/* ===================================
   千云AI V3 Ultra — 白色系极致炫酷版
   =================================== */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=JetBrains+Mono:wght@400;500;600&family=Outfit:wght@300;400;500;600;700;800;900&display=swap');

:root {
  --primary: #E63946;
  --primary-light: #FF6B6B;
  --accent-blue: #3B82F6;
  --accent-purple: #8B5CF6;
  --accent-cyan: #06B6D4;
  --text-main: #0F0F12;
  --text-muted: #6B7280;
  --bg: #FAFAFE;
  --card-bg: rgba(255,255,255,0.55);
  --border: rgba(0,0,0,0.06);
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:'Outfit',sans-serif;background:var(--bg);color:var(--text-main);overflow-x:hidden;-webkit-font-smoothing:antialiased}

/* ---- 滚动进度条 ---- */
.scroll-progress{position:fixed;top:0;left:0;height:3px;z-index:9999;
  background:linear-gradient(90deg,var(--primary),var(--primary-light),#FF2D55,var(--primary));
  background-size:300%;animation:rainbowBar 4s linear infinite;transition:width 0.1s;width:0}
@keyframes rainbowBar{0%{background-position:0% 50%}100%{background-position:300% 50%}}

/* ---- 动态渐变Blob背景 ---- */
.blob-bg{position:fixed;inset:0;z-index:-1;overflow:hidden;pointer-events:none}
.blob{position:absolute;border-radius:50%;filter:blur(80px);opacity:0.5;will-change:transform}
.blob-1{width:600px;height:600px;background:linear-gradient(135deg,rgba(230,57,70,0.18),rgba(255,107,107,0.1));top:-10%;left:-5%;animation:blobFloat1 20s ease-in-out infinite}
.blob-2{width:500px;height:500px;background:linear-gradient(135deg,rgba(230,57,70,0.08),rgba(255,45,85,0.1));top:30%;right:-10%;animation:blobFloat2 25s ease-in-out infinite}
.blob-3{width:450px;height:450px;background:linear-gradient(135deg,rgba(230,57,70,0.06),rgba(198,40,40,0.06));bottom:-5%;left:30%;animation:blobFloat3 22s ease-in-out infinite}
@keyframes blobFloat1{0%,100%{transform:translate(0,0) scale(1)}33%{transform:translate(80px,50px) scale(1.1)}66%{transform:translate(-40px,80px) scale(0.95)}}
@keyframes blobFloat2{0%,100%{transform:translate(0,0) scale(1)}33%{transform:translate(-60px,70px) scale(1.15)}66%{transform:translate(50px,-40px) scale(0.9)}}
@keyframes blobFloat3{0%,100%{transform:translate(0,0) scale(1)}50%{transform:translate(70px,-60px) scale(1.1)}}

/* ---- 鼠标追光效果 ---- */
.cursor-glow{position:fixed;width:400px;height:400px;border-radius:50%;pointer-events:none;z-index:0;
  background:radial-gradient(circle,rgba(230,57,70,0.06),transparent 70%);
  transform:translate(-50%,-50%);transition:left 0.5s ease-out,top 0.5s ease-out}

/* ---- 导航栏 ---- */
.nav-v3{position:fixed;top:0;left:0;width:100%;z-index:100;padding:20px 0;transition:all 0.4s cubic-bezier(0.16,1,0.3,1)}
.nav-v3.scrolled{padding:8px 0;background:rgba(255,255,255,0.7);backdrop-filter:blur(24px) saturate(200%);border-bottom:1px solid var(--border);box-shadow:0 1px 20px rgba(0,0,0,0.03)}

.nav-logo{font-family:'Outfit',sans-serif;font-size:1.5rem;font-weight:800;text-decoration:none;
  background:linear-gradient(135deg,var(--text-main),var(--primary));-webkit-background-clip:text;-webkit-text-fill-color:transparent}

