/* =========================================================
   OofChanger — landing / exchange page
   Background: images/background.svg (see .scene below).
   To use your own photo, change the url() in .scene, e.g.
   url(../images/my-photo.jpg)
   ========================================================= */
:root{
  --navy-900:#071a4f;
  --navy-800:#0b2a73;
  --blue-600:#1458dc;
  --blue-500:#2a7bff;
  --blue-100:#e6efff;
  --yellow:#ffc928;
  --yellow-600:#f5b000;

  --ink:#0d1f4a;
  --muted:#6f7e9c;
  --line:#e2e9f5;
  --field:#ffffff;
  --card:rgba(244,248,255,.93);
  --tab-off:rgba(168,184,216,.20);
  --hover:#f2f6ff;
  --accent-text:#1b63e6;
  --card-shadow:0 30px 80px rgba(3,12,50,.45);
}
[data-theme="dark"]{
  --ink:#eaf1ff;
  --muted:#95a6cb;
  --line:rgba(255,255,255,.12);
  --field:#0f2254;
  --card:rgba(9,22,60,.86);
  --tab-off:rgba(255,255,255,.05);
  --hover:rgba(255,255,255,.06);
  --blue-100:rgba(42,123,255,.22);
  --accent-text:#6fb1ff;
  --card-shadow:0 30px 80px rgba(0,0,0,.6);
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:Inter,system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  color:#fff;min-height:100vh;background:#0a2a6b;
  -webkit-font-smoothing:antialiased;overflow-x:hidden;
}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
a{color:inherit;text-decoration:none}
input{font:inherit}
.ic{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;flex:none}
.ic.fill{fill:currentColor}

/* ---------- Background scene ---------- */
.scene{position:fixed;inset:0;z-index:-1;overflow:hidden;background:#0a2a6b url(../images/background.svg) center/cover no-repeat}
.scene::after{content:"";position:absolute;inset:0;background:rgba(4,10,40,0);transition:background .5s}
[data-theme="dark"] .scene::after{background:rgba(4,10,40,.52)}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}

/* ---------- Header ---------- */
.site-header{
  position:sticky;top:0;z-index:30;height:84px;
  background:linear-gradient(180deg,rgba(7,32,100,.97),rgba(10,44,122,.92));
  backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);
  border-bottom:1px solid rgba(255,255,255,.14);
}
.header-in{max-width:1480px;height:100%;margin:0 auto;padding:0 28px;display:flex;align-items:center;gap:24px}
.logo{display:flex;align-items:center;gap:10px;flex:none}
.logo img{display:block;width:64px;height:64px;filter:drop-shadow(0 4px 10px rgba(0,0,0,.35))}
.logo b{display:block;font:700 31px/1 Poppins,sans-serif;letter-spacing:-.3px}
.logo small{display:block;font-size:13.5px;margin-top:5px;color:#dbe7ff;font-weight:500;letter-spacing:.1px}

.nav{display:flex;align-items:center;gap:6px;margin:0 auto}
.nav a,.nav .more-btn{
  display:flex;align-items:center;gap:9px;height:44px;padding:0 20px;border-radius:999px;
  font-weight:600;font-size:16px;color:#d4e3ff;transition:.2s;white-space:nowrap
}
.nav a:hover,.nav .more-btn:hover{color:#fff;background:rgba(255,255,255,.1)}
.nav a.active{
  color:#fff;background:linear-gradient(180deg,#2f8bff,#1262ee);
  box-shadow:0 0 0 1px rgba(255,255,255,.25) inset,0 0 26px rgba(42,123,255,.75)
}
.nav .ic{width:19px;height:19px}
.more{position:relative}
.more-menu{
  position:absolute;top:calc(100% + 10px);left:50%;transform:translateX(-50%);min-width:180px;padding:8px;
  background:#0b2a73;border:1px solid rgba(255,255,255,.18);border-radius:16px;box-shadow:0 20px 40px rgba(0,0,0,.4);
  display:none
}
.more.open .more-menu{display:block}
.more-menu a{height:40px;border-radius:10px;font-size:15px;padding:0 14px;display:flex}

