/* ========================================
   👻 Phantom K3 · 设计系统
   jskskj.com — 名爵K3极速巅峰品牌站
   ======================================== */

:root {
  /* -- Colors -- */
  --bg-primary: #05080f;
  --bg-secondary: #0a0f1a;
  --bg-tertiary: #0f1525;
  --bg-card: rgba(255,255,255,0.02);
  --bg-glass: rgba(6,182,212,0.04);
  --bg-glass-hover: rgba(6,182,212,0.08);
  
  --cyan: #06b6d4;
  --cyan-light: #67e8f9;
  --cyan-dark: #0891b2;
  --cyan-glow: rgba(6,182,212,0.25);
  
  --rose: #e11d48;
  --rose-light: #fb7185;
  --rose-glow: rgba(225,29,72,0.25);
  
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  
  --border-cyan: rgba(6,182,212,0.12);
  --border-cyan-hover: rgba(6,182,212,0.3);
  --border-default: rgba(255,255,255,0.04);
  
  /* -- Gradients -- */
  --grad-cyan: linear-gradient(135deg, #06b6d4, #67e8f9);
  --grad-rose: linear-gradient(135deg, #e11d48, #fb7185);
  --grad-hero: linear-gradient(135deg, rgba(5,8,15,0.92), rgba(10,15,26,0.88));
  --grad-accent: linear-gradient(135deg, rgba(6,182,212,0.06), transparent);
  --grad-cta: linear-gradient(135deg, #06b6d4, #0891b2);
  
  /* -- Shadows -- */
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 20px rgba(0,0,0,0.4);
  --shadow-lg: 0 8px 40px rgba(0,0,0,0.5);
  --shadow-cyan: 0 4px 24px rgba(6,182,212,0.12);
  
  /* -- Typography -- */
  --font: 'PingFang SC','Microsoft YaHei','Noto Sans SC',system-ui,-apple-system,sans-serif;
  --font-mono: 'JetBrains Mono','Fira Code',monospace;
  
  /* -- Layout -- */
  --section-padding: 80px 0;
  --container: 1200px;
  --gap: 24px;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
}

/* -- Reset -- */
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-font-smoothing:antialiased}
body{font-family:var(--font);background:var(--bg-primary);color:var(--text-primary);line-height:1.7;overflow-x:hidden}
img{max-width:100%;height:auto;display:block}
a{color:var(--cyan);text-decoration:none;transition:color .25s}
a:hover{color:var(--cyan-light)}
ul{list-style:none}

.container{width:100%;max-width:var(--container);margin:0 auto;padding:0 20px}
.section{padding:var(--section-padding);position:relative}
.section-dark{background:var(--bg-primary)}
.section-secondary{background:var(--bg-secondary)}
.section-tertiary{background:var(--bg-tertiary)}

/* -- Typography -- */
.cyan-text{color:var(--cyan)}
.rose-text{color:var(--rose)}
.text-center{text-align:center}
.gradient-text{background:var(--grad-cyan);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.gradient-rose-text{background:var(--grad-rose);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}

.section-label{
  display:inline-flex;align-items:center;gap:8px;
  font-size:.78rem;font-weight:700;text-transform:uppercase;
  letter-spacing:3px;color:var(--cyan);margin-bottom:14px;
  padding:4px 14px;border:1px solid var(--border-cyan);
  border-radius:4px;background:var(--bg-glass);
}
.section-title{font-size:clamp(1.6rem,3.8vw,2.6rem);font-weight:800;line-height:1.15;margin-bottom:14px;letter-spacing:1px}
.section-subtitle{font-size:1rem;color:var(--text-secondary);max-width:580px;line-height:1.8}

