/* ============================================
   奥特维力 — V6 样式表（美化版）
   装饰图案 · 渐变背景 · 点缀元素
   ============================================ */

:root {
  --blue: #0071e3; --blue-dark: #005bb5; --blue-light: #e8f2fc;
  --bg: #ffffff; --bg-alt: #f5f5f7;
  --fg: #1d1d1f; --muted: #86868b; --border: #d2d2d7;
  --hero-gradient: linear-gradient(180deg, #0a1628 0%, #0d2247 30%, #0f2d5e 60%, #10346b 100%);
}

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{background:var(--bg);color:var(--fg);font:17px/1.47 -apple-system,BlinkMacSystemFont,'SF Pro Display','SF Pro Text','Helvetica Neue',Helvetica,Arial,sans-serif;letter-spacing:-0.022em;-webkit-font-smoothing:antialiased}

/* ===== NAV ===== */
.topnav{position:fixed;top:0;left:0;right:0;z-index:100;background:rgba(255,255,255,0.82);backdrop-filter:saturate(180%)blur(20px);-webkit-backdrop-filter:saturate(180%)blur(20px);border-bottom:1px solid rgba(0,0,0,0.06)}
.topnav-inner{max-width:1400px;margin:0 auto;padding:0 40px;display:flex;justify-content:space-between;align-items:center;height:48px}
.nav-brand{font-size:17px;font-weight:600;color:var(--fg);text-decoration:none}
.nav-links{display:flex;gap:32px;align-items:center}
.nav-link{color:var(--fg);opacity:.8;text-decoration:none;font-size:13px;transition:color .3s}
.nav-link:hover{color:var(--blue);opacity:1}
.nav-link.active{color:var(--blue);opacity:1;font-weight:500}
.nav-cta{margin-left:16px;font-size:12px;font-weight:600;color:#fff;background:var(--blue);padding:6px 16px;border-radius:980px;text-decoration:none;transition:background .2s}
.nav-cta:hover{background:var(--blue-dark)}
.mobile-menu-btn{display:none;background:none;border:none;color:var(--fg);padding:4px}
@media(max-width:768px){.nav-links{display:none}.nav-links.open{display:flex;flex-direction:column;position:absolute;top:48px;left:0;right:0;background:rgba(255,255,255,.98);padding:8px 0;border-bottom:1px solid var(--border)}.nav-links.open .nav-link{padding:12px 40px;font-size:15px;border-top:1px solid var(--border);color:var(--fg)}.nav-links.open .nav-link:first-child{border-top:none}.mobile-menu-btn{display:block}}

/* ===== HERO ===== */
.hero{min-height:100vh;display:flex;align-items:center;position:relative;overflow:hidden;background:var(--hero-gradient)}
.hero-bg{position:absolute;inset:0;opacity:.6;z-index:1;background-image:radial-gradient(circle at 20% 30%,rgba(0,113,227,.08) 0%,transparent 50%),radial-gradient(circle at 80% 70%,rgba(0,113,227,.12) 0%,transparent 50%),radial-gradient(circle at 50% 50%,rgba(26,138,255,.04) 0%,transparent 70%);background-size:100% 100%,100% 100%,200px 200px}
.hero-dots{position:absolute;inset:0;z-index:1;opacity:.15;background-image:radial-gradient(rgba(255,255,255,.3) 1px,transparent 1px);background-size:40px 40px}
.hero-img{position:absolute;top:48px;left:0;right:0;bottom:0;z-index:2}
.hero-img img{width:100%;height:100%;object-fit:cover;object-position:right center}
.hero-mask{position:absolute;inset:0;z-index:3;background:linear-gradient(90deg,rgba(10,22,40,.92) 0%,rgba(10,22,40,.5) 40%,transparent 70%)}
.hero-body{position:relative;z-index:4;max-width:1600px;margin:0 auto;padding:0 80px;width:100%}
.hero-text{max-width:720px;animation:fadeUp 1s ease-out}
.hero-text h1{font-size:clamp(48px,6vw,80px);font-weight:700;line-height:1.03;letter-spacing:-0.025em;color:#fff;margin-bottom:24px}
.hero-lead{font-size:21px;line-height:1.5;color:rgba(255,255,255,.7);margin-bottom:40px;max-width:44ch}
.hero-cta{display:flex;gap:16px}
@keyframes fadeUp{from{opacity:0;transform:translateY(30px)}to{opacity:1;transform:translateY(0)}}
@media(max-width:920px){.hero{min-height:auto;padding:120px 0 80px}.hero-body{padding:0 24px;text-align:center}.hero-text{max-width:100%}.hero-cta{justify-content:center}.hero-img img{object-position:center center}.hero-mask{background:rgba(10,22,40,.7)}}

