:root {
  color-scheme: light;
  --ink: #111418;
  --muted: #66717c;
  --paper: #f5f7f8;
  --panel: #ffffff;
  --line: #dce4e8;
  --red: #d83b35;
  --green: #0f9b6e;
  --blue: #235bd8;
  --gold: #b37a16;
  --charcoal: #111820;
  --shadow: 0 20px 56px rgba(17, 20, 24, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Microsoft YaHei", "PingFang SC", "Segoe UI", Arial, sans-serif;
  color: var(--ink);
  background: var(--paper);
  letter-spacing: 0;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 20;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 28px;
  min-height: 72px;
  padding: 0 42px;
  color: #f8fbfa;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.site-header.is-solid {
  color: var(--ink);
  background: rgba(245, 247, 248, 0.94);
  border-bottom: 1px solid rgba(126, 143, 156, 0.22);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 18px;
  font-weight: 900;
  white-space: nowrap;
}

.brand-icon {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  object-fit: cover;
  box-shadow: 0 12px 26px rgba(0, 0, 0, 0.18);
}

.site-nav {
  display: flex;
  justify-content: center;
  gap: 32px;
  font-size: 14px;
  font-weight: 700;
}

.site-nav a {
  opacity: 0.78;
}

.site-nav a:hover,
.site-nav a:focus-visible {
  opacity: 1;
}

.header-download {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 124px;
  height: 40px;
  padding: 0 18px;
  border-radius: 8px;
  background: #ffffff;
  color: var(--ink);
  font-size: 14px;
  font-weight: 800;
  box-shadow: 0 14px 34px rgba(0, 0, 0, 0.16);
}

.site-header.is-solid .header-download {
  background: var(--ink);
  color: #ffffff;
  box-shadow: none;
}

[aria-disabled="true"] {
  cursor: wait;
}

.hero {
  min-height: 84svh;
  display: flex;
  align-items: center;
  padding: 110px 42px 72px;
  color: #f7fbf9;
  background:
    linear-gradient(90deg, rgba(8, 13, 15, 0.93) 0%, rgba(8, 13, 15, 0.82) 44%, rgba(8, 13, 15, 0.18) 100%),
    url("assets/secretly-monitor-preview.png") center / cover no-repeat;
}

.hero-inner {
  width: min(760px, 100%);
  margin-left: max(0px, calc((100vw - 1180px) / 2));
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--green);
  font-size: 13px;
  font-weight: 900;
  text-transform: uppercase;
}

.hero h1 {
  max-width: 760px;
  margin: 0;
  font-size: 68px;
  line-height: 1.04;
  font-weight: 900;
  overflow-wrap: anywhere;
  word-break: break-word;
}

.hero h1 span {
  display: block;
}

.hero-copy {
  max-width: 680px;
  margin: 26px 0 0;
  color: rgba(248, 251, 250, 0.84);
  font-size: 19px;
  line-height: 1.78;
}

.hero-actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 34px;
}

.download-button {
  display: inline-flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  min-width: 230px;
  min-height: 64px;
  padding: 10px 24px;
  border-radius: 8px;
  background: var(--red);
  color: #ffffff;
  box-shadow: 0 18px 36px rgba(216, 59, 53, 0.32);
}

.download-button:hover,
.download-button:focus-visible {
  background: #b92f2a;
}

.download-button span {
  font-size: 18px;
  line-height: 1.2;
  font-weight: 900;
}

.download-button small {
  margin-top: 5px;
  color: rgba(255, 255, 255, 0.82);
  font-size: 12px;
}

.download-button.large {
  width: 100%;
  min-height: 72px;
}

.secondary-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 136px;
  height: 50px;
  padding: 0 18px;
  border: 1px solid rgba(255, 255, 255, 0.4);
  border-radius: 8px;
  color: #ffffff;
  font-weight: 800;
}

.secondary-link:hover,
.secondary-link:focus-visible {
  background: rgba(255, 255, 255, 0.1);
}

.hero-proof {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 22px;
  max-width: 700px;
  margin: 42px 0 0;
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.24);
}

.hero-proof dt {
  color: #ffffff;
  font-size: 30px;
  font-weight: 900;
}

.hero-proof dd {
  margin: 6px 0 0;
  color: rgba(248, 251, 250, 0.66);
  font-size: 13px;
}

.pain-strip {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border-block: 1px solid var(--line);
}

.pain-strip div {
  min-height: 118px;
  padding: 30px 42px;
  background: #ffffff;
}

.pain-strip span {
  display: block;
  color: var(--gold);
  font-size: 13px;
  font-weight: 900;
}

.pain-strip strong {
  display: block;
  margin-top: 10px;
  font-size: 18px;
  line-height: 1.45;
}

.section {
  padding: 92px 42px;
}

.section-heading,
.how-copy,
.download-copy {
  width: min(780px, 100%);
  margin: 0 auto 44px;
  text-align: center;
}

.section-heading.compact {
  margin-bottom: 30px;
}

.section-heading h2,
.how-copy h2,
.download-copy h2 {
  margin: 0;
  font-size: 42px;
  line-height: 1.18;
}

.section-heading p:not(.eyebrow),
.how-copy p:not(.eyebrow),
.download-copy p:not(.eyebrow) {
  margin: 18px 0 0;
  color: var(--muted);
  font-size: 17px;
  line-height: 1.8;
}

.highlight-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  width: min(1180px, 100%);
  margin: 0 auto;
}

