:root {
  --background-dark: #1a202c;
  --card-background: #2d3748;
  --text-light: #e2e8f0;
  --text-secondary: #a0aec0;
  --accent-blue: #3182ce;
  --accent-red: #e53e3e;
  --accent-green: #38a169;
}

body {
  background-color: var(--background-dark);
  color: var(--text-light);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  margin: 0;
  padding: 2rem;
}

.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2rem;
}

.header h1 {
  margin: 0;
}

#datetime {
  font-size: 1rem;
  color: var(--text-secondary);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 1.5rem;
}

.card {
  background-color: var(--card-background);
  padding: 1.5rem;
  border-radius: 8px;
  text-decoration: none;
  color: var(--text-light);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 20px rgba(0,0,0,0.2);
}

.card h2 {
  margin: 0 0 0.5rem 0;
  font-size: 1.25rem;
}

.card p {
  margin: 0;
  color: var(--text-secondary);
}

/* Quill Editor Dark Theme */
.ql-toolbar {
  background: var(--card-background);
  border: 1px solid var(--text-secondary) !important;
  border-radius: 8px 8px 0 0;
}
.ql-snow .ql-stroke {
  stroke: var(--text-light);
}
.ql-snow .ql-picker-label {
  color: var(--text-light);
}
.ql-container {
  border: 1px solid var(--text-secondary) !important;
  border-radius: 0 0 8px 8px;
}
.ql-editor {
  background: var(--card-background);
  color: var(--text-light);
  min-height: 200px;
}

#save-button, .edit-button, .delete-button {
  background-color: var(--accent-blue);
  color: white;
  border: none;
  padding: 10px 15px;
  border-radius: 5px;
  cursor: pointer;
  margin-top: 1rem;
  font-weight: bold;
  transition: background-color 0.2s ease;
}

#save-button:hover {
  background-color: #2b6cb0;
}

.note {
  background-color: var(--card-background);
  border: 1px solid #4a5568;
  border-radius: .5rem;
  padding: 1.5rem;
  margin-top: 1.5rem;
  color: var(--text-light);
}

.note-date {
  font-size: 0.8em;
  color: var(--text-secondary);
  text-align: right;
  margin-top: 1rem;
}

.note-controls {
    text-align: right;
    margin-top: 1rem;
}

.edit-button, .delete-button {
  padding: 5px 10px;
  margin-left: 10px;
}

.delete-button {
  background-color: var(--accent-red);
}
.delete-button:hover {
  background-color: #c53030;
}

/* Tabs */
.tab-container {
    width: 100%;
}

.tab-buttons {
    display: flex;
    border-bottom: 2px solid var(--card-background);
    margin-bottom: 1rem;
}

.tab-button {
    background: none;
    border: none;
    color: var(--text-secondary);
    padding: 10px 20px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: bold;
    transition: color 0.2s ease, border-bottom 0.2s ease;
    border-bottom: 2px solid transparent;
}

.tab-button.active {
    color: var(--text-light);
    border-bottom: 2px solid var(--accent-blue);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

/* Translator */
.translator-container {
    display: flex;
    gap: 1rem;
    align-items: center;
    margin-bottom: 1rem;
}

.translator-input, .translator-output {
    flex: 1;
    display: flex;
    flex-direction: column;
}

#source-lang, #target-lang {
    background-color: var(--card-background);
    color: var(--text-light);
    border: 1px solid var(--text-secondary);
    border-radius: 5px;
    padding: 5px;
    margin-bottom: 0.5rem;
}

textarea {
    background-color: var(--card-background);
    color: var(--text-light);
    border: 1px solid var(--text-secondary);
    border-radius: 5px;
    padding: 10px;
    min-height: 150px;
    resize: vertical;
    font-family: inherit;
}

#swap-lang-button {
    background: none;
    border: 1px solid var(--text-secondary);
    color: var(--text-light);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    cursor: pointer;
    font-size: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

#translate-button {
    background-color: var(--accent-green);
    width: 100%;
}

#translate-button:hover {
    background-color: #2f855a;
}