/* =========================
   DOWNLOADS PAGE
========================= */

.downloads-page-banner {
  position: relative;
  min-height: 220px;
  display: flex;
  align-items: center;
  padding: 48px 6%;
  background:
    linear-gradient(105deg, rgba(7, 15, 28, 0.92) 0%, rgba(15, 39, 68, 0.88) 45%, rgba(39, 108, 245, 0.35) 100%),
    url("https://images.unsplash.com/photo-1550751827-4bd374c3f58b?auto=format&fit=crop&w=1920&q=80") center / cover no-repeat;
  overflow: hidden;
}

.downloads-page-banner::after {
  content: "";
  position: absolute;
  right: 8%;
  top: 50%;
  transform: translateY(-50%);
  width: 180px;
  height: 180px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(77, 136, 255, 0.45) 0%, transparent 70%);
  pointer-events: none;
}

.downloads-page-banner__title {
  position: relative;
  z-index: 1;
  max-width: 640px;
  font-size: clamp(22px, 4vw, 36px);
  font-weight: 700;
  line-height: 1.3;
  color: #fff;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.downloads-breadcrumb {
  padding: 14px 6%;
  background: var(--card);
  border-bottom: 1px solid var(--border);
}

.downloads-breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  list-style: none;
  font-size: 13px;
}

.downloads-breadcrumb__list a {
  color: var(--primary);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s ease;
}

.downloads-breadcrumb__list a:hover {
  color: var(--primary-hover);
}

.downloads-breadcrumb__list li {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-light);
}

.downloads-breadcrumb__list li:not(:last-child)::after {
  content: "/";
  color: var(--text-light);
  font-weight: 400;
}

.downloads-breadcrumb__list li[aria-current="page"] {
  color: var(--text);
  font-weight: 600;
}

/* Tabs */
.downloads-tabs-wrap {
  background: var(--card);
  border-bottom: 1px solid var(--border);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.04);
}

.downloads-tabs {
  display: flex;
  align-items: stretch;
  max-width: 100%;
  margin: 0 auto;
}

.downloads-tabs__alert {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 72px;
  padding: 0 20px;
  background: var(--card);
  border-right: 1px solid var(--border);
  color: var(--primary);
  font-size: 22px;
}

.downloads-tab {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 22px 16px;
  border: none;
  background: var(--card);
  color: var(--primary);
  font-family: inherit;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition:
    background 0.3s ease,
    color 0.3s ease,
    transform 0.2s ease;
  border-right: 1px solid var(--border);
}

.downloads-tab:last-child {
  border-right: none;
}

.downloads-tab i {
  font-size: 28px;
}

.downloads-tab.is-active {
  background: var(--primary);
  color: #fff;
}

.downloads-tab:not(.is-active):hover {
  background: var(--primary-soft);
}

.downloads-tab:focus-visible {
  outline: 3px solid var(--primary-light);
  outline-offset: -3px;
}

/* Content */
.downloads-content {
  padding: 48px 6% 72px;
}

.downloads-panel {
  display: none;
  animation: downloadsFadeIn 0.35s ease;
}

.downloads-panel.is-active {
  display: block;
}

@keyframes downloadsFadeIn {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.downloads-panel__heading {
  margin-bottom: 28px;
}

.downloads-panel__heading h2 {
  font-size: clamp(20px, 3vw, 28px);
  font-weight: 700;
  color: var(--text);
  margin-bottom: 8px;
}

.downloads-panel__heading p {
  font-size: 14px;
  color: var(--text-light);
  max-width: 560px;
}

.doc-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 22px;
}

/* Document card */
.doc-card {
  display: flex;
  flex-direction: column;
  background: var(--card);
  border-radius: 14px;
  overflow: hidden;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  transition:
    transform 0.35s cubic-bezier(0.4, 0, 0.2, 1),
    box-shadow 0.35s ease;
}

