:root{
  --bg:#f6f7fb;--surface:#ffffff;--surface-2:#eef1f7;--text:#0f172a;--muted:#64748b;--border:#e2e8f0;
  --brand:#2563eb;--brand-2:#7c3aed;--brand-ink:#ffffff;--ok:#16a34a;--warn:#d97706;--danger:#dc2626;
  --shadow:0 1px 2px rgba(15,23,42,.06),0 8px 24px rgba(15,23,42,.06);--radius:14px;
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --bg:#0b1020;--surface:#121a2e;--surface-2:#1a2440;--text:#e5e9f5;--muted:#94a3b8;--border:#24304d;
    --brand:#3b82f6;--brand-2:#8b5cf6;--shadow:0 1px 2px rgba(0,0,0,.3),0 8px 24px rgba(0,0,0,.35);
  }
}
:root[data-theme="dark"]{
  --bg:#0b1020;--surface:#121a2e;--surface-2:#1a2440;--text:#e5e9f5;--muted:#94a3b8;--border:#24304d;
  --brand:#3b82f6;--brand-2:#8b5cf6;--shadow:0 1px 2px rgba(0,0,0,.3),0 8px 24px rgba(0,0,0,.35);
}
*{box-sizing:border-box}
html,body{margin:0}
body{background:var(--bg);color:var(--text);font-family:Inter,"Kantumruy Pro",system-ui,sans-serif;line-height:1.55;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
.wrap{max-width:1200px;margin:0 auto;padding:0 16px}

/* Header */
header{position:sticky;top:0;z-index:40;background:color-mix(in srgb,var(--bg) 85%,transparent);backdrop-filter:blur(10px);border-bottom:1px solid var(--border)}
.nav{display:flex;align-items:center;gap:16px;height:64px}
.logo{display:flex;align-items:center;gap:10px;font-weight:800;font-size:18px;letter-spacing:-.02em}
.logo-mark{width:34px;height:34px;border-radius:10px;background:linear-gradient(135deg,var(--brand),var(--brand-2));display:grid;place-items:center;color:#fff;font-size:15px}
.nav-links{display:flex;gap:4px;margin-left:12px}
.nav-links a{padding:8px 12px;border-radius:8px;color:var(--muted);font-weight:500;font-size:14px}
.nav-links a:hover{background:var(--surface-2);color:var(--text)}
.spacer{flex:1}
.ctrl{display:flex;gap:8px;align-items:center}
.sel{background:var(--surface);border:1px solid var(--border);border-radius:9px;padding:7px 10px;font-size:13px;cursor:pointer}
.btn{border:0;border-radius:10px;padding:10px 16px;font-weight:600;font-size:14px;cursor:pointer;display:inline-flex;align-items:center;gap:8px;justify-content:center;transition:transform .08s,opacity .15s}
.btn:active{transform:scale(.98)}
.btn-primary{background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#fff}
.btn-ghost{background:var(--surface);border:1px solid var(--border)}
.btn-sm{padding:7px 12px;font-size:13px}
.icon-btn{width:36px;height:36px;border-radius:9px;border:1px solid var(--border);background:var(--surface);cursor:pointer;display:grid;place-items:center}
.balance{display:none;align-items:center;gap:6px;padding:6px 10px;border-radius:9px;background:var(--surface-2);font-weight:600;font-size:13px}
.logged .balance{display:flex}
.logged .guest-only{display:none!important}
.user-only{display:none!important}
.logged .user-only{display:inline-flex!important}

