/* ============================================================
   ds-binance.com — Binance Official Landing Page Style
   ============================================================ */
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
:root{
  --gold:#f0b90b;--gold-hover:#d4a20a;--gold-light:rgba(240,185,11,.1);
  --dark:#1e2026;--text:#333;--text2:#707a8a;--text3:#adb1b8;
  --bg:#fff;--bg2:#f8f9fa;--bg3:#f0f1f3;
  --border:#eaecef;--border2:#dee1e6;
  --green:#0ecb81;--red:#f6465d;
  --footer-bg:#1e2026;
  --sans:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  --container:1200px;
}
html{scroll-behavior:smooth;scroll-padding-top:72px}
body{font-family:var(--sans);background:var(--bg);color:var(--text);line-height:1.6;-webkit-font-smoothing:antialiased}
a{color:var(--gold);text-decoration:none;transition:color .15s}
a:hover{color:var(--gold-hover)}
img{max-width:100%}
.container{max-width:var(--container);margin:0 auto;padding:0 20px}

/* ===== Buttons ===== */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:14px 32px;border-radius:8px;font-size:1rem;font-weight:600;cursor:pointer;transition:all .2s;border:none}
.btn--gold{background:var(--gold);color:var(--dark)}
.btn--gold:hover{background:var(--gold-hover);color:var(--dark);transform:translateY(-1px);box-shadow:0 4px 16px rgba(240,185,11,.3)}
.btn--outline{border:2px solid var(--gold);color:var(--gold);background:transparent}
.btn--outline:hover{background:var(--gold-light);color:var(--gold-hover)}
.btn--sm{padding:10px 20px;font-size:.9rem}

/* ===== Header ===== */
.hdr{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.96);backdrop-filter:blur(8px);border-bottom:1px solid var(--border);transition:box-shadow .2s}
.hdr--scrolled{box-shadow:0 2px 12px rgba(0,0,0,.06)}
.hdr__inner{display:flex;align-items:center;height:64px;gap:20px}
.hdr__brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:1.1rem;color:var(--dark)}
.hdr__brand svg{width:28px;height:28px}
.hdr__nav{display:flex;gap:24px;margin-left:auto}
.hdr__nav a{font-size:.9rem;color:var(--text2);font-weight:500;position:relative;transition:color .15s}
.hdr__nav a:hover{color:var(--dark)}
.hdr__nav a::after{content:'';position:absolute;bottom:-4px;left:0;width:0;height:2px;background:var(--gold);transition:width .2s}
.hdr__nav a:hover::after{width:100%}
.lang-switch{display:flex;gap:4px}
.lang-switch a{font-size:.78rem;padding:4px 8px;border-radius:4px;color:var(--text2);font-weight:600;border:1px solid transparent;transition:all .15s}
.lang-switch a:hover{color:var(--gold);border-color:var(--gold)}
.lang-switch a.active{background:var(--gold-light);color:var(--gold);border-color:rgba(240,185,11,.3)}
.hdr__cta{padding:8px 20px;background:var(--gold);color:var(--dark);border-radius:6px;font-size:.88rem;font-weight:600;white-space:nowrap;transition:all .2s}
.hdr__cta:hover{background:var(--gold-hover);color:var(--dark);box-shadow:0 2px 8px rgba(240,185,11,.3)}
.hdr__burger{display:none;background:none;border:none;color:var(--dark);cursor:pointer}
.hdr__burger svg{width:24px;height:24px}

/* Mobile overlay */
.mob{position:fixed;inset:0;background:rgba(255,255,255,.98);backdrop-filter:blur(12px);z-index:200;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:24px;opacity:0;pointer-events:none;transition:opacity .2s}
.mob--open{opacity:1;pointer-events:all}
.mob__close{position:absolute;top:16px;right:16px;background:none;border:none;cursor:pointer;color:var(--dark)}
.mob__close svg{width:28px;height:28px}
.mob a{font-size:1.2rem;color:var(--dark);font-weight:500}
.mob a:hover{color:var(--gold)}
.mob__lang{display:flex;gap:8px;margin-top:8px}
.mob__lang a{font-size:.85rem;padding:6px 12px;border-radius:4px;color:var(--text2)}
.mob__lang a.on{color:var(--gold);background:var(--gold-light)}

@media(max-width:768px){
  .hdr__nav,.lang-switch,.hdr__cta{display:none}
  .hdr__burger{display:block}
}

