/* ============================================
   BOTTOR LEARNING FOUNDATION — Main Stylesheet
   ============================================ */

/* ---------- CSS Variables / Brand Colors ---------- */
:root {
  --blue: #2B6CB0;
  --blue-dark: #1E4E8C;
  --blue-light: #EBF4FF;
  --green: #38A169;
  --green-dark: #276749;
  --green-light: #F0FFF4;
  --orange: #ED8936;
  --orange-dark: #C05621;
  --orange-light: #FFFAF0;
  --white: #FFFFFF;
  --off-white: #F7FAFC;
  --gray-50: #F9FAFB;
  --gray-100: #EDF2F7;
  --gray-200: #E2E8F0;
  --gray-300: #CBD5E0;
  --gray-600: #718096;
  --gray-700: #4A5568;
  --gray-800: #2D3748;
  --gray-900: #1A202C;
  --radius: 8px;
  --radius-lg: 12px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.12);
  --font-sans: 'Segoe UI', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  --max-width: 1140px;
}

/* ---------- Reset & Base ---------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-sans);
  color: var(--gray-800);
  line-height: 1.7;
  background: var(--white);
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--blue);
  text-decoration: none;
  transition: color 0.2s;
}

a:hover {
  color: var(--blue-dark);
}

ul {
  list-style: none;
}

/* ---------- Typography ---------- */
h1, h2, h3, h4 {
  line-height: 1.3;
  color: var(--gray-900);
}

h1 {
  font-size: 2.5rem;
  font-weight: 700;
}

h2 {
  font-size: 2rem;
  font-weight: 700;
}

h3 {
  font-size: 1.35rem;
  font-weight: 600;
}

p {
  margin-bottom: 1rem;
}

/* ---------- Layout Utilities ---------- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 80px 0;
}

.section-sm {
  padding: 48px 0;
}

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

.section-header {
  max-width: 700px;
  margin: 0 auto 48px;
  text-align: center;
}

.section-header h2 {
  margin-bottom: 16px;
}

.section-header p {
  font-size: 1.1rem;
  color: var(--gray-600);
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-block;
  padding: 14px 32px;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius);
  border: none;
  cursor: pointer;
  transition: background 0.2s, transform 0.15s, box-shadow 0.2s;
  text-align: center;
  line-height: 1.4;
}

.btn:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn:active {
  transform: translateY(0);
}

.btn-primary {
  background: var(--orange);
  color: var(--white);
}

.btn-primary:hover {
  background: var(--orange-dark);
  color: var(--white);
}

.btn-secondary {
  background: var(--white);
  color: var(--blue);
  border: 2px solid var(--blue);
}

.btn-secondary:hover {
  background: var(--blue);
  color: var(--white);
}

.btn-donate {
  background: var(--green);
  color: var(--white);
}

.btn-donate:hover {
  background: var(--green-dark);
  color: var(--white);
}

.btn-lg {
  padding: 16px 40px;
  font-size: 1.1rem;
}

/* ---------- Header / Navigation ---------- */
.site-header {
  background: var(--white);
  border-bottom: 1px solid var(--gray-200);
  position: sticky;
  top: 0;
  z-index: 1000;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 24px;
  max-width: var(--max-width);
  margin: 0 auto;
}

.header-logo {
  display: flex;
  align-items: center;
  gap: 12px;
}

.header-logo img {
  height: 65px;
  min-height: 65px;
  width: auto;
  max-width: none;
}

.header-logo span {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--gray-900);
  line-height: 1.2;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-links a {
  color: var(--gray-700);
  font-weight: 500;
  font-size: 0.95rem;
  transition: color 0.2s;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--blue);
}

.nav-donate {
  margin-left: 4px;
}

.nav-donate .btn {
  padding: 10px 24px;
  font-size: 0.95rem;
}

/* Mobile menu toggle */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--gray-800);
  margin: 6px 0;
  transition: transform 0.3s, opacity 0.3s;
  border-radius: 2px;
}

/* ---------- Hero Section ---------- */
.hero {
  background: linear-gradient(135deg, var(--blue-light) 0%, var(--white) 50%, var(--green-light) 100%);
  padding: 80px 0 96px;
  text-align: center;
}

