:root {
    --bg: #f5f7fb;
    --surface: #ffffff;
    --surface-2: #eef1f7;
    --text: #171d2c;
    --muted: #5c6577;
    --border: #dde2ea;
    --navy: #0e1730;
    --navy-2: #141e3c;
    --blue: #2955d1;
    --blue-bright: #4f7fff;
    --blue-soft: #e8edfc;
    --amber: #f0a94e;
    --ok: #16a34a;
    --ok-soft: #dcf5e6;
    --warn: #ea580c;
    --warn-soft: #fde6cf;
    --crit: #dc2626;
    --crit-soft: #fde2e1;
  }

  * { box-sizing: border-box; }
  html { scroll-behavior: smooth; }
  body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font-family: "IBM Plex Sans", "Segoe UI", sans-serif;
    line-height: 1.6;
  }
  img { max-width: 100%; display: block; }
  a { color: inherit; }
  .wrap { max-width: 1120px; margin: 0 auto; padding: 0 28px; }

  h1, h2, h3 {
    font-family: "Be Vietnam Pro", "Segoe UI", sans-serif;
    font-weight: 800;
    letter-spacing: -.01em;
    text-wrap: balance;
    margin: 0;
  }

  /* ---------- nav ---------- */
  header.nav {
    position: sticky; top: 0; z-index: 20;
    background: rgba(245,247,251,.86);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
  }
  header.nav .wrap {
    height: 72px;
    display: flex; align-items: center; justify-content: space-between;
  }
  .brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 1.05rem; text-decoration: none; }
  .brand img { width: 34px; height: 34px; border-radius: 9px; }
  nav.links { display: flex; align-items: center; gap: 28px; }
  nav.links a { text-decoration: none; font-size: .92rem; font-weight: 500; color: var(--muted); }
  nav.links a:hover { color: var(--text); }
  .btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 8px;
    padding: 12px 22px; border-radius: 11px; font-weight: 600; font-size: .95rem;
    text-decoration: none; border: 1px solid transparent; cursor: pointer;
  }
  .btn-primary { background: var(--blue); color: #fff; box-shadow: 0 10px 24px rgba(41,85,209,.28); }
  .btn-primary:hover { background: #2247b8; }
  .btn-ghost { background: transparent; border-color: var(--border); color: var(--text); }
  .btn-ghost:hover { border-color: var(--blue); color: var(--blue); }
  .btn-sm { padding: 9px 16px; font-size: .85rem; border-radius: 9px; }

  /* ---------- hero ---------- */
  .hero {
    position: relative;
    background:
      radial-gradient(680px 520px at 82% -10%, rgba(79,127,255,.30), transparent 60%),
      radial-gradient(420px 420px at 100% 60%, rgba(240,169,78,.14), transparent 65%),
      var(--navy);
    overflow: hidden;
    padding: 84px 0 96px;
  }
  .hero::before {
    content: "";
    position: absolute; inset: 0;
    background-image: radial-gradient(rgba(255,255,255,.05) 1.4px, transparent 1.4px);
    background-size: 26px 26px;
  }
  .hero .wrap {
    position: relative;
    display: grid;
    grid-template-columns: 1.05fr .95fr;
    gap: 48px;
    align-items: center;
  }
  .eyebrow {
    display: inline-block;
    font-size: .78rem; font-weight: 600; letter-spacing: .08em; text-transform: uppercase;
    color: #a9bcff;
    background: rgba(79,127,255,.14);
    border: 1px solid rgba(79,127,255,.3);
    padding: 6px 14px; border-radius: 999px;
    margin-bottom: 22px;
  }
  .hero h1 {
    color: #fff;
    font-size: 3.4rem;
    line-height: 1.04;
  }
  .hero h1 span { color: var(--blue-bright); }
  .hero p.lead {
    margin-top: 22px;
    color: #c4cde8;
    font-size: 1.14rem;
    max-width: 480px;
  }
  .hero p.lead b { color: #fff; font-weight: 600; }
  .hero-ctas { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 32px; }
  .btn-outline-light {
    background: rgba(255,255,255,.06); border: 1px solid rgba(255,255,255,.22); color: #fff;
  }
  .btn-outline-light:hover { border-color: rgba(255,255,255,.5); }

  .trust-row { display: flex; flex-wrap: wrap; gap: 18px 26px; margin-top: 34px; }
  .trust-item { display: flex; align-items: center; gap: 8px; font-size: .85rem; color: #b7c1de; }
  .trust-item .dot { width: 7px; height: 7px; border-radius: 50%; background: #4fd6a4; flex-shrink: 0; }

  /* mockup cards, echo real app UI */
  .mock-wrap { position: relative; height: 420px; }
  .mcard {
    position: absolute; width: 320px;
    background: #fff; border-radius: 16px; padding: 18px 20px;
    box-shadow: 0 22px 48px rgba(4,10,30,.5);
  }
  .mcard .top { display: flex; justify-content: space-between; gap: 10px; align-items: flex-start; }
  .mcard .title { font-size: 1.05rem; font-weight: 700; color: #171d2c; }
  .mcard .meta { margin-top: 4px; font-size: .8rem; color: #7c8598; }
  .mcard .bottom { display: flex; justify-content: space-between; align-items: flex-end; margin-top: 14px; }
  .mcard .date { font-size: .76rem; color: #97a0b2; }
  .mcard .days { font-size: .92rem; font-weight: 700; margin-top: 2px; }
  .stripe { position: absolute; left: 0; top: 0; bottom: 0; width: 4px; border-radius: 16px 0 0 16px; }
  .badge { font-size: .7rem; font-weight: 600; padding: 4px 10px; border-radius: 999px; }
  .mc1 { top: 0; right: 10px; z-index: 3; }
  .mc2 { top: 150px; right: 40px; transform: rotate(2.4deg); z-index: 2; opacity: .97; }
  .mc3 { top: 292px; right: 66px; transform: rotate(4.4deg); z-index: 1; opacity: .92; }

