/* PayGate site — one system for every page.
   Palette: neutral base + one deep teal accent + state colours. Nothing else.
   Type: Anek Bangla (display) / Noto Sans Bengali (body) / JetBrains Mono (code, TrxID, numbers).
   Motion: 180ms, one easing. Cards: outlined by default. */

:root {
  --bg: #ffffff;
  --bg-soft: #f6f7f7;
  --surface: #ffffff;
  --surface-2: #f2f4f4;
  --border: #e3e7e7;
  --border-strong: #c9cfcf;
  --text: #111518;
  --muted: #5c6567;
  --faint: #8a9395;
  --accent: #0f766e;
  --accent-hover: #0b5f58;
  --on-accent: #ffffff;
  --success: #067647;
  --danger: #b42318;
  --warning: #b54708;
  --code-bg: #0d1012;
  --code-text: #dfe5e5;
  --code-muted: #7d8a8c;
  --shadow-float: 0 12px 32px rgba(16, 24, 24, .10), 0 2px 6px rgba(16, 24, 24, .06);

  --f-display: "Anek Bangla", "Noto Sans Bengali", system-ui, sans-serif;
  --f-body: "Noto Sans Bengali", system-ui, -apple-system, "Segoe UI", sans-serif;
  --f-mono: "JetBrains Mono", "Noto Sans Bengali", ui-monospace, SFMono-Regular, Menlo, monospace;

  --r-card: 14px;
  --r-ctl: 10px;
  --ease: cubic-bezier(.2, .7, .2, 1);
  --dur: 180ms;
  --wrap: 1160px;
  --gutter: 20px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0a0b0c;
    --bg-soft: #0e1011;
    --surface: #111314;
    --surface-2: #171a1b;
    --border: #222628;
    --border-strong: #343a3c;
    --text: #eceeee;
    --muted: #9aa3a5;
    --faint: #6d7678;
    --accent: #2aa797;
    --accent-hover: #3bbaa9;
    --on-accent: #041210;
    --success: #47cd89;
    --danger: #f97066;
    --warning: #fdb022;
    --code-bg: #0d1012;
    --shadow-float: 0 12px 32px rgba(0, 0, 0, .5), 0 2px 6px rgba(0, 0, 0, .4);
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #0a0b0c;
  --bg-soft: #0e1011;
  --surface: #111314;
  --surface-2: #171a1b;
  --border: #222628;
  --border-strong: #343a3c;
  --text: #eceeee;
  --muted: #9aa3a5;
  --faint: #6d7678;
  --accent: #2aa797;
  --accent-hover: #3bbaa9;
  --on-accent: #041210;
  --success: #47cd89;
  --danger: #f97066;
  --warning: #fdb022;
  --code-bg: #0d1012;
  --shadow-float: 0 12px 32px rgba(0, 0, 0, .5), 0 2px 6px rgba(0, 0, 0, .4);
  color-scheme: dark;
}

@media (min-width: 768px) { :root { --gutter: 32px; } }

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 84px; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 400 16px/1.7 var(--f-body);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
p { margin: 0; }
h1, h2, h3, h4 { margin: 0; font-family: var(--f-display); font-weight: 600; letter-spacing: -.01em; }
code, kbd, .mono { font-family: var(--f-mono); }
:lang(bn) ol { list-style-type: bengali; }
::selection { background: var(--accent); color: var(--on-accent); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 6px; }

.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 var(--gutter); }
.ico { width: 20px; height: 20px; flex: none; }
.ico-sm { width: 16px; height: 16px; flex: none; }
.ico-lg { width: 24px; height: 24px; flex: none; }
.muted { color: var(--muted); }
.num { font-variant-numeric: tabular-nums; }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

/* ── buttons ── */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  height: 46px; padding: 0 20px; border-radius: var(--r-ctl);
  font: 600 15px/1 var(--f-body); cursor: pointer; white-space: nowrap;
  border: 1px solid transparent;
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}
.btn:active { transform: scale(.99); }
.btn-primary { background: var(--accent); color: var(--on-accent); }
.btn-primary:hover { background: var(--accent-hover); }
.btn-ghost { background: transparent; color: var(--text); border-color: var(--border-strong); }
.btn-ghost:hover { background: var(--surface-2); }
.btn-text { height: auto; padding: 0; background: none; color: var(--text); font-weight: 500; }
.btn-text:hover { color: var(--accent); }
.btn-sm { height: 38px; padding: 0 14px; font-size: 14px; }
.btn-block { width: 100%; }
.btn[disabled] { opacity: .55; cursor: not-allowed; }

.icon-btn {
  display: inline-flex; align-items: center; justify-content: center;
  width: 40px; height: 40px; border-radius: var(--r-ctl);
  border: 1px solid var(--border); background: var(--surface); color: var(--text); cursor: pointer;
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.icon-btn:hover { background: var(--surface-2); border-color: var(--border-strong); }

/* ── nav ── */
.nav {
  position: sticky; top: 0; z-index: 40;
  background: var(--bg);
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur) var(--ease);
}
.nav.is-scrolled { border-bottom-color: var(--border); }
.nav-in { display: flex; align-items: center; gap: 28px; height: 68px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font: 700 19px/1 var(--f-display); letter-spacing: -.02em; }
.brand-mark { width: 28px; height: 28px; }
.nav-links { display: none; gap: 26px; font-size: 15px; color: var(--muted); }
.nav-links a { transition: color var(--dur) var(--ease); }
.nav-links a:hover, .nav-links a[aria-current="page"] { color: var(--text); }
.nav-end { margin-left: auto; display: flex; align-items: center; gap: 10px; }
.nav-cta { display: none; }
.nav-login { font-size: 15px; color: var(--muted); padding: 0 6px; transition: color var(--dur) var(--ease); }
.nav-login:hover { color: var(--text); }
@media (min-width: 900px) {
  .nav-links { display: flex; }
  .nav-cta { display: inline-flex; }
  .nav-menu-btn { display: none; }
}
.theme-toggle .i-moon { display: none; }
:root[data-theme="dark"] .theme-toggle .i-sun { display: none; }
:root[data-theme="dark"] .theme-toggle .i-moon { display: block; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .theme-toggle .i-sun { display: none; }
  :root:not([data-theme="light"]) .theme-toggle .i-moon { display: block; }
}

