@import url('https://fonts.googleapis.com/css2?family=Syne:wght@400;600;700;800&family=Inter:wght@300;400;500&display=swap');

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

:root {
    --bg: #0f0f13;
    --surface: #17171d;
    --surface-2: #1e1e26;
    --accent: #7c6af5;
    --accent-glow: rgba(124, 106, 245, 0.25);
    --accent-dim: rgba(124, 106, 245, 0.12);
    --text: #e8e8f0;
    --text-muted: #5a5a72;
    --border: #252530;
    --danger: #f05e5e;
    --radius: 14px;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg);
    min-height: 100vh;
    color: var(--text);
}

main {
    position: relative;
    z-index: 1;
    width: 100%;
    max-width: 580px;
    margin: 0 auto;
    padding: 52px 20px 60px;
    display: flex;
    flex-direction: column;
    gap: 14px;
}

main::before {
    content: "My Tasks";
    font-family: 'Syne', sans-serif;
    font-size: 2.6rem;
    font-weight: 700;
    color: var(--text);
    display: block;
    margin-bottom: 10px;
    letter-spacing: -0.5px;
}

/* Filter */
.filter-container {
    display: flex;
    gap: 6px;
    background: var(--surface);
    padding: 5px;
    border-radius: var(--radius);
    border: 1px solid var(--border);
}

.filter-container button {
    flex: 1;
    padding: 9px 12px;
    border: none;
    border-radius: 10px;
    background: transparent;
    color: var(--text-muted);
    font-family: 'Inter', sans-serif;
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.filter-container button:hover {
    color: var(--text);
    background: var(--surface-2);
}

.filter-container .active-filter {
    background: var(--accent-dim);
    color: var(--accent);
    border: 1px solid rgba(124, 106, 245, 0.3);
}

/* Error */
.error {
    display: none;
    background: rgba(240, 94, 94, 0.1);
    color: var(--danger);
    padding: 10px 16px;
    border-radius: 8px;
    font-size: 0.85rem;
    font-weight: 500;
    border: 1px solid rgba(240, 94, 94, 0.25);
    animation: shake 0.3s ease;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    75% { transform: translateX(5px); }
}

/* Input Add */
.input-add {
    display: flex;
    gap: 10px;
}

.input-add .task {
    flex: 1;
    padding: 13px 18px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--surface);
    font-family: 'Inter', sans-serif;
    font-size: 0.95rem;
    color: var(--text);
    outline: none;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.input-add .task:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

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

.input-add button {
    padding: 13px 22px;
    border: none;
    border-radius: var(--radius);
    background: var(--accent);
    color: white;
    font-family: 'Syne', sans-serif;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: opacity 0.2s, transform 0.1s, box-shadow 0.2s;
    box-shadow: 0 4px 20px var(--accent-glow);
}

.input-add button:hover {
    opacity: 0.88;
    box-shadow: 0 4px 28px rgba(124, 106, 245, 0.4);
}

.input-add button:active {
    transform: scale(0.97);
}

/* Tasks List */
.tasks {
    background: var(--surface);
    border-radius: var(--radius);
    border: 1px solid var(--border);
    overflow: hidden;
}

.tasks:empty::after {
    content: "No tasks  — add one above";
    display: block;
    text-align: center;
    padding: 36px;
    color: var(--text-muted);
    font-size: 0.875rem;
}

/* Task Item */
.tasks-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 16px;
    border-bottom: 1px solid var(--border);
    transition: background 0.15s;
}

.tasks-container:last-child {
    border-bottom: none;
}

.tasks-container:hover {
    background: var(--surface-2);
}

.inner-container {
    display: flex;
    align-items: center;
    gap: 12px;
    flex: 1;
    min-width: 0;
}

input[type="checkbox"] {
    width: 18px;
    height: 18px;
    min-width: 18px;
    border-radius: 5px;
    cursor: pointer;
    accent-color: var(--accent);
    border: 2px solid var(--text-muted);
}

.tasks-container:has(.checkbox:checked) .taskInput {
    text-decoration: line-through;
    color: var(--text-muted);
}

.taskInput {
    flex: 1;
    border: none;
    background: transparent;
    font-family: 'Inter', sans-serif;
    font-size: 0.92rem;
    color: var(--text);
    outline: none;
    min-width: 0;
    padding: 4px 8px;
    border-radius: 6px;
    transition: background 0.15s;
}

.taskInput:disabled {
    background: transparent;
    color: var(--text);
    cursor: default;
}

.taskInput:not(:disabled) {
    background: var(--accent-dim);
    border: 1px solid rgba(124, 106, 245, 0.3);
    color: var(--accent);
}

.task-buttons {
    display: flex;
    gap: 4px;
    margin-left: 8px;
}

.task-buttons button {
    width: 30px;
    height: 30px;
    border: none;
    border-radius: 8px;
    background: transparent;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.15s;
}

.task-buttons .edite:hover {
    background: var(--accent-dim);
}

.task-buttons .remove:hover {
    background: rgba(240, 94, 94, 0.12);
}

img {
    width: 15px;
    height: 15px;
    opacity: 0.4;
    filter: invert(1);
}

.task-buttons button:hover img {
    opacity: 0.9;
}

input[type="checkbox"] {
    appearance: none;
    -webkit-appearance: none;

    width: 18px;
    height: 18px;
    min-width: 18px;

    border: 2px solid var(--accent);
    border-radius: 5px;

    background-color: var(--bg);
    cursor: pointer;
    position: relative;
    display: inline-block;
}
input[type="checkbox"]:checked {
    background-color: var(--accent);
}
input[type="checkbox"]:checked::after {
    content: "✔";
    position: absolute;
    color: white;
    font-size: 12px;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -55%);
}