/* -- Buttons -- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:13px 34px;border-radius:6px;font-size:.95rem;font-weight:700;
  letter-spacing:1px;cursor:pointer;transition:all .3s;border:none;
  font-family:var(--font);text-decoration:none;
}
.btn-cyan{background:var(--grad-cyan);color:#05080f!important;box-shadow:0 4px 20px var(--cyan-glow)}
.btn-cyan:hover{transform:translateY(-2px);box-shadow:0 8px 30px var(--cyan-glow);color:#05080f!important}
.btn-rose{background:var(--grad-rose);color:#fff!important;box-shadow:0 4px 20px var(--rose-glow)}
.btn-rose:hover{transform:translateY(-2px);box-shadow:0 8px 30px var(--rose-glow);color:#fff!important}
.btn-outline{background:transparent;color:var(--cyan)!important;border:2px solid var(--cyan)}
.btn-outline:hover{background:var(--cyan);color:#05080f!important;transform:translateY(-2px)}
.btn-ghost{background:transparent;color:var(--text-secondary)!important;border:1px solid var(--border-default)}
.btn-ghost:hover{border-color:var(--border-cyan-hover);color:var(--cyan)!important}

/* -- Header -- */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:1000;
  background:rgba(5,8,15,.85);backdrop-filter:blur(20px);
  border-bottom:1px solid var(--border-default);transition:all .3s
}
.site-header.scrolled{background:rgba(5,8,15,.96);box-shadow:0 4px 30px rgba(0,0,0,.5)}
.nav-container{max-width:var(--container);margin:0 auto;padding:0 20px;display:flex;align-items:center;justify-content:space-between;height:70px}
.nav-brand{display:flex;align-items:center;gap:10px;font-size:1.2rem;font-weight:800;color:var(--text-primary)!important}
.nav-brand .brand-icon{width:34px;height:34px;background:var(--grad-cyan);border-radius:6px;display:flex;align-items:center;justify-content:center;font-size:1rem;color:#05080f;font-weight:900}
.nav-links{display:flex;align-items:center;gap:4px}
.nav-links a{padding:7px 14px;border-radius:6px;font-size:.88rem;font-weight:500;color:var(--text-secondary)!important;transition:all .25s}
.nav-links a:hover,.nav-links a.active{color:var(--cyan)!important;background:var(--bg-glass)}
.nav-cta{display:flex;align-items:center;gap:8px}
.nav-cta .btn{padding:7px 20px;font-size:.82rem}
.nav-toggle{display:none;flex-direction:column;gap:5px;cursor:pointer;padding:4px;background:none;border:none}
.nav-toggle span{display:block;width:26px;height:2px;background:var(--text-primary);border-radius:2px;transition:all .25s}

/* -- Hero -- */
.hero{
  min-height:100vh;display:flex;align-items:center;position:relative;
  overflow:hidden;padding-top:calc(70px + .75rem)
}
.hero-bg{position:absolute;inset:0;z-index:0}
.hero-bg svg{width:100%;height:100%}
.hero-overlay{position:absolute;inset:0;background:var(--grad-hero);z-index:1}
.hero-accent{position:absolute;top:0;right:0;width:35%;height:100%;background:var(--grad-accent);z-index:1;clip-path:polygon(40% 0,100% 0,100% 100%,0% 100%)}
.hero-content{position:relative;z-index:2;max-width:720px}
.hero-badge{display:inline-flex;align-items:center;gap:8px;padding:5px 16px;border-radius:4px;background:var(--bg-glass);border:1px solid var(--border-cyan);font-size:.78rem;color:var(--cyan);letter-spacing:2px;margin-bottom:20px}
.hero h1{font-size:clamp(2rem,5vw,3.6rem);font-weight:900;line-height:1.1;margin-bottom:16px;letter-spacing:1px}
.hero p{font-size:1.05rem;color:var(--text-secondary);line-height:1.8;max-width:540px;margin-bottom:32px}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap}
.hero-stats{display:flex;gap:36px;margin-top:44px;padding-top:26px;border-top:1px solid var(--border-default)}
.hero-stat-item{text-align:center}
.hero-stat-item .num{font-size:1.7rem;font-weight:800;font-family:var(--font-mono);background:var(--grad-cyan);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.hero-stat-item .label{font-size:.78rem;color:var(--text-muted);margin-top:2px;letter-spacing:1px}

