:root {
    --clr-bg: #050816;
    --clr-bg-alt: #0b1020;
    --clr-surface: #111827;
    --clr-surface-alt: #1f2937;
    --clr-primary: #2563eb;
    --clr-primary-soft: rgba(37, 99, 235, 0.15);
    --clr-accent: #f97316;
    --clr-text: #e5e7eb;
    --clr-muted: #9ca3af;
    --clr-border: #1f2937;
    --radius-lg: 16px;
    --radius-md: 12px;
    --radius-sm: 8px;
    --shadow-soft: 0 18px 45px rgba(0, 0, 0, 0.45);
    --shadow-card: 0 10px 30px rgba(0, 0, 0, 0.4);
    --transition-fast: 180ms ease-out;
    --transition-med: 260ms ease-out;
    --max-width: 95vw;
  }

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

  html {
    scroll-behavior: smooth;
  }

  body {
    margin: 0;
    font-family: "Inter", system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
    color: var(--clr-text);
    background: radial-gradient(circle at top left, #1d4ed8 0, transparent 55%),
      radial-gradient(circle at bottom right, #f97316 0, transparent 55%),
      var(--clr-bg);
    min-height: 100vh;
    cursor: pointer;
  }

  /* Layout helpers */

  .container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 1.5rem;
  }

  .section {
    padding: 5rem 0;
  }
  .sections {
    padding: 5rem 4rem;
  }
  .containers
  {
    margin: 0;
  }

  .section-alt {
    background: linear-gradient(
        135deg,
        rgba(37, 99, 235, 0.08),
        rgba(15, 23, 42, 0.8)
      ),
      var(--clr-bg-alt);
  }

  .section-header {
    text-align: center;
    margin-bottom: 3rem;
  }

  .section-header h2 {
    font-size: 2rem;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    margin: 0 0 0.5rem;
  }

  .section-subtitle {
    margin: 0;
    color: var(--clr-muted);
    max-width: 520px;
    margin-inline: auto;
  }

  /* Header */

  .site-header {
    position: sticky;
    top: 0;
    z-index: 40;
    backdrop-filter: blur(14px);
    background: linear-gradient(
      to bottom,
      rgba(15, 23, 42, 0.98),
      rgba(15, 23, 42, 0.88),
      transparent
    );
    border-bottom: 1px solid rgba(55, 65, 81, 0.7);
  }

  .header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 0.5rem;
  }

  .brand {
    display: flex;
    align-items: center;
    text-decoration: none;
    color: inherit;
    gap: 0.75rem;
  }

  .brand-logo , .brand-logo img {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.85rem;
    box-shadow: 0 0 0 3px rgba(15, 23, 42, 0.9);
  }

  .brand-text {
    display: flex;
    flex-direction: column;
  }

  .brand-name {
    font-weight: 600;
    font-size: 0.98rem;
  }

  .brand-tagline {
    font-size: 0.75rem;
    color: var(--clr-muted);
  }

  /* Nav */

  .main-nav {
    display: flex;
    align-items: center;
  }

  .nav-links {
    list-style: none;
    display: flex;
    gap: 1rem;
    padding: 0;
    margin: 0;
  }

  .nav-links a {
    text-decoration: none;
    font-size: 0.88rem;
    color: var(--clr-muted);
    padding: 0.4rem 0.7rem;
    border-radius: 999px;
    white-space: nowrap;
    transition: color var(--transition-fast), background var(--transition-fast),
      transform var(--transition-fast);
      
  }

  .nav-links a:hover,
  .nav-links a:focus-visible {
    background: rgba(37, 99, 235, 0.14);
    color: #e5edff;
    transform: translateY(-1px);
  }

  .nav-toggle {
    display: none;
    background: none;
    border: none;
    padding: 0.25rem;
    cursor: pointer;
  }

  .nav-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    margin: 4px 0;
    background: #e5e7eb;
    border-radius: 999px;
    transition: transform var(--transition-fast), opacity var(--transition-fast);
  }

  /* Hero */

  .hero {
    padding-top: 6rem;
  }

  .hero-inner {
    display: grid;
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    gap: 3rem;
    align-items: center;
  }

