/* ======
   GLOBAL VARIABLES
====== */
:root {
  --color-bg: #f8f9fb;            
  --color-text: #1f2937;           
  --color-heading: #111827;        
  --color-muted: #4b5563;          
  --color-subheading: #374151;    

  --color-link: #2563eb;           
  --color-link-hover: #1d4ed8;     

  --color-border: #e5e7eb;         
  --color-outline: #d1d5db;        
  --color-outline-hover: #f3f4f6; 
  --color-white: #ffffff;          

  --color-footer-bg: #111827;      
  --color-footer-text: #d1d5db;    
  --color-footer-link: #9ca3af;    
}

/* =======
   GLOBAL
========= */
body {
  font-family: "Nunito Sans", sans-serif;
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
}

h1, h2, h3, h4 {
  font-weight: 700;
  color: var(--color-heading);
}

p {
  color: var(--color-muted);
}

/* =======
   NAVBAR
========= */
header {
  background: var(--color-white);
  border-bottom: 1px solid var(--color-border);
}

header a {
  font-weight: 500;
  transition: color 0.2s ease;
}

header a:hover {
  color: var(--color-link);
}

#menu-btn {
  font-size: 1.5rem;
  color: var(--color-heading);
}

/* ======
   HERO
=======*/
.hero-title {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--color-heading);
  line-height: 1.2;
}

.hero-subtitle {
  font-size: 1.125rem;
  color: var(--color-subheading);
  margin-bottom: 1.5rem;
}

@media (min-width: 768px) {
  .hero-title {
    font-size: 3rem;
  }
  .hero-subtitle {
    font-size: 1.25rem;
  }
}

@media (min-width: 1024px) {
  .hero-title {
    font-size: 3.5rem;
  }
}

/* ========
   BUTTONS
============ */
.btn-primary {
  background-color: var(--color-link);
  color: var(--color-white);
  padding: 0.75rem 1.5rem;
  border-radius: 0.75rem;
  font-weight: 600;
  transition: all 0.3s ease;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
}

.btn-primary:hover {
  background-color: var(--color-link-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(37, 99, 235, 0.3);
}

.btn-outline {
  border: 2px solid var(--color-outline);
  padding: 0.75rem 1.5rem;
  border-radius: 0.75rem;
  font-weight: 600;
  transition: all 0.3s ease;
}

.btn-outline:hover {
  background-color: var(--color-link);
  color: var(--color-white);
  border-color: var(--color-link);
  transform: translateY(-2px);
}

/* ========
   SECTIONS
========*/
section {
  padding: 4rem 0;
}

.section-title {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 2rem;
  text-align: center;
  position: relative;
}

.section-title::after {
  content: "";
  display: block;
  width: 60px;
  height: 4px;
  background: var(--color-link);
  margin: 0.75rem auto 0;
  border-radius: 2px;
}

/* =======
   EVENTS
======*/
.event-card {
  border-radius: 1rem;
  overflow: hidden;
  position: relative;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.event-card img {
  width: 100%;
  height: auto;
  object-fit: cover;
}

.event-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 10px 25px rgba(0,0,0,0.15);
}

.event-card .event-info {
  position: absolute;
  bottom: 1.5rem;
  left: 1.5rem;
  color: var(--color-white);
  font-size: 1.5rem;
  font-weight: 700;
  max-width: 80%;
  text-shadow: 0 2px 6px rgba(0,0,0,0.5);
}

/* =========
   FOOTER
========*/
footer {
  background: var(--color-footer-bg);
  color: var(--color-footer-text);
}

footer h3 {
  color: var(--color-white);
  margin-bottom: 0.75rem;
  font-weight: 600;
}

footer a {
  color: var(--color-footer-link);
  transition: color 0.2s ease;
}

footer a:hover {
  color: var(--color-white);
  text-decoration: underline;
}

/* =========
   ANIMATIONS
========*/

/* Scroll reveal fade-in */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Simple zoom animation for modal */
.modal {
  opacity: 0;
  transform: scale(0.95);
  transition: opacity 0.3s ease, transform 0.3s ease;
}

.modal.active {
  opacity: 1;
  transform: scale(1);
}

/* =======
   BOOKS CAROUSEL
======*/

/* Container hides scrollbar, slides move by transform */
#books-carousel {
  overflow: hidden;
  display: flex;
  user-select: none;
  scroll-behavior: smooth;
  will-change: transform;
}

/* Book card slides (width set dynamically in JS) */
#books-carousel > div {
  scroll-snap-align: start;
}

/* Images contained fully, no cropping */
#books-carousel img {
  object-fit: contain;
  width: 100%;
  height: auto;
}

/* Responsive widths for slides */
@media (max-width: 640px) {
  #books-carousel > div {
    width: 80vw; /* fill 80% of viewport width on mobile */
  }
}
@media (min-width: 641px) {
  #books-carousel > div {
    width: 192px; /* fixed width on desktop */
  }
}

/* Hide scrollbar but allow scroll if overflow appears (fallback) */
#books-carousel::-webkit-scrollbar {
  display: none;
}

#books-carousel {
  scrollbar-width: none;       /* Firefox */
  -ms-overflow-style: none;    /* IE/Edge */
}