/* -- Hero Compact -- */
.hero-compact{min-height:45vh;padding-top:calc(70px + .75rem);display:flex;align-items:center;position:relative;overflow:hidden}
.hero-compact .hero-content{padding:50px 0 30px}
.hero-compact h1{font-size:clamp(1.6rem,3vw,2.4rem)}

/* -- Hero Split (两列Hero) -- */
.hero-split{min-height:55vh;padding-top:calc(70px + .75rem);display:flex;align-items:center;position:relative;overflow:hidden}
.hero-split .container{position:relative;z-index:2;width:100%}
.hero-split .hero-grid{display:grid;grid-template-columns:1.2fr 1fr;gap:40px;align-items:center;min-height:45vh}
.hero-split .hero-left{position:relative;z-index:2}
.hero-split .hero-left .hero-content{max-width:580px;padding:50px 0}
.hero-split .hero-left .hero-content p{font-size:1.05rem;color:var(--text-secondary);line-height:1.8;margin-bottom:32px}
.hero-split .hero-right{position:relative;z-index:2;display:flex;justify-content:center;align-items:center}
.hero-split .hero-right svg,.hero-split .hero-right img{width:100%;max-width:460px;height:auto}.hero-split .hero-right img{border-radius:12px;border:1px solid rgba(6,182,212,0.12);box-shadow:0 0 40px rgba(6,182,212,0.08);transition:all .4s;background:var(--bg-card)}.hero-split .hero-right img:hover{transform:scale(1.02);border-color:rgba(6,182,212,0.25);box-shadow:0 0 60px rgba(6,182,212,0.12)}
.hero-split h1{font-size:clamp(1.8rem,3.2vw,2.6rem)}
.hero-split .hero-actions{margin-top:8px}
@media(max-width:768px){
  .hero-split .hero-grid{grid-template-columns:1fr;gap:10px}
  .hero-split .hero-right{order:-1}
  .hero-split .hero-right svg{max-width:240px}
  .hero-split{min-height:auto;padding-top:calc(70px + .25rem)}
  .hero-split .hero-left .hero-content{padding:20px 0}
}

/* -- Cards -- */
.card{
  background:var(--bg-card);border:1px solid var(--border-default);
  border-radius:var(--radius-md);padding:28px;
  transition:all .3s;position:relative;overflow:hidden
}
.card::before{content:'';position:absolute;top:0;left:0;right:0;height:2px;background:var(--grad-cyan);opacity:0;transition:opacity .3s}
.card:hover{transform:translateY(-3px);border-color:var(--border-cyan);box-shadow:var(--shadow-cyan);background:var(--bg-glass-hover)}
.card:hover::before{opacity:1}
.card-icon{width:48px;height:48px;border-radius:var(--radius-sm);background:var(--bg-glass);border:1px solid var(--border-cyan);display:flex;align-items:center;justify-content:center;font-size:1.3rem;margin-bottom:16px}
.card h3{font-size:1.1rem;font-weight:700;margin-bottom:8px}
.card p{font-size:.88rem;color:var(--text-secondary);line-height:1.7}
.card .card-tag{display:inline-block;padding:2px 10px;border-radius:3px;font-size:.7rem;font-weight:600;background:var(--cyan-glow);color:var(--cyan);margin-bottom:10px;letter-spacing:1px}

/* -- Grids -- */
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:var(--gap)}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:var(--gap)}
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:var(--gap)}

/* -- Stats -- */
.stats-section{background:var(--bg-tertiary);position:relative;overflow:hidden}
.stats-section::before{content:'';position:absolute;top:-40%;right:-10%;width:400px;height:400px;background:radial-gradient(circle,rgba(6,182,212,.05),transparent 70%);pointer-events:none}
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:28px}
.stat-item{text-align:center;padding:28px}
.stat-number{font-size:2.6rem;font-weight:900;font-family:var(--font-mono);background:var(--grad-cyan);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;line-height:1;margin-bottom:6px}
.stat-label{font-size:.88rem;color:var(--text-secondary);letter-spacing:1px}

