/* ===== RESET & BASE ===== */
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:'Inter',system-ui,-apple-system,sans-serif;color:#0d0d0d;background:#fff;line-height:1.6;-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block}
a{text-decoration:none;color:inherit}
ul{list-style:none}

/* ===== UTILITIES ===== */
.container{max-width:1140px;margin:0 auto;padding:0 24px}
.section{padding:100px 0}
.section--dark{background:#0a0a0a;color:#f5f5f5}
.section--light{background:#f8f8f8}
.tag{display:inline-block;font-size:.75rem;font-weight:600;letter-spacing:.08em;text-transform:uppercase;padding:6px 14px;border-radius:100px;margin-bottom:20px}
.tag--blue{background:rgba(13,85,255,.08);color:#0D55FF}
.tag--white{background:rgba(255,255,255,.1);color:rgba(255,255,255,.7)}
.tag--dark{background:rgba(0,0,0,.06);color:#555}

/* ===== TYPOGRAPHY ===== */
h1,h2,h3,h4,h5{font-weight:700;line-height:1.15;letter-spacing:-.02em}
h1{font-size:clamp(2.5rem,5.5vw,4rem)}
h2{font-size:clamp(2rem,4vw,3rem)}
h3{font-size:clamp(1.3rem,2.5vw,1.6rem)}
h4{font-size:1.05rem}
.text-muted{color:#666}
.text-muted-light{color:rgba(255,255,255,.5)}
.text-center{text-align:center}
.highlight{color:#0D55FF}
.section--dark .highlight{color:#5B93FF}
.section__sub{font-size:1.05rem;color:#666;margin-top:12px;max-width:560px;margin-left:auto;margin-right:auto;line-height:1.7}

/* ===== BUTTONS ===== */
.btn{display:inline-flex;align-items:center;gap:8px;font-size:.95rem;font-weight:600;padding:14px 32px;border-radius:10px;border:none;cursor:pointer;transition:all .25s ease}
.btn--primary{background:#0D55FF;color:#fff}
.btn--primary:hover{background:#0a47d6;transform:translateY(-1px);box-shadow:0 8px 30px rgba(13,85,255,.25)}
.btn--outline{background:transparent;color:#fff;border:1.5px solid rgba(255,255,255,.25)}
.btn--outline:hover{border-color:#5B93FF;color:#5B93FF}
.btn--outline-dark{background:transparent;color:#0d0d0d;border:1.5px solid #ddd}
.btn--outline-dark:hover{border-color:#0D55FF;color:#0D55FF}
.btn--sm{font-size:.85rem;padding:10px 22px;border-radius:8px}
.btn svg{width:18px;height:18px}

/* ===== NAV ===== */
.nav{position:fixed;top:0;left:0;width:100%;z-index:100;padding:16px 0;transition:all .3s}
.nav--scrolled{background:rgba(255,255,255,.95);backdrop-filter:blur(12px);box-shadow:0 1px 0 rgba(0,0,0,.06);padding:10px 0}
.nav__inner{display:flex;align-items:center;justify-content:space-between}
.nav__logo{font-size:1.5rem;font-weight:800;letter-spacing:-.03em;color:#f5f5f5}
.nav--scrolled .nav__logo{color:#0d0d0d}
.nav__logo span{color:#0D55FF}
.nav__links{display:flex;gap:32px}
.nav__links a{font-size:.88rem;font-weight:500;color:rgba(255,255,255,.7);transition:color .2s}
.nav--scrolled .nav__links a{color:#555}
.nav__links a:hover{color:#0D55FF}
.nav__cta{display:inline-flex}
.nav__hamburger{display:none;flex-direction:column;gap:5px;background:none;border:none;cursor:pointer;padding:4px}
.nav__hamburger span{width:22px;height:2px;background:#f5f5f5;border-radius:2px;transition:all .3s}
.nav--scrolled .nav__hamburger span{background:#0d0d0d}

