:root{--orange:#FF8800;--orange-dark:#E67A00;--orange-light:#FFB84D;--orange-ghost:rgba(255,136,0,0.08);--orange-glow:rgba(255,136,0,0.15);--bg:#fafaf9;--bg-alt:#f4f4f1;--surface:#ffffff;--border:#e6e3de;--text:#1a1a1a;--text-secondary:#6b6b6b;--text-muted:#999;--code-bg:#1e1e24;--code-text:#e0e0e0;--radius:10px;--radius-lg:16px;--shadow:0 2px 16px rgba(0,0,0,0.05);--shadow-lg:0 8px 32px rgba(0,0,0,0.07);--font-mono:'Consolas','Fira Code','JetBrains Mono',monospace;--ease:cubic-bezier(0.16,1,0.3,1)}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei","Helvetica Neue",sans-serif;color:var(--text);background:var(--bg);line-height:1.7;-webkit-font-smoothing:antialiased}
img{max-width:100%;height:auto;content-visibility:auto}
a{color:var(--orange-dark);text-decoration:none;transition:color 0.2s var(--ease)}
a:hover{color:var(--orange)}
.site-header{position:sticky;top:0;z-index:100;background:rgba(250,250,249,0.88);backdrop-filter:blur(16px);border-bottom:1px solid var(--border);will-change:transform}
.header-inner{max-width:1280px;margin:0 auto;padding:0 24px;display:flex;align-items:center;justify-content:space-between;height:60px}
.logo{display:flex;align-items:center;gap:10px;font-weight:700;font-size:1.15rem;color:var(--text)}
.logo-icon{width:32px;height:32px;background:var(--orange);border-radius:8px;display:flex;align-items:center;justify-content:center;position:relative;overflow:hidden}
.logo-icon::after{content:'';position:absolute;width:13px;height:13px;background:#fff;clip-path:polygon(50% 0%,0% 100%,100% 100%);transform:rotate(-90deg)}
.nav-links{display:flex;align-items:center;gap:2px;list-style:none}
.nav-links a{display:block;padding:8px 14px;border-radius:8px;color:var(--text-secondary);font-size:.88rem;font-weight:500;transition:color 0.2s var(--ease),background 0.2s var(--ease)}
.nav-links a:hover,.nav-links a.active{color:var(--orange-dark);background:var(--orange-ghost)}
.nav-cta{background:var(--orange)!important;color:#fff!important;padding:8px 18px!important;font-weight:600!important}
.nav-cta:hover{background:var(--orange-dark)!important}
.mobile-menu-btn{display:none;background:none;border:none;cursor:pointer;padding:8px}
.mobile-menu-btn span{display:block;width:22px;height:2px;background:var(--text);margin:4px 0;transition:transform 0.2s var(--ease),opacity 0.2s var(--ease)}
.breadcrumb{max-width:1280px;margin:0 auto;padding:14px 24px 0;font-size:.82rem;color:var(--text-muted)}
.breadcrumb ol{list-style:none;display:flex;flex-wrap:wrap;gap:6px;padding:0}
.breadcrumb li{display:flex;align-items:center}
.breadcrumb li+li::before{content:'\203A';margin-right:6px;color:var(--text-muted)}
.breadcrumb a{color:var(--text-muted)}
.breadcrumb a:hover{color:var(--orange-dark)}
.breadcrumb [aria-current]{color:var(--text-secondary)}
.page-hero{max-width:1280px;margin:0 auto;padding:60px 24px 36px}
.page-hero h1{font-size:clamp(2rem,5vw,3.2rem);font-weight:800;letter-spacing:-0.03em;line-height:1.15;margin-bottom:12px}
.page-hero .sub{font-size:1.05rem;color:var(--text-secondary);max-width:600px;line-height:1.8}
.hero{max-width:1280px;margin:0 auto;padding:80px 24px 60px;display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:center;min-height:calc(100dvh - 60px)}
.hero-content{position:relative;z-index:2}
.hero-badge{display:inline-flex;align-items:center;gap:6px;padding:5px 14px;background:var(--orange-ghost);border:1px solid rgba(255,136,0,0.15);border-radius:100px;font-size:.82rem;font-weight:600;color:var(--orange-dark);margin-bottom:20px}
