--spacing-md:1rem;--spacing-lg:1.5rem;--spacing-xl:2rem;--spacing-2xl:3rem;--spacing-3xl:4rem;--container-max:1200px;--container-narrow:960px;--header-height:70px;--footer-height:auto;--timeline-width:4px;--timeline-dot:14px;--border-radius-sm:4px;--border-radius-md:8px;--border-radius-lg:12px;--transition-fast:0.15s ease;--transition-normal:0.3s ease;--transition-slow:0.5s ease}[data-theme=dark]{--color-bg:#1a1612;--color-bg-alt:#252019;--color-bg-card:#2d2720;--color-text:#e0d8c8;--color-text-muted:#a89f8f;--color-text-light:#7a7165;--color-heading:#f0e8d8;--color-link:#d4a574;--color-link-hover:#e8b888;--color-border:#4a4035;--color-border-light:#3a3228;--color-accent:#d4a574;--color-accent-light:#8b6944;--color-timeline:#5a4a35;--color-timeline-dot:#d4a574;--color-tag-bg:#3a3228;--color-tag-text:#d4c8b0;--color-shadow:rgba(0, 0, 0, 0.3);--color-overlay:rgba(26, 22, 18, 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var(--spacing-lg)}@media(max-width:576px){.container{padding:0 var(--spacing-md)}}.header-image{position:relative;width:100%;height:200px;max-width:var(--container-max);margin-left:auto;margin-right:auto;padding:0 var(--spacing-lg);background-size:cover;background-position:50%;display:flex;align-items:center;justify-content:center;border-radius:var(--border-radius-lg);overflow:hidden}.header-image .header-image-overlay{position:absolute;inset:0;background:linear-gradient(to bottom,rgba(0,0,0,.2),rgba(0,0,0,.4))}@media(max-width:768px){.header-image{height:150px;border-radius:var(--border-radius-md)}}.site-main{flex:1;padding:var(--spacing-2xl)0}@media(max-width:576px){.site-main{padding:var(--spacing-xl)0}}.main-header{text-align:center;margin-bottom:var(--spacing-2xl);padding-bottom:var(--spacing-xl);border-bottom:1px solid var(--color-border-light)}.main-header .page-title{font-size:2.5rem;margin-bottom:var(--spacing-sm)}@media(max-width:576px){.main-header .page-title{font-size:2rem}}.main-header .page-description{color:var(--color-text-muted);font-size:1.125rem}.site-header{position:sticky;top:0;z-index:1000;background-color:var(--color-bg);border-bottom:1px solid var(--color-border);height:var(--header-height);transition:background-color var(--transition-normal)}.header-container{display:flex;align-items:center;justify-content:space-between;max-width:var(--container-max);margin:0 auto;padding:0 var(--spacing-lg);height:100%}.header-brand .site-logo{display:flex;align-items:center}.header-brand .site-logo .logo-text{font-family:var(--font-heading);font-size:1.5rem;font-weight:600;color:var(--color-heading)}.header-brand .site-logo .logo-image{height:40px;width:auto}.header-right{display:flex;align-items:center;gap:var(--spacing-lg)}@media(max-width:768px){.header-right{gap:var(--spacing-sm)}}.header-nav{display:flex;align-items:center}@media(max-width:768px){.header-nav{position:fixed;top:var(--header-height);left:0;right:0;background-color:var(--color-bg);border-bottom:1px solid var(--color-border);padding:var(--spacing-lg);transform:translateY(-100%);opacity:0;visibility:hidden;transition:all var(--transition-normal)}.header-nav.is-open{transform:translateY(0);opacity:1;visibility:visible}}.nav-menu{display:flex;list-style:none;gap:var(--spacing-lg)}@media(max-width:768px){.nav-menu{flex-direction:column;gap:var(--spacing-md)}}.nav-item .nav-link{font-family:var(--font-heading);font-size:1rem;color:var(--color-text);padding:var(--spacing-sm)var(--spacing-xs);position:relative;transition:color var(--transition-fast)}.nav-item .nav-link::after{content:'';position:absolute;bottom:-2px;left:0;width:0;height:2px;background-color:var(--color-accent);transition:width var(--transition-normal)}.nav-item .nav-link:hover{color:var(--color-accent)}.nav-item .nav-link:hover::after{width:100%}.nav-item .nav-link.active{color:var(--color-accent);font-weight:600}.nav-item .nav-link.active::after{width:100%}.header-actions{display:flex;align-items:center;gap:var(--spacing-sm)}.language-switcher{position:relative}.language-switcher .lang-toggle{background:0 