/* ===== HERO (Dark) ===== */
.hero{min-height:80vh;display:flex;align-items:center;padding-top:100px;padding-bottom:60px}
.hero__content{max-width:800px;margin:0 auto}
.hero__body{font-size:1.15rem;color:rgba(255,255,255,.6);line-height:1.7;margin-top:16px;max-width:600px;margin-left:auto;margin-right:auto}
.hero__stats{display:flex;justify-content:center;gap:64px;margin-top:56px;padding-top:40px;border-top:1px solid rgba(255,255,255,.08)}
.hero__stat-item{text-align:center}
.hero__stat-item strong{display:block;font-size:1.6rem;font-weight:800;color:#5B93FF}
.hero__stat-item span{font-size:.78rem;color:rgba(255,255,255,.45);text-transform:uppercase;letter-spacing:.06em}

/* ===== TABLE OF CONTENTS ===== */
.toc-section{padding:48px 0}
.toc{max-width:720px;margin:0 auto;background:#f8f8f8;border-radius:16px;padding:32px 36px}
.toc__title{font-size:1.15rem;margin-bottom:20px;color:#0d0d0d}
.toc__nav{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.toc__link{display:flex;align-items:center;gap:12px;padding:10px 14px;border-radius:8px;font-size:.9rem;color:#333;transition:background .2s,color .2s}
.toc__link:hover{background:#e8e8e8;color:#0D55FF}
.toc__num{font-size:.75rem;font-weight:700;color:#0D55FF;min-width:24px}

/* ===== CHECKLIST ===== */
.checklist-section{padding:80px 0}
.checklist{max-width:800px;margin:0 auto}
.checklist__header{display:flex;align-items:flex-start;gap:24px;margin-bottom:40px}
.checklist__num{font-size:3rem;font-weight:800;color:rgba(13,85,255,.12);line-height:1;flex-shrink:0}
.checklist__header h2{margin-bottom:8px}
.checklist__desc{font-size:.95rem;color:#666;line-height:1.7}
.checklist__list{display:flex;flex-direction:column;gap:0}
.checklist__item{display:flex;gap:16px;padding:20px 0;border-bottom:1px solid #eee;align-items:flex-start}
.section--light .checklist__item{border-bottom-color:#ddd}
.checklist__item:last-child{border-bottom:none}
.checklist__box{width:24px;height:24px;min-width:24px;border:2px solid #0D55FF;border-radius:6px;margin-top:2px;position:relative;cursor:pointer;transition:all .2s}
.checklist__box::after{content:'';position:absolute;left:5px;top:1px;width:8px;height:13px;border:solid #fff;border-width:0 2.5px 2.5px 0;transform:rotate(45deg);opacity:0;transition:opacity .2s}
.checklist__item.checked .checklist__box{background:#0D55FF;border-color:#0D55FF}
.checklist__item.checked .checklist__box::after{opacity:1}
.checklist__item strong{display:block;font-size:1rem;font-weight:600;color:#0d0d0d;margin-bottom:4px}
.checklist__item p{font-size:.88rem;color:#666;line-height:1.6}

/* ===== CALLOUT ===== */
.callout__card{max-width:800px;margin:0 auto;text-align:center;padding:48px;background:#fff;border:1px solid #eee;border-radius:16px;box-shadow:0 8px 40px rgba(0,0,0,.04)}
.callout__card h2{margin-bottom:16px;font-size:clamp(1.6rem,3vw,2.2rem)}
.callout__body{font-size:1.05rem;color:#555;line-height:1.8;margin-bottom:32px;max-width:600px;margin-left:auto;margin-right:auto}
.callout__stats{display:flex;justify-content:center;gap:48px;margin-bottom:32px;padding:24px 0;border-top:1px solid #eee;border-bottom:1px solid #eee}
.callout__stat{text-align:center}
.callout__stat strong{display:block;font-size:2rem;font-weight:800;color:#0D55FF;line-height:1}
.callout__stat span{font-size:.78rem;color:#888;text-transform:uppercase;letter-spacing:.04em;margin-top:4px;display:block}