.hero-badge .dot{width:7px;height:7px;background:var(--orange);border-radius:50%;animation:pulse 2s infinite}

@keyframes pulse{0%,100%{opacity:1}
50%{opacity:.4}}
.hero h1{font-size:clamp(2.5rem,6vw,4rem);font-weight:800;letter-spacing:-0.04em;line-height:1.08;margin-bottom:18px}
.hero h1 .accent{color:var(--orange);position:relative}
.hero-desc{font-size:1.1rem;color:var(--text-secondary);line-height:1.8;margin-bottom:28px;max-width:500px}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap}
.hero-visual{display:flex;align-items:center;justify-content:center;position:relative}
.vlc-cone{position:relative;width:120px;height:180px;margin:0 auto}
.vlc-cone .cone-body{position:absolute;bottom:0;left:50%;transform:translateX(-50%);width:0;height:0;border-left:56px solid transparent;border-right:56px solid transparent;border-bottom:150px solid var(--orange);filter:drop-shadow(0 6px 20px var(--orange-glow))}
.vlc-cone .cone-stripe{position:absolute;bottom:38px;left:50%;transform:translateX(-50%);width:75px;height:4px;background:rgba(255,255,255,.5);border-radius:2px}
.vlc-cone .cone-stripe:nth-child(3){bottom:66px;width:56px}
.vlc-cone .cone-stripe:nth-child(4){bottom:94px;width:37px}
.btn{display:inline-flex;align-items:center;gap:8px;padding:13px 26px;border-radius:var(--radius);font-size:.95rem;font-weight:600;cursor:pointer;border:none;transition:background 0.2s var(--ease),color 0.2s var(--ease),transform 0.2s var(--ease),box-shadow 0.2s var(--ease),border-color 0.2s var(--ease);text-decoration:none;line-height:1}
.btn-primary{background:var(--orange);color:#fff;box-shadow:0 4px 14px var(--orange-glow)}
.btn-primary:hover{background:var(--orange-dark);color:#fff;transform:translateY(-1px);box-shadow:0 6px 20px var(--orange-glow)}
.btn-outline{background:transparent;color:var(--text);border:1.5px solid var(--border)}
.btn-outline:hover{border-color:var(--orange);color:var(--orange-dark);background:var(--orange-ghost)}
.btn-lg{padding:15px 30px;font-size:1rem;border-radius:12px}
.section{padding:80px 0;content-visibility:auto;contain-intrinsic-size:500px}
.section-alt{background:var(--surface)}
.section-inner{max-width:1280px;margin:0 auto;padding:0 24px}
.section-header{margin-bottom:44px}
.section-label{display:inline-block;font-size:.78rem;font-weight:700;text-transform:uppercase;letter-spacing:.06em;color:var(--orange);margin-bottom:10px}
.section-header h2{font-size:clamp(1.7rem,3.5vw,2.6rem);font-weight:800;letter-spacing:-0.03em;line-height:1.2;margin-bottom:10px}
.section-header .lead{color:var(--text-secondary);font-size:1rem;max-width:540px}
.stats-bar{border-top:1px solid var(--border);border-bottom:1px solid var(--border);background:var(--surface)}
.stats-inner{max-width:1280px;margin:0 auto;padding:26px 24px;display:grid;grid-template-columns:repeat(4,1fr);gap:20px;text-align:center}
.stat-num{font-size:2rem;font-weight:800;color:var(--orange);letter-spacing:-.02em;font-family:var(--font-mono)}
.stat-label{font-size:.82rem;color:var(--text-muted);margin-top:4px}
.bento-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.bento-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);padding:30px 26px;transition:transform 0.2s var(--ease),box-shadow 0.2s var(--ease),border-color 0.2s var(--ease);position:relative;overflow:hidden}
.bento-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-lg);border-color:transparent}
.bento-card.wide{grid-column:span 2}
.bento-icon{width:44px;height:44px;background:var(--orange-ghost);border-radius:10px;display:flex;align-items:center;justify-content:center;margin-bottom:16px;font-size:1.3rem;color:var(--orange)}
