/* =========================================================
   香色闺阁·永久安装教程页 · Apple 设计语言优化版
   复用已验证视觉系统（毛玻璃导航/负字距/渐变/弹簧微交互）
   新增：面包屑、商品头(媒体+信息)、信息条、7步教程卡、注意事项、相关推荐
   ========================================================= */

:root {
  --blue: #0a84ff; --violet: #7c5cff; --pink: #ff5c8a;
  --grad: linear-gradient(120deg, #7c5cff 0%, #0a84ff 50%, #ff5c8a 100%);
  --bg: #07070d; --bg-2: #0c0c16;
  --surface: rgba(255,255,255,0.045); --surface-2: rgba(255,255,255,0.07);
  --border: rgba(255,255,255,0.10); --border-strong: rgba(255,255,255,0.18);
  --text: #f5f5f7; --text-2: rgba(245,245,247,0.62); --text-3: rgba(245,245,247,0.40);
  --nav-bg: rgba(10,10,18,0.6); --shadow: 0 20px 50px -20px rgba(0,0,0,0.8);
  --glow-1: rgba(124,92,255,0.35); --glow-2: rgba(10,132,255,0.28);
  --warn: rgba(255,159,10,0.14); --warn-bd: rgba(255,159,10,0.4); --warn-tx: #ffd60a;
}
html.light {
  --bg: #f5f5f7; --bg-2: #ffffff;
  --surface: rgba(0,0,0,0.035); --surface-2: rgba(0,0,0,0.06);
  --border: rgba(0,0,0,0.10); --border-strong: rgba(0,0,0,0.16);
  --text: #1d1d1f; --text-2: rgba(29,29,31,0.60); --text-3: rgba(29,29,31,0.40);
  --nav-bg: rgba(245,245,247,0.65); --shadow: 0 20px 50px -24px rgba(0,0,0,0.28);
  --glow-1: rgba(124,92,255,0.22); --glow-2: rgba(10,132,255,0.18);
}

*,*::before,*::after{box-sizing:border-box;} *{margin:0;}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;}
body{font-family:-apple-system,BlinkMacSystemFont,"SF Pro Display","SF Pro Text","PingFang SC","Helvetica Neue","Microsoft YaHei",system-ui,sans-serif;background:var(--bg);color:var(--text);line-height:1.5;letter-spacing:-0.01em;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;overflow-x:hidden;transition:background .5s ease,color .5s ease;}
a{color:inherit;text-decoration:none;} ul,ol{list-style:none;padding:0;}
button{font:inherit;color:inherit;cursor:pointer;border:0;background:none;}
:focus-visible{outline:2px solid var(--blue);outline-offset:3px;border-radius:6px;}

.scroll-progress{position:fixed;top:0;left:0;height:3px;width:0%;background:var(--grad);z-index:100;box-shadow:0 0 12px rgba(124,92,255,.6);transition:width .1s linear;}

/* Nav */
.nav{position:fixed;top:0;left:0;right:0;z-index:90;background:transparent;transition:background .4s,border-color .4s,backdrop-filter .4s;border-bottom:1px solid transparent;}
.nav.scrolled{background:var(--nav-bg);-webkit-backdrop-filter:saturate(180%) blur(20px);backdrop-filter:saturate(180%) blur(20px);border-bottom:1px solid var(--border);}
.nav__inner{max-width:1180px;margin:0 auto;padding:12px 24px;display:flex;align-items:center;gap:16px;}
.brand{display:flex;align-items:center;gap:9px;font-weight:600;letter-spacing:-0.02em;white-space:nowrap;}
.brand__mark{color:var(--violet);display:grid;place-items:center;}
.brand__name{font-size:18px;} .brand__sub{color:var(--text-2);font-weight:500;font-size:15px;}
.nav__links{display:flex;gap:2px;margin-left:14px;}
.nav__links a{padding:8px 12px;border-radius:980px;font-size:14px;color:var(--text-2);transition:color .25s,background .25s;}
.nav__links a:hover{color:var(--text);background:var(--surface);}
.nav__actions{margin-left:auto;display:flex;align-items:center;gap:10px;}
.theme-toggle{width:38px;height:38px;border-radius:50%;display:grid;place-items:center;color:var(--text-2);border:1px solid var(--border);background:var(--surface);transition:transform .15s ease,color .25s,background .25s;}
.theme-toggle:hover{color:var(--text);transform:scale(1.06);} .theme-toggle:active{transform:scale(0.92);}
.icon-sun{display:none;} html:not(.light) .icon-moon{display:none;} html:not(.light) .icon-sun{display:block;}

/* Buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font-weight:500;letter-spacing:-0.01em;border-radius:980px;transition:transform .12s ease,background .25s ease,box-shadow .25s ease,filter .25s;will-change:transform;}
.btn:active{transform:scale(0.96);}
.btn--sm{padding:8px 16px;font-size:14px;} .btn--lg{padding:15px 30px;font-size:17px;}
.btn--primary{background:var(--grad);color:#fff;box-shadow:0 8px 24px -8px rgba(124,92,255,.7);}
.btn--primary:hover{box-shadow:0 12px 32px -8px rgba(124,92,255,.85);filter:brightness(1.05);}
.btn--ghost{background:var(--surface);color:var(--text);border:1px solid var(--border-strong);}
.btn--ghost:hover{background:var(--surface-2);}

/* Layout */
.section{max-width:1180px;margin:0 auto;padding:110px 24px;}
.section--alt{max-width:none;background:var(--bg-2);}
.section--alt>*{max-width:1180px;margin-left:auto;margin-right:auto;}
.section__head{text-align:center;max-width:680px;margin:0 auto 56px;}
.eyebrow{display:inline-block;font-size:13px;font-weight:600;letter-spacing:0.04em;text-transform:uppercase;color:var(--violet);margin-bottom:14px;}
.section__title{font-size:clamp(2rem,4.5vw,3.1rem);font-weight:700;line-height:1.08;letter-spacing:-0.03em;}
.section__lead{margin-top:16px;color:var(--text-2);font-size:18px;}
.grad{background:var(--grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;color:transparent;}

/* Hero / product header */
.hero{position:relative;padding:30px 24px 60px;overflow:hidden;}
.hero__glow{position:absolute;inset:-10% 0 auto 0;height:560px;margin:auto;width:min(820px,90vw);background:radial-gradient(closest-side,var(--glow-1),transparent 70%),radial-gradient(closest-side,var(--glow-2),transparent 70%);background-position:35% 35%,65% 60%;background-repeat:no-repeat;filter:blur(40px);opacity:.85;pointer-events:none;}
.hero__inner{position:relative;z-index:2;max-width:1180px;margin:0 auto;}
.crumb{display:flex;gap:8px;align-items:center;font-size:13px;color:var(--text-3);margin-bottom:28px;flex-wrap:wrap;}
.crumb a:hover{color:var(--text-2);} .crumb .cur{color:var(--text-2);}
.hero__grid{display:grid;grid-template-columns:0.9fr 1.1fr;gap:48px;align-items:center;}

/* media card */
.hero__media{} 
.media-card{position:relative;aspect-ratio:4/5;border-radius:26px;padding:28px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:14px;text-align:center;background:linear-gradient(160deg,rgba(124,92,255,.18),var(--surface));border:1px solid var(--border-strong);overflow:hidden;box-shadow:var(--shadow);}
.media-card__badge{position:absolute;top:18px;left:18px;font-size:12px;font-weight:600;padding:5px 12px;border-radius:980px;background:var(--grad);color:#fff;}
.media-card__logo{width:96px;height:96px;border-radius:26px;display:grid;place-items:center;font-size:44px;font-weight:700;color:#fff;background:linear-gradient(135deg,#ff5f9e,#e91e63);box-shadow:0 12px 30px -10px rgba(233,30,99,.6);}
.media-card__name{font-size:24px;font-weight:700;letter-spacing:-0.02em;}
.media-card__tag{font-size:14px;color:var(--text-2);}
.play{margin-top:8px;display:inline-flex;align-items:center;gap:9px;padding:11px 20px;border-radius:980px;background:var(--surface-2);border:1px solid var(--border-strong);color:var(--text);font-size:14px;font-weight:500;transition:transform .12s,background .25s;}
.play:hover{background:var(--surface);} .play:active{transform:scale(0.95);}
.play svg{color:var(--violet);}

/* info */
.eyebrow{} .hero__title{font-size:clamp(2.2rem,5vw,3.6rem);font-weight:700;line-height:1.06;letter-spacing:-0.035em;margin:10px 0 18px;}
.hero__sub{font-size:clamp(1rem,1.6vw,1.15rem);color:var(--text-2);max-width:520px;}
.pricebox{margin:28px 0 22px;padding:22px;border-radius:20px;background:var(--surface);border:1px solid var(--border);}
.pricebox__price{display:flex;align-items:baseline;gap:6px;margin-bottom:18px;}
.pricebox__price .cur{font-size:20px;font-weight:600;color:var(--text-2);}
.pricebox__price .amt{font-size:42px;font-weight:700;letter-spacing:-0.04em;}
.pricebox__price .per{font-size:14px;color:var(--text-2);}
.pricebox__acts{display:flex;gap:12px;flex-wrap:wrap;}
.chips{display:flex;flex-wrap:wrap;gap:10px 18px;color:var(--text-2);font-size:14px;}
.chips li{position:relative;} .chips li{color:var(--text);} .chips li::marker{content:"";}

