/* ============================================================
   IPALinked — design system
   Dark theme (default) + light theme via [data-theme="light"]
   ============================================================ */

:root{
  --brand:#4F6BFF;
  --brand-2:#10B981;
  --brand-ink:#3B54E0;
  --android:#3DDC84;
  --ios:#9AA7C7;
  --amber:#F0B429;
  --danger:#F0616B;
  --grad:linear-gradient(120deg,var(--brand),var(--brand-2));
  --r:18px;
  --maxw:1140px;

  /* dark theme */
  --bg:#070B14;
  --bg-soft:#0B1120;
  --surface:#101828;
  --surface-2:#151F33;
  --line:#1E2A44;
  --line-strong:#2A3A5C;
  --ink:#EEF2FA;
  --ink-soft:#93A0BC;
  --ink-faint:#5D6B8A;
  --nav-bg:rgba(7,11,20,.78);
  --shadow:0 1px 2px rgba(0,0,0,.3),0 16px 40px rgba(0,0,0,.35);
  --shadow-lg:0 24px 70px rgba(0,0,0,.5);
  --glow:0 0 120px 30px rgba(79,107,255,.12);
  --dz-bg:#0D1425;
  --code-bg:#0B1120;
}
[data-theme="light"]{
  --bg:#EEF1F7;
  --bg-soft:#F7F9FC;
  --surface:#FFFFFF;
  --surface-2:#F2F5FA;
  --line:#DCE3EF;
  --line-strong:#C3CEE0;
  --ink:#0B1120;
  --ink-soft:#5A6780;
  --ink-faint:#8C99B3;
  --nav-bg:rgba(238,241,247,.82);
  --shadow:0 1px 2px rgba(11,17,32,.06),0 14px 34px rgba(11,17,32,.08);
  --shadow-lg:0 24px 60px rgba(11,17,32,.16);
  --glow:0 0 120px 30px rgba(79,107,255,.10);
  --dz-bg:#FBFCFE;
  --code-bg:#0B1120;
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:'Inter',system-ui,sans-serif;
  background:var(--bg);
  color:var(--ink);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
  transition:background .25s ease,color .25s ease;
}
h1,h2,h3,h4,.display{font-family:'Space Grotesk',sans-serif;letter-spacing:-.02em;line-height:1.08}
.mono{font-family:'JetBrains Mono',ui-monospace,monospace}
a{color:inherit;text-decoration:none}
img,svg{vertical-align:middle}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px}
section{position:relative}
:focus-visible{outline:2px solid var(--brand);outline-offset:2px;border-radius:6px}
::selection{background:rgba(79,107,255,.35)}

.grad-text{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}

/* ---------- buttons ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font-family:'Space Grotesk';font-weight:600;font-size:15px;border:none;border-radius:12px;padding:12px 20px;cursor:pointer;transition:transform .15s ease,box-shadow .2s ease,background .2s ease,border-color .2s;text-decoration:none;line-height:1.2}
.btn-primary{background:var(--grad);color:#fff;box-shadow:0 10px 26px rgba(79,107,255,.35)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 14px 32px rgba(79,107,255,.45)}
.btn-ghost{background:transparent;border:1px solid var(--line-strong);color:var(--ink)}
.btn-ghost:hover{border-color:var(--brand);background:var(--surface)}
.btn-lg{padding:15px 28px;font-size:16px;border-radius:14px}

/* ---------- nav ---------- */
header.nav{position:sticky;top:0;z-index:60;background:var(--nav-bg);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:68px;gap:16px}
.brand{display:flex;align-items:center;gap:11px;font-family:'Space Grotesk';font-weight:700;font-size:20px;letter-spacing:-.02em}
.brand img{width:34px;height:34px;border-radius:10px}
.brand .b2{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.nav-links{display:flex;align-items:center;gap:26px}
.nav-links a{font-size:14.5px;color:var(--ink-soft);font-weight:500;transition:color .15s}
.nav-links a:hover,.nav-links a.active{color:var(--ink)}
.nav-right{display:flex;align-items:center;gap:12px}

/* theme toggle */
.theme-btn{width:40px;height:40px;border-radius:11px;border:1px solid var(--line-strong);background:transparent;color:var(--ink);cursor:pointer;display:grid;place-items:center;transition:border-color .2s,background .2s}
.theme-btn:hover{border-color:var(--brand)}
.theme-btn svg{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
.theme-btn .sun{display:none}
[data-theme="light"] .theme-btn .sun{display:block}
[data-theme="light"] .theme-btn .moon{display:none}
.theme-btn .moon{display:block}

.menu-btn{display:none;background:none;border:1px solid var(--line-strong);border-radius:10px;width:42px;height:42px;cursor:pointer}
.menu-btn div{width:18px;height:2px;background:var(--ink);margin:3px auto;border-radius:2px}