  /* ---------- sections ---------- */
  section { padding: 88px 0; }
  .section-head { max-width: 620px; margin: 0 auto 48px; text-align: center; }
  .section-head h2 { font-size: 2.1rem; }
  .section-head p { margin-top: 14px; color: var(--muted); font-size: 1.02rem; }

  .feat-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
  .feat-card {
    background: var(--surface); border: 1px solid var(--border); border-radius: 16px;
    padding: 26px 24px;
  }
  .feat-card .ic {
    width: 46px; height: 46px; border-radius: 12px;
    display: flex; align-items: center; justify-content: center;
    font-size: 1.3rem; margin-bottom: 16px;
    background: var(--blue-soft);
  }
  .feat-card h3 { font-size: 1.06rem; font-weight: 700; margin-bottom: 8px; }
  .feat-card p { margin: 0; font-size: .89rem; color: var(--muted); }
  .feat-card.wide { grid-column: span 1; }

  .strip {
    background: var(--navy-2);
    color: #dfe4f2;
  }
  .strip .wrap {
    display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px;
    text-align: center; padding: 56px 28px;
  }
  .strip .stat b { display: block; font-family: "Be Vietnam Pro", sans-serif; font-size: 2.1rem; font-weight: 800; color: #fff; }
  .strip .stat span { font-size: .88rem; color: #9fabc9; }

  .offline-section .wrap { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; }
  .offline-copy .badge-row { display: flex; align-items: center; gap: 10px; margin-bottom: 18px; }
  .offline-copy h2 { font-size: 2rem; margin-bottom: 16px; }
  .offline-copy p { color: var(--muted); font-size: 1.02rem; margin-bottom: 14px; max-width: 460px; }
  .check-list { list-style: none; padding: 0; margin: 22px 0 0; display: flex; flex-direction: column; gap: 12px; }
  .check-list li { display: flex; gap: 10px; align-items: flex-start; font-size: .95rem; color: var(--text); }
  .check-list .tick {
    width: 20px; height: 20px; border-radius: 50%; background: var(--ok-soft); color: var(--ok);
    display: flex; align-items: center; justify-content: center; font-size: .72rem; font-weight: 700; flex-shrink: 0; margin-top: 1px;
  }

  .phone-frame {
    background: var(--navy);
    border-radius: 34px;
    padding: 14px;
    max-width: 300px;
    margin: 0 auto;
    box-shadow: 0 30px 60px rgba(14,23,48,.35);
  }
  .phone-screen {
    background: #f5f7fb;
    border-radius: 22px;
    overflow: hidden;
    padding: 16px 14px 20px;
  }
  .phone-screen .app-bar {
    background: var(--blue);
    color: #fff;
    border-radius: 14px;
    padding: 12px 14px;
    font-size: .82rem; font-weight: 600;
    margin-bottom: 12px;
  }
  .phone-card {
    background: #fff; border-radius: 12px; padding: 12px 14px; margin-bottom: 10px;
    border-left: 3px solid var(--crit);
    box-shadow: 0 1px 3px rgba(0,0,0,.06);
  }
  .phone-card.mid { border-left-color: var(--warn); }
  .phone-card.ok { border-left-color: var(--ok); }
  .phone-card .r1 { display: flex; justify-content: space-between; font-size: .84rem; font-weight: 700; }
  .phone-card .r2 { font-size: .72rem; color: #8b93a4; margin-top: 3px; }
  .phone-card .r3 { display: flex; justify-content: space-between; align-items: flex-end; gap: 8px; margin-top: 8px; flex-wrap: wrap; }
  .phone-card .r3 .d { font-size: .68rem; color: #9aa2b3; }
  .phone-card .r3 .n { font-size: .78rem; font-weight: 700; }
  .n-crit { color: var(--crit); } .n-warn { color: var(--warn); } .n-ok { color: var(--ok); }

  /* ---------- download cta ---------- */
  .cta {
    background: linear-gradient(180deg, var(--navy) 0%, var(--navy-2) 100%);
    color: #fff; text-align: center;
  }
  .cta .wrap { padding: 78px 28px; }
  .cta h2 { color: #fff; font-size: 2.1rem; margin-bottom: 14px; }
  .cta p { color: #c4cde8; max-width: 480px; margin: 0 auto 30px; font-size: 1.02rem; }
  .cta .ctas { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }
  .note-small { margin-top: 18px; font-size: .82rem; color: #8b96b8; }

  footer {
    padding: 36px 0;
    border-top: 1px solid var(--border);
  }
  footer .wrap { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 14px; }
  footer .flinks { display: flex; gap: 22px; font-size: .88rem; }
  footer .flinks a { text-decoration: none; color: var(--muted); }
  footer .flinks a:hover { color: var(--blue); }
  footer .copy { font-size: .82rem; color: var(--muted); }

  @media (max-width: 880px) {
    nav.links { display: none; }
    .hero .wrap { grid-template-columns: 1fr; }
    .mock-wrap { height: 360px; margin-top: 12px; }
    .mc1, .mc2, .mc3 { right: 50%; transform: translateX(50%) rotate(0); width: 280px; }
    .mc2 { top: 130px; }
    .mc3 { top: 260px; }
    .feat-grid { grid-template-columns: 1fr 1fr; }
    .strip .wrap { grid-template-columns: 1fr; padding: 40px 28px; }
    .offline-section .wrap { grid-template-columns: 1fr; }
    .hero h1 { font-size: 2.5rem; }
  }
  @media (max-width: 560px) {
    .feat-grid { grid-template-columns: 1fr; }
  }