/* ===== COMMON ===== */
.container{max-width:1400px;margin:0 auto;padding:0 40px}
.section{padding:140px 0;position:relative;overflow:hidden}
.section-white{background:var(--bg)}
.section-gray{background:var(--bg-alt)}
.section-blue{background:linear-gradient(135deg,#e8f2fc 0%,#dceaf8 50%,#f0f5fc 100%)}
.section-dark{background:var(--hero-gradient);color:#fff}
@media(max-width:920px){.section{padding:80px 0}.container{padding:0 24px}}

.sec-title{font-size:clamp(32px,3.5vw,48px);font-weight:700;line-height:1.1;letter-spacing:-0.02em;margin-bottom:20px}
.sec-lead{font-size:17px;line-height:1.55;color:var(--muted);max-width:52ch}
.sec-title-light{color:#fff}
.sec-lead-light{color:rgba(255,255,255,.7)}
.text-center{text-align:center}
.mx-auto{margin-left:auto;margin-right:auto}

/* ===== SECTION DECORATORS ===== */
.section-deco{position:absolute;pointer-events:none;z-index:0}
.deco-dots{width:120px;height:120px;background-image:radial-gradient(var(--blue) 1.5px,transparent 1.5px);background-size:16px 16px;opacity:.08}
.deco-circle{width:200px;height:200px;border-radius:50%;border:1px solid rgba(0,113,227,.08)}
.deco-line{width:300px;height:1px;background:linear-gradient(90deg,transparent,rgba(0,113,227,.1),transparent)}
.deco-blob{width:400px;height:400px;border-radius:50%;background:radial-gradient(circle,rgba(0,113,227,.04) 0%,transparent 70%)}

/* ===== BUTTONS ===== */
.btn{display:inline-flex;align-items:center;justify-content:center;font:15px/1.47 -apple-system,BlinkMacSystemFont,'SF Pro Text','Helvetica Neue',sans-serif;font-weight:500;letter-spacing:-0.01em;padding:12px 28px;border-radius:980px;border:none;cursor:pointer;text-decoration:none;transition:all .2s}
.btn:active{transform:scale(.97)}
.btn-primary{background:var(--blue);color:#fff}
.btn-primary:hover{background:var(--blue-dark)}
.btn-ghost{background:transparent;color:#fff;border:1.5px solid rgba(255,255,255,.4)}
.btn-ghost:hover{background:rgba(255,255,255,.1);border-color:rgba(255,255,255,.6)}
.btn-outline{background:transparent;color:var(--blue);border:1.5px solid var(--blue)}
.btn-outline:hover{background:var(--blue);color:#fff}

/* ===== GRID ===== */
.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:32px}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
@media(max-width:920px){.grid-2,.grid-3,.grid-4{grid-template-columns:1fr}}
@media(min-width:768px) and (max-width:1080px){.grid-3{grid-template-columns:repeat(2,1fr)}}