/* ===== Hero ===== */
.hero{padding:80px 0 60px;background:linear-gradient(180deg,#fff 0%,var(--bg2) 100%)}
.hero__inner{text-align:center;max-width:720px;margin:0 auto}
.hero__title{font-size:2.8rem;font-weight:800;line-height:1.2;color:var(--dark);margin-bottom:16px}
.hero__title span{color:var(--gold)}
.hero__desc{font-size:1.1rem;color:var(--text2);margin-bottom:36px;line-height:1.7}
.hero__btns{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}
@media(max-width:640px){
  .hero{padding:48px 0 36px}
  .hero__title{font-size:1.8rem}
  .hero__desc{font-size:.95rem}
  .hero__btns .btn{width:100%}
}

/* ===== Section title ===== */
.section-title{text-align:center;font-size:1.8rem;font-weight:700;color:var(--dark);margin-bottom:12px}
.section-desc{text-align:center;color:var(--text2);margin-bottom:40px;font-size:1rem}

/* ===== Market ticker ===== */
.market{padding:60px 0;background:var(--bg)}
.market__grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.market__card{background:var(--bg);border:1px solid var(--border);border-radius:12px;padding:24px;transition:all .2s}
.market__card:hover{border-color:var(--gold);box-shadow:0 4px 16px rgba(0,0,0,.06)}
.market__coin{display:flex;align-items:center;gap:10px;margin-bottom:12px}
.market__icon{width:36px;height:36px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:1.1rem;font-weight:700;color:#fff}
.market__icon--btc{background:#f7931a}
.market__icon--eth{background:#627eea}
.market__icon--bnb{background:#f0b90b;color:var(--dark)}
.market__icon--sol{background:#9945ff}
.market__name{font-weight:600;font-size:.95rem}
.market__pair{font-size:.78rem;color:var(--text2)}
.market__price{font-size:1.3rem;font-weight:700;margin-bottom:4px}
.market__change{font-size:.88rem;font-weight:600}
.market__change--up{color:var(--green)}
.market__change--down{color:var(--red)}
@media(max-width:768px){.market__grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:480px){.market__grid{grid-template-columns:1fr}}

/* ===== Features ===== */
.features{padding:60px 0;background:var(--bg2)}
.features__grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.features__card{background:var(--bg);border-radius:12px;padding:32px;text-align:center;transition:all .2s;border:1px solid var(--border)}
.features__card:hover{transform:translateY(-4px);box-shadow:0 8px 24px rgba(0,0,0,.06)}
.features__icon{width:56px;height:56px;border-radius:12px;display:flex;align-items:center;justify-content:center;margin:0 auto 16px;font-size:1.5rem}
.features__icon--security{background:rgba(240,71,66,.1);color:#f04742}
.features__icon--speed{background:rgba(240,185,11,.1);color:#f0b90b}
.features__icon--global{background:rgba(14,203,129,.1);color:#0ecb81}
.features__title{font-size:1.1rem;font-weight:600;margin-bottom:8px;color:var(--dark)}
.features__desc{font-size:.9rem;color:var(--text2);line-height:1.6}
@media(max-width:768px){.features__grid{grid-template-columns:1fr}}

/* ===== Guide links ===== */
.guide{padding:60px 0}
.guide__grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.guide__card{display:block;background:var(--bg);border:1px solid var(--border);border-radius:12px;padding:28px 24px;transition:all .2s;color:var(--text)}
.guide__card:hover{border-color:var(--gold);box-shadow:0 4px 16px rgba(0,0,0,.06);color:var(--dark)}
.guide__card-icon{font-size:2rem;margin-bottom:12px}
.guide__card-title{font-size:1rem;font-weight:600;margin-bottom:6px}
.guide__card-desc{font-size:.85rem;color:var(--text2);line-height:1.5}
@media(max-width:768px){.guide__grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:480px){.guide__grid{grid-template-columns:1fr}}

/* ===== Steps ===== */
.steps{padding:60px 0;background:var(--bg2)}
.steps__grid{display:grid;grid-template-columns:repeat(3,1fr);gap:32px;position:relative}
.steps__grid::before{content:'';position:absolute;top:32px;left:calc(16.67% + 24px);right:calc(16.67% + 24px);height:2px;background:var(--border)}
.step{text-align:center;position:relative}
.step__num{width:48px;height:48px;border-radius:50%;background:var(--gold);color:var(--dark);font-size:1.1rem;font-weight:700;display:flex;align-items:center;justify-content:center;margin:0 auto 16px;position:relative;z-index:1}
.step__title{font-size:1.05rem;font-weight:600;margin-bottom:8px;color:var(--dark)}
.step__desc{font-size:.88rem;color:var(--text2);line-height:1.6;max-width:280px;margin:0 auto}
.step__link{display:inline-block;margin-top:8px;font-size:.85rem;color:var(--gold);font-weight:500}
.step__link:hover{color:var(--gold-hover)}
@media(max-width:768px){
  .steps__grid{grid-template-columns:1fr;gap:24px}
  .steps__grid::before{display:none}
}