.doc-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 18px 40px rgba(39, 108, 245, 0.15);
}

.doc-card__preview {
  position: relative;
  display: block;
  width: 100%;
  padding: 0;
  border: none;
  background: transparent;
  cursor: pointer;
  aspect-ratio: 3 / 4;
  overflow: hidden;
}

.downloads-alert {
  margin-bottom: 24px;
  padding: 14px 18px;
  border-radius: 10px;
  background: #fff3cd;
  border: 1px solid #ffc107;
  color: #664d03;
  font-size: 14px;
  line-height: 1.55;
}

.downloads-alert a {
  color: var(--primary-dark);
  font-weight: 600;
}

.doc-card__thumb {
  position: relative;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(160deg, #f8fafc 0%, var(--primary-soft) 100%);
  overflow: hidden;
}

.doc-card__pdf-embed {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: none;
  pointer-events: none;
  z-index: 0;
}

.doc-card__thumb.has-embed > .ri-file-pdf-2-fill {
  opacity: 0.15;
}

.doc-card__thumb.is-loaded .doc-card__pdf-embed {
  display: none;
}

.doc-card__preview-img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top center;
  opacity: 0;
  transition: opacity 0.4s ease, transform 0.35s ease;
}

.doc-card__thumb.is-loaded .doc-card__preview-img {
  opacity: 1;
}

.doc-card__thumb.is-loaded > .ri-file-pdf-2-fill {
  display: none;
}

.doc-card__thumb > i.ri-file-pdf-2-fill {
  position: relative;
  z-index: 1;
  font-size: 56px;
  color: #e74c3c;
  transition: transform 0.35s ease, opacity 0.3s ease;
}

.doc-card:hover .doc-card__thumb.is-loaded .doc-card__preview-img {
  transform: scale(1.05);
}

.doc-card:hover .doc-card__thumb:not(.is-loaded) > i.ri-file-pdf-2-fill {
  transform: scale(1.08);
}

.doc-card__overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: rgba(17, 24, 39, 0.55);
  backdrop-filter: blur(2px);
  color: #fff;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.5px;
  opacity: 0;
  transform: scale(1.05);
  transition:
    opacity 0.35s ease,
    transform 0.35s ease;
}

.doc-card__overlay i {
  font-size: 32px;
  color: #fff;
}

.doc-card:hover .doc-card__overlay,
.doc-card__preview:focus-visible .doc-card__overlay {
  opacity: 1;
  transform: scale(1);
}

.doc-card__body {
  padding: 16px 14px 14px;
  text-align: center;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.doc-card__title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  line-height: 1.4;
  margin-bottom: 12px;
  flex: 1;
}

.doc-card__download {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  width: 100%;
  padding: 10px 14px;
  border-radius: 8px;
  background: var(--primary);
  color: #fff;
  font-size: 13px;
  font-weight: 600;
  text-decoration: none;
  transition:
    background 0.25s ease,
    transform 0.2s ease;
}

.doc-card__download:hover {
  background: var(--primary-hover);
}

.doc-card__download:active {
  transform: scale(0.98);
}

/* PDF flipbook modal */
.pdf-modal {
  position: fixed;
  inset: 0;
  z-index: 100000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  opacity: 0;
  visibility: hidden;
  transition:
    opacity 0.3s ease,
    visibility 0.3s ease;
}

.pdf-modal.is-open {
  opacity: 1;
  visibility: visible;
}

.pdf-modal__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(7, 15, 28, 0.88);
  backdrop-filter: blur(6px);
}

.pdf-modal__dialog {
  position: relative;
  z-index: 1;
  width: min(96vw, 920px);
  max-height: 92vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.pdf-modal__header {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  color: #fff;
}

.pdf-modal__title {
  font-size: 16px;
  font-weight: 600;
  flex: 1;
  min-width: 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.pdf-modal__close {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  border: none;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
  font-size: 24px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s ease;
}