.actions{display:flex;align-items:center;gap:16px;flex:none}
.icon-btn{width:40px;height:40px;border-radius:50%;display:grid;place-items:center;color:#fff;transition:.2s}
.icon-btn:hover{background:rgba(255,255,255,.14)}
.icon-btn .ic{width:24px;height:24px}
.btn-login,.btn-register{height:46px;padding:0 34px;border-radius:999px;font-weight:700;font-size:16px;display:grid;place-items:center;transition:.2s}
.btn-login{border:1.5px solid rgba(255,255,255,.75);color:#fff}
.btn-login:hover{background:rgba(255,255,255,.14)}
.btn-register{background:linear-gradient(180deg,#ffd84a,#ffbd14);color:#12295f;box-shadow:0 6px 18px rgba(255,190,20,.35)}
.btn-register:hover{filter:brightness(1.06);transform:translateY(-1px)}
.menu-btn{display:none}

/* ---------- Hero ---------- */
.hero{position:relative;max-width:1536px;margin:0 auto;padding:30px 24px 44px;text-align:center}
.badge{
  display:inline-flex;align-items:center;gap:10px;height:36px;padding:0 24px;border-radius:999px;
  background:rgba(6,30,98,.72);border:1px solid rgba(255,255,255,.14);
  font-weight:600;font-size:16px;backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px)
}
.badge .ic{width:19px;height:19px;--check:#0b2a73}
h1{
  margin-top:16px;font:800 clamp(34px,4.1vw,50px)/1.12 Poppins,sans-serif;letter-spacing:-.6px;
  text-shadow:0 3px 20px rgba(3,14,60,.55)
}
h1 span{color:var(--yellow)}
.sub{margin-top:10px;font-size:clamp(15px,1.4vw,19px);font-weight:500;color:#f1f6ff;text-shadow:0 2px 12px rgba(3,14,60,.6)}

/* left features + right handwriting (wide screens only) */
.features{display:none}
.script{display:none}
@media (min-width:1480px){
  .features{
    display:flex;flex-direction:column;gap:12px;position:absolute;left:clamp(32px,3.9vw,60px);top:196px;width:264px;text-align:left
  }
  .feature{
    display:flex;align-items:center;gap:12px;padding:10px 12px;border-radius:20px;
    background:rgba(255,255,255,.08);backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px)
  }
  .feature i{
    width:52px;height:52px;border-radius:50%;flex:none;display:grid;place-items:center;
    background:radial-gradient(circle at 30% 25%,#1d56c9,#0a2d84);border:2px solid rgba(124,176,255,.65);
    box-shadow:0 6px 16px rgba(0,10,60,.4)
  }
  .feature i .ic{width:24px;height:24px;color:#fff}
  .feature b{display:block;font-size:16px;font-weight:700}
  .feature span{display:block;margin-top:2px;font-size:12.5px;color:#dbe7ff;white-space:nowrap}
  .script{
    display:block;position:absolute;right:clamp(24px,4.5vw,70px);top:92px;transform:rotate(-9deg);text-align:left;
    font:400 34px/1.12 "Kaushan Script",cursive;color:#fff;text-shadow:0 3px 16px rgba(60,20,0,.45)
  }
  .script svg{display:block;width:220px;height:22px;margin:2px 0 0 30px}
}