  .hero-text h1 {
    font-size: clamp(2.3rem, 4vw, 2.9rem);
    line-height: 1.1;
    margin: 0 0 0.75rem;
  }

  .hero-subtitle {
    margin: 0 0 1.5rem;
    color: var(--clr-muted);
    max-width: 520px;
  }

  .hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
  }

  .hero-highlights {
    list-style: none;
    padding: 0;
    margin: 0;
  }

  .hero-highlights li {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
    color: var(--clr-muted);
    margin-bottom: 0.4rem;
  }

  .hero-highlights li::before {
    content: "";
    width: 7px;
    height: 7px;
    border-radius: 3px;
    background: linear-gradient(135deg, #22c55e, #4ade80);
  }

  /* Hero visual */

  .hero-visual {
    display: flex;
    align-items: center;
    justify-content: center;
  }

  .hero-book-card {
    background: radial-gradient(circle at top left, #2563eb 0, transparent 50%),
      radial-gradient(circle at bottom right, #f97316 0, transparent 55%),
      var(--clr-surface);
    border-radius: 32px;
    padding: 1.2rem;
    box-shadow: var(--shadow-soft);
    position: relative;
    overflow: hidden;
  }

  .hero-book-card::after {
    content: "";
    position: absolute;
    inset: 0;
    border-radius: inherit;
    border: 1px solid rgba(148, 163, 184, 0.25);
    pointer-events: none;
  }

  .hero-book-card img {
    width: 100%;
    max-width: 220px;
    border-radius: 20px;
    display: block;
    margin-inline: auto;
    box-shadow: var(--shadow-card);
  }

  .hero-book-info {
    margin-top: 1rem;
    text-align: center;
  }

  .hero-book-info h3 {
    margin: 0 0 0.3rem;
  }

  .hero-book-info p {
    margin: 0 0 0.75rem;
    font-size: 0.85rem;
    color: var(--clr-muted);
  }

  /* Buttons */

  .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    border-radius: 999px;
    padding: 0.55rem 1.2rem;
    font-size: 0.9rem;
    font-weight: 500;
    border: 1px solid transparent;
    cursor: pointer;
    text-decoration: none;
    transition: background var(--transition-med), color var(--transition-med),
      transform var(--transition-med), box-shadow var(--transition-med),
      border-color var(--transition-med);
  }

  .btn-primary {
    background: linear-gradient(135deg, #2563eb, #1d4ed8);
    color: #e5edff;
    box-shadow: 0 12px 25px rgba(37, 99, 235, 0.35);
  }

  .btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 16px 40px rgba(37, 99, 235, 0.4);
  }

  .btn-outline {
    background: rgba(15, 23, 42, 0.55);
    color: var(--clr-text);
    border-color: rgba(148, 163, 184, 0.5);
  }

  .btn-outline:hover {
    border-color: var(--clr-primary);
    background: var(--clr-primary-soft);
  }

  .btn-sm {
    padding: 0.4rem 0.9rem;
    font-size: 0.8rem;
  }

  /* About */

  .about-layout {
    display: grid;
    /* grid-template-columns: minmax(0, 1.75fr) minmax(0, 1.1fr); */
    gap: 2.5rem;
    align-items: flex-start;
  }

  .about-text p {
    margin-top: 0;
    margin-bottom: 1rem;
    color: #d1d5db;
  }

  .card {
    background: linear-gradient(
        135deg,
        rgba(148, 163, 184, 0.2),
        rgba(15, 23, 42, 0.95)
      ),
      #020617;
    border-radius: var(--radius-lg);
    padding: 1.4rem 1.5rem;
    border: 1px solid rgba(148, 163, 184, 0.25);
    box-shadow: var(--shadow-card);
  }

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

  .author-photo {
    width: 96px;
    height: 96px;
    border-radius: 999px;
    object-fit: cover;
    margin-bottom: 0.75rem;
    border: 2px solid rgba(148, 163, 184, 0.7);
  }

  .card-author h3 {
    margin: 0 0 0.25rem;
  }

  .card-author p {
    margin: 0.2rem 0;
  }

  .author-note {
    margin-top: 0.8rem;
    font-size: 0.85rem;
    color: var(--clr-muted);
  }

