/* braingia.org
   Lora (headings) + Source Sans 3 (body), Royal Blue accent */

@font-face {
  font-family: 'Lora';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('../fonts/lora-v37-latin-regular.woff2') format('woff2'),
       url('../fonts/lora-v37-latin-regular.woff') format('woff');
}

@font-face {
  font-family: 'Lora';
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url('../fonts/lora-v37-latin-700.woff2') format('woff2'),
       url('../fonts/lora-v37-latin-700.woff') format('woff');
}

@font-face {
  font-family: 'Source Sans 3';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('../fonts/source-sans-3-v19-latin-regular.woff2') format('woff2'),
       url('../fonts/source-sans-3-v19-latin-regular.woff') format('woff');
}

@font-face {
  font-family: 'Source Sans 3';
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url('../fonts/source-sans-3-v19-latin-600.woff2') format('woff2'),
       url('../fonts/source-sans-3-v19-latin-600.woff') format('woff');
}

:root {
  --color-bg: #f8f6f3;
  --color-text: #2a2a2a;
  --color-text-secondary: #6b6560;
  --color-accent: #2D59A2;
  --color-accent-dark: #122A53;
  --color-accent-light: #e8eef6;
  --color-border: #ddd8d0;
  --color-white: #ffffff;
  --font-heading: 'Lora', Georgia, serif;
  --font-body: 'Source Sans 3', 'Helvetica Neue', Helvetica, sans-serif;
  --max-width: 960px;
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 2rem;
  --space-lg: 4rem;
  --space-xl: 6rem;
}

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

html {
  font-size: 100%;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

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

a:hover {
  text-decoration: underline;
}

ul {
  list-style: none;
}

h1, h2, h3, h4 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.25;
  color: var(--color-text);
}

h1 {
  font-size: clamp(2rem, 5vw, 3rem);
  margin-bottom: var(--space-sm);
}

h2 {
  font-size: clamp(1.5rem, 3.5vw, 2rem);
  margin-bottom: var(--space-sm);
}

h3 {
  font-size: 1.25rem;
  margin-bottom: var(--space-xs);
}

h4 {
  font-size: 1.1rem;
  margin-bottom: var(--space-xs);
}

p {
  margin-bottom: var(--space-sm);
}

p:last-child {
  margin-bottom: 0;
}

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

.site-header {
  background-color: var(--color-accent-dark);
  padding: var(--space-sm) 0;
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.site-logo {
  font-family: var(--font-heading);
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--color-white);
  text-decoration: none;
  letter-spacing: 0.01em;
}

.site-logo:hover {
  text-decoration: none;
  opacity: 0.9;
}

.site-nav ul {
  display: flex;
  gap: var(--space-md);
}

.site-nav a {
  color: rgba(255, 255, 255, 0.85);
  text-decoration: none;
  font-size: 0.9375rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  padding: var(--space-xs) 0;
  transition: color 0.2s;
}

.site-nav a:hover,
.site-nav a.active {
  color: var(--color-white);
  text-decoration: none;
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-xs);
  flex-direction: column;
  gap: 5px;
}

.nav-toggle-bar {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-white);
  transition: transform 0.2s;
}

.hero {
  background-color: var(--color-accent-dark);
  color: var(--color-white);
  padding: var(--space-lg) 0 var(--space-xl);
}

.hero-inner {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.hero-text {
  flex: 1;
}

.hero h1 {
  color: var(--color-white);
  margin-bottom: var(--space-xs);
}

.hero-subtitle {
  font-family: var(--font-body);
  font-size: 1.25rem;
  font-weight: 400;
  color: rgba(255, 255, 255, 0.75);
  margin-bottom: var(--space-md);
}

.hero p {
  font-size: 1.0625rem;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.9);
}

.hero-book {
  flex-shrink: 0;
}

.hero-book img {
  width: 220px;
  border-radius: 4px;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
}

.hero-cta {
  display: inline-block;
  margin-top: var(--space-md);
  padding: 0.75rem 1.5rem;
  background-color: var(--color-accent);
  color: var(--color-white);
  font-weight: 600;
  font-size: 0.9375rem;
  border-radius: 4px;
  transition: background-color 0.2s;
}

.hero-cta:hover {
  background-color: #3a6abf;
  text-decoration: none;
}

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

.section + .section {
  border-top: 1px solid var(--color-border);
}

.section-heading {
  margin-bottom: var(--space-md);
}

.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
}

.card {
  padding: var(--space-md);
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: 4px;
}

.card h2 {
  font-size: 1.25rem;
  margin-bottom: var(--space-xs);
}

.card h2 a {
  color: var(--color-text);
}

.card h2 a:hover {
  color: var(--color-accent);
}

.card p {
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
}

.page-banner {
  background-color: var(--color-accent-dark);
  color: var(--color-white);
  padding: var(--space-md) 0;
}