/* ===== FAQ ===== */
.faq{padding:60px 0}
.faq__list{max-width:800px;margin:0 auto}
.faq__item{border-bottom:1px solid var(--border)}
.faq__q{width:100%;display:flex;align-items:center;justify-content:space-between;padding:20px 0;background:none;border:none;color:var(--dark);font-size:1rem;font-weight:500;cursor:pointer;text-align:left;font-family:inherit;transition:color .15s;gap:16px}
.faq__q:hover{color:var(--gold)}
.faq__q svg{width:18px;height:18px;color:var(--text2);transition:transform .2s;flex-shrink:0}
.faq__item--open .faq__q svg{transform:rotate(180deg)}
.faq__a{display:none;padding:0 0 20px;font-size:.92rem;color:var(--text2);line-height:1.7}
.faq__item--open .faq__a{display:block}

/* ===== App download ===== */
.app{padding:60px 0;background:var(--bg2)}
.app__inner{display:flex;align-items:center;gap:48px;max-width:800px;margin:0 auto}
.app__content{flex:1}
.app__title{font-size:1.5rem;font-weight:700;margin-bottom:12px;color:var(--dark)}
.app__desc{font-size:.95rem;color:var(--text2);margin-bottom:24px;line-height:1.7}
.app__btns{display:flex;gap:12px;flex-wrap:wrap}
.app__list{margin-top:16px;list-style:none;padding:0}
.app__list li{padding:6px 0;font-size:.9rem;color:var(--text2)}
.app__list li::before{content:'✓';color:var(--green);margin-right:8px;font-weight:700}
@media(max-width:768px){
  .app__inner{flex-direction:column;text-align:center}
  .app__btns{justify-content:center}
}

/* ===== Footer ===== */
.ftr{background:var(--footer-bg);color:#fff;padding:48px 0 0}
.ftr__grid{display:grid;grid-template-columns:2fr repeat(3,1fr);gap:32px}
.ftr__brand{font-size:1.1rem;font-weight:700;margin-bottom:12px;display:flex;align-items:center;gap:8px}
.ftr__brand svg{width:24px;height:24px}
.ftr__desc{font-size:.85rem;color:var(--text3);line-height:1.6;max-width:300px}
.ftr__col h4{font-size:.88rem;font-weight:600;margin-bottom:14px;color:var(--gold)}
.ftr__col a{display:block;font-size:.85rem;color:var(--text3);margin-bottom:8px;transition:color .15s}
.ftr__col a:hover{color:#fff}
.ftr__bottom{margin-top:32px;padding:20px 0;border-top:1px solid rgba(255,255,255,.08);display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:12px}
.ftr__copy{font-size:.78rem;color:var(--text3)}
.ftr__risk{font-size:.75rem;color:var(--text3);line-height:1.5;margin-top:8px;max-width:800px}
@media(max-width:768px){
  .ftr__grid{grid-template-columns:1fr 1fr;gap:24px}
}
@media(max-width:480px){
  .ftr__grid{grid-template-columns:1fr}
}

/* ===== Page (subpages) ===== */
.page{padding:48px 0;min-height:60vh}
.page__title{font-size:1.8rem;font-weight:700;color:var(--dark);margin-bottom:24px;text-align:center}
.page__body{max-width:800px;margin:0 auto;line-height:1.8;color:var(--text)}
.page__body h2{font-size:1.3rem;font-weight:600;margin:32px 0 12px;color:var(--dark)}
.page__body p{margin-bottom:16px}
.page__body ul,.page__body ol{margin-bottom:16px;padding-left:24px}
.page__body li{margin-bottom:8px}
.page__body a{color:var(--gold);text-decoration:underline}
.page__body a:hover{color:var(--gold-hover)}
.page__body .highlight{background:var(--gold-light);border-left:3px solid var(--gold);padding:16px 20px;border-radius:0 8px 8px 0;margin:20px 0}

/* ===== 404 ===== */
.err{text-align:center;padding:120px 20px;min-height:60vh}
.err__code{font-size:6rem;font-weight:800;color:var(--gold)}
.err__title{font-size:1.4rem;margin:16px 0 8px;color:var(--dark)}
.err__desc{color:var(--text2);margin-bottom:24px}
.err__btns{display:flex;gap:12px;justify-content:center}

/* ===== Back to top ===== */
.back-top{position:fixed;bottom:24px;right:24px;width:40px;height:40px;border-radius:50%;background:var(--gold);color:var(--dark);border:none;cursor:pointer;display:none;align-items:center;justify-content:center;box-shadow:0 2px 8px rgba(0,0,0,.15);z-index:50;transition:transform .2s}
.back-top:hover{transform:translateY(-2px)}
.back-top svg{width:18px;height:18px}