/* -- FAQ -- */
.faq-list{max-width:780px;margin:0 auto}
.faq-item{border:1px solid var(--border-default);border-radius:var(--radius-sm);margin-bottom:10px;overflow:hidden;transition:border-color .25s}
.faq-item:hover{border-color:var(--border-cyan)}
.faq-question{padding:16px 22px;display:flex;justify-content:space-between;align-items:center;cursor:pointer;font-weight:600;font-size:.92rem;background:var(--bg-card);transition:background .25s;user-select:none}
.faq-question:hover{background:var(--bg-glass)}
.faq-question .faq-icon{width:22px;height:22px;display:flex;align-items:center;justify-content:center;color:var(--cyan);transition:transform .25s;flex-shrink:0}
.faq-item.active .faq-icon{transform:rotate(45deg)}
.faq-answer{max-height:0;overflow:hidden;transition:max-height .3s}
.faq-answer-inner{padding:0 22px 16px;font-size:.88rem;color:var(--text-secondary);line-height:1.8}
.faq-item.active .faq-answer{max-height:300px}

/* -- CTA -- */
.cta-section{background:var(--bg-tertiary);text-align:center;position:relative;overflow:hidden}
.cta-section::before{content:'';position:absolute;bottom:-25%;left:50%;transform:translateX(-50%);width:500px;height:500px;background:radial-gradient(circle,rgba(6,182,212,.04),transparent 70%);pointer-events:none}
.cta-section h2{font-size:clamp(1.5rem,2.8vw,2.2rem);font-weight:800;margin-bottom:12px}
.cta-section p{color:var(--text-secondary);max-width:480px;margin:0 auto 26px}
.cta-actions{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}

/* -- Contact -- */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:36px;align-items:center}
.contact-info-card{background:var(--bg-card);border:1px solid var(--border-default);border-radius:var(--radius-md);padding:36px}
.contact-info-card h3{font-size:1.2rem;margin-bottom:18px}
.contact-item{display:flex;align-items:center;gap:12px;padding:12px 0;border-bottom:1px solid var(--border-default)}
.contact-item:last-child{border-bottom:none}
.contact-item-icon{width:40px;height:40px;border-radius:var(--radius-sm);background:var(--bg-glass);border:1px solid var(--border-cyan);display:flex;align-items:center;justify-content:center;flex-shrink:0}
.contact-item-label{font-size:.78rem;color:var(--text-muted)}
.contact-item-value{font-size:.92rem;font-weight:600;color:var(--cyan)}

/* -- Feature Split -- */
.feature-split{display:grid;grid-template-columns:1fr 1fr;gap:50px;align-items:center}
.feature-split.reverse{direction:rtl}
.feature-split.reverse>*{direction:ltr}
.feature-visual{border-radius:var(--radius-md);overflow:hidden;background:var(--bg-tertiary);min-height:280px;display:flex;align-items:center;justify-content:center;border:1px solid var(--border-default)}

/* -- Timeline -- */
.timeline{position:relative;max-width:760px;margin:0 auto;padding-left:36px}
.timeline::before{content:'';position:absolute;left:12px;top:0;bottom:0;width:2px;background:var(--border-cyan)}
.timeline-item{position:relative;padding:18px 0 18px 36px}
.timeline-item::before{content:'';position:absolute;left:-24px;top:24px;width:10px;height:10px;border-radius:50%;background:var(--grad-cyan);border:2px solid var(--bg-primary)}
.timeline-item .time{font-size:.78rem;color:var(--cyan);font-weight:600;margin-bottom:4px}
.timeline-item h4{font-size:1rem;margin-bottom:4px}
.timeline-item p{font-size:.88rem;color:var(--text-secondary)}

