/* styles.css */
:root {
  --bg-color: var(--tg-theme-bg-color, #f0f2f5);
  --secondary-bg-color: var(--tg-theme-secondary-bg-color, #e4e6eb);
  --text-color: var(--tg-theme-text-color, #000000);
  --hint-color: var(--tg-theme-hint-color, #777);
  --link-color: var(--tg-theme-link-color, #2196f3);
  --button-color: var(--tg-theme-button-color, #4caf50);
  --button-text-color: var(--tg-theme-button-text-color, #ffffff);
  --header-bg: var(--tg-theme-header-bg-color, #ffffff);
  --section-separator-color: var(--tg-theme-section-separator-color, #ccc);
}

* {
  box-sizing: border-box;
}

body { 
  font-family: system-ui, sans-serif; 
  margin: 0; 
  background: var(--bg-color); 
  color: var(--text-color); 
  padding-bottom: env(safe-area-inset-bottom);
}
header {
  padding: 1rem;
  background: var(--header-bg);
  border-bottom: 1px solid var(--section-separator-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: sticky;
  top: 0;
  z-index: 50;
}
#btn-open-create { padding: 0.5rem 1rem; background: var(--button-color); color: var(--button-text-color); border: none; border-radius: 4px; cursor: pointer; font-weight: bold; }
#btn-open-create:hover { opacity: 0.8; }
h1, h2 { margin: 0; }
.board { display: flex; gap: 1rem; padding: 1rem; height: calc(100vh - 100px); overflow-x: auto; }
.column {
  background: var(--secondary-bg-color);
  border-radius: 8px;
  width: 300px;
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  max-height: 100%;
}
.column-header-area {
  flex-shrink: 0;
  padding: 0.5rem;
  background: var(--secondary-bg-color);
  border-bottom: 1px solid var(--section-separator-color);
  z-index: 10;
  min-height: 180px; /* Ensure consistent base height */
}
.column h2 { 
  padding: 0.5rem 1rem; 
  font-size: 1rem; 
  color: var(--hint-color); 
  height: 3rem;
  display: flex;
  align-items: center;
  margin: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.cards { flex: 1; padding: 0 0.5rem 1rem; overflow-y: auto; min-height: 50px; }

.card { 
  background: var(--header-bg); 
  padding: 1rem; 
  border-radius: 6px; 
  box-shadow: 0 1px 2px rgba(0,0,0,0.1); 
  margin-bottom: 0.5rem; 
  cursor: pointer; 
  color: var(--text-color);
  border: 1px solid transparent;
  position: relative; /* For delete button positioning */
}
.btn-delete-task-global {
  position: absolute;
  top: 0.5rem;
  right: 0.5rem;
  opacity: 0;
  cursor: pointer;
  background: none;
  border: none;
  color: var(--hint-color);
  font-size: 0.8rem;
  padding: 4px;
  transition: opacity 0.2s;
  z-index: 10;
}
.card:hover .btn-delete-task-global {
  opacity: 0.6;
}
.btn-delete-task-global:hover {
  opacity: 1 !important;
  color: #d32f2f;
}
.card.placeholder {
  background: rgba(0, 0, 0, 0.03); /* Very subtle fill */
  box-shadow: none;
  border: 2px dashed var(--section-separator-color);
  opacity: 0.6;
  cursor: default;
  pointer-events: none;
  border-radius: 6px;
}
.card[draggable="true"], .subtask-card[draggable="true"] {
  touch-action: none; /* Essential for polyfill */
}
.card-title {
  font-weight: bold;
  margin-bottom: 0.5rem;
  display: -webkit-box;
  -webkit-line-clamp: 2; /* Limit to 2 lines */
  -webkit-box-orient: vertical;
  overflow: hidden;
  text-overflow: ellipsis;
  height: 2.8em; /* Fixed height for 2 lines */
  line-height: 1.4em;
  transition: height 0.3s ease;
}

.card.expanded .card-title {
  display: block;
  height: auto;
  max-height: 1000px; /* Allow full height */
  overflow: visible;
}
.card-track { font-size: 0.8rem; color: var(--hint-color); display: flex; flex-wrap: wrap; gap: 4px; align-items: center; }
.stage { color: var(--hint-color); opacity: 0.8; }
.stage.active { background: var(--link-color); color: var(--button-text-color); padding: 2px 6px; border-radius: 4px; font-weight: bold; }
.stage.deferred { background: #ffebee; color: #d32f2f; padding: 2px 6px; border-radius: 4px; font-weight: bold; }

.modal { position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: var(--bg-color); z-index: 100; display: flex; flex-direction: column; color: var(--text-color); }
.modal.hidden { display: none; }
.modal-header { 
  padding: 1rem; 
  padding-top: calc(1rem + env(safe-area-inset-top));
  background: var(--header-bg); 
  border-bottom: 1px solid var(--section-separator-color); 
  display: flex; 
  align-items: center; 
  gap: 1rem; 
}
#btn-close-modal { cursor: pointer; padding: 0.5rem 1rem; border: none; background: var(--secondary-bg-color); color: var(--text-color); border-radius: 4px; }

/* Sub-task styles */
.subtask-card { 
  background: var(--header-bg); 
  padding: 0.75rem 0.5rem; 
  border-radius: 4px; 
  border: 1px solid var(--section-separator-color); 
  margin-bottom: 0.4rem; 
  display: flex; 
  align-items: center; 
  gap: 0.5rem; 
  font-size: 0.9rem;
  cursor: move;
  color: var(--text-color);
  position: relative;
  justify-content: space-between; /* To push delete button to the right */
}
.subtask-card input[type="checkbox"] { cursor: pointer; }
.subtask-card.completed { opacity: 0.6; text-decoration: line-through; }

.btn-delete-subtask {
  opacity: 0;
  cursor: pointer;
  background: none;
  border: none;
  color: var(--hint-color);
  font-size: 0.8rem;
  padding: 4px;
  transition: opacity 0.2s;
}
.subtask-card:hover .btn-delete-subtask {
  opacity: 1;
}
.btn-delete-subtask:hover {
  color: #d32f2f;
}

.add-subtask { 
  margin-top: 0.5rem; 
  margin-bottom: 0.2rem;
  display: flex; 
  gap: 0.2rem; 
}
.add-subtask input { 
  flex: 1; 
  padding: 0.3rem; 
  font-size: 0.8rem; 
  border: 1px solid var(--section-separator-color); 
  border-radius: 3px;
  background: var(--bg-color);
  color: var(--text-color);
}
.add-subtask button { 
  padding: 0.2rem 0.5rem; 
  background: var(--button-color); 
  color: var(--button-text-color); 
  border: none; 
  border-radius: 3px; 
  cursor: pointer;
}

.hidden { display: none !important; }

@media (max-width: 600px) {
  .board {
    scroll-snap-type: x mandatory;
    gap: 0.5rem;
    padding: 0.5rem;
    height: calc(100vh - 120px);
  }
  .column {
    width: calc(100vw - 2rem);
    scroll-snap-align: center;
  }
  .card {
    padding: 1.25rem 1rem;
  }
  #btn-open-create, #btn-close-modal {
    padding: 0.75rem 1.25rem;
  }
  .add-subtask input {
    padding: 0.5rem;
  }
  .add-subtask button {
    padding: 0.5rem 1rem;
  }
}