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

:root {
  --blue: #2AABEE;
  --blue-dark: #229ED9;
  --ink: #1a2430;
  --muted: #5c6b7a;
  --bg: #ffffff;
  --bg-alt: #f3f8fc;
  --line: #e6ecf1;
}

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.55;
}

a { color: var(--blue-dark); text-decoration: none; }

/* ---------- Nav ---------- */

.nav {
  position: sticky;
  top: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 6vw;
  background: rgba(255, 255, 255, .92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
  z-index: 10;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 19px;
  color: var(--ink);
}
.nav-links { display: flex; align-items: center; gap: 26px; }
.nav-links a { color: var(--muted); font-weight: 500; }
.nav-links a:hover { color: var(--ink); }

/* ---------- Buttons ---------- */

.btn {
  display: inline-block;
  background: var(--blue);
  color: white !important;
  font-weight: 600;
  padding: 10px 22px;
  border-radius: 10px;
  transition: transform .12s, background .12s;
}
.btn:hover { background: var(--blue-dark); transform: translateY(-1px); }
.btn-small { padding: 8px 18px; }
.btn-big { padding: 14px 28px; font-size: 17px; }
.btn-ghost {
  background: transparent;
  color: var(--blue-dark) !important;
  border: 2px solid var(--blue);
}
.btn-ghost:hover { background: rgba(42, 171, 238, .08); }

/* ---------- Hero ---------- */

.hero {
  display: flex;
  align-items: center;
  gap: 6vw;
  padding: 9vh 6vw 10vh;
  max-width: 1280px;
  margin: 0 auto;
}
.hero-copy { flex: 1.1; min-width: 0; }
.hero h1 { font-size: clamp(32px, 4.4vw, 54px); line-height: 1.12; letter-spacing: -.02em; }
.sub { font-size: 19px; color: var(--muted); margin: 22px 0 30px; max-width: 56ch; }
.cta-row { display: flex; gap: 14px; flex-wrap: wrap; }
.fine { margin-top: 16px; font-size: 14px; color: var(--muted); }

/* ---------- Hero mockup ---------- */

.hero-mock {
  flex: 1;
  max-width: 460px;
  min-width: 320px;
  background: #8db09f url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='80' height='80' viewBox='0 0 80 80'%3E%3Cg fill='%23ffffff' fill-opacity='0.06'%3E%3Ccircle cx='20' cy='20' r='6'/%3E%3Ccircle cx='60' cy='60' r='6'/%3E%3Crect x='52' y='12' width='14' height='14' rx='4'/%3E%3Crect x='12' y='52' width='14' height='14' rx='4'/%3E%3C/g%3E%3C/svg%3E");
  border-radius: 18px;
  box-shadow: 0 24px 60px rgba(20, 50, 80, .25);
  overflow: hidden;
  font-size: 14.5px;
}
.mock-header {
  display: flex;
  align-items: center;
  gap: 10px;
  background: white;
  padding: 10px 14px;
  border-bottom: 1px solid var(--line);
}
.mock-avatar {
  width: 38px; height: 38px;
  border-radius: 50%;
  color: white; font-weight: 600;
  display: flex; align-items: center; justify-content: center;
}
.mock-avatar.c3 { background: linear-gradient(#a0de7e, #54cb68); }
.mock-title { font-weight: 600; }
.mock-status { font-size: 12.5px; color: var(--blue); }
.mock-lock { margin-left: auto; }

