/* styles/Updates.css
   Colors: blue (#0b74ff), darker blue (#04518a), yellow (#f2c200), black and white
   Matching the QuestionPapers.css pattern
*/

:root {
  --upd-bg: #ffffff;
  --upd-text: #0b0b0b;
  --upd-text-light: rgba(11, 11, 11, 0.6);
  --upd-blue: #0b74ff;
  --upd-blue-dark: #04518a;
  --upd-yellow: #f2c200;
  --upd-border: rgba(4, 81, 138, 0.08);
  --upd-shadow-sm: 0 2px 8px rgba(4, 81, 138, 0.04);
  --upd-shadow-md: 0 4px 16px rgba(4, 81, 138, 0.06);
  --upd-shadow-lg: 0 8px 24px rgba(4, 81, 138, 0.08);
  --upd-radius: 10px;
  --upd-ease: cubic-bezier(0.2, 0.9, 0.3, 1);
}

/* ============================================
   Page Container
   ============================================ */

.upd-page-container {
  background: var(--upd-bg);
  color: var(--upd-text);
  min-height: 100vh;
  font-family: Inter, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ============================================
   Header Icon
   ============================================ */

.upd-header {
  display: flex;
  justify-content: flex-start;
  align-items: center;
  padding: 18px 28px 0 28px;
}

.upd-header-icon {
  color: var(--upd-blue);
  font-size: 36px;
  opacity: 0.92;
  animation: upd-icon-pop 420ms var(--upd-ease) both;
}

/* ============================================
   Main Content
   ============================================ */

.upd-main {
  width: 94%;
  max-width: 1200px;
  margin: 12px auto 48px;
  padding: 0 18px;
  box-sizing: border-box;
}

/* ============================================
   Intro Card
   ============================================ */

.upd-intro-card {
  background: #fff;
  border: 1px solid var(--upd-border);
  border-left: 4px solid var(--upd-blue);
  border-radius: var(--upd-radius);
  padding: 18px 20px;
  margin-bottom: 20px;
  box-shadow: var(--upd-shadow-sm);
  animation: upd-card-appear 420ms var(--upd-ease) both;
}

.upd-title {
  color: var(--upd-blue);
  font-size: 28px;
  font-weight: 700;
  margin: 0 0 6px 0;
  line-height: 1.1;
}

.upd-subtitle {
  color: var(--upd-text-light);
  font-size: 15px;
  margin: 0;
  line-height: 1.5;
}

/* ============================================
   Updates List
   ============================================ */

.upd-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

/* ============================================
   Update Card
   ============================================ */

.upd-card {
  background: #fff;
  border: 1px solid var(--upd-border);
  border-radius: var(--upd-radius);
  padding: 16px 18px;
  box-shadow: var(--upd-shadow-sm);
  transition: all 280ms var(--upd-ease);
  animation: upd-card-appear 420ms var(--upd-ease) both;
}

.upd-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--upd-shadow-lg);
  border-color: var(--upd-blue);
}

/* Card Header */
.upd-card-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 12px;
}

.upd-avatar {
  width: 48px;
  height: 48px;
  border-radius: 8px;
  object-fit: cover;
  border: 2px solid var(--upd-border);
  flex-shrink: 0;
  transition: all 220ms var(--upd-ease);
}

.upd-card:hover .upd-avatar {
  border-color: var(--upd-blue);
}

.upd-user-info {
  flex: 1;
  min-width: 0;
}

.upd-user-name {
  display: flex;
  align-items: center;
  gap: 6px;
  font-weight: 600;
  font-size: 15px;
  color: var(--upd-text);
  margin-bottom: 4px;
}

.upd-user-icon {
  color: var(--upd-blue);
  font-size: 14px;
  flex-shrink: 0;
}

.upd-usn {
  color: var(--upd-text-light);
  font-weight: 400;
}

.upd-user-title {
  color: var(--upd-text-light);
  font-size: 14px;
  line-height: 1.4;
}

.upd-timestamp {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--upd-text-light);
  font-size: 13px;
  white-space: nowrap;
  flex-shrink: 0;
}

.upd-time-icon {
  font-size: 13px;
  color: var(--upd-blue);
}

/* Card Content */
.upd-content {
  color: var(--upd-text);
  font-size: 15px;
  line-height: 1.6;
  margin: 0 0 12px 0;
}