.bento-card h3{font-size:1.2rem;font-weight:700;margin-bottom:8px;letter-spacing:-.01em}
.bento-card p{color:var(--text-secondary);font-size:.9rem;line-height:1.7}
.feature-list{display:grid;gap:10px}
.feature-item{display:flex;align-items:flex-start;gap:16px;padding:18px 22px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);transition:border-color 0.2s var(--ease),box-shadow 0.2s var(--ease)}
.feature-item:hover{border-color:var(--orange-light);box-shadow:var(--shadow)}
.feature-item .check{flex-shrink:0;width:24px;height:24px;background:var(--orange-ghost);border-radius:6px;display:flex;align-items:center;justify-content:center;color:var(--orange);font-size:.75rem;font-weight:700;margin-top:1px}
.feature-item h4,.feature-item h3{font-size:1rem;font-weight:600;margin-bottom:3px}
.feature-item p{color:var(--text-secondary);font-size:.87rem}
.tutorial-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:36px}
.tutorial-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);padding:26px 22px;transition:transform 0.2s var(--ease),box-shadow 0.2s var(--ease),border-color 0.2s var(--ease);position:relative}
.tutorial-card .card-link{position:absolute;inset:0;z-index:1}
.tutorial-card h3 a,.tutorial-card .read-more{position:relative;z-index:2}
.tutorial-card:hover{transform:translateY(-2px);box-shadow:var(--shadow);border-color:var(--orange-light)}
.tutorial-card .cat-badge{display:inline-block;padding:3px 10px;background:var(--orange-ghost);color:var(--orange-dark);border-radius:100px;font-size:.75rem;font-weight:600;margin-bottom:14px}
.tutorial-card h3{font-size:1.1rem;font-weight:700;margin-bottom:8px;line-height:1.4}
.tutorial-card p{color:var(--text-secondary);font-size:.87rem;line-height:1.6;margin-bottom:14px}
.tutorial-card .read-more{font-weight:600;font-size:.87rem}
.tutorial-detail{max-width:780px;margin:0 auto;padding:40px 24px 80px}
.tutorial-detail article{padding:36px 0;border-bottom:1px solid var(--border)}
.tutorial-detail article:last-child{border-bottom:none}
.tutorial-detail h2{font-size:1.5rem;font-weight:700;margin-bottom:16px}
.tutorial-detail h3{font-weight:700;margin:26px 0 10px;font-size:1.05rem;color:var(--orange-dark)}
.tutorial-detail p{color:var(--text-secondary);margin-bottom:14px;line-height:1.85}
.tutorial-detail ol,.tutorial-detail ul{padding-left:22px;margin-bottom:18px;color:var(--text-secondary)}
.tutorial-detail li{margin-bottom:8px;line-height:1.7}
.tutorial-detail code{font-family:var(--font-mono);background:var(--bg-alt);color:var(--orange-dark);padding:2px 7px;border-radius:4px;font-size:.88em}
.tip-box{background:var(--orange-ghost);border:1px solid rgba(255,136,0,.12);border-radius:var(--radius);padding:16px 20px;margin:22px 0}
.tip-box strong{color:var(--orange-dark)}
.terminal-note{background:var(--code-bg);color:var(--code-text);padding:16px 20px;border-radius:var(--radius);font-family:var(--font-mono);font-size:.84rem;margin:22px 0;overflow-x:auto}
.terminal-note .p{color:var(--orange)}
.terminal-note .c{color:#6b6b6b}
.format-table-wrap{overflow-x:auto;margin-top:36px;border-radius:var(--radius-lg);border:1px solid var(--border)}
.format-table{width:100%;border-collapse:collapse;background:var(--surface);font-size:.87rem}
.format-table th{background:var(--bg-alt);padding:13px 18px;text-align:left;font-weight:700;font-size:.8rem;text-transform:uppercase;letter-spacing:.04em;border-bottom:1px solid var(--border)}
.format-table td{padding:11px 18px;border-bottom:1px solid var(--border);color:var(--text-secondary)}