/* -- Testimonial -- */
.testimonial-card{background:var(--bg-card);border:1px solid var(--border-default);border-radius:var(--radius-md);padding:28px;position:relative}
.testimonial-card::before{content:'"';position:absolute;top:12px;right:20px;font-size:3.5rem;line-height:1;color:var(--cyan);opacity:.1;font-family:serif}
.testimonial-card .stars{color:var(--cyan);font-size:.85rem;margin-bottom:10px}
.testimonial-card blockquote{font-size:.88rem;color:var(--text-secondary);line-height:1.8;margin-bottom:14px;font-style:italic}
.testimonial-card .author{display:flex;align-items:center;gap:10px}
.testimonial-card .author-avatar{width:36px;height:36px;border-radius:50%;background:var(--grad-cyan);display:flex;align-items:center;justify-content:center;font-weight:700;font-size:.85rem;color:#05080f}
.testimonial-card .author-name{font-weight:600;font-size:.88rem}
.testimonial-card .author-title{font-size:.75rem;color:var(--text-muted)}

/* -- Step Number -- */
.step-num{width:40px;height:40px;border-radius:6px;background:var(--grad-cyan);display:flex;align-items:center;justify-content:center;font-weight:800;font-size:1rem;color:#05080f;flex-shrink:0}

/* -- Pills -- */
.pill{display:inline-block;padding:3px 12px;border-radius:3px;font-size:.72rem;font-weight:600;background:var(--bg-glass);color:var(--text-secondary);border:1px solid var(--border-default)}
.pill-cyan{background:var(--cyan-glow);color:var(--cyan);border-color:var(--border-cyan)}

/* -- Brand Strip -- */
.brand-strip{display:flex;justify-content:center;gap:30px;flex-wrap:wrap;align-items:center;padding:16px 0}
.brand-strip-item{padding:10px 22px;background:var(--bg-glass);border:1px solid var(--border-default);border-radius:6px;font-size:.85rem;color:var(--text-muted);font-weight:500;transition:all .25s;display:flex;align-items:center;gap:8px}
.brand-strip-item:hover{border-color:var(--border-cyan);color:var(--cyan)}

/* -- Section Intro -- */
.section-intro{text-align:center;margin-bottom:44px}
.section-intro .section-subtitle{margin:0 auto}

/* -- Page Header -- */
.page-header{padding:110px 0 50px;text-align:center;background:var(--bg-secondary);position:relative;overflow:hidden}
.page-header::before{content:'';position:absolute;top:-20%;right:-10%;width:350px;height:350px;background:radial-gradient(circle,rgba(6,182,212,.04),transparent 70%);pointer-events:none}
.page-header h1{font-size:clamp(1.6rem,3vw,2.4rem);font-weight:800;margin-bottom:10px}
.page-header p{color:var(--text-secondary);max-width:520px;margin:0 auto}

/* -- Table -- */
.data-table{width:100%;border-collapse:collapse;background:var(--bg-card);border-radius:var(--radius-md);overflow:hidden}
.data-table thead{background:var(--bg-tertiary)}
.data-table th{padding:14px 18px;text-align:left;font-size:.82rem;font-weight:700;color:var(--cyan);letter-spacing:1px;text-transform:uppercase}
.data-table td{padding:12px 18px;font-size:.88rem;border-top:1px solid var(--border-default);color:var(--text-secondary)}
.data-table tr:hover td{background:var(--bg-glass)}
.status-badge{display:inline-block;padding:2px 10px;border-radius:3px;font-size:.72rem;font-weight:600}
.status-hot{background:rgba(225,29,72,.12);color:var(--rose-light)}
.status-active{background:rgba(6,182,212,.12);color:var(--cyan-light)}
.status-new{background:rgba(34,197,94,.12);color:#4ade80}