/* ============================================
   Links Section
   ============================================ */

.upd-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
}

.upd-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: 6px;
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
  transition: all 220ms var(--upd-ease);
  white-space: nowrap;
}

.upd-link-internal {
  background: rgba(11, 116, 255, 0.08);
  color: var(--upd-blue);
  border: 1px solid rgba(11, 116, 255, 0.2);
}

.upd-link-internal:hover {
  background: var(--upd-blue);
  color: white;
  border-color: var(--upd-blue);
  transform: translateX(2px);
}

.upd-link-external {
  background: rgba(242, 194, 0, 0.08);
  color: var(--upd-yellow);
  border: 1px solid rgba(242, 194, 0, 0.2);
}

.upd-link-external:hover {
  background: var(--upd-yellow);
  color: var(--upd-text);
  border-color: var(--upd-yellow);
  transform: translateX(2px);
}

.upd-link-icon {
  font-size: 14px;
  transition: transform 220ms var(--upd-ease);
}

.upd-link:hover .upd-link-icon {
  transform: translateX(2px);
}

/* ============================================
   Empty State
   ============================================ */

.upd-empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 48px 24px;
  background: #f8fafc;
  border-radius: var(--upd-radius);
  border: 1px dashed var(--upd-border);
  animation: upd-fade-in 420ms var(--upd-ease) both;
}

.upd-empty-icon {
  font-size: 48px;
  color: var(--upd-blue);
  opacity: 0.4;
  margin-bottom: 12px;
}

.upd-empty-text {
  color: var(--upd-text-light);
  font-size: 15px;
  margin: 0;
}

/* ============================================
   Load More Button
   ============================================ */

.upd-load-more-container {
  display: flex;
  justify-content: center;
  margin-top: 24px;
}

.upd-load-more-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  background: var(--upd-blue);
  color: white;
  border: none;
  border-radius: 8px;
  font-family: inherit;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: all 220ms var(--upd-ease);
  box-shadow: var(--upd-shadow-sm);
}

.upd-load-more-btn:hover:not(:disabled) {
  background: var(--upd-blue-dark);
  transform: translateY(-2px);
  box-shadow: var(--upd-shadow-md);
}

.upd-load-more-btn:active:not(:disabled) {
  transform: scale(0.98);
}

.upd-load-more-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.upd-btn-icon {
  font-size: 16px;
  transition: transform 220ms var(--upd-ease);
}

.upd-load-more-btn:hover:not(:disabled) .upd-btn-icon {
  transform: translateX(3px);
}

/* Loading Spinner */
.upd-spinner {
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top-color: white;
  border-radius: 50%;
  animation: upd-spin 600ms linear infinite;
}

/* ============================================
   Skeleton Loading
   ============================================ */

.upd-skeleton {
  pointer-events: none;
  animation: upd-pulse 1.5s ease-in-out infinite;
}

.upd-skeleton-avatar {
  width: 48px;
  height: 48px;
  border-radius: 8px;
  background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
  background-size: 200% 100%;
  animation: upd-shimmer 1.5s ease-in-out infinite;
  flex-shrink: 0;
}

.upd-skeleton-text-group {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.upd-skeleton-line {
  height: 14px;
  border-radius: 4px;
  background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
  background-size: 200% 100%;
  animation: upd-shimmer 1.5s ease-in-out infinite;
}

.upd-skeleton-name {
  width: 180px;
  height: 16px;
}

.upd-skeleton-title {
  width: 140px;
}

.upd-skeleton-content {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 12px;
}

.upd-skeleton-text {
  width: 100%;
}

.upd-skeleton-text-short {
  width: 70%;
}

/* ============================================
   Animations
   ============================================ */

@keyframes upd-card-appear {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes upd-icon-pop {
  from {
    transform: scale(0.95) translateY(6px);
    opacity: 0;
  }
  to {
    transform: scale(1) translateY(0);
    opacity: 1;
  }
}

@keyframes upd-fade-in {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes upd-spin {
  to {
    transform: rotate(360deg);
  }
}

@keyframes upd-shimmer {
  0% {
    background-position: 200% 0;
  }
  100% {
    background-position: -200% 0;
  }
}

@keyframes upd-pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.6;
  }
}

/* ============================================
   Responsive Styles
   ============================================ */