  .contact-list {
    list-style: none;
    padding: 0;
    margin: 1rem 0 0;
    font-size: 0.82rem;
    color: var(--clr-muted);
  }

  .contact-list li + li {
    margin-top: 0.2rem;
  }

  /* Cards grid */

  .cards-grid {
    display: grid;
    justify-content: center;
    grid-template-columns: repeat(auto-fit, minmax(320px,560px)); 
    gap: 1.5rem;
  }

  /* Workshop cards */

  .workshop-card {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    min-height: 420px;              /* uniform height */
  }

  .workshop-image {
    width: 100%;
    border-radius: var(--radius-md);
    object-fit: cover;
    height: 200px;
    cursor: pointer;
  }

  .workshop-tags , .workshop-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin: 0.75rem 0;
    font-size: 0.8rem;
    color: var(--clr-muted);
  }

  .chip {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    padding: 0.2rem 0.6rem;
    border-radius: 999px;
    background: rgba(15, 23, 42, 0.7);
    border: 1px solid rgba(148, 163, 184, 0.4);
  }
  .workshop-image {
    transition: transform 0.25s ease, box-shadow 0.25s ease;
  }
  
  .workshop-image:hover {
    transform: scale(1.03);
    cursor: pointer;
    box-shadow: 0 10px 30px rgba(0,0,0,0.35);
  }
  
  /* Book cards */

  .book-card {
    display: flex;
    flex-direction: column;
    gap: 1rem;
  }

  .book-cover-wrap {
    position: relative;
  }

  .book-cover {
    width: 100%;
    max-width: 230px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-card);
    display: block;
    margin-inline: auto;
  }

  .badge {
    position: absolute;
    bottom: 0.9rem;
    right: 0.9rem;
    padding: 0.25rem 0.65rem;
    border-radius: 999px;
    font-size: 0.75rem;
    background: rgba(15, 23, 42, 0.85);
    border: 1px solid rgba(148, 163, 184, 0.5);
  }

  .book-info h3 {
    margin: 0 0 0.3rem;
  }

  .book-info p {
    margin: 0;
    font-size: 0.86rem;
    color: var(--clr-muted);
  }

  .book-meta-row {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin: 0.75rem 0;
    font-size: 0.8rem;
  }

  .book-meta-item {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    padding: 0.2rem 0.6rem;
    border-radius: 999px;
    background: rgba(15, 23, 42, 0.7);
    border: 1px solid rgba(148, 163, 184, 0.4);
  }

  .book-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
  }





.testimonial-group-header{
  display: flex;
  flex-direction: column;
  width: 100%;
align-items: center;
margin-bottom: 5vh;
}
.testimonial-slider-group {
  display: flex;
  align-items: center;
  gap: 1rem;
  width: 100%;
  justify-content: center;
  margin-bottom: 3rem;
}

.testimonial-frame {
  width: 100%;
  overflow: hidden;
}

.testimonial-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr); /* 3 per row */
  grid-auto-rows: auto;
  gap: 1rem;
  transition: transform 0.5s ease-in-out;
  will-change: transform;
  width: 100%;
}

.testimonial-card {
  border: 1px solid rgba(255,255,255,0.15);
  min-width: 100%;
  max-width: 100%;
  padding: 1.6rem 3.2rem ;
    background:
      radial-gradient(circle at top left, rgba(59, 130, 246, 0.6), transparent 55%),
      radial-gradient(circle at bottom right, rgba(15, 23, 42, 0.9), rgba(15, 23, 42, 0.98));
  border-radius: var(--radius-lg);
  border: 1px solid rgba(148, 163, 184, 0.35);
}

.slider-btn {

  border-radius: 999px;
  border: 1px solid rgba(148, 163, 184, 0.6);
  background: rgba(15, 23, 42, 0.9);
  color: var(--clr-text);
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  cursor: pointer;
  transition: background var(--transition-fast), transform var(--transition-fast);
  z-index: 5;
}
/* Mobile responsive */
@media (max-width: 900px) {
  .testimonial-grid {
    grid-template-columns: repeat(2, 1fr); /* 2 per row */
  }
}

