*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
    html{scroll-behavior:smooth;-webkit-tap-highlight-color:transparent}
    body{font-family:'Inter',system-ui,sans-serif;background:#0a0a0f;color:#fff;-webkit-font-smoothing:antialiased;overflow-x:hidden}
    img{display:block;max-width:100%}
    :root{
      --accent:#e63462;
      --accent-glow:rgba(230,52,98,.4);
      --orange:#ff6b35;
      --surface:rgba(255,255,255,.05);
      --surface2:rgba(255,255,255,.08);
      --muted:rgba(255,255,255,.5);
      --line:rgba(255,255,255,.07);
      --safe-b:env(safe-area-inset-bottom,0px);
      --safe-t:env(safe-area-inset-top,0px);
      --mx:min(1180px,100%);
    }
    .container{width:var(--mx);margin:0 auto;padding-left:max(1.25rem,env(safe-area-inset-left));padding-right:max(1.25rem,env(safe-area-inset-right))}

    /* NAV */
    nav{position:sticky;top:0;z-index:50;background:rgba(10,10,15,.88);backdrop-filter:blur(16px);border-bottom:1px solid var(--line)}
    .nav-inner{display:flex;align-items:center;justify-content:space-between;gap:.75rem;padding-top:calc(.625rem + var(--safe-t));padding-bottom:.625rem}
    .brand{display:flex;align-items:center;gap:.5rem;font-weight:800;font-size:1.125rem;color:#fff;letter-spacing:-.03em}
    .brand img{width:32px;height:32px;border-radius:8px;object-fit:cover;display:block}
    .brand b{color:var(--accent);font-weight:800}
    .age-badge{font-size:.625rem;font-weight:800;color:#fff;background:var(--orange);padding:.15rem .4rem;border-radius:4px;margin-left:.25rem;vertical-align:super}
    #headerApp{font-size:.8125rem;font-weight:700;color:#fff;background:var(--accent);padding:.5rem 1.125rem;border-radius:999px;text-decoration:none;min-height:44px;display:inline-flex;align-items:center;box-shadow:0 4px 20px var(--accent-glow);transition:filter .15s}
    #headerApp:hover{filter:brightness(1.1)}

    /* HERO */
    .hero{position:relative;overflow:hidden;padding-bottom:clamp(2.5rem,8vw,4rem)}
    .hero-bg{position:absolute;inset:0;z-index:0}
    .hero-bg img{width:100%;height:100%;object-fit:cover;object-position:center 30%}
    .hero-bg::after{content:'';position:absolute;inset:0;background:linear-gradient(180deg,rgba(10,10,15,.5) 0%,rgba(10,10,15,.94) 65%,#0a0a0f 100%)}
    .hero-content{position:relative;z-index:2;padding-top:clamp(2.5rem,9vw,4.5rem)}
    .hero-grid{display:grid;gap:2rem;align-items:end}
    @media(min-width:900px){.hero-grid{grid-template-columns:1.1fr 1fr;gap:3rem;align-items:center}}

    .hero-text .pill{display:inline-flex;align-items:center;gap:.375rem;font-size:.6875rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--accent);background:rgba(230,52,98,.12);border:1px solid rgba(230,52,98,.25);padding:.375rem .75rem;border-radius:999px;margin-bottom:1rem}
    .hero-text h1{font-size:clamp(1.75rem,5.5vw,2.75rem);font-weight:800;line-height:1.1;letter-spacing:-.04em;margin-bottom:.75rem}
    .hero-text .sub{font-size:clamp(.9375rem,2vw,1.0625rem);color:var(--muted);line-height:1.65;margin-bottom:1.5rem;max-width:38ch}
    .hero-text .btn-row{display:flex;flex-wrap:wrap;gap:.75rem;align-items:center}
    .btn-main{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;min-height:3.25rem;padding:0 1.5rem;font:inherit;font-size:.9375rem;font-weight:700;color:#fff;background:var(--accent);border:none;border-radius:.75rem;cursor:pointer;box-shadow:0 8px 32px var(--accent-glow);transition:transform .15s,filter .15s}
    .btn-main:hover{filter:brightness(1.08)}
    .btn-main:active:not(:disabled){transform:scale(.98)}
    .btn-main:disabled{opacity:.45;cursor:not-allowed;transform:none}
    .btn-main svg{flex-shrink:0}
    .btn-ghost{display:inline-flex;align-items:center;min-height:3.25rem;padding:0 1.25rem;font:inherit;font-size:.875rem;font-weight:600;color:#fff;background:var(--surface2);border:1px solid var(--line);border-radius:.75rem;cursor:pointer}
    .btn-ghost:hover{background:rgba(255,255,255,.12)}
    .fine{margin-top:1rem;font-size:.6875rem;color:rgba(255,255,255,.25)}

