/* ============================================================
   fi88 Guide — "Soft Aurora" design system
   Light, SOFT & rounded, friendly-modern. Lavender-white canvas,
   violet→pink gradients, soft colored shadows, large radii,
   Poppins (rounded geometric) display + Inter body.
   The 4th distinct axis — none of the siblings use gradients or
   soft rounded forms: good88168 (light/serif/airy), bento4d168
   (dark/grotesk), gdbet333168 (light/brutalist). Same class contract.
   ============================================================ */

:root{
  /* palette — aurora */
  --bg:#f7f6fd;           /* soft lavender-white canvas */
  --surface:#ffffff;
  --surface-2:#fbfaff;
  --ink:#211f3a;          /* soft deep indigo-charcoal */
  --ink-soft:#5c5a7e;
  --ink-faint:#8f8db0;
  --violet:#5b4be8;       /* primary */
  --violet-dk:#4636c4;
  --violet-tint:#eeeafe;  /* lavender wash */
  --pink:#ff7eb6;         /* gradient end / secondary */
  --pink-tint:#ffeef6;
  --mint:#2bd4a8;         /* success / check */
  --coral:#ff5d73;        /* warning */
  --coral-tint:#ffe9ec;
  --line:#e8e5f6;         /* soft hairline */
  --grad:linear-gradient(135deg,#6c4cf0 0%,#a85cf0 55%,#ff7eb6 100%);
  --grad-soft:linear-gradient(135deg,#6c4cf0,#ff7eb6);

  /* shape + soft depth */
  --radius:18px;
  --radius-sm:12px;
  --radius-pill:999px;
  --shadow:0 12px 34px rgba(91,75,232,.14), 0 2px 8px rgba(91,75,232,.06);
  --shadow-sm:0 6px 18px rgba(91,75,232,.10);
  --shadow-violet:0 14px 36px rgba(108,76,240,.28);

  /* scale */
  --maxw:1120px;
  --measure:720px;

  /* type */
  --font-head:'Poppins', system-ui, 'Segoe UI', sans-serif;
  --font-body:'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  --font-mono:'Inter', ui-monospace, monospace;
}

/* ---------- reset / base ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.72;
  color:var(--ink);
  background:var(--bg);
  background-image:
    radial-gradient(42% 46% at 92% -5%, rgba(255,126,182,.14) 0%, transparent 60%),
    radial-gradient(48% 52% at -5% 2%, rgba(108,76,240,.14) 0%, transparent 58%);
  background-attachment:fixed;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
img{max-width:100%;height:auto;display:block}
a{color:var(--violet);text-decoration:none;font-weight:500}
a:hover{color:var(--violet-dk);text-decoration:underline;text-underline-offset:2px}
strong{font-weight:600;color:var(--ink)}
hr{border:0;border-top:1px solid var(--line);margin:2.2rem 0}

/* ---------- layout ---------- */
.container{width:100%;max-width:var(--maxw);margin-inline:auto;padding-inline:20px}
.prose{max-width:var(--measure)}
main{display:block}
.section{padding-block:clamp(2.2rem,5vw,3.6rem)}

/* ---------- typography ---------- */
h1,h2,h3,h4{
  font-family:var(--font-head);
  font-weight:600;
  line-height:1.18;
  letter-spacing:-.015em;
  color:var(--ink);
  margin:0 0 .6em;
}
h1{font-size:clamp(2rem,4.6vw,3rem);font-weight:700;letter-spacing:-.025em}
h2{font-size:clamp(1.45rem,3vw,1.95rem);margin-top:2.1em}
h3{font-size:clamp(1.15rem,2vw,1.4rem);margin-top:1.7em}
h4{font-size:1.06rem;margin-top:1.4em}
.prose p{margin:0 0 1.15em}
.prose > :first-child{margin-top:0}
.lead{font-size:1.18rem;color:var(--ink-soft);line-height:1.64}

/* ---------- header ---------- */
.site-header{
  position:sticky;top:0;z-index:50;
  background:rgba(247,246,253,.82);
  backdrop-filter:saturate(1.4) blur(12px);
  border-bottom:1px solid var(--line);
}
.site-header .bar{display:flex;align-items:center;gap:1rem;height:66px}
.brand{display:flex;align-items:baseline;gap:.42rem;font-family:var(--font-head);
  font-weight:700;font-size:1.32rem;color:var(--ink);letter-spacing:-.02em;white-space:nowrap}
.brand:hover{text-decoration:none;color:var(--ink)}
.brand .dot{background:var(--grad-soft);-webkit-background-clip:text;background-clip:text;color:transparent}
.brand .tag{font-size:.6rem;font-weight:600;letter-spacing:.1em;text-transform:uppercase;
  color:var(--violet);background:var(--violet-tint);border-radius:var(--radius-pill);
  padding:.2em .6em;transform:translateY(-2px)}
.nav{margin-left:auto;display:flex;align-items:center;gap:.25rem}
.nav a{color:var(--ink-soft);font-size:.95rem;font-weight:500;padding:.5rem .8rem;border-radius:var(--radius-pill)}
.nav a:hover{color:var(--violet-dk);background:var(--violet-tint);text-decoration:none}
.nav .btn{margin-left:.45rem}
.nav-toggle{display:none}
.hamburger{display:none}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;gap:.5em;
  font-family:var(--font-head);font-weight:600;font-size:1rem;line-height:1;
  padding:.82em 1.4em;border-radius:var(--radius-pill);
  border:0;cursor:pointer;transition:.18s ease;white-space:nowrap;
}
.btn-primary{background:var(--grad);color:#fff;box-shadow:var(--shadow-violet)}
.btn-primary:hover{color:#fff;text-decoration:none;transform:translateY(-2px);box-shadow:0 18px 42px rgba(108,76,240,.38)}
.btn-ghost{background:var(--surface);color:var(--violet-dk);box-shadow:var(--shadow-sm)}
.btn-ghost:hover{background:#fff;color:var(--violet-dk);text-decoration:none;transform:translateY(-2px);box-shadow:var(--shadow)}
.btn-sm{font-size:.9rem;padding:.6em 1.1em}

