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

:root {
  --color-bg: #0d0d0d;
  --color-surface: #161616;
  --color-border: #2a2a2a;
  --color-text: #e8e8e8;
  --color-muted: #888;
  --color-accent: #ff6600;
  --color-accent-hover: #ff8533;
  --font-sans: system-ui, -apple-system, sans-serif;
  --font-mono: 'Cascadia Code', 'Fira Code', monospace;
  --max-width: 1100px;
  --radius: 8px;
}

html { font-family: var(--font-sans); background: var(--color-bg); color: var(--color-text); }
body { min-height: 100vh; display: flex; flex-direction: column; }
a { color: var(--color-accent); text-decoration: none; }
a:hover { color: var(--color-accent-hover); }

/* Nav */
header { border-bottom: 1px solid var(--color-border); }
nav {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1rem 2rem;
  display: flex;
  align-items: center;
  gap: 2rem;
}
.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text);
}
.logo:hover { color: var(--color-accent-hover); }
.logo img { display: block; height: 40px; width: 40px; }
nav ul { list-style: none; display: flex; gap: 1.5rem; margin-left: auto; }
nav ul a { color: var(--color-muted); font-size: 0.95rem; }
nav ul a:hover { color: var(--color-text); }

/* Main */
main { flex: 1; }

/* Footer */
footer {
  border-top: 1px solid var(--color-border);
  padding: 2rem;
  text-align: center;
  color: var(--color-muted);
  font-size: 0.85rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

/* Shared layout helpers */
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 2rem; }
.section { padding: 5rem 0; }
.section-sm { padding: 3rem 0; }

/* Hero */
.hero { padding: 7rem 0 5rem; text-align: center; }
.hero-tagline { font-size: 0.9rem; font-weight: 600; color: var(--color-accent); letter-spacing: 0.05em; text-transform: uppercase; margin-bottom: 1.25rem; }
.hero h1 { font-size: clamp(2.5rem, 6vw, 4rem); font-weight: 800; line-height: 1.1; margin-bottom: 1.5rem; }
.hero p { font-size: 1.2rem; color: var(--color-muted); max-width: 600px; margin: 0 auto 2.5rem; line-height: 1.6; }
.hero-actions { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; }

/* Buttons */
.btn {
  display: inline-block;
  padding: 0.75rem 1.75rem;
  border-radius: var(--radius);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: opacity 0.15s;
}
.btn:hover { opacity: 0.85; color: inherit; }
.btn-primary { background: var(--color-accent); color: #fff; }
.btn-secondary { background: var(--color-surface); color: var(--color-text); border: 1px solid var(--color-border); }

/* Section headings */
.section-heading { font-size: 1.75rem; font-weight: 800; margin-bottom: 1.25rem; }
.section-subheading { color: var(--color-muted); font-size: 1.05rem; max-width: 640px; line-height: 1.6; margin-bottom: 3rem; }

/* Feature grid */
.feature-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 1.5rem; }
.feature-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.75rem;
}
.feature-card h3 { margin-bottom: 0.75rem; font-size: 1.1rem; }
.feature-card p { color: var(--color-muted); line-height: 1.6; font-size: 0.95rem; }

/* Why section */
.why-section { background: var(--color-surface); border-top: 1px solid var(--color-border); border-bottom: 1px solid var(--color-border); }
.why-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 2rem; }
.why-col h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 1.25rem; }
.why-col ul { list-style: none; display: flex; flex-direction: column; gap: 0.6rem; }
.why-col ul li { color: var(--color-muted); font-size: 0.95rem; line-height: 1.5; padding-left: 1.25rem; position: relative; }
.why-col ul li::before { content: '✓'; position: absolute; left: 0; color: var(--color-accent); font-weight: 700; }
.why-col-not ul li::before { content: '✕'; color: var(--color-muted); }

/* Page headings */
.page-header { padding: 4rem 0 2rem; border-bottom: 1px solid var(--color-border); margin-bottom: 3rem; }
.page-header h1 { font-size: 2.5rem; font-weight: 800; margin-bottom: 0.75rem; }
.page-header p { color: var(--color-muted); font-size: 1.1rem; max-width: 640px; line-height: 1.6; }

/* Download page */
.incubation-notice {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-left: 3px solid var(--color-accent);
  border-radius: var(--radius);
  padding: 2rem;
  margin-bottom: 3rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  align-items: flex-start;
}
.incubation-notice h2 { font-size: 1.2rem; font-weight: 700; margin-bottom: 0.25rem; }
.incubation-notice p { color: var(--color-muted); line-height: 1.6; font-size: 0.95rem; }
.platform-heading { font-size: 1.2rem; font-weight: 700; margin-bottom: 1.5rem; }