* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: "Segoe UI", "Malgun Gothic", sans-serif;
    background: #f4f6f8;
    color: #222;
}

.container {
    max-width: 720px;
    margin: 0 auto;
    padding: 24px 16px 60px;
}

.app-header h1 {
    font-size: 24px;
    text-align: center;
    color: #2f6feb;
    margin-bottom: 20px;
}

.flash-list {
    margin-bottom: 16px;
}

.flash {
    padding: 10px 14px;
    border-radius: 6px;
    margin-bottom: 8px;
    font-size: 14px;
}

.flash-success {
    background: #e3f7e8;
    color: #1e7c3a;
    border: 1px solid #b7e5c2;
}

.flash-error {
    background: #fdeaea;
    color: #c0392b;
    border: 1px solid #f3b9b3;
}

.add-form-section {
    background: #fff;
    border-radius: 10px;
    padding: 16px;
    box-shadow: 0 1px 4px rgba(0,0,0,0.08);
    margin-bottom: 16px;
}

.add-form {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.add-form input[type="text"] {
    flex: 2 1 160px;
}

.add-form input[type="date"] {
    flex: 1 1 140px;
}

.add-form select {
    flex: 0 0 90px;
}

.add-form input,
.add-form select,
.edit-form input,
.edit-form textarea,
.edit-form select {
    padding: 8px 10px;
    border: 1px solid #d5dae0;
    border-radius: 6px;
    font-size: 14px;
}

.add-form button,
.edit-form button {
    background: #2f6feb;
    color: #fff;
    border: none;
    padding: 8px 18px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
}

.add-form button:hover,
.edit-form button:hover {
    background: #2559c7;
}

.stats-bar {
    display: flex;
    gap: 16px;
    font-size: 13px;
    color: #556070;
    margin-bottom: 10px;
    padding: 0 4px;
}

.filter-bar {
    display: flex;
    gap: 8px;
    margin-bottom: 16px;
}

.filter-bar a {
    padding: 6px 14px;
    border-radius: 20px;
    background: #fff;
    border: 1px solid #d5dae0;
    color: #556070;
    text-decoration: none;
    font-size: 13px;
}

.filter-bar a.active {
    background: #2f6feb;
    border-color: #2f6feb;
    color: #fff;
}

.todo-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.todo-item {
    background: #fff;
    border-radius: 10px;
    padding: 14px;
    box-shadow: 0 1px 4px rgba(0,0,0,0.06);
    display: flex;
    align-items: flex-start;
    gap: 12px;
    border-left: 4px solid #d5dae0;
}

.todo-item.priority-high {
    border-left-color: #e0554f;
}

.todo-item.priority-medium {
    border-left-color: #e3a83b;
}

.todo-item.priority-low {
    border-left-color: #4ba36b;
}

.todo-item.done {
    opacity: 0.55;
}

.todo-item.done .todo-title {
    text-decoration: line-through;
}

.checkbox-btn {
    width: 26px;
    height: 26px;
    border-radius: 50%;
    border: 2px solid #c3cad3;
    background: #fff;
    color: #2f6feb;
    font-weight: bold;
    cursor: pointer;
    flex-shrink: 0;
}

.todo-body {
    flex: 1;
    min-width: 0;
}

.todo-title-row {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.todo-title {
    font-size: 15px;
    font-weight: 600;
}

.todo-description {
    font-size: 13px;
    color: #667080;
    margin-top: 4px;
}

.badge {
    font-size: 11px;
    padding: 2px 8px;
    border-radius: 20px;
    background: #eef1f4;
    color: #556070;
}

.badge-high {
    background: #fdeaea;
    color: #c0392b;
}

.badge-medium {
    background: #fdf3de;
    color: #a6710b;
}

.badge-low {
    background: #e3f7e8;
    color: #1e7c3a;
}

.badge-due.overdue {
    background: #fdeaea;
    color: #c0392b;
}

.todo-actions {
    display: flex;
    gap: 6px;
    flex-shrink: 0;
}

.btn-edit, .btn-delete, .btn-cancel {
    font-size: 12px;
    padding: 6px 10px;
    border-radius: 6px;
    border: 1px solid #d5dae0;
    background: #fff;
    color: #556070;
    text-decoration: none;
    cursor: pointer;
}

.btn-delete {
    color: #c0392b;
}

.empty-state {
    text-align: center;
    padding: 40px 0;
    color: #98a2ae;
    background: #fff;
    border-radius: 10px;
}

.edit-form-section {
    background: #fff;
    border-radius: 10px;
    padding: 20px;
    box-shadow: 0 1px 4px rgba(0,0,0,0.08);
}

.edit-form {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.edit-form label {
    font-size: 13px;
    color: #556070;
    margin-top: 10px;
}

.edit-actions {
    display: flex;
    gap: 8px;
    margin-top: 18px;
}