/* =====================================================================
   RAVS Tools — Dark + Apple-minimal design system
   深色 + 苹果式极简设计系统 (中英双语)
   ===================================================================== */

:root{
  /* 背景 / Backgrounds */
  --bg:#08080a;            /* 页面最深底 */
  --bg-2:#101012;          /* 次级分区 */
  --card:#161618;          /* 卡片 */
  --card-2:#1c1c20;        /* 卡片悬浮态 */
  --line:rgba(255,255,255,.08);
  --line-strong:rgba(255,255,255,.16);

  /* 文本 / Text */
  --txt:#f5f5f7;           /* 苹果近白 */
  --txt-2:#a1a1a6;         /* 苹果次级灰 */
  --txt-3:#6e6e73;         /* 弱灰 */

  /* 强调 / Accent (克制使用, 如苹果蓝之于苹果) */
  --accent:#f5a623;       /* RAVS 标志橙 */
  --accent-2:#ff7a18;
  --accent-soft:rgba(245,166,35,.14);
  --buy:#f5a623;           /* Buy on Amazon 主色 */

  /* 几何 / Geometry */
  --radius:18px;
  --radius-sm:12px;
  --radius-lg:24px;
  --max:1180px;
  --ease:cubic-bezier(.4,0,.2,1);

  /* 字体 / Type */
  --sans:-apple-system,BlinkMacSystemFont,"SF Pro Display","SF Pro Text","Helvetica Neue",Helvetica,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",Arial,sans-serif;
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}
body{
  font-family:var(--sans);
  background:var(--bg);
  color:var(--txt);
  line-height:1.47;
  letter-spacing:-.01em;
  font-size:17px;
}
a{color:inherit;text-decoration:none;transition:color .2s var(--ease),opacity .2s var(--ease)}
img{max-width:100%;display:block}
button{font-family:inherit}
ul{list-style:none}
::selection{background:var(--accent);color:#08080a}

.container{max-width:var(--max);margin:0 auto;padding:0 24px}

/* ===================== Header / 导航 ===================== */
.site-header{
  position:sticky;top:0;z-index:100;
  background:rgba(8,8,10,.72);
  backdrop-filter:saturate(180%) blur(20px);
  -webkit-backdrop-filter:saturate(180%) blur(20px);
  border-bottom:1px solid var(--line);
}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:56px}
.logo{display:flex;align-items:baseline;gap:7px;letter-spacing:-.02em}
.logo-mark{font-weight:600;font-size:21px;letter-spacing:.02em}
.logo-sub{font-size:11px;letter-spacing:.32em;color:var(--txt-3);font-weight:500;text-transform:uppercase}
.main-nav{display:flex;gap:30px;align-items:center}
.main-nav a{font-size:13px;font-weight:400;color:var(--txt-2);letter-spacing:.01em}
.main-nav a:hover{color:var(--txt)}

/* 语言切换 / Language switcher */
.lang-switch{display:flex;align-items:center;gap:0;margin-left:6px;border:1px solid var(--line);border-radius:980px;overflow:hidden}
.lang-switch a{font-size:11px;font-weight:600;letter-spacing:.04em;padding:5px 11px;color:var(--txt-3)}
.lang-switch a.on{background:var(--txt);color:#08080a}

/* 购买亚马逊总入口 / Amazon store link in header */
.amzn-link{font-size:13px;color:var(--accent);font-weight:500}

.nav-toggle{display:none;flex-direction:column;gap:5px;background:none;border:0;cursor:pointer;padding:8px}
.nav-toggle span{width:22px;height:1.5px;background:var(--txt);border-radius:2px;transition:.25s var(--ease)}

/* ===================== Buttons / 按钮 ===================== */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:13px 26px;border-radius:980px;font-weight:500;font-size:14px;
  cursor:pointer;border:0;transition:transform .2s var(--ease),background .2s var(--ease),box-shadow .2s var(--ease),opacity .2s;
  letter-spacing:.01em;white-space:nowrap;
}
.btn-primary{background:var(--accent);color:#08080a}
.btn-primary:hover{background:#ffba3a;transform:translateY(-1px);box-shadow:0 8px 28px rgba(245,166,35,.28)}
.btn-outline{background:transparent;border:1px solid var(--line-strong);color:var(--txt)}
.btn-outline:hover{border-color:var(--txt);background:rgba(255,255,255,.04)}
.btn-dark{background:var(--txt);color:#08080a}
.btn-dark:hover{background:#fff;transform:translateY(-1px)}
.btn-lg{padding:16px 34px;font-size:15px}
.btn-block{display:flex;width:100%}