@media (max-width: 600px) {
  .testimonial-grid {
    grid-template-columns: repeat(1, 1fr); /* 1 per row */
  }
}
/* Mobile testimonial readability */
@media (max-width: 600px) {
  .sections{
    padding: 5rem 1.5rem;
  }
  .testimonial-card {
    padding: 1.1rem 1.2rem;
  }

  .testimonial-message {
    font-size: 0.9rem;
    line-height: 1.5;
  }

  .testimonial-author strong {
    font-size: 0.85rem;
  }

  .testimonial-author span {
    font-size: 0.78rem;
    color: var(--clr-muted);
  }
}



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


  /* Gallery */

  .gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.25rem;
  }

  .gallery-item {
    position: relative;
    overflow: hidden;
    border-radius: var(--radius-md);
    cursor: zoom-in;
    background: #020617;
  }

  .gallery-item img {
    width: 100%;
    height: 100%;
    display: block;
    object-fit: cover;
    transition: transform 260ms ease-out, opacity 260ms ease-out;
  }

  .gallery-item-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(15, 23, 42, 0.9), transparent);
    opacity: 0;
    transition: opacity 220ms ease-out;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    padding: 0.8rem;
    font-size: 0.8rem;
  }

  .gallery-item-title {
    font-weight: 500;
  }

  .gallery-item-caption {
    color: var(--clr-muted);
    margin-top: 0.2rem;
  }

  .gallery-item:hover img {
    transform: scale(1.04);
    opacity: 0.9;
  }

  .gallery-item:hover .gallery-item-overlay {
    opacity: 1;
  }

  /* Links */

  .links-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
    gap: 1rem;
  }

  .link-card {
    border-radius: var(--radius-md);
    padding: 1rem 1.1rem;
    background: rgba(15, 23, 42, 0.85);
    border: 1px solid rgba(148, 163, 184, 0.4);
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
  }

  .link-card-type {
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.14em;
    color: var(--clr-muted);
  }

  .link-card a {
    color: #bfdbfe;
    text-decoration: none;
    word-break: break-word;
  }

  .link-card a:hover {
    text-decoration: underline;
  }

  /* Footer */

  .site-footer {
    border-top: 1px solid rgba(55, 65, 81, 0.85);
    background: rgba(15, 23, 42, 0.98);
    padding: 1.8rem 0;
  }

  .footer-inner {
    display: flex;
    flex-wrap: wrap;
    gap: 1.2rem;
    align-items: flex-start;
    justify-content: space-between;
    font-size: 0.82rem;
  }

  .footer-meta {
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
    color: var(--clr-muted);
  }

  /* Modals */

  .modal {
    position: fixed;
    inset: 0;
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 50;
  }

  .modal.is-open {
    display: flex;
  }

  .modal-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(15, 23, 42, 0.9);
  }

  .modal-dialog {
    position: relative;
    z-index: 60;
    max-width: 720px;
    width: 100%;
    margin: 1.5rem;
    border-radius: 18px;
    background: #020617;
    border: 1px solid rgba(148, 163, 184, 0.4);
    box-shadow: var(--shadow-soft);
    max-height: 90vh;
    overflow: hidden;
  }

  .modal-dialog-large {
    max-width: 880px;
  }

  .modal-content {
    padding: 1.5rem 1.7rem;
    max-height: 90vh;
    overflow-y: auto;
  }

  .modal-close {
    position: absolute;
    top: 0.6rem;
    right: 0.6rem;
    border-radius: 999px;
    border: none;
    background: rgba(15, 23, 42, 0.9);
    color: #e5e7eb;
    width: 30px;
    height: 30px;
    cursor: pointer;
  }

  .modal-close:hover {
    background: rgba(37, 99, 235, 0.9);
  }

  .lightbox-content {
    padding: 0.8rem;
  }

  .lightbox-content img {
    width: 100%;
    border-radius: 12px;
    display: block;
    margin-bottom: 0.5rem;
  }

