/* =============================
   Design Tokens
   ============================= */

:root {
  --color-primary: #89cbe1;
  --color-secondary: #cb4178;
  --color-accent: #1bcd6c;
  --color-background: #ffffff;
  --color-surface: #f5f5f5;
  --color-text: #000000;

  --font-heading: 'Merriweather', serif;
  --font-body: 'Lato', sans-serif;

  --max-width: 1100px;
  --space-sm: 0.75rem;
  --space-md: 1.5rem;
  --space-lg: 3rem;
}

/* =============================
   Reset / Base
   ============================= */

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--color-text);
  background: var(--color-background);
  line-height: 1.65;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

/* =============================
   Typography
   ============================= */

h1, h2, h3 {
  font-family: var(--font-heading);
  color: var(--color-primary);
  margin-top: 0;
}

h1 {
  font-size: 2.75rem;
}

h2 {
  font-size: 2rem;
  margin-bottom: var(--space-sm);
}

h3 {
  font-size: 1.25rem;
}

p {
  max-width: 720px;
}

a {
  color: var(--color-secondary);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

/* =============================
   Sections
   ============================= */

.section {
  padding: var(--space-lg) 0;
}

.section-measures,
.section-why,
.section-reading {
  background: var(--color-surface);
}

.section:nth-of-type(even) {
  background: var(--color-background);
}

/* =============================
   Hero
   ============================= */

.hero {
  background: linear-gradient(
    135deg,
    var(--color-primary),
    var(--color-secondary)
  );
  color: #ffffff;
  padding: calc(var(--space-lg) * 2) 0;
}

.hero h1,
.hero p {
  color: #ffffff;
}

.hero-subtitle {
  font-size: 1.1rem;
  margin-bottom: var(--space-md);
}

/* =============================
   Grid / Cards
   ============================= */

.grid {
  display: grid;
  gap: var(--space-md);
}

.grid-3 {
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.card {
  background: #ffffff;
  padding: var(--space-md);
  border-radius: 8px;
  border-left: 6px solid var(--color-primary);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

/* =============================
   Lists
   ============================= */

.value-list {
  max-width: 720px;
}

.value-list li {
  margin-bottom: 0.5rem;
}

.reading-list {
  list-style: none;
  padding-left: 0;
}

.reading-list li {
  margin-bottom: 0.75rem;
}

/* =============================
   Buttons
   ============================= */

.btn-primary {
  display: inline-block;
  background: var(--color-accent);
  color: #ffffff;
  padding: 0.75rem 1.5rem;
  border-radius: 6px;
  font-weight: 700;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 14px rgba(0, 0, 0, 0.15);
}

.btn-primary.disabled {
  background: #cccccc;
  cursor: not-allowed;
  box-shadow: none;
  transform: none;
}

/* =============================
   CTA Section
   ============================= */

.section-cta {
  text-align: center;
  background: var(--color-primary);
  color: #ffffff;
}

.section-cta h2,
.section-cta p {
  color: #ffffff;
}

/* =============================
   Footer
   ============================= */

.footer {
  background: #111111;
  color: #ffffff;
  padding: var(--space-md) 0;
}

.footer-nav a {
  color: var(--color-primary);
  margin-right: var(--space-sm);
  font-size: 0.9rem;
}

.footer-note {
  font-size: 0.85rem;
  max-width: 720px;
}

.footer-copy {
  font-size: 0.8rem;
  opacity: 0.8;
}

/* =============================
   Responsive
   ============================= */

@media (max-width: 768px) {
  h1 {
    font-size: 2.25rem;
  }
}