.nav-link{color:var(--text-muted);text-decoration:none;font-size:0.9rem;font-weight:500;
  transition:all 0.3s;padding:6px 14px;border-radius:10px}
.nav-link:hover{color:var(--primary);background:rgba(230,57,70,0.06)}
.nav-link.active{color:var(--primary);background:rgba(230,57,70,0.08);font-weight:600}

.btn-nav{background:linear-gradient(135deg,var(--primary),#FF2D55);color:#fff;padding:10px 26px;border-radius:50px;font-weight:600;font-size:0.9rem;text-decoration:none;
  transition:all 0.4s;border:none;cursor:pointer;position:relative;overflow:hidden;box-shadow:0 4px 15px rgba(230,57,70,0.2)}
.btn-nav:hover{transform:translateY(-2px);box-shadow:0 10px 30px rgba(230,57,70,0.35)}
.btn-nav::after{content:'';position:absolute;top:0;left:-100%;width:100%;height:100%;background:linear-gradient(90deg,transparent,rgba(255,255,255,0.2),transparent);transition:left 0.5s}
.btn-nav:hover::after{left:100%}

/* 移动端菜单 */
.mobile-menu{display:flex;flex-direction:column;gap:4px;
  max-height:0;overflow:hidden;transition:max-height 0.5s cubic-bezier(0.16,1,0.3,1);
  background:rgba(255,255,255,0.95);backdrop-filter:blur(24px);padding:0 24px}
.mobile-menu.open{max-height:420px;padding:12px 24px 20px;border-top:1px solid var(--border)}
.mobile-menu-link{text-decoration:none;color:var(--text-muted);font-size:1rem;font-weight:500;
  padding:14px 16px;border-radius:14px;transition:all 0.3s}
.mobile-menu-link:hover,.mobile-menu-link:active{color:var(--primary);background:rgba(230,57,70,0.06)}
/* 汉堡按钮X变换 */
#menuBtn.active span:nth-child(1){transform:translateY(7px) rotate(45deg)}
#menuBtn.active span:nth-child(2){opacity:0}
#menuBtn.active span:nth-child(3){width:22px;transform:translateY(-7px) rotate(-45deg)}

/* ---- HERO ---- */
.hero-v3{min-height:100vh;display:flex;align-items:center;position:relative;overflow:hidden;padding:120px 0 80px}

/* 动态渐变文字 */
.text-rainbow{background:linear-gradient(90deg,var(--primary),var(--primary-light),#FF2D55,#C62828,var(--primary));
  background-size:300%;-webkit-background-clip:text;-webkit-text-fill-color:transparent;
  animation:textShimmer 5s ease infinite}
@keyframes textShimmer{0%,100%{background-position:0% 50%}50%{background-position:100% 50%}}

/* 打字机光标 */
.typed-cursor{display:inline-block;width:3px;height:0.8em;background:var(--primary);margin-left:3px;
  animation:cursorBlink 1s step-end infinite;vertical-align:text-bottom;
  box-shadow:0 0 8px rgba(230,57,70,0.4)}
@keyframes cursorBlink{50%{opacity:0}}

.hero-badge{display:inline-flex;align-items:center;gap:8px;padding:8px 20px;border-radius:50px;margin-bottom:24px;
  background:rgba(255,255,255,0.7);backdrop-filter:blur(10px);border:1px solid var(--border);
  font-size:0.85rem;font-weight:600;box-shadow:0 4px 15px rgba(0,0,0,0.03)}
.hero-badge-dot{width:8px;height:8px;border-radius:50%;background:var(--primary);animation:badgePulse 2s ease infinite}
@keyframes badgePulse{0%,100%{box-shadow:0 0 0 0 rgba(230,57,70,0.4)}50%{box-shadow:0 0 0 8px rgba(230,57,70,0)}}

.hero-title{font-size:clamp(2.5rem,5.5vw,5rem);font-weight:900;line-height:1.08;letter-spacing:-2px;margin-bottom:1.5rem}
.hero-subtitle{font-size:1.2rem;color:var(--text-muted);line-height:1.7;max-width:550px;font-weight:400}