.mock-body { padding: 14px 14px 6px; display: flex; flex-direction: column; }
.mock-day {
  align-self: center;
  background: rgba(0,0,0,.25);
  color: white;
  font-size: 12px;
  padding: 2px 10px;
  border-radius: 10px;
  margin-bottom: 10px;
}
.mock-row { display: flex; margin-bottom: 6px; }
.mock-row.out { justify-content: flex-end; }
.mock-bubble {
  max-width: 84%;
  background: white;
  border-radius: 12px;
  padding: 6px 10px 7px;
  box-shadow: 0 1px 1px rgba(0,0,0,.08);
}
.mock-bubble.out { background: #effdde; }
.mock-sender { display: block; font-weight: 600; font-size: 13px; }
.mock-sender.s2 { color: #6271e3; }
.mock-sender.s5 { color: #2a9ef1; }
.mock-meta { float: right; margin: 10px -2px 0 8px; font-size: 11px; color: #8b9aa6; }
.mock-meta .ticks, .ticks { color: #4fae4e; font-style: normal; letter-spacing: -2px; }
.mock-voice { display: flex; align-items: center; gap: 8px; margin: 6px 0 2px; color: #5c6b7a; font-size: 12.5px; }
.mock-play {
  width: 32px; height: 32px;
  background: var(--blue); color: white;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 12px;
}
.mock-track { flex: 1; min-width: 90px; height: 4px; background: rgba(42,171,238,.2); border-radius: 2px; overflow: hidden; }
.mock-track span { display: block; width: 55%; height: 100%; background: var(--blue); }
.mock-rx {
  display: inline-block;
  background: rgba(42,171,238,.12);
  color: var(--blue-dark);
  border-radius: 10px;
  padding: 1px 8px;
  font-size: 12.5px;
  font-weight: 600;
  margin: 6px 4px 0 0;
}
.mock-rx.mine { background: var(--blue); color: white; }
.mock-sys {
  align-self: center;
  background: rgba(0,0,0,.2);
  color: white;
  font-size: 12px;
  padding: 2px 10px;
  border-radius: 10px;
  margin: 4px 0 8px;
}
.mock-composer {
  display: flex;
  align-items: center;
  background: white;
  margin: 0 12px 12px;
  border-radius: 10px;
  padding: 10px 14px;
  color: #9aa6b0;
}
.mock-send { margin-left: auto; color: var(--blue); }

/* ---------- Sections ---------- */

.section { padding: 72px 6vw; max-width: 1280px; margin: 0 auto; }
.section h2 { font-size: clamp(26px, 3vw, 38px); letter-spacing: -.01em; margin-bottom: 36px; }
.section-alt { background: var(--bg-alt); max-width: none; }
.section-alt > * { max-width: 1152px; margin-left: auto; margin-right: auto; }
.section-alt h2 { margin-bottom: 36px; }

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 18px;
}
.card {
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 22px;
  transition: transform .12s, box-shadow .12s;
}
.card:hover { transform: translateY(-3px); box-shadow: 0 10px 28px rgba(20,50,80,.08); }
.card .ic { font-size: 26px; margin-bottom: 10px; }
.card h3 { margin-bottom: 6px; font-size: 17px; }
.card p { color: var(--muted); font-size: 14.5px; }

.cols { display: flex; gap: 48px; flex-wrap: wrap; align-items: flex-start; }
.cols > * { flex: 1; min-width: 280px; }
.cols h3 { margin-bottom: 12px; }
.cols ul { list-style: none; }
.cols li { padding: 6px 0 6px 28px; position: relative; color: var(--muted); }
.cols li::before { content: "✓"; position: absolute; left: 4px; color: var(--blue); font-weight: 700; }
.cols p { color: var(--muted); }
.cols .btn { margin-top: 18px; }

.code {
  background: #14212e;
  color: #d8e6f3;
  border-radius: 14px;
  padding: 24px 26px;
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 15px;
  line-height: 1.9;
  overflow-x: auto;
}
.dim { opacity: .55; }

/* ---------- Footer ---------- */

.footer {
  border-top: 1px solid var(--line);
  padding: 28px 6vw;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  color: var(--muted);
  font-size: 14px;
}

@media (max-width: 900px) {
  .hero { flex-direction: column; padding-top: 6vh; }
  .hero-mock { width: 100%; }
  .nav-links a:not(.btn) { display: none; }
}