.page-banner h1 {
  color: var(--color-white);
  margin-bottom: 0;
}

.page-banner p {
  color: rgba(255, 255, 255, 0.75);
  margin-top: var(--space-xs);
}

.books-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-md);
}

.book-item {
  text-align: center;
}

.book-item img {
  width: 160px;
  height: auto;
  margin: 0 auto var(--space-sm);
  border-radius: 2px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.12);
}

.book-item h3 {
  font-size: 0.9375rem;
  line-height: 1.3;
}

.book-role {
  font-size: 0.8125rem;
  color: var(--color-accent);
  font-weight: 600;
  margin-bottom: var(--space-xs);
}

.book-desc {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
}

.content-section {
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-md);
  border-bottom: 1px solid var(--color-border);
}

.content-section:last-child {
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}

.content-section h2 {
  font-size: 1.25rem;
  margin-bottom: var(--space-xs);
}

.contact-form {
  max-width: 640px;
}

.form-row {
  display: flex;
  gap: var(--space-md);
  margin-bottom: var(--space-sm);
}

.form-field {
  flex: 1;
  margin-bottom: var(--space-sm);
}

.form-field label {
  display: block;
  font-weight: 600;
  font-size: 0.9375rem;
  margin-bottom: var(--space-xs);
}

.form-field input,
.form-field textarea {
  width: 100%;
  padding: 0.625rem 0.75rem;
  font-family: var(--font-body);
  font-size: 1rem;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  background-color: var(--color-white);
  color: var(--color-text);
  transition: border-color 0.2s;
}

.form-field input:focus,
.form-field textarea:focus {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
  border-color: var(--color-accent);
}

.form-field textarea {
  resize: vertical;
  min-height: 160px;
}

.form-submit {
  display: inline-block;
  padding: 0.75rem 2rem;
  background-color: var(--color-accent);
  color: var(--color-white);
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.9375rem;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  transition: background-color 0.2s;
}

.form-submit:hover {
  background-color: #3a6abf;
}

.form-success {
  padding: var(--space-md);
  background-color: #e8f5e9;
  border: 1px solid #a5d6a7;
  border-radius: 4px;
  color: #2e7d32;
  font-weight: 600;
}

.form-error {
  padding: var(--space-md);
  background-color: #fbe9e7;
  border: 1px solid #ef9a9a;
  border-radius: 4px;
  color: #c62828;
  font-weight: 600;
}

.hp-field {
  position: absolute;
  left: -9999px;
  height: 0;
  overflow: hidden;
}

.cta-link {
  display: inline-block;
  margin-top: var(--space-sm);
  font-weight: 600;
}

.site-footer {
  background-color: var(--color-accent-dark);
  color: rgba(255, 255, 255, 0.7);
  padding: var(--space-md) 0;
  margin-top: var(--space-lg);
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-copy {
  font-size: 0.875rem;
  margin-bottom: 0;
}

.footer-nav {
  display: flex;
  gap: var(--space-sm);
}

.footer-nav a {
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.875rem;
  transition: color 0.2s;
}

.footer-nav a:hover {
  color: var(--color-white);
  text-decoration: none;
}

/* Accessibility */

.skip-nav {
  position: absolute;
  top: -100%;
  left: var(--space-md);
  background-color: var(--color-accent-dark);
  color: var(--color-white);
  padding: var(--space-xs) var(--space-sm);
  z-index: 200;
  text-decoration: none;
  font-weight: 600;
  border-radius: 0 0 4px 4px;
}

.skip-nav:focus {
  top: 0;
  outline: 2px solid var(--color-white);
  outline-offset: 2px;
}

a:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.site-header a:focus-visible,
.site-footer a:focus-visible {
  outline-color: var(--color-white);
}

button:focus-visible,
.form-submit:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.nav-toggle:focus-visible {
  outline: 2px solid var(--color-white);
  outline-offset: 2px;
}

.hero-cta:focus-visible {
  outline: 2px solid var(--color-white);
  outline-offset: 2px;
  text-decoration: none;
}

@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }

  .site-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--color-accent-dark);
    padding: var(--space-sm) var(--space-md) var(--space-md);
  }

  .site-nav.open {
    display: block;
  }

  .site-nav ul {
    flex-direction: column;
    gap: 0;
  }

  .site-nav a {
    display: block;
    padding: var(--space-xs) 0;
  }

  .hero-inner {
    flex-direction: column-reverse;
    text-align: center;
  }

  .hero-book img {
    width: 180px;
  }

  .cards {
    grid-template-columns: 1fr;
  }

  .books-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-inner {
    flex-direction: column;
    gap: var(--space-sm);
    text-align: center;
  }

  .form-row {
    flex-direction: column;
    gap: 0;
  }
}

@media (max-width: 480px) {
  .books-grid {
    grid-template-columns: 1fr;
  }
}