/* Very small screens */
@media (max-width: 500px) {
  .upd-main {
    width: 100%;
    padding: 0 12px;
  }

  .upd-header {
    padding: 12px 16px 0 16px;
  }

  .upd-header-icon {
    font-size: 28px;
  }

  .upd-intro-card {
    padding: 14px 16px;
    border-radius: 8px;
  }

  .upd-title {
    font-size: 22px;
  }

  .upd-subtitle {
    font-size: 14px;
  }

  .upd-card {
    padding: 12px 14px;
    border-radius: 8px;
  }

  .upd-card-header {
    flex-wrap: wrap;
    gap: 10px;
  }

  .upd-avatar {
    width: 42px;
    height: 42px;
  }

  .upd-timestamp {
    width: 100%;
    justify-content: flex-start;
    margin-left: 52px;
    font-size: 12px;
  }

  .upd-user-name {
    font-size: 14px;
  }

  .upd-user-title {
    font-size: 13px;
  }

  .upd-content {
    font-size: 14px;
  }

  .upd-link {
    font-size: 13px;
    padding: 5px 10px;
  }

  .upd-load-more-btn {
    font-size: 14px;
    padding: 10px 20px;
  }
}

/* Small screens */
@media (min-width: 501px) and (max-width: 768px) {
  .upd-main {
    width: 96%;
    padding: 0 14px;
  }

  .upd-card-header {
    gap: 12px;
  }

  .upd-timestamp {
    font-size: 12px;
  }
}

/* Medium screens */
@media (min-width: 769px) and (max-width: 1024px) {
  .upd-main {
    width: 92%;
  }
}

/* Large screens */
@media (min-width: 1200px) {
  .upd-main {
    width: 90%;
    max-width: 1400px;
  }

  .upd-card {
    padding: 20px 22px;
  }

  .upd-card-header {
    gap: 16px;
  }

  .upd-avatar {
    width: 52px;
    height: 52px;
  }
}

/* ============================================
   Accessibility & Performance
   ============================================ */

/* Focus states */
.upd-link:focus,
.upd-load-more-btn:focus {
  outline: 3px solid rgba(11, 116, 255, 0.3);
  outline-offset: 2px;
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* High contrast mode */
@media (prefers-contrast: high) {
  .upd-card,
  .upd-intro-card {
    border-width: 2px;
    border-color: #000;
  }

  .upd-link {
    border-width: 2px;
  }
}

/* Print styles */
@media print {
  .upd-page-container {
    background: white;
  }

  .upd-card {
    box-shadow: none;
    border: 1px solid #ccc;
    break-inside: avoid;
    animation: none;
    transform: none;
  }

  .upd-load-more-container {
    display: none;
  }
}

/* ============================================
   Files Section — append to Updates.css
   ============================================ */

.upd-files {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--upd-border);
}

/* Base file card */
.upd-file-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 14px;
  background: rgba(11, 116, 255, 0.02);
  border: 1px solid var(--upd-border);
  border-radius: 8px;
  transition: all 220ms var(--upd-ease);
}

.upd-file-card:hover {
  background: rgba(11, 116, 255, 0.05);
  border-color: rgba(11, 116, 255, 0.25);
  transform: translateX(3px);
}

/* File name area → opens Drive viewer on click */
.upd-file-card-name {
  display: flex;
  align-items: center;
  gap: 9px;
  text-decoration: none;
  flex: 1;
  min-width: 0;
}

.upd-file-card-icon {
  font-size: 16px;
  flex-shrink: 0;
  line-height: 1;
}

.upd-file-card-label {
  font-size: 13px;
  font-weight: 500;
  color: var(--upd-text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  transition: color 180ms var(--upd-ease);
}

.upd-file-card-name:hover .upd-file-card-label {
  color: var(--upd-blue);
}

/* Image variant */
.upd-file-card-image {
  padding: 8px 14px 8px 8px;
}

.upd-file-thumb-link {
  display: block;
  border-radius: 6px;
  overflow: hidden;
  flex-shrink: 0;
  border: 1px solid var(--upd-border);
  transition: border-color 220ms var(--upd-ease);
}

.upd-file-card-image:hover .upd-file-thumb-link {
  border-color: var(--upd-blue);
}

.upd-file-thumb-img {
  display: block;
  width: 52px;
  height: 52px;
  object-fit: cover;
  transition: transform 300ms var(--upd-ease);
}