/* ---------- Exchange card ---------- */
.card{
  position:relative;width:min(800px,100%);margin:24px auto 0;text-align:left;color:var(--ink);
  background:var(--card);border:1px solid rgba(255,255,255,.55);border-radius:28px;
  box-shadow:var(--card-shadow);backdrop-filter:blur(18px);-webkit-backdrop-filter:blur(18px);
  padding:0 26px 20px;overflow:hidden
}
[data-theme="dark"] .card{border-color:rgba(255,255,255,.14)}
.tabs{display:flex;margin:0 -26px;border-bottom:1px solid var(--line)}
.tab{
  flex:1;height:62px;display:flex;align-items:center;justify-content:center;gap:12px;
  font:600 19px Poppins,sans-serif;color:var(--muted);background:var(--tab-off);
  border-bottom:3px solid transparent;margin-bottom:-1px;transition:.2s
}
.tab .ic{width:26px;height:26px}
.tab.active{color:var(--accent-text);background:transparent;border-bottom-color:var(--blue-500)}
.tab:not(.active):hover{color:var(--ink)}

.grid{display:grid;grid-template-columns:1fr 56px 1fr;column-gap:14px;margin-top:14px}
.panel{min-width:0}
.panel>label{display:block;font-weight:700;font-size:14.5px;margin:0 0 10px}
.panel>label.amt{margin-top:18px}

.select{background:var(--field);border:1px solid var(--line);border-radius:12px;overflow:hidden;box-shadow:0 4px 14px rgba(20,50,120,.07)}
.search{display:flex;align-items:center;gap:10px;height:40px;padding:0 14px;border-bottom:1px solid var(--line);color:var(--muted)}
.search input{flex:1;min-width:0;border:0;outline:0;background:transparent;color:var(--ink);font-size:13.5px}
.search input::placeholder{color:var(--muted)}
.search .ic{width:18px;height:18px}
.list{height:240px;overflow-y:auto;scrollbar-width:thin;scrollbar-color:#c4d0e8 transparent}
.list::-webkit-scrollbar{width:6px}
.list::-webkit-scrollbar-thumb{background:#c4d0e8;border-radius:6px}
.gw{
  width:100%;height:40px;display:flex;align-items:center;gap:12px;padding:0 14px;text-align:left;
  font-size:14.5px;color:var(--ink);border-bottom:1px solid var(--line);transition:background .15s
}
.gw:last-child{border-bottom:0}
.gw:hover{background:var(--hover)}
.gw[aria-selected="true"]{background:var(--blue-100);font-weight:600}
.gw em{margin-left:auto;font-style:normal;font-size:12px;color:var(--muted);letter-spacing:.2px}
.empty{height:100%;display:grid;place-items:center;font-size:13px;color:var(--muted)}

/* gateway icons — image files in images/gateways/ */
.gi{width:26px;height:26px;flex:none;display:block}

/* swap button */
.mid{position:relative;display:flex;justify-content:center}
.mid::before{content:"";position:absolute;top:2px;bottom:-4px;left:50%;width:1px;background:linear-gradient(var(--line),transparent)}
.swap{
  position:relative;margin-top:148px;width:52px;height:52px;border-radius:50%;display:grid;place-items:center;
  background:var(--field);border:1.5px solid #bcd3ff;color:var(--blue-500);
  box-shadow:0 8px 20px rgba(42,123,255,.22),0 0 0 6px rgba(42,123,255,.08);transition:.25s
}
.swap:hover{transform:scale(1.07);box-shadow:0 10px 24px rgba(42,123,255,.4),0 0 0 8px rgba(42,123,255,.1)}
.swap .ic{width:26px;height:26px;stroke-width:2.4;transition:transform .45s}
.swap.flip .ic{transform:rotate(180deg)}

/* amount fields */
.field{display:flex;height:44px;background:var(--field);border:1px solid var(--line);border-radius:11px;overflow:hidden;transition:.2s}
.field:focus-within{border-color:var(--blue-500);box-shadow:0 0 0 3px rgba(42,123,255,.18)}
.field.err{border-color:#e5484d;box-shadow:0 0 0 3px rgba(229,72,77,.16)}
.field input{flex:1;min-width:0;border:0;outline:0;background:transparent;padding:0 14px;font-size:15px;color:var(--ink)}
.field input::placeholder{color:var(--muted)}
.chip{min-width:54px;padding:0 10px;display:grid;place-items:center;background:#dce9ff;color:#1255d6;font-weight:800;font-size:14.5px}
[data-theme="dark"] .chip{background:rgba(42,123,255,.28);color:#9cc4ff}
.hint{margin-top:9px;font-size:12.5px;color:var(--accent-text);min-height:18px}
.hint .sep{margin:0 7px;color:var(--muted)}

