/* index.css — QuantumExchange (Binance-style, light/dark + clean nav + no-overflow) */


/* ===== Color System (Dark as default) ===== */
:root{
  /* core */
  --bg:#0b0f15;
  --bg-soft:#11161f;
  --card:#121824;
  --surface:#0f141d;           /* frequently used inner surface */
  --text:#e8edf3;
  --muted:#9aa4b2;
  --good:#19c37d;
  --bad:#ef4444;
  --accent:#f0b90b;
  --border:#1e2633;
}

/* Light theme overrides */
.theme-light{
  --bg:#ffffff;
  --bg-soft:#f6f7f9;
  --card:#ffffff;
  --surface:#ffffff;
  --text:#0b0f15;
  --muted:#596273;
  --good:#0CAF60;
  --bad:#d32f2f;
  --accent:#f0b90b;
  --border:#e5e7eb;
}

*{box-sizing:border-box}
html,body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  font-family:Inter,system-ui,Segoe UI,Roboto,Helvetica,Arial,sans-serif;
  overflow-x:hidden;
}
a{color:inherit;text-decoration:none}
img,svg{max-width:100%;height:auto}
.container{max-width:1200px;margin:0 auto;padding:0 20px}

/* ===== Top Nav ===== */
.nav{position:sticky;top:0;z-index:50;background:color-mix(in oklab, var(--bg) 92%, transparent);backdrop-filter:blur(10px);border-bottom:1px solid var(--border)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:64px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;min-width:0}
.logo{width:58px;height:58px;flex:0 0 58px}
.brand-text{letter-spacing:.3px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:220px}

/* Make menu look like text (not buttons) */
.menu{display:flex;gap:16px;align-items:center}
.nav-link{
  background:transparent;border:0;appearance:none;
  padding:10px 6px;color:color-mix(in oklab, var(--text) 80%, transparent);
  font-weight:600;cursor:pointer;border-radius:4px;
}
.nav-link:hover{color:var(--text)}
.has-caret::after{content:"▾";margin-left:6px;font-size:.8rem;color:color-mix(in oklab, var(--text) 70%, transparent)}
.nav-group{position:relative}
.dropdown{
  position:absolute;top:44px;left:0;min-width:180px;
  background:var(--bg-soft);border:1px solid var(--border);
  border-radius:10px;display:none;flex-direction:column;overflow:hidden
}
.dropdown a{padding:10px 12px;color:color-mix(in oklab, var(--text) 82%, transparent)}
.dropdown a:hover{background:var(--surface);color:var(--text)}

.actions{display:flex;align-items:center;gap:10px;flex:0 0 auto}
.btn{
  display:inline-flex;align-items:center;justify-content:center;
  border-radius:10px;padding:10px 14px;border:1px solid var(--border);
  background:transparent;color:var(--text);font-weight:700;cursor:pointer
}
.btn.ghost:hover{background:var(--surface)}
.btn.primary{background:var(--accent);border-color:var(--accent);color:#111}
.btn.primary:hover{filter:brightness(1.05)}
.hamburger{display:none;flex-direction:column;gap:4px;border:0;background:transparent;cursor:pointer}
.hamburger span{width:22px;height:2px;background:color-mix(in oklab, var(--text) 80%, transparent);display:block}

/* ===== Mobile Drawer ===== */
.drawer{position:fixed;inset:0 0 0 auto;width:320px;max-width:92vw;background:var(--bg-soft);
  border-left:1px solid var(--border);transform:translateX(100%);transition:transform .25s ease;z-index:60;display:flex;flex-direction:column}
.drawer.open{transform:translateX(0)}
.drawer-head{display:flex;align-items:center;justify-content:space-between;padding:16px;border-bottom:1px solid var(--border);gap:10px}
.drawer-actions{display:flex;gap:10px;flex:1}
.drawer-close{font-size:22px;background:transparent;border:0;color:var(--text);cursor:pointer}
.drawer-search{padding:12px 16px;border-bottom:1px solid var(--border)}
.drawer-search input{width:100%;padding:11px 12px;border-radius:10px;border:1px solid var(--border);background:var(--bg);color:var(--text)}
.drawer-list{padding:10px 8px;display:flex;flex-direction:column;gap:4px}
.ditem{padding:12px;border-radius:8px;color:color-mix(in oklab, var(--text) 85%, transparent)}
.ditem:hover{background:var(--card);color:var(--text)}
.dgroup{border-radius:8px;padding:4px 8px}
.dgroup summary{padding:10px;border-radius:8px;cursor:pointer;list-style:none}
.dgroup[open] summary{background:var(--card)}
.dgroup a{display:block;padding:10px 12px;margin:2px 0;border-radius:6px;color:color-mix(in oklab, var(--text) 85%, transparent)}
.dgroup a:hover{background:var(--bg);color:var(--text)}
.drawer-theme{display:flex;align-items:center;justify-content:space-between;padding:12px 16px;border-top:1px solid var(--border);margin-top:auto}
.theme-switch{display:flex;gap:8px}
.chip{border:1px solid var(--border);background:var(--bg);color:var(--text);border-radius:8px;padding:6px 10px;cursor:pointer}
.chip.active{outline:2px solid var(--accent);outline-offset:1px}