/* ===== CARDS ===== */
.card{background:var(--bg);border-radius:20px;padding:36px;box-shadow:0 1px 3px rgba(0,0,0,.04);border:1px solid var(--border);position:relative;transition:box-shadow .2s,border-color .2s}
.card:hover{border-color:rgba(0,113,227,.2);box-shadow:0 4px 16px rgba(0,113,227,.06)}
.card-dark{background:rgba(255,255,255,.06);border-radius:20px;padding:36px;border:1px solid rgba(255,255,255,.08);transition:border-color .2s}
.card-dark:hover{border-color:rgba(255,255,255,.15)}
.card-icon{width:44px;height:44px;border-radius:12px;background:var(--blue-light);display:flex;align-items:center;justify-content:center;margin-bottom:24px;color:var(--blue)}
.card-dark .card-icon{background:rgba(255,255,255,.1);color:var(--blue)}
.card h3{font-size:19px;font-weight:600;margin-bottom:10px}
.card p{font-size:14px;color:var(--muted);line-height:1.65}
.card-dark h3{font-size:19px;font-weight:600;margin-bottom:10px;color:#fff}
.card-dark p{font-size:14px;color:rgba(255,255,255,.65);line-height:1.65}

/* ===== CARD SHIMMER LINE ===== */
.card::after{content:'';position:absolute;top:0;left:20px;right:20px;height:1px;background:linear-gradient(90deg,transparent,rgba(0,113,227,.12),transparent);opacity:0;transition:opacity .3s}
.card:hover::after{opacity:1}

/* ===== INDICATION LIST ===== */
.indication-list{list-style:none;display:grid;grid-template-columns:1fr 1fr;gap:8px}
.indication-list li{display:flex;align-items:center;gap:10px;font-size:15px;padding:6px 0}
.indication-list li::before{content:'';width:8px;height:8px;border-radius:50%;background:var(--blue);flex-shrink:0}
@media(max-width:640px){.indication-list{grid-template-columns:1fr}}

/* ===== STAT GRID ===== */
.stat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.stat-card{text-align:center;padding:20px;position:relative}
.stat-card::after{content:'';position:absolute;bottom:0;left:25%;right:25%;height:2px;background:linear-gradient(90deg,transparent,var(--blue-light),transparent);border-radius:1px}
.stat-card-num{font-size:40px;font-weight:700;color:var(--blue);letter-spacing:-0.03em;line-height:1}
.stat-card-label{font-size:13px;color:var(--muted);margin-top:8px}
@media(max-width:920px){.stat-grid{grid-template-columns:repeat(2,1fr)}}

/* ===== PRODUCT GRID ===== */
.product-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:28px}
.product-card{background:var(--bg);border-radius:24px;overflow:hidden;box-shadow:0 2px 8px rgba(0,0,0,.04);border:1px solid var(--border);display:flex;flex-direction:column;transition:transform .3s,box-shadow .3s;position:relative}
.product-card::before{content:'';position:absolute;top:0;left:0;right:0;height:3px;background:linear-gradient(90deg,var(--blue),rgba(0,113,227,.2));opacity:0;transition:opacity .3s}
.product-card:hover{transform:translateY(-6px);box-shadow:0 16px 40px rgba(0,113,227,.1)}
.product-card:hover::before{opacity:1}
.product-card-img{aspect-ratio:4/3;background:linear-gradient(160deg,var(--blue-light) 0%,#f0f5fc 100%);display:flex;align-items:center;justify-content:center;overflow:hidden;padding:24px}
.product-card-img img{width:100%;height:100%;object-fit:contain}
.product-card-body{padding:24px;flex:1;display:flex;flex-direction:column}
.product-card-model{font-family:'SF Mono','Menlo',monospace;font-size:12px;font-weight:600;color:var(--blue);letter-spacing:.02em;margin-bottom:6px}
.product-card-name{font-size:17px;font-weight:600;margin-bottom:8px}
.product-card-desc{font-size:13px;color:var(--muted);line-height:1.5;margin-bottom:16px;flex:1}
.product-card-tags{display:flex;gap:6px;flex-wrap:wrap;margin-bottom:16px}
.product-card-footer{margin-top:auto}
.product-card-footer .btn{font-size:13px;padding:8px 18px}
.tag{display:inline-block;font-size:11px;font-weight:600;letter-spacing:.02em;background:var(--blue-light);color:var(--blue);padding:4px 10px;border-radius:980px}
@media(max-width:920px){.product-grid{grid-template-columns:1fr}}
@media(min-width:768px) and (max-width:1080px){.product-grid{grid-template-columns:repeat(2,1fr)}}