.format-table tr:last-child td{border-bottom:none}
.format-table tr:hover td{background:var(--orange-ghost)}
.format-badge{display:inline-block;padding:2px 9px;border-radius:100px;font-size:.72rem;font-weight:600;background:var(--orange-ghost);color:var(--orange-dark)}
.shortcut-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-top:36px}
.shortcut-group{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);padding:22px 20px}
.shortcut-group h3{font-size:1rem;font-weight:700;margin-bottom:14px;padding-bottom:10px;border-bottom:1px solid var(--border)}
.shortcut-item{display:flex;justify-content:space-between;align-items:center;padding:8px 0;border-bottom:1px dashed var(--border)}
.shortcut-item:last-child{border-bottom:none}
.shortcut-item .key{font-family:var(--font-mono);background:var(--code-bg);color:var(--code-text);padding:3px 9px;border-radius:5px;font-size:.78rem;white-space:nowrap}
.shortcut-item .desc{color:var(--text-secondary);font-size:.84rem}
.faq-list{max-width:780px;margin:36px auto 0}
.faq-item{border:1px solid var(--border);border-radius:var(--radius);margin-bottom:10px;background:var(--surface);overflow:hidden}
.faq-q{padding:18px 22px;cursor:pointer;display:flex;justify-content:space-between;align-items:center;font-weight:600;font-size:1rem;user-select:none}
.faq-q .arrow{transition:transform 0.2s var(--ease);font-size:.75rem;color:var(--text-muted)}
.faq-item.open .faq-q .arrow{transform:rotate(180deg)}
.faq-a{padding:0 22px;max-height:0;overflow:hidden;transition:max-height 0.3s var(--ease),padding 0.3s var(--ease);color:var(--text-secondary);line-height:1.8}
.faq-item.open .faq-a{padding:0 22px 18px;max-height:500px}
.cta-section{background:var(--code-bg);color:#fff;padding:80px 24px;text-align:center;position:relative;overflow:hidden}
.cta-section::before{content:'';position:absolute;top:-50%;left:-50%;width:200%;height:200%;background:radial-gradient(circle at 30% 50%,var(--orange-glow),transparent 50%);opacity:.2;pointer-events:none}
.cta-section p{color:rgba(255,255,255,.6);font-size:1.05rem;margin-bottom:28px;position:relative;max-width:480px;margin-left:auto;margin-right:auto}
.site-footer{background:var(--surface);border-top:1px solid var(--border);padding:48px 24px 28px}
.footer-inner{max-width:1280px;margin:0 auto;display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:40px}
.footer-brand p{color:var(--text-muted);font-size:.85rem;margin-top:10px;line-height:1.7;max-width:270px}
.footer-col h4{font-size:.8rem;font-weight:700;text-transform:uppercase;letter-spacing:.05em;margin-bottom:14px}
.footer-col a{display:block;color:var(--text-secondary);font-size:.85rem;padding:3px 0}
.footer-col a:hover{color:var(--orange-dark)}
.footer-bottom{max-width:1280px;margin:28px auto 0;padding:22px 24px 0;border-top:1px solid var(--border);display:flex;justify-content:space-between;font-size:.78rem;color:var(--text-muted)}
.back-to-top{position:fixed;bottom:28px;right:28px;width:40px;height:40px;background:var(--surface);border:1px solid var(--border);border-radius:10px;display:flex;align-items:center;justify-content:center;cursor:pointer;opacity:0;visibility:hidden;transition:opacity 0.2s var(--ease),visibility 0.2s var(--ease),background 0.2s var(--ease),color 0.2s var(--ease),border-color 0.2s var(--ease);box-shadow:var(--shadow);z-index:50}
.back-to-top.visible{opacity:1;visibility:visible}
.back-to-top:hover{background:var(--orange);color:#fff;border-color:var(--orange)}