/* confirm */
.confirm{
  display:flex;align-items:center;justify-content:center;gap:12px;margin:16px auto 0;
  width:min(432px,100%);height:54px;border-radius:999px;color:#fff;font-weight:700;font-size:17.5px;
  background:linear-gradient(180deg,#3190ff,#0f5ae0);
  box-shadow:0 12px 26px rgba(20,100,240,.48),inset 0 1px 0 rgba(255,255,255,.4);transition:.2s
}
.confirm:hover{transform:translateY(-1px);filter:brightness(1.06)}
.confirm .ic{width:22px;height:22px}
.confirm .ic:last-child{width:19px;height:19px;stroke-width:2.6}
.confirm.locked{background:linear-gradient(180deg,#3190ff,#0f5ae0)}
.confirm.shake{animation:shake .4s}
@keyframes shake{20%,60%{transform:translateX(-6px)}40%,80%{transform:translateX(6px)}}
.note{display:flex;align-items:center;justify-content:center;gap:9px;margin-top:12px;font-size:13px;color:var(--muted);text-align:center}
.note .ic{width:17px;height:17px;flex:none}
.note button{color:var(--accent-text);font-weight:700}
.note button:hover{text-decoration:underline}
.note.ok{color:#18a058}

/* ---------- Bottom bar ---------- */
.bottom{
  max-width:1436px;margin:26px auto 0;padding:16px 34px;border-radius:64px;
  display:grid;grid-template-columns:repeat(4,1fr);text-align:left;
  background:rgba(7,28,88,.62);border:1px solid rgba(255,255,255,.22);
  backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);box-shadow:0 14px 40px rgba(0,10,50,.35)
}
.bi{display:flex;align-items:center;gap:16px;padding:6px 22px;justify-content:center}
.bi+.bi{border-left:1px solid rgba(255,255,255,.14)}
.bi .ic{width:44px;height:44px;stroke-width:1.7}
.bi b{display:block;font-size:15.5px;font-weight:700;color:#6db4ff}
.bi span{display:block;margin-top:2px;font-size:12.5px;color:#eef4ff}

/* ---------- Terms dialog ---------- */
dialog{
  margin:auto;width:min(640px,calc(100% - 28px));border:0;border-radius:24px;padding:0;color:var(--ink);
  background:#f7faff;box-shadow:0 40px 100px rgba(0,0,0,.55)
}
[data-theme="dark"] dialog{background:#0c1d4d}
dialog::backdrop{background:rgba(3,10,40,.65);backdrop-filter:blur(4px)}
.d-head{display:flex;align-items:center;justify-content:space-between;padding:20px 24px;border-bottom:1px solid var(--line)}
.d-head h2{font:700 20px Poppins,sans-serif}
.d-body{max-height:min(54vh,420px);overflow-y:auto;padding:20px 24px;font-size:14px;line-height:1.7;color:var(--ink)}
.d-body h3{font:600 15px Poppins,sans-serif;margin:16px 0 4px;color:var(--accent-text)}
.d-body h3:first-child{margin-top:0}
.d-body .ph{font-size:12px;color:var(--muted);background:var(--blue-100);padding:8px 12px;border-radius:10px;margin-bottom:14px}
.d-foot{display:flex;align-items:center;gap:16px;padding:16px 24px;border-top:1px solid var(--line)}
.progress{flex:1;height:6px;border-radius:6px;background:var(--line);overflow:hidden}
.progress i{display:block;height:100%;width:0;background:linear-gradient(90deg,#2f8bff,#18a058);transition:width .15s}
.agree{height:44px;padding:0 24px;border-radius:999px;font-weight:700;color:#fff;background:linear-gradient(180deg,#3190ff,#0f5ae0);transition:.2s}
.agree:disabled{background:#b9c6df;color:#eef2fa;cursor:not-allowed}
[data-theme="dark"] .agree:disabled{background:#2b3c6b;color:#7e8fb8}

