@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&display=swap');
:root{--primary:hsl(215,100%,52%);--primary-light:hsl(215,100%,60%);--primary-dark:hsl(215,100%,45%);--primary-glow:hsla(215,100%,52%,0.15);--accent:hsl(198,93%,60%);--success:hsl(142,76%,36%);--warning:hsl(38,92%,50%);--text:hsl(222,47%,11%);--text-light:hsl(215,16%,47%);--muted:hsl(217,19%,53%);--bg:hsl(0,0%,100%);--surface:hsl(218,32%,97%);--surface-elevated:hsl(0,0%,100%);--radius-sm:8px;--radius-md:12px;--radius-lg:16px;--radius-xl:24px;--shadow-sm:0 2px 8px hsla(222,47%,11%,0.04);--shadow-md:0 4px 16px hsla(222,47%,11%,0.06);--shadow-lg:0 8px 32px hsla(222,47%,11%,0.08);--shadow-xl:0 12px 48px hsla(222,47%,11%,0.12);--shadow-primary:0 8px 24px hsla(215,100%,52%,0.2);--shadow-glow:0 0 40px hsla(215,100%,52%,0.15);--gradient-primary:linear-gradient(135deg,hsl(215,100%,52%),hsl(215,100%,60%));--gradient-subtle:linear-gradient(180deg,hsl(218,32%,97%),hsl(0,0%,100%));--gradient-hero:linear-gradient(180deg,hsla(215,100%,52%,0.08),hsla(215,100%,52%,0.02));--transition-fast:all 0.15s cubic-bezier(0.4,0,0.2,1);--transition-base:all 0.24s cubic-bezier(0.4,0,0.2,1);--transition-slow:all 0.36s cubic-bezier(0.4,0,0.2,1);--ease:cubic-bezier(0.4,0,0.2,1)}
*{box-sizing:border-box;margin:0;padding:0}
body{font-family:'Inter',system-ui,-apple-system,'Segoe UI',Roboto,'Helvetica Neue','PingFang SC','Hiragino Sans GB','Microsoft YaHei',sans-serif;letter-spacing:0.01em;background:var(--bg);color:var(--text);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;line-height:1.6}
.container{width:92%;max-width:1280px;margin:0 auto;padding:0 20px}
header.site-header{position:fixed;top:0;left:0;width:100%;background:hsla(0,0%,100%,0.98);backdrop-filter:blur(12px);z-index:1200;box-shadow:var(--shadow-md);border-bottom:1px solid hsla(222,47%,11%,0.06)}
.logo-wrapper{display:flex;align-items:center;gap:10px;text-decoration:none;color:inherit}
.logo-img{width:36px;height:36px;display:block;object-fit:contain;flex-shrink:0}
.logo-text{font-size:1.5rem;font-weight:800;color:var(--text);letter-spacing:0.5px;background:var(--gradient-primary);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;line-height:1}
.nav-links{display:flex;gap:8px;align-items:center}
.nav-links a{color:var(--text-light);text-decoration:none;padding:10px 16px;border-radius:var(--radius-md);transition:var(--transition-fast);font-weight:600;font-size:0.95rem}
.nav-links a:hover,.nav-links a.active{color:var(--primary);background:hsla(215,100%,52%,0.1)}
.btn-login{display:inline-flex;align-items:center;justify-content:center;text-decoration:none;border:2px solid hsla(215,100%,52%,0.2);color:var(--primary);padding:10px 24px;border-radius:var(--radius-lg);background:transparent;font-weight:700;cursor:pointer;transition:var(--transition-base);font-size:0.95rem}
.btn-login:hover{background:var(--primary);color:#fff;border-color:var(--primary);transform:translateY(-2px);box-shadow:var(--shadow-primary)}
nav{width:100%;max-width:1280px;display:flex;align-items:center;justify-content:space-between;padding:12px 0}
main{padding-top:0;margin-top:0}
.hero{min-height:78vh;display:flex;align-items:center;justify-content:center;text-align:center;padding:140px 0 80px;background:var(--gradient-hero),url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='1200' height='600' viewBox='0 0 1200 600'%3E%3Cdefs%3E%3ClinearGradient id='g' x1='0' x2='1'%3E%3Cstop offset='0' stop-color='%230b66ff' stop-opacity='0.06'/%3E%3Cstop offset='1' stop-color='%230b66ff' stop-opacity='0.02'/%3E%3C/linearGradient%3E%3C/defs%3E%3Crect width='1200' height='600' fill='%23ffffff'/%3E%3Cg fill='none' stroke='%230b66ff' stroke-opacity='0.05' stroke-width='1'%3E%3Cpath d='M0 400 C150 300 300 300 450 350 C600 400 750 480 900 460 C1050 440 1200 360 1200 360'/%3E%3C/g%3E%3C/svg%3E") center/cover no-repeat;position:relative;overflow:hidden}
.hero::before{content:'';position:absolute;top:0;left:0;right:0;bottom:0;background:radial-gradient(circle at 50% 30%,hsla(215,100%,52%,0.08),transparent 60%);pointer-events:none}
