:root {
  --bg: #f4f7fb;
  --surface: #ffffff;
  --text: #162033;
  --muted: #5a687f;
  --primary: #1f6feb;
  --primary-hover: #1a5fca;
  --border: #dbe3ef;
  --shadow: 0 10px 28px rgba(24, 46, 84, 0.12);
  --radius: 14px;
  --max-width: 1080px;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  min-height: 100%;
}

body {
  font-family: "Segoe UI", -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 8% 0%, #eef5ff 0%, transparent 45%),
    radial-gradient(circle at 92% 20%, #edf7f5 0%, transparent 38%),
    var(--bg);
  line-height: 1.6;
}

body.has-open-app-panel {
  padding-top: 74px;
}

.open-app-panel {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 10px 12px;
  background: #f0f7ff;
  border-bottom: 1px solid #d5e4fb;
}

.open-app-inner {
  width: min(100%, var(--max-width));
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.open-app-hint {
  margin: 0;
  color: #204471;
  font-weight: 600;
}

.app-shell {
  min-height: 100vh;
  display: grid;
  grid-template-rows: auto 1fr auto;
}

.topbar {
  width: min(100%, var(--max-width));
  margin: 0 auto;
  padding: 12px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  text-decoration: none;
  font-weight: 700;
  letter-spacing: 0.2px;
}

.brand-icon {
  width: 32px;
  height: 32px;
  border-radius: 10px;
  box-shadow: 0 6px 18px rgba(31, 111, 235, 0.25);
}

.nav {
  display: inline-flex;
  gap: 8px;
}

.nav a {
  text-decoration: none;
  color: var(--muted);
  font-weight: 600;
  border-radius: 10px;
  padding: 8px 12px;
  transition: background-color 0.15s ease, color 0.15s ease;
}

.nav a:hover,
.nav a[aria-current="page"] {
  background: #e9f1ff;
  color: var(--primary);
}

.main {
  width: min(100%, var(--max-width));
  margin: 0 auto;
  padding: 12px 16px 28px;
}

.hero {
  min-height: calc(100vh - 180px);
  display: grid;
  place-items: center;
}

.hero-card {
  width: min(720px, 100%);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 22px;
  box-shadow: var(--shadow);
  padding: 26px 20px;
  text-align: center;
}

.hero-icon {
  width: 96px;
  height: 96px;
  border-radius: 22px;
  box-shadow: 0 14px 30px rgba(24, 46, 84, 0.2);
  margin: 0 auto 14px;
  cursor: pointer;
  transition: transform 0.16s ease;
}

.hero-icon:hover {
  transform: translateY(-2px);
}

.hero h1 {
  margin: 0;
  font-size: clamp(1.7rem, 5vw, 2.5rem);
  line-height: 1.2;
}

.tagline {
  margin: 6px 0 0;
  color: var(--muted);
  font-weight: 600;
}

.description {
  margin: 16px auto 0;
  max-width: 58ch;
  color: #2a3a54;
}

.cta-wrap {
  margin-top: 20px;
  display: grid;
  gap: 12px;
  justify-items: center;
}

.button {
  border: 0;
  border-radius: 12px;
  padding: 11px 17px;
  font-size: 0.96rem;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.15s ease, background-color 0.15s ease;
}

.button:hover {
  transform: translateY(-1px);
}

.button-primary {
  color: #ffffff;
  background: var(--primary);
}

.button-primary:hover {
  background: var(--primary-hover);
}

.unsupported-panel {
  display: none;
  max-width: 58ch;
  padding: 12px;
  border-radius: 12px;
  border: 1px solid #ecd6d6;
  background: #fff7f7;
  color: #6f2c2c;
  font-weight: 600;
}

.unsupported-panel.visible {
  display: block;
}

.page {
  width: min(760px, 100%);
  margin: 0 auto;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: var(--shadow);
  padding: 22px 18px;
}

.page h1 {
  margin: 0 0 8px;
  font-size: clamp(1.5rem, 4.5vw, 2.1rem);
}

.page p {
  margin: 8px 0;
  color: #2b3a51;
}

.email-link {
  color: var(--primary);
  font-weight: 700;
  text-decoration: none;
}

.faq,
.privacy-sections {
  margin-top: 16px;
  display: grid;
  gap: 12px;
}

.faq-item,
.privacy-item {
  background: #f7faff;
  border: 1px solid #dce7f8;
  border-radius: 12px;
  padding: 12px;
}

.faq-item h3,
.privacy-item h2 {
  margin: 0 0 6px;
  font-size: 1rem;
}

.footer {
  width: min(100%, var(--max-width));
  margin: 0 auto;
  padding: 14px 16px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  font-size: 0.95rem;
}

.footer-links {
  display: inline-flex;
  gap: 12px;
}

.footer a {
  color: var(--muted);
  text-decoration: none;
  font-weight: 600;
}

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

@media (min-width: 768px) {
  .topbar {
    padding-top: 18px;
  }

  .hero-card {
    padding: 34px 34px;
  }

  .hero-icon {
    width: 112px;
    height: 112px;
  }

  .page {
    padding: 28px 28px;
  }
}

@media (max-width: 640px) {
  .open-app-inner {
    flex-direction: column;
    align-items: stretch;
  }

  .topbar {
    flex-direction: column;
    align-items: flex-start;
  }

  .footer {
    flex-direction: column;
    align-items: flex-start;
  }
}