/* Life-Link.app marketing site - professional, clean, mobile-first */

:root {
  --color-bg: #f8fafc;
  --color-bg-alt: #ffffff;
  --color-text: #1e293b;
  --color-text-muted: #64748b;
  --color-accent: #0ea5e9;
  --color-accent-dark: #0284c7;
  --color-border: #e2e8f0;
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  --font-heading: var(--font-sans);
  --max-width: 720px;
  --spacing: 1.5rem;
  --spacing-lg: 3rem;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 1.0625rem;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
}

/* Header */
.site-header {
  background: var(--color-bg-alt);
  border-bottom: 1px solid var(--color-border);
  padding: var(--spacing) var(--spacing);
  position: sticky;
  top: 0;
  z-index: 10;
}

.site-header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing);
}

.site-logo {
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--color-text);
  text-decoration: none;
}

.site-nav a {
  color: var(--color-accent);
  text-decoration: none;
  font-weight: 500;
}

.site-nav a:hover {
  text-decoration: underline;
  color: var(--color-accent-dark);
}

/* Main content wrapper */
main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--spacing-lg) var(--spacing);
}

section {
  margin-bottom: var(--spacing-lg);
}

section:last-of-type {
  margin-bottom: 0;
}

.alt-bg {
  background: var(--color-bg-alt);
  margin-left: calc(-1 * var(--spacing));
  margin-right: calc(-1 * var(--spacing));
  padding: var(--spacing-lg) var(--spacing);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

/* Typography */
h1 {
  font-family: var(--font-heading);
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  font-weight: 700;
  line-height: 1.2;
  margin: 0 0 0.75rem;
  color: var(--color-text);
}

h2 {
  font-size: 1.35rem;
  font-weight: 600;
  margin: 0 0 1rem;
  color: var(--color-text);
}

h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin: 1.5rem 0 0.5rem;
  color: var(--color-text);
}

p {
  margin: 0 0 1rem;
  color: var(--color-text);
}

p.lead {
  font-size: 1.15rem;
  color: var(--color-text-muted);
}

ul {
  margin: 0 0 1rem;
  padding-left: 1.5rem;
}

li {
  margin-bottom: 0.5rem;
}

/* Hero */
.hero {
  text-align: center;
  padding: var(--spacing-lg) 0;
}

.hero .lead {
  margin-bottom: 1.5rem;
}

.cta {
  display: inline-block;
  background: var(--color-accent);
  color: #fff !important;
  padding: 0.75rem 1.5rem;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 600;
  margin-top: 0.5rem;
}

.cta:hover {
  background: var(--color-accent-dark);
  text-decoration: none;
}

.cta-secondary {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 600;
  margin-top: 0.5rem;
  border: 2px solid var(--color-accent);
  color: var(--color-accent);
  background: transparent;
}

.cta-secondary:hover {
  background: var(--color-accent);
  color: #fff;
  text-decoration: none;
}

/* Developer statement */
.developer-statement {
  font-style: italic;
  color: var(--color-text-muted);
  border-left: 4px solid var(--color-accent);
  padding-left: 1rem;
  margin: 1rem 0;
}

.crap-note {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  margin-top: 1rem;
}

/* Feature grid */
.feature-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.feature-list li {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  margin-bottom: 1rem;
  padding: 1rem;
  background: var(--color-bg);
  border-radius: 8px;
  border: 1px solid var(--color-border);
}

.feature-list li::before {
  content: "✓";
  color: var(--color-accent);
  font-weight: 700;
  flex-shrink: 0;
}

/* How it works - steps */
.steps {
  list-style: none;
  padding: 0;
  margin: 0;
  counter-reset: step;
}

.steps li {
  counter-increment: step;
  position: relative;
  padding-left: 3rem;
  margin-bottom: 1.5rem;
}

.steps li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: 0;
  width: 2rem;
  height: 2rem;
  background: var(--color-accent);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.9rem;
}

/* Screenshots placeholder */
.screenshots {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: var(--spacing);
  margin-top: 1rem;
}

.screenshot-placeholder {
  aspect-ratio: 9/19;
  background: var(--color-border);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  font-size: 0.85rem;
  text-align: center;
  padding: 1rem;
}

/* Security badges / short list */
.security-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.security-list li {
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--color-border);
  margin: 0;
}

.security-list li:last-child {
  border-bottom: none;
}

/* Footer */
.site-footer {
  margin-top: var(--spacing-lg);
  padding: var(--spacing-lg) var(--spacing);
  border-top: 1px solid var(--color-border);
  background: var(--color-bg-alt);
  text-align: center;
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

.site-footer a {
  color: var(--color-accent);
  text-decoration: none;
}

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

.site-footer p {
  margin: 0.25rem 0;
}

/* Manual page */
.manual-nav {
  margin: 1.5rem 0;
  padding: 1rem;
  background: var(--color-bg);
  border-radius: 8px;
  border: 1px solid var(--color-border);
}

.manual-nav ul {
  margin: 0;
  padding-left: 1.25rem;
}

.manual-nav li {
  margin-bottom: 0.35rem;
}

.manual-nav a {
  color: var(--color-accent);
  text-decoration: none;
}

.manual-nav a:hover {
  text-decoration: underline;
}

.manual-section {
  margin-bottom: 2rem;
}

.manual-section h2 {
  padding-top: 0.5rem;
  border-top: 1px solid var(--color-border);
  margin-top: 2rem;
}

.manual-section:first-child h2 {
  border-top: none;
  margin-top: 0;
  padding-top: 0;
}

/* Back link */
.back-link {
  display: inline-block;
  margin-bottom: 1rem;
  color: var(--color-accent);
  text-decoration: none;
  font-weight: 500;
}

.back-link:hover {
  text-decoration: underline;
}