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

:root {
  --bg:       #F0F9FF;
  --surface:  #FFFFFF;
  --primary:  #0EA5E9;
  --dark:     #0C4A6E;
  --mid:      #0284C7;
  --dim:      #64748B;
  --border:   #BAE6FD;
}

body {
  background: var(--bg);
  color: var(--dark);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  line-height: 1.6;
  min-height: 100vh;
}

a { color: var(--mid); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ── Nav ── */
nav {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 0 32px;
  display: flex;
  align-items: center;
  height: 56px;
  gap: 24px;
}
.nav-brand {
  font-size: 17px;
  font-weight: 700;
  color: var(--dark);
  letter-spacing: -0.3px;
}
.nav-brand span { color: var(--primary); }
.nav-back {
  font-size: 13px;
  color: var(--dim);
}

/* ── Hero ── */
.hero {
  background: linear-gradient(135deg, #0C4A6E 0%, #0369A1 100%);
  color: white;
  padding: 64px 32px;
  text-align: center;
}
.hero h1 {
  font-size: clamp(32px, 6vw, 56px);
  font-weight: 800;
  letter-spacing: -1px;
  line-height: 1.1;
}
.hero p {
  font-size: 18px;
  opacity: 0.8;
  margin-top: 12px;
  max-width: 480px;
  margin-left: auto;
  margin-right: auto;
}

/* ── Main content ── */
main {
  max-width: 860px;
  margin: 0 auto;
  padding: 48px 24px 80px;
}

/* ── Project cards ── */
.projects {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 20px;
  margin-top: 40px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: box-shadow 0.15s;
}
.card:hover { box-shadow: 0 4px 20px rgba(14,165,233,0.12); }

.card-icon {
  width: 52px; height: 52px;
  border-radius: 12px;
  background: var(--primary);
  display: flex; align-items: center; justify-content: center;
}
.card-icon svg { width: 36px; height: 36px; }

.card h2 { font-size: 18px; font-weight: 700; }
.card p  { font-size: 14px; color: var(--dim); flex: 1; }

.card-links {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 4px;
}
.btn {
  display: inline-block;
  padding: 7px 16px;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 600;
  background: var(--primary);
  color: white;
}
.btn:hover { text-decoration: none; opacity: 0.9; }
.btn-ghost {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--mid);
}

/* ── App detail page ── */
.app-header {
  display: flex;
  align-items: center;
  gap: 24px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}
.app-icon-lg {
  width: 88px; height: 88px;
  border-radius: 20px;
  background: var(--primary);
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.app-icon-lg svg { width: 62px; height: 62px; }

.app-header-text h1 { font-size: 32px; font-weight: 800; }
.app-header-text p  { color: var(--dim); margin-top: 4px; }

.section { margin-top: 48px; }
.section h2 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}

.features {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 12px;
}
.feature {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px;
  font-size: 14px;
}
.feature strong { display: block; margin-bottom: 4px; color: var(--dark); }
.feature span   { color: var(--dim); }

.privacy p, .privacy li { font-size: 15px; color: #334155; margin-bottom: 10px; }
.privacy ul { padding-left: 20px; }
.privacy li { margin-bottom: 6px; }

/* ── Footer ── */
footer {
  text-align: center;
  padding: 32px;
  font-size: 13px;
  color: var(--dim);
  border-top: 1px solid var(--border);
}