/* ---------- sections ---------- */
.sec{padding:96px 0}
.sec-eyebrow{display:inline-block;font-family:'JetBrains Mono';font-size:12px;font-weight:500;letter-spacing:.08em;text-transform:uppercase;color:var(--brand);background:rgba(79,107,255,.1);border:1px solid rgba(79,107,255,.25);padding:6px 14px;border-radius:100px;margin-bottom:18px}
.sec-title{font-size:clamp(28px,3.6vw,42px);font-weight:700;margin-bottom:14px}
.sec-sub{font-size:17px;color:var(--ink-soft);max-width:640px}

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

/* ---------- footer ---------- */
footer.ft{border-top:1px solid var(--line);background:var(--bg-soft);padding:64px 0 30px}
.ft-inner{display:grid;grid-template-columns:1.2fr 2fr;gap:48px;margin-bottom:44px}
.ft-tag{font-size:14px;color:var(--ink-soft);margin-top:14px;max-width:300px}
.ft-links{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.ft-col h4{font-size:13px;text-transform:uppercase;letter-spacing:.08em;color:var(--ink-faint);margin-bottom:16px}
.ft-col a{display:block;font-size:14.5px;color:var(--ink-soft);margin-bottom:11px;transition:color .15s}
.ft-col a:hover{color:var(--ink)}
.ft-bottom{display:flex;align-items:center;justify-content:space-between;gap:14px;flex-wrap:wrap;padding-top:26px;border-top:1px solid var(--line);font-size:13px;color:var(--ink-faint)}
.status{display:inline-flex;align-items:center;gap:8px}
.status .dot{width:8px;height:8px;border-radius:50%;background:var(--brand-2);box-shadow:0 0 0 3px rgba(16,185,129,.2);animation:pulse 2.4s infinite}
@keyframes pulse{0%,100%{box-shadow:0 0 0 3px rgba(16,185,129,.2)}50%{box-shadow:0 0 0 6px rgba(16,185,129,.08)}}

/* ---------- reveal ---------- */
.reveal{opacity:0;transform:translateY(22px);transition:opacity .6s ease,transform .6s ease}
.reveal.in{opacity:1;transform:none}
@media(prefers-reduced-motion:reduce){.reveal{opacity:1;transform:none;transition:none}}

/* ---------- forms ---------- */
.input,input[type=text],input[type=email],input[type=password],textarea{width:100%;padding:13px 15px;border:1px solid var(--line-strong);border-radius:12px;font-family:'Inter';font-size:15px;background:var(--surface-2);color:var(--ink);transition:border-color .2s}
.input:focus,input:focus,textarea:focus{outline:none;border-color:var(--brand)}
textarea{resize:vertical;min-height:130px}
label.fl{display:block;font-size:13.5px;font-weight:600;margin:0 0 7px;color:var(--ink-soft)}

/* ---------- cookie consent ---------- */
.cookie-bar{position:fixed;left:50%;bottom:18px;transform:translate(-50%,140%);width:min(680px,calc(100vw - 32px));z-index:100;background:var(--surface);border:1px solid var(--line-strong);border-radius:16px;box-shadow:var(--shadow-lg);padding:18px 20px;display:flex;align-items:center;gap:18px;transition:transform .4s cubic-bezier(.2,.8,.25,1)}
.cookie-bar.show{transform:translate(-50%,0)}
.cookie-txt{font-size:13.5px;color:var(--ink-soft);line-height:1.5;flex:1}
.cookie-txt b{color:var(--ink)}
.cookie-btns{display:flex;gap:9px;flex:none}
.cookie-btn{font-family:'Space Grotesk';font-weight:600;font-size:13.5px;padding:10px 18px;border-radius:10px;cursor:pointer;border:1px solid var(--line-strong);background:transparent;color:var(--ink);transition:border-color .2s,background .2s}
.cookie-btn:hover{border-color:var(--brand)}
.cookie-btn.accept{background:var(--grad);color:#fff;border:none}
.cookie-btn.accept:hover{opacity:.92}
@media(max-width:640px){.cookie-bar{flex-direction:column;align-items:stretch;text-align:center}.cookie-btns{justify-content:center}}

/* ---------- responsive ---------- */
@media(max-width:920px){
  .nav-links{position:fixed;inset:68px 0 auto 0;background:var(--bg-soft);border-bottom:1px solid var(--line);flex-direction:column;align-items:flex-start;gap:0;padding:10px 24px;display:none}
  .nav-links.open{display:flex}
  .nav-links a{padding:13px 0;width:100%;font-size:16px}
  .menu-btn{display:block}
  .ft-inner{grid-template-columns:1fr;gap:36px}
  .sec{padding:72px 0}
}