/* Shared styles for the secondary i4Step pages (about, privacy, terms, contact).
   The landing page keeps its styles inline; this file only serves the sub-pages
   and mirrors its design tokens so the brand stays consistent. */

:root{
  --purple:#5b3fd0;
  --purple-2:#7254e8;
  --ink:#101326;
  --muted:#62677a;
  --soft:#f4f6ff;
  --line:#e7e9f4;
  --green:#4bcf91;
  --pink:#ef67a5;
  --orange:#ffb84a;
  --max:1180px;
  --doc:860px;
  --radius:28px;
  --shadow:0 18px 50px rgba(41,35,95,.12);
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color:var(--ink);
  background:#fff;
  line-height:1.6;
}
a{color:var(--purple);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%;display:block}
.container{width:min(calc(100% - 40px),var(--max));margin:auto}

/* Header */
.page-header{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.94);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.nav{height:82px;display:flex;align-items:center;justify-content:space-between;gap:20px}
.brand{display:flex;align-items:center;gap:11px;font-weight:800;color:var(--ink);text-decoration:none}
.brand:hover{text-decoration:none}
.brand-mark{
  width:45px;height:45px;border-radius:22%;display:block;flex:0 0 auto;
  box-shadow:0 8px 20px rgba(25,106,253,.28);
}
.brand-copy{line-height:1.05}
.brand-copy strong{display:block;font-size:21px;letter-spacing:-.5px}
.brand-copy small{display:block;color:var(--purple);font-size:11px;font-weight:700;margin-top:4px}
.nav-links{display:flex;gap:26px;font-size:14px;font-weight:650}
.nav-links a{color:var(--ink);opacity:.78;text-decoration:none}
.nav-links a:hover{opacity:1;color:var(--purple);text-decoration:none}
.nav-links a[aria-current="page"]{color:var(--purple);opacity:1}
.nav-actions{display:flex;align-items:center;gap:12px}

/* Language switch — lives in the header on every page (see i18n.js) */
.lang-switch{display:inline-flex;align-items:center;gap:2px;padding:3px;border:1px solid var(--line);border-radius:999px;background:#fff}
.lang-switch button{
  font:inherit;font-size:12px;font-weight:750;letter-spacing:.6px;line-height:1;
  color:var(--muted);background:none;border:0;border-radius:999px;padding:6px 10px;cursor:pointer;
}
.lang-switch button:hover{color:var(--purple)}
.lang-switch button[aria-pressed="true"]{background:var(--purple);color:#fff}

.nav-btn{
  display:inline-flex;align-items:center;justify-content:center;
  background:var(--purple);color:#fff;font-weight:750;border-radius:999px;
  padding:12px 22px;text-decoration:none;box-shadow:0 10px 22px rgba(91,63,208,.2);
  transition:.2s transform,.2s box-shadow;
}
.nav-btn:hover{transform:translateY(-2px);box-shadow:0 14px 28px rgba(91,63,208,.28);text-decoration:none;color:#fff}

/* Document layout */
.doc-hero{
  background:linear-gradient(160deg,#f2f5ff,#e8efff 60%,#f7f9ff);
  border-bottom:1px solid var(--line);
  padding:64px 0 52px;
}
.doc-hero .eyebrow{font-size:12px;text-transform:uppercase;letter-spacing:2.2px;color:var(--purple);font-weight:800;margin-bottom:12px}
.doc-hero h1{font-size:clamp(34px,4.4vw,54px);line-height:1.04;letter-spacing:-2px;margin:0 0 14px;font-weight:850}
.doc-hero p{color:var(--muted);font-size:17px;max-width:640px;margin:0}

.doc{width:min(calc(100% - 40px),var(--doc));margin:auto;padding:56px 0 80px}
.doc section+section{margin-top:38px}
.doc h2{font-size:26px;line-height:1.2;letter-spacing:-.7px;margin:0 0 12px}
.doc h3{font-size:17px;margin:24px 0 8px}
.doc p{margin:0 0 12px;color:#31364a}
.doc ul,.doc ol{margin:0 0 14px;padding-left:22px;color:#31364a}
.doc li{margin-bottom:7px}
.doc strong{color:var(--ink)}
.doc code{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.9em;background:var(--soft);border:1px solid var(--line);border-radius:6px;padding:1px 6px}
.doc .updated{display:inline-block;font-size:12px;font-weight:750;color:var(--purple);background:#efeaff;border-radius:999px;padding:5px 12px;margin-bottom:6px}
.doc .updated+section{margin-top:16px}

.callout{
  background:var(--soft);border:1px solid var(--line);border-left:4px solid var(--purple);
  border-radius:14px;padding:16px 20px;margin:18px 0;font-size:15px;color:#31364a;
}
.callout.warn{border-left-color:var(--orange);background:#fff8ec;border-color:#f6e3c4}

table{width:100%;border-collapse:collapse;margin:14px 0 22px;font-size:14.5px}
th,td{text-align:left;padding:11px 12px;border-bottom:1px solid var(--line);vertical-align:top}
th{background:#f8f9ff;font-size:12px;text-transform:uppercase;letter-spacing:1px;color:var(--muted)}
td:first-child{font-weight:700;width:34%}

/* Language handling.
   1. Whole sections that exist in both languages (the legal pages).
   2. Single strings swapped by i18n.js — hidden until it has run so the
      English source text never flashes before the Vietnamese swap. */
html[data-lang="en"] [data-lang-block="vi"],
html[data-lang="vi"] [data-lang-block="en"]{display:none}
html[data-lang="vi"]:not(.i18n-ready) [data-i18n],
html[data-lang="vi"]:not(.i18n-ready) [data-i18n-html]{visibility:hidden}

/* Contact bits */
.contact-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px;margin:24px 0 8px}
.contact-card{border:1px solid var(--line);border-radius:20px;padding:22px;background:#fff;box-shadow:0 10px 30px rgba(40,40,90,.05)}
.contact-card h3{margin:0 0 6px;font-size:16px}
.contact-card p{font-size:14px;color:var(--muted);margin:0 0 10px}
.contact-card a{font-weight:750;font-size:14px}
.badge-row{display:flex;gap:10px;flex-wrap:wrap;margin-top:20px}
.badge{padding:8px 14px;border-radius:999px;background:#fff;border:1px solid var(--line);font-size:12px;font-weight:700}

/* Footer */
footer{border-top:1px solid var(--line);padding:35px 0 45px;background:#fff}
.footer-grid{display:flex;justify-content:space-between;gap:30px;align-items:center}
.footer-links{display:flex;gap:24px;font-size:13px}
.footer-links a{color:var(--muted);text-decoration:none}
.footer-links a:hover{color:var(--purple);text-decoration:none}
.footer-links a[aria-current="page"]{color:var(--purple);font-weight:750}
.copyright{font-size:12px;color:#9296a5}

@media(max-width:900px){
  .nav-links{display:none}
  .nav-btn{display:none}
  .doc-hero{padding:44px 0 38px}
  .doc{padding:40px 0 60px}
  .contact-grid{grid-template-columns:1fr}
  .footer-grid{flex-direction:column;align-items:flex-start}
}
@media(max-width:520px){
  .container,.doc{width:min(calc(100% - 28px),100%)}
  .nav{height:72px}
  .nav-actions{gap:8px}
  .lang-switch button{padding:6px 8px}
  .brand-mark{width:40px;height:40px}
  .brand-copy strong{font-size:19px}
  .doc h2{font-size:22px}
  td:first-child{width:42%}
  .footer-links{flex-wrap:wrap;gap:15px}
}