.fade-in{opacity:0;transform:translateY(24px);transition:opacity .5s ease,transform .5s var(--ease);will-change:transform,opacity}
.fade-in.visible{opacity:1;transform:translateY(0)}

@media(max-width:1024px){.hero{grid-template-columns:1fr;gap:36px;min-height:auto;padding:56px 24px}
.hero-visual{display:none}
.bento-grid{grid-template-columns:1fr 1fr}
.bento-card.wide{grid-column:span 2}
.tutorial-grid{grid-template-columns:1fr 1fr}
.stats-inner{grid-template-columns:repeat(2,1fr)}
.footer-inner{grid-template-columns:1fr 1fr}
.shortcut-grid{grid-template-columns:1fr 1fr}}

@media(max-width:768px){.nav-links{display:none}
.nav-links.open{display:flex;flex-direction:column;position:absolute;top:60px;left:0;right:0;background:var(--surface);border-bottom:1px solid var(--border);padding:12px;box-shadow:var(--shadow-lg)}
.mobile-menu-btn{display:flex;flex-direction:column;align-items:center;justify-content:center;min-width:44px;min-height:44px}
.nav-links a{padding:14px 18px}
.nav-cta{padding:14px 18px!important}
.bento-grid{grid-template-columns:1fr}
.bento-card.wide{grid-column:span 1}
.tutorial-grid{grid-template-columns:1fr}
.stats-inner{grid-template-columns:repeat(2,1fr)}
.footer-inner{grid-template-columns:1fr;gap:30px}
.footer-bottom{flex-direction:column;gap:8px;text-align:center}
.shortcut-grid{grid-template-columns:1fr}}

@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation-duration:0.01ms!important;transition-duration:0.01ms!important;scroll-behavior:auto}}

@media print{.site-header,.back-to-top,.cta-section{display:none}
body{background:#fff;color:#000}}
.related-tutorials{margin:34px 0 6px;padding:24px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:var(--shadow)}
.related-tutorials h2{font-size:1.25rem;margin-bottom:16px;color:var(--text);display:flex;align-items:center;gap:9px}
.related-tutorials h2::before{content:"";width:4px;height:18px;background:var(--orange);border-radius:2px;display:inline-block}
.related-list{list-style:none;display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:12px}
.related-list li a{display:block;padding:13px 15px;background:var(--bg-alt);border:1px solid var(--border);border-radius:var(--radius);color:var(--text);text-decoration:none;font-size:.95rem;transition:border-color .2s var(--ease),transform .2s var(--ease),box-shadow .2s var(--ease)}
.related-list li a:hover{border-color:var(--orange);transform:translateY(-2px);box-shadow:var(--shadow-lg);color:var(--orange)}
.error-404{max-width:560px;margin:60px auto;text-align:center;padding:40px 24px}
.error-code{font-size:5.5rem;font-weight:800;line-height:1;color:var(--orange);letter-spacing:-2px;margin-bottom:8px;text-shadow:0 4px 18px rgba(255,136,0,.18)}
.error-404 h1{font-size:1.9rem;margin-bottom:16px;color:var(--text)}
.error-404 .lead{font-size:1.05rem;color:var(--text-soft);margin-bottom:8px}
.error-404 .hint{color:var(--text-soft);margin-bottom:24px;font-size:.95rem}
.error-actions{display:flex;flex-wrap:wrap;gap:12px;justify-content:center;margin-bottom:24px}
.btn-secondary{display:inline-flex;align-items:center;justify-content:center;padding:11px 22px;border-radius:var(--radius);border:1px solid var(--border);background:var(--surface);color:var(--text);text-decoration:none;font-size:.95rem;font-weight:600;transition:border-color .2s var(--ease),transform .2s var(--ease),box-shadow .2s var(--ease)}
.btn-secondary:hover{border-color:var(--orange);transform:translateY(-2px);box-shadow:var(--shadow-lg);color:var(--orange)}
.error-404 .back-tip{font-size:.85rem;color:var(--text-faint);line-height:1.6}