/* Hero */
.hero{padding:72px 0 48px;text-align:center;position:relative;overflow:hidden}
.hero::before{content:"";position:absolute;inset:-200px -50% auto;height:500px;background:radial-gradient(ellipse at center,color-mix(in srgb,var(--brand) 22%,transparent),transparent 65%);z-index:-1}
.pill{display:inline-flex;gap:8px;align-items:center;padding:6px 12px;border:1px solid var(--border);background:var(--surface);border-radius:999px;font-size:13px;color:var(--muted)}
.dot{width:8px;height:8px;border-radius:50%;background:var(--ok);box-shadow:0 0 0 4px color-mix(in srgb,var(--ok) 20%,transparent)}
.hero h1{font-size:clamp(30px,5vw,54px);line-height:1.12;letter-spacing:-.03em;margin:20px auto 14px;max-width:820px}
.grad{background:linear-gradient(135deg,var(--brand),var(--brand-2));-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p{color:var(--muted);font-size:18px;max-width:640px;margin:0 auto 28px}
.hero-cta{display:flex;gap:10px;justify-content:center;flex-wrap:wrap}
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;max-width:820px;margin:44px auto 0}
.stat{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:16px}
.stat b{display:block;font-size:24px;letter-spacing:-.02em}
.stat span{color:var(--muted);font-size:13px}

/* Features */
.section{padding:48px 0}
.section h2{font-size:clamp(24px,3vw,32px);letter-spacing:-.02em;margin:0 0 6px}
.section .sub{color:var(--muted);margin:0 0 24px}
.features{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.feature{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:20px}
.feature .ic{width:40px;height:40px;border-radius:10px;display:grid;place-items:center;background:var(--surface-2);font-size:20px;margin-bottom:12px}
.feature h3{margin:0 0 4px;font-size:16px}
.feature p{margin:0;color:var(--muted);font-size:14px}

/* Services */
.toolbar{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:14px}
.search{flex:1;min-width:220px;position:relative}
.search input{width:100%;padding:12px 14px 12px 40px;border-radius:11px;border:1px solid var(--border);background:var(--surface);outline:none}
.search input:focus{border-color:var(--brand)}
.search svg{position:absolute;left:13px;top:50%;transform:translateY(-50%);color:var(--muted)}
.chips{display:flex;gap:8px;overflow-x:auto;padding-bottom:6px;margin-bottom:18px;scrollbar-width:thin}
.chip{white-space:nowrap;padding:7px 13px;border-radius:999px;border:1px solid var(--border);background:var(--surface);font-size:13px;cursor:pointer;color:var(--muted)}
.chip.active{background:var(--text);color:var(--bg);border-color:var(--text)}
.chip small{opacity:.7;margin-left:4px}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:14px}
.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:16px;display:flex;flex-direction:column;gap:10px;transition:border-color .15s,transform .15s,box-shadow .15s}
.card:hover{border-color:color-mix(in srgb,var(--brand) 50%,var(--border));transform:translateY(-2px);box-shadow:var(--shadow)}
.card-top{display:flex;gap:12px;align-items:center}
.thumb{width:46px;height:46px;border-radius:12px;display:grid;place-items:center;font-size:22px;flex:none}
.card h4{margin:0;font-size:14.5px;line-height:1.35}
.cat-label{font-size:12px;color:var(--muted)}
.meta{display:flex;gap:6px;flex-wrap:wrap}
.tag{font-size:11.5px;padding:3px 8px;border-radius:6px;background:var(--surface-2);color:var(--muted);display:inline-flex;gap:4px;align-items:center}
.tag.instant{background:color-mix(in srgb,var(--ok) 15%,transparent);color:var(--ok)}
.tag.api{background:color-mix(in srgb,var(--brand) 15%,transparent);color:var(--brand)}
.card-foot{display:flex;align-items:center;justify-content:space-between;margin-top:auto;padding-top:10px;border-top:1px dashed var(--border)}
.price{font-weight:800;font-size:18px;letter-spacing:-.02em}
.empty{text-align:center;color:var(--muted);padding:40px;display:none}
.more{display:flex;justify-content:center;margin-top:22px}

/* How it works */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;counter-reset:s}
.step{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:20px;position:relative}
.step::before{counter-increment:s;content:counter(s);width:30px;height:30px;border-radius:50%;background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#fff;display:grid;place-items:center;font-weight:700;font-size:14px;margin-bottom:10px}
.step h3{margin:0 0 4px;font-size:16px}
.step p{margin:0;color:var(--muted);font-size:14px}