.hero-logo {
  width: 280px;
  height: auto;
  max-width: none;
  margin: 0 auto 24px;
}

.hero h1 {
  font-size: 2.75rem;
  margin-bottom: 8px;
  color: var(--blue-dark);
}

.hero .tagline {
  font-size: 1.3rem;
  color: var(--green);
  font-weight: 600;
  margin-bottom: 24px;
}

.hero .hero-text {
  font-size: 1.15rem;
  color: var(--gray-700);
  max-width: 640px;
  margin: 0 auto 36px;
  line-height: 1.8;
}

.hero-buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ---------- Card Grid ---------- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 28px;
}

.card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  transition: box-shadow 0.2s, transform 0.2s;
}

.card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.card-icon {
  font-size: 2.2rem;
  margin-bottom: 16px;
  display: block;
}

.card h3 {
  margin-bottom: 12px;
  color: var(--gray-900);
}

.card p {
  color: var(--gray-600);
  font-size: 0.95rem;
  margin-bottom: 0;
}

/* ---------- Alternating Content Sections ---------- */
.content-block {
  display: flex;
  align-items: center;
  gap: 60px;
}

.content-block.reverse {
  flex-direction: row-reverse;
}

.content-block-text {
  flex: 1;
}

.content-block-visual {
  flex: 1;
  background: var(--blue-light);
  border-radius: var(--radius-lg);
  min-height: 280px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px;
}

.content-block-visual.green {
  background: var(--green-light);
}

.content-block-visual.orange {
  background: var(--orange-light);
}

/* ---------- Stats / Impact ---------- */
.impact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 32px;
  text-align: center;
}

.impact-item h3 {
  font-size: 2.5rem;
  color: var(--blue);
  margin-bottom: 8px;
}

.impact-item p {
  color: var(--gray-600);
  font-weight: 500;
}

/* ---------- CTA Banner ---------- */
.cta-banner {
  background: linear-gradient(135deg, var(--blue) 0%, var(--blue-dark) 100%);
  color: var(--white);
  text-align: center;
  padding: 72px 24px;
  border-radius: 0;
}

.cta-banner h2 {
  color: var(--white);
  margin-bottom: 16px;
  font-size: 2rem;
}

.cta-banner p {
  color: rgba(255,255,255,0.9);
  font-size: 1.1rem;
  max-width: 600px;
  margin: 0 auto 32px;
}

.cta-banner .btn-donate {
  font-size: 1.1rem;
  padding: 16px 40px;
}

/* ---------- Literacy Facts Section ---------- */
.literacy-facts {
  background: var(--off-white);
}

.fact-list {
  max-width: 720px;
  margin: 0 auto;
}

.fact-item {
  display: flex;
  gap: 16px;
  margin-bottom: 24px;
  align-items: flex-start;
}

.fact-icon {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  background: var(--blue);
  color: var(--white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.1rem;
  margin-top: 2px;
}

.fact-item p {
  margin-bottom: 0;
  font-size: 1.05rem;
}

/* ---------- Page Header (Inner Pages) ---------- */
.page-header {
  background: linear-gradient(135deg, var(--blue-light) 0%, var(--white) 100%);
  padding: 56px 0 48px;
  text-align: center;
  border-bottom: 1px solid var(--gray-200);
}

.page-header h1 {
  color: var(--blue-dark);
  margin-bottom: 12px;
}

.page-header p {
  color: var(--gray-600);
  font-size: 1.1rem;
  max-width: 560px;
  margin: 0 auto;
}

/* ---------- About Page ---------- */
.about-content {
  max-width: 760px;
  margin: 0 auto;
}

.about-content h2 {
  margin-top: 40px;
  margin-bottom: 16px;
  color: var(--blue-dark);
}

.about-content p {
  font-size: 1.05rem;
  color: var(--gray-700);
}

.values-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 24px;
  margin-top: 32px;
}

.value-item {
  text-align: center;
  padding: 28px 20px;
  background: var(--off-white);
  border-radius: var(--radius-lg);
}