/* ---- 3D悬浮终端 (棱镜折射边框) ---- */
.prism-card{position:relative;border-radius:24px;overflow:hidden;
  box-shadow:0 40px 80px -15px rgba(0,0,0,0.08);
  transform:perspective(1200px) rotateY(-8deg) rotateX(4deg);
  transition:transform 0.7s cubic-bezier(0.16,1,0.3,1),box-shadow 0.5s;will-change:transform}
.prism-card:hover{transform:perspective(1200px) rotateY(0) rotateX(0);box-shadow:0 50px 100px -20px rgba(0,0,0,0.12)}
/* 棱镜彩虹边框 */
.prism-card::before{content:'';position:absolute;inset:-2px;border-radius:26px;z-index:-1;
  background:conic-gradient(from 0deg,var(--primary),var(--primary-light),#FF2D55,#C62828,var(--primary-light),var(--primary));
  animation:prismSpin 6s linear infinite;opacity:0.5;transition:opacity 0.4s}
.prism-card:hover::before{opacity:1}
@keyframes prismSpin{100%{transform:rotate(360deg)}}
.prism-card-inner{background:rgba(255,255,255,0.92);backdrop-filter:blur(20px);border-radius:24px;overflow:hidden}

.terminal-header{display:flex;align-items:center;padding:16px 24px;background:rgba(245,245,247,0.8);border-bottom:1px solid var(--border)}
.mac-btn{width:12px;height:12px;border-radius:50%;margin-right:8px}
.mac-btn.c{background:#FF5F56}.mac-btn.m{background:#FFBD2E}.mac-btn.x{background:#27C93F}
.terminal-body{padding:28px 32px;font-family:'JetBrains Mono',monospace;font-size:0.88rem;line-height:1.85;color:#333}
.t-kw{color:#E63946;font-weight:600}.t-str{color:#0284C7}.t-fn{color:#059669}.t-cm{color:#9CA3AF}

/* ---- 追光卡片 (Spotlight Card) ---- */
.spotlight-card{background:var(--card-bg);backdrop-filter:blur(16px);border:1px solid var(--border);
  border-radius:28px;padding:48px 36px;position:relative;overflow:hidden;
  transition:all 0.5s cubic-bezier(0.16,1,0.3,1)}
.spotlight-card::after{content:'';position:absolute;inset:0;opacity:0;transition:opacity 0.5s;pointer-events:none;
  background:radial-gradient(circle 250px at var(--mx,50%) var(--my,50%),rgba(230,57,70,0.08),transparent)}
.spotlight-card:hover::after{opacity:1}
.spotlight-card:hover{transform:translateY(-10px);box-shadow:0 25px 50px rgba(0,0,0,0.06);border-color:rgba(230,57,70,0.12)}

.feat-icon{width:60px;height:60px;border-radius:18px;display:flex;align-items:center;justify-content:center;
  font-size:1.4rem;margin-bottom:28px;position:relative}
.feat-icon::after{content:'';position:absolute;inset:-8px;border-radius:26px;background:inherit;filter:blur(18px);z-index:-1;opacity:0.4}

/* ---- 波浪SVG分隔线 ---- */
.wave-divider{position:relative;width:100%;overflow:hidden;line-height:0;margin:-1px 0}
.wave-divider svg{display:block;width:100%;height:auto}

/* ---- 模型卡片 ---- */
.model-card-v3{background:#fff;border-radius:24px;padding:32px;border:1px solid var(--border);
  transition:all 0.45s cubic-bezier(0.16,1,0.3,1);position:relative;overflow:hidden}
.model-card-v3::before{content:'';position:absolute;top:0;left:25%;right:25%;height:2px;
  background:linear-gradient(90deg,transparent,var(--primary),transparent);opacity:0;transition:opacity 0.4s}
.model-card-v3:hover::before{opacity:1}
.model-card-v3:hover{transform:translateY(-8px) scale(1.02);box-shadow:0 25px 50px rgba(0,0,0,0.06)}