.cta{background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#fff;border-radius:20px;padding:40px 28px;text-align:center}
.cta h2{color:#fff}
.cta p{opacity:.9;margin:0 0 20px}
.cta .btn{background:#fff;color:#1e293b}

/* Dashboard */
#dashboard{display:none}
.logged #dashboard{display:block}
.dash{display:grid;grid-template-columns:1fr 1fr 1fr;gap:14px;margin-bottom:16px}
.panel{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:18px}
.panel h3{margin:0 0 10px;font-size:15px}
.big{font-size:28px;font-weight:800;letter-spacing:-.02em}
table{width:100%;border-collapse:collapse;font-size:13.5px}
th,td{text-align:left;padding:10px 8px;border-bottom:1px solid var(--border);white-space:nowrap}
th{color:var(--muted);font-weight:600;font-size:12px;text-transform:uppercase;letter-spacing:.04em}
.tbl-wrap{overflow-x:auto}
.status{padding:3px 8px;border-radius:6px;font-size:12px;font-weight:600}
.st-pending{background:color-mix(in srgb,var(--warn) 18%,transparent);color:var(--warn)}
.st-done{background:color-mix(in srgb,var(--ok) 18%,transparent);color:var(--ok)}
.st-process{background:color-mix(in srgb,var(--brand) 18%,transparent);color:var(--brand)}

/* Footer */
footer{border-top:1px solid var(--border);margin-top:48px;padding:40px 0 24px;background:var(--surface)}
.foot{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:24px}
.foot h5{margin:0 0 10px;font-size:13px;text-transform:uppercase;letter-spacing:.06em;color:var(--muted)}
.foot a{display:block;padding:4px 0;font-size:14px}
.foot a:hover{color:var(--brand)}
.foot p{color:var(--muted);font-size:14px;max-width:320px}
.copy{border-top:1px solid var(--border);margin-top:28px;padding-top:18px;color:var(--muted);font-size:13px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px}

/* Modal */
.modal{position:fixed;inset:0;background:rgba(2,6,23,.55);display:none;align-items:center;justify-content:center;z-index:60;padding:16px}
.modal.open{display:flex}
.dialog{background:var(--surface);border:1px solid var(--border);border-radius:18px;width:100%;max-width:440px;padding:24px;box-shadow:var(--shadow);max-height:92vh;overflow:auto}
.dialog h3{margin:0 0 4px;font-size:20px}
.dialog .sub{color:var(--muted);font-size:14px;margin:0 0 16px}
.tabs{display:flex;background:var(--surface-2);border-radius:10px;padding:4px;margin-bottom:16px}
.tabs button{flex:1;border:0;background:transparent;padding:8px;border-radius:8px;cursor:pointer;font-weight:600;font-size:14px;color:var(--muted)}
.tabs button.active{background:var(--surface);color:var(--text);box-shadow:0 1px 3px rgba(0,0,0,.08)}
label{display:block;font-size:13px;font-weight:600;margin:12px 0 6px}
.input{width:100%;padding:11px 12px;border-radius:10px;border:1px solid var(--border);background:var(--bg);outline:none}
.input:focus{border-color:var(--brand)}
.hint{font-size:12px;color:var(--muted);margin-top:4px}
.row{display:flex;gap:10px}
.row>*{flex:1}
.summary{background:var(--surface-2);border-radius:12px;padding:12px 14px;margin:14px 0;font-size:14px}
.summary div{display:flex;justify-content:space-between;padding:3px 0}
.pay-opts{display:grid;grid-template-columns:repeat(2,1fr);gap:8px}
.pay{border:1px solid var(--border);border-radius:10px;padding:10px;cursor:pointer;font-size:13px;font-weight:600;text-align:center;background:var(--bg)}
.pay.active{border-color:var(--brand);box-shadow:0 0 0 3px color-mix(in srgb,var(--brand) 20%,transparent)}
.x{float:right;border:0;background:transparent;font-size:22px;cursor:pointer;color:var(--muted);line-height:1}