/* Infobar */
.infobar{max-width:1180px;margin:0 auto;padding:0 24px;}
.infobar__grid{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--border);border:1px solid var(--border);border-radius:22px;overflow:hidden;}
.ib{background:var(--bg);padding:26px 22px;}
.ib__k{font-size:13px;color:var(--text-3);margin-bottom:8px;}
.ib__v{font-size:19px;font-weight:600;letter-spacing:-0.01em;}

/* Tutorial steps */
.steps--tutorial{display:grid;grid-template-columns:repeat(2,1fr);gap:20px;counter-reset:step;}
.tut{position:relative;padding:26px;border-radius:22px;background:var(--surface);border:1px solid var(--border);overflow:hidden;transition:transform .4s cubic-bezier(.2,.8,.2,1),background .3s,border-color .3s,box-shadow .4s;}
.tut:hover{transform:translateY(-5px);background:var(--surface-2);border-color:var(--border-strong);box-shadow:var(--shadow);}
.tut__no{width:40px;height:40px;border-radius:50%;display:grid;place-items:center;font-size:17px;font-weight:700;color:#fff;background:var(--grad);margin-bottom:14px;}
.tut__title{font-size:18px;font-weight:600;letter-spacing:-0.02em;margin-bottom:8px;display:flex;align-items:center;gap:9px;}
.tut__video{font-size:11px;font-weight:600;color:var(--violet);background:rgba(124,92,255,.14);padding:3px 9px;border-radius:980px;}
.tut__desc{color:var(--text-2);font-size:15px;line-height:1.6;}
.tut__thumb{margin-top:16px;height:120px;border-radius:14px;background:linear-gradient(135deg,rgba(124,92,255,.18),rgba(10,132,255,.1));border:1px solid var(--border);display:grid;place-items:center;color:var(--text-3);}
.tut__thumb svg{color:var(--violet);}

/* Features */
.features{display:grid;grid-template-columns:repeat(2,1fr);gap:20px;}
.feature{padding:30px 26px;border-radius:22px;background:var(--surface);border:1px solid var(--border);transition:transform .4s cubic-bezier(.2,.8,.2,1),background .3s,border-color .3s;}
.feature:hover{transform:translateY(-5px);background:var(--surface-2);border-color:var(--border-strong);}
.feature__icon{width:50px;height:50px;border-radius:14px;display:grid;place-items:center;color:#fff;background:var(--grad);margin-bottom:18px;}
.feature h3{font-size:19px;font-weight:600;letter-spacing:-0.02em;margin-bottom:8px;}
.feature p{color:var(--text-2);font-size:15px;}

/* Notes */
.notes{display:grid;grid-template-columns:repeat(2,1fr);gap:16px;max-width:980px;margin:0 auto;}
.note{display:flex;gap:14px;padding:22px;border-radius:18px;background:var(--surface);border:1px solid var(--border);}
.note--warn{background:var(--warn);border-color:var(--warn-bd);}
.note__ico{font-size:20px;line-height:1.4;flex-shrink:0;}
.note p{font-size:15px;color:var(--text-2);line-height:1.6;}
.note--warn p{color:var(--text);} .note b{color:var(--text);font-weight:600;}

/* FAQ */
.faq{max-width:820px;margin:0 auto;display:grid;gap:12px;}
.faq__item{border:1px solid var(--border);border-radius:18px;background:var(--surface);overflow:hidden;}
.faq__q{width:100%;text-align:left;padding:20px 24px;font-size:17px;font-weight:500;display:flex;align-items:center;justify-content:space-between;gap:16px;letter-spacing:-0.01em;}
.faq__plus{position:relative;width:18px;height:18px;flex-shrink:0;}
.faq__plus::before,.faq__plus::after{content:"";position:absolute;background:var(--violet);border-radius:2px;transition:transform .35s cubic-bezier(.2,.8,.2,1);}
.faq__plus::before{top:8px;left:0;width:18px;height:2px;} .faq__plus::after{top:0;left:8px;width:2px;height:18px;}
.faq__item.open .faq__plus::after{transform:scaleY(0);}
.faq__a{max-height:0;overflow:hidden;transition:max-height .4s cubic-bezier(.2,.8,.2,1);}
.faq__a p{padding:0 24px 22px;color:var(--text-2);font-size:15px;line-height:1.6;}