.highlight-card,
.mode-panel,
.download-card {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  box-shadow: 0 10px 30px rgba(17, 24, 32, 0.05);
}

.highlight-card {
  min-height: 240px;
  padding: 28px;
}

.highlight-card.primary-card {
  background: var(--charcoal);
  color: #ffffff;
  border-color: var(--charcoal);
}

.highlight-card span {
  color: var(--blue);
  font-size: 13px;
  font-weight: 900;
}

.highlight-card.primary-card span {
  color: #7bd6a7;
}

.highlight-card h3 {
  margin: 28px 0 12px;
  font-size: 24px;
}

.highlight-card p {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.75;
}

.highlight-card.primary-card p {
  color: rgba(255, 255, 255, 0.72);
}

.modes-section {
  background: #ffffff;
}

.mode-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  width: min(1040px, 100%);
  margin: 0 auto;
}

.mode-panel {
  min-height: 360px;
  padding: 34px;
}

.watch-panel {
  border-top: 5px solid var(--green);
}

.full-panel {
  border-top: 5px solid var(--red);
}

.mode-label {
  color: var(--blue);
  font-size: 13px;
  font-weight: 900;
  text-transform: uppercase;
}

.mode-panel h3 {
  margin: 28px 0 14px;
  font-size: 30px;
}

.mode-panel p,
.mode-panel li {
  color: var(--muted);
  font-size: 16px;
  line-height: 1.75;
}

.mode-panel ul {
  display: grid;
  gap: 9px;
  margin: 22px 0 0;
  padding-left: 18px;
}

.how-section {
  padding: 92px 42px;
  color: #f6fbf8;
  background: var(--charcoal);
}

.how-copy p:not(.eyebrow) {
  color: rgba(246, 251, 248, 0.7);
}

.steps {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
  width: min(1180px, 100%);
  margin: 0 auto;
  padding: 0;
  list-style: none;
}

.steps li {
  min-height: 210px;
  padding: 24px;
  border: 1px solid rgba(255, 255, 255, 0.13);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.045);
}

.steps span {
  color: #8fd8b0;
  font-size: 13px;
  font-weight: 900;
}

.steps strong {
  display: block;
  margin-top: 24px;
  font-size: 22px;
}

.steps p {
  margin: 12px 0 0;
  color: rgba(246, 251, 248, 0.68);
  line-height: 1.7;
}

.download-section {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 420px;
  gap: 54px;
  align-items: center;
  width: min(1180px, calc(100% - 84px));
  margin: 0 auto;
  padding: 98px 0;
}

.download-copy {
  margin: 0;
  text-align: left;
}

.download-note {
  margin-top: 22px;
  padding: 16px 18px;
  border-left: 4px solid var(--gold);
  background: #fff7e8;
  color: #5f4a20;
  line-height: 1.7;
}

.download-card {
  padding: 28px;
  box-shadow: var(--shadow);
}

.package-label {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 0 10px;
  border-radius: 999px;
  background: rgba(15, 155, 110, 0.12);
  color: var(--green);
  font-size: 12px;
  font-weight: 900;
}

.download-card h3 {
  margin: 18px 0 8px;
  font-size: 28px;
}

.download-card p {
  margin: 0 0 24px;
  color: var(--muted);
  line-height: 1.7;
}

.package-meta {
  display: grid;
  gap: 10px;
  margin: 22px 0 0;
  padding: 0;
  color: var(--muted);
  font-size: 14px;
  list-style: none;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 28px 42px;
  border-top: 1px solid var(--line);
  background: #ffffff;
  color: var(--muted);
  font-size: 14px;
}

@media (max-width: 980px) {
  .site-header {
    grid-template-columns: auto auto;
    justify-content: space-between;
    gap: 12px;
    min-height: 68px;
    padding: 14px 22px;
    width: 100%;
    max-width: 100vw;
  }

  .site-nav {
    display: none;
  }

  .hero {
    min-height: 82svh;
    padding: 104px 24px 58px;
  }

  .hero-inner {
    margin-left: 0;
  }

  .hero h1 {
    font-size: 50px;
  }

  .hero-copy {
    font-size: 17px;
  }

  .pain-strip,
  .highlight-grid,
  .mode-grid,
  .steps,
  .download-section {
    grid-template-columns: 1fr;
  }

  .download-section {
    width: min(100% - 48px, 720px);
  }
}

@media (max-width: 620px) {
  .site-header {
    padding: 12px 16px;
  }

  .brand {
    font-size: 16px;
  }

  .header-download {
    display: none;
  }

  .hero {
    padding: 96px 18px 48px;
  }

  .hero-inner {
    width: calc(100vw - 36px);
    max-width: calc(100vw - 36px);
  }

  .hero h1 {
    max-width: 330px;
    font-size: 30px;
    line-height: 1.16;
  }

  .hero-copy {
    max-width: 330px;
    font-size: 16px;
  }

  .hero-proof {
    grid-template-columns: 1fr;
  }

  .download-button,
  .secondary-link {
    width: min(100%, 330px);
  }

  .pain-strip div,
  .section,
  .how-section {
    padding-inline: 20px;
  }

  .section-heading h2,
  .how-copy h2,
  .download-copy h2 {
    font-size: 31px;
  }

  .highlight-card,
  .mode-panel,
  .steps li,
  .download-card {
    padding: 22px;
  }

  .site-footer {
    flex-direction: column;
    padding: 24px 20px;
  }
}