.upd-file-card-image:hover .upd-file-thumb-img {
  transform: scale(1.06);
}

/* Action buttons */
.upd-file-card-actions {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
}

.upd-file-action-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 7px;
  border: 1px solid transparent;
  text-decoration: none;
  font-size: 15px;
  transition: all 200ms var(--upd-ease);
}

/* View → blue */
.upd-file-action-view {
  background: rgba(11, 116, 255, 0.08);
  color: var(--upd-blue);
  border-color: rgba(11, 116, 255, 0.2);
}

.upd-file-action-view:hover {
  background: var(--upd-blue);
  color: white;
  border-color: var(--upd-blue);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(11, 116, 255, 0.3);
}

/* Download → yellow */
.upd-file-action-download {
  background: rgba(242, 194, 0, 0.1);
  color: #b38f00;
  border-color: rgba(242, 194, 0, 0.25);
}

.upd-file-action-download:hover {
  background: var(--upd-yellow);
  color: var(--upd-text);
  border-color: var(--upd-yellow);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(242, 194, 0, 0.3);
}

.upd-file-action-btn:active {
  transform: scale(0.94);
}

/* Focus */
.upd-file-action-btn:focus {
  outline: 3px solid rgba(11, 116, 255, 0.3);
  outline-offset: 2px;
}

/* Responsive */
@media (max-width: 500px) {
  .upd-file-card {
    padding: 9px 11px;
  }

  .upd-file-card-label {
    font-size: 12px;
  }

  .upd-file-thumb-img {
    width: 42px;
    height: 42px;
  }

  .upd-file-action-btn {
    width: 28px;
    height: 28px;
    font-size: 14px;
  }
}

/* ============================================
   Files Section — append to Updates.css
   ============================================ */

.upd-files {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--upd-border);
}

/* Base file card */
.upd-file-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 14px;
  background: rgba(11, 116, 255, 0.02);
  border: 1px solid var(--upd-border);
  border-radius: 8px;
  transition: all 220ms var(--upd-ease);
}

.upd-file-card:hover {
  background: rgba(11, 116, 255, 0.05);
  border-color: rgba(11, 116, 255, 0.25);
  transform: translateX(3px);
}

/* File name area → opens Drive viewer on click */
.upd-file-card-name {
  display: flex;
  align-items: center;
  gap: 9px;
  text-decoration: none;
  flex: 1;
  min-width: 0;
}

.upd-file-card-icon {
  font-size: 16px;
  flex-shrink: 0;
  line-height: 1;
}

.upd-file-card-label {
  font-size: 13px;
  font-weight: 500;
  color: var(--upd-text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  transition: color 180ms var(--upd-ease);
}

.upd-file-card-name:hover .upd-file-card-label {
  color: var(--upd-blue);
}

/* Action buttons */
.upd-file-card-actions {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
}

.upd-file-action-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 7px;
  border: 1px solid transparent;
  text-decoration: none;
  font-size: 15px;
  transition: all 200ms var(--upd-ease);
}

/* View → blue */
.upd-file-action-view {
  background: rgba(11, 116, 255, 0.08);
  color: var(--upd-blue);
  border-color: rgba(11, 116, 255, 0.2);
}

.upd-file-action-view:hover {
  background: var(--upd-blue);
  color: white;
  border-color: var(--upd-blue);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(11, 116, 255, 0.3);
}

/* Download → yellow */
.upd-file-action-download {
  background: rgba(242, 194, 0, 0.1);
  color: #b38f00;
  border-color: rgba(242, 194, 0, 0.25);
}

.upd-file-action-download:hover {
  background: var(--upd-yellow);
  color: var(--upd-text);
  border-color: var(--upd-yellow);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(242, 194, 0, 0.3);
}

.upd-file-action-btn:active {
  transform: scale(0.94);
}

/* Focus */
.upd-file-action-btn:focus {
  outline: 3px solid rgba(11, 116, 255, 0.3);
  outline-offset: 2px;
}

/* Responsive */
@media (max-width: 500px) {
  .upd-file-card {
    padding: 9px 11px;
  }

  .upd-file-card-label {
    font-size: 12px;
  }

  .upd-file-action-btn {
    width: 28px;
    height: 28px;
    font-size: 14px;
  }
}