/* Related */
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;}
.card{position:relative;padding:24px;border-radius:22px;background:var(--surface);border:1px solid var(--border);overflow:hidden;display:flex;flex-direction:column;transition:transform .4s cubic-bezier(.2,.8,.2,1),border-color .3s,background .3s,box-shadow .4s;will-change:transform;}
.card::before{content:"";position:absolute;inset:0;border-radius:inherit;padding:1px;background:var(--grad);-webkit-mask:linear-gradient(#000 0 0) content-box,linear-gradient(#000 0 0);-webkit-mask-composite:xor;mask-composite:exclude;opacity:0;transition:opacity .35s;}
.card:hover{transform:translateY(-6px);background:var(--surface-2);box-shadow:var(--shadow);border-color:transparent;}
.card:hover::before{opacity:1;}
.card__top{display:flex;align-items:center;gap:14px;margin-bottom:16px;}
.card__logo{width:52px;height:52px;border-radius:14px;display:grid;place-items:center;font-weight:700;font-size:18px;color:#fff;flex-shrink:0;}
.card__name{font-size:18px;font-weight:600;letter-spacing:-0.02em;}
.card__desc{font-size:13px;color:var(--text-2);margin-top:2px;}
.card__foot{margin-top:auto;display:flex;align-items:flex-end;justify-content:space-between;gap:12px;}
.card__price{line-height:1;} .card__price .cur{font-size:15px;font-weight:600;vertical-align:super;color:var(--text-2);}
.card__price .amt{font-size:30px;font-weight:700;letter-spacing:-0.03em;} .card__price .per{font-size:13px;color:var(--text-2);margin-left:3px;}
.card__buy{padding:10px 18px;border-radius:980px;font-size:14px;font-weight:500;color:#fff;background:var(--grad);white-space:nowrap;transition:transform .12s,filter .25s;flex-shrink:0;}
.card__buy:hover{filter:brightness(1.08);} .card__buy:active{transform:scale(0.94);}

/* CTA */
.cta{position:relative;padding:120px 24px;text-align:center;overflow:hidden;}
.cta__glow{position:absolute;inset:0;margin:auto;width:min(800px,90vw);height:500px;background:radial-gradient(closest-side,var(--glow-1),transparent 70%);filter:blur(50px);opacity:.7;pointer-events:none;}
.cta__inner{position:relative;z-index:2;max-width:640px;margin:0 auto;}
.cta h2{font-size:clamp(2rem,5vw,3.4rem);font-weight:700;letter-spacing:-0.03em;line-height:1.1;}
.cta p{color:var(--text-2);font-size:18px;margin:16px 0 30px;}

/* Footer */
.footer{background:var(--bg-2);border-top:1px solid var(--border);}
.footer__inner{max-width:1180px;margin:0 auto;padding:60px 24px 40px;display:grid;grid-template-columns:1.4fr 2fr;gap:40px;}
.footer__brand .brand__name{font-size:18px;} .footer__brand p{color:var(--text-2);font-size:14px;margin-top:12px;max-width:260px;}
.footer__cols{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;}
.footer__cols h4{font-size:14px;font-weight:600;margin-bottom:14px;}
.footer__cols a{display:block;color:var(--text-2);font-size:14px;padding:5px 0;transition:color .2s;}
.footer__cols a:hover{color:var(--text);}
.footer__bar{max-width:1180px;margin:0 auto;padding:22px 24px;border-top:1px solid var(--border);display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px;color:var(--text-3);font-size:13px;}

/* Toast */
.toast{position:fixed;left:50%;bottom:32px;transform:translate(-50%,120%);background:var(--text);color:var(--bg);font-weight:500;font-size:15px;padding:14px 24px;border-radius:980px;z-index:200;box-shadow:var(--shadow);transition:transform .5s cubic-bezier(.2,.9,.2,1);max-width:90vw;}
.toast.show{transform:translate(-50%,0);}

/* Reveal */
[data-reveal]{opacity:0;transform:translateY(28px);transition:opacity .7s ease,transform .7s cubic-bezier(.2,.8,.2,1);}
[data-reveal].in-view{opacity:1;transform:none;}
.steps--tutorial [data-reveal],.features [data-reveal],.cards [data-reveal],.notes [data-reveal]{transition-delay:var(--rd,0s);}

/* Responsive */
@media (max-width:980px){
  .hero__grid{grid-template-columns:1fr;gap:32px;}
  .nav__links{display:none;}
  .footer__inner{grid-template-columns:1fr;}
}
@media (max-width:820px){
  .steps--tutorial,.features,.notes,.cards{grid-template-columns:1fr;}
  .infobar__grid{grid-template-columns:repeat(2,1fr);}
}
@media (max-width:640px){
  .section{padding:80px 18px;}
  .infobar__grid{grid-template-columns:1fr;}
  .pricebox__acts .btn{width:100%;}
  .btn--lg{width:100%;}
  .footer__cols{grid-template-columns:repeat(2,1fr);}
  .footer__bar{flex-direction:column;}
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce){
  *,*::before,*::after{animation-duration:.001ms!important;animation-iteration-count:1!important;transition-duration:.15s!important;}
  [data-reveal]{opacity:1;transform:none;}
  html{scroll-behavior:auto;}
}