/* ===== Hero ===== */
.hero{padding:40px 0 20px;border-bottom:1px solid var(--border)}
.hero-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:24px;max-width:100%}
.hero-copy h1{font-size:46px;line-height:1.05;margin:0 0 16px}
.hero-copy h1 small{display:block;font-size:36px;opacity:.95}
.cta-row{margin-top:10px}
.signup-form{display:flex;gap:10px}
.signup-form input{flex:1;min-width:220px;border-radius:12px;border:1px solid var(--border);background:var(--surface);color:var(--text);padding:12px 12px}

/* ===== Markets Card ===== */
.markets-card{background:var(--bg-soft);border:1px solid var(--border);border-radius:16px;padding:12px;max-width:100%}
.mc-tabs{display:flex;gap:12px;padding:4px 8px}
.tab{border:0;background:transparent;color:color-mix(in oklab, var(--text) 80%, transparent);padding:8px 10px;border-radius:8px;cursor:pointer;font-weight:700}
.tab.active{background:var(--surface);color:var(--text)}
.mc-list{margin-top:10px}
.mc-row{display:grid;grid-template-columns:minmax(0,1fr) auto auto;align-items:center;padding:10px;border-radius:10px}
.mc-row:hover{background:var(--surface)}
.mc-coin{display:flex;align-items:center;gap:10px}
.mc-coin img{width:20px;height:20px}
.mc-coin span{color:var(--muted);font-size:.9rem;margin-left:4px}
.mc-price{font-weight:800}
.mc-change{font-weight:800}
.mc-change.up{color:var(--good)}
.mc-change.down{color:var(--bad)}
.view-all{display:block;text-align:center;color:color-mix(in oklab, var(--text) 80%, transparent);padding:10px}

/* ===== Promo (Phone + QR + News) ===== */
.promo{padding:30px 0;border-bottom:1px solid var(--border)}
.promo-grid{display:grid;grid-template-columns:1fr 1fr 1fr;gap:24px;max-width:100%}

/* phone preview */
.phone-card{background:var(--bg-soft);border:1px solid var(--border);border-radius:22px;padding:14px;position:relative;max-width:100%}
.phone-top{height:10px;width:120px;background:var(--bg);border-radius:0 0 10px 10px;margin:0 auto 10px}
.phone-screen{border:1px solid var(--border);border-radius:16px;background:var(--bg);padding:12px}
.watchlist-head{display:flex;justify-content:space-between;margin-bottom:8px}
.watchlist{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:8px}
.watchlist li{display:flex;justify-content:space-between;background:var(--surface);border:1px solid var(--border);border-radius:10px;padding:8px 10px}

/* qr + text */
.qr-card{background:var(--bg-soft);border:1px solid var(--border);border-radius:16px;padding:16px;display:grid;grid-template-columns:160px 1fr;gap:16px;align-items:center;max-width:100%}
.qr-box{width:160px;height:160px;border-radius:12px;border:1px dashed var(--border);background:repeating-linear-gradient(45deg,var(--bg),var(--bg) 8px,var(--surface) 8px,var(--surface) 16px)}
.qr-text h3{margin:0 0 6px}
.platforms{display:flex;gap:8px;margin-top:8px;flex-wrap:wrap}
.pill{border:1px solid var(--border);border-radius:999px;padding:6px 10px;color:color-mix(in oklab, var(--text) 85%, transparent)}