.model-icon-wrap{width:52px;height:52px;border-radius:16px;display:flex;align-items:center;justify-content:center;font-size:1.4rem}

/* ---- 统计 ---- */
.stat-v3{text-align:center;padding:48px 20px;position:relative}
.stat-v3::after{content:'';position:absolute;right:0;top:25%;bottom:25%;width:1px;background:var(--border)}
.stat-v3:last-child::after{display:none}
.stat-num{font-family:'Outfit',sans-serif;font-size:clamp(3rem,5vw,5rem);font-weight:900;letter-spacing:-2px;
  background:linear-gradient(135deg,var(--text-main),var(--primary),var(--primary-light));-webkit-background-clip:text;-webkit-text-fill-color:transparent;line-height:1}

/* ---- 定价 ---- */
.pricing-card{background:#fff;border-radius:32px;padding:48px;border:1px solid var(--border);
  transition:all 0.5s cubic-bezier(0.16,1,0.3,1);position:relative;overflow:hidden}
.pricing-card:hover{transform:translateY(-8px);box-shadow:0 30px 60px rgba(0,0,0,0.06)}

/* 深色渐变推荐卡片 */
.pricing-hero-card{background:linear-gradient(145deg,#1a1a2e 0%,#16213e 40%,#0f3460 100%);
  border-radius:32px;padding:52px 40px;position:relative;overflow:hidden;
  box-shadow:0 30px 80px rgba(230,57,70,0.15),0 0 0 1px rgba(230,57,70,0.1);
  transition:all 0.5s cubic-bezier(0.16,1,0.3,1)}
.pricing-hero-card:hover{transform:translateY(-10px) scale(1.02);
  box-shadow:0 40px 100px rgba(230,57,70,0.25),0 0 0 1px rgba(230,57,70,0.2)}

.price-big{font-size:4.5rem;font-weight:900;letter-spacing:-3px;line-height:1;
  background:linear-gradient(135deg,var(--primary),#FF2D55);-webkit-background-clip:text;-webkit-text-fill-color:transparent}

.btn-v3{display:inline-flex;align-items:center;gap:10px;padding:18px 44px;border-radius:60px;
  font-weight:700;font-size:1.05rem;text-decoration:none;border:none;cursor:pointer;
  transition:all 0.4s cubic-bezier(0.16,1,0.3,1);position:relative;overflow:hidden}
.btn-v3-dark{background:linear-gradient(135deg,var(--primary),#FF2D55);color:#fff;box-shadow:0 10px 30px rgba(230,57,70,0.2)}
.btn-v3-dark:hover{transform:translateY(-4px);box-shadow:0 15px 40px rgba(230,57,70,0.4)}
.btn-v3-dark::after{content:'';position:absolute;top:0;left:-100%;width:100%;height:100%;
  background:linear-gradient(90deg,transparent,rgba(255,255,255,0.15),transparent);transition:left 0.5s}
.btn-v3-dark:hover::after{left:100%}
.btn-v3-glass{background:rgba(255,255,255,0.6);backdrop-filter:blur(10px);color:var(--text-main);border:1px solid var(--border)}
.btn-v3-glass:hover{background:#fff;transform:translateY(-4px);box-shadow:0 10px 30px rgba(0,0,0,0.05)}

/* ---- 分段控制器 ---- */
.seg-ctrl{background:rgba(0,0,0,0.04);border-radius:14px;padding:4px;display:inline-flex;position:relative;width:100%}
.seg-bg{position:absolute;top:4px;bottom:4px;left:4px;background:#fff;border-radius:10px;
  box-shadow:0 2px 8px rgba(0,0,0,0.08);transition:all 0.4s cubic-bezier(0.16,1,0.3,1);z-index:1}
.seg-item{flex:1;border:none;background:transparent;padding:12px 0;font-size:0.9rem;font-weight:600;
  color:var(--text-muted);cursor:pointer;position:relative;z-index:2;transition:color 0.3s;font-family:'Outfit',sans-serif}
.seg-item.active{color:var(--text-main)}

