/* ===== RESET & BASE ===== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-primary);
  background-color: var(--color-bg);
  color: var(--color-white);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: var(--spacing-2xl) var(--spacing-md);
}

/* ===== HEADER ===== */
header {
  text-align: center;
  margin-bottom: var(--spacing-xl);
}

header h1 {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  letter-spacing: 3px;
  color: var(--color-white);
  margin-bottom: var(--spacing-xs);
}

header p {
  color: rgba(255, 255, 255, 0.7);
  font-size: var(--font-size-sm);
  letter-spacing: 1px;
}

/* ===== INPUT SECTION ===== */
.input-section {
  display: flex;
  gap: var(--spacing-sm);
  width: 100%;
  max-width: 600px;
  margin-bottom: var(--spacing-xl);
}

.input-section input {
  flex: 1;
  padding: var(--spacing-md) var(--spacing-lg);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-burgundy);
  font-family: var(--font-primary);
  font-size: var(--font-size-sm);
  outline: none;
  transition: border-color var(--transition-normal);
}

.input-section input:focus {
  border-color: var(--color-burgundy);
}

.input-section input::placeholder {
  color: var(--color-text-muted);
}

.input-section button {
  padding: var(--spacing-md) var(--spacing-lg);
  background: #000;
  color: var(--color-white);
  border: none;
  border-radius: var(--radius-md);
  font-family: var(--font-primary);
  font-size: var(--font-size-sm);
  font-weight: 700;
  letter-spacing: 1px;
  cursor: pointer;
  transition: background var(--transition-normal),
              transform var(--transition-normal);
}

.input-section button:hover {
  background: var(--color-burgundy-hover);
  transform: translateY(-2px);
}

/* ===== TASKS SECTION ===== */
.tasks-section {
  width: 100%;
  max-width: 600px;
  background: var(--color-bg-secondary);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
}

/* ===== FILTER BUTTONS ===== */
.filter-btns {
  display: flex;
  border-bottom: 1px solid var(--color-border);
  color: #555555;
}

.filter-btn {
  flex: 1;
  padding: var(--spacing-md);
  background: transparent;
  border: none;
  color: var(--color-text-muted);
  font-family: var(--font-primary);
  font-size: var(--font-size-sm);
  cursor: pointer;
  transition: color var(--transition-normal),
              background var(--transition-normal);
  letter-spacing: 1px;
}

.filter-btn:hover {
  color: var(--color-burgundy);
  background: var(--color-bg-card);
}

.filter-btn.active {
  color: var(--color-burgundy);
  border-bottom: 2px solid var(--color-burgundy);
  font-weight: 700;
}

/* ===== TASK LIST ===== */
.task-list {
  list-style: none;
  min-height: 200px;
}

.task-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-md) var(--spacing-lg);
  border-bottom: 1px solid var(--color-border);
  transition: background var(--transition-normal);
}

.task-item:hover {
  background: var(--color-bg-card);
}

/* Checkbox */
.task-checkbox {
  width: 20px;
  height: 20px;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: border-color var(--transition-normal),
              background var(--transition-normal);
}

.task-checkbox.checked {
  background: var(--color-burgundy);
  border-color: var(--color-burgundy);
}

.task-checkbox.checked::after {
  content: '✓';
  color: var(--color-white);
  font-size: 12px;
}

/* Task Text */
.task-text {
  flex: 1;
  font-size: var(--font-size-sm);
  color: #000;
  transition: color var(--transition-normal);
}

.task-text.completed {
  text-decoration: line-through;
  color: var(--color-text-muted);
}

/* Delete Button */
.delete-btn {
  background: transparent;
  border: none;
  color: var(--color-text-muted);
  cursor: pointer;
  font-size: var(--font-size-md);
  padding: var(--spacing-xs);
  transition: color var(--transition-normal);
}

.task-item:hover .delete-btn {
  opacity: 1;
}

.delete-btn:hover {
  color: var(--color-burgundy);
}

/* Empty State */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-2xl);
  color: var(--color-text-muted);
  gap: var(--spacing-md);
}

.empty-state i {
  font-size: 2rem;
}

.empty-state p {
  font-size: var(--font-size-sm);
  letter-spacing: 1px;
}

/* ===== TASKS FOOTER ===== */
.tasks-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-md) var(--spacing-lg);
  border-top: 1px solid var(--color-border);
}

#task-count {
  color: var(--color-text-muted);
  font-size: var(--font-size-xs);
  letter-spacing: 1px;
}

.tasks-footer button {
  background: transparent;
  border: none;
  color: var(--color-text-muted);
  font-family: var(--font-primary);
  font-size: var(--font-size-xs);
  cursor: pointer;
  letter-spacing: 1px;
  transition: color var(--transition-normal);
}

.tasks-footer button:hover {
  color: var(--color-burgundy);
}