/* ===== BASE STYLES - Library Theme ===== */
:root {
  --color-primary: #8B4513;
  --color-secondary: #2E8B57;
  --color-accent: #DAA520;
  --color-cream: #FFF8DC;
  --color-dark: #3D2914;
  --color-text: #2C1810;
  --color-text-light: #5C4033;
  --color-paper: #FAF0E6;
  --shadow-soft: 0 4px 20px rgba(61, 41, 20, 0.15);
  --shadow-medium: 0 8px 30px rgba(61, 41, 20, 0.25);
  --radius: 16px;
  --radius-lg: 24px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Nunito', sans-serif;
  background: var(--color-cream);
  color: var(--color-text);
  line-height: 1.6;
  min-height: 100vh;
  position: relative;
}

/* ===== BACKGROUND LIBRARY ===== */
.bg-library {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  overflow: hidden;
}

.bg-shelf {
  position: absolute;
  width: 100%;
  height: 120px;
  background: linear-gradient(180deg, 
    #5D4037 0%, 
    #4E342E 30%, 
    #3D2914 100%);
  border-bottom: 8px solid #2C1810;
  box-shadow: 0 4px 15px rgba(0,0,0,0.3);
}

.shelf1 { top: 20%; }
.shelf2 { top: 50%; }
.shelf3 { top: 80%; }

.bg-shelf::before,
.bg-shelf::after {
  content: '';
  position: absolute;
  width: 8px;
  height: 100%;
  background: #2C1810;
  top: 0;
}

.bg-shelf::before { left: 15%; }
.bg-shelf::after { right: 15%; }

.bg-light {
  position: absolute;
  top: -10%;
  right: 20%;
  width: 300px;
  height: 400px;
  background: radial-gradient(ellipse, 
    rgba(255,248,220,0.4) 0%, 
    transparent 70%);
  animation: float 8s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  50% { transform: translateY(-20px) rotate(2deg); }
}

/* ===== NAVIGATION ===== */
.navbar {
  background: linear-gradient(180deg, var(--color-dark), #2C1810);
  padding: 12px 20px;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-soft);
}

.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-logo {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--color-cream);
  text-decoration: none;
  text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

.nav-hamburger {
  display: none;
  background: none;
  border: none;
  color: var(--color-cream);
  font-size: 1.5rem;
  cursor: pointer;
}

.nav-links {
  display: flex;
  gap: 20px;
  align-items: center;
}

.nav-links a {
  color: var(--color-cream);
  text-decoration: none;
  font-weight: 600;
  padding: 8px 16px;
  border-radius: 20px;
  transition: all 0.3s ease;
}

.nav-links a:hover {
  background: var(--color-primary);
}

.nav-badge {
  background: var(--color-accent);
  color: var(--color-dark);
  padding: 6px 12px;
  border-radius: 20px;
  font-weight: 700;
  font-size: 0.9rem;
}

/* ===== HERO SECTION ===== */
.hero {
  min-height: 90vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px 20px;
  position: relative;
}

.hero-inner {
  max-width: 900px;
  text-align: center;
  background: rgba(250, 240, 230, 0.95);
  padding: 50px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-medium);
  border: 3px solid var(--color-primary);
}

.hero-badge {
  display: inline-block;
  background: var(--color-secondary);
  color: white;
  padding: 8px 20px;
  border-radius: 20px;
  font-weight: 700;
  font-size: 0.9rem;
  margin-bottom: 20px;
}

.hero h1 {
  font-size: 3rem;
  font-weight: 900;
  color: var(--color-dark);
  margin-bottom: 20px;
  line-height: 1.2;
}

.hero h1 span {
  color: var(--color-primary);
  text-shadow: 2px 2px 0 var(--color-accent);
}

.hero-sub {
  font-size: 1.2rem;
  color: var(--color-text-light);
  max-width: 600px;
  margin: 0 auto 40px;
}

/* ===== GRADE CARDS ===== */
.grades-grid h2 {
  font-size: 1.8rem;
  margin-bottom: 30px;
  color: var(--color-dark);
}

.grade-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 20px;
}

.grade-card {
  background: linear-gradient(145deg, var(--color-paper), var(--color-cream));
  border: 3px solid var(--color-primary);
  border-radius: var(--radius);
  padding: 25px 15px;
  text-decoration: none;
  color: var(--color-text);
  transition: all 0.3s ease;
  box-shadow: var(--shadow-soft);
}

.grade-card:hover {
  transform: translateY(-5px) scale(1.02);
  box-shadow: var(--shadow-medium);
  border-color: var(--color-accent);
}

.grade-number {
  font-size: 3rem;
  font-weight: 900;
  color: var(--color-primary);
  line-height: 1;
}

.grade-name {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-text-light);
  margin-bottom: 10px;
}

.grade-works {
  font-size: 0.85rem;
  color: var(--color-secondary);
}

/* ===== FEATURES SECTION ===== */
.features {
  padding: 60px 20px;
  background: linear-gradient(180deg, transparent, rgba(139, 69, 19, 0.05));
}

.container {
  max-width: 1200px;
  margin: 0 auto;
}

.features h2 {
  text-align: center;
  font-size: 2rem;
  margin-bottom: 40px;
  color: var(--color-dark);
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 30px;
}

.feature-card {
  background: var(--color-paper);
  padding: 30px;
  border-radius: var(--radius);
  border: 2px solid var(--color-primary);
  text-align: center;
  transition: all 0.3s ease;
}

.feature-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-soft);
}

.feature-icon {
  font-size: 3rem;
  margin-bottom: 15px;
}

.feature-card h3 {
  font-size: 1.3rem;
  color: var(--color-dark);
  margin-bottom: 10px;
}

.feature-card p {
  color: var(--color-text-light);
  font-size: 0.95rem;
}

/* ===== FOOTER ===== */
.footer {
  background: var(--color-dark);
  color: var(--color-cream);
  padding: 40px 20px;
  text-align: center;
}

.footer p {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.footer-sub {
  font-size: 0.9rem;
  opacity: 0.8;
  font-weight: 400;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
  .nav-hamburger {
    display: block;
  }
  
  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-dark);
    flex-direction: column;
    padding: 20px;
    gap: 10px;
  }
  
  .nav-links.open {
    display: flex;
  }
  
  .hero-inner {
    padding: 30px 20px;
  }
  
  .hero h1 {
    font-size: 2rem;
  }
  
  .grade-cards {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .grade-number {
    font-size: 2.5rem;
  }
}

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