.value-item .card-icon {
  margin-bottom: 12px;
}

.value-item h3 {
  margin-bottom: 8px;
  font-size: 1.15rem;
}

.value-item p {
  font-size: 0.93rem;
  color: var(--gray-600);
  margin-bottom: 0;
}

/* ---------- Donate Page ---------- */
.donate-hero {
  background: linear-gradient(135deg, var(--green-light) 0%, var(--white) 50%, var(--orange-light) 100%);
  padding: 64px 0;
  text-align: center;
}

.donate-hero h1 {
  color: var(--green-dark);
}

.donate-ways {
  max-width: 760px;
  margin: 0 auto;
}

.donate-ways h3 {
  margin-bottom: 12px;
}

.donate-impact-list {
  padding-left: 0;
}

.donate-impact-list li {
  padding: 10px 0;
  padding-left: 28px;
  position: relative;
  font-size: 1.05rem;
  color: var(--gray-700);
}

.donate-impact-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--green);
  font-weight: 700;
}

.faq-section {
  max-width: 720px;
  margin: 0 auto;
}

.faq-item {
  border-bottom: 1px solid var(--gray-200);
  padding: 24px 0;
}

.faq-item h3 {
  color: var(--blue-dark);
  margin-bottom: 8px;
  font-size: 1.15rem;
}

.faq-item p {
  color: var(--gray-600);
  margin-bottom: 0;
}

/* ---------- Contact Page ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}

.contact-form label {
  display: block;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--gray-800);
  font-size: 0.95rem;
}

.contact-form input,
.contact-form textarea,
.contact-form select {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--gray-300);
  border-radius: var(--radius);
  font-size: 1rem;
  font-family: var(--font-sans);
  margin-bottom: 20px;
  transition: border-color 0.2s;
  background: var(--white);
}

.contact-form input:focus,
.contact-form textarea:focus,
.contact-form select:focus {
  outline: none;
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(43, 108, 176, 0.1);
}

.contact-form textarea {
  min-height: 140px;
  resize: vertical;
}

.contact-info-block {
  margin-bottom: 28px;
}

.contact-info-block h3 {
  margin-bottom: 8px;
  color: var(--blue-dark);
}

.contact-info-block p {
  color: var(--gray-600);
}

.contact-info-block a {
  color: var(--blue);
  font-weight: 500;
}

/* ---------- Footer ---------- */
.site-footer {
  background: var(--gray-900);
  color: rgba(255,255,255,0.75);
  padding: 56px 0 32px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-brand p {
  font-size: 0.93rem;
  line-height: 1.7;
  margin-top: 12px;
}

.footer-brand img {
  height: 40px;
  margin-bottom: 4px;
}

.site-footer h4 {
  color: var(--white);
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 16px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.site-footer ul li {
  margin-bottom: 10px;
}

.site-footer ul li a {
  color: rgba(255,255,255,0.7);
  font-size: 0.93rem;
  transition: color 0.2s;
}

.site-footer ul li a:hover {
  color: var(--white);
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
}

.footer-bottom p {
  margin-bottom: 0;
}

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }

  .content-block,
  .content-block.reverse {
    flex-direction: column;
    gap: 32px;
  }

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

  h1 {
    font-size: 2rem;
  }

  h2 {
    font-size: 1.6rem;
  }

  .hero h1 {
    font-size: 2.2rem;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--white);
    flex-direction: column;
    padding: 20px 24px;
    gap: 16px;
    border-bottom: 1px solid var(--gray-200);
    box-shadow: var(--shadow-md);
  }

  .nav-links.open {
    display: flex;
  }

  .menu-toggle {
    display: block;
  }

  .menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 6px);
  }

  .menu-toggle.active span:nth-child(2) {
    opacity: 0;
  }

  .menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -6px);
  }

  .section {
    padding: 56px 0;
  }

  .hero {
    padding: 56px 0 64px;
  }

  .hero-logo {
    width: 88px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .footer-bottom {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .hero h1 {
    font-size: 1.75rem;
  }

  .hero .tagline {
    font-size: 1.1rem;
  }

  .hero-buttons {
    flex-direction: column;
    align-items: center;
  }

  .btn-lg {
    width: 100%;
    max-width: 300px;
  }

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