  .lightbox-content p {
    font-size: 0.85rem;
    color: var(--clr-muted);
  }

  /* Book modal layout */

  .book-modal-layout {
    display: grid;
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1.7fr);
    gap: 1.4rem;
  }

  .book-modal-layout img {
    width: 100%;
    border-radius: 12px;
    box-shadow: var(--shadow-card);
  }

  .book-modal-section-title {
    font-size: 0.86rem;
    text-transform: uppercase;
    letter-spacing: 0.14em;
    color: var(--clr-muted);
    margin-top: 1rem;
    margin-bottom: 0.4rem;
  }

  .book-modal-layout ul {
    padding-left: 1.2rem;
    margin-top: 0;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
  }

  .book-modal-layout li + li {
    margin-top: 0.25rem;
  }
  .book-modal-actions{
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
  }
  /* Animations on scroll */

  .reveal {
    opacity: 0;
    transform: translateY(16px);
    transition: opacity 420ms ease-out, transform 420ms ease-out;
  }

  .reveal.is-visible {
    opacity: 1;
    transform: translateY(0);
  }

  /* Responsive */

  @media (max-width: 900px) {
    .hero-inner {
      grid-template-columns: minmax(0, 1fr);
    }

    .hero-visual {
      order: -1;
    }

    .about-layout {
      grid-template-columns: minmax(0, 1fr);
    }
  }

  @media (max-width: 1300px) {
    .nav-toggle {
      display: block;
    }

    .main-nav {
      position: absolute;
      inset-inline: 0;
      top: 100%;
      padding: 0 1.5rem 0.75rem;
      display: none;
    }

    .main-nav.is-open {
      display: block;
      margin-top: 1rem;
    }

    .nav-links {
      flex-direction: column;
      background: rgba(15, 23, 42, 0.98);
      border-radius: 16px;
      padding: 0.8rem;
      border: 1px solid rgba(55, 65, 81, 0.85);
    }

    .book-modal-layout {
      grid-template-columns: minmax(0, 1fr);
    }
  }


  .testimonial-card,
.workshop-card,
.book-card {
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
}


.testimonial-card:hover,
.workshop-card:hover,
.book-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.55);
}

.btn-success {
  background: linear-gradient(135deg, #22c55e, #16a34a);
  color: #eafff1;
  box-shadow: 0 12px 25px rgba(34, 197, 94, 0.35);
  border: 1px solid rgba(34, 197, 94, 0.6);
}

.btn-success:hover {
  transform: translateY(-1px);
  box-shadow: 0 16px 40px rgba(34, 197, 94, 0.5);
}
.coming-soon {
  text-align: center;
  padding: 3rem 1.5rem;
  border-radius: var(--radius-lg);
  background: linear-gradient(
    135deg,
    rgba(37, 99, 235, 0.15),
    rgba(15, 23, 42, 0.9)
  );
  border: 1px dashed rgba(148, 163, 184, 0.5);
  color: var(--clr-muted);
}

.coming-soon h3 {
  margin-bottom: 0.5rem;
  color: var(--clr-text);
}


.papers-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
}

.paper-card h3 {
  margin: 0 0 0.3rem;
}

.paper-subject {
  font-size: 0.85rem;
  color: var(--clr-muted);
  margin-bottom: 0.4rem;
}

.paper-meta {
  display: flex;
  gap: 0.6rem;
  font-size: 0.75rem;
  color: var(--clr-muted);
  margin: 0.6rem 0 0.9rem;
}

.paper-meta span {
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  border: 1px solid rgba(148, 163, 184, 0.4);
}
.workshop-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  margin-top: 2rem;
  flex-wrap: wrap;
}
/* =========================
   Flipbook Section
========================= */



.modal-dialog-large {
  width: 100%;
  height: 100vh;
  margin: 0;
}

.sample-card {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.sample-card h3 {
  margin: 0;
  font-size: 1rem;
}

.sample-desc {
  font-size: 0.88rem;
  color: var(--clr-muted);
}

.sample-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 0.5rem;
}

/* Mobile */
@media (max-width: 600px) {
  .sample-actions {
    flex-direction: column;
  }

  .sample-actions .btn {
    width: 100%;
    justify-content: center;
  }
}