/* Buy on Amazon 专属按钮 */
.btn-buy{background:var(--buy);color:#08080a;font-weight:600}
.btn-buy:hover{background:#ffba3a;transform:translateY(-1px);box-shadow:0 10px 30px rgba(245,166,35,.32)}
.btn-buy svg{width:16px;height:16px}

/* ===================== Hero ===================== */
.hero{
  position:relative;
  padding:120px 0 100px;
  background:
    radial-gradient(900px 600px at 78% -10%, rgba(245,166,35,.18), transparent 60%),
    radial-gradient(700px 500px at 10% 120%, rgba(255,122,24,.10), transparent 60%),
    var(--bg);
  border-bottom:1px solid var(--line);
  overflow:hidden;
}
.hero-inner{position:relative;max-width:760px;margin:0 auto;text-align:center}
.hero .eyebrow{
  display:inline-block;font-size:12px;letter-spacing:.32em;text-transform:uppercase;
  color:var(--accent);font-weight:600;margin-bottom:22px;
}
.hero h1{
  font-size:clamp(40px,6vw,68px);line-height:1.04;font-weight:600;
  letter-spacing:-.035em;margin-bottom:24px;
}
.hero h1 em{font-style:normal;color:var(--accent)}
.hero p{font-size:20px;color:var(--txt-2);line-height:1.5;margin-bottom:38px;max-width:600px;margin-left:auto;margin-right:auto}
.hero-cta{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}
.hero-scroll{margin-top:64px;color:var(--txt-3);font-size:12px;letter-spacing:.1em;display:flex;flex-direction:column;align-items:center;gap:8px}
.hero-scroll .dot{width:3px;height:24px;background:linear-gradient(var(--accent),transparent);border-radius:2px;animation:scrolldot 1.8s var(--ease) infinite}
@keyframes scrolldot{0%{opacity:0;transform:translateY(-8px)}50%{opacity:1}100%{opacity:0;transform:translateY(8px)}}

/* ===================== Section 通用 ===================== */
.section{padding:96px 0}
.section.alt{background:var(--bg-2)}
.section-head{max-width:680px;margin:0 auto 56px;text-align:center}
.section-head .eyebrow{display:inline-block;font-size:12px;letter-spacing:.28em;text-transform:uppercase;color:var(--accent);font-weight:600;margin-bottom:14px}
.section-head h2{font-size:clamp(30px,4vw,44px);font-weight:600;letter-spacing:-.025em;line-height:1.1}
.section-head p{color:var(--txt-2);margin-top:16px;font-size:18px;line-height:1.5}

/* ===================== 分类卡片 / Category ===================== */
.cat-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.cat-card{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius-lg);
  padding:44px 30px;text-align:center;transition:all .3s var(--ease);position:relative;overflow:hidden;
}
.cat-card::before{content:"";position:absolute;inset:0;background:radial-gradient(400px 200px at 50% 0,var(--accent-soft),transparent 70%);opacity:0;transition:opacity .3s var(--ease)}
.cat-card:hover{border-color:var(--line-strong);transform:translateY(-4px);background:var(--card-2)}
.cat-card:hover::before{opacity:1}
.cat-card .icon{font-size:42px;margin-bottom:18px;position:relative}
.cat-card h3{font-size:21px;font-weight:600;letter-spacing:-.01em;margin-bottom:8px;position:relative}
.cat-card p{color:var(--txt-2);font-size:14px;line-height:1.5;margin-bottom:22px;position:relative}
.cat-card .lnk{font-size:13px;color:var(--accent);font-weight:500;position:relative;display:inline-flex;align-items:center;gap:6px}
.cat-card .lnk .arr{transition:transform .2s var(--ease)}
.cat-card:hover .lnk .arr{transform:translateX(4px)}

/* ===================== 产品网格 / Product grid ===================== */
.product-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.product-card{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  overflow:hidden;transition:all .3s var(--ease);display:flex;flex-direction:column;
}
.product-card:hover{transform:translateY(-4px);border-color:var(--line-strong);box-shadow:0 16px 40px rgba(0,0,0,.4)}
.product-card .thumb{position:relative;aspect-ratio:4/3;overflow:hidden;background:#000}
.product-card .thumb img{width:100%;height:100%;object-fit:contain;transition:transform .5s var(--ease);padding:8px}
.product-card:hover .thumb img{transform:scale(1.03)}
.product-card .badge{position:absolute;top:14px;left:14px;background:var(--accent);color:#08080a;font-size:10px;font-weight:700;padding:4px 10px;border-radius:980px;letter-spacing:.06em;text-transform:uppercase}
.product-card .body{padding:20px 22px 24px;flex:1;display:flex;flex-direction:column}
.product-card .cat{font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:var(--accent);font-weight:600;margin-bottom:8px}
.product-card h3{font-size:17px;font-weight:600;letter-spacing:-.01em;line-height:1.3;margin-bottom:8px}
.product-card .desc{font-size:13px;color:var(--txt-2);line-height:1.5;flex:1;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;margin-bottom:18px}
.product-card .foot{display:flex;align-items:center;justify-content:space-between}
.product-card .price{font-size:20px;font-weight:600;letter-spacing:-.01em}
.product-card .more{font-size:13px;color:var(--txt-2);font-weight:500;display:inline-flex;align-items:center;gap:5px}
.product-card:hover .more{color:var(--accent)}