/* ===== ABOUT SPLIT ===== */
.about-split{display:grid;grid-template-columns:1fr 1fr;min-height:640px}
.about-split-image{overflow:hidden;position:relative}
.about-split-image img{width:100%;height:100%;object-fit:cover}
.about-split-image::after{content:'';position:absolute;inset:0;background:linear-gradient(90deg,transparent 85%,var(--bg) 100%)}
.about-split-content{display:flex;flex-direction:column;justify-content:center;padding:80px 80px;background:var(--bg);max-width:700px;margin:0 auto}
.about-split-content h2{font-size:clamp(32px,3.5vw,52px);font-weight:700;line-height:1.08;letter-spacing:-0.025em;margin-bottom:24px}
.about-split-content p{font-size:16px;color:var(--muted);line-height:1.65;margin-bottom:16px}
.about-split-content .stat-grid{margin-top:24px}
.about-split-content .stat-card-num{font-size:32px}
@media(max-width:920px){.about-split{grid-template-columns:1fr;min-height:auto}.about-split-image{aspect-ratio:16/9}.about-split-content{padding:48px 24px}}

/* ===== CALLOUT ===== */
.callout{background:linear-gradient(135deg,var(--blue-light) 0%,rgba(0,113,227,.04) 100%);border-left:4px solid var(--blue);padding:20px 24px;border-radius:0 16px 16px 0;margin-top:40px}
.callout p{font-size:14px;color:var(--fg);line-height:1.6}

/* ===== FOOTER ===== */
.pagefoot{padding:40px;text-align:center;font-size:12px;color:var(--muted);border-top:1px solid var(--border);line-height:1.8;background:var(--bg);position:relative}
.pagefoot::before{content:'';position:absolute;top:0;left:50%;transform:translateX(-50%);width:60px;height:3px;background:linear-gradient(90deg,transparent,var(--blue),transparent);border-radius:2px}

/* ===== TYPOGRAPHY ===== */
em.highlight{font-style:normal;color:var(--blue);font-weight:600}

.mt-16{margin-top:16px}.mt-24{margin-top:24px}.mt-32{margin-top:32px}.mt-48{margin-top:48px}.mt-64{margin-top:64px}
.mb-16{margin-bottom:16px}.mb-24{margin-bottom:24px}.mb-32{margin-bottom:32px}.mb-48{margin-bottom:48px}.mb-64{margin-bottom:64px}

:focus-visible{outline:3px solid var(--blue);outline-offset:2px}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}

/* ===== SUB-PAGE STYLES ===== */
.page-hero{padding:160px 0 96px;text-align:center;background:var(--hero-gradient);color:#fff;position:relative;overflow:hidden}
.page-hero::before{content:'';position:absolute;inset:0;background:radial-gradient(ellipse 60% 50% at 50% 40%,rgba(0,113,227,.2) 0%,transparent 70%);background-image:radial-gradient(circle at 30% 30%,rgba(0,113,227,.06) 0%,transparent 50%),radial-gradient(circle at 70% 60%,rgba(0,113,227,.08) 0%,transparent 50%);background-size:100% 100%,300px 300px,400px 400px}
.page-hero .container{position:relative;z-index:1}
.page-hero h1{font-size:clamp(40px,5vw,64px);font-weight:700;line-height:1.08;letter-spacing:-0.025em;margin-bottom:20px;color:#fff}
.page-hero p{font-size:19px;line-height:1.5;max-width:48ch;margin:0 auto;color:rgba(255,255,255,.6)}
.page-hero-eyebrow{font-size:17px;font-weight:600;letter-spacing:-0.01em;color:var(--blue);margin-bottom:20px}
@media(max-width:920px){.page-hero{padding:120px 0 64px}}

