/* ===========================================================
   MathGate — marketing + legal site
   Brand palette mirrors the app (purple / gold / green, rounded & friendly)
   =========================================================== */
@import url('https://fonts.googleapis.com/css2?family=Baloo+2:wght@500;600;700;800&family=Nunito:wght@400;500;600;700;800&display=swap');

:root{
  --purple:#6C5CE0;
  --purple-light:#8B7CF6;
  --purple-deep:#2A2150;
  --purple-deep2:#3B2E72;
  --green:#46B946;
  --green-light:#6FD86F;
  --gold:#FFCF5C;
  --gold-deep:#F2A93B;
  --coral:#FF8FB1;
  --blue:#5AB8FF;
  --ink:#2A2150;
  --muted:#6B6685;
  --card:#ffffff;
  --bg:#F6F3FF;
  --radius:22px;
  --shadow:0 18px 50px rgba(42,33,80,.12);
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:'Nunito',system-ui,-apple-system,Segoe UI,Roboto,sans-serif;
  color:var(--ink);
  background:var(--bg);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,.brand{font-family:'Baloo 2','Nunito',sans-serif;line-height:1.15}
a{color:var(--purple);text-decoration:none}
a:hover{text-decoration:underline}
.wrap{max-width:1080px;margin:0 auto;padding:0 22px}
.center{text-align:center}

/* ---------- Top nav ---------- */
.nav{position:sticky;top:0;z-index:50;backdrop-filter:saturate(160%) blur(12px);
  background:rgba(246,243,255,.82);border-bottom:1px solid rgba(108,92,224,.10)}
.nav .wrap{display:flex;align-items:center;justify-content:space-between;height:68px}
.brand{display:flex;align-items:center;gap:11px;font-weight:800;font-size:22px;color:var(--ink)}
.brand img{width:38px;height:38px;border-radius:10px;box-shadow:0 4px 12px rgba(42,33,80,.18)}
.nav-links{display:flex;gap:22px;align-items:center;font-weight:700}
.nav-links a{color:var(--ink);opacity:.8}
.btn{display:inline-flex;align-items:center;gap:8px;font-weight:800;font-family:'Baloo 2',sans-serif;
  border:none;cursor:pointer;border-radius:16px;padding:13px 22px;font-size:16px;
  color:#fff;background:linear-gradient(180deg,var(--green-light),var(--green));
  box-shadow:0 6px 0 #2f9e2f, 0 12px 24px rgba(70,185,70,.32);transition:transform .08s, box-shadow .08s}
.btn:hover{text-decoration:none;transform:translateY(-1px)}
.btn:active{transform:translateY(4px);box-shadow:0 2px 0 #2f9e2f}
.btn.purple{background:linear-gradient(180deg,var(--purple-light),var(--purple));box-shadow:0 6px 0 #5648c2,0 12px 24px rgba(108,92,224,.32)}
.btn.purple:active{box-shadow:0 2px 0 #5648c2}

/* ---------- Hero ---------- */
.hero{position:relative;overflow:hidden;color:#fff;
  background:radial-gradient(1200px 600px at 80% -10%,rgba(139,124,246,.55),transparent 60%),
             linear-gradient(160deg,var(--purple-deep2),var(--purple-deep))}
.hero .wrap{padding:64px 22px 86px;display:grid;grid-template-columns:1.1fr .9fr;gap:30px;align-items:center}
.hero h1{font-size:clamp(34px,5vw,56px);font-weight:800;margin-bottom:14px}
.hero h1 .hl{color:var(--gold)}
.hero p.sub{font-size:19px;color:rgba(255,255,255,.82);max-width:34ch;margin-bottom:26px}
.hero .cta-row{display:flex;gap:14px;flex-wrap:wrap;align-items:center}
.trust{display:flex;gap:10px;flex-wrap:wrap;margin-top:26px}
.pill{display:inline-flex;align-items:center;gap:7px;background:rgba(255,255,255,.10);
  border:1px solid rgba(255,255,255,.18);padding:8px 13px;border-radius:999px;font-weight:700;font-size:13px}
.hero-art{display:flex;justify-content:center;align-items:center;position:relative}
.hero-art .glow{position:absolute;width:330px;height:330px;border-radius:50%;
  background:radial-gradient(circle,rgba(139,124,246,.6),transparent 65%);filter:blur(8px)}
.hero-art img{width:min(360px,80%);position:relative;z-index:2;
  filter:drop-shadow(0 26px 40px rgba(0,0,0,.35));animation:bob 4.5s ease-in-out infinite}
@keyframes bob{0%,100%{transform:translateY(0)}50%{transform:translateY(-14px)}}
.floaty{position:absolute;color:rgba(255,255,255,.16);font-weight:800;font-family:'Baloo 2',sans-serif;z-index:1}

/* ---------- Sections ---------- */
section{padding:72px 0}
.kicker{display:inline-block;font-weight:800;color:var(--purple);letter-spacing:.04em;
  text-transform:uppercase;font-size:13px;background:rgba(108,92,224,.10);padding:6px 12px;border-radius:999px;margin-bottom:14px}
h2.sec{font-size:clamp(28px,3.5vw,40px);font-weight:800;margin-bottom:12px}
.lead{color:var(--muted);font-size:18px;max-width:60ch;margin:0 auto}