/* ===================== 产品详情 / Product detail ===================== */
.breadcrumb{padding:28px 0 0;color:var(--txt-3);font-size:13px;display:flex;gap:8px;align-items:center;flex-wrap:wrap}
.breadcrumb a:hover{color:var(--txt)}
.breadcrumb span{color:var(--txt-3)}
.breadcrumb strong{color:var(--txt-2);font-weight:500}

.detail{display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:start}
.gallery{position:sticky;top:80px}
.gallery .main-img{
  width:100%;aspect-ratio:1/1;border-radius:var(--radius-lg);overflow:hidden;
  background:linear-gradient(135deg,#1a1a1e,#101012);border:1px solid var(--line);
}
.gallery .main-img img{width:100%;height:100%;object-fit:cover}
.gallery .thumbs{display:flex;gap:10px;margin-top:14px}
.gallery .thumbs button{
  width:72px;height:72px;border-radius:var(--radius-sm);overflow:hidden;border:1px solid var(--line);
  background:var(--card);cursor:pointer;padding:0;transition:border-color .2s var(--ease)
}
.gallery .thumbs button:hover,.gallery .thumbs button.on{border-color:var(--accent)}
.gallery .thumbs img{width:100%;height:100%;object-fit:cover}

.info .cat{font-size:12px;letter-spacing:.18em;text-transform:uppercase;color:var(--accent);font-weight:600;margin-bottom:14px}
.info h1{font-size:clamp(30px,3.4vw,44px);font-weight:600;letter-spacing:-.03em;line-height:1.1;margin-bottom:10px}
.info .subtitle{font-size:19px;color:var(--txt-2);line-height:1.4;margin-bottom:22px}
.info .price{font-size:28px;font-weight:600;letter-spacing:-.02em;padding-bottom:24px;margin-bottom:24px;border-bottom:1px solid var(--line)}
.info .desc{color:var(--txt-2);font-size:16px;line-height:1.6;margin-bottom:28px}
.info .features{margin-bottom:32px}
.info .features h4{font-size:13px;letter-spacing:.1em;text-transform:uppercase;color:var(--txt-3);font-weight:600;margin-bottom:14px}
.info .features ul{display:flex;flex-direction:column;gap:12px}
.info .features li{display:flex;align-items:flex-start;gap:12px;font-size:15px;color:var(--txt);line-height:1.4}
.info .features li .check{flex:none;width:20px;height:20px;border-radius:50%;background:var(--accent-soft);color:var(--accent);display:grid;place-items:center;font-size:11px;font-weight:700;margin-top:1px}
.info .buy-row{display:flex;gap:12px;align-items:center;flex-wrap:wrap;margin-bottom:26px}
.info .meta{padding-top:24px;border-top:1px solid var(--line);color:var(--txt-3);font-size:14px;line-height:1.5}
.info .meta a{color:var(--accent)}

/* ===================== About ===================== */
.about-wrap{display:grid;grid-template-columns:1.1fr .9fr;gap:60px;align-items:center}
.about-wrap .eyebrow{display:inline-block;font-size:12px;letter-spacing:.3em;text-transform:uppercase;color:var(--accent);font-weight:600;margin-bottom:16px}
.about-wrap h2{font-size:clamp(28px,3.4vw,40px);font-weight:600;letter-spacing:-.03em;line-height:1.1;margin-bottom:22px}
.about-wrap p{color:var(--txt-2);margin-bottom:18px;font-size:17px;line-height:1.6}
.feature-list{margin-top:28px;display:flex;flex-direction:column;gap:16px}
.feature-list li{display:flex;align-items:flex-start;gap:12px;font-size:16px}
.feature-list .tick{flex:none;width:22px;height:22px;border-radius:50%;background:var(--accent);color:#08080a;display:grid;place-items:center;font-size:12px;font-weight:700}
.about-img{border-radius:var(--radius-lg);overflow:hidden;border:1px solid var(--line);aspect-ratio:3/2}
.about-img img{width:100%;height:100%;object-fit:cover}

/* 统计条 / Stats strip */
.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:64px;padding-top:48px;border-top:1px solid var(--line)}
.stats .num{font-size:clamp(36px,5vw,56px);font-weight:600;letter-spacing:-.03em;color:var(--accent)}
.stats .lbl{font-size:13px;color:var(--txt-3);letter-spacing:.06em;margin-top:6px}

