/* === Reset & Base === */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: var(--tg-theme-bg-color, #fff);
  --text: var(--tg-theme-text-color, #222);
  --hint: var(--tg-theme-hint-color, #999);
  --link: var(--tg-theme-link-color, #2481cc);
  --button: var(--tg-theme-button-color, #2481cc);
  --button-text: var(--tg-theme-button-text-color, #fff);
  --secondary-bg: var(--tg-theme-secondary-bg-color, #f4f4f5);
  --section-bg: var(--tg-theme-section-bg-color, #fff);
  --danger: #e74c3c;
}

html, body {
  height: 100%;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

body {
  padding: 16px;
  overflow-y: auto;
}

/* === App Shell === */
#app {
  max-width: 560px;
  margin: 0 auto;
}

header h1 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 8px;
}

/* === Stats === */
#task-stats {
  display: flex;
  gap: 16px;
  font-size: 14px;
  color: var(--hint);
  margin-bottom: 16px;
}

/* === Input Row === */
#task-input-row {
  display: flex;
  gap: 8px;
  margin-bottom: 12px;
}

#task-input {
  flex: 1;
  min-width: 0;
  padding: 12px 14px;
  border: 1px solid var(--hint);
  border-radius: 12px;
  font-size: 16px;
  background: var(--secondary-bg);
  color: var(--text);
  outline: none;
  transition: border-color 0.15s;
}
#task-input:focus {
  border-color: var(--button);
}

#task-date {
  padding: 10px;
  border: 1px solid var(--hint);
  border-radius: 12px;
  font-size: 14px;
  background: var(--secondary-bg);
  color: var(--text);
  outline: none;
  cursor: pointer;
  flex-shrink: 0;
  width: 120px;
  transition: border-color 0.15s;
}
#task-date:focus {
  border-color: var(--button);
}
#task-date::-webkit-calendar-picker-indicator {
  filter: invert(0.5);
  cursor: pointer;
}

#task-add-btn {
  width: 48px;
  height: 48px;
  border: none;
  border-radius: 12px;
  background: var(--button);
  color: var(--button-text);
  font-size: 24px;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: opacity 0.15s;
}
#task-add-btn:active {
  opacity: 0.7;
}

/* === Filters === */
#task-filters {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
}

.filter-btn {
  padding: 6px 14px;
  border: 1px solid var(--hint);
  border-radius: 20px;
  background: transparent;
  color: var(--hint);
  font-size: 14px;
  cursor: pointer;
  transition: all 0.15s;
}
.filter-btn.active {
  background: var(--button);
  color: var(--button-text);
  border-color: var(--button);
}

/* === Task List === */
#task-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 16px;
}

.task-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  background: var(--secondary-bg);
  border-radius: 12px;
  transition: opacity 0.2s;
  animation: slideIn 0.2s ease-out;
}

@keyframes slideIn {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: translateY(0); }
}

.task-item.done .task-text {
  text-decoration: line-through;
  opacity: 0.5;
}

.task-checkbox {
  width: 22px;
  height: 22px;
  border: 2px solid var(--hint);
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: all 0.15s;
  background: transparent;
  color: transparent;
  font-size: 14px;
}
.task-checkbox.checked {
  background: var(--button);
  border-color: var(--button);
  color: var(--button-text);
}

.task-text {
  flex: 1;
  word-break: break-word;
}

.task-date {
  font-size: 12px;
  color: var(--hint);
  margin-top: 2px;
  display: inline-block;
}
.task-date.overdue {
  color: var(--danger);
}
.task-date.today {
  color: var(--button);
  font-weight: 600;
}

.task-delete {
  width: 28px;
  height: 28px;
  border: none;
  border-radius: 8px;
  background: transparent;
  color: var(--hint);
  font-size: 16px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: color 0.15s;
}
.task-delete:active {
  color: var(--danger);
}

/* === Empty State === */
#empty-state {
  text-align: center;
  padding: 48px 0;
  color: var(--hint);
}
#empty-state p:first-child { font-size: 20px; margin-bottom: 4px; }
#empty-state .hint { font-size: 14px; }

.hidden { display: none !important; }

/* === Clear Done === */
#clear-row {
  display: flex;
  justify-content: center;
  margin-top: 8px;
}

#clear-done-btn {
  padding: 8px 18px;
  border: 1px solid var(--danger);
  border-radius: 20px;
  background: transparent;
  color: var(--danger);
  font-size: 14px;
  cursor: pointer;
  transition: all 0.15s;
}
#clear-done-btn:active {
  background: var(--danger);
  color: var(--button-text);
}