.hero .hero-content{padding:20px;position:relative;z-index:1}
.hero h1{font-family:'Inter',sans-serif;font-size:clamp(2.5rem,5vw,4rem);line-height:1.1;color:var(--text);margin-bottom:16px;font-weight:900;letter-spacing:-0.02em}
.hero h1 span{background:var(--gradient-primary);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.hero p{color:var(--text-light);font-size:clamp(1.05rem,2vw,1.25rem);margin-bottom:32px;max-width:640px;margin-left:auto;margin-right:auto;line-height:1.7}
.cta-buttons{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}
.btn{padding:14px 32px;border-radius:var(--radius-lg);text-decoration:none;font-weight:700;font-size:1rem;transition:var(--transition-base);display:inline-flex;align-items:center;justify-content:center;gap:8px}
.btn-primary{background:var(--gradient-primary);color:#fff;border:none;box-shadow:var(--shadow-primary)}
.btn-primary:hover{transform:translateY(-3px);box-shadow:0 16px 40px hsla(215,100%,52%,0.3)}
.btn-secondary{background:hsla(215,100%,52%,0.08);border:2px solid hsla(215,100%,52%,0.2);color:var(--primary)}
.btn-secondary:hover{background:hsla(215,100%,52%,0.15);border-color:var(--primary);transform:translateY(-2px)}
.features,.pricing{padding:100px 0;scroll-margin-top:88px}
.features{background:var(--bg)}
.pricing{background:var(--gradient-subtle)}
.section-title{font-size:clamp(1.8rem,3vw,2.5rem);text-align:center;margin-bottom:20px;color:var(--text);font-weight:800;letter-spacing:-0.01em}
.section-subtitle{text-align:center;color:var(--text-light);font-size:1.1rem;margin-bottom:60px;max-width:600px;margin-left:auto;margin-right:auto;line-height:1.7}
.features-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:24px}
.feature-card{background:var(--surface-elevated);padding:32px 28px;border-radius:var(--radius-xl);box-shadow:var(--shadow-md);text-align:center;transition:var(--transition-base);border:1px solid hsla(222,47%,11%,0.04);position:relative;overflow:hidden}
.feature-card::before{content:'';position:absolute;top:0;left:0;right:0;height:4px;background:var(--gradient-primary);opacity:0;transition:var(--transition-base)}
.feature-card:hover{transform:translateY(-8px);box-shadow:var(--shadow-xl);border-color:hsla(215,100%,52%,0.2)}
.feature-card:hover::before{opacity:1}
.feature-icon{font-size:42px;margin-bottom:20px;display:inline-block;background:hsla(215,100%,52%,0.1);padding:16px;border-radius:var(--radius-lg);line-height:1}
.feature-card h3{font-size:1.25rem;margin-bottom:12px;color:var(--text);font-weight:700}
.feature-card p{color:var(--text-light);font-size:1rem;line-height:1.7}
.plans{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:32px;align-items:start}
.plan-card{background:var(--surface-elevated);padding:36px 32px;border-radius:var(--radius-xl);border:2px solid hsla(222,47%,11%,0.06);box-shadow:var(--shadow-lg);text-align:left;transition:var(--transition-base);position:relative;overflow:hidden}
.plan-card::before{content:'';position:absolute;top:0;left:0;right:0;height:6px;background:var(--gradient-primary);opacity:0;transition:var(--transition-base)}
.plan-card:hover{transform:translateY(-8px);box-shadow:var(--shadow-xl);border-color:hsla(215,100%,52%,0.3)}
.plan-card:hover::before{opacity:1}
.plan-card.popular{border-color:var(--primary);transform:scale(1.02);box-shadow:var(--shadow-primary)}
.plan-card.popular::before{opacity:1}
.popular-tag{position:absolute;top:16px;right:16px;background:var(--gradient-primary);color:#fff;padding:6px 14px;border-radius:20px;font-size:0.8rem;font-weight:700;text-transform:uppercase;letter-spacing:0.5px;box-shadow:var(--shadow-sm)}
.plan-card h3{font-size:1.5rem;margin-bottom:8px;color:var(--text);font-weight:800}
.plan-price{font-size:2.5rem;color:var(--primary);font-weight:800;margin:20px 0;display:flex;align-items:baseline;gap:4px}
.plan-price span{font-size:1rem;color:var(--text-light);font-weight:500}
.plan-features{list-style:none;padding:0;margin:28px 0}
.plan-features li{padding:12px 0;border-bottom:1px solid hsla(222,47%,11%,0.04);color:var(--text-light);display:flex;align-items:center;gap:10px;font-size:1rem}