/* -- Footer -- */
.site-footer{background:var(--bg-primary);border-top:1px solid var(--border-default);padding:50px 0 24px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:36px;margin-bottom:32px}
.footer-brand p{font-size:.88rem;color:var(--text-muted);margin-top:12px;line-height:1.7}
.footer-col h4{font-size:.92rem;font-weight:700;margin-bottom:16px;color:var(--text-primary)}
.footer-col a{display:block;padding:4px 0;font-size:.85rem;color:var(--text-muted)!important;transition:color .25s}
.footer-col a:hover{color:var(--cyan)!important}
.footer-bottom{border-top:1px solid var(--border-default);padding-top:20px;display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:10px}
.footer-bottom p{font-size:.8rem;color:var(--text-muted)}
.footer-social{display:flex;gap:10px}
.footer-social a{width:34px;height:34px;border-radius:50%;background:var(--bg-glass);border:1px solid var(--border-default);display:flex;align-items:center;justify-content:center;color:var(--text-muted)!important;transition:all .25s}
.footer-social a:hover{border-color:var(--cyan);color:var(--cyan)!important;background:var(--cyan-glow)}

/* -- Tagline Banner -- */
.tagline-banner{
  background:var(--bg-tertiary);text-align:center;padding:40px 20px;
  position:relative;overflow:hidden;border-top:1px solid var(--border-cyan);
  border-bottom:1px solid var(--border-cyan)
}
.tagline-banner::before{content:'';position:absolute;inset:0;background:repeating-linear-gradient(45deg,transparent,transparent 20px,rgba(6,182,212,.02) 20px,rgba(6,182,212,.02) 21px);pointer-events:none}
.tagline-text{font-size:clamp(1.2rem,3vw,2rem);font-weight:900;letter-spacing:4px;background:var(--grad-cyan);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.tagline-sub{font-size:.9rem;color:var(--text-muted);margin-top:8px;letter-spacing:2px}

/* -- Reveal Animation -- */
.reveal{opacity:0;transform:translateY(24px);transition:all .7s ease}
.reveal.visible{opacity:1;transform:translateY(0)}

/* -- Unique Module: Hex Grid -- */
.hex-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.hex-item{text-align:center;padding:24px;border:1px solid var(--border-default);border-radius:var(--radius-md);background:var(--bg-card);position:relative;transition:all .3s}
.hex-item:hover{border-color:var(--border-cyan);box-shadow:var(--shadow-cyan);transform:translateY(-2px)}
.hex-icon{width:56px;height:56px;margin:0 auto 12px;border-radius:12px;background:var(--grad-cyan);display:flex;align-items:center;justify-content:center;font-size:1.5rem;color:#05080f}

/* -- Responsive -- */
@media(max-width:1024px){
  .grid-4{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr 1fr}
  .feature-split{gap:32px}
  .hex-grid{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:768px){
  .nav-links,.nav-cta{display:none}
  .nav-links.open{display:flex}
  .nav-links.open{position:absolute;top:70px;left:0;right:0;flex-direction:column;background:rgba(5,8,15,.98);backdrop-filter:blur(20px);padding:16px 20px;border-bottom:1px solid var(--border-default);gap:4px}
  .nav-toggle{display:flex}
  .grid-2,.grid-3,.grid-4{grid-template-columns:1fr}
  .hex-grid{grid-template-columns:1fr}
  .stats-grid{grid-template-columns:repeat(2,1fr)}
  .hero h1{font-size:clamp(1.6rem,7vw,2.2rem)}
  .hero-stats{flex-wrap:wrap;gap:16px}
  .contact-grid{grid-template-columns:1fr}
  .feature-split{grid-template-columns:1fr}
  .feature-split.reverse{direction:ltr}
  .footer-grid{grid-template-columns:1fr;gap:24px}
  .footer-bottom{flex-direction:column;text-align:center}
  .hero-compact{min-height:35vh}
}
@media(max-width:480px){
  .hero-actions{flex-direction:column}
  .hero-actions .btn{width:100%;text-align:center}
  .cta-actions{flex-direction:column}
  .cta-actions .btn{width:100%;text-align:center}
  .stats-grid{gap:12px}
  .stat-number{font-size:2rem}
}