/* Malleable Micro Magazine
   Version 1.0
   Mobile-first tap-through magazine format
*/

/* ============================================
   RESET & BASE
   ============================================ */

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

html {
  height: 100%;
  height: -webkit-fill-available;
}

body {
  min-height: 100%;
  min-height: -webkit-fill-available;
  overflow: hidden;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  font-size: 16px;
  line-height: 1.5;
  background: #000;
  color: #1a1a1a;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  -webkit-tap-highlight-color: transparent;
  touch-action: pan-y;
}

/* ============================================
   MAGAZINE CONTAINER
   ============================================ */

.magazine {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #000;
}

/* ============================================
   PROGRESS BAR (inside frame)
   ============================================ */

.progress {
  position: fixed;
  top: 20px;
  left: 20px;
  right: 20px;
  height: 3px;
  background: rgba(255, 255, 255, 0.2);
  z-index: 100;
  border-radius: 2px;
}

.progress-bar {
  height: 100%;
  background: #fff;
  width: 0%;
  transition: width 0.3s ease-out;
  will-change: width;
  border-radius: 2px;
}

/* Adjust for larger frame on desktop */
@media (min-width: 768px) {
  .progress {
    top: 24px;
    left: 24px;
    right: 24px;
  }
}

/* ============================================
   NAVIGATION HINTS
   ============================================ */

.nav-hint {
  position: fixed;
  top: 50%;
  left: 0;
  right: 0;
  transform: translateY(-50%);
  display: flex;
  justify-content: space-between;
  padding: 0 8px;
  pointer-events: none;
  z-index: 50;
  opacity: 0.4;
  transition: opacity 0.6s ease;
}

.nav-hint.hidden {
  opacity: 0;
}

.hint-left,
.hint-right {
  font-size: 2rem;
  font-weight: 300;
  color: #fff;
  text-shadow: 0 2px 8px rgba(0, 0, 0, 0.6);
}

/* ============================================
   PAGES CONTAINER
   ============================================ */

.pages {
  position: relative;
  width: 100%;
  height: 100%;
  max-width: 430px;
  max-height: 932px;
}

/* On very wide screens, show phone-like frame */
@media (min-width: 768px) and (min-height: 600px) {
  .pages {
    border-radius: 32px;
    overflow: hidden;
    box-shadow: 
      0 0 0 8px #1a1a1a,
      0 25px 80px rgba(0, 0, 0, 0.6);
  }
}

/* ============================================
   INDIVIDUAL PAGE
   ============================================ */

.page {
  position: absolute;
  inset: 0;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.35s ease-out, visibility 0.35s ease-out;
  will-change: opacity;
}

.page.active {
  opacity: 1;
  visibility: visible;
}

/* Touch targets for navigation */
.page::before,
.page::after {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  width: 30%;
  z-index: 30;
  cursor: pointer;
}

.page::before {
  left: 0;
}

.page::after {
  right: 0;
}

/* ============================================
   FRAME (National Geographic border)
   ============================================ */

.frame {
  position: absolute;
  inset: 0;
  padding: 16px;
  background: var(--frame-colour, #4A90A4);
}

.frame-inner {
  position: relative;
  width: 100%;
  height: 100%;
  background: #fff;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

/* Larger frame on bigger screens */
@media (min-width: 768px) {
  .frame {
    padding: 20px;
  }
}

/* ============================================
   COVER PAGE
   ============================================ */

.page-cover .frame-inner {
  background: #000;
}

/* Cover media (video or image) */
.cover-media {
  position: absolute;
  inset: 0;
  overflow: hidden;
}

.cover-video,
.cover-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* Cover overlay */
.cover-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  z-index: 10;
}

/* Masthead (logo) */
.masthead {
  padding: 24px 20px 16px;
  text-align: center;
}

.masthead img {
  height: 48px;
  width: auto;
  max-width: 80%;
  filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.3));
}

/* Cover spacer pushes content down */
.cover-spacer {
  flex: 1;
}

/* Featured articles */
.cover-articles {
  padding: 16px;
  background: linear-gradient(
    to top,
    rgba(0, 0, 0, 0.75) 0%,
    rgba(0, 0, 0, 0.4) 70%,
    rgba(0, 0, 0, 0) 100%
  );
}

.cover-article {
  font-size: 0.8125rem;
  font-weight: 600;
  color: #fff;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  margin-bottom: 8px;
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.5);
}

.cover-article:last-child {
  margin-bottom: 0;
}

/* Cover meta (edition, date) */
.cover-meta {
  display: flex;
  justify-content: space-between;
  padding: 10px 16px;
  font-size: 0.6875rem;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.8);
  background: rgba(0, 0, 0, 0.6);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ============================================
   CONTENT PAGES
   ============================================ */

/* Section label */
.section-label {
  display: block;
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: #999;
  padding: 16px 16px 8px;
}

/* Page image */
.page-image {
  flex: 1;
  overflow: hidden;
  min-height: 0;
}

.page-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-image.full {
  flex: none;
  height: 55%;
}

/* Page text */
.page-text {
  padding: 16px;
}

.page-text h2 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 8px;
  color: #1a1a1a;
}

.page-text p {
  font-size: 0.9375rem;
  line-height: 1.55;
  color: #444;
  margin-bottom: 12px;
}

.page-text p:last-child {
  margin-bottom: 0;
}

/* Full-page text */
.page-text-full {
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.page-text.centred {
  text-align: center;
  padding: 32px 24px;
}

.page-text.centred p {
  font-size: 1rem;
}

/* Page caption (for images) */
.page-caption {
  padding: 12px 16px;
  background: #f7f7f7;
  border-top: 1px solid #eee;
}

.page-caption p {
  font-size: 0.8125rem;
  line-height: 1.5;
  color: #666;
  margin: 0;
}

/* ============================================
   QUOTE PAGE
   ============================================ */

.page-quote {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 32px 24px;
  text-align: center;
}

.page-quote p {
  font-size: 1.25rem;
  font-style: italic;
  line-height: 1.45;
  color: #1a1a1a;
  margin-bottom: 20px;
}

.page-quote cite {
  font-size: 0.875rem;
  font-style: normal;
  font-weight: 500;
  color: #888;
}

/* ============================================
   CLOSE PAGE
   ============================================ */

.page-close .frame-inner {
  justify-content: center;
  align-items: center;
  text-align: center;
  background: #fafafa;
}

.close-content {
  padding: 32px;
}

.close-message {
  font-size: 1.125rem;
  font-weight: 500;
  color: #1a1a1a;
  margin-bottom: 24px;
}

.close-link {
  margin-bottom: 32px;
}

.close-link a {
  color: var(--frame-colour, #4A90A4);
  text-decoration: none;
  font-weight: 500;
  font-size: 1rem;
}

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

.edition-info {
  font-size: 0.75rem;
  color: #999;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ============================================
   UTILITIES
   ============================================ */

/* Visually hidden but accessible */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ============================================
   REDUCED MOTION
   ============================================ */

@media (prefers-reduced-motion: reduce) {
  .page,
  .progress-bar {
    transition: none;
  }
}

/* ============================================
   PRINT (probably won't use, but nice to have)
   ============================================ */

@media print {
  .magazine {
    position: static;
  }
  
  .progress,
  .nav-hint {
    display: none;
  }
  
  .page {
    position: static;
    opacity: 1;
    visibility: visible;
    page-break-after: always;
  }
}