.plan-features li:last-child{border-bottom:none}
.plan-features li::before{content:'✓';color:var(--success);font-weight:800;font-size:1.1rem}
.btn-plan{width:100%;padding:16px;border-radius:var(--radius-md);border:none;background:var(--gradient-primary);color:#fff;font-weight:700;cursor:pointer;transition:var(--transition-base);font-size:1rem;text-decoration:none;display:inline-block;text-align:center}
.btn-plan:hover{transform:translateY(-2px);box-shadow:var(--shadow-primary)}
.btn-plan.primary{background:var(--gradient-primary);box-shadow:var(--shadow-primary)}
.btn-plan-outline{width:100%;padding:16px;border-radius:var(--radius-md);border:2px solid hsla(215,100%,52%,0.3);background:transparent;color:var(--primary);font-weight:700;cursor:pointer;transition:var(--transition-base);font-size:1rem;text-decoration:none;display:inline-block;text-align:center;margin-top:8px}
.btn-plan-outline:hover{border-color:var(--primary);background:hsla(215,100%,52%,0.08);transform:translateY(-2px)}
.plan-actions{display:flex;flex-direction:column;gap:8px;margin-top:8px}
footer{background:linear-gradient(180deg,hsl(222,47%,11%),hsl(223,44%,14%));padding:64px 0 40px;color:hsla(0,0%,100%,0.9)}
.footer-content{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:48px;margin-bottom:40px}
.footer-column h4{font-size:1.1rem;margin-bottom:20px;color:#fff;font-weight:700;letter-spacing:0.3px}
.footer-column ul{list-style:none;padding:0;margin:0}
.footer-column ul li{margin-bottom:12px}
.footer-column ul li a{color:hsla(0,0%,100%,0.7);text-decoration:none;font-size:0.95rem;transition:var(--transition-fast)}
.footer-column ul li a:hover{color:#fff;text-decoration:underline}
.copyright{border-top:1px solid hsla(0,0%,100%,0.1);padding-top:24px;text-align:center;color:hsla(0,0%,100%,0.5);font-size:0.9rem;line-height:1.8}
.copyright p{margin-bottom:8px}
.legal-info{font-size:0.85rem}
.legal-info a{color:hsla(0,0%,100%,0.5);text-decoration:none}
.legal-info a:hover{text-decoration:underline;color:hsla(0,0%,100%,0.7)}
.footer-badges{display:flex;gap:12px;flex-wrap:wrap;margin-top:16px;justify-content:center}
.footer-note{font-size:0.9rem;color:hsla(0,0%,100%,0.6);text-align:center;margin-top:16px}
@media(max-width:1024px){.container{width:95%;padding:0 16px}.features-grid{grid-template-columns:repeat(auto-fit,minmax(260px,1fr))}.plans{grid-template-columns:1fr;max-width:480px;margin:0 auto}}
@media(max-width:900px){.nav-links{display:none}.nav-toggle{display:inline-flex}.hero h1{font-size:2.5rem}.footer-content{gap:32px}}
@media(max-width:768px){.hero{min-height:66vh;padding:100px 0 60px}.hero h1{font-size:2rem}.hero p{font-size:1rem}.cta-buttons{flex-direction:column;width:100%}.btn{width:100%}.features,.pricing{padding:64px 0}.feature-card{padding:24px 20px}.plan-card{padding:28px 24px}.footer-content{grid-template-columns:1fr;gap:24px;text-align:center}.footer-column ul li a{font-size:0.9rem}}
@media(max-width:480px){.hero h1{font-size:1.75rem}.section-title{font-size:1.5rem}.plan-price{font-size:2rem}.feature-icon{font-size:36px;padding:12px}}
.nav-toggle{background:transparent;border:0;padding:10px;cursor:pointer;border-radius:var(--radius-md);transition:var(--transition-fast)}
.nav-toggle:focus{outline:2px solid var(--primary-glow)}
.nav-toggle .bar{display:block;width:20px;height:2.5px;background:var(--text);margin:4px 0;border-radius:2px;transition:var(--transition-base)}
.nav-toggle[aria-expanded="true"] .bar:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .bar:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .bar:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
.nav-links.open{display:flex;flex-direction:column;position:absolute;top:100%;right:16px;background:#fff;padding:16px;border-radius:var(--radius-lg);box-shadow:var(--shadow-xl);border:1px solid hsla(222,47%,11%,0.06);min-width:200px;animation:slideIn 0.2s var(--ease)}
.nav-links.open a{color:var(--text);padding:12px 16px;width:100%}
@keyframes slideIn{from{opacity:0;transform:translateY(-8px)}to{opacity:1;transform:translateY(0)}}