.pdf-modal__close:hover {
  background: rgba(255, 255, 255, 0.22);
}

.pdf-modal__book-wrap {
  position: relative;
  width: 100%;
  min-height: 420px;
  display: flex;
  align-items: center;
  justify-content: center;
  perspective: 2000px;
}

#flipbook {
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.45);
  background: #f5f0e8;
}

.pdf-modal__error {
  color: #fff;
  text-align: center;
  padding: 40px 24px;
  font-size: 15px;
  max-width: 420px;
  line-height: 1.6;
}

.pdf-simple-viewer {
  width: 100%;
  max-width: 520px;
  display: flex;
  justify-content: center;
}

.pdf-simple-viewer__page {
  background: #fff;
  border-radius: 8px;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.35);
  overflow: hidden;
  max-height: 70vh;
}

.pdf-simple-viewer__img {
  display: block;
  max-width: 100%;
  max-height: 70vh;
  width: auto;
  height: auto;
  margin: 0 auto;
}

.pdf-native-viewer {
  width: 100%;
  max-width: 900px;
  height: min(75vh, 720px);
  background: #fff;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.35);
}

.pdf-native-viewer__iframe {
  width: 100%;
  height: 100%;
  border: none;
  display: block;
}

#flipbook .page {
  background: #fff;
  border: 1px solid rgba(0, 0, 0, 0.06);
  overflow: hidden;
}

#flipbook .page img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
  background: #fff;
}

.pdf-modal__loader {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  background: rgba(7, 15, 28, 0.75);
  color: #fff;
  font-size: 14px;
  font-weight: 500;
  border-radius: 12px;
  z-index: 5;
  pointer-events: none;
}

.pdf-modal__loader.is-hidden {
  display: none;
}

.pdf-modal__loader-spinner {
  width: 40px;
  height: 40px;
  border: 3px solid rgba(255, 255, 255, 0.25);
  border-top-color: #fff;
  border-radius: 50%;
  animation: pdfSpin 0.8s linear infinite;
}

@keyframes pdfSpin {
  to {
    transform: rotate(360deg);
  }
}

.pdf-modal__controls {
  display: flex;
  align-items: center;
  gap: 16px;
}

.pdf-modal__controls button {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 20px;
  border: none;
  border-radius: 10px;
  background: var(--primary);
  color: #fff;
  font-family: inherit;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s ease;
}

.pdf-modal__controls button:hover:not(:disabled) {
  background: var(--primary-hover);
}

.pdf-modal__controls button:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.pdf-modal__page-info {
  color: #fff;
  font-size: 14px;
  font-weight: 500;
  min-width: 100px;
  text-align: center;
}

/* Responsive grid */
@media (max-width: 1400px) {
  .doc-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

@media (max-width: 992px) {
  .downloads-tabs__alert {
    min-width: 56px;
    padding: 0 14px;
  }

  .downloads-tab {
    padding: 18px 12px;
    font-size: 13px;
  }

  .downloads-tab i {
    font-size: 24px;
  }
}

@media (max-width: 768px) {
  .downloads-page-banner {
    min-height: 160px;
    padding: 32px 5%;
  }

  .downloads-breadcrumb {
    padding: 12px 5%;
  }

  .downloads-content {
    padding: 32px 5% 56px;
  }

  .doc-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }

  .downloads-tabs {
    flex-wrap: nowrap;
  }

  .downloads-tab span {
    font-size: 12px;
  }
}

@media (max-width: 480px) {
  .downloads-tabs__alert {
    display: none;
  }

  .pdf-modal {
    padding: 12px;
  }

  .pdf-modal__controls {
    flex-wrap: wrap;
    justify-content: center;
  }
}

body.pdf-modal-open {
  overflow: hidden;
}

@media (prefers-reduced-motion: reduce) {
  .downloads-panel,
  .doc-card,
  .doc-card__overlay,
  .pdf-modal {
    animation: none;
    transition: none;
  }
}