/* ---- Apple级滑块 ---- */
.slider-v3{-webkit-appearance:none;width:100%;height:8px;border-radius:4px;background:#E5E7EB;outline:none;cursor:pointer;margin:14px 0}
.slider-v3::-webkit-slider-thumb{-webkit-appearance:none;width:28px;height:28px;border-radius:50%;background:#fff;
  border:2px solid var(--primary);cursor:pointer;box-shadow:0 2px 10px rgba(0,0,0,0.1),0 0 0 4px rgba(230,57,70,0.1);
  margin-top:-10px;transition:box-shadow 0.3s,transform 0.2s}
.slider-v3::-webkit-slider-thumb:hover{box-shadow:0 2px 15px rgba(0,0,0,0.15),0 0 0 6px rgba(230,57,70,0.15);transform:scale(1.1)}
.slider-v3::-webkit-slider-runnable-track{height:8px;border-radius:4px}

/* ---- 代码块 ---- */
.code-block-v3{background:#fff;border:1px solid var(--border);border-radius:20px;overflow:hidden;
  box-shadow:0 10px 30px rgba(0,0,0,0.03);position:relative}
.code-block-v3 pre{padding:28px 32px;margin:0;font-family:'JetBrains Mono',monospace;font-size:0.88rem;line-height:1.85;overflow-x:auto}

/* ---- FAQ ---- */
.faq-item{border-bottom:1px solid var(--border);padding:28px 0;cursor:pointer}
.faq-q{font-size:1.15rem;font-weight:600;display:flex;justify-content:space-between;align-items:center;transition:color 0.3s}
.faq-q:hover{color:var(--primary)}
.faq-icon{width:32px;height:32px;min-width:32px;border-radius:50%;background:rgba(0,0,0,0.04);display:flex;
  align-items:center;justify-content:center;transition:all 0.4s cubic-bezier(0.16,1,0.3,1);font-size:0.85rem}
.faq-item.open .faq-icon{transform:rotate(45deg);background:var(--primary);color:#fff}
.faq-a{max-height:0;overflow:hidden;transition:max-height 0.5s cubic-bezier(0.16,1,0.3,1);
  color:var(--text-muted);line-height:1.8;font-size:1rem}
.faq-item.open .faq-a{max-height:300px;padding-top:16px}

/* ---- 动画类 ---- */
.reveal{opacity:0;transform:translateY(50px);transition:all 1s cubic-bezier(0.16,1,0.3,1)}
.reveal.vis{opacity:1;transform:translateY(0)}
.rd1{transition-delay:0.1s}.rd2{transition-delay:0.2s}.rd3{transition-delay:0.25s}.rd4{transition-delay:0.35s}

/* ---- 跑马灯 ---- */
.marquee-wrap{overflow:hidden;mask-image:linear-gradient(90deg,transparent,black 10%,black 90%,transparent)}
.marquee-inner{display:flex;gap:20px;width:max-content;animation:marquee 35s linear infinite}
@keyframes marquee{0%{transform:translateX(0)}100%{transform:translateX(-50%)}}
.marquee-chip{display:flex;align-items:center;gap:10px;padding:14px 28px;border-radius:60px;
  background:rgba(255,255,255,0.7);backdrop-filter:blur(10px);border:1px solid var(--border);
  font-size:0.95rem;font-weight:600;color:var(--text-main);white-space:nowrap;flex-shrink:0;
  box-shadow:0 2px 8px rgba(0,0,0,0.02);transition:all 0.3s}
.marquee-chip:hover{box-shadow:0 8px 20px rgba(0,0,0,0.05);transform:translateY(-2px)}

/* ---- 响应式 ---- */
@media(max-width:768px){
  .prism-card{transform:none!important}
  .stat-v3::after{display:none}
  .stat-v3{border-bottom:1px solid var(--border);padding:28px 16px}
  .stat-v3:last-child{border-bottom:none}
}