/* toast */
.toast{
  position:fixed;left:50%;bottom:28px;transform:translate(-50%,30px);opacity:0;pointer-events:none;z-index:60;
  background:#0b2a73;color:#fff;padding:12px 20px;border-radius:14px;font-size:14px;font-weight:500;
  border:1px solid rgba(255,255,255,.2);box-shadow:0 14px 40px rgba(0,0,0,.4);transition:.3s;max-width:calc(100% - 32px)
}
.toast.show{opacity:1;transform:translate(-50%,0)}

/* ---------- Responsive ---------- */
@media (max-width:1360px){
  .header-in{gap:14px}
  .logo img{display:block;width:56px;height:56px}
  .logo b{font-size:27px}
  .nav a,.nav .more-btn{padding:0 14px;font-size:15px}
  .btn-login,.btn-register{padding:0 22px}
}
@media (max-width:1180px){
  .menu-btn{display:grid}
  .nav{
    position:absolute;top:84px;left:0;right:0;margin:0;flex-direction:column;align-items:stretch;gap:4px;padding:14px 20px 18px;
    background:rgba(8,34,104,.98);border-bottom:1px solid rgba(255,255,255,.14);display:none
  }
  .site-header.nav-open .nav{display:flex}
  .nav a,.nav .more-btn{justify-content:flex-start;width:100%}
  .more-menu{position:static;transform:none;margin-top:6px;box-shadow:none}
  .actions{margin-left:auto}
}
@media (max-width:1020px){
  .bottom{grid-template-columns:repeat(2,1fr);row-gap:10px;border-radius:36px}
  .bi:nth-child(3){border-left:0}
}
@media (max-width:760px){
  .header-in{padding:0 16px;gap:10px}
  .logo img{display:block;width:50px;height:50px}
  .logo b{font-size:24px}
  .logo small{font-size:11px}
  .btn-login{display:none}
  .btn-register{height:40px;padding:0 20px;font-size:14.5px}
  .site-header,.site-header{height:76px}
  .nav{top:76px}
  .hero{padding:22px 14px 36px}
  .card{padding:0 16px 22px;border-radius:24px;margin-top:26px}
  .tabs{margin:0 -16px}
  .tab{font-size:16px;height:56px;gap:8px}
  .grid{grid-template-columns:1fr;row-gap:6px}
  .mid{height:64px;align-items:center}
  .mid::before{top:50%;bottom:auto;left:0;right:0;width:auto;height:1px;background:var(--line)}
  .swap{margin-top:0}
  .swap .ic{transform:rotate(90deg)}
  .swap.flip .ic{transform:rotate(270deg)}
  .panel>label.amt{margin-top:18px}
  .list{height:200px}
  .bottom{grid-template-columns:1fr;padding:14px 18px;border-radius:28px}
  .bi{justify-content:flex-start;padding:8px 6px}
  .bi+.bi{border-left:0;border-top:1px solid rgba(255,255,255,.12)}
  .note{font-size:12px;align-items:flex-start;text-align:left}
}
@media (max-width:480px){
  .header-in{padding:0 12px;gap:8px}
  .logo{gap:7px}
  .logo img{display:block;width:40px;height:40px}
  .logo b{font-size:20px}
  .logo small{font-size:9.5px;margin-top:3px}
  .actions{gap:4px}
  .icon-btn{width:36px;height:36px}
  .icon-btn .ic{width:22px;height:22px}
  .btn-register{height:36px;padding:0 14px;font-size:13px}
}