* { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #f4f6fb;
  --bg-grad: radial-gradient(1100px 600px at 80% -10%, rgba(47,107,255,.14), transparent 60%),
             radial-gradient(900px 500px at 0% 0%, rgba(52,211,153,.10), transparent 55%),
             linear-gradient(180deg, #fbfcff, #eef1f7 80%);
  --card: #ffffff;
  --card-border: rgba(20,30,60,.09);
  --text: #161922;
  --muted: #5d6475;
  --accent: #2f6bff;
  --accent-h: #1f5aef;
  --green: #0f9d6b;
  --shadow: 0 18px 50px rgba(20,30,60,.12);
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #15161a;
    --bg-grad: radial-gradient(1100px 600px at 80% -10%, rgba(91,140,255,.16), transparent 60%),
               radial-gradient(900px 500px at 0% 0%, rgba(52,211,153,.10), transparent 55%),
               linear-gradient(180deg, #202024, #131318 80%);
    --card: rgba(255,255,255,.045);
    --card-border: rgba(255,255,255,.09);
    --text: #f1f3f8;
    --muted: #9aa0b4;
    --accent: #5b8cff;
    --accent-h: #76a0ff;
    --green: #34d399;
    --shadow: 0 18px 50px rgba(0,0,0,.45);
  }
}

html { scroll-behavior: smooth; }
body {
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
  background: var(--bg);
  background-image: var(--bg-grad);
  background-attachment: fixed;
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}

/* Nav */
.nav {
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px 28px; max-width: 1100px; margin: 0 auto;
}
.nav-brand { display: flex; align-items: center; gap: 11px; font-weight: 700; font-size: 19px; }
.nav-brand img { width: 36px; height: 36px; border-radius: 9px; }
.nav-links { display: flex; align-items: center; gap: 22px; }
.nav-links a { color: var(--muted); text-decoration: none; font-size: 14.5px; font-weight: 500; transition: color .15s; }
.nav-links a:hover { color: var(--text); }
.nav-dl {
  background: var(--accent); color: #fff !important; padding: 8px 18px; border-radius: 10px; font-weight: 600;
}
.nav-dl:hover { background: var(--accent-h); }
a[data-disabled="true"] { pointer-events: none; opacity: .55; }

/* Hero */
.hero { text-align: center; padding: 56px 24px 64px; max-width: 760px; margin: 0 auto; }
.hero-logo { width: 120px; height: 120px; border-radius: 30px; box-shadow: var(--shadow); margin-bottom: 22px; }
.hero h1 { font-size: 52px; letter-spacing: -.5px; margin-bottom: 14px; }
.tagline { font-size: 19px; color: var(--muted); margin-bottom: 32px; }
.btn-download {
  display: inline-flex; align-items: center; gap: 11px;
  background: var(--accent); color: #fff; text-decoration: none;
  font-size: 18px; font-weight: 700; padding: 16px 34px; border-radius: 15px;
  box-shadow: 0 12px 30px rgba(47,107,255,.4); transition: transform .12s, background .15s, box-shadow .15s;
}
.btn-download:hover { background: var(--accent-h); transform: translateY(-2px); box-shadow: 0 18px 40px rgba(47,107,255,.5); }
.btn-download:active { transform: translateY(0); }
.sub { margin-top: 16px; font-size: 14px; color: var(--muted); }

/* Sections */
.section { max-width: 1080px; margin: 0 auto; padding: 48px 24px; }
.section h2 { font-size: 33px; text-align: center; margin-bottom: 8px; letter-spacing: -.3px; }
.section-intro { text-align: center; color: var(--muted); font-size: 16px; margin-bottom: 38px; }

/* Steps */
.steps { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 20px; }
.step {
  background: var(--card); border: 1px solid var(--card-border); border-radius: 18px;
  padding: 26px 24px; box-shadow: var(--shadow); transition: transform .15s, border-color .15s;
}
.step:hover { transform: translateY(-4px); border-color: var(--accent); }
.step-no {
  width: 44px; height: 44px; border-radius: 13px; display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, var(--accent), var(--accent-h)); color: #fff; font-weight: 800; font-size: 19px;
  margin-bottom: 16px; box-shadow: 0 8px 18px rgba(47,107,255,.35);
}
.step h3 { font-size: 19px; margin-bottom: 8px; }
.step p { color: var(--muted); font-size: 14.5px; }
.step b { color: var(--text); }

/* Support */
.support { max-width: 720px; }
.support-card {
  background: var(--card); border: 1px solid var(--card-border); border-radius: 20px;
  padding: 26px 28px; box-shadow: var(--shadow); display: flex; align-items: center; gap: 20px; flex-wrap: wrap;
}
.support-card > svg { color: var(--green); flex-shrink: 0; }
.support-card > div { flex: 1; min-width: 160px; }
.support-label { display: block; font-size: 13px; color: var(--muted); text-transform: uppercase; letter-spacing: .8px; }
.support-phone { display: block; font-size: 27px; font-weight: 800; color: var(--text); text-decoration: none; letter-spacing: .5px; }
.support-phone:hover { color: var(--accent); }
.support-wa {
  background: var(--green); color: #fff; text-decoration: none; font-weight: 700; font-size: 15px;
  padding: 12px 22px; border-radius: 12px; transition: opacity .15s, transform .12s;
}
.support-wa:hover { opacity: .9; transform: translateY(-1px); }

/* Footer */
.footer { text-align: center; padding: 46px 24px 56px; color: var(--muted); border-top: 1px solid var(--card-border); margin-top: 30px; }
.footer img { width: 46px; height: 46px; border-radius: 12px; margin-bottom: 12px; }
.footer p { font-size: 14.5px; }
.footer .small { font-size: 13px; opacity: .8; margin-top: 4px; }

@media (max-width: 560px) {
  .hero h1 { font-size: 40px; }
  .nav-links a:not(.nav-dl) { display: none; }
  .support-phone { font-size: 22px; }
}