.sheet {
  position: fixed; inset: 68px 0 auto 0; z-index: 39;
  background: var(--bg); border-bottom: 1px solid var(--border);
  padding: 8px var(--gutter) 20px; display: none;
}
.sheet.open { display: block; }
.sheet a { display: flex; align-items: center; justify-content: space-between; padding: 14px 0; border-bottom: 1px solid var(--border); font-size: 16px; }
.sheet .btn { margin-top: 16px; }

/* ── sections ── */
.section { padding: 88px 0; }
.section-soft { background: var(--bg-soft); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.eyebrow { font: 500 13px/1 var(--f-mono); color: var(--accent); letter-spacing: .02em; margin-bottom: 14px; }
.h2 { font-size: clamp(28px, 3.6vw, 40px); line-height: 1.18; }
.lead { font-size: 17px; color: var(--muted); max-width: 640px; }
@media (min-width: 768px) { .section { padding: 120px 0; } }

/* ── cards ── */
.card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--r-card); }

/* ── code ── */
.code {
  position: relative;
  background: var(--code-bg); color: var(--code-text);
  border-radius: var(--r-card); border: 1px solid #1d2224;
  font: 400 13.5px/1.75 var(--f-mono);
  overflow: hidden;
}
.code pre { margin: 0; padding: 18px 20px; overflow-x: auto; }
.code .c { color: var(--code-muted); }
.code .k { color: #7fd1c4; }
.code .s { color: #e6c98a; }
.code-head {
  display: flex; align-items: center; gap: 4px;
  padding: 0 8px 0 14px; height: 44px; border-bottom: 1px solid #1d2224;
}
.code-tab {
  background: none; border: 0; color: var(--code-muted); cursor: pointer;
  font: 500 12.5px/1 var(--f-mono); padding: 8px 10px; border-radius: 7px;
  transition: color var(--dur) var(--ease), background var(--dur) var(--ease);
}
.code-tab:hover { color: var(--code-text); }
.code-tab[aria-selected="true"] { color: var(--code-text); background: #1a1f21; }
.code-title { font: 500 12.5px/1 var(--f-mono); color: var(--code-muted); }
.copy-btn {
  margin-left: auto; display: inline-flex; align-items: center; gap: 6px;
  background: none; border: 0; color: var(--code-muted); cursor: pointer;
  font: 500 12px/1 var(--f-body); padding: 8px; border-radius: 7px;
}
.copy-btn:hover { color: var(--code-text); background: #1a1f21; }
.code-pane[hidden] { display: none; }

/* ── form fields (shared with checkout) ── */
.field { display: grid; gap: 8px; }
.field label { font-size: 14px; font-weight: 500; }
.input {
  width: 100%; height: 50px; padding: 0 14px;
  background: var(--surface); color: var(--text);
  border: 1px solid var(--border-strong); border-radius: var(--r-ctl);
  font: 400 16px/1 var(--f-body);
  transition: border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.input::placeholder { color: var(--faint); }
.input:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 22%, transparent); }
.input.mono { font-family: var(--f-mono); letter-spacing: .04em; }
.input[aria-invalid="true"] { border-color: var(--danger); }
.field-err { font-size: 13.5px; color: var(--danger); display: flex; gap: 6px; align-items: flex-start; }

/* ── footer ── */
.footer { border-top: 1px solid var(--border); padding: 48px 0 40px; font-size: 14.5px; color: var(--muted); }
.footer-in { display: grid; gap: 28px; }
.footer-cols { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px; }
.footer h4 { font: 600 13px/1 var(--f-body); color: var(--text); margin-bottom: 14px; }
.footer ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; }
.footer a:hover { color: var(--text); }
.footer-base { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px; padding-top: 24px; border-top: 1px solid var(--border); }
@media (min-width: 768px) {
  .footer-in { grid-template-columns: 1.3fr 2fr; }
  .footer-cols { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

/* ── toast ── */
.toast {
  position: fixed; left: 50%; bottom: 24px; z-index: 60;
  transform: translate(-50%, 12px); opacity: 0; pointer-events: none;
  display: inline-flex; align-items: center; gap: 10px;
  background: var(--surface); color: var(--text); border: 1px solid var(--border);
  border-radius: 12px; padding: 12px 16px; font-size: 14.5px; box-shadow: var(--shadow-float);
  transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }
.toast .ico { color: var(--success); }

/* ── shared legal / prose pages ── */
.prose { max-width: 720px; }
.prose h1 { font-size: clamp(32px, 4vw, 44px); line-height: 1.15; margin-bottom: 12px; }
.prose h2 { font-size: 22px; margin: 44px 0 12px; }
.prose p, .prose li { color: var(--muted); }
.prose p + p { margin-top: 12px; }
.prose ul { padding-left: 20px; display: grid; gap: 8px; margin: 12px 0 0; }
.prose strong { color: var(--text); font-weight: 600; }
.prose .date { font: 500 13px/1 var(--f-mono); color: var(--faint); }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition-duration: 0ms !important; animation-duration: 0ms !important; }
}