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

:root {
  --teal: #1db5a6;
  --teal-dark: #159688;
  --teal-light: #e6f7f5;
  --navy: #1a3a5c;
  --navy-light: #2c5282;
  --text: #2d3748;
  --text-muted: #64748b;
  --bg: #f8fafb;
  --white: #ffffff;
  --border: #e2e8f0;
  --shadow: 0 4px 24px rgba(26, 58, 92, 0.08);
  --radius: 12px;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.page {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.header {
  padding: 2rem 1.5rem 1rem;
  text-align: center;
}

.logo {
  max-width: 200px;
  height: auto;
}

.main {
  flex: 1;
  max-width: 640px;
  margin: 0 auto;
  padding: 0 1.5rem 3rem;
  width: 100%;
}

.hero {
  text-align: center;
  padding: 1.5rem 0 2.5rem;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: var(--teal-light);
  color: var(--teal-dark);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 0.35rem 0.85rem;
  border-radius: 999px;
  margin-bottom: 1.25rem;
}

.badge-icon {
  width: 0.875rem;
  height: 0.875rem;
  flex-shrink: 0;
}

.hero h1 {
  font-size: clamp(1.75rem, 5vw, 2.25rem);
  font-weight: 700;
  color: var(--navy);
  line-height: 1.2;
  margin-bottom: 0.5rem;
}

.tagline {
  font-size: 1.125rem;
  font-weight: 500;
  color: var(--teal);
  margin-bottom: 1rem;
}

.description {
  color: var(--text-muted);
  font-size: 1rem;
  max-width: 480px;
  margin: 0 auto 2rem;
}

.download-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  background: linear-gradient(135deg, var(--teal) 0%, var(--teal-dark) 100%);
  color: var(--white);
  font-size: 1.0625rem;
  font-weight: 600;
  text-decoration: none;
  padding: 1rem 2rem;
  border-radius: var(--radius);
  box-shadow: 0 4px 16px rgba(29, 181, 166, 0.35);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
  width: 100%;
  max-width: 340px;
}

.download-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(29, 181, 166, 0.45);
}

.download-btn:active {
  transform: translateY(0);
}

.icon {
  width: 1.25rem;
  height: 1.25rem;
  flex-shrink: 0;
}

.file-info {
  margin-top: 0.85rem;
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.features,
.install {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
  margin-bottom: 1.25rem;
  box-shadow: var(--shadow);
}

.features h2,
.install h2 {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--navy);
  margin-bottom: 1.25rem;
}

.feature-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.feature-list li {
  display: flex;
  align-items: flex-start;
  gap: 0.85rem;
}

.feature-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.25rem;
  height: 2.25rem;
  background: var(--teal-light);
  color: var(--teal-dark);
  border-radius: 8px;
  flex-shrink: 0;
}

.feature-icon svg {
  width: 1.125rem;
  height: 1.125rem;
}

.feature-list strong {
  display: block;
  font-size: 0.9375rem;
  color: var(--navy);
  margin-bottom: 0.15rem;
}

.feature-list span {
  font-size: 0.875rem;
  color: var(--text-muted);
}

.steps {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.steps li {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
}

.step-num {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  background: var(--teal-light);
  color: var(--teal-dark);
  font-size: 0.875rem;
  font-weight: 700;
  border-radius: 50%;
  flex-shrink: 0;
}

.steps strong {
  display: block;
  font-size: 0.9375rem;
  color: var(--navy);
  margin-bottom: 0.2rem;
}

.steps p {
  font-size: 0.875rem;
  color: var(--text-muted);
}

.notice {
  background: var(--teal-light);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  font-size: 0.875rem;
  color: var(--navy-light);
  line-height: 1.55;
}

.notice a {
  color: var(--teal-dark);
  font-weight: 500;
}

.footer {
  text-align: center;
  padding: 2rem 1.5rem;
  border-top: 1px solid var(--border);
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.footer p + p {
  margin-top: 0.35rem;
}

.footer a {
  color: var(--teal-dark);
  text-decoration: none;
}

.footer a:hover {
  text-decoration: underline;
}

@media (min-width: 480px) {
  .download-btn {
    width: auto;
  }
}