/* news */
.news-card{background:var(--bg-soft);border:1px solid var(--border);border-radius:16px;padding:16px;display:flex;flex-direction:column;max-width:100%}
.news-head{display:flex;align-items:center;justify-content:space-between;gap:10px;flex-wrap:wrap}
.news-head .view-all-sm{white-space:nowrap;flex-shrink:1;font-size:.95rem;color:color-mix(in oklab, var(--text) 80%, transparent)}
.news-list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:8px}
.news-list li{background:var(--surface);border:1px solid var(--border);border-radius:10px;padding:10px;word-break:break-word}
.news-app-cta{margin-top:auto;display:flex;justify-content:space-between;align-items:center;background:var(--surface);border:1px solid var(--border);border-radius:10px;padding:10px}
.btn.small{padding:8px 10px;border-radius:8px}

/* ===== FAQ ===== */
.faq{padding:40px 0;border-bottom:1px solid var(--border);max-width:100%}
.faq h2{text-align:center;margin:0 0 16px}
.faq-list{max-width:900px;margin:0 auto;display:flex;flex-direction:column;gap:8px}
.faq details{background:var(--bg-soft);border:1px solid var(--border);border-radius:12px;padding:10px}
.faq summary{cursor:pointer;list-style:none;font-weight:700}
.faq p{color:color-mix(in oklab, var(--text) 85%, transparent)}

/* ===== CTA ===== */
.cta{padding:40px 0;max-width:100%}
.cta-box{background:var(--bg-soft);border:1px solid var(--border);border-radius:16px;display:flex;align-items:center;justify-content:space-between;padding:20px}
.btn.big{padding:14px 18px;border-radius:12px}

/* ===== Footer ===== */
.footer{border-top:1px solid var(--border);max-width:100%}
.footer-grid{display:grid;grid-template-columns:1.2fr repeat(4,1fr);gap:24px;padding:28px 0;max-width:100%}
.footer-grid h4{margin:0 0 8px}
.footer-grid a{display:block;color:color-mix(in oklab, var(--text) 85%, transparent);margin:6px 0}
.footer-brand{gap:10px}
.footer-bottom{display:flex;justify-content:space-between;align-items:center;border-top:1px solid var(--border);padding:14px 0}
.theme-toggle{display:flex;gap:10px;align-items:center}
.switch{position:relative;display:inline-block;width:44px;height:24px}
.switch input{opacity:0;width:0;height:0}
.slider{position:absolute;cursor:pointer;inset:0;background:var(--surface);border:1px solid var(--border);border-radius:14px;transition:.2s}
.slider:before{position:absolute;content:"";height:18px;width:18px;left:3px;top:2px;background:color-mix(in oklab, var(--text) 85%, transparent);border-radius:50%;transition:.2s}
.switch input:checked + .slider{background:color-mix(in oklab, var(--accent) 30%, var(--surface))}
.switch input:checked + .slider:before{transform:translateX(20px)}

/* ===== Responsive ===== */
@media (max-width:1100px){
  .promo-grid{grid-template-columns:1fr 1fr}
  .footer-grid{grid-template-columns:repeat(3,1fr)}
}
@media (max-width:900px){
  .container{padding:0 14px;width:100%}
  .menu{display:none}
  .hamburger{display:flex}
  .actions{gap:8px}
  .btn{padding:8px 12px;border-radius:8px}
  .brand-text{max-width:140px}
  .hero-grid{grid-template-columns:1fr}
  .promo-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media (max-width:600px){
  .qr-card{grid-template-columns:1fr;gap:12px}
  .qr-box{width:140px;height:140px;margin:0 auto}
}
@media (max-width:520px){
  .nav-inner{height:60px}
  .brand-text{max-width:110px}
  .actions .btn{padding:7px 10px;font-size:.92rem}
  .actions{gap:6px}
  .hamburger{margin-left:4px}
  .hero{padding-top:24px}
  .hero-copy h1{font-size:34px}
  .hero-copy h1 small{font-size:26px}
  .signup-form{flex-direction:column}
  .signup-form input{min-width:0;width:100%}
  .markets-card{margin-top:6px}
  .container{padding-left:12px;padding-right:12px}
  .phone-card,.news-card,.markets-card{padding:12px}
  .news-head .view-all-sm{font-size:.9rem}
}
@media (max-width:400px){
  .container{padding-left:10px;padding-right:10px}
  .brand-text{display:none}
  .actions .btn{padding:7px 9px}
}

/* ===== Defensive overflow clamps ===== */
section,header,footer{overflow-x:clip}
.drawer:not(.open){
  transform:translateX(100%);
  visibility:hidden;
  pointer-events:none;
}