    /* 缩略图网格 */
    .thumb-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:.5rem;max-width:400px;margin:0 auto}
    @media(min-width:900px){.thumb-grid{margin:0;max-width:none}}
    .thumb{position:relative;border-radius:.75rem;overflow:hidden;aspect-ratio:9/14;box-shadow:0 12px 40px rgba(0,0,0,.4)}
    .thumb img{width:100%;height:100%;object-fit:cover}
    .thumb-play{position:absolute;inset:0;display:grid;place-items:center;background:rgba(0,0,0,.3)}
    .thumb-play svg{width:40px;height:40px;color:#fff;opacity:.9;filter:drop-shadow(0 2px 8px rgba(0,0,0,.5))}
    .thumb-tag{position:absolute;top:.5rem;left:.5rem;font-size:.625rem;font-weight:700;color:#fff;background:var(--accent);padding:.2rem .5rem;border-radius:4px}
    .thumb-dur{position:absolute;bottom:.5rem;right:.5rem;font-size:.625rem;font-weight:700;color:#fff;background:rgba(0,0,0,.7);padding:.15rem .4rem;border-radius:4px}

    /* TICKER */
    .ticker-wrap{background:rgba(255,255,255,.02);border-top:1px solid var(--line);border-bottom:1px solid var(--line);overflow:hidden;padding:.625rem 0}
    .marquee-track{display:flex;width:max-content;animation:slide 35s linear infinite;gap:1.5rem;align-items:center}
    @keyframes slide{to{transform:translateX(calc(-50% - .75rem))}}
    .marquee .ticker-item{font-size:.6875rem;font-weight:500;color:var(--muted);white-space:nowrap;letter-spacing:.03em}
    .marquee .ticker-sep{color:rgba(255,255,255,.12);font-size:.5rem}

    /* FEATURES */
    .features{padding:clamp(2.5rem,7vw,4.5rem) 0}
    .sec-label{font-size:.6875rem;font-weight:700;letter-spacing:.14em;text-transform:uppercase;color:var(--accent);margin-bottom:.5rem;text-align:center}
    .sec-title{font-size:clamp(1.25rem,3.5vw,1.625rem);font-weight:700;text-align:center;letter-spacing:-.03em;margin-bottom:.375rem}
    .sec-sub{font-size:.9375rem;color:var(--muted);text-align:center;margin-bottom:clamp(1.5rem,4vw,2.5rem);max-width:36rem;margin-left:auto;margin-right:auto}
    .feat-grid{display:grid;gap:.875rem;grid-template-columns:1fr}
    @media(min-width:640px){.feat-grid{grid-template-columns:repeat(3,1fr);gap:1rem}}
    .feat{background:var(--surface);border:1px solid var(--line);border-radius:1rem;overflow:hidden}
    .feat-img{aspect-ratio:3/2;overflow:hidden;position:relative}
    .feat-img img{width:100%;height:100%;object-fit:cover;transition:transform .5s ease}
    .feat:hover .feat-img img{transform:scale(1.05)}
    .feat-img .play-sm{position:absolute;inset:0;display:grid;place-items:center;background:rgba(0,0,0,.2)}
    .feat-img .play-sm svg{width:32px;height:32px;color:#fff;opacity:.8}
    .feat-body{padding:1rem 1.125rem 1.25rem}
    .feat-body h3{font-size:.9375rem;font-weight:700;margin-bottom:.25rem;letter-spacing:-.02em}
    .feat-body p{font-size:.8125rem;color:var(--muted);line-height:1.55}

