/* Reset */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* Variables (Design System) */
:root {
    --bg: #0f172a;
    --card: #111827;
    --primary: #6366f1;
    --primary-hover: #4f46e5;
    --danger: #ef4444;
    --success: #22c55e;
    --text: #e5e7eb;
    --muted: #9ca3af;
    --border: rgba(255, 255, 255, 0.08);
    --radius: 14px;
}
ul{
    padding: 0;
    margin: 0;
}

/* Body */
body {
    min-height: 100vh;
    background: linear-gradient(135deg, #0f172a, #020617);
    font-family: 'Segoe UI', sans-serif;
    color: var(--text);
}

/* App Container */
.todo_app {
    background: var(--card);
    border-radius: var(--radius);
    padding: 30px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(10px);
    transition: 0.3s;
}

/* .todo_app:hover {
    transform: translateY(-5px);
} */

/* Header */
.todo_app_header h1 {
    font-weight: 700;
    letter-spacing: 1px;
}

/* Input */
.input-group input {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text);
    border-radius: var(--radius) 0 0 var(--radius);
}

.input-group input:focus {
    box-shadow: none;
    border-color: var(--primary);
}

input::placeholder {
    color: var(--muted) !important;
}
/* Add Button */
#todo_add {
    border-radius: 0 var(--radius) var(--radius) 0;
    background: var(--primary);
    border: none;
    transition: 0.3s;
}

#todo_add:hover {
    background: var(--primary-hover);
    transform: scale(0.96);
}

/* List */
#todo_list li {
    padding: 14px 10px;
    border-radius: 10px;
    transition: 0.3s;
}

#todo_list li:hover {
    background: rgba(255, 255, 255, 0.05);
}

/* Todo text */
.todo_item {
    font-size: 16px;
    font-weight: 500;
}

/* Buttons */
.btn-action {
    width: 38px;
    height: 38px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: 0.25s;
    border: none;
}

/* Edit */
.btn-primary {
    background: var(--primary);
}

.btn-primary:hover {
    background: var(--primary-hover);
}

/* Delete */
.btn-danger {
    background: var(--danger);
}

.btn-danger:hover {
    filter: brightness(1.1);
}

/* Complete */
.btn-info {
    background: var(--success);
    color: #fff;
}

.btn-info:hover {
    filter: brightness(1.1);
}

/* Icons */
.btn-action i {
    font-size: 14px;
    /* color: var(--text); */
}

/* Completed Task */
.completed {
    text-decoration: line-through;
    color: var(--muted);
    opacity: 0.7;
}

/* Scroll */
#todo_list {
    max-height: 300px;
    overflow-y: auto;
}

/* Scrollbar */
#todo_list::-webkit-scrollbar {
    width: 6px;
}

#todo_list::-webkit-scrollbar-thumb {
    background: var(--primary);
    border-radius: 10px;
    cursor: grab;
}

#todo_list button {
    cursor: pointer;
}


/* Item */
.todo-item {
    padding: 14px 12px;
    border-bottom: 1px solid var(--border);
    border-radius: 10px;
    transition: 0.3s;
}

.todo-item:hover {
    background: rgba(255, 255, 255, 0.04);
}

/* Actions container */
.actions {
    display: flex;
    gap: 8px;
}

/* Buttons base */
.btn-action {
    width: 40px;
    height: 40px;
    border-radius: 10px;
    background: rgba(255, 255, 255, 0.05);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: 0.25s;
    border: 1px solid transparent;
}

/* Icons */
.btn-action i {
    font-size: 16px;
    transition: 0.2s;
}

/* Hover base */
.btn-action:hover {
    transform: translateY(-2px) scale(1.05);
}

/* Edit */
.btn-action.edit:hover {
    background: rgba(99, 102, 241, 0.15);
    border-color: var(--primary);
}

.btn-action.edit:hover i {
    color: var(--primary);
}

/* Delete */
.btn-action.delete:hover {
    background: rgba(239, 68, 68, 0.15);
    border-color: var(--danger);
}

.btn-action.delete:hover i {
    color: var(--danger);
}

/* Complete */
.btn-action.complete:hover {
    background: rgba(34, 197, 94, 0.15);
    border-color: var(--success);
}

.btn-action.complete:hover i {
    color: var(--success);
}

/* Click effect */
.btn-action:active {
    transform: scale(0.9);
}

/* Completed state */
.completed {
    text-decoration: line-through;
    color: var(--muted);
    opacity: 0.6;
}

.completed + .actions .complete {
    background: rgba(34, 197, 94, 0.2);
}

.completed + .actions .complete i {
    color: var(--success);
}
.btn-action:hover i {
    transform: scale(1.2);
}

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

.completed_task_btn{
    background: rgba(34, 197, 94, 0.15);
    border-color: var(--success);
}
.completed_task_btn i{
    color: var(--success);
}