/* ---------- hero ---------- */
.hero{
  background:
    radial-gradient(60% 120% at 85% -20%, rgba(255,126,182,.18) 0%, transparent 55%),
    radial-gradient(65% 120% at -5% 0%, rgba(108,76,240,.18) 0%, transparent 52%);
  border-bottom:1px solid var(--line);
}
.hero .inner{padding-block:clamp(2.6rem,6vw,4.6rem);max-width:760px}
.eyebrow{display:inline-flex;align-items:center;gap:.5em;font-size:.76rem;font-weight:600;
  letter-spacing:.06em;text-transform:uppercase;color:var(--violet-dk);
  background:var(--surface);border-radius:var(--radius-pill);
  padding:.45em .9em;margin-bottom:1.1rem;box-shadow:var(--shadow-sm)}
.hero h1{margin-bottom:.5rem}
.hero h1 .grad{background:var(--grad-soft);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero .lead{margin:0 0 1.7rem;max-width:40em}
.hero-cta{display:flex;flex-wrap:wrap;gap:.7rem;align-items:center}
.trust-strip{display:flex;flex-wrap:wrap;gap:.5rem;margin-top:1.7rem}
.chip{display:inline-flex;align-items:center;gap:.45em;font-size:.84rem;font-weight:500;
  color:var(--ink-soft);background:var(--surface);border-radius:var(--radius-pill);
  padding:.4em .85em;box-shadow:var(--shadow-sm)}
.chip .ck{color:var(--mint);font-weight:700}

/* ---------- card grid ---------- */
.grid{display:grid;gap:1.1rem;grid-template-columns:repeat(auto-fit,minmax(230px,1fr))}
.card{
  background:var(--surface);border-radius:var(--radius);
  padding:1.4rem;box-shadow:var(--shadow-sm);transition:.18s ease;display:block;border:1px solid transparent;
}
a.card:hover{text-decoration:none;transform:translateY(-4px);box-shadow:var(--shadow)}
.card .k{display:inline-flex;align-items:center;justify-content:center;width:34px;height:34px;
  border-radius:11px;background:var(--grad-soft);color:#fff;font-family:var(--font-head);
  font-weight:600;font-size:.84rem}
.card h3{font-size:1.12rem;margin:.7rem 0 .3rem}
.card p{margin:0;color:var(--ink-soft);font-size:.95rem;line-height:1.55}
.card .go{margin-top:.75rem;color:var(--violet);font-weight:600;font-size:.92rem}

/* ---------- breadcrumbs ---------- */
.crumbs{font-size:.86rem;color:var(--ink-faint);padding-top:1.4rem}
.crumbs a{color:var(--ink-soft)}
.crumbs a:hover{color:var(--violet-dk)}
.crumbs .sep{margin:0 .45em;color:var(--line)}

/* ---------- article prose ---------- */
.prose a{text-decoration:underline;text-underline-offset:2px;text-decoration-thickness:1.5px;text-decoration-color:rgba(91,75,232,.4)}
.prose a:hover{text-decoration-color:var(--violet-dk)}
.prose ul,.prose ol{margin:0 0 1.2em;padding-left:1.3em}
.prose li{margin:.4em 0}
.prose li::marker{color:var(--pink)}
.prose blockquote{
  margin:1.5em 0;padding:1.1rem 1.3rem;background:var(--violet-tint);
  border-left:4px solid var(--violet);border-radius:var(--radius-sm);
  color:var(--ink);font-size:1rem;
}
.prose blockquote p{margin:.3em 0}
.prose blockquote strong{color:var(--violet-dk)}
.prose code{font-family:var(--font-mono);font-size:.9em;background:var(--violet-tint);
  border-radius:6px;padding:.1em .42em;color:var(--violet-dk);font-weight:600}