/* ===================== Contact ===================== */
.contact-wrap{display:grid;grid-template-columns:.8fr 1.2fr;gap:56px;align-items:start}
.contact-info .eyebrow{display:inline-block;font-size:12px;letter-spacing:.3em;text-transform:uppercase;color:var(--accent);font-weight:600;margin-bottom:14px}
.contact-info h2{font-size:clamp(28px,3.4vw,40px);font-weight:600;letter-spacing:-.03em;line-height:1.1;margin-bottom:20px}
.contact-info p{color:var(--txt-2);font-size:16px;line-height:1.6;margin-bottom:16px}
.contact-info a{color:var(--accent)}
.form-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius-lg);padding:36px}
.form-grid{display:flex;flex-direction:column;gap:18px}
.form-row label{display:block;font-size:13px;color:var(--txt-2);margin-bottom:8px;font-weight:500;letter-spacing:.01em}
.form-row input,.form-row textarea,.form-row select{
  width:100%;background:var(--bg);border:1px solid var(--line-strong);border-radius:var(--radius-sm);
  padding:13px 15px;color:var(--txt);font-family:inherit;font-size:15px;transition:border-color .2s var(--ease)
}
.form-row input:focus,.form-row textarea:focus,.form-row select:focus{outline:none;border-color:var(--accent)}
.form-row textarea{min-height:120px;resize:vertical}
.form-row.req label .req{color:var(--accent)}
.alert{padding:14px 18px;border-radius:var(--radius-sm);font-size:14px;margin-bottom:18px}
.alert-ok{background:var(--accent-soft);color:var(--accent);border:1px solid rgba(245,166,35,.3)}
.alert-err{background:rgba(255,80,80,.1);color:#ff6b6b;border:1px solid rgba(255,80,80,.3)}

/* CTA 大区块 / Big CTA band */
.cta-band{
  text-align:center;padding:110px 24px;
  background:
    radial-gradient(700px 400px at 50% 0%,rgba(245,166,35,.16),transparent 65%),
    var(--bg-2);
  border-radius:0;
}
.cta-band h2{font-size:clamp(32px,4.4vw,52px);font-weight:600;letter-spacing:-.035em;line-height:1.08;margin-bottom:18px}
.cta-band p{color:var(--txt-2);font-size:19px;margin-bottom:34px;max-width:560px;margin-left:auto;margin-right:auto;line-height:1.5}

.empty{color:var(--txt-3);padding:60px 0;text-align:center;font-size:16px}
.site-main{min-height:60vh}

/* ===================== Footer ===================== */
.site-footer{background:var(--bg-2);border-top:1px solid var(--line);padding:64px 0 0}
.footer-inner{display:grid;grid-template-columns:1.6fr 1fr 1fr 1.2fr;gap:40px;padding-bottom:48px}
.footer-col .logo-mark{font-size:21px;font-weight:600;letter-spacing:.02em}
.footer-col p{color:var(--txt-3);font-size:14px;margin-top:14px;line-height:1.5;max-width:280px}
.footer-col h4{font-size:12px;letter-spacing:.16em;text-transform:uppercase;color:var(--txt-3);font-weight:600;margin-bottom:18px}
.footer-col a{display:block;font-size:14px;color:var(--txt-2);margin-bottom:10px}
.footer-col a:hover{color:var(--txt)}
.footer-bottom{border-top:1px solid var(--line);padding:22px 0;color:var(--txt-3);font-size:13px}

/* ===================== Responsive ===================== */
@media (max-width:980px){
  .cat-grid,.product-grid{grid-template-columns:repeat(2,1fr)}
  .detail{grid-template-columns:1fr;gap:36px}
  .gallery{position:static}
  .about-wrap,.contact-wrap{grid-template-columns:1fr;gap:36px}
  .stats{grid-template-columns:1fr;gap:32px}
  .footer-inner{grid-template-columns:1fr 1fr}
}
@media (max-width:680px){
  body{font-size:16px}
  .section{padding:64px 0}
  .hero{padding:80px 0 64px}
  .main-nav{display:none}
  .main-nav.open{display:flex;position:absolute;top:56px;left:0;right:0;flex-direction:column;background:rgba(8,8,10,.96);backdrop-filter:blur(20px);padding:20px 24px;border-bottom:1px solid var(--line);gap:18px;align-items:flex-start}
  .nav-toggle{display:flex}
  .cat-grid,.product-grid{grid-template-columns:1fr}
  .footer-inner{grid-template-columns:1fr;gap:32px}
  .hero-cta{flex-direction:column}
  .hero-cta .btn{width:100%}
  .info .buy-row .btn{flex:1}
  .form-card{padding:24px}
}