    /* STEPS */
    .steps-sec{padding-bottom:clamp(2rem,5vw,3rem)}
    .steps{display:grid;gap:0;border:1px solid var(--line);border-radius:1rem;overflow:hidden;background:var(--surface)}
    @media(min-width:900px){.steps{grid-template-columns:repeat(3,1fr);border:none;gap:1rem;background:transparent}.step-item{border:1px solid var(--line)!important;border-radius:1rem!important}}
    .step-item{display:grid;grid-template-columns:2.75rem 1fr;gap:.875rem;padding:1.125rem 1rem;border-bottom:1px solid var(--line);align-items:start}
    .step-item:last-child{border-bottom:none}
    .step-n{font-size:.75rem;font-weight:800;color:var(--accent);padding-top:2px}
    .step-item h3{font-size:.9375rem;font-weight:600;margin-bottom:.25rem}
    .step-item p{font-size:.8125rem;color:var(--muted);line-height:1.5}

    /* CTA */
    .cta-band{padding:clamp(2.5rem,6vw,4rem) 0;text-align:center;background:linear-gradient(180deg,#0a0a0f 0%,#12121f 100%)}
    .cta-band h2{font-size:clamp(1.25rem,3.5vw,1.5rem);font-weight:700;margin-bottom:.5rem}
    .cta-band p{font-size:.9375rem;color:var(--muted);margin-bottom:1.25rem;max-width:32ch;margin-left:auto;margin-right:auto}
    .cta-band .btn-main{margin:0 auto;max-width:320px;width:100%}

    footer{padding:1.5rem 0 calc(5rem + var(--safe-b));text-align:center;font-size:.6875rem;color:rgba(255,255,255,.2)}
    footer a{color:rgba(255,255,255,.35)}

    /* DOCK */
    .dock{position:fixed;left:0;right:0;bottom:0;z-index:60;padding:.625rem max(1rem,env(safe-area-inset-left)) calc(.625rem + var(--safe-b)) max(1rem,env(safe-area-inset-right));background:rgba(10,10,15,.92);backdrop-filter:blur(16px);border-top:1px solid var(--line);box-shadow:0 -8px 32px rgba(0,0,0,.4)}
    .dock .inner{max-width:var(--mx);margin:0 auto;display:flex;gap:.75rem;align-items:center}
    .dock .btn-main{flex:1;max-width:480px;margin:0 auto;border-radius:.625rem}

    #home,#how{scroll-margin-top:5rem}

/* Link controls retain the original button appearance. */
#headerApp{font:inherit;font-size:.8125rem;font-weight:700;border:0;cursor:pointer}
a.btn-main{text-decoration:none}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .marquee-track{animation:none}
  .feat-img img,.btn-main{transition:none}
}

/* Static-only controls and chicasenvivo brand. */
.brand{min-width:0;white-space:nowrap}
.brand img{flex-shrink:0;object-fit:contain;border-radius:0}
#headerApp:disabled{opacity:.55;cursor:not-allowed;box-shadow:none}
#headerApp:disabled:hover{filter:none}
.btn-main:disabled:hover{filter:none}
.fine{color:rgba(255,255,255,.5);line-height:1.5}
.privacy-note{max-width:38rem;margin:.75rem auto 0;font-size:.75rem;line-height:1.6}
.privacy-note summary{cursor:pointer;color:rgba(255,255,255,.6)}
.privacy-note p{margin-top:.5rem;color:rgba(255,255,255,.5)}
.btn-ghost:focus-visible,.privacy-note summary:focus-visible{outline:2px solid var(--accent);outline-offset:4px}
@media(max-width:420px){
  .nav-inner{flex-wrap:wrap;gap:.5rem}
  .brand{font-size:1rem}
  #headerApp{min-height:36px;padding:.4rem .8rem}
}