/* ===== FAQ ===== */
.faq__list{max-width:720px;margin:48px auto 0;display:flex;flex-direction:column;gap:12px}
.faq__item{border:1px solid #ddd;border-radius:12px;overflow:hidden;transition:border-color .3s;background:#fff}
.faq__item.open{border-color:rgba(13,85,255,.2)}
.faq__q{width:100%;text-align:left;background:none;border:none;padding:20px 24px;font-size:1rem;font-weight:600;color:#0d0d0d;cursor:pointer;display:flex;justify-content:space-between;align-items:center;gap:16px}
.faq__icon{font-size:1.3rem;color:#0D55FF;transition:transform .3s;flex-shrink:0}
.faq__item.open .faq__icon{transform:rotate(45deg)}
.faq__a{max-height:0;overflow:hidden;transition:max-height .35s ease}
.faq__item.open .faq__a{max-height:500px}
.faq__a p{padding:0 24px 20px;font-size:.92rem;color:#666;line-height:1.7}

/* ===== BOTTOM CTA ===== */
.cta-bottom h2{margin-bottom:16px}
.cta__actions{display:flex;justify-content:center;gap:16px;margin-top:32px;flex-wrap:wrap}

/* ===== FOOTER ===== */
.footer{background:#0a0a0a;color:#f5f5f5;padding:64px 0 32px}
.footer__inner{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:48px;margin-bottom:48px}
.footer__brand .nav__logo{color:#f5f5f5}
.footer__brand p{color:rgba(255,255,255,.4);font-size:.9rem;margin-top:12px;max-width:280px;line-height:1.7}
.footer__col h4{font-size:.8rem;text-transform:uppercase;letter-spacing:.08em;color:rgba(255,255,255,.3);margin-bottom:20px}
.footer__col a{display:block;font-size:.9rem;color:rgba(255,255,255,.6);margin-bottom:12px;transition:color .2s}
.footer__col a:hover{color:#5B93FF}
.footer__bottom{border-top:1px solid rgba(255,255,255,.08);padding-top:24px;display:flex;justify-content:space-between;align-items:center}
.footer__bottom p{font-size:.8rem;color:rgba(255,255,255,.3)}
.footer__bottom a{font-size:.8rem;color:rgba(255,255,255,.4);margin-left:24px}
.footer__bottom a:hover{color:#5B93FF}

/* ===== ANIMATIONS ===== */
.fade-up{opacity:0;transform:translateY(24px);transition:opacity .5s ease,transform .5s ease}
.fade-up.visible{opacity:1;transform:translateY(0)}
.hero__stat-item.fade-up:nth-child(2){transition-delay:.1s}
.hero__stat-item.fade-up:nth-child(3){transition-delay:.2s}

/* ===== RESPONSIVE ===== */
@media(max-width:1024px){
  .footer__inner{grid-template-columns:1fr 1fr}
  .callout__stats{gap:32px}
  .hero__stats{gap:40px}
}
@media(max-width:768px){
  .section{padding:72px 0}
  .checklist-section{padding:56px 0}
  .nav__links,.nav__cta{display:none}
  .nav__hamburger{display:flex}
  .nav__links.open{display:flex;flex-direction:column;position:absolute;top:100%;left:0;width:100%;background:#fff;padding:24px;gap:16px;box-shadow:0 8px 30px rgba(0,0,0,.08)}
  .nav__links.open a{color:#555}
  .hero{min-height:auto;padding:120px 0 60px}
  .hero__stats{flex-direction:column;gap:24px;align-items:center}
  .toc__nav{grid-template-columns:1fr}
  .checklist__header{flex-direction:column;gap:12px}
  .checklist__num{font-size:2rem}
  .callout__card{padding:32px 20px}
  .callout__stats{flex-direction:column;gap:20px}
  .cta__actions{flex-direction:column;align-items:center}
  .footer__inner{grid-template-columns:1fr}
  .footer__bottom{flex-direction:column;gap:16px;text-align:center}
}