.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:42px}
.feature{background:var(--card);border-radius:var(--radius);padding:26px;box-shadow:var(--shadow);
  border:1px solid rgba(108,92,224,.08)}
.feature .ic{width:54px;height:54px;border-radius:15px;display:grid;place-items:center;font-size:26px;margin-bottom:14px}
.feature h3{font-size:21px;margin-bottom:6px}
.feature p{color:var(--muted);font-size:15.5px}

.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:42px}
.step{background:linear-gradient(180deg,#fff,#faf8ff);border-radius:var(--radius);padding:28px 24px;
  box-shadow:var(--shadow);border:1px solid rgba(108,92,224,.08);position:relative}
.step .num{font-family:'Baloo 2',sans-serif;font-weight:800;color:#fff;background:var(--purple);
  width:40px;height:40px;border-radius:12px;display:grid;place-items:center;font-size:20px;margin-bottom:14px}
.step h3{font-size:20px;margin-bottom:6px}
.step p{color:var(--muted);font-size:15.5px}

/* ---------- Pricing ---------- */
.pricing{background:linear-gradient(180deg,#efe9ff,#f6f3ff)}
.plans{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:42px}
.plan{background:#fff;border-radius:var(--radius);padding:26px 22px;box-shadow:var(--shadow);
  border:2px solid rgba(108,92,224,.10);position:relative;text-align:center}
.plan.best{border-color:var(--purple);transform:translateY(-6px)}
.plan .tag{position:absolute;top:-12px;left:50%;transform:translateX(-50%);background:var(--gold);
  color:#6B4E0E;font-weight:800;font-size:12px;padding:5px 12px;border-radius:999px}
.plan h3{font-size:20px;margin-bottom:8px}
.plan .price{font-family:'Baloo 2',sans-serif;font-weight:800;font-size:34px;color:var(--ink)}
.plan .per{color:var(--muted);font-size:14px;margin-bottom:8px}
.plan .note{font-size:13px;color:var(--green);font-weight:700;min-height:18px}
.trial-banner{display:inline-flex;gap:8px;align-items:center;background:linear-gradient(180deg,var(--gold),var(--gold-deep));
  color:#6B4E0E;font-weight:800;padding:10px 18px;border-radius:999px;margin-top:8px}

/* ---------- Article (privacy/support) ---------- */
.page-head{background:linear-gradient(160deg,var(--purple-deep2),var(--purple-deep));color:#fff;padding:54px 0 46px}
.page-head h1{font-size:clamp(30px,4vw,44px);font-weight:800}
.page-head p{color:rgba(255,255,255,.78);margin-top:8px}
.article{background:#fff;margin:-34px auto 60px;max-width:840px;border-radius:var(--radius);
  box-shadow:var(--shadow);padding:46px 44px;position:relative;border:1px solid rgba(108,92,224,.08)}
.article h2{font-size:24px;margin:30px 0 10px;color:var(--ink)}
.article h2:first-child{margin-top:0}
.article p,.article li{color:#41415a;font-size:16px;margin-bottom:12px}
.article ul{padding-left:22px;margin-bottom:12px}
.article .updated{color:var(--muted);font-size:14px;margin-bottom:22px}
.callout{background:#f3f0ff;border-left:4px solid var(--purple);border-radius:12px;padding:16px 18px;margin:18px 0}
.faq{border-bottom:1px solid rgba(108,92,224,.12);padding:18px 0}
.faq h3{font-size:18px;margin-bottom:6px;color:var(--ink)}
.faq p{color:#41415a;margin:0}

/* ---------- Footer ---------- */
footer{background:var(--purple-deep);color:rgba(255,255,255,.7);padding:46px 0 36px}
footer .wrap{display:flex;justify-content:space-between;gap:24px;flex-wrap:wrap;align-items:flex-start}
footer .brand{color:#fff;margin-bottom:8px}
footer a{color:rgba(255,255,255,.78);font-weight:600}
footer .cols{display:flex;gap:54px;flex-wrap:wrap}
footer .col h4{font-family:'Baloo 2',sans-serif;color:#fff;margin-bottom:10px;font-size:15px}
footer .col a{display:block;margin-bottom:7px}
.copyright{margin-top:28px;font-size:13px;opacity:.65}

/* ---------- Responsive ---------- */
@media(max-width:860px){
  .hero .wrap{grid-template-columns:1fr;text-align:center;padding-top:46px}
  .hero p.sub{margin-left:auto;margin-right:auto}
  .hero .cta-row,.trust{justify-content:center}
  .hero-art{order:-1}
  .grid,.steps{grid-template-columns:1fr}
  .plans{grid-template-columns:repeat(2,1fr)}
  .plan.best{transform:none}
  .article{padding:32px 22px;margin-top:-28px}
  .nav-links a:not(.btn){display:none}
}
@media(max-width:480px){.plans{grid-template-columns:1fr}}