body {
  font-family: 'Arial', sans-serif;
  margin: 0;
  padding: 0;
  background-color: var(--bg-color);
  color: var(--text-color);
  display: flex;
  flex-direction: column;
  align-items: center;
  overflow-x: hidden;
  transition: background-color 0.3s ease, color 0.3s ease;
}

:root {
  --bg-color: #121212;
  --text-color: #ffffff;
  --icon-color: #ffffff;
  --card-bg-color: #1e1e1e;
  --card-border-color: #333333;
  --btn-bg-color: #007bff;
  --btn-hover-bg-color: #0056b3;
  --delete-btn-bg-color: #ff4d4d;
  --delete-btn-hover-bg-color: #cc0000;
  --edit-btn-bg-color: #ffa500;
  --edit-btn-active-color: #ff4d4d;

  /* --- NEW: Theme-aware card variables --- */
  --card-content-bg: linear-gradient(180deg, rgba(30, 30, 30, 0.0) 0%, rgba(30, 30, 30, 0.7) 20%, rgba(30, 30, 30, 0.85) 100%);
  --card-footer-bg: rgba(20, 20, 20, 0.8);
  --card-content-border: rgba(255, 255, 255, 0.1);
  --text-color-muted: rgb(145, 145, 145);
  --title-color: #ffffff;
}

.light-mode {
  --bg-color: #f4f4f9;
  --text-color: #3e3e3e;
  --icon-color: #333333;
  --card-bg-color: #ffffff;
  --card-border-color: #ddd;
  
  /* --- NEW: Light-mode theme-aware card variables --- */
  --card-content-bg: linear-gradient(180deg, rgba(255, 255, 255, 0.0) 0%, rgba(255, 255, 255, 0.7) 20%, rgba(255, 255, 255, 0.85) 100%);
  --card-footer-bg: rgba(248, 249, 250, 0.8);
  --card-content-border: rgba(0, 0, 0, 0.1);
  --text-color-muted: rgb(80, 80, 80);
  --title-color: var(--text-color);
}

h1 {
  font-size: 2rem;
  margin-top: 20px;
  text-align: center;
  animation: fadeInDown 0.5s ease;
}

#theme-toggle {
  position: fixed;
  bottom: 20px;
  right: 20px;
  background-color: var(--card-bg-color);
  color: var(--text-color);
  font-size: 24px;
  border: none;
  border-radius: 50%;
  width: 50px;
  height: 50px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: 0px 4px 10px rgba(0, 0, 0, 0.2);
  transition: color 0.3s ease, background-color 0.3s ease, transform 0.2s ease;
  z-index: 1000;
}

#theme-toggle:hover {
  transform: scale(1.1);
}

#login-section {
  position: fixed;
  top: 16px;
  right: 16px;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 10px;
  pointer-events: auto;
  z-index: 1;
}

#api-key-input-container {
  position: absolute;
  top: -13px;
  right: 60px;
  display: flex;
  align-items: center;
  gap: 10px;
  background-color: var(--card-bg-color);
  padding: 8px 10px;
  border: 1px solid var(--card-border-color);
  border-radius: 8px;
  width: 300px;
  transform: translateX(90%);
  opacity: 0;
  visibility: hidden;
  transition: transform 0.3s ease, opacity 0.3s ease, visibility 0.3s ease;
}

#api-key-input-container.is-visible {
  opacity: 1;
  transform: translateX(0);
  visibility: visible;
}

#api-key-input {
  flex: 1;
  padding: 6px 10px;
  font-size: 14px;
  border: 1px solid var(--card-border-color);
  border-radius: 5px;
  background-color: var(--card-bg-color);
  color: var(--icon-color);
}

.material-btn {
  background-color: var(--btn-bg-color);
  color: var(--icon-color);
  font-size: 20px;
  border: none;
  border-radius: 50%;
  width: 45px;
  height: 45px;
  display: flex;
  justify-content: center;
  align-items: center;
  cursor: pointer;
  transition: background-color 0.3s ease, transform 0.2s ease;
}

.material-btn:hover {
  background-color: var(--btn-hover-bg-color);
  transform: scale(1.1);
}

#input-section {
  position: relative;
  width: 95%;
  display: flex;
  justify-content: center;
  margin-bottom: 20px;
}

#input-container {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  width: 100%;
  max-width: 100%;
  padding: 0 10px;
  z-index: 2;
  animation: fadeIn 0.5s ease;
}

#link-input {
  position: relative;
  padding: 12px 15px;
  font-size: 16px;
  border: 2px solid var(--card-border-color);
  border-radius: 5px;
  outline: none;
  visibility: visible !important;
  opacity: 1 !important;
  pointer-events: auto !important;
  transition: border-color 0.3s ease;
  background-color: var(--card-bg-color);
  color: var(--icon-color);
  width: 275px;
  box-sizing: border-box;
}

#add-link {
  position: relative;
  background-color: var(--btn-bg-color);
  color: #fff;
  font-size: 18px;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 2;
  transform: scale(1.1);
}

