/* =========================
   ROOT & THEME
   ========================= */

:root {
  /* Backgrounds */
  --bg-primary: #f4f4f4;

  /* Text */
  --text-focus: #000000;
  --text-muted: #b2b2b2;

  /* Progress */
  --progress-fill: #5fce6a;
  --progress-bg: #b2b2b2;

  /* Accents */
  --accent-primary: #5fce6a;

  /* Typography */
  --font-family: "Montserrat", sans-serif;

  --fw-bold: 700;
  --fw-medium: 500;
  --fw-light: 300;
  --fw-thin: 100;

  --fs-title: 2rem;
  --fs-task: 1.2rem;
  --fs-subtask: 0.8rem;
  --fs-percentage: 1.5rem;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;

  /* Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 30px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
}

/* =========================
   BASE RESET
   ========================= */

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: var(--font-family);
  background-color: #eaeaea;
  transition: background-color var(--transition-normal);
}

/* =========================
   TYPO RESET
   ========================= */

h1,
h2,
p {
  margin: 0;
  padding: 0;
}

/* =========================
   LISTS & BUTTONS
   ========================= */

ul {
  list-style: none;
  padding: 10px 0;
  margin: 0;
}

button {
  border: none;
  background: none;
  cursor: pointer;
  font-family: inherit;
  padding: 0;
  color: inherit;
}

/* =========================
   APP
   ========================= */

.app__header {
  text-align: center;
  width: 100%;
}

.app {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

/* =========================
   TASK LIST
   ========================= */

.task-list {
  background-color: var(--bg-primary);
  padding: 20px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: flex-start;
  width: 28%;
  min-height: 250px;
  margin: 10px;
  border-radius: var(--radius-lg);
  transition: box-shadow var(--transition-normal);
}

.task-list:hover {
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.12);
}

.task-list__footer {
  padding: 5px 0;
  display: flex;
  justify-content: flex-end;
  width: 100%;
  font-weight: var(--fw-light);
}

/* =========================
   PROGRESS
   ========================= */

.progress--global {
  background: var(--progress-bg);
  height: 5px;
  margin: 12px 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  width: 100%;
}

.progress__bar {
  background-color: var(--progress-fill);
  height: 5px;
  width: 80%;
  border-radius: var(--radius-lg);
  transition: width var(--transition-normal);
}

/* =========================
   TEXT SILENCED BY DEFAULT
   ========================= */

.task,
.subtask {
  color: var(--text-muted);
}

/* =========================
   TASK
   ========================= */

.task {
  margin-bottom: var(--space-md);
}

.task__main {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.task__title {
  font-weight: var(--fw-bold);
  font-size: var(--fs-task);
  transition: color var(--transition-fast);
}

/* =========================
   TASK ACTIVE (FOCUS)
   ========================= */

.task--active {
  color: var(--text-focus);
}

.task--active::before {
  content: "";
  position: absolute;
  left: -8px;
  width: 3px;
  height: 100%;
  background: var(--accent-primary);
  border-radius: 2px;
}

.task--active .task__title {
  color: var(--text-focus);
}

/* =========================
   TASK COMPLETED
   ========================= */

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

/* =========================
   ICONS
   ========================= */

.task__toggle {
  cursor: pointer;
  transition: opacity var(--transition-fast);
}

.task__toggle:hover {
  opacity: 0.7;
}

.task__check {
  cursor: pointer;
}

.task__icon,
.subtask__icon {
  font-size: 0.9rem;
  opacity: 0.8;
}

.task__icon--checked,
.subtask__icon--checked {
  display: none;
}

/* Hover preview */
.task__check:hover .task__icon--unchecked,
.subtask__check:hover .subtask__icon--unchecked {
  display: none;
}

.task__check:hover .task__icon--checked,
.subtask__check:hover .subtask__icon--checked {
  display: inline-block;
}

/* Completed icons */
.task--completed .task__icon--unchecked,
.subtask--completed .subtask__icon--unchecked {
  display: none;
}

.task--completed .task__icon--checked,
.subtask--completed .subtask__icon--checked {
  display: inline-block;
}

/* =========================
   SUBTASKS
   ========================= */

.subtask-list {
  padding-left: 20px;
}

.subtask {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-xs);
}

.subtask__title {
  font-size: var(--fs-subtask);
  font-weight: var(--fw-medium);
  transition: color var(--transition-fast);
}

/* Subtasks follow task focus */
.task--active .subtask__title {
  color: var(--text-focus);
}

/* Subtask completed */
.subtask--completed .subtask__title {
  text-decoration: line-through;
  color: var(--text-muted);
}

/* =========================
   ADD BUTTONS
   ========================= */

.subtask-list__add-btn {
  font-family: var(--font-family);
  font-weight: var(--fw-medium);
  color: var(--text-muted);
  transition: color var(--transition-fast);
}

.subtask-list__add-btn:hover {
  color: var(--text-focus);
}

.task-list__add-btn-1 {
  display: flex;
  font-family: var(--font-family);
  font-weight: var(--fw-bold);
  font-size: var(--fs-task);
  color: var(--text-muted);
  transition: color var(--transition-fast);
}

.task-list__add-btn-1:hover {
  color: var(--text-focus);
}

.task-list__add-btn-2 {
  color: var(--progress-bg);
  font-size: var(--fs-task);
  background: var(--bg-primary);
  padding: 10px 12px;
  border-radius: var(--radius-lg);
  transition:
    background-color var(--transition-normal),
    color var(--transition-normal),
    transform var(--transition-fast);
}

.task-list__add-btn-2:hover {
  background-color: var(--accent-primary);
  color: white;
  transform: scale(1.05);
}

.subtask-list {
  display: none;
}

.subtask-list--expanded {
  display: block;
}

.add-objective {
  display: flex;
  justify-content: center;
  margin: var(--space-lg) 0;
}

.task-list__add-btn-2 {
  display: flex;
  align-items: center;
  justify-content: center;
}

/* =========================
   NIGHT MODE
   ========================= */

body.theme--night {
  --bg-primary: #161824;

  --text-focus: #e9e9ff;
  --text-muted: #6f6bbd;

  --progress-fill: #9556eb;
  --progress-bg: #3b3089;

  --accent-primary: #9556eb;

  background-color: #0f1020;
}

.theme-toggle {
  margin-left: var(--space-md);
  font-size: 1.2rem;
  color: var(--text-muted);
  transition:
    color var(--transition-fast),
    transform var(--transition-fast);
}

.theme-toggle:hover {
  color: var(--text-focus);
  transform: rotate(-10deg);
}

body.theme--night .theme-toggle i {
  color: var(--accent-primary);
}