.toast{position:fixed;bottom:20px;left:50%;transform:translateX(-50%) translateY(100px);background:var(--text);color:var(--bg);padding:12px 18px;border-radius:12px;font-size:14px;font-weight:500;z-index:80;transition:transform .25s;max-width:calc(100% - 32px)}
.toast.show{transform:translateX(-50%) translateY(0)}

.cookie{position:fixed;bottom:16px;left:16px;right:16px;max-width:520px;background:var(--surface);border:1px solid var(--border);border-radius:14px;padding:16px;box-shadow:var(--shadow);z-index:50;display:none;font-size:14px}
.cookie.show{display:block}
.cookie .row{margin-top:12px}

@media (max-width:900px){
  .nav-links{display:none}
  .features{grid-template-columns:repeat(2,1fr)}
  .stats{grid-template-columns:repeat(2,1fr)}
  .steps,.dash{grid-template-columns:1fr}
  .foot{grid-template-columns:1fr 1fr}
}
@media (max-width:560px){
  .features{grid-template-columns:1fr}
  .ctrl .sel.cur{display:none}
  .hero{padding-top:48px}
  .foot{grid-template-columns:1fr}
}

/* ---- additions for live backend ---- */
.dialog.wide{max-width:640px}
.err{color:var(--danger);font-size:13px;margin-top:10px;min-height:18px}
.link{color:var(--brand);cursor:pointer;background:none;border:0;padding:0;font-size:13px}
.qrbox{display:flex;flex-direction:column;align-items:center;gap:10px;margin:14px 0;text-align:center}
.qrbox .qr{background:#fff;padding:12px;border-radius:12px}
.khqr-head{background:#e1232e;color:#fff;font-weight:800;padding:6px 18px;border-radius:10px 10px 0 0;width:220px;margin-bottom:-10px}
pre.result{background:var(--surface-2);padding:12px;border-radius:10px;white-space:pre-wrap;word-break:break-all;font-size:13px;margin:8px 0}
tr.click{cursor:pointer}
tr.click:hover td{background:var(--surface-2)}
.st-rejected{background:color-mix(in srgb,var(--danger) 18%,transparent);color:var(--danger)}
.st-paid{background:color-mix(in srgb,var(--ok) 18%,transparent);color:var(--ok)}
.st-expired{background:var(--surface-2);color:var(--muted)}
.mono{font-family:ui-monospace,Menlo,monospace;font-size:12.5px;word-break:break-all}
.sect{border-top:1px solid var(--border);padding-top:14px;margin-top:16px}
.sect:first-of-type{border-top:0;margin-top:0;padding-top:0}
.page{max-width:820px;margin:0 auto;padding:40px 16px}
.page h1{letter-spacing:-.02em}
.page h2{margin-top:28px;font-size:20px}
.page p,.page li{color:var(--muted)}
.page code,.page pre{background:var(--surface-2);border-radius:6px;padding:2px 6px;font-size:13px}
.page pre{padding:14px;overflow-x:auto}
.oos{opacity:.55}
.balance{border:0;cursor:pointer;color:inherit;font:inherit;font-weight:600;font-size:13px}
/* mobile overflow fixes */
.hero h1,.section h2{overflow-wrap:anywhere}
.nav{min-width:0}
@media (max-width:560px){
  .logo span:last-child{display:none}
  .ctrl{gap:6px}
  .ctrl .sel{padding:6px 4px;max-width:96px}
  .search{min-width:0;flex-basis:100%}
  .toolbar .sel{flex:1}
  .stat b{font-size:20px}
}
/* brand logo */
.logo-img{width:40px;height:40px;object-fit:contain;flex:none;filter:drop-shadow(0 2px 6px rgba(37,99,235,.35))}
.hero-logo{width:150px;height:150px;object-fit:contain;margin-bottom:14px;filter:drop-shadow(0 10px 30px rgba(37,99,235,.45));animation:float 5s ease-in-out infinite}
@keyframes float{50%{transform:translateY(-8px)}}
@media (prefers-reduced-motion:reduce){.hero-logo{animation:none}}
@media (max-width:560px){.hero-logo{width:110px;height:110px}}