#add-link:hover {
  background-color: var(--btn-hover-bg-color);
}

#edit-toggle {
  background-color: var(--edit-btn-bg-color);
  z-index: 10;
  color: var(--icon-color);
  font-size: 24px;
  border-radius: 50%;
  width: 50px;
  height: 50px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background-color 0.3s ease, color 0.3s ease;
  transform: scale(1.15);
}

body.in-edit-mode #edit-toggle {
  background-color: var(--edit-btn-active-color);
  color: #fff;
}

#grid-section {
  width: 100%;
  display: flex;
  justify-content: center;
}

#grid-container {
  display: grid;
  gap: 20px;
  grid-template-columns: repeat(auto-fit, 240px);
  justify-content: center;
  max-width: 100%;
  padding: 10px;
  align-items: start;
}

.material-spinner {
  display: none;
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 50px;
  height: 50px;
  border-radius: 50%;
  border: 5px solid rgba(0, 0, 0, 0.1);
  border-top-color: #4285f4;
  animation: spin 1s linear infinite;
  z-index: 9999;
}

@keyframes spin {
  0% {
    transform: rotate(0deg);
  }

  100% {
    transform: rotate(360deg);
  }
}

.material-spinner.visible {
  display: block;
}

.link-card {
  position: relative;
  border: 1px solid var(--card-border-color);
  border-radius: 10px;
  overflow: hidden;
  background-color: var(--card-bg-color);
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
  display: flex;
  flex-direction: column;
}

.link-card:hover {
  transform: scale(1.05);
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.3);
  border-color: var(--btn-bg-color);
}

.thumbnail-container {
  position: relative;
  width: 100%;
  height: 180px;
  z-index: 1;
  overflow: hidden;
}

.thumbnail {
  width: 100%;
  height: 100%;
  object-fit: cover;
  position: absolute;
}

.card-content {
  position: relative;
  margin-top: -100px;
  padding: 10px;
  z-index: 2;
  /* --- FIX: Use theme variables --- */
  color: var(--text-color);
  background: var(--card-content-bg);
  border-top: 1px solid var(--card-content-border);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.card-stats {
  padding-bottom: 8px;
}


.footer {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  padding: 8px 10px;
  /* --- FIX: Use theme variables --- */
  background-color: var(--card-footer-bg);
  border-top: 1px solid var(--card-content-border);
  box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.5),
              0 -1px 0 rgba(255, 255, 255, 0.05);
  color: var(--text-color);
  font-size: 0.7rem;
  min-height: 39px;
  box-sizing: border-box;
  margin-top: auto;
  z-index: 3;
}

.footer p {
  margin: 0;
  line-height: 1.2;
  /* --- FIX: Use theme variable --- */
  color: var(--text-color-muted);
  text-shadow: 0 1px 3px rgba(0,0,0,0.4);
}

.footer p strong {
  /* --- FIX: Use theme variable --- */
  color: var(--text-color);
}

.action-buttons {
  display: flex;
  gap: 8px;
}

.action-btn {
  width: 30px;
  height: 30px;
  background-color: var(--btn-bg-color);
  color: var(--icon-color);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  text-decoration: none;
  box-shadow: 0px 4px 10px rgba(0, 0, 0, 0.2);
  transition: transform 0.2s ease, background-color 0.3s ease;
}

.action-btn:hover {
  transform: scale(1.1);
  background-color: var(--btn-hover-bg-color);
}

.action-btn i {
  pointer-events: none;
}

.hyperlinked-title {
  font-size: 0.8rem;
  word-wrap: break-word;
  margin-top: -3px;
  margin-bottom: 4px;
  /* --- FIX: Use theme variable --- */
  color: var(--title-color);
}

.hyperlinked-title a {
  text-decoration: none;
  /* --- FIX: Use theme variable --- */
  color: var(--title-color);
  text-shadow: 0 1px 3px rgba(0,0,0,0.4);
}

.hyperlinked-title a:hover {
  text-decoration: underline;
  color: var(--btn-bg-color);
}

.stats-list {
  list-style: none;
  padding: 0;
  margin: 0;
  font-size: 0.7rem;
  line-height: 1.1;
  text-shadow: 0 1px 3px rgba(0,0,0,0.4);
}

.stats-list li {
  margin-bottom: 3px;
}

.delete-btn {
  position: absolute;
  top: 5px;
  right: 5px;
  background-color: var(--delete-btn-bg-color);
  color: var(--icon-color);
  border: none;
  border-radius: 5px;
  padding: 5px;
  font-size: 0.85rem;
  cursor: pointer;
  z-index: 4;
  opacity: 0;
  visibility: hidden;
  transform: scale(0.9);
  transition: background-color 0.3s ease, transform 0.2s ease, opacity 0.2s ease, visibility 0.2s ease;
}

body.in-edit-mode .link-card .delete-btn {
  opacity: 1;
  visibility: visible;
  transform: scale(1);
}

.delete-btn:hover {
  background-color: var(--delete-btn-hover-bg-color);
  transform: scale(1.1);
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInDown {
  from {
    opacity: 0;
    transform: translateY(-30px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hidden {
  display: none;
}