/* tables — soft rounded */
.table-wrap{overflow-x:auto;margin:1.5em 0;border-radius:var(--radius);
  box-shadow:var(--shadow-sm);background:var(--surface)}
.prose table{width:100%;border-collapse:collapse;font-size:.95rem;min-width:min(100%,560px)}
.prose th,.prose td{text-align:left;padding:.85rem 1.1rem;border-bottom:1px solid var(--line);vertical-align:top}
.prose thead th{background:var(--violet-tint);font-family:var(--font-head);font-weight:600;
  color:var(--violet-dk);border-bottom:0}
.prose thead th:first-child{border-top-left-radius:var(--radius)}
.prose thead th:last-child{border-top-right-radius:var(--radius)}
.prose tbody tr:last-child td{border-bottom:0}
.prose tbody tr:nth-child(even) td{background:var(--surface-2)}

/* callouts */
.callout{margin:1.5em 0;padding:1.1rem 1.3rem;border-radius:var(--radius);
  background:var(--surface);box-shadow:var(--shadow-sm);display:flex;gap:.8rem}
.callout .ico{flex:none;font-size:1.1rem;line-height:1.5}
.callout.warn{background:var(--coral-tint)}
.callout.warn strong{color:var(--coral)}
.callout.tip{background:var(--violet-tint)}

/* verified chip */
.verified{display:inline-flex;align-items:center;gap:.45em;font-size:.78rem;font-weight:600;
  color:var(--mint);background:#e4faf4;border-radius:var(--radius-pill);padding:.3em .75em}

/* RG ribbon — soft gradient band */
.rg-ribbon{background:linear-gradient(90deg,var(--violet-tint),var(--pink-tint));
  border-bottom:1px solid var(--line);color:var(--ink-soft);font-size:.86rem}
.rg-ribbon .inner{display:flex;flex-wrap:wrap;align-items:center;gap:.6rem;padding-block:.75rem}
.rg-ribbon .pill18{font-weight:700;color:#fff;background:var(--grad-soft);
  border-radius:var(--radius-pill);padding:.14em .65em;font-size:.8rem}
.rg-ribbon a{color:var(--violet-dk);text-decoration:underline;font-weight:600}

/* ---------- footer — soft lavender ---------- */
.site-footer{background:#efecfa;color:var(--ink-soft);margin-top:3rem;
  border-top:3px solid transparent;border-image:var(--grad-soft) 1}
.site-footer a{color:var(--ink-soft)}
.site-footer a:hover{color:var(--violet-dk)}
.footer-top{display:grid;gap:2rem;grid-template-columns:1.4fr 1fr 1fr 1fr;padding-block:2.8rem 2rem}
.footer-brand .brand{color:var(--ink)}
.footer-brand .brand .dot{background:var(--grad-soft);-webkit-background-clip:text;background-clip:text;color:transparent}
.footer-brand p{color:var(--ink-faint);font-size:.9rem;max-width:30ch;margin:.9rem 0 0}
.fcol h4{font-family:var(--font-head);font-size:.76rem;letter-spacing:.08em;text-transform:uppercase;
  color:var(--violet-dk);font-weight:600;margin:0 0 .9rem}
.fcol ul{list-style:none;margin:0;padding:0}
.fcol li{margin:.5rem 0}
.fcol a{font-size:.94rem}
.footer-legal{border-top:1px solid #ddd6f3;padding-block:1.5rem;font-size:.84rem;color:var(--ink-faint)}
.footer-legal .disc{margin:0 0 .7rem;line-height:1.6}
.footer-legal .meta{display:flex;flex-wrap:wrap;gap:.4rem 1.1rem;align-items:center}
.footer-legal .pill18{font-weight:700;color:#fff;background:var(--grad-soft);
  border-radius:var(--radius-pill);padding:.12em .65em;font-size:.78rem}

/* skip link */
.skip{position:absolute;left:-999px;top:0;background:var(--violet);color:#fff;padding:.6em 1em;border-radius:0 0 var(--radius-sm) 0;z-index:100}
.skip:focus{left:0}

/* ---------- responsive ---------- */
@media (max-width:860px){
  .footer-top{grid-template-columns:1fr 1fr}
  .footer-brand{grid-column:1 / -1}
}
@media (max-width:720px){
  body{font-size:16px}
  .nav{position:fixed;inset:66px 0 auto 0;flex-direction:column;align-items:stretch;gap:0;
    background:var(--bg);border-bottom:1px solid var(--line);padding:.6rem 20px 1rem;
    transform:translateY(-130%);transition:transform .22s ease;box-shadow:var(--shadow)}
  .nav a{padding:.8rem .4rem;border-radius:12px;border-bottom:1px solid var(--line)}
  .nav a:hover{border-color:var(--line)}
  .nav .btn{margin:.8rem 0 0}
  .nav-toggle:checked ~ .nav{transform:translateY(0)}
  .hamburger{display:inline-flex;margin-left:auto;flex-direction:column;gap:4px;
    width:42px;height:38px;align-items:center;justify-content:center;cursor:pointer;
    border-radius:12px;background:var(--surface);box-shadow:var(--shadow-sm)}
  .hamburger span{display:block;width:19px;height:2px;background:var(--violet);border-radius:2px}
  .footer-top{grid-template-columns:1fr 1fr}
}
@media (max-width:460px){
  .footer-top{grid-template-columns:1fr}
  .brand .tag{display:none}
}
@media (prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto}}