0;border:none;cursor:pointer;color:var(--color-text);padding:var(--spacing-sm);display:flex;align-items:center;gap:var(--spacing-sm)}.language-switcher .lang-toggle:hover{color:var(--color-accent)}.language-switcher .lang-menu{position:absolute;top:100%;right:50%;transform:translateX(50%)translateY(-10px);background:var(--color-bg-card);border:1px solid var(--color-border);border-radius:var(--border-radius-md);padding:var(--spacing-sm);list-style:none;min-width:160px;white-space:nowrap;opacity:0;visibility:hidden;transition:all var(--transition-fast);box-shadow:0 4px 12px var(--color-shadow)}.language-switcher .lang-menu li a{display:block;padding:var(--spacing-sm)var(--spacing-md);color:var(--color-text);border-radius:var(--border-radius-sm)}.language-switcher .lang-menu li a:hover,.language-switcher .lang-menu li a.active{background:var(--color-bg-alt);color:var(--color-accent)}.language-switcher:hover .lang-menu,.language-switcher.is-open .lang-menu{opacity:1;visibility:visible;transform:translateX(50%)translateY(0)}.theme-toggle{background:0 0;border:none;cursor:pointer;color:var(--color-text);padding:var(--spacing-sm);display:flex;align-items:center}.theme-toggle:hover{color:var(--color-accent)}.theme-toggle .sun-icon{display:block}.theme-toggle .moon-icon{display:none}[data-theme=dark] .theme-toggle .sun-icon{display:none}[data-theme=dark] .theme-toggle .moon-icon{display:block}.mobile-menu-toggle{display:none;flex-direction:column;justify-content:center;align-items:center;width:40px;height:40px;background:0 0;border:none;cursor:pointer;gap:5px}@media(max-width:768px){.mobile-menu-toggle{display:flex}}.mobile-menu-toggle .hamburger-line{width:24px;height:2px;background-color:var(--color-text);transition:all var(--transition-fast)}.mobile-menu-toggle.is-active .hamburger-line:nth-child(1){transform:rotate(45deg)translate(5px,5px)}.mobile-menu-toggle.is-active .hamburger-line:nth-child(2){opacity:0}.mobile-menu-toggle.is-active .hamburger-line:nth-child(3){transform:rotate(-45deg)translate(5px,-5px)}.home-timeline{position:relative}.timeline-container{position:relative;max-width:var(--container-max);margin:0 auto}.timeline-line{position:absolute;left:50%;top:-60px;bottom:-60px;width:var(--timeline-width);background:var(--color-timeline);transform:translateX(-50%);mask-image:linear-gradient(to bottom,transparent,black 100px,black calc(100% - 100px),transparent);-webkit-mask-image:linear-gradient(to bottom,transparent,black 100px,black calc(100% - 100px),transparent)}@media(max-width:768px){.timeline-line{left:20px}}.timeline-item{display:flex;align-items:stretch;margin-bottom:var(--spacing-2xl);position:relative}@media(max-width:768px){.timeline-item{flex-direction:column;padding-left:50px}}.timeline-dot{position:absolute;left:50%;top:30px;width:var(--timeline-dot);height:var(--timeline-dot);background:var(--color-timeline-dot);border-radius:50%;transform:translateX(-50%);z-index:1;border:3px solid var(--color-bg);box-shadow:0 0 0 3px var(--color-timeline)}@media(max-width:768px){.timeline-dot{left:20px;top:20px}}.timeline-card{width:calc(50% - var(--spacing-xl));flex-shrink:0}@media(max-width:768px){.timeline-card{width:100%;margin:0 0 var(--spacing-md)}.timeline-card:last-of-type{margin-bottom:0}}.timeline-card-left{margin-right:var(--spacing-xl)}@media(max-width:768px){.timeline-card-left{margin-right:0}}.timeline-card-right{margin-left:var(--spacing-xl)}@media(max-width:768px){.timeline-card-right{margin-left:0}}.timeline-card{background:var(--color-bg-card);border:1px solid var(--color-border-light);border-radius:var(--border-radius-lg);padding:var(--spacing-xl);box-shadow:0 4px 20px var(--color-shadow);transition:transform var(--transition-normal),box-shadow var(--transition-normal)}.timeline-card:hover{transform:translateY(-4px);box-shadow:0 8px 30px var(--color-shadow)}@media(max-width:768px){.timeline-card{padding:var(--spacing-lg)}}.timeline-card .card-header{margin-bottom:var(--spacing-md)}.timeline-card .card-title{font-size:1.5rem;margin-bottom:0}.timeline-card .card-title 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