.section-alt{background:var(--bg-alt)}
.eyebrow{font-size:13px;font-weight:600;letter-spacing:.08em;text-transform:uppercase;color:var(--blue);margin-bottom:12px}

.feature-row{display:grid;grid-template-columns:1fr 1fr;gap:64px;align-items:center}
.feature-text h2{font-size:clamp(28px,3.5vw,44px);font-weight:700;line-height:1.1;letter-spacing:-0.02em;margin-bottom:20px}
.feature-text p{color:var(--muted);font-size:15px;line-height:1.65;margin-bottom:20px}
@media(max-width:920px){.feature-row{grid-template-columns:1fr;gap:40px}}

.timeline{position:relative;padding-left:56px}
.timeline::before{content:'';position:absolute;left:19px;top:8px;bottom:8px;width:1px;background:linear-gradient(180deg,var(--blue),rgba(0,113,227,.2),var(--border))}
.tl-item{position:relative;margin-bottom:48px}
.tl-item:last-child{margin-bottom:0}
.tl-dot{position:absolute;left:-56px;top:6px;width:14px;height:14px;border-radius:50%;background:var(--blue);border:4px solid var(--bg-alt);box-shadow:0 0 0 4px rgba(0,113,227,.15);z-index:1}
.tl-year{font-family:'SF Mono','Menlo',monospace;font-size:15px;font-weight:600;color:var(--blue);letter-spacing:.02em;margin-bottom:6px}
.tl-title{font-size:21px;font-weight:600;margin-bottom:6px}
.tl-desc{font-size:15px;color:var(--muted);max-width:52ch;line-height:1.6}

.welfare-list{max-width:800px;margin:0 auto}
.welfare-item{display:flex;gap:24px;padding:32px 0;border-top:1px solid var(--border);align-items:flex-start}
.welfare-item:first-child{border-top:none;padding-top:0}
.welfare-icon{flex-shrink:0;width:48px;height:48px;border-radius:50%;background:var(--blue-light);display:flex;align-items:center;justify-content:center;color:var(--blue)}
.welfare-content h4{font-size:19px;font-weight:600;margin-bottom:6px}
.welfare-content p{font-size:15px;color:var(--muted);line-height:1.6}
@media(max-width:920px){.welfare-item{flex-direction:column;gap:16px}}

.breadcrumb{padding:72px 0 0;font-size:13px;color:var(--muted);display:flex;gap:8px;align-items:center}
.breadcrumb a{color:var(--blue);text-decoration:none}
.breadcrumb a:hover{text-decoration:underline}

.spec-table{width:100%;border-collapse:collapse}
.spec-table th,.spec-table td{text-align:left;padding:14px 0;font-size:15px;border-bottom:1px solid var(--border)}
.spec-table th{width:180px;color:var(--muted);font-weight:500;font-size:14px}

.product-detail-grid{display:grid;grid-template-columns:1fr 1fr;gap:64px;align-items:center}
.product-detail-grid .product-img{min-height:420px;border-radius:24px;background:linear-gradient(160deg,var(--blue-light) 0%,#f0f5fc 100%)}
@media(max-width:920px){.product-detail-grid{grid-template-columns:1fr}}

.product-img{background:linear-gradient(160deg,var(--blue-light) 0%,#f0f5fc 100%);border-radius:24px;overflow:hidden;display:flex;align-items:center;justify-content:center}
.product-img img{width:100%;height:100%;object-fit:contain;padding:32px}
.product-img.ratio-4-3{aspect-ratio:4/3}

.feature-img{border-radius:24px;overflow:hidden;background:var(--bg-alt);min-height:360px;display:flex;align-items:center;justify-content:center}
.feature-img img{width:100%;height:100%;object-fit:cover}
.feature-img-placeholder{border-radius:24px;min-height:360px;display:flex;align-items:center;justify-content:center;background:linear-gradient(160deg,var(--blue-light) 0%,#f0f5fc 100%);color:var(--muted);font-size:13px}

.container{max-width:1400px}
@media(min-width:1600px){.container{max-width:1500px}}
@media(max-width:920px){.container{padding:0 24px}}