:root {
  --ink: #0f172a;
  --ink-2: #1e293b;
  --muted: #64748b;
  --line: #e6e8f0;
  --bg: #f8f9fd;
  --panel: #ffffff;
  --accent: #4f46e5;
  --accent-2: #7c3aed;
  --accent-soft: #eef2ff;
  --radius: 18px;
  --shadow: 0 1px 2px rgba(15, 23, 42, 0.04), 0 18px 50px rgba(15, 23, 42, 0.08);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Inter", "Microsoft YaHei", sans-serif;
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

img {
  max-width: 100%;
  display: block;
}

.wrap {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
}

/* nav */
.nav {
  position: sticky;
  top: 0;
  z-index: 30;
  background: rgba(248, 249, 253, 0.86);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}

.nav-inner {
  display: flex;
  align-items: center;
  gap: 12px;
  height: 64px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.brand img {
  width: 30px;
  height: 30px;
  border-radius: 8px;
}

.nav-links {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 20px;
  font-size: 13.5px;
  color: var(--muted);
}

.nav-links a:hover {
  color: var(--ink);
}

/* buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink-2);
  border-radius: 11px;
  padding: 11px 18px;
  font-size: 14px;
  font-weight: 700;
  transition: all 0.15s;
}

.btn:hover {
  border-color: #c7d2fe;
  transform: translateY(-1px);
  box-shadow: 0 8px 22px rgba(15, 23, 42, 0.08);
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  border-color: transparent;
  color: #fff;
  box-shadow: 0 10px 26px rgba(79, 70, 229, 0.28);
}

.btn-primary:hover {
  box-shadow: 0 14px 32px rgba(79, 70, 229, 0.36);
}

.btn-sm {
  padding: 7px 12px;
  font-size: 12.5px;
  border-radius: 9px;
}

/* hero */
.hero {
  position: relative;
  overflow: hidden;
  padding: 76px 0 64px;
}

.hero::before {
  content: "";
  position: absolute;
  inset: -30% -10% auto 40%;
  height: 700px;
  background: radial-gradient(closest-side, rgba(124, 58, 237, 0.16), transparent 70%);
  pointer-events: none;
}

.hero-grid {
  position: relative;
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 56px;
  align-items: center;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-soft);
  border: 1px solid #e0e7ff;
  border-radius: 999px;
  padding: 5px 11px;
  margin-bottom: 18px;
}

h1 {
  margin: 0 0 18px;
  font-size: 54px;
  line-height: 1.04;
  letter-spacing: -0.045em;
  font-weight: 850;
}

h1 em {
  font-style: normal;
  background: linear-gradient(100deg, var(--accent) 0%, var(--accent-2) 55%, #0891b2 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.lede {
  margin: 0 0 26px;
  font-size: 17.5px;
  line-height: 1.6;
  color: var(--muted);
  max-width: 500px;
}

.cta-row {
  display: flex;
  align-items: center;
  gap: 13px;
  flex-wrap: wrap;
}

.cta-note {
  font-size: 12.5px;
  color: var(--muted);
}

.trust {
  display: flex;
  gap: 16px;
  margin-top: 26px;
  font-size: 12.5px;
  color: var(--muted);
  flex-wrap: wrap;
}

.trust span {
  display: inline-flex;
  align-items: center;
  gap: 5px;
}

.trust svg {
  width: 14px;
  height: 14px;
  fill: none;
  stroke: #059669;
  stroke-width: 2.4;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* device */
.device {
  position: relative;
  width: 100%;
  max-width: 392px;
  margin-left: auto;
  background: #fff;
  border-radius: 20px;
  overflow: hidden;
  box-shadow:
    0 40px 90px rgba(15, 23, 42, 0.2),
    0 0 0 1px rgba(15, 23, 42, 0.06);
}

.device-bar {
  height: 36px;
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 0 13px;
  border-bottom: 1px solid var(--line);
  font-size: 11.5px;
  font-weight: 600;
  color: var(--muted);
  background: #fff;
}

.device-bar .dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.14);
}

.device-shot {
  height: 640px;
  overflow: hidden;
  position: relative;
  background: #f6f7fb;
}

.device-shot img {
  width: 100%;
}

.device-shot::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 70px;
  background: linear-gradient(to bottom, rgba(246, 247, 251, 0), #f6f7fb 88%);
}

/* sections */
.section {
  padding: 72px 0;
}

.section-head {
  max-width: 640px;
  margin-bottom: 38px;
}

.section-head h2 {
  margin: 0 0 10px;
  font-size: 34px;
  letter-spacing: -0.03em;
  line-height: 1.15;
}

.section-head p {
  margin: 0;
  color: var(--muted);
  font-size: 16px;
}

.features {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.feature {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px;
  box-shadow: 0 1px 2px rgba(15, 23, 42, 0.03);
}

.feature .ico {
  width: 38px;
  height: 38px;
  border-radius: 11px;
  background: var(--accent-soft);
  display: grid;
  place-items: center;
  margin-bottom: 13px;
}

.feature .ico svg {
  width: 18px;
  height: 18px;
  fill: none;
  stroke: var(--accent);
  stroke-width: 1.9;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.feature h3 {
  margin: 0 0 5px;
  font-size: 15px;
  letter-spacing: -0.01em;
}

.feature p {
  margin: 0;
  font-size: 13.5px;
  color: var(--muted);
  line-height: 1.55;
}

/* steps */
.steps {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  counter-reset: step;
}

.step {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px;
  position: relative;
}

.step::before {
  counter-increment: step;
  content: counter(step);
  width: 27px;
  height: 27px;
  border-radius: 9px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #fff;
  font-size: 12px;
  font-weight: 800;
  display: grid;
  place-items: center;
  margin-bottom: 12px;
}

.step h3 {
  margin: 0 0 4px;
  font-size: 15px;
}

.step p {
  margin: 0;
  font-size: 13.5px;
  color: var(--muted);
}

/* privacy band */
.band {
  background: #0b1020;
  color: #e2e8f0;
  border-radius: 24px;
  padding: 44px;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 40px;
  align-items: center;
  margin: 0 0 72px;
  overflow: hidden;
  position: relative;
}

.band::before {
  content: "";
  position: absolute;
  inset: auto -10% -60% 40%;
  height: 420px;
  background: radial-gradient(closest-side, rgba(16, 185, 129, 0.25), transparent 70%);
}

.band h2 {
  margin: 0 0 10px;
  font-size: 30px;
  letter-spacing: -0.03em;
}

.band p {
  margin: 0;
  color: #9aa8c2;
  font-size: 15px;
  max-width: 480px;
}

.band ul {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 11px;
  position: relative;
}

.band li {
  display: flex;
  gap: 9px;
  align-items: flex-start;
  font-size: 13.5px;
  color: #cbd5e1;
}

.band li b {
  color: #fff;
}

.band .tick {
  width: 19px;
  height: 19px;
  border-radius: 50%;
  background: rgba(16, 185, 129, 0.16);
  border: 1px solid rgba(16, 185, 129, 0.4);
  display: grid;
  place-items: center;
  flex: none;
  margin-top: 1px;
}

.band .tick svg {
  width: 10px;
  height: 10px;
  fill: none;
  stroke: #34d399;
  stroke-width: 2.6;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* faq */
.faq {
  max-width: 780px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

details {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 13px;
  padding: 15px 18px;
}

summary {
  cursor: pointer;
  font-weight: 700;
  font-size: 14px;
  list-style: none;
}

summary::-webkit-details-marker {
  display: none;
}

summary::after {
  content: "+";
  float: right;
  color: var(--muted);
  font-weight: 400;
}

details[open] summary::after {
  content: "–";
}

details p {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 13.5px;
  line-height: 1.6;
}

/* footer */
.footer {
  border-top: 1px solid var(--line);
  padding: 30px 0 44px;
  color: var(--muted);
  font-size: 12.5px;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.footer a {
  color: var(--muted);
  margin-left: 16px;
}

.footer a:hover {
  color: var(--accent);
}

/* privacy page */
.page {
  max-width: 820px;
  margin: 0 auto;
  padding: 48px 24px 80px;
}

.page h1 {
  font-size: 38px;
  margin-bottom: 8px;
}

.page .updated {
  color: var(--muted);
  font-size: 13px;
  margin-bottom: 28px;
}

.policy h2 {
  margin: 26px 0 8px;
  font-size: 17px;
}

.policy p,
.policy li {
  color: var(--ink-2);
  font-size: 14px;
  line-height: 1.7;
}

.policy ul {
  padding-left: 20px;
}

.policy code {
  background: var(--accent-soft);
  border: 1px solid #e0e7ff;
  border-radius: 5px;
  padding: 1px 5px;
  font-size: 12px;
  color: #3730a3;
}

@media (max-width: 900px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .device {
    margin: 0 auto;
  }
  h1 {
    font-size: 44px;
  }
  .features,
  .steps {
    grid-template-columns: 1fr;
  }
  .band {
    grid-template-columns: 1fr;
    padding: 30px;
  }
  .nav-links .hide-sm {
    display: none;
  }
}

@media (max-width: 560px) {
  h1 {
    font-size: 36px;
  }
  .section {
    padding: